Novel submerged pump balance structure

Abstract

The utility model 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, radial resultant force is effectively neutralized, 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, not only is the operation stability improved, but also the maintenance cost is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of balance structure, specifically to a kind of new type of underflow pump balance structure, which realizes the symmetrical offset of fluid pressure, reduces radial force, reduces vibration and noise, and realizes the self-balancing of axial force. BACKGROUND

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

[0003] When the existing single volute underflow pump is running, the asymmetric pressure distribution of the fluid at the outlet of the impeller will form uneven radial load in the volute, causing imbalance of the radial force. This periodic change in radial force not only exacerbates bearing wear, but also causes vibration and noise, restricting the efficient and stable operation of the pump. The pressure difference caused by the area difference between the front and rear cover plates of the impeller will form an axial thrust pointing to the suction end. Traditional solutions such as balance holes or balance discs can alleviate the problem, but have drawbacks such as leakage loss or structural complexity.

[0004] Due to the imbalance of radial force and axial force, the operating efficiency of the pump is severely affected. Traditional balancing measures such as balance 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, reducing the overall operating efficiency.

[0005] The bearing wear is exacerbated, resulting in a shortened bearing replacement cycle and increased maintenance costs. The structural complexity of traditional balancing measures makes it more difficult to maintain and repair the pump.

[0006] The existing pump type performs poorly in complex conditions such as high lift, corrosive medium, and high solid content slurry, and is prone to failure. SUMMARY

[0007] To solve the above problems, the main purpose of the utility model is to provide a new type of underflow pump balance structure that realizes the symmetrical offset of fluid pressure, reduces radial force, reduces vibration and noise, and realizes the self-balancing of axial force.

[0008] The utility model discloses a novel under -liquid pump balance structure through below described technical scheme to solve above -mentioned technical problem: a novel under -liquid pump balance structure, novel under -liquid pump balance structure includes: filter screen, pump cover, pump body, impeller, impeller nut, key, shaft, filter screen is fixed at pump import, and pump body adopts double volute pump body, and pump body and pump cover are detachably fixed together, impeller is fixed on pump shaft, and impeller is connected with the shaft through the key on pump shaft, and the back of impeller is provided with independent impeller flow channel, and double volute pump body is provided with the baffle.

[0009] In the embodiment of the utility model, the filter screen is connected with the pump cover through bolts.

[0010] In the embodiment of the utility model, the pump body is connected with the pump cover through bolts.

[0011] In the embodiment of the utility model, the impeller is fixed on the pump shaft through the locking nut.

[0012] In the embodiment of the utility model, the mesh number of the filter screen ranges from 0.2 to 1.

[0013] In the embodiment of the utility model, the independent impeller flow channel arranged on the back of the impeller has cylindrical blades, and the number of the blades ranges from 5 to 7.

[0014] In the embodiment of the utility model, the baffle arranged in the double volute pump body is integrally cast with the double volute pump body.

[0015] The utility model discloses a novel under -liquid pump balance structure and common technology compared with the following advantages:

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

[0017] The impeller back flow channel design realizes the self -balancing of axial force, does not need additional sealing structure, avoids the leakage loss and structural complication problems caused by the traditional balance hole or balance disc.

[0018] The utility model discloses a novel under -liquid pump balance structure and common technology compared with the following advantages:

[0019] The utility model discloses a novel under -liquid pump balance structure and common technology compared with the following advantages:

[0020] The double volute and the back flow channel of the impeller cooperate, so that the operation stability is improved, and the maintenance cost is remarkably reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a whole structure schematic view of the utility model.

[0022] Figure 2 It is a schematic view of the inner partition plate of the double volute pump body in the utility model.

[0023] The following is the name corresponding to the label in the utility model:

[0024] The filter screen 1, the pump cover 2, the pump body 3, the impeller 4, the impeller nut 5, the key 6, the shaft 7 and the partition plate 8. PREFERRED EMBODIMENT

[0025] The following gives the preferred embodiment of the utility model in combination with the drawings to explain the technical scheme of the utility model in detail.

[0026] Figure 1 It is a whole structure schematic view of the utility model, Figure 2 It is a schematic view of the inner partition plate of the double volute pump body in the utility model, as shown in the above figure, the utility model provides a novel submersible pump balance structure, the novel submersive pump balance structure includes: filter screen 1, pump cover 2, pump body 3, impeller 4, impeller nut 5, key 6, shaft 7;The filter screen 1 is fixed at the pump inlet, the pump body 3 adopts the double volute pump body, the pump body 3 and the pump cover 2 are detachably fixed together;The impeller 4 is fixed on the pump shaft 7, the impeller 4 is connected with the shaft 7 through the key 6 on the pump shaft 7, and the back of the impeller 4 is provided with an independent impeller flow channel;The double volute pump body is provided with a partition plate 8.

[0027] In the specific implementation process of the utility model, the filter screen 1 and the pump cover 2 in the utility model are connected through bolts, the pump body 3 is connected with the pump cover 2 through bolts, and the impeller 4 is fixed on the pump shaft 7 through the locking nut 5.

[0028] The mesh number of the filter screen 1 ranges from 0.2 to 1. The independent impeller flow channel arranged on the back of the impeller 4 is provided with cylindrical blades, and the number of blades is selected to be 5-7 according to different specific speed. The above parameters can be replaced by other values or ranges according to specific requirements.

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

[0030] Traditional submersible pumps usually balance axial force by balance hole or back blade, but these methods have leakage loss or structural complication problems. The utility model discloses a back flow passage design of impeller, without additional sealing structure, axial force self-balancing can be realized.

[0031] In the prior art, the submersible pump has poor performance under complex working conditions such as high lift, corrosive medium and slurry with high solid content. The utility model discloses the synergistic effect of double volute and impeller back flow passage, not only improves the operation stability, but also significantly reduces the maintenance cost. In order to illustrate the synergistic effect of double volute and impeller back flow passage, the utility model gives the following experimental data, table 1 and table 2.

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

[0033]

[0034] Table 2

[0035]

[0036]

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

[0038] In the prior art, the structure design of the submersible pump is relatively complex, and the maintenance and repair are difficult. The utility model optimizes the internal structure of the pump body, simplifies the overall design, and improves the convenience of maintenance.

[0039] The utility model is especially suitable for complex working conditions such as high lift, corrosive medium and slurry with high solid content, and solves the problem of poor performance of traditional submersible pumps under complex working conditions.

[0040] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made without departing from the spirit and scope of the utility model. These changes and improvements all fall within the scope of the claimed utility model, and the scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A novel balance structure for a submersible pump, characterized by: The new balance structure of the submerged pump 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 is a double volute pump body; the pump body and the pump cover are detachably fixed together; the impeller is fixed on the pump shaft and connected with the shaft through the key on the pump shaft; an independent impeller flow channel is arranged on the back surface of the impeller; and a partition plate is arranged in the double volute pump body.

2. The novel balance structure for submersible pump according to claim 1, wherein: The filter screen and the pump cover are connected through bolts.

3. The novel balance construction for submersible pump as claimed in claim 1, wherein: The pump body is connected with the pump cover through bolts.

4. The novel balance construction for submersible pump as claimed in claim 1, wherein: The impeller is fixed on the pump shaft through a locking nut.

5. The novel balance construction for submersible pump as claimed in claim 1, wherein: The mesh number of the filter screen ranges from 0.2 to 1.

6. The novel balance construction for submersible pump as claimed in claim 1, wherein: The independent impeller flow channel arranged on the back surface of the impeller has cylindrical blades, and the number of the blades ranges from 5 to 7.

7. The novel balance construction for submersible pump as claimed in claim 1, wherein: The partition plate arranged in the double volute pump body is integrally cast with the double volute pump body.

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