Corrosion-resistant multi-stage centrifugal pump

Abstract

The invention belongs to the technical field of centrifugal pumps, and discloses a corrosion-resistant multi-stage centrifugal pump which comprises a supporting body, a motor is arranged at the top of the supporting body, an output shaft of the motor is connected with a connecting shaft, an impeller is arranged on the connecting shaft, and a middle pump body located on the outer side of the impeller is arranged on the inner wall of the supporting body. An oil seal connected to the connecting shaft in a sleeving mode is arranged in the supporting body. The oil seal and the hydro-extracting device are arranged, the motor is started, the impellers and the hydro-extracting device are driven to rotate through the connecting shaft, then the pump body enables liquid to smoothly pass through all stages of impellers, then the liquid is guided to flow to a pump outlet, meanwhile, the liquid is blocked in the pump body cavity through the oil seal, the liquid is prevented from leaking outwards along the connecting shaft, and the liquid is prevented from corroding equipment; and the water thrower moves along with the connecting shaft, so that media around the oil seal can be effectively thrown away, the oil seal is protected from being eroded, the service life of the water pump is effectively prolonged, and the reliability of the water pump is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of centrifugal pump technology, specifically a corrosion-resistant multistage centrifugal pump. Background Technology

[0002] Centrifugal pumps are important equipment widely used in industries, construction, and agriculture. When a multistage centrifugal pump is in use, the motor is started, which drives the connecting shaft and impeller to give the liquid kinetic energy. In the pump body, the kinetic energy of the liquid is partially converted into static pressure energy, so that the liquid has enough energy to overcome the pipeline resistance and be transported to a high place or a long distance.

[0003] In existing centrifugal pumps, O-rings are typically installed inside to prevent liquid from entering the pump through the gap between the connecting shaft and the housing, thus avoiding damage to the equipment. However, after prolonged use, the O-rings age, and the vibration of the centrifugal pump causes friction between the O-rings and other components, affecting the sealing effect and leading to liquid erosion inside the equipment. This reduces the service life and reliability of the centrifugal pump, thus requiring improvement. Summary of the Invention

[0004] To address the problems mentioned in the background section, the present invention provides a corrosion-resistant multistage centrifugal pump.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a corrosion-resistant multistage centrifugal pump, comprising a support body, a motor mounted on the top of the support body, a connecting shaft connected to the output shaft of the motor, an impeller mounted on the connecting shaft, a middle pump body located outside the impeller mounted on the inner wall of the support body, an oil seal sleeved on the connecting shaft inside the support body, the inner side of the oil seal being movably connected to the outer surface of the connecting shaft, and a water-throwing device located outside the oil seal mounted on the connecting shaft.

[0006] Preferably, a filter screen is provided at the bottom of the support body, and the bottom of the connecting shaft extends into the inner cavity of the filter screen.

[0007] Preferably, a connecting end cover is provided on the outside of the motor, and the bottom of the connecting end cover is connected to the top of the support.

[0008] Preferably, multiple impellers are provided, and all of the multiple impellers are made of titanium alloy.

[0009] Preferably, three oil seals are provided, and all three oil seals are made of fluororubber.

[0010] Preferably, a water outlet pipe is provided on the outer side of the support body, and a flow channel is provided inside the pump body.

[0011] Preferably, a locking block is provided at the top of the connecting shaft, the inner side of the locking block is movably engaged with the motor output shaft and the outer surface of the connecting shaft, and a bolt is provided on the outer side of the locking block.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] This invention is equipped with an oil seal and a water-throwing device. When the motor is started, the impeller and water-throwing device are rotated through the connecting shaft. This allows the liquid to flow smoothly through each stage of the impeller in the pump body, and then guides the liquid to the pump outlet. At the same time, the oil seal isolates the liquid in the pump body cavity, preventing the liquid from leaking outward along the connecting shaft and avoiding liquid corrosion of the equipment. The water-throwing device moves with the connecting shaft and can effectively throw away the medium around the oil seal, protecting the oil seal from erosion and corrosion, thus effectively improving the service life and reliability of the water pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0016] Figure 3 This is a cross-sectional structural schematic diagram of the filter screen of the present invention;

[0017] Figure 4 This is a cross-sectional structural diagram of the support structure of the present invention.

[0018] In the diagram: 1. Support body; 2. Motor; 3. Connecting shaft; 4. Impeller; 5. Central pump body; 6. Filter screen; 7. Oil seal; 8. Water separator; 9. Connecting end cover. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1

[0021] like Figures 1 to 4 As shown, this is the first embodiment of the present invention, which provides a corrosion-resistant multi-stage centrifugal pump, including a support body 1, a motor 2 is provided on the top of the support body 1, the output shaft of the motor 2 is connected to a connecting shaft 3, an impeller 4 is provided on the connecting shaft 3, a middle pump body 5 is provided on the inner wall of the support body 1 located outside the impeller 4, an oil seal 7 is provided inside the support body 1 and sleeved on the connecting shaft 3, the inner side of the oil seal 7 is movably connected to the outer surface of the connecting shaft 3, and a water slinger 8 is provided on the connecting shaft 3 located outside the oil seal 7;

[0022] By starting the motor 2, the connecting shaft 3, impeller 4, and water-throwing device 8 are driven to rotate. The mechanical energy generated by the motor 2 is then transferred to the liquid through the impeller 4. The liquid is then smoothly guided through each stage of the impeller 4 via the pump body 5 and directed to the pump outlet. When the liquid enters the centrifugal pump cavity, it is blocked by the oil seal 7 located on the outside of the connecting shaft 3, preventing the liquid from entering the motor 2 and avoiding corrosion of the internal components of the motor 2. At the same time, by rotating the water-throwing device 8, the liquid outside the oil seal 7 is thrown away, preventing liquid residue on the oil seal 7 and protecting it from corrosion. This effectively improves the service life and reliability of the centrifugal pump during use.

[0023] Example 2

[0024] like Figure 2 As shown, this embodiment includes the features of embodiment 1. The distinguishing technical feature is that a filter screen 6 is provided at the bottom of the support body 1, and the bottom of the connecting shaft 3 extends into the inner cavity of the filter screen 6.

[0025] When the centrifugal pump is in use, the motor 2 is started to drive the impeller 4 to draw in external liquid. When the liquid enters the pump body, it passes through the filter screen 6 to filter impurities in the liquid, preventing solid impurities from entering the pump body and causing wear on the surface of the impeller 4, which would disrupt the dynamic balance of the impeller 4 and affect the performance and service life of the pump.

[0026] Among them, a connecting end cover 9 is provided on the outside of the motor 2, and the bottom of the connecting end cover 9 is connected to the top of the support body 1;

[0027] When the centrifugal pump is in use, the motor 2 is protected by the connecting end cover 9 to prevent the motor 2 from being damaged by collision during use, thereby extending the service life of the centrifugal pump.

[0028] Example 3

[0029] like Figures 2 to 4 As shown, this embodiment includes the features of embodiment 1, the distinguishing technical feature being that multiple impellers 4 are provided, and all multiple impellers 4 are made of titanium alloy.

[0030] By connecting multiple impellers 4 in series, the liquid flows through each impeller 4 sequentially. Each time it passes through an impeller 4, the centrifugal force generated by the high-speed rotation of the impeller 4 imparts energy to the liquid, increasing its pressure and achieving a higher outlet pressure. This easily handles long-distance transportation or tasks such as supplying water or oil to high places. The liquid can be transported to heights of hundreds or even thousands of meters to meet the needs of users. Furthermore, because the impeller 4 is made of titanium alloy, it has excellent corrosion resistance, preventing corrosion caused by long-term immersion in the liquid and greatly extending its service life, thus reducing downtime costs caused by frequent replacements.

[0031] Among them, there are three oil seals 7, and all three oil seals 7 are made of fluororubber;

[0032] Three oil seals 7 are installed inside the support body 1. The three oil seals 7 prevent liquid from corroding the inside of the centrifugal pump and causing damage to the components. At the same time, the three oil seals 7 are all made of fluororubber, which gives the oil seals 7 good corrosion resistance and prevents them from being corroded, swollen and softened, thereby maintaining good sealing performance and ensuring that the liquid inside the pump does not leak and that external impurities are difficult to enter.

[0033] Among them, the support body 1 is provided with a water outlet pipe on the outside and the pump body 5 is provided with a flow channel inside.

[0034] When the motor 2 is started, the connecting shaft 3 drives the impeller 4 to rotate. Then the impeller 4 draws liquid into the middle pump body 5. At the same time, the impeller 4 imparts kinetic energy to the liquid. The high-speed liquid is thrown out and enters the middle flow channel of the middle pump body 5. The liquid flow rate decreases and the kinetic energy is gradually converted into static pressure energy. The middle pump body 5 undertakes the energy conversion process started by the impeller 4, so that the liquid pressure is increased to a level sufficient to overcome the pipeline resistance. The liquid is then transported to the target location through the outlet pipe.

[0035] Among them, the top of the connecting shaft 3 is provided with a locking block, the inner side of the locking block is movably engaged with the output shaft of the motor 2 and the outer surface of the connecting shaft 3, and the outer side of the locking block is provided with bolts;

[0036] The output shaft of motor 2 is connected to the connecting shaft 3 by means of bolts and clips. By releasing the bolts that fix motor 2 and connecting shaft 3, it is easy to remove the entire connecting shaft 3 from the inner cavity of support body 1, which facilitates maintenance of the components connected to the end of connecting shaft 3.

[0037] Working principle and usage process of this invention:

[0038] First, when the operator uses the centrifugal pump, the bottom of the centrifugal pump is placed in the liquid, and then the motor 2 is started. The operation of the motor 2 drives the connecting shaft 3, impeller 4 and water slinger 8 to rotate. Then, multiple impellers 4 sequentially increase the pressure of the liquid, and then the pressurized liquid is discharged through the outlet pipe along the pump body 5. When the centrifugal pump is in use, the oil seal 7 prevents the liquid inside the pump from leaking out along the connecting shaft 3, avoiding liquid corrosion of the equipment. At the same time, the rotating water slinger 8 shakes off the liquid attached to the oil seal 7, preventing it from adhering to the oil seal 7 and causing corrosion. Thus, the oil seal 7 and water slinger 8 effectively improve the service life and reliability of the centrifugal pump.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant multistage centrifugal pump, comprising a support body (1), characterized in that: The support body (1) is equipped with a motor (2) at the top. The output shaft of the motor (2) is connected to a connecting shaft (3). An impeller (4) is provided on the connecting shaft (3). A middle pump body (5) located outside the impeller (4) is provided on the inner wall of the support body (1). An oil seal (7) is provided inside the support body (1) and sleeved on the connecting shaft (3). The inner side of the oil seal (7) is movably connected to the outer surface of the connecting shaft (3). A water-spinning device (8) located outside the oil seal (7) is provided on the connecting shaft (3).

2. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: The bottom of the support (1) is provided with a filter screen (6), and the bottom of the connecting shaft (3) extends into the inner cavity of the filter screen (6).

3. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: The motor (2) is provided with a connecting end cover (9) on the outside, and the bottom of the connecting end cover (9) is connected to the top of the support (1).

4. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: Multiple impellers (4) are provided, and all of the multiple impellers (4) are made of titanium alloy.

5. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: There are three oil seals (7), and all three oil seals (7) are made of fluororubber.

6. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: The support body (1) is provided with a water outlet pipe on its outer side, and the pump body (5) is provided with a flow channel inside.

7. The corrosion-resistant multistage centrifugal pump according to claim 1, characterized in that: The top of the connecting shaft (3) is provided with a locking block, the inner side of which is movably engaged with the output shaft of the motor (2) and the outer surface of the connecting shaft (3), and the outer side of the locking block is provided with bolts.

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