Multistage centrifugal pump with filtering function

Abstract

The utility model provides a kind of multi-stage centrifugal pump with filtering function, including pump base and outer screw connecting pipe, motor and multistage centrifugal pump body are installed in pump base upper end by multiple bolts, outer screw water inlet pipe is welded in multistage centrifugal pump body front end left side, first fixed sleeve ring is fixedly sheathed in outer screw water inlet pipe outer rear end, this design solves the original chemical centrifugal pump with filtering function, cup type filter screen is limited fixed using a large number of bolts, when cleaning or replacing cup type filter screen, it needs to be assisted by external wrench to loosen and disassemble multiple bolts one by one, this operation is more complicated, influence subsequent centrifugal pump operation problem, the utility model uses modularization double cup type filter screen structure, cooperate with magnetic attraction positioning, thread connection and rubber seal, after long time filtering effect in one of cup type filter screen, it is quickly replaced, to greatly reduce the influence on subsequent centrifugal pump operation.

Description

Technical Field

[0001] This utility model is a multi-stage centrifugal pump with filtration function, belonging to the field of centrifugal pump technology. Background Technology

[0002] Multistage centrifugal pumps are widely used in high-rise building water supply, boiler feedwater, mine drainage, and industrial process pressurization due to their ability to provide high head. These pumps have high requirements for the cleanliness of the medium. Solid particles and impurities in the water can severely wear down precision components such as impellers, guide vanes, and sealing rings inside the pump, leading to decreased pump efficiency, increased energy consumption, and even equipment damage. Therefore, in existing technologies, multistage centrifugal pumps often have a filter screen installed at the inlet.

[0003] Chinese patent CN222376824U proposes a chemical centrifugal pump with filtration function. By filtering the water before pumping, impurities are prevented from entering the pump, thus protecting the pump blades and other key components from damage, improving the pump's operating efficiency and reliability, and extending its service life. However, in this chemical centrifugal pump with filtration function, the cup-shaped filter screen is fixed by a large number of bolts. When cleaning or replacing the cup-shaped filter screen, it is necessary to loosen and disassemble multiple bolts one by one with an external wrench. This operation is cumbersome and affects the subsequent operation of the centrifugal pump. There is an urgent need for a multi-stage centrifugal pump with filtration function to solve the above-mentioned problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a multi-stage centrifugal pump with filtration function to solve the problems mentioned in the background. This invention adopts a modular double-cup filter structure, combined with magnetic positioning, threaded connection and rubber seal, which allows for quick replacement of one of the cup-shaped filters after prolonged filtration, thereby greatly reducing the impact on subsequent centrifugal pump operation.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: A multi-stage centrifugal pump with filtration function includes a pump base and an external helical connecting pipe. A motor and a multi-stage centrifugal pump body are mounted on the upper end of the pump base via multiple bolts. An external helical inlet pipe is welded to the left front end of the multi-stage centrifugal pump body. A first fixing collar is fixedly fitted around the rear end of the external helical inlet pipe. A first internal helical cylinder is threaded onto the front end of the first fixing collar. The external helical connecting pipe is located in front of the external helical inlet pipe. A second fixing collar is fixedly fitted around the front end of the external helical connecting pipe. A second internal helical cylinder is threaded onto the rear end of the external helical connecting pipe. Both the first and second inner cylinders are fixed with magnetic positioning rings. Both the first and second inner cylinders are filled with waterproof rubber rings. The rear edge of the first inner cylinder and the front edge of the second inner cylinder are fixed with waterproof rubber rings. The upper end of the pump base is provided with a stroke groove. A hollow metal tube is horizontally welded in the stroke groove. A sliding seat is slidably fitted on the outside of the hollow metal tube. Two metal support plates are longitudinally welded to the upper end of the sliding seat. Welding rings are welded to the upper ends of the two metal support plates. Externally threaded metal tubes are welded inside the two welding rings. Stepped rings are welded to the front ends of the two externally threaded metal tubes. Cup-shaped filter screens are inserted into the two stepped rings.

[0006] Furthermore, an external rod is welded to the upper end of the second fixing collar and the first fixing collar.

[0007] Furthermore, the externally threaded metal tube on the left is located between the externally threaded water inlet pipe and the externally threaded connecting pipe, and the front and rear ends of the externally threaded metal tube on the left are respectively magnetically attracted to two magnetic positioning rings.

[0008] Furthermore, the first inner screw is threaded onto the rear end of the left external threaded metal tube, and the second inner screw is threaded onto the front end of the left external threaded metal tube, with the front end of the first inner screw and the rear end of the second inner screw respectively abutting against two waterproof rubber rings.

[0009] Furthermore, the front and rear ends of the welding ring on the left side abut against the two waterproof rubber rings respectively.

[0010] Furthermore, the motor is connected to the multi-stage centrifugal pump body via a drive, and a liquid outlet pipe is installed on the upper right side of the multi-stage centrifugal pump body.

[0011] The beneficial effects of this utility model are as follows: This utility model provides a multi-stage centrifugal pump with filtration function. Because it incorporates an external threaded inlet pipe, a magnetic positioning ring, a first fixing collar, a first internal threaded cylinder, a waterproof rubber ring, a waterproof rubber ring, an external connecting rod, a second fixing collar, an external threaded connecting pipe, a second internal threaded cylinder, a hollow metal tube, a sliding seat, a metal support plate, a welding ring, an external threaded metal tube, and a stepped ring, its structure is reasonable. It adopts a modular double-cup filter structure, and with the addition of magnetic positioning, threaded connection, and rubber sealing, it can quickly replace one of the cup-shaped filters after prolonged filtration, thus greatly reducing the impact on subsequent centrifugal pump operation. It is simple to operate and highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the structure of a multi-stage centrifugal pump with filtration function according to the present invention;

[0014] Figure 2 This is a schematic diagram of the uninstalled structure of a multi-stage centrifugal pump with filtration function according to this utility model.

[0015] Figure 3 This is an enlarged schematic diagram of the external spiral inlet pipe of a multi-stage centrifugal pump with filtration function according to this utility model;

[0016] Figure 4 This is a schematic diagram of the first and second inner screw barrels of a multi-stage centrifugal pump with filtration function according to the present invention.

[0017] Figure 5 This is a schematic diagram of the cup-shaped filter screen position structure of a multi-stage centrifugal pump with filtration function according to this utility model.

[0018] In the diagram: 1-Pump base, 2-Motor, 3-Multi-stage centrifugal pump body, 4-External threaded inlet pipe, 5-Magnetic positioning ring, 6-First fixing collar, 7-First internal threaded cylinder, 8-Waterproof rubber ring, 9-Waterproof rubber ring, 10-External connecting rod, 11-Second fixing collar, 12-External threaded connecting pipe, 13-Second internal threaded cylinder, 14-Stroke groove, 15-Hollow metal tube, 16-Sliding seat, 17-Metal support plate, 18-Welding ring, 19-External threaded metal tube, 20-Stepped ring, 21-Cup-shaped filter screen. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0020] Please see Figures 1-5 This utility model provides a technical solution: a multi-stage centrifugal pump with filtration function, including a pump base 1 and an external threaded connecting pipe 12. A motor 2 and a multi-stage centrifugal pump body 3 are mounted on the upper end of the pump base 1 via multiple bolts. An external threaded inlet pipe 4 is welded to the left front end of the multi-stage centrifugal pump body 3. A first fixing collar 6 is fixedly fitted to the rear end of the external threaded inlet pipe 4. A first internal threaded cylinder 7 is threadedly fitted to the front end of the first fixing collar 6. The external threaded connecting pipe 12 is located in front of the external threaded inlet pipe 4. A second fixing collar 11 is fixedly fitted to the front end of the external threaded connecting pipe 12. A second internal threaded cylinder 13 is threadedly fitted to the rear end of the external threaded connecting pipe 12. Magnetic positioning rings 5 ​​are fixed to the front end of the external threaded inlet pipe 4 and the rear end of the second internal threaded cylinder 13. Waterproof rubber rings 8 are filled inside both the first internal threaded cylinder 7 and the second internal threaded cylinder 13. The rear edge of the first internal threaded cylinder 7 and the second internal threaded cylinder 13 are connected to the first internal threaded cylinder 13. Waterproof rubber rings 9 are fixed to the front edge of the two internal screw cylinders 13. A stroke groove 14 is opened at the upper end of the pump base 1. A hollow metal tube 15 is horizontally welded in the stroke groove 14. A sliding seat 16 is slidably sleeved on the outside of the hollow metal tube 15. Two metal support plates 17 are longitudinally welded to the upper end of the sliding seat 16. Welding rings 18 are welded to the upper end of the two metal support plates 17. External threaded metal tubes 19 are welded inside the two welding rings 18. Stepped rings 20 are welded to the front end of the two external threaded metal tubes 19. Cup-shaped filter screens 21 are inserted into the two stepped rings 20. This design solves the problem that in the original chemical centrifugal pump with filtration function, the cup-shaped filter screen is fixed by a large number of bolts. When cleaning or replacing the cup-shaped filter screen, it is necessary to use an external wrench to loosen and disassemble multiple bolts one by one. This operation is cumbersome and affects the subsequent operation of the centrifugal pump.

[0021] As the first embodiment of this utility model: An external rod 10 is welded to the upper end of the second fixing collar 11 and the first fixing collar 6. The added external rod 10 facilitates the fixing of the second fixing collar 11 and the first fixing collar 6, allowing for the installation of the external threaded connecting pipe 12. This ensures the relative stability of the two fixed parts, forming the static frame of the entire filtration mechanism. The left-side external threaded metal pipe 19 is located between the external threaded water inlet pipe 4 and the external threaded connecting pipe 12. The front and rear ends of the left-side external threaded metal pipe 19 are magnetically attracted to two magnetic positioning rings 5, respectively. By magnetically attracting the front and rear ends of the added left-side external threaded metal pipe 19 to the two magnetic positioning rings 5, the positioning and installation of the external threaded metal pipe 19 can be achieved.

[0022] The first internal screw cylinder 7 is threaded onto the rear end of the left external threaded metal tube 19, and the second internal screw cylinder 13 is threaded onto the front end of the left external threaded metal tube 19. The front end of the first internal screw cylinder 7 and the rear end of the second internal screw cylinder 13 abut against two waterproof rubber rings 8, respectively. The front and rear ends of the left welding ring 18 abut against two waterproof rubber rings 9, respectively. By adding the front end of the first internal screw cylinder 7 and the rear end of the second internal screw cylinder 13 abutting against the two waterproof rubber rings 8, and the front and rear ends of the left welding ring 18 abutting against the two waterproof rubber rings 9, the first internal screw cylinder 7 and the second internal screw cylinder 13 can be forced to seal and shield the installed left external threaded metal tube 19. These components together constitute a reliable sealing and connection interface. The motor 2 is driven by the multi-stage centrifugal pump body 3, and a liquid outlet pipe is installed on the upper right side of the multi-stage centrifugal pump body 3.

[0023] As a second embodiment of this utility model: During normal operation, push the sliding seat 16 to the left to move the left-side external threaded metal tube 19 between the external threaded water inlet pipe 4 and the external threaded connecting pipe 12. At this time, relying on the magnetic force of the two magnetic positioning rings 5, the front and rear ends of the external threaded metal tube 19 can be quickly and initially attracted and positioned (if the position is inaccurate, it can be manually fine-tuned). Subsequently, screw the first internal threaded cylinder 7 on the rear end of the external threaded metal tube 19 and screw the second internal threaded cylinder 13 on its front end. As the threads are tightened, the first internal threaded cylinder 7 and the second internal threaded cylinder 13 will respectively press the waterproof rubber ring 8 inside, making it tightly adhere to the outer wall of the external threaded metal tube 19, forming a radial seal; at the same time, the two waterproof rubber rings 9 will respectively press the front and rear end faces of the left-side welding ring 18, forming an end face seal, and the left-side external threaded metal tube 19 will also be completely covered. A completely sealed water flow channel is formed around the left-side cup-shaped filter screen 21, and the liquid must pass through the cup-shaped filter screen 21 before it can enter the multi-stage centrifugal pump body 3 through the external threaded water inlet pipe 4;

[0024] When the cup-shaped filter 21 on the left becomes clogged due to prolonged use, causing a drop in pump inlet pressure and reduced flow, the operator stops the motor 2 and cleans or replaces the spare cup-shaped filter 21 on the right with a new one. When switching is required, the first inner screw 7 and the second inner screw 13 are turned in reverse until the external threaded metal tube 19 on the left is fully exposed. The sliding seat 16 is then pushed to the left, forcing the external threaded metal tube 19 on the left to separate from the two magnetic positioning rings 5. When the external threaded metal tube 19 on the right is attracted between the two magnetic positioning rings 5, the first inner screw 7 and the second inner screw 13 are quickly tightened to establish a new sealed filter channel. Due to the dual-filter module design, this switching process is extremely rapid, minimizing system downtime. After the right-side filter module is put into operation, the clogged module on the left is separated from the main flow. At this time, the operator can easily pull out the cup-shaped filter 21 inside the external threaded metal tube 19 on the left for cleaning or replacement. The entire maintenance process does not require disassembling any bolts; only the two inner screws need to be turned by hand, saving time and effort. The cleaned and maintained filter module is kept on the side as a new backup module, ready to be put into operation quickly when needed next.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-stage centrifugal pump with filtration function, comprising a pump base (1) and an external threaded connecting pipe (12), characterized in that: The upper end of the pump base (1) is equipped with a motor (2) and a multi-stage centrifugal pump body (3) by multiple bolts. An external spiral water inlet pipe (4) is welded to the left front end of the multi-stage centrifugal pump body (3). A first fixing collar (6) is fixedly sleeved on the rear end of the external spiral water inlet pipe (4). A first internal spiral cylinder (7) is threadedly sleeved on the front end of the first fixing collar (6). An external spiral connecting pipe (12) is located in front of the external spiral water inlet pipe (4). A second fixing collar (11) is fixedly sleeved on the front end of the external spiral connecting pipe (12). A second internal spiral cylinder (13) is threadedly sleeved on the rear end of the external spiral connecting pipe (12). Magnet positioning rings (5) are fixed to the front end of the external spiral water inlet pipe (4) and the rear end of the second internal spiral cylinder (13). The first internal spiral cylinder (7) and the second internal spiral cylinder (13) are also fixed to each other. The pump base (1) is filled with waterproof rubber rings (8). Waterproof rubber rings (9) are fixed to the rear edge of the first inner screw (7) and the front edge of the second inner screw (13). A stroke groove (14) is opened at the upper end of the pump base (1). A hollow metal tube (15) is horizontally welded in the stroke groove (14). A sliding seat (16) is slidably sleeved on the outside of the hollow metal tube (15). Two metal support plates (17) are longitudinally welded to the upper end of the sliding seat (16). Welding rings (18) are welded to the upper ends of the two metal support plates (17). External thread metal tubes (19) are welded inside the two welding rings (18). Step rings (20) are welded to the front ends of the two external thread metal tubes (19). Cup-shaped filter screens (21) are inserted into the two step rings (20).

2. A multi-stage centrifugal pump with filtration function according to claim 1, characterized in that: The second fixing collar (11) and the upper end of the first fixing collar (6) are welded with an external rod (10).

3. A multi-stage centrifugal pump with filtration function according to claim 1, characterized in that: The externally threaded metal tube (19) on the left is located between the externally threaded water inlet tube (4) and the externally threaded connecting tube (12), and the front and rear ends of the externally threaded metal tube (19) on the left are respectively magnetically attracted to two magnetic positioning rings (5).

4. A multi-stage centrifugal pump with filtration function according to claim 1, characterized in that: The first inner screw (7) is threaded onto the rear end of the left external threaded metal tube (19), and the second inner screw (13) is threaded onto the front end of the left external threaded metal tube (19). The front end of the first inner screw (7) and the rear end of the second inner screw (13) abut against two waterproof rubber rings (8) respectively.

5. A multi-stage centrifugal pump with filtration function according to claim 1, characterized in that: The front and rear ends of the welding ring (18) on the left side abut against the two waterproof rubber rings (9) respectively.

6. A multi-stage centrifugal pump with filtration function according to claim 1, characterized in that: The motor (2) is connected to the multi-stage centrifugal pump body (3) for transmission, and the liquid outlet pipe is installed on the upper right side of the multi-stage centrifugal pump body (3).

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