A submersible pump for conveying a medium containing solid particles

Abstract

The utility model discloses a submersible pump for conveying a medium containing solid particles, and relates to the technical field of submersible pumps. The utility model comprises a pump body and a pump cover, wherein a shaft is installed through the center of the pump cover, the shaft penetrates into the inner cavity of the pump body and is installed with an impeller and an impeller nut, a baffle plate and a sliding bearing are also sleeved on the shaft, a skeleton oil seal and a spring retaining ring for a hole are installed on the outer wall circumference of the sliding bearing and are fitted with the inner wall of the pump cover, a gap exists between the sliding bearing and the inner wall of the pump cover, the left and right ends of the pump cover are respectively connected with a first external flushing pipeline and a second external flushing pipeline, and an impeller balancing hole is opened on the impeller; the structure of the application is reliable, and the sliding bearing is protected from particle infiltration through multiple measures, and is suitable for pumping a medium containing particle impurities, and at the same time reduces the probability of repairing the pump due to damage to the sliding bearing. Due to the reliable structural design, there is no need to select special materials, and ordinary materials can be selected, thereby reducing the manufacturing cost of the pump and extending the service life of the pump.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible pumps, in particular to a submersible pump used for conveying a medium containing solid particles. Background Art

[0002] A submersible pump is a vertical pump that immerses the impeller, pump body and other flow-passing parts in the medium. It occupies a small area and does not need to be primed when starting. It is widely used in sewage treatment and other fields. At present, most submersible pumps are structurally supported by sliding bearings. When conveying a medium containing solid particles, even if clean liquid is introduced from the outside as a flushing liquid to provide cooling and lubrication for the sliding bearings, due to the structural design defects of the current pumps, particles will still enter the sliding bearings, damage the sliding bearings, cause the pump to not work properly, shorten the service life of the pump, and increase maintenance costs.

[0003] The prior art is to provide a balancing hole on the wall of the rear cavity of the pump body to connect the cavity with the external space. The medium particles are discharged from the balancing hole. First, when the filler is worn, the particles will penetrate into the sliding bearing and damage the sliding bearing. Second, the balancing hole cannot completely discharge the particles. Third, when the balancing hole is blocked, the particles will directly penetrate into the filler and the sliding bearing. Therefore, it has a great defect. Therefore, a submersible pump for conveying a medium containing solid particles is proposed. Utility Model Content

[0004] In order to solve the above problems, that is, to solve the problems raised by the above background technology, the utility model proposes a submersible pump for conveying a medium containing solid particles, which includes a pump body and a pump cover that match each other, a shaft is installed through the center of the pump cover, the shaft penetrates into the inner cavity of the pump body and is fixedly installed with an impeller and an impeller nut, a baffle is also sleeved on the shaft and is located between the pump cover and the impeller, a sliding bearing is sleeved on the shaft and is located on the inner side of the pump cover, a skeleton oil seal and a spring retaining ring for holes are installed on the circumference of the outer wall of the sliding bearing and fit with the inner wall of the pump cover, a gap is provided between the sliding bearing and the inner wall of the pump cover, and a first external flushing pipeline and a second external flushing pipeline are connected to the left and right ends of the pump cover respectively, the first external flushing pipeline penetrates the pump cover and is connected with the gap, the second external flushing pipeline penetrates the pump cover and enters the inner side of the pump cover, the outlet end of the second external flushing pipeline is located in the gap between the baffle and the spring retaining ring for holes, a drainage hole is provided on the pump cover, and an impeller balancing hole is provided on the impeller.

[0005] The utility model is further configured as follows: the gap area between the baffle plate and the pump cover is larger than the outlet hole area of ​​the second external flushing pipeline.

[0006] The utility model is further configured as follows: the outer diameter of the baffle plate is larger than the outer hole of the impeller balancing hole.

[0007] The utility model is further configured as follows: the impeller can be optionally open, closed or semi-open.

[0008] The beneficial technical effects of the utility model are as follows: the application does not require a large number of mechanical seal parts, and can also realize the flushing of mechanical seals and the cooling of rolling bearings when the medium temperature is high, reducing the manufacturing and operation and maintenance costs of the product; the application has a reliable structure, and protects the sliding bearings from the infiltration of particles through multiple measures, which is suitable for pumping media containing particulate impurities, while reducing the probability of repairing the pump due to damage to the sliding bearings. It is economical and reasonable, and due to the reliable structural design, there is no need to select special materials, but ordinary materials can be selected, which reduces the manufacturing cost of the pump and prolongs the service life of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Shown is a schematic diagram of the structure of the utility model.

[0010] Figure numerals: 1. pump body, 2. pump cover, 3. shaft, 4. impeller, 5. impeller nut, 6. baffle plate, 7. sliding bearing, 8. skeleton oil seal, 9. spring retaining ring for hole, 10. first external flushing pipeline, 11. second external flushing pipeline, 12. drain hole, 13. impeller balancing hole. DETAILED DESCRIPTION

[0011] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0012] The utility model proposes a submersible pump for conveying a medium containing solid particles, comprising a pump body 1 and a pump cover 2 that match each other, wherein a shaft 3 is installed through the center of the pump cover 2, and the shaft 3 penetrates into the inner cavity of the pump body 1 and is fixedly installed with an impeller 4 and an impeller nut 5, wherein the impeller 4 can be selected to be open, closed or semi-open. The impeller is positioned on the shaft through the impeller nut, and a baffle plate 6 is also sleeved on the shaft 3 and is located between the pump cover 2 and the impeller 4. The baffle plate is made of cemented carbide, and the gap area between the baffle plate 6 and the pump cover 2 is larger than the outlet hole area of ​​the second external flushing pipeline 11. The outer diameter of the baffle plate 6 is larger than the outer hole of the impeller balance hole 13. A sliding bearing 7 is sleeved on the shaft 3 and is located on the inner side of the pump cover 2. A skeleton oil seal 8 and a spring retaining ring 9 for holes are installed on the outer wall circumference of the sliding bearing 7 and fit with the inner wall of the pump cover 2. The skeleton oil seal 8 is arranged in the pump cover 2 through the spring retaining ring 9 for holes. There is a gap between the sliding bearing 7 and the inner wall of the pump cover 2. The left and right ends of the pump cover 2 are respectively connected with a first external flushing pipeline 10 and a second external flushing pipeline 11. The first external flushing pipeline 10 passes through the pump cover 2 and is connected to the gap for conveying an external cleaning medium to cool and lubricate the sliding bearing 7. The second external flushing pipeline 11 passes through the pump cover 2 and enters the inner side of the pump cover 2. The outlet end of the second external flushing pipeline 11 is located in the gap between the baffle plate 6 and the spring retaining ring 9 for holes. A drainage hole 12 is provided on the pump cover 2, and an impeller balancing hole 13 is provided on the impeller 4.

[0013] Working process: First, the external cleaning medium enters through the first external flushing pipeline 10 to cool and lubricate the sliding bearing; second, the baffle plate 6 that rotates with the shaft changes the direction of the particles so that they cannot directly enter the sliding bearing. At the same time, the outer diameter of the baffle plate 6 is larger than the outer hole of the impeller balancing hole 13 to prevent the particles from flowing out of the impeller balancing hole 13 and then spraying onto the pump cover, thereby protecting the pump cover. The baffle plate 6 is made of hard alloy, which is durable, has a low cost compared to the pump cover, and is easy to replace; third, the skeleton oil seal 8 is used to block the particles from entering Sliding bearing, and the skeleton oil seal 8 is fixed on the pump cover 2 through the hole spring retaining ring 9 to prevent it from falling off; finally, the pumping medium is flushed through the second external flushing pipeline 11 with a cleaning medium higher than the pressure on the back of the impeller 4. Because the gap area between the baffle plate 6 and the pump cover 2 is larger than the hole area of ​​the second external flushing pipeline 11, according to the Bernoulli equation, the pressure of the second external flushing pipeline 11 will not drop. The particles between the baffle plate 6 and the hole spring retaining ring 9 are purged through the second external flushing pipeline 11 so that they flow out of the drain hole 12 with the medium and return to the pool. When the drain hole 12 is blocked, due to its high pressure, the particles can be suppressed from penetrating into the sliding bearing. This application uses four measures to gradually ensure that the sliding bearing is not penetrated by particles, protect the sliding bearing, and is suitable for pumping media containing particulate impurities. Due to its reliable structural design, there is no need to use special materials. The use requirements can be met by selecting conventional ordinary materials, which reduces the manufacturing cost of the pump while extending the service life of the pump.

Claims

1. A submersible pump for conveying a medium containing solid particles, comprising a pump body (1) and a pump cover (2) matching each other, wherein a shaft (3) is installed through the center of the pump cover (2), and characterized in that: The shaft (3) penetrates into the inner cavity of the pump body (1) and is fixedly mounted with an impeller (4) and an impeller nut (5); a baffle plate (6) is sleeved on the shaft (3) and is located between the pump cover (2) and the impeller (4); a sliding bearing (7) is sleeved on the shaft (3) and is located on the inner side of the pump cover (2); a skeleton oil seal (8) and a hole spring retaining ring (9) are installed on the outer wall of the sliding bearing (7) and are in contact with the inner wall of the pump cover (2); a gap exists between the sliding bearing (7) and the inner wall of the pump cover (2); and the pump cover (2) is provided with a plurality of sliding bearings (7) and a plurality of spring retaining rings (9) for holes. The left and right ends of the pump cover (2) are respectively connected to a first external flushing pipeline (10) and a second external flushing pipeline (11), the first external flushing pipeline (10) passes through the pump cover (2) and is connected to the gap, the second external flushing pipeline (11) passes through the pump cover (2) and enters the inner side of the pump cover (2), the outlet end of the second external flushing pipeline (11) is located in the gap between the baffle plate (6) and the hole spring retaining ring (9), the pump cover (2) is provided with a drainage hole (12), and the impeller (4) is provided with an impeller balancing hole (13).

2. A submersible pump for conveying a medium containing solid particles according to claim 1, characterized in that: The gap area between the baffle plate (6) and the pump cover (2) is larger than the outlet hole area of ​​the second external flushing pipeline (11).

3. A submersible pump for conveying a medium containing solid particles according to claim 1, characterized in that: The outer diameter of the baffle plate (6) is larger than the outer hole of the impeller balancing hole (13).

4. A submersible pump for conveying a medium containing solid particles according to claim 1, characterized in that: The impeller (4) can be selected to be open, closed or semi-open.

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