Submersible centrifugal pump

Abstract

The utility model provides a kind of submersible centrifugal pump, belong to submersible pump technical field.It solves the problem of insufficient sealing security of submersible pump in prior art.The utility model includes motor assembly, water pump assembly and filter component, water pump volute upper and lower ends extend outward and form connecting convex body, connecting convex body upper end is fixedly connected with sealing seat body, sealing seat body includes sealing base plate, sealing base plate upper end forms sealing chamber and bearing seat, bearing seat is provided with water pump bearing, the outer portion of pump shaft at sealing chamber lower end is connected with mechanical seal, the diameter size of sealing chamber is greater than bearing seat, sealing chamber outer portion upper end forms first fixed lug, bearing seat upper end is provided with first sealing gasket, sealing chamber interior top end forms second fixed lug, second fixed lug lower end is provided with second sealing gasket.The utility model has the advantages of good sealing effect, high sealing reliability and stable structure.

Description

Technical Field

[0001] This utility model belongs to the field of submersible pump technology and relates to a submersible centrifugal pump. Background Technology

[0002] Submersible centrifugal pumps are submerged fluid transport equipment that integrates the pump body and motor. They are widely used in farmland irrigation, industrial circulating water, sewage treatment, and emergency flood control, and are a commonly used core equipment in various fluid transport projects.

[0003] Chinese patent CN213598197U discloses a double-suction submersible centrifugal pump, including a protective cover and a motor installed inside the protective cover. Sealing covers are fixedly installed at both ends of the protective cover. Two sets of suction mechanisms are symmetrically fixedly installed at both ends of the protective cover. The two sets of suction mechanisms are fixedly connected to the two output shafts of the motor through a rotating shaft that passes through the sealing cover. A bearing is provided between the motor and the sealing cover. The suction mechanism includes a housing fixedly connected to the sealing cover. An impeller is provided inside the housing and fixedly installed on the rotating shaft. A water outlet hole communicating with the inside of the housing is fixedly installed on the housing and fixedly connected to the conveying pipe.

[0004] The patent provides a double-suction submersible centrifugal pump in which the shaft support and sealing between the motor and the sealing cover are achieved solely through bearings, and no other sealing structures or devices are provided, thus failing to form a multi-stage sealing protection effect. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a submersible centrifugal pump.

[0006] The objective of this utility model can be achieved through the following technical solution: A submersible centrifugal pump includes a motor assembly, a pump assembly, and a filter assembly. The pump assembly includes a pump volute, a pump impeller, an impeller base, and a pump shaft. The pump volute has connecting protrusions extending outwards from its upper and lower ends. A sealing seat is fixedly connected to the upper end of each connecting protrusion. The sealing seat includes a sealing base plate. A sealing chamber and a bearing seat are formed at the upper end of the sealing base plate. A pump bearing is disposed in the bearing seat. A mechanical seal is fitted and connected to the pump shaft at the lower end of the sealing chamber. The diameter of the sealing chamber is larger than that of the bearing seat. The upper outer end of the sealed chamber has a first fixing lug, the upper end of the bearing seat has a first sealing gasket, the top of the sealed chamber has a second fixing lug, the lower end of the second fixing lug has a second sealing gasket, the outer ends of the first sealing gasket and the second sealing gasket both have extended protrusions that are the same shape as the first fixing lug and the second fixing lug, respectively, and the first sealing gasket and the second sealing gasket are fixedly connected to the first fixing lug and the second fixing lug by bolts, respectively, and the pump shaft passes through the first sealing gasket, the bearing seat, the second sealing gasket and the sealed chamber in sequence and is connected to the water pump impeller.

[0007] In the aforementioned submersible centrifugal pump, a connecting ring is formed at the upper end of the sealing chassis. The connecting ring is connected to the motor assembly. A first sealing groove is provided in the connecting ring, and a first sealing ring is installed in the first sealing groove. The first sealing ring is sealed and fitted against the inner wall of the motor assembly.

[0008] In the above-mentioned submersible centrifugal pump, a second sealing groove is provided on the outer end face of the sealing chassis, and a second sealing ring is installed in the second sealing groove. The second sealing ring is sealed and fitted to the upper end of the connecting protrusion of the pump volute.

[0009] In the aforementioned submersible centrifugal pump, a first auxiliary sealing ring is sleeved and connected to the outer end of the pump shaft inside the sealed chamber, and a second auxiliary sealing ring is sleeved and connected to the outer end of the pump shaft at the lower end of the mechanical seal.

[0010] In the aforementioned submersible centrifugal pump, a third sealing gasket is externally connected near the lower end of the mechanical seal.

[0011] In the aforementioned submersible centrifugal pump, a plurality of first fastening protrusions are formed on the outside of the motor assembly, a plurality of second fastening protrusions are formed on the outside of the sealing chassis, a plurality of third fastening protrusions are formed on the outside of the connecting protrusion of the pump volute, and a plurality of fourth fastening protrusions are formed on the outside of the impeller base. Fastening bolts are inserted and fixed in the first fastening protrusions, second fastening protrusions, and fourth fastening protrusions.

[0012] Compared with the prior art, the submersible centrifugal pump provided by this utility model has the following beneficial effects: 1. The first sealing gasket is installed on the upper end of the bearing housing and matches the first fixing ear to seal the gap at the upper end of the bearing housing and prevent liquid from entering the bearing area. The second sealing gasket is installed on the top of the sealing chamber and matches the second fixing ear to seal the gap at the top of the sealing chamber, strengthen the sealing inside the chamber, and its shape is perfectly matched with the second fixing ear, fitting without gaps to prevent liquid from leaking from the top.

[0013] 2. The sealing seat integrates the sealing chassis, sealing chamber, bearing seat and connecting ring, reducing assembly gaps, avoiding sealing failure caused by splicing multiple parts, and improving overall sealing reliability.

[0014] 3. The first, second, third and fourth fastening protrusions correspond to the motor assembly, sealing seat, water pump volute and impeller base respectively. They are fixed through the same fastening bolt, so that the three core components form a stable whole, avoiding relative displacement during operation. Moreover, the multiple fastening protrusions are evenly distributed along the outer periphery of the components, so that the fastening force is distributed and transmitted, avoiding local stress concentration, while enhancing the overall vibration resistance and reducing the risk of loosening during long-term operation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the exploded structure of this utility model; Figure 3 This is a schematic diagram of the sealing seat structure.

[0016] In the diagram: 1. Motor assembly; 110. First fastening protrusion; 2. Pump assembly; 21. Pump volute; 211. Connecting protrusion; 212. Third fastening protrusion; 22. Pump impeller; 23. Impeller base; 231. Fourth fastening protrusion; 24. Pump shaft; 3. Filter assembly; 4. Sealing seat; 41. Sealing base; 411. Connecting ring; 412. First sealing groove; 413. Second sealing groove; 414. Second fastening protrusion; 42. Sealing chamber; 43. Bearing seat; 44. First fixing ear; 45. Second fixing ear; 5. Pump bearing; 6. Mechanical seal; 7. First sealing gasket; 8. Second sealing gasket; 9. First sealing ring; 10. Second sealing ring; 11. First auxiliary sealing ring; 12. Second auxiliary sealing ring; 13. Fastening bolt; 14. Third sealing gasket. Detailed Implementation

[0017] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0018] like Figures 1 to 3As shown, this submersible centrifugal pump includes a motor assembly 1, a pump assembly 2, and a filter assembly 3. The pump assembly 2 includes a pump volute 21, a pump impeller 22, an impeller base 23, and a pump shaft 24. The pump volute 21 extends outward at both ends to form annular connecting protrusions 211. A sealing seat 4 is bolted to the upper end of the connecting protrusion 211 to achieve a tight connection between the pump assembly 2 and the sealing seat 4. The sealing seat 4 includes an integrally formed sealing base 41. A sealing chamber 42 and a bearing seat 43 are integrally machined at the upper end of the sealing base 41. A pump bearing 5 is installed inside the bearing seat 43 with an interference fit to provide support for the rotation of the pump shaft 24. The diameter of the sealing chamber 42 is larger than that of the bearing seat 43 to provide sufficient installation space for the sealing components. A mechanical seal 6 is sleeved and connected to the pump shaft 24 at the lower end of the sealing chamber 42. A third sealing gasket 14 is attached to the outside of the mechanical seal 6 near the lower end to further enhance the sealing effect.

[0019] like Figures 2 to 3 As shown, a plurality of first fixing ears 44 are integrally formed on the upper outer side of the sealed chamber 42. A first sealing gasket 7 is correspondingly provided on the upper end of the bearing seat 43. A plurality of second fixing ears 45 are integrally formed on the top inner side of the sealed chamber 42. A second sealing gasket 8 is correspondingly provided on the lower end of the second fixing ears 45. The outer ends of the first sealing gasket 7 and the second sealing gasket 8 are both integrally formed with an extension protrusion, and the shape and number of the extension protrusions are completely matched with the first fixing ears 44 and the second fixing ears 45, respectively. The first sealing gasket 7 is fastened to the first fixing ears 44 by bolts, and the second sealing gasket 8 is fastened to the second fixing ears 45 by bolts to ensure that the gaskets fit without gaps. After the pump shaft 24 passes through the first sealing gasket 7, the bearing seat 43, the second sealing gasket 8 and the sealed chamber 42 in sequence, it is fixed to the center of the water pump impeller 22 by a key to achieve stable power transmission.

[0020] To elaborate further, such as Figures 2 to 3 As shown, the upper end of the sealing chassis 41 is integrally formed with an annular connecting ring 411. During installation, the connecting ring 411 extends into the motor assembly 1 and is fixedly connected to the motor assembly 1. A first sealing groove 412 is provided circumferentially on the inner side of the connecting ring 411. A first sealing ring 9 is embedded in the first sealing groove 412. The first sealing ring 9 is tightly sealed and fitted with the inner wall of the motor assembly 1 to prevent liquid from leaking from the motor connection end. A second sealing groove 413 is provided circumferentially on the outer shaft end face of the sealing chassis 41. A second sealing ring 10 is embedded and fitted with the upper end face of the connecting protrusion 211 of the water pump volute 21 to eliminate the risk of leakage caused by assembly gaps.

[0021] like Figure 2As shown, a first auxiliary sealing ring 11 is sleeved and connected to the outer end of the pump shaft 24 inside the sealed chamber 42, and a second auxiliary sealing ring 12 is sleeved and connected to the outer end of the pump shaft 24 at the lower end of the mechanical seal 6. Through the double protection of the first auxiliary sealing ring 11 and the second auxiliary sealing ring 12, a triple dynamic sealing structure is formed in conjunction with the mechanical seal 6, which effectively blocks the leakage of liquid along the axial direction of the pump shaft 24.

[0022] To elaborate further, such as Figures 1 to 2 As shown, the motor assembly 1 has several first fastening protrusions 110 integrally formed on its exterior, the sealing base 41 has several second fastening protrusions 414 integrally formed on its exterior, the connecting protrusion 211 of the water pump volute 21 has several third fastening protrusions 212 integrally formed on its exterior, and the impeller base 23 has several fourth fastening protrusions 231 integrally formed on its exterior. The positions of the first fastening protrusions 110, the second fastening protrusions 414, the third fastening protrusions 212, and the fourth fastening protrusions 231 correspond one-to-one, and each of them has a coaxial threaded hole inside. The fastening bolts 13 pass through the threaded holes of the above-mentioned protrusions in sequence and are locked, so that the motor assembly 1, the sealing base 4, the water pump volute 21, and the impeller base 23 form a stable integral structure, while providing a stable installation foundation for each sealing component.

[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0024] Although this document uses a variety of terms, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.

Claims

1. A submersible centrifugal pump, comprising a motor assembly (1), a pump assembly (2), and a filter assembly (3), wherein the pump assembly (2) comprises a pump volute (21), a pump impeller (22), an impeller base (23), and a pump shaft (24), characterized in that: The pump volute (21) has connecting protrusions (211) extending outward from both the upper and lower ends. A sealing seat (4) is fixedly connected to the upper end of the connecting protrusion (211). The sealing seat (4) includes a sealing base (41). A sealing chamber (42) and a bearing seat (43) are formed at the upper end of the sealing base (41). A pump bearing is installed in the bearing seat (43). A mechanical seal (6) is sleeved and connected to the pump shaft (24) at the lower end of the sealing chamber (42). The diameter of the sealing chamber (42) is larger than that of the bearing seat (43). A first fixing lug (44) is formed at the upper end of the outer side of the sealing chamber (42). A first sealing gasket is provided at the upper end of the bearing seat (43). The sealing chamber (42) has a second fixing ear (45) at the top of its interior. The second fixing ear (45) has a second sealing gasket (8) at its lower end. The outer ends of the first sealing gasket (7) and the second sealing gasket (8) have extended protrusions that are the same shape as the first fixing ear (44) and the second fixing ear (45) respectively. The first sealing gasket (7) and the second sealing gasket (8) are fixedly connected to the first fixing ear (44) and the second fixing ear (45) respectively by bolts. The pump shaft (24) passes through the first sealing gasket (7), the bearing seat (43), the second sealing gasket (8) and the sealing chamber (42) in sequence and is connected to the water pump impeller (22).

2. A submersible centrifugal pump according to claim 1, characterized in that: A connecting ring (411) is formed at the upper end of the sealing chassis (41). The connecting ring (411) is connected to the motor assembly (1). A first sealing groove (412) is provided in the connecting ring (411). A first sealing ring (9) is installed in the first sealing groove (412). The first sealing ring (9) is sealed and fitted to the inner wall of the motor assembly (1).

3. A submersible centrifugal pump according to claim 1, characterized in that: The outer end face of the sealing chassis (41) is provided with a second sealing groove (413), and a second sealing ring (10) is installed in the second sealing groove (413). The second sealing ring (10) is sealed and fitted to the upper end of the connecting protrusion (211) of the water pump volute (21).

4. A submersible centrifugal pump according to claim 1, characterized in that: The pump shaft (24) inside the sealed chamber (42) is fitted with a first auxiliary sealing ring (11), and the pump shaft (24) at the lower end of the mechanical seal (6) is fitted with a second auxiliary sealing ring (12).

5. A submersible centrifugal pump according to claim 1, characterized in that: The mechanical seal (6) has a third sealing gasket (14) connected to the outside near the lower end.

6. A submersible centrifugal pump according to claim 1, characterized in that: The motor assembly (1) has a plurality of first fastening protrusions (110) formed on its exterior, the sealing chassis (41) has a plurality of second fastening protrusions (414) formed on its exterior, the connecting protrusion (211) of the water pump volute (21) has a plurality of third fastening protrusions (212) formed on its exterior, and the impeller base (23) has a plurality of fourth fastening protrusions (231) formed on its exterior. Fastening bolts (13) are inserted and fixed in the first fastening protrusions (110), the second fastening protrusions (414), the second fastening protrusions (414), and the fourth fastening protrusions (231).

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