A submersible sewage pump

Abstract

This utility model provides a submersible sewage pump, belonging to the field of water pump technology. It solves the problem of insufficient sealing performance in existing submersible sewage pumps. This utility model includes a base, pump body, oil chamber, pump shaft, upper pump housing, and upper pump barrel. An upper pump cover is fixedly connected to the upper end of the upper pump housing. One end of the pump shaft is connected to an upper bearing. A second bearing seat is formed at the upper end of the oil chamber. The second bearing seat has a closed, enclosed structure, and a lower bearing is installed within it. A second oil cavity is formed inside the oil chamber. A first sealing mounting groove is formed at the lower end of the second bearing seat. A first mechanical seal is installed in the first sealing mounting groove. A sealing end cap is sealed to the lower side of the concave body. A sealing protrusion is formed at the center of the sealing end cap. A second sealing mounting groove is formed inside the concave body. A second mechanical seal is installed in the second sealing mounting groove, and the second mechanical seal is fitted and fixed to the top of the sealing protrusion. This utility model has the advantages of high sealing performance and good protection.

Description

Technical Field

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

[0002] Submersible sewage pumps are specialized equipment for underwater sewage transportation. They feature an integrated motor and pump body design, coupled with a high-strength waterproof sealing structure, allowing them to operate completely submerged in sewage. They can efficiently transport sewage containing impurities such as fibers, silt, and solid particles, making them suitable for municipal sewage discharge, industrial wastewater treatment, building dewatering, and river dredging.

[0003] Chinese patent publication number CN202273874U discloses a submersible sewage pump, including a housing with a drive motor inside; an oil tank located below the housing, with a probe suspended inside the oil tank; a pump body located below the oil tank, wherein the lower part of the pump body accommodates a main impeller and the upper part of the pump body accommodates a secondary impeller; a base located below the pump body; and a sealing element is also provided inside the oil tank, which separates the oil tank from the housing.

[0004] The patent provides a submersible sewage pump that achieves sealing only by separating the oil tank from the outer casing with a sealing element, which is insufficient for effective sealing. Utility Model Content

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

[0006] The objective of this utility model can be achieved through the following technical solution: A submersible sewage pump includes a base, a pump body, an oil chamber, a pump shaft, an upper pump housing, and an upper pump cylinder. A connecting ring is formed at the upper end of the pump body, and a connecting protrusion is formed at the lower end of the oil chamber. The lower end of the oil chamber and the connecting protrusion are fitted to the connecting ring and fixed by bolts. A connecting flange is formed at the upper end of the oil chamber. The lower end of the upper pump housing is fitted to and fixedly connected to the connecting flange. An upper pump cover is fixedly connected to the upper end of the upper pump housing. A first bearing seat is formed in the upper pump cover, and an upper bearing is installed in the first bearing seat. One end of the pump shaft is connected to the upper bearing. A second bearing seat is formed at the upper end of the oil chamber. The second bearing seat has a closed, enclosed structure, and the second shaft... A lower bearing is installed in the bearing housing. A first oil chamber is formed in the oil chamber on one side of the second bearing housing, and a float switch is installed in the first oil chamber. A second oil chamber is formed inside the oil chamber. A first sealing mounting groove is formed at the lower end of the second bearing housing. A first mechanical seal is installed in the first sealing mounting groove. A concave body is formed at the lower end of the oil chamber. A sealing end cap is sealed and connected to the lower side of the concave body. A sealing protrusion is formed at the center of the sealing end cap. A second sealing mounting groove is formed inside the concave body. A second mechanical seal is installed in the second sealing mounting groove. The second mechanical seal is fitted and fixed to the top of the sealing protrusion. The pump shaft passes through the lower bearing, the first mechanical seal, and the second mechanical seal in sequence.

[0007] In the aforementioned submersible sewage pump, a sealing ring is installed on the upper end of the sealing end cover, and the sealing ring is in contact with the lower end of the oil chamber.

[0008] In the above-mentioned submersible sewage pump, a submersible motor is installed inside the upper pump casing, and an oil-water probe is installed in the oil chamber. The oil-water probe extends out of the upper end of the oil chamber and is connected to an outgoing cable at the upper end of the oil-water probe.

[0009] In the above-mentioned submersible sewage pump, an upper fixing ring and a lower fixing ring are respectively installed on the outer side of the upper pump casing near the upper end and near the lower end. The inner wall of the upper pump cylinder is in contact with the outer side of the upper fixing ring and the lower fixing ring. A cavity structure is formed between the inner wall of the upper pump cylinder and the outer wall of the upper pump casing. A locking ring is installed at the upper end of the upper pump cylinder, and the locking ring is fixed to the upper pump cover.

[0010] In the aforementioned submersible sewage pump, a connector is formed on one side of the pump body, and a water outlet pipe seat is fixedly installed on one side of the connector.

[0011] Compared with the prior art, the submersible sewage pump provided by this utility model has the following beneficial effects: 1. The second bearing housing at the upper end of the oil chamber adopts a closed enclosure structure, which can effectively prevent impurities in sewage from entering the bearing and avoid bearing wear or jamming.

[0012] 2. The first mechanical seal and the second mechanical seal are respectively installed at key positions at the upper and lower ends of the oil chamber to form a double-layer anti-leakage barrier to prevent oil leakage from the oil chamber or external sewage from entering the oil chamber. A sealing ring is added to the upper end of the sealing end cover to fit tightly with the lower end of the oil chamber, further filling the connection gap and strengthening the overall sealing performance.

[0013] 3. The cavity structure formed between the upper pump cylinder and the upper pump casing can buffer the vibration during equipment operation, reduce component resonance, isolate some of the motor operating noise, and prevent external hard objects from directly impacting the submersible motor inside the upper pump casing, thus improving the motor's protection capability under complex sewage discharge conditions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] In the diagram: 1. Base; 2. Pump body; 21. Connecting ring; 22. Connecting body; 3. Oil chamber; 31. Connecting protrusion; 32. Connecting flange; 33. Second bearing seat; 34. Lower bearing; 35. First oil chamber; 36. Second oil chamber; 37. First sealing mounting groove; 38. Concave body; 39. Second sealing mounting groove; 4. Pump shaft; 5. Upper pump casing; 51. Upper fixing ring; 52. Lower fixing ring; 53. Cavity structure; 6. Upper pump barrel; 61. Locking ring; 7. Upper pump cover; 71. First bearing seat; 72. Upper bearing; 8. Float switch; 9. First mechanical seal; 10. Second mechanical seal; 11. Sealing end cover; 111. Sealing protrusion; 112. Sealing ring; 12. Submersible motor; 13. Oil-water probe; 131. Lead-out cable; 14. Water outlet pipe seat. Detailed Implementation

[0016] 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.

[0017] like Figure 1 As shown, this submersible sewage pump includes a base 1, a pump body 2, an oil chamber 3, a pump shaft 4, an upper pump housing 5, and an upper pump cylinder 6. The upper end of the pump body 2 is integrally formed with a connecting ring 21, and the lower end of the oil chamber 3 is correspondingly formed with a connecting protrusion 31. During assembly, the lower end face of the oil chamber 3 fits against the upper surface of the connecting ring 21, and the connecting protrusion 31 is embedded in the corresponding positioning structure of the connecting ring 21. The two are then fastened together by bolts evenly distributed around the circumference.

[0018] in, The upper end of the oil chamber 3 is integrally formed with a connecting flange 32. The lower end face of the upper pump housing 5 is tightly fitted with the upper surface of the connecting flange 32. The connection is fixed by bolts passing through the mounting holes of both. The design of the connecting flange 32 increases the contact area, further improving the sealing performance and preventing sewage from seeping into the oil chamber 3. The upper pump housing 5 is fixedly connected to the upper pump cover 7 by bolts. The middle of the upper pump cover 7 is integrally formed with a first bearing seat 71. The upper bearing 72 is installed inside the first bearing seat 71 with an interference fit. One end of the pump shaft 4 extends into the first bearing seat 71 and is tightly fitted with the inner ring of the upper bearing 72, providing stable support for the high-speed rotation of the pump shaft 4 and reducing radial runout.

[0019] like Figure 1 As shown, a second bearing housing 33 is integrally formed at the upper end of the oil chamber 3 corresponding to the pump shaft 4. The second bearing housing 33 is a fully enclosed structure, and a lower bearing 34 is installed inside with an interference fit. The other end of the pump shaft 4 passes through the second bearing housing 33 and mates with the inner ring of the lower bearing 34. Through the double support of the upper bearing 72 and the lower bearing 34, the coaxiality and stability of the pump shaft 4 during long-term operation are ensured. The oil chamber 3 on one side of the second bearing housing 33 is divided into an independent first oil chamber 35. A float switch 8 is fixedly installed in the first oil chamber 35, which can monitor the oil volume and oil-water mixing in the oil chamber 3 in real time. When oil leakage or water ingress occurs, the float switch 8 can trigger an alarm in time to ensure equipment safety. The oil chamber 3 is also provided with a second oil chamber 36 for storing lubricating oil to provide lubrication and protection for the lower bearing 34 and subsequent sealing components.

[0020] The lower end of the second bearing housing 33 is machined with a first sealing mounting groove 37 around the pump shaft 4. A first mechanical seal 9 is embedded in the first sealing mounting groove 37 and fixed by a sealing cap and bolts. This effectively prevents the lubricating oil in the second oil chamber 36 from seeping upward into the upper pump housing 5, and at the same time prevents the sewage in the upper pump housing 5 from flowing downward into the oil chamber 3. A recess 38 is machined at the lower end of the oil chamber 3 corresponding to the position of the pump shaft 4. A sealing end cap 11 is fixedly connected to the lower side of the recess 38 by bolts. A sealing ring 112 is attached to the upper surface of the sealing end cap 11. The sealing ring 112 fits tightly against the lower surface of the oil chamber 3 to form the first seal. The system is designed to prevent external sewage from seeping into the oil chamber 3 through the connection between the concave body 38 and the sealing end cap 11. The sealing end cap 11 has an integrally formed sealing protrusion 111 at its center. The inner side of the concave body 38 is machined around the pump shaft 4 with a second sealing mounting groove 39. A second mechanical seal 10 is installed in the second sealing mounting groove 39. The stationary ring of the second mechanical seal 10 fits tightly with the top of the sealing protrusion 111, completely blocking sewage from entering the oil chamber 3. The pump shaft 4 passes through the lower bearing 34, the first mechanical seal 9, and the second mechanical seal 10 in sequence. All components are precisely aligned along the axis of the pump shaft 4 to ensure sealing and smooth operation during operation.

[0021] To elaborate further, a submersible motor 12 is fixedly installed inside the upper pump housing 5 by bolts. The output shaft of the submersible motor 12 is coaxially connected to the pump shaft 4 through a coupling, providing power for the rotation of the pump shaft 4. An oil-water probe 13 is fixedly installed inside the oil chamber 3 near the connecting flange 32. The detection end of the oil-water probe 13 extends into the second oil chamber 36, and the signal output end of the oil-water probe 13 extends upward from the upper end of the oil chamber 3 and is connected to an outgoing cable 131.

[0022] like Figure 1 As shown, an upper fixing ring 51 and a lower fixing ring 52 are respectively welded and fixed to the outer side of the upper pump housing 5 near the upper end and near the lower end. The upper pump cylinder 6 is sleeved on the outer side of the upper pump housing 5, and the inner wall of the upper pump cylinder 6 is tightly fitted with the outer side of the upper fixing ring 51 and the lower fixing ring 52. The upper fixing ring 51 and the lower fixing ring 52 not only serve to position the upper pump cylinder 6, but also enhance the connection stability between the upper pump housing 5 and the upper pump cylinder 6. An annular cavity structure 53 is formed between the inner wall of the upper pump cylinder 6 and the outer wall of the upper pump housing 5. A locking ring 61 is fixed to the upper end of the upper pump cylinder 6 by bolts. The lower end face of the locking ring 61 is tightly fitted with the upper end face of the upper pump cover 7. The locking ring 61 is fixed to the upper pump cover 7 by bolts passing through it, which further strengthens the connection between the upper pump cylinder 6 and the upper pump housing 5 and prevents the components from loosening due to water flow impact during diving operations.

[0023] To elaborate further, a connector 22 is integrally formed on one side of the pump body 2. The internal channel of the connector 22 is connected to the pump cavity of the pump body 2. On the side of the connector 22 away from the pump body 2, a water outlet pipe seat 14 is fixedly installed by a flange and bolts. The other end of the water outlet pipe seat 14 can be connected to an external sewage pipe. The sewage in the pump body 2 enters the water outlet pipe seat 14 through the connector 22 and is finally discharged to the designated location.

[0024] 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.

[0025] 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 sewage pump, comprising a base (1), a pump body (2), an oil chamber (3), a pump shaft (4), an upper pump casing (5), and an upper pump cylinder (6), characterized in that: A connecting ring (21) is formed at the upper end of the pump body (2), and a connecting protrusion (31) is formed at the lower end of the oil chamber (3). The lower end of the oil chamber (3) and the connecting protrusion (31) are attached to the connecting ring (21) and fixed by bolts. A connecting flange (32) is formed at the upper end of the oil chamber (3). The lower end of the upper pump housing (5) is attached to the connecting flange (32) and fixedly connected. An upper pump cover (7) is fixedly connected to the upper end of the upper pump housing (5). A first bearing seat (71) is formed in the upper pump cover (7), and an upper bearing (72) is installed in the first bearing seat (71). One end of the pump shaft (4) is connected to the upper bearing (72). A second bearing seat (33) is formed at the upper end of the oil chamber (3). The second bearing seat (33) is a closed structure, and a lower bearing (34) is installed in the second bearing seat (33). A first bearing seat (34) is formed in the oil chamber (3) on one side of the second bearing seat (33). An oil chamber (35) is provided, and a float switch (8) is installed in the first oil chamber (35). A second oil chamber (36) is formed inside the oil chamber (3). A first sealing mounting groove (37) is formed at the lower end of the second bearing seat (33). A first mechanical seal (9) is installed in the first sealing mounting groove (37). A concave body (38) is formed at the lower end of the oil chamber (3). A sealing end cap (11) is sealed and connected to the lower side of the concave body (38). A sealing protrusion (111) is formed at the center of the sealing end cap (11). A second sealing mounting groove (39) is formed inside the concave body (38). A second mechanical seal (10) is installed in the second sealing mounting groove (39). The second mechanical seal (10) is fitted and fixed to the top of the sealing protrusion (111). The pump shaft (4) passes through the lower bearing (34), the first mechanical seal (9), and the second mechanical seal (10) in sequence.

2. A submersible sewage pump according to claim 1, characterized in that: A sealing ring (112) is installed on the upper end of the sealing end cap (11), and the sealing ring (112) is in contact with the lower end of the oil chamber (3).

3. A submersible sewage pump according to claim 1, characterized in that: The upper pump housing (5) is equipped with a submersible motor (12), and the oil chamber (3) is equipped with an oil-water probe (13). The oil-water probe (13) extends out of the upper end of the oil chamber (3) and the upper end of the oil-water probe (13) is connected to an outgoing cable (131).

4. A submersible sewage pump according to claim 1, characterized in that: An upper fixing ring (51) and a lower fixing ring (52) are respectively installed on the outer side near the upper end and near the lower end of the upper pump housing (5). The inner wall of the upper pump cylinder (6) is in contact with the outer side of the upper fixing ring (51) and the lower fixing ring (52). A cavity structure (53) is formed between the inner wall of the upper pump cylinder (6) and the outer wall of the upper pump housing (5). A locking ring (61) is installed at the upper end of the upper pump cylinder (6). The locking ring (61) is fixed to the upper pump cover (7).

5. A submersible sewage pump according to claim 1, characterized in that: A connector (22) is formed on one side of the pump body (2), and a water outlet pipe seat (14) is fixedly installed on one side of the connector (22).

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