CN216950959U

CN216950959U - Plastic type sewage and dirt submersible electric pump

Info

Publication number: CN216950959U
Application number: CN202220725550.XU
Authority: CN
Inventors: 林发明; 于露; 黎瑞; 向为
Original assignee: China Dafu Pump Industry Co ltd
Current assignee: China Dafu Pump Industry Co ltd
Priority date: 2022-03-29
Filing date: 2022-03-29
Publication date: 2022-07-12
Anticipated expiration: 2032-03-29

Abstract

The utility model provides a plastic type sewage and dirt submersible electric pump, and belongs to the field of pumps. It has solved the not good problem of current submerged motor pump seal effect. This plastics type sewage filth submerged motor pump, including the motor portion that has the output shaft, the pump body that has water inlet and delivery port and from last to connecting gradually oil chamber cap and the impeller in motor portion output shaft down, the oil chamber has bellied choma downwards on covering, the impeller up end has bellied back of the body ring that makes progress, oil chamber cap choma and impeller back of the body ring cross seal form the medium chamber that has radial gap, form the grease chamber between grease chamber cap up end and the motor portion terminal surface, and be located and overlap respectively on the output shaft in medium chamber and the oil chamber and be equipped with single-ended mechanical seal one and single-ended mechanical seal two, impeller hub is last to have seted up two and makes its medium intracavity have the pressure differential balance hole of pressure. The utility model has the advantages of good sealing performance, long service life of mechanical seal and long service life.

Description

Plastic type sewage and dirt submersible electric pump

Technical Field

The utility model belongs to the field of pumps, and relates to a submersible electric pump, in particular to a plastic type sewage and dirt submersible electric pump.

Background

The conventional sealing structure of the conventional sewage electric pump is two single-end-face mechanical seals, and two common problems exist, namely firstly, the mechanical seal static ring of a medium cavity is ejected out when the oil cavity is pressurized for testing gas, and cannot be well reset, so that the outer seal fails. And secondly, the mechanical sealing friction pair of the medium cavity is easily abraded by solid particles and the spring is wound by long fiber sundries, so that the sealing is failed, and the whole machine is damaged.

Disclosure of Invention

The utility model aims to solve the problems in the prior art and provides a plastic type sewage and sewage submersible electric pump which is good in sealing performance, long in service life of mechanical seal and long in service life of the submersible electric pump.

The purpose of the utility model can be realized by the following technical scheme: the utility model provides a plastics type sewage filth submerged motor pump, its characterized in that, including the motor portion that has the output shaft, have the pump body of water inlet and delivery port and from last to connecting gradually oil chamber cap and the impeller in motor portion output shaft down, oil chamber cap on have a bellied choma downwards, the impeller up end upwards bellied back of the body ring has, oil chamber cap choma and impeller back of the body ring cross seal form the medium chamber that has radial gap, oil chamber cap up end and motor portion terminal surface between form the grease chamber, and be located the cover is equipped with single-ended mechanical seal one and single-ended mechanical seal two on the output shaft in medium chamber and the oil chamber respectively, impeller hub on offer and make its medium intracavity have the balancing hole of pressure differential.

In the above-mentioned plastic type submerged electric pump for sewage and sewage, the first single-end-face mechanical seal is used for preventing a flowing medium from entering the motor part, the second single-end-face mechanical seal is used for preventing the flowing medium from entering the oil chamber, and both the first single-end-face mechanical seal and the second single-end-face mechanical seal are composed of a stationary ring and a mechanical seal spring which are sleeved on the conveying shaft.

In the above plastic type submersible electric pump for sewage and sewage, a pressing plate for preventing the oil chamber from being ejected out during the pressure test is arranged on the end surface of the stationary ring in the second mechanical seal with single end surface, and the pressing plate is fixed on the end surface of the oil chamber cover through four fastening screws.

In the above plastic type submersible electric pump for sewage and sewage, the cavity of the oil chamber is filled with mechanical oil, and the side surface of the oil chamber is provided with an oil injection threaded hole for injecting oil.

In the above-mentioned plastic type submersible electric pump for sewage and sewage, the first single-end-face mechanical seal and the single-end-face mechanical seal are designed in a coaxial series structure.

Compared with the prior art, the plastic type sewage and sewage submersible electric pump structure can prevent large solid particles and long fiber materials from flowing into the cavity body to wind the mechanical seal spring, and pressure difference exists between the inside and the outside of the cavity body, so that medium circulation flow is promoted, and effective heat dissipation of mechanical seal is ensured.

Drawings

Fig. 1 is a half sectional view of the present plastic type sewage submersible electric pump.

Fig. 2 is a schematic view of a part a of fig. 1.

In the figure, 1, a motor part; 2. an output shaft; 3. a pump body; 4. an oil chamber cover; 5. an oral ring; 6. an impeller; 7. a dorsal loop; 8. a media chamber; 9. an oil chamber; 10. mechanically sealing the single end face; 11. mechanically sealing the single end face; 12. a balance hole; 13. a stationary ring; 14. a mechanical seal spring; 15. pressing a plate; 16. and (7) oiling threaded holes.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the plastic type submersible electric pump for sewage and sewage comprises a motor part 1 with an output shaft 2, a pump body 3 with a water inlet and a water outlet, and an oil chamber cover 4 and an impeller 6 which are sequentially connected to the output shaft 2 in the motor part 1 from top to bottom, wherein the oil chamber cover 4 is provided with a mouth ring 5 protruding downwards, the upper end surface of the impeller 6 is provided with a back ring 7 protruding upwards, the mouth ring 5 of the oil chamber cover 4 and the back ring 7 of the impeller 6 are sealed in a crossed manner to form a medium cavity 8 with a radial gap, the unilateral distance of the radial gap is 0.5mm, an oil chamber 9 is formed between the upper end surface of the oil chamber cover 4 and one end surface of the motor part 1, the output shaft 2 positioned in the medium cavity 8 and the oil chamber 9 is respectively sleeved with a unilateral mechanical seal one 10 and a unilateral mechanical seal two, two balancing holes 12 for enabling pressure difference in the medium cavity 8 are formed in a hub of the impeller 6, the 2 balancing holes 12 have the diameter of 2mm, the mechanical seal mounting structure of the medium cavity 8 is improved, the static ring 13 of the single-end-face mechanical seal secondary 11 is fixed by the pressing plate 15, and the single-end-face mechanical seal secondary moving ring is integrally protected. By means of two protections, the reliability of the mechanical sealing of the medium chamber 8 is ensured.

In more detail, the first single-end-face mechanical seal 10 is used for preventing a flowing medium from entering the motor part 1, the second single-end-face mechanical seal 11 is used for preventing the flowing medium from entering the oil chamber 9, and both the first single-end-face mechanical seal 10 and the second single-end-face mechanical seal 11 are composed of a static ring 13 and a mechanical seal spring 14 which are sleeved on the conveying shaft.

In more detail, a pressure plate 15 for preventing the oil chamber 9 from being ejected during the pressure test is arranged on the end surface of the static ring 13 in the single-end mechanical seal 11, and the pressure plate 15 is fixed on the end surface of the oil chamber cover 4 through four fastening screws.

In more detail, the cavity of the oil chamber 9 is filled with mechanical oil, and the side surface of the oil chamber 9 is provided with an oil injection threaded hole 16 for injecting oil.

In further detail, the first single-ended mechanical seal 10 and the second single-ended mechanical seal are designed in a coaxial series structure.

The upper end face of a static ring 13 in a single-end-face mechanical seal second 11 is provided with a pressing plate 15 with four fastening screws, the static ring 13 is fixed, the static ring 13 can be prevented from being ejected out in a 9-cavity air pressure test of an oil chamber, a 4-port ring 5 of an oil chamber cover and a 6-back ring 7 of an impeller are in cross sealing, the unilateral distance of a radial gap is 0.5mm, a hub of the impeller 6 is provided with 2 balance holes 12 with the diameter of 2mm, the structure can prevent large solid particles and long fiber objects from flowing into a cavity winding mechanical seal spring 14, pressure difference exists inside and outside the cavity, media are enabled to flow circularly, and effective heat dissipation of mechanical seal is guaranteed.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. The plastic type sewage and sewage submersible electric pump is characterized by comprising a motor part (1) with an output shaft (2), a pump body (3) with a water inlet and a water outlet, and an oil chamber cover (4) and an impeller (6) which are sequentially connected onto the output shaft (2) in the motor part (1) from top to bottom, wherein the oil chamber cover (4) is provided with a downward convex opening ring (5), the upper end surface of the impeller (6) is provided with an upward convex back ring (7), the opening ring (5) of the oil chamber cover (4) and the back ring (7) of the impeller (6) are in cross sealing to form a medium cavity (8) with a radial gap, an oil chamber (9) is formed between the upper end surface of the oil chamber cover (4) and one end surface of the motor part (1), and the output shaft (2) in the medium cavity (8) and the oil chamber (9) is respectively sleeved with a single-end-surface mechanical sealing I (10) and a single-end-surface mechanical sealing II, and a balance hole (12) for ensuring pressure difference in the medium cavity (8) is formed in the hub of the impeller (6).

2. A plastic type sewage sludge submersible electric pump according to claim 1, characterized in that said one end mechanical seal (10) is used for preventing the flowing medium from entering into the motor part (1), said two end mechanical seal (11) is used for preventing the flowing medium from entering into the oil chamber (9), said one end mechanical seal (10) and said two end mechanical seal (11) are both composed of a static ring (13) and a mechanical seal spring (14) which are sleeved on the conveying shaft.

3. A plastic type sewage and sewage submersible electric pump according to claim 2, characterized in that a pressure plate (15) for preventing the ejection of the oil chamber (9) during the pressure test is provided on the end surface of the stationary ring (13) in the single end surface mechanical seal two (11), and the pressure plate (15) is fixed on the end surface of the oil chamber cover (4) by four fastening screws.

4. A plastic type sewage sludge submersible electric pump according to claim 1 characterized in that the chamber of the oil chamber (9) is filled with mechanical oil and the side of the oil chamber (9) has oil filling threaded hole (16) for oil filling.

5. A plastic sewage sludge submersible electric pump according to claim 1 wherein the single ended mechanical seal one (10) and the single ended mechanical seal are of coaxial series configuration design.