CN211950898U

CN211950898U - High-sealing high-pressure submersible sewage electric pump

Info

Publication number: CN211950898U
Application number: CN202020591108.3U
Authority: CN
Inventors: 陈祥云; 周润行; 周恒兵; 陈阿娣
Original assignee: Jiangsu Meifeng Pump Co ltd
Current assignee: Jiangsu Meifeng Pump Co ltd
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-11-17
Anticipated expiration: 2030-04-20

Abstract

The utility model discloses a high-pressure sewage submersible electric pump of high leakproofness contains a preceding pump cover and a back pump cover, preceding pump cover and back pump cover between be equipped with a spiral case, the spiral case in be equipped with an impeller, a serial communication port, one side of back pump cover be equipped with a first seal receptacle and a second seal receptacle, first seal receptacle in be equipped with a first mechanical seal, the second seal receptacle in be equipped with a second mechanical seal, one side of second seal receptacle be equipped with a surge chamber and an grease chamber, a pivot runs through grease chamber, surge chamber, second seal receptacle, first seal receptacle, back pump cover and preceding pump cover. Because the mode of twice pressure reduction is adopted, particularly the pressure reduction of the pressure reduction cavity, the second mechanical seal is ensured to bear low pressure all the time, thereby ensuring that the dynamic seal cannot leak, and ensuring that the pump can reliably run for a long time.

Description

High-sealing high-pressure submersible sewage electric pump

Technical Field

The utility model relates to a immersible pump, more exactly, be a high leakproofness's high-pressure submerged sewage charge pump.

Background

The dynamic seal (mechanical seal) of the rotating shaft of the submersible sewage pump, particularly the reliability of the dynamic seal of the rotating shaft of the high-pressure pump, is an important link for the reliable use of the submersible sewage pump. The reliability design of the water pump is always an important subject for water pump science and technology workers to continuously research and improve.

At present, the rotating shaft dynamic seal of the high-pressure pump basically adopts two modes.

As shown in fig. 2, two single-end mechanical seals working in series are used, and the first mechanical seal L1 is balanced and works in the pump cavity to bear the high pressure of the pump. The second mechanical seal L2 adopts an unbalanced type, works in a closed oil storage cavity, and bears normal pressure in the validity period of the mechanical seal. In this way, the mechanical seal is not completely leakless, especially the mechanical seal bearing high pressure, and the leakage is larger, so that the second mechanical seal L2 working in the closed oil storage chamber can be failed by bearing high pressure, and then the second mechanical seal L2 leaks to the motor chamber, causing motor failure, and the pump can not work normally.

As shown in fig. 3, sub-impeller decompression plus a double mechanical seal L3 is used. The auxiliary impeller is used to reduce the pump cavity pressure to which the mechanical seal is subjected. In the mode, the auxiliary impeller works in a sewage medium, so that the auxiliary impeller is abraded quickly, the pressure reducing capacity of the auxiliary impeller is reduced after the auxiliary impeller is abraded, and accordingly the mechanical seal bears high pressure and leaks to finally leak to a motor cavity, the motor is failed, and the pump cannot work normally.

SUMMERY OF THE UTILITY MODEL

The utility model discloses solve the technical problem that prior art exists mainly to a high-pressure sewage submerged motor pump of high leakproofness is provided.

The above technical problem of the present invention can be solved by the following technical solutions:

the high-pressure submersible sewage electric pump is characterized in that the high-pressure submersible sewage electric pump comprises a front pump cover and a rear pump cover, a spiral case is arranged between the front pump cover and the rear pump cover, an impeller is arranged in the spiral case, the high-pressure submersible sewage electric pump is characterized in that a first sealing seat and a second sealing seat are arranged on one side of the rear pump cover, a first mechanical seal is arranged in the first sealing seat, a second mechanical seal is arranged in the second sealing seat, a buffer chamber and an oil chamber are arranged on one side of the second sealing seat, and a rotating shaft penetrates through the oil chamber, the buffer chamber, the second sealing seat, the first sealing seat, the rear pump cover and the front pump cover.

As the embodiment of the preferred embodiment of the utility model, impeller, back pump cover, first seal receptacle, surge chamber enclose into an isolation chamber, isolation chamber department be equipped with a first drainage hole, first mechanical seal be located isolation chamber in, first seal receptacle, second seal receptacle, surge chamber constitute a decompression chamber, decompression chamber department be equipped with a second drainage hole, second seal receptacle, surge chamber, grease chamber constitute an oil storage chamber, second mechanical seal be located the oil storage chamber in.

The utility model discloses a high leakproofness's high-pressure submerged sewage charge pump has following advantage: because the mode of twice pressure reduction is adopted, particularly the pressure reduction of the pressure reduction cavity, the second mechanical seal is ensured to bear low pressure all the time, thereby ensuring that the dynamic seal cannot leak, and ensuring that the pump can reliably run for a long time.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural view of a high-tightness high-pressure submersible sewage electric pump of the present invention;

FIG. 2 is a schematic view of a conventional high pressure pump with a dynamic seal of the rotating shaft in a first mode;

fig. 3 shows a dynamic seal structure of a rotating shaft of a conventional high-pressure pump, which is the second embodiment.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention can be more clearly and clearly defined.

As shown in fig. 1, the high-sealing high-pressure submersible electric pump comprises a front pump cover 1 and a rear pump cover 4, a spiral casing 3 is arranged between the front pump cover 1 and the rear pump cover 4, and an impeller 2 is arranged in the spiral casing 3, and is characterized in that a first sealing seat 6 and a second sealing seat 7 are arranged on one side of the rear pump cover 4, a first mechanical seal 5 is arranged in the first sealing seat 6, a second mechanical seal 8 is arranged in the second sealing seat 7, a buffer chamber 9 and an oil chamber 10 are arranged on one side of the second sealing seat 7, and a rotating shaft 11 penetrates through the oil chamber 10, the buffer chamber 9, the second sealing seat 7, the first sealing seat 6, the rear pump cover 4 and the front pump cover 1.

This impeller 2, back pump cover 4, first seal receptacle 6, buffer chamber 9 enclose and become an isolation chamber K1, this isolation chamber department is equipped with a first drainage hole S1, this first mechanical seal 5 is arranged in this isolation chamber K1, this first seal receptacle 6, second seal receptacle 7, buffer chamber 9 constitute a decompression chamber K2, this decompression chamber department is equipped with a second drainage hole S2, this second seal receptacle 7, buffer chamber 9, grease chamber 10 constitute a grease storage chamber K3, this second mechanical seal 8 is arranged in this grease storage chamber K3.

When the pump works, high-pressure water in the pump cavity leaks into the isolation cavity through the impeller back opening ring with small gap and is discharged through the first liquid discharge hole S1, when the effective leakage gap area is far smaller than the area of the first liquid discharge hole S1, the isolation cavity is low-pressure, and the first mechanical seal 5 bears low pressure and basically has no leakage. When the abrasion of the clearance of the back opening ring of the impeller is increased, the pressure of the isolation cavity can be increased along with the increase of the pressure of the isolation cavity until the pressure of the pump is equal to the pressure of the pump, and at the moment, the first mechanical seal 5 bears high pressure and leaks, but the leakage area of the first mechanical seal 5 is far smaller than the area of the second liquid discharge hole S2 unless the first mechanical seal 5 is damaged to cause large leakage, so that the pressure reduction cavity is always low pressure, the second mechanical seal 8 bears low pressure all the time, the working reliability of the second mechanical seal is guaranteed, liquid cannot be leaked to the motor cavity, and the long-term reliable operation of the pump is guaranteed.

This high-pressure sewage submerged pump of high leakproofness simple structure, the effect is obvious, low cost, the practicality is strong.

Without being limited thereto, any changes or substitutions which are not thought of through creative efforts should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.

Claims

1. The high-pressure submersible sewage electric pump is characterized by comprising a front pump cover (1) and a rear pump cover (4), a volute (3) is arranged between the front pump cover (1) and the rear pump cover (4), an impeller (2) is arranged in the volute (3), a first sealing seat (6) and a second sealing seat (7) are arranged on one side of the rear pump cover (4), a first mechanical seal (5) is arranged in the first sealing seat (6), a second mechanical seal (8) is arranged in the second sealing seat (7), a buffer chamber (9) and an oil chamber (10) are arranged on one side of the second sealing seat (7), and a rotating shaft (11) penetrates through the oil chamber (10), the buffer chamber (9), the second sealing seat (7), the first sealing seat (6), A rear pump cover (4) and a front pump cover (1).

2. The high-tightness high-pressure submersible sewage electric pump according to claim 1, wherein the impeller (2), the rear pump cover (4), the first seal seat (6) and the buffer chamber (9) enclose an isolation chamber (K1), a first drainage hole (S1) is formed in the isolation chamber (K1), the first seal seat (6), the second seal seat (7) and the buffer chamber (9) form a decompression chamber (K2), a second drainage hole (S2) is formed in the decompression chamber, an oil storage chamber (K3) is formed by the second seal seat (7), the buffer chamber (9) and the oil chamber (10), and the second mechanical seal (8) is located in the oil storage chamber (K3).