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CN-224228929-U - Radial sealing structure based on front guard plate of submersible sewage pump

CN224228929UCN 224228929 UCN224228929 UCN 224228929UCN-224228929-U

Abstract

The utility model provides a radial sealing structure based on a front guard plate of a submersible sewage pump, which belongs to the technical field of submersible pumps and comprises a volute, an impeller and a front guard plate, wherein the impeller is provided with a front hub extending towards the front guard plate, one side of the front guard plate, which faces the front hub, is provided with a sealing step, the sealing step is provided with an annular sealing surface which is matched with the circumferential surface of the front hub, the front hub is in rotary fit with the front guard plate so as to form radial sealing for blocking a fluid backflow passage between the circumferential surface of the front hub and the annular sealing surface, the sealing step is also provided with a rear axial end surface which is in axial non-contact with the front hub, and a non-contact axial gap is formed between the rear axial end surface and the front axial end surface of the front hub. According to the utility model, the sealing step and the annular sealing surface matched with the circumferential surface of the front hub are arranged on the front guard plate, so that the backflow passage of fluid from the impeller outlet to the impeller inlet is blocked radially, the fluid leakage is reduced, and the sealing performance and the working efficiency of the submersible sewage pump are improved.

Inventors

  • MIAO BIN
  • JIANG GUANGWEN
  • XU XIAOFENG
  • LIU YANBIN
  • MENG XIANGYI
  • LI TIEFENG
  • YANG ZHIGUO
  • XUE YONGQING
  • GAO XINHAI
  • ZHANG LIN
  • Lei Wanyun

Assignees

  • 中铁十八局集团有限公司

Dates

Publication Date
20260512
Application Date
20250529

Claims (10)

  1. 1. The radial sealing structure based on the front guard plate of the submersible sewage pump comprises a volute (3), an impeller (2) and a front guard plate (4), wherein the front guard plate (4) is fixed on the front end face of the volute (3) through bolts, and the impeller (2) is arranged in the volute (3), and is characterized in that the impeller (2) is provided with a front hub extending towards the front guard plate (4), one side of the front guard plate (4) facing towards the front hub is provided with a sealing step, and the sealing step is provided with an annular sealing surface (14) matched with the circumferential surface of the front hub; The sealing step also has a rear axial end face (15) axially non-contacting the front hub, a non-contact axial gap (16) being formed between the rear axial end face (15) and the front axial end face of the front hub.
  2. 2. A submersible sewage pump front fender based radial seal structure according to claim 1, characterized in that the front fender (4) and the front hub have a radial gap of 0.1-0.3mm in width, and the non-contact axial gap (16) has a width of 0.5-1mm.
  3. 3. A submersible sewage pump front fender based radial seal arrangement according to claim 1, characterized in that the length of the annular sealing surface (14) in the axial direction is greater than the length of the rear axial end face (15) in the radial direction.
  4. 4. The radial sealing structure based on the front guard plate of the submersible sewage pump according to claim 1 is characterized in that a limiting step (13) is arranged between the front end curved surface (11) of the impeller (2) and the circumferential surface of the front hub, and an avoidance annular groove (12) for avoiding the limiting step (13) is arranged on the rear end curved surface (10) of the front guard plate (4).
  5. 5. The submersible sewage pump front guard based radial sealing structure according to claim 4, wherein the avoidance groove (12) has a first side wall (17) perpendicular to the circumferential surface of the front hub, and a safety gap is provided between the first side wall (17) and the axial end surface of the limit step (13), and the width of the safety gap is larger than the width of the non-contact axial gap (16).
  6. 6. The submersible sewage pump front guard-based radial sealing structure according to claim 4, wherein a non-contact annular gap (9) which does not interfere with rotation of the impeller (2) is formed between a front end curved surface (11) of the impeller (2) and a rear end curved surface (10) of the front guard (4).
  7. 7. A submersible sewage pump front guard based radial sealing arrangement according to claim 1, characterized in that the front guard (4) further has a positioning step abutting the volute (3) with a first axial end face (7) axially abutting the volute (3) and a first radial end face (6) radially abutting the volute (3).
  8. 8. A submersible sewage pump front guard based radial sealing arrangement according to claim 7, characterized in that the first radial end face (6) is provided with an annular groove, in which a sealing ring (8) is arranged.
  9. 9. A submersible sewage pump front fender based radial seal arrangement according to claim 1, characterized in that the inlet diameter of the impeller (2) decreases gradually from outside to inside.
  10. 10. A submersible sewage pump front fender based radial seal arrangement according to claim 9, characterized in that the inlet diameter of the front fender (4) decreases gradually from the outside to the inside.

Description

Radial sealing structure based on front guard plate of submersible sewage pump Technical Field The utility model belongs to the technical field of submersible pumps, and particularly relates to a radial sealing structure based on a front guard plate of a submersible sewage pump. Background The submersible sewage pump is particularly suitable for conveying liquid containing hard solids and fiber and particularly dirty, sticky and slippery liquid, is widely applied to conveying various domestic sewage, industrial wastewater, building site drainage, liquid feed and the like, and plays an important role in various industries such as municipal engineering, industry, hospitals, buildings, restaurants, water conservancy construction and the like. The submersible sewage pump mainly comprises an impeller, a motor, a volute, a front guard plate and a rear guard plate, and as the submersible sewage pump is possibly applied to severe working conditions such as high temperature, high pressure, pollution and the like, sediment or sewage can enter the motor due to poor sealing, the motor and a bearing are damaged, and the service life and reliability of equipment are affected. The front guard plate and the rear guard plate form a primary sealing structure of the motor, the front guard plate is positioned at the inlet side of the impeller and forms axial clearance seal with the impeller to prevent large particles from entering a sealing area, and the rear guard plate is positioned at the back of the impeller and forms axial clearance seal with the impeller to reduce leakage of high-pressure liquid to the motor side. The primary sealing structure of the submersible sewage pump has the defect that the front guard plate and the impeller are only sealed through an axial gap, so that fluid is easily caused to flow back to the inlet of the impeller from the outlet of the impeller along the axial gap between the front guard plate and the impeller, and the efficiency of the pump body is reduced. Disclosure of utility model The embodiment of the utility model provides a radial sealing structure based on a front guard plate of a submersible sewage pump, which aims to solve the problem of low working efficiency of a pump body caused by fluid leakage and backflow through radial sealing between the front guard plate and an impeller. The technical scheme includes that the radial sealing structure based on the front guard plate of the submersible sewage pump comprises a volute, an impeller and a front guard plate, wherein the front guard plate is fixed on the front end face of the volute through bolts, the impeller is arranged in the volute, the impeller is provided with a front hub extending towards the front guard plate, one side of the front guard plate, facing towards the front hub, is provided with a sealing step, and the sealing step is provided with an annular sealing surface matched with the circumferential surface of the front hub; The sealing step is also provided with a rear axial end face which is axially non-contacted with the front hub, and a non-contact axial gap is formed between the rear axial end face and the front axial end face of the front hub. In one implementation, a radial gap with the width of 0.1-0.3mm is arranged between the front guard plate and the front hub, and the width of the non-contact axial gap is 0.5-1mm. In one possible embodiment, the annular sealing surface has a length in the axial direction that is greater than the length in the radial direction of the rear axial end face. In an implementation mode, a limiting step is arranged between the front end curved surface of the impeller and the circumferential surface of the front hub, and an avoidance annular groove for avoiding the limiting step is arranged on the rear end curved surface of the front guard plate. In one possible mode, the avoidance ring groove is provided with a first side wall perpendicular to the circumferential surface of the front hub, a safety distance is arranged between the first side wall and the axial end surface of the limiting step, and the width of the safety distance is larger than that of the non-contact axial gap. In one implementation, a non-contact annular gap is formed between the front end curved surface of the impeller and the rear end curved surface of the front guard plate, and the non-contact annular gap does not interfere with rotation of the impeller. In one implementation, the front guard plate further has a positioning step abutting the volute, the positioning step having a first axial end face axially abutting the volute and a first radial end face radially abutting the volute. In one implementation, the first radial end surface is provided with an annular groove, and a sealing ring is disposed in the annular groove. In one possible way, the inlet diameter of the impeller decreases gradually from outside to inside. In one possible implementation, the inlet diameter of the front guard plate gradually decrease