CN-224228922-U - Stepped intermediate throttling seal of self-balancing multistage pump

CN224228922UCN 224228922 UCN224228922 UCN 224228922UCN-224228922-U

Abstract

The utility model provides a stepped intermediate throttle seal of a self-balancing multistage pump, wherein an intermediate throttle sleeve A (31) and an intermediate throttle sleeve B (32) are connected through a clamping groove structure, an O-shaped sealing ring is arranged at a matched position between the intermediate throttle sleeve A and the intermediate throttle sleeve B, an intermediate throttle sleeve (33) is fixed to a central hole of a water outlet section (4), a high-frequency pressure pulsation sensor (34) is arranged at a pressure pulsation measuring hole (331) of the intermediate throttle sleeve (33), a signal wire of each high-frequency pressure pulsation sensor (34) is connected with a controller (35) through the pressure pulsation measuring hole (331) of the intermediate throttle sleeve (33) and a sensor lead hole (45) of the water outlet section (4), and a signal wire at the output end of the controller (35) is connected with a transmitter arranged on the excircle of the water outlet section (4) through a lead hole (41) of the water outlet section. The structure can reduce the scouring and erosion damage of the high-pressure fluid medium to the middle throttling seal (3) and can monitor the sealing force of the sealing fluid in real time.

Inventors

WANG YANFENG
JIA JINGYI
LI BAOYI
PAN XIAOYANG

Assignees

河南工业大学

Dates

Publication Date: 20260512
Application Date: 20250630

Claims (4)

1. The stepped intermediate throttle seal of the self-balancing multistage pump comprises an intermediate throttle sleeve A (31), an intermediate throttle sleeve B (32), an intermediate throttle bushing (33), high-frequency pressure pulsation sensors (34) and a controller (35), and is characterized in that the intermediate throttle sleeve A (31) is arranged on one side of a low-pressure cavity (42) of a pump shaft and close to a water outlet section (4) through a flat key, the intermediate throttle sleeve B (32) is arranged on one side of a high-pressure cavity (43) of the pump shaft and close to the water outlet section (4) through a flat key, the intermediate throttle bushing (33) is fixed at a central hole of the water outlet section (4) through four screws at the end of the intermediate throttle bushing B (33), the high-frequency pressure pulsation sensors (34) are arranged on a pressure pulsation measuring hole (331) of the intermediate throttle bushing (33) and close to a sealing gap of the intermediate throttle seal (3), a signal line of each high-frequency pressure pulsation sensor (34) is connected with the controller (35) through the pressure pulsation measuring hole (331) of the intermediate throttle bushing (331) and a sensor lead hole (45) of the water outlet section (4) to the outer circle of the controller (4), and the signal line of the high-frequency pulsation sensor (34) is connected with the water outlet section (35) through the water outlet section (41) to the water outlet section (41).
2. The stepped intermediate throttle seal of the self-balancing multistage pump according to claim 1 is characterized in that an intermediate throttle sleeve A (31) and an intermediate throttle sleeve B (32) are connected through a clamping groove structure, an O-shaped sealing ring is arranged at a matched position between the intermediate throttle sleeve A (31) and the intermediate throttle sleeve B (32), the intermediate throttle sleeve A (31) and the intermediate throttle sleeve B (32) jointly form an intermediate throttle sleeve, the longitudinal cross section of the intermediate throttle sleeve A (31) and the outer circular surface of the intermediate throttle sleeve B (32) are respectively provided with a stepped structure, the stepped structures on the outer circular surface of the intermediate throttle sleeve A (31) and the stepped structures on the surface of the intermediate throttle sleeve B (32) are symmetrically arranged, and a cladding layer (321) is arranged at a radial matching surface of the intermediate throttle sleeve B (32) and the intermediate throttle sleeve B (33).
3. The stepped intermediate throttle seal of a self-balancing multistage pump according to claim 1, wherein the intermediate throttle bushing (33) is composed of two symmetrical parts, the longitudinal cross section of the intermediate throttle bushing (33) is L-shaped, the stepped structure is arranged in the inner hole of the intermediate throttle bushing (33), the stepped structure in the inner hole of the intermediate throttle bushing (33) is in a bilateral symmetry mode, and a plurality of pressure pulsation measuring holes (331) are formed in the outer circle surface of the intermediate throttle bushing (33).
4. The stepped intermediate throttle seal of a self-balancing multistage pump according to claim 1, wherein two sensor lead holes (45) are formed in the water outlet section (4), the two sensor lead holes (45) are symmetrically arranged left and right, one end of each sensor lead hole (45) is communicated with an inner hole of the water outlet section (4), and the other end of each sensor lead hole (45) is communicated with an inner cavity (44) of the water outlet section (4).

Description

Stepped intermediate throttling seal of self-balancing multistage pump Technical Field The utility model relates to the technical field of self-balancing multistage pump sealing, in particular to a stepped intermediate throttling seal of a self-balancing multistage pump. Background The self-balancing multistage pump adopts the mode of back-to-back arrangement of impellers, so that axial forces generated by the forward flow component and the reverse flow component can be mutually offset when the self-balancing multistage pump operates, and compared with the traditional multistage pump, the self-balancing multistage pump cancels an axial force balancing structure, can realize automatic balancing of axial thrust, and becomes key drainage equipment of a mine drainage system in China at present. The water outlet section of the self-balancing multistage pump is arranged at the middle position of the whole pump, and when the whole pump operates, the fluid medium pressure on two sides of the water outlet section is different, so that the fluid medium in the high-pressure cavity of the water outlet section is effectively prevented from flowing back into the low-pressure cavity of the water outlet section, a middle throttling sealing structure matched with a middle throttling shaft sleeve and a middle throttling bushing is generally adopted at present to serve as a sealing structure for isolating the high-pressure cavity and the low-pressure cavity of the water outlet section, and the sealing surface matched with the middle throttling shaft sleeve and the middle throttling bushing is mainly provided with smooth straight-through sealing, labyrinth sealing and spiral dynamic sealing. However, after the high-pressure fluid medium in the high-pressure cavity of the water outlet section enters the middle throttling sealing gap, the middle throttling sealing structure forms strong scouring and erosion phenomena, so that the failure speed of the middle throttling sealing structure is increased, and particularly when the number of stages of impellers of the self-balancing multistage pump is continuously increased, the pressure difference of the fluid medium at two sides of the water outlet section is gradually increased, the failure speed of the middle throttling sealing structure is further increased, the middle throttling sealing structure is used as a core key component of the self-balancing multistage pump, and the service life of the middle throttling sealing structure directly determines the service life of the whole self-balancing multistage pump. Therefore, according to the fundamental theory of fluid dynamics and the sealing mechanism of a sealing gap under the action of pressure difference, the development of the self-balancing multistage pump can effectively isolate the fluid medium at two sides of the water outlet section of the self-balancing multistage pump, and simultaneously reduce the flushing and erosion damage speed of the high-pressure fluid medium to the middle throttling sealing structure, so that the self-balancing multistage pump is a technical problem to be solved. In addition, along with the long-time operation of the self-balancing multistage pump, the sealing gap of the middle throttling sealing structure is gradually increased, so that a large amount of fluid medium in the high-pressure cavity of the water outlet section flows back into the low-pressure cavity of the water outlet section along the middle throttling sealing gap, the volume loss of the self-balancing multistage pump is increased, and the hydraulic efficiency of the whole pump is directly influenced. Therefore, the on-line detection of the size of the sealing gap of the intermediate throttling sealing structure of the self-balancing multistage pump is realized, the running state of the self-balancing multistage pump can be known in real time, data support can be provided for timely replacing the intermediate throttling sealing structure, the reduction of the hydraulic efficiency of the self-balancing multistage pump caused by the increase of the sealing gap of the intermediate throttling sealing structure is avoided, and technical support is provided for realizing energy conservation and consumption reduction of a mine drainage system. Disclosure of utility model Aiming at the technical problems, the utility model provides a stepped intermediate throttling sealing structure, which reduces the scouring and erosion damage of a high-pressure fluid medium to the intermediate throttling sealing structure through the alternate action of an axial sealing gap and a radial sealing gap, and adopts a high-frequency pressure pulsation sensor to monitor the sealing force of sealing fluid in the intermediate throttling sealing structure in real time. The technical scheme includes that the stepped intermediate throttle seal of the self-balancing multistage pump comprises an intermediate throttle sleeve A, an intermediate throttle sleeve B, an inte