CN215566718U - Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device - Google Patents

Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device Download PDF

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Publication number
CN215566718U
CN215566718U CN202120978586.4U CN202120978586U CN215566718U CN 215566718 U CN215566718 U CN 215566718U CN 202120978586 U CN202120978586 U CN 202120978586U CN 215566718 U CN215566718 U CN 215566718U
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China
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final
throttling
stage
impeller
bush
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CN202120978586.4U
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Inventor
胡二华
闫军沛
刘露
梁正军
冯立杰
王延锋
刘航
张世斌
代争争
张梦璐
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Henan Zheng Pump Technology Co ltd
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Henan Zheng Pump Technology Co ltd
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Abstract

The utility model discloses an online monitoring device for fit clearance between a throttling bush and a throttling shaft sleeve of a self-balancing multistage pump, which comprises a pump shaft (4), a final-stage positive impeller (3), a final-stage positive guide vane (2), a final-stage reverse impeller (6), a final-stage reverse guide vane (5), a water outlet section (1), a throttling bush (7), a throttling shaft sleeve (8), a wireless flowmeter (9) and a flow display screen, wherein the final-stage positive guide vane (2) is installed and fixed on one side of the water outlet section (1), the final-stage reverse guide vane (5) is installed and fixed on the other side of the water outlet section (1), the throttling bush (7) is fixedly installed at a central hole of the water outlet section (1) through a screw, the final-stage positive impeller (3) and the final-stage reverse impeller (6) are installed on the pump shaft (4) in a back-to-back manner through a flat key, the throttling shaft sleeve (8) is installed on the pump shaft (4) in a flat key connection manner and is positioned between the final-stage positive impeller (3) and the final-stage reverse impeller (6), the last-stage positive impeller (3) is arranged in an inner cavity of the last-stage positive guide vane (2), the last-stage reverse impeller (6) is arranged in an inner cavity of the last-stage reverse guide vane (5), a cylindrical hole is formed in the inner surface of the throttling bush (7) close to the last-stage positive impeller (3), the wireless flowmeter (9) is fixed in the cylindrical hole in the inner surface of the throttling bush (7), and the display screen is arranged in the pump room. The device can carry out on-line monitoring to the clearance size between throttle bush and the throttle sleeve to simple structure.

Description

Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device
Technical Field
The utility model relates to the technical field of self-balancing multistage centrifugal pumps, in particular to an online monitoring device for fit clearance between a throttling bush and a throttling shaft sleeve of a self-balancing multistage pump.
Background
The self-balancing multistage centrifugal pump mainly comprises a water inlet section, a middle section, a water outlet section, a secondary water inlet section, a positive guide vane, a negative guide vane, a positive impeller, a negative impeller, a pump shaft, a throttling part, a retaining sleeve, a transition pipe, a bearing body and other parts. In the operation process of the self-balancing multistage centrifugal pump, the pump shaft is driven by the motor to rotate to do work on the conveyed fluid, so that the energy of the conveyed fluid is increased, and the required amount of fluid is continuously sent out from the suction pool through the water inlet section, the positive impeller, the positive guide vane, the horizontal water outlet of the middle section and the water outlet section of the pump, the transition pipe, the secondary water inlet section, the reverse impeller, the reverse guide vane and the vertical water outlet of the water outlet section.
The impeller of the self-balancing multistage centrifugal pump is arranged symmetrically, namely the impellers of the multistage centrifugal pump are arranged on the pump shaft in a back-to-back manner, so that the water outlet section of the self-balancing multistage centrifugal pump mainly comprises a low-pressure cavity and a high-pressure cavity, and a large pressure difference exists between the high-pressure cavity and the low-pressure cavity, so that fluid on the side of the high-pressure cavity leaks to the side of the low-pressure cavity along an interstage seal gap, as a result, the pressure at the rear cover plate of the last-stage impeller on the low-pressure side is increased, and an additional axial force pointing to the suction side is generated.
In addition, in the operation process of the self-balancing multistage pump, the high-pressure cavity fluid of the water outlet section leaks to the low-pressure cavity along the interstage seal gap, namely a fluid leakage channel is formed by the gap between the throttling bush and the throttling shaft sleeve, and along with the scouring of the high-pressure fluid and the abrasion action of impurity particles between the throttling bush and the throttling shaft sleeve, the gap between the throttling bush and the throttling shaft sleeve is increased, so that the volume loss of the self-balancing multistage pump is further increased, and the operation efficiency of the whole pump unit is limited.
In order to solve the problems in the related art, no effective method is provided for online monitoring of leakage amount of a gap between a throttling bush and a throttling shaft sleeve of a self-balancing multistage pump, and an online monitoring device suitable for a fit gap between the throttling bush and the throttling shaft sleeve of the self-balancing multistage pump is urgently needed.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects, the utility model aims to provide the device for monitoring the fit clearance between the throttling bush and the throttling shaft sleeve of the self-balancing multistage pump on line.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows: an on-line monitoring device for the fit clearance between a throttling bush and a throttling shaft sleeve of a self-balancing multistage pump comprises a pump shaft, a last-stage positive impeller, a last-stage positive guide vane, a last-stage reverse impeller, a last-stage reverse guide vane, a water outlet section, a throttling bush, a throttling shaft sleeve, a wireless flowmeter and a flow display screen, wherein the last-stage positive guide vane is fixedly arranged at one side of the water outlet section, the last-stage reverse guide vane is fixedly arranged at the other side of the water outlet section, the throttling bush is fixedly arranged at the central hole of the water outlet section through a screw, the last-stage positive impeller and the last-stage reverse impeller are arranged on the pump shaft in a back-to-back manner through a flat key, the throttling shaft sleeve is arranged on the pump shaft in a flat key connection manner and is positioned between the last-stage positive impeller and the last-stage reverse impeller, the last-stage positive impeller is arranged in an inner cavity of the last-stage positive guide vane, and the last-stage reverse impeller is arranged in an inner surface of the throttling bush close to the last-stage positive impeller, the wireless flowmeter is fixed in the cylindrical hole of throttle bush internal surface, and the display screen is installed in the pump house.
The wireless flowmeter and the flow display screen transmit the fluid leakage amount of a gap between the throttling bush and the throttling shaft sleeve in a wireless connection mode, and the flow display screen displays the fluid flow information collected by the wireless flowmeter in real time.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
labeled as: 1: a water outlet section; 2: a final stage positive guide vane; 3: a final stage positive impeller; 4: a pump shaft; 5: a last stage back guide vane; 6: a final stage counter-impeller; 7: a throttle bushing; 8: a throttle bushing; 9: a wireless flow meter.
Detailed Description
One embodiment of the present invention is further described below with reference to FIG. 1:
the self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device comprises a pump shaft 4, a final stage positive impeller 3, a final stage positive guide vane 2, a final stage reverse impeller 6, a final stage reverse guide vane 5, a water outlet section 1, a throttling bush 7, a throttling bush 8, a wireless flowmeter 9 and a flow display screen, wherein the final stage positive guide vane 2 is installed and fixed on one side of the water outlet section 1, the final stage reverse guide vane 5 is installed and fixed on the other side of the water outlet section 1, the throttling bush 7 is fixedly installed at the central hole of the water outlet section 1 through a screw, the final stage positive impeller 3 and the final stage reverse impeller 6 are installed on the pump shaft 4 in a back-to-back manner through flat keys, the throttling bush 8 is installed on the pump shaft 4 in a flat key connection manner and is positioned between the final stage positive impeller 3 and the final stage reverse impeller 6, the final stage positive impeller 3 is installed in an inner cavity of the final stage positive guide vane 2, the final stage reverse impeller 6 is installed in an inner cavity of the final stage reverse guide vane 5, wherein, a cylindrical hole is arranged on the inner surface of the throttling bush 7 near the final-stage positive impeller 3 side, the wireless flowmeter 9 is fixed in the cylindrical hole on the inner surface of the throttling bush 7, and the display screen is arranged in the pump room.
The wireless flowmeter 9 and the flow display screen transmit the fluid leakage amount of the gap between the throttling bush 7 and the throttling bush 8 in a wireless connection mode, and the flow display screen displays the fluid flow information collected by the wireless flowmeter 9 in real time.

Claims (2)

1. An online monitoring device for the fit clearance of a throttling bush and a throttling shaft sleeve of a self-balancing multistage pump comprises a pump shaft (4), a final-stage positive impeller (3), a final-stage positive guide vane (2), a final-stage reverse impeller (6), a final-stage reverse guide vane (5), a water outlet section (1), a throttling bush (7), a throttling shaft sleeve (8), a wireless flowmeter (9) and a flow display screen, wherein the final-stage positive guide vane (2) is fixedly installed at one side of the water outlet section (1), the final-stage reverse guide vane (5) is fixedly installed at the other side of the water outlet section (1), the throttling bush (7) is fixedly installed at the central hole of the water outlet section (1) through a screw, the final-stage positive impeller (3) and the final-stage reverse impeller (6) are installed on the pump shaft (4) in a back-to-back manner through a flat key, the throttling shaft sleeve (8) is installed on the pump shaft (4) in a flat key connection manner and is positioned between the positive impeller (3) and the reverse impeller (6), the positive impeller (3) of final stage is installed in the inner chamber of the positive stator (2) of final stage, and the negative impeller (6) of final stage is installed in the inner chamber of the negative stator (5) of final stage, its characterized in that: a cylindrical hole is formed in the inner surface of the throttling bush (7) close to the last-stage positive impeller (3), the wireless flowmeter (9) is fixed in the cylindrical hole in the inner surface of the throttling bush (7), and the display screen is installed in the pump room.
2. The on-line monitoring device for the fit clearance between the self-balancing multistage pump throttling bush and the throttling bush as recited in claim 1, wherein: the wireless flowmeter (9) and the flow display screen transmit the fluid leakage amount of the gap between the throttling bush (7) and the throttling shaft sleeve (8) in a wireless connection mode, and the flow display screen displays the fluid flow information collected by the wireless flowmeter (9) in real time.
CN202120978586.4U 2021-05-10 2021-05-10 Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device Active CN215566718U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120978586.4U CN215566718U (en) 2021-05-10 2021-05-10 Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120978586.4U CN215566718U (en) 2021-05-10 2021-05-10 Self-balancing multistage pump throttling bush and throttling bush fit clearance on-line monitoring device

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CN215566718U true CN215566718U (en) 2022-01-18

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059639A (en) * 2022-06-17 2022-09-16 上海凯泉泵业(集团)有限公司 Final-stage guide vane structure applicable to multi-stage pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115059639A (en) * 2022-06-17 2022-09-16 上海凯泉泵业(集团)有限公司 Final-stage guide vane structure applicable to multi-stage pump

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