CN218787186U

CN218787186U - Highly-integrated two-way pump set with planetary reduction gearbox connected in series

Info

Publication number: CN218787186U
Application number: CN202223094919.0U
Authority: CN
Inventors: 赵悦涵; 李长江; 曾建华; 闫佳佳
Original assignee: 704th Research Institute of CSIC
Current assignee: 704th Research Institute of CSIC
Priority date: 2022-11-22
Filing date: 2022-11-22
Publication date: 2023-04-04
Anticipated expiration: 2032-11-22

Abstract

The utility model relates to a high integration bigeminy pump package that planet reducing gear box is established ties, including high-speed pump impeller, low-speed pump impeller, the pump body, high-speed pump impeller, low-speed pump impeller install respectively in the high-pressure chamber and the low pressure intracavity of the pump body, and concatenate together through planet reducing gear box between high-speed pump impeller and the low-speed pump impeller and form high-speed pump and the integrated bigeminy pump overall structure of low-speed pump series connection. The utility model discloses a planet reducing gear box establishes ties high-speed pump and low-speed pump to integrate on a pump body, replace the connecting tube between the two pumps by the inside runner of the pump body, replaced the great in-line gear box of traditional volume weight simultaneously. Meanwhile, the size and the weight of the duplex pump set can be reduced, a pipeline system is simplified, a control strategy is optimized, and the maintainability is improved.

Description

Highly-integrated two-unit pump set with planetary reduction gearbox connected in series

Technical Field

The utility model relates to a single-stage pump series connection structure, two single-stage pump series connection structures of especially a high low-speed collocation.

Background

In order to achieve high cavitation resistance and high lift of conventional pump products, a low-speed multi-stage pump is often adopted, but under certain severe working conditions and installation conditions, the low-speed multi-stage pump is not suitable for use, under the circumstances, a series connection mode of 2 single-stage pumps matched at high and low speeds is often adopted, the cavitation resistance requirement is achieved by the preposed low-speed pump, cavitation is avoided under the severe pump inlet conditions, fluid pressurized by the low-speed pump is conveyed to the high-speed pump again, cavitation cannot occur, and the high-speed pump can output high lift without increasing stages and increasing the volume and weight.

At present, in order to realize the working mode, 2 pumps are often arranged in series, and the inlet and the outlet of the pump are connected through a pipeline, so that the mode can occupy more space and generate more pipe systems, and meanwhile, a certain control strategy is required to be adopted to realize synchronous working. In addition, under the condition that certain space is strictly limited, such as marine conditions, a dual pump set is often adopted, 1 low-speed pump and 1 high-speed pump are driven by a single-input dual-output in-line gearbox, and 2 pumps are arranged side by side and connected through a pipeline. Therefore, 2 pumps can work synchronously, certain space is saved, but the pumps are still connected through a pipeline, the power of the gear box is low, but the volume is large, and the structure is complex.

Disclosure of Invention

In order to realize high, low-speed pump series work, realize high anti-cavitation performance and high flow lift simultaneously, the utility model provides a high integration bigeminy pump package that planet reducing gear box is established ties through the planet reducing gear box, establishes ties high-speed pump and low-speed pump to the integration is on a pump body, replaces the connecting line between the two pumps by the inside runner of pump body, has replaced the great in-line gear box of traditional volume weight simultaneously. Meanwhile, the size and the weight of the duplex pump set can be reduced, a pipeline system is simplified, a control strategy is optimized, and the maintainability is improved.

In order to achieve the above purpose, the technical scheme of the utility model is that: a high-integration duplex pump set with planetary reduction boxes connected in series comprises a high-speed pump impeller, a low-speed pump impeller and a pump body, wherein the high-speed pump impeller and the low-speed pump impeller are respectively installed in a high-pressure cavity and a low-pressure cavity of the pump body, and the high-speed pump impeller and the low-speed pump impeller are connected in series through the planetary reduction boxes to form an integral structure of the high-speed pump and the low-speed pump integrated duplex pump in series.

Furthermore, the high-speed pump impeller is directly connected with the motor, and a mechanical seal is arranged at the connection position.

Furthermore, the input end of the planetary reduction gearbox is connected with a high-speed pump impeller through a high-speed magnetic coupling.

Furthermore, the output end of the planetary reduction box is connected with a low-speed pump impeller through a low-speed magnetic coupling.

Further, the low-speed pump impeller is supported by a low-speed pump front bearing and a low-speed pump rear bearing, a back opening ring is arranged to balance axial force, and residual axial force is offset by the low-speed pump rear bearing.

Further, the low-speed pump front bearing and the low-speed pump rear bearing are both water-lubricated bearings, and the low-speed pump rear bearing is a radial/axial combined bearing.

Furthermore, a high-pressure cavity sealing ring is arranged between the shell of the planetary reduction gearbox and the pump shell.

Furthermore, the planetary reduction gearbox is filled with circulating lubricating oil which is supplied by an external system, and the lubricating oil is fed and returned through two threaded joints to lubricate and cool the internal gear and the bearing.

Furthermore, the pump body is integrally cast with a high-speed pump and a low-speed pump, a flow channel is cast inside the pump body, the pump body is provided with two pump covers which respectively form a high-pressure cavity and a low-pressure cavity, and the two pump covers simultaneously provide fixing and supporting for the planetary reduction gearbox.

The beneficial effects of the utility model are that:

the utility model discloses a planet reducing gear box establishes ties high-speed pump and low-speed pump to integrate on a pump body, replace the connecting tube between the two pumps by the inside runner of the pump body, replaced the great in-line gear box of traditional volume weight simultaneously. Meanwhile, the size and the weight of the duplex pump set can be reduced, a pipeline system is simplified, a control strategy is optimized, and the maintainability is improved.

The utility model discloses compact structure, the integrated level is high, and control strategy is simple, can be used to carry condensate flow 465t/h, lift 120mH2O, pump package inlet pressure 0.02MPa (a), temperature 50 ℃, (cavitation surplus ~ 0.77mH2O) under the harsh operating mode. Compared with the traditional double pump set or a system with 2 pumps connected in series, the volume and the weight can be reduced by more than 50 percent.

Drawings

Fig. 1 is a structural schematic diagram of the highly integrated duplex pump set with the planetary reduction gearbox connected in series.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model discloses a high integration bigeminy pump package that planet reducing gear box is established ties, include: the mechanical seal comprises a mechanical seal 1, a high-speed pump impeller 2, a high-speed magnetic coupling 3, a planetary reduction gearbox 4, a low-speed magnetic coupling 5, a low-speed pump front bearing 6, a low-speed pump impeller 7, a low-speed pump rear bearing 8, a motor 9, a high-pressure cavity seal ring 10, a low-pressure cavity seal ring 11 and a pump body 12.

The mechanical seal 1, the high-speed pump impeller 2 and the high-speed magnetic coupling 3 are all arranged on a shaft of the motor 9, no additional bearing is needed for supporting, and the axial force of the mechanical seal is also born by the motor. The high-speed pump impeller 2 and the high-speed magnetic coupling 3 can be powered directly from the motor 9. The input end of the planetary reduction gearbox 4 is connected with the high-speed magnetic coupling 3 so as to obtain power, and because the magnetic coupling is provided with the shielding cover, fluid in the high-pressure cavity cannot enter the planetary reduction gearbox 4, and meanwhile, a high-pressure cavity sealing ring 10 is arranged between the shell of the planetary reduction gearbox 4 and the pump shell, the fluid cannot leak to the outside. The planetary reduction gearbox 4 is internally filled with circulating lubricating oil, the lubricating oil is supplied by an external system, and the lubricating and cooling of the internal gear and the bearing are realized by feeding and returning oil through two threaded joints. The output end of the planetary reduction box 4 is connected with the low-speed magnetic coupling 5, power is transmitted to the low-speed pump impeller 7, the low-speed pump impeller is enabled to run at a low speed, cavitation caused by low pressure of the inlet of the pump set is avoided, and meanwhile fluid pressure is improved and conveyed to the high-speed pump. The low-speed pump impeller 7 is supported by a low-speed pump front bearing 6 and a low-speed pump rear bearing 8, a back opening ring is arranged to balance axial force, and the residual axial force is counteracted by the low-speed pump rear bearing 8. The low-speed pump front bearing 6 and the low-speed pump rear bearing 8 are both water lubricated bearings, wherein the low-speed pump rear bearing 8 is a radial/axial combined bearing, the bearable axial force is limited, and if the bearing is used in the occasion with larger axial force, a thrust water lubricated bearing can be arranged at the low-speed magnetic coupling 5. The pump body 5 is a pump body of a high-speed pump and a low-speed pump, is integrally cast, is internally cast with a flow passage, and replaces a pipeline for connecting the high-speed pump and the low-speed pump. Meanwhile, the pump body 5 is provided with two pump covers which respectively form a high-pressure cavity and a low-pressure cavity, and the pump body is convenient to disassemble and assemble. The two pump covers simultaneously provide fixing and supporting for the planetary reduction gearbox 4, and after the two pump covers, the high-speed magnetic coupling 3 and the low-speed magnetic coupling 5 are disassembled, the planetary reduction gearbox 4 can be integrally disassembled for maintenance.

The utility model discloses install in the condensate system, by motor 9 simultaneous drive high-speed pump impeller 2 and low-speed pump impeller 7, can avoid the cavitation, carry the condensate of great flow and lift simultaneously. The whole equipment is combined through a mechanical structure, can be synchronously started and stopped, and has a simple control strategy.

The fluid conveyed by the pump set firstly enters the low-pressure cavity from the pump set inlet, is boosted by the low-speed pump impeller 7, then enters the high-pressure cavity through a low-speed pump impeller outlet-high-speed pump impeller inlet flow channel in the pump body, is boosted to a higher pressure by the high-speed pump impeller 2, and is output from the pump set outlet.

Claims

1. The utility model provides a high integration bigeminy pump package that planet reducing gear box is established ties, includes high-speed pump impeller, low-speed pump impeller, the pump body, its characterized in that: the high-speed pump impeller and the low-speed pump impeller are respectively arranged in a high-pressure cavity and a low-pressure cavity of the pump body, and the high-speed pump impeller and the low-speed pump impeller are connected in series through a planetary reduction gearbox to form a high-speed pump and low-speed pump series integrated dual pump integral structure.

2. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the high-speed pump impeller is directly connected with the motor, and a mechanical seal is arranged at the joint.

3. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the input end of the planetary reduction gearbox is connected with a high-speed pump impeller through a high-speed magnetic coupling.

4. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the output end of the planetary reduction gearbox is connected with a low-speed pump impeller through a low-speed magnetic coupling.

5. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the low-speed pump impeller is supported by a low-speed pump front bearing and a low-speed pump rear bearing, a back opening ring is arranged to balance axial force, and the residual axial force is offset by the low-speed pump rear bearing.

6. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the low-speed pump front bearing and the low-speed pump rear bearing are both water lubricated bearings, wherein the low-speed pump rear bearing is a radial/axial combined bearing.

7. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: and a high-pressure cavity sealing ring is arranged between the planetary reduction box shell and the pump shell.

8. The highly integrated two-in-one pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the planetary reduction gearbox is internally filled with circulating lubricating oil, the lubricating oil is supplied by an external system, and the lubricating and cooling of the internal gear and the bearing are realized by feeding and returning oil through the two threaded joints.

9. The highly-integrated two-unit pump set with planetary reduction boxes connected in series according to claim 1, is characterized in that: the pump body is the pump body of high-speed pump and low-speed pump of whole casting, and the inside is cast with the runner, and the pump body has two pump covers, forms high-pressure chamber and low-pressure chamber respectively, and two pump covers provide fixed and support for the planetary reduction box simultaneously.