CN202991525U - Frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system - Google Patents
Frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system Download PDFInfo
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- CN202991525U CN202991525U CN 201220610529 CN201220610529U CN202991525U CN 202991525 U CN202991525 U CN 202991525U CN 201220610529 CN201220610529 CN 201220610529 CN 201220610529 U CN201220610529 U CN 201220610529U CN 202991525 U CN202991525 U CN 202991525U
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Abstract
The utility model provides a frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system which comprises a feed pump, a hydraulic coupler, a feed pump motor and a booster pump which are connected in sequence. The feed pump motor is connected with a high-voltage frequency converter, and the booster pump is connected with a booster pump motor. The hydraulic coupler is connected with a newly-arranged oil pump or a newly-arranged power frequency operation small motor. The high-voltage frequency converter is arranged in an original system so as to achieve frequency modulation operation of the feed pump motor, the independent booster pump motor is additionally arranged on the booster pump so that output pressure of the booster pump can be effectively maintained, and the booster pump is enable not to be affected by rotation speed of the feed pump motor. The newly-arranged oil pump or the newly-arranged power frequency operation small motor is additionally arranged on the hydraulic coupler so as to solve the problem that outlet oil pressure of an internally-arranged oil pump of an original fluid coupler is low due to frequency control operation of the feed pump motor so that normal operation of the feed pump set can not be met.
Description
Technical field
The utility model relates to a kind of feed water pump group mechanical system, electrically driven feedpump group mechanical system after especially a kind of variable frequency energy saving reforming.
Background technique
Feed water pump is as the subsidiary engine of station capacity maximum, and its power consumption has accounted for 30% of power plant's power consumption rate, directly affects cost of electricity-generating, is necessary the electrically driven feedpump group is optimized transformation.
At present, the mode of energy-saving effect optimum is freguency control reform, briefly, increases exactly a high voltage converter, drives water supply pump motor, makes feed water pump frequency control of motor speed operation.
But, only increase a high voltage converter, normal operation that can not the safety assurance electrically driven feedpump.
Near the saturation temperature under this pressure, operating conditions is abominable due to the water temperature of entrance of water-supplying pump, is easy to vaporize, and for guaranteeing the safe operation of feed water pump, generally is the low speed front-mounted pump that feed water pump matching flow and feed water pump are complementary.Because the front-mounted pump rotating speed is low, anti-cavitation performance is good, and the feedwater of oxygen-eliminating device enters feed water pump after the front-mounted pump supercharging, has guaranteed enough net positive suction heads that boiler feed pump is required, thereby has greatly improved the performance of feed water pump anti-cavitation.
But in system, front-mounted pump is coaxial with water supply pump motor, so the front-mounted pump before Frequency Conversion Modification is according to constant speed operation design.After the main feed pump motor adopts frequency control of motor speed, when the rotating speed of water supply pump motor reduced, the rotating speed of coaxial front-mounted pump descended, and its outlet pressure also can reduce, possibly can't guarantee enough net positive suction heads that feed water pump is required when low speed, cause feed water pump cavitation damage equipment.Therefore, during the feed water pump Frequency Conversion Modification, must take the necessary measures to front-mounted pump, with guarantee feed water pump also can be safely when the converting operation state, operation reliably, cavitation can not appear.
Simultaneously, after the feed water pump Frequency Conversion Modification, the water supply pump motor variable-speed operation, when the feed water pump slow-speed of revolution, the rotating speed of the oil pump that is connected with driving shaft by gear mechanism in liquid coupling inside reduces on year-on-year basis, may cause outlet oil pressure low and can't satisfy the normal operation needs of feed water pump group, also must take corresponding modification measures.
The model utility content
For addressing the above problem, the utility model provides electrically driven feedpump group mechanical system after variable frequency energy saving reforming.
Realize electrically driven feedpump group mechanical system after the variable frequency energy saving reforming of the utility model purpose, comprise the feed water pump, hydraulic couplers, feed water pump motor and the front-mounted pump that connect successively.
Described feed water pump motor is connected with high voltage converter;
Described front-mounted pump is connected with the front-mounted pump motor;
Described hydraulic couplers is connected with new oil-adding pump or newly-increased power frequency operation small motor.
This patent is realized the frequency modulation operation of feed water pump motor by install high voltage converter additional in original system; By install independently front-mounted pump motor additional to front-mounted pump, can effectively keep the delivery pressure of front-mounted pump, make it not be subjected to the impact of water supply pump motor rotating speed; By install new oil-adding pump or newly-increased power frequency operation small motor additional to hydraulic couplers, solved the low problem that can't satisfy the normal operation needs of feed water pump group of the built-in oil pump outlet oil pressure of stoste coupling that causes because of water supply pump motor frequency control of motor speed operation.
Description of drawings
Fig. 1 is that after variable frequency energy saving reforming of the present utility model, electrically driven feedpump group mechanical system installs structural representation after high voltage converter additional;
Fig. 2 is a kind of structural representation after the front-mounted pump of electrically driven feedpump group mechanical system after variable frequency energy saving reforming of the present utility model installs the front-mounted pump motor additional;
Fig. 3 is the another kind of structural representation after the front-mounted pump of electrically driven feedpump group mechanical system after variable frequency energy saving reforming of the present utility model installs the front-mounted pump motor additional;
Fig. 4 is the front structural representation of hydraulic couplers transformation of electrically driven feedpump group mechanical system after variable frequency energy saving reforming of the present utility model;
Fig. 5 is that the hydraulic couplers of electrically driven feedpump group mechanical system after variable frequency energy saving reforming of the present utility model is cancelled crude oil pump, installed the structural representation after new oil-adding pump additional;
Fig. 6 is the structural representation after the hydraulic couplers of electrically driven feedpump group mechanical system after variable frequency energy saving reforming of the present utility model installs newly-increased power frequency operation small motor additional.
Embodiment
As shown in Figure 1, electrically driven feedpump group mechanical system after variable frequency energy saving reforming comprises the feed water pump 1, hydraulic couplers 2, feed water pump motor 4 and the front-mounted pump 5 that connect successively.
Described feed water pump motor 4 is connected with high voltage converter 3;
As shown in Figure 2, described front-mounted pump 5 is connected with front-mounted pump motor 6, and this front-mounted pump motor 6 is to be arranged in parallel with front-mounted pump 5;
As shown in Figure 3, described front-mounted pump 5 is connected with front-mounted pump motor 6, and this front-mounted pump motor 6 is and the coaxial setting of front-mounted pump 5;
As shown in Figure 4, in described hydraulic couplers 2, oil pump 11 is housed, its working principle is:
The water supply pump motor axle is connected with driving shaft 9 by coupling, through driving gear 10 and the 8 speedup rear driving pump impellers 15 of the driven gear on Pump wheel shaft 7 on driving shaft 9, change the work oil mass by scoop tube device 12, realize the variable-speed operation of turbine 14, and then the feed water pump variable-speed operation that is connected with turbine shaft 13 of drive;
It is inner that oil pump 11 is arranged on the liquid coupling, is connected with driving shaft 9 by gear mechanism, is used for providing system required work oil and lubrication oil;
As shown in Figure 5, described hydraulic couplers 2 is cancelled crude oil pump 11, is connected with new oil-adding pump 16;
As shown in Figure 6, described hydraulic couplers 2 keeps crude oil pump 11, is connected with newly-increased power frequency operation small motor 17.
This patent is realized the frequency modulation operation of feed water pump motor 4 by install high voltage converter 3 additional in original system; By installing independently front-mounted pump motor 6 additional for front-mounted pump 5, can effectively keep the delivery pressure of front-mounted pump 5, make it not be subjected to the impact of water supply pump motor 4 rotating speeds; By installing new oil-adding pump 16 or newly-increased power frequency operation small motor 17 additional for hydraulic couplers 2, solved the low problem that can't satisfy the normal operation needs of feed water pump group of the built-in oil pump outlet oil pressure of stoste coupling that causes because of water supply pump motor frequency control of motor speed operation.
Embodiment recited above is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; do not breaking away under the spiritual prerequisite of the utility model design; various distortion and improvement that the common engineers and technicians in related domain make technical solutions of the utility model all should fall in the definite protection domain of claims of the present utility model.
Claims (1)
1. electrically driven feedpump group mechanical system after variable frequency energy saving reforming, comprise the feed water pump, hydraulic couplers, feed water pump motor and the front-mounted pump that connect successively, described feed water pump motor is connected with high voltage converter, it is characterized in that, described front-mounted pump is connected with the front-mounted pump motor, and described hydraulic couplers is connected with new oil-adding pump or newly-increased power frequency operation small motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220610529 CN202991525U (en) | 2012-11-16 | 2012-11-16 | Frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220610529 CN202991525U (en) | 2012-11-16 | 2012-11-16 | Frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202991525U true CN202991525U (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220610529 Expired - Fee Related CN202991525U (en) | 2012-11-16 | 2012-11-16 | Frequency conversion and energy conservation modified electrically-driven feed pump set mechanical system |
Country Status (1)
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| CN (1) | CN202991525U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764000A (en) * | 2014-01-03 | 2015-07-08 | 施耐德电气（中国）有限公司 | Boiler water feeding system and method |
| CN106194640A (en) * | 2016-08-25 | 2016-12-07 | 俞朝富 | Boiler feed pump subsystem that pot-motor directly drives and the boiler feedwater pumping system of composition thereof |
| CN111794936A (en) * | 2020-08-13 | 2020-10-20 | 刘亚辉 | Method for changing steam feed pump system into full frequency-conversion high-rotation-speed electric feed pump system and brand new logic control system thereof |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113482900A (en) * | 2021-07-28 | 2021-10-08 | 西安热工研究院有限公司 | Non-coaxial steam-driven feed pump preposed pump speed regulating system under deep frequency conversion working condition |
-
2012
- 2012-11-16 CN CN 201220610529 patent/CN202991525U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764000A (en) * | 2014-01-03 | 2015-07-08 | 施耐德电气（中国）有限公司 | Boiler water feeding system and method |
| CN106194640A (en) * | 2016-08-25 | 2016-12-07 | 俞朝富 | Boiler feed pump subsystem that pot-motor directly drives and the boiler feedwater pumping system of composition thereof |
| CN111794936A (en) * | 2020-08-13 | 2020-10-20 | 刘亚辉 | Method for changing steam feed pump system into full frequency-conversion high-rotation-speed electric feed pump system and brand new logic control system thereof |
| CN113107832A (en) * | 2021-04-25 | 2021-07-13 | 西安热工研究院有限公司 | Method for testing characteristics of electric feed pump with spoon pipe for adjustment |
| CN113482900A (en) * | 2021-07-28 | 2021-10-08 | 西安热工研究院有限公司 | Non-coaxial steam-driven feed pump preposed pump speed regulating system under deep frequency conversion working condition |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130612 Termination date: 20131116 |