CN205858597U - Feed pump assembly - Google Patents
Feed pump assembly Download PDFInfo
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- CN205858597U CN205858597U CN201620790475.XU CN201620790475U CN205858597U CN 205858597 U CN205858597 U CN 205858597U CN 201620790475 U CN201620790475 U CN 201620790475U CN 205858597 U CN205858597 U CN 205858597U
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- rotating shaft
- feed pump
- pump assembly
- pump
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Abstract
This utility model provides a kind of feed pump assembly, including: main pump；First motor, the first motor is connected with main pump to drive main pump；Donkey pump；Second motor, the second motor is connected with donkey pump to drive donkey pump.The problem that this utility model efficiently solves the inconvenience that the rotating speed that a motor of the prior art adjusts main pump and donkey pump simultaneously is brought.
Description
Technical field
This utility model relates to the technical field of power plants generating electricity, in particular to a kind of feed pump assembly.
Background technology
Feed-water pump is auxiliary system important in thermal power plant, provides make-up water for boiler, ensures unit safety
Run.The power consumption of electrically driven feed pump system is the highest in set auxiliary machinery, and the ratio accounting for station service power consumption rate is the highest.Electrically driven feed pump
The connected mode of system mainly has following several:
As it is shown in figure 1, the rotating shaft of motor 3 is stretched out from two ends, the rotating shaft stretched out from the two ends of motor 3 is same
Axle, therefore, the rotating shaft rotating speed stretched out from the two ends of motor 3 is identical.One end of motor 3 is driven by fluid coupling 4 and gives
Water pump 2 rotates, and the other end of motor 3 drives fore pump 1 to rotate.In system operation, motor 3 constant-speed operation, feedwater
Pump 2 realizes variable-speed operation by fluid coupling 4 speed governing, to meet the requirement to feedwater of the unit different load.
Above-mentioned connected mode utilizes fluid coupling 4 to feed pump speed governing, can meet the operation under unit different load rate
Requirement, can obtain higher system effectiveness in the case of unit load rate height, but along with the reduction of unit load, feed pump turns
Prompt drop is low, fluid coupling 4 efficiency drastically declines, and energy waste ratio is more serious.It addition, the maintenance workload of fluid coupling 4
Greatly, maintenance cost high, scene there is also the problems such as greasy dirt.
As in figure 2 it is shown, the governing system of fluid coupling 4 is improved by some power plant, executor is utilized to make fluid power
The fixing state being operated in high transmission ratio (close to 1) of bonder 4, and it is equipped with converter 5 to motor speed adjusting.This connected mode
Solve the inefficient problem of fluid coupling 4, have certain energy-saving effect, but motor is in speed change duty (fall
Speed), fore pump reduction of speed the most in the lump, outlet pressure reduce, and bring cavitation hidden danger for feed pump.Therefore, this system limits
The minimum speed of motor is avoiding cavitation hazard.So, the speed adjustable range of motor is greatly affected.
As it is shown on figure 3, some power plant also use gearbox drive mode.Motor drags feedwater by gear-box 6 (speedup)
Pump operation (will bonder 4 be replaced by special gear box 6), is equipped with converter 5 to motor 3 speed governing.This system is abandoned
Bonder 4, eliminates equipment hydrodynamic transmission losses (but there is mechanical gearing losses), and system maintenance amount has reduced, but fore pump 1 is also
It is in fall-back state.For avoiding feed pump 2 cavitation hazard, motor 3 speed adjustable range is similarly subjected to the biggest impact.
Utility model content
Main purpose of the present utility model is to provide a kind of feed pump assembly, with solve of the prior art one electronic
Machine adjusts the inconvenient problem that the rotating speed of main pump and donkey pump is brought simultaneously.
To achieve these goals, this utility model provides a kind of feed pump assembly, including: main pump；First motor,
First motor is connected with main pump to drive main pump；Donkey pump；Second motor, the second motor is connected with donkey pump to drive
Donkey pump.
Further, main pump has the first rotating shaft；First motor has the second rotating shaft, the second rotating shaft and the first rotating shaft even
Connect；Donkey pump has the 3rd rotating shaft；Second motor has the 4th rotating shaft, the 4th rotating shaft and the 3rd rotating shaft and connects.
Further, feed pump assembly also includes the first shaft coupling, and the first rotating shaft and the second rotating shaft are by the first shaft coupling
Connect.
Further, the first shaft coupling is disengagable formula shaft coupling.
Further, feed pump assembly also includes that converter, converter and the first motor are connected electronic to control first
The rotating speed of machine.
Further, the first motor is asynchronous motor, and feed pump assembly also includes controller, controller and the first electricity
Motivation and converter connect with the rotating speed by Frequency Converter Control the first motor.
Further, the first motor is synchronous motor.
Further, feed pump assembly also includes that the second shaft coupling, the 3rd rotating shaft and the 4th rotating shaft are by the second shaft coupling
Connect.
Further, the rotating speed of the first motor is at more than 3000r/min.
Application the technical solution of the utility model, main pump and donkey pump use two different motor to drive respectively
Dynamic, the first motor-driven main pump, the second motor-driven donkey pump, technique scheme can be according to main pump and donkey pump institute
Two pumps is individually adjusted by the actual power needed, and this avoid in prior art and simultaneously drives two with a motor
During platform pump, the problem of the inconvenience that the rotating speed that motor adjusts main pump and donkey pump simultaneously is brought.
Accompanying drawing explanation
The Figure of description of the part constituting the application is used for providing being further appreciated by of the present utility model, this practicality
Novel schematic description and description is used for explaining this utility model, is not intended that improper restriction of the present utility model.
In the accompanying drawings:
Fig. 1 shows the schematic diagram of a kind of kind of drive of the feed pump assembly of prior art；
Fig. 2 shows feed pump assembly and the schematic diagram of converter of Fig. 1；
Fig. 3 shows the schematic diagram of feed pump another kind of drive of assembly of prior art；And
Fig. 4 shows the structural representation of the embodiment according to feed pump assembly of the present utility model.
Wherein, above-mentioned accompanying drawing includes the following drawings labelling:
1, fore pump；2, feed pump；3, motor；4, bonder；5, converter；6, gear-box；10, main pump；20, first
Motor；30, donkey pump；40, the second motor；50, the first shaft coupling；60, converter；70, the second shaft coupling.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Combination mutually.Describe this utility model below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
As shown in Figure 4, the feed pump assembly of the present embodiment includes: main pump the 10, first motor 20, donkey pump 30 and second
Motor 40.First motor 20 is connected with main pump 10 to drive main pump 10.Second motor 40 is connected to drive with donkey pump 30
Dynamic auxiliary pump 30.
The technical scheme of application the present embodiment, main pump 10 uses two different motor to drive respectively with donkey pump 30
Dynamic, the first motor 20 drives main pump 10, the second motor 40 to drive donkey pump 30, and technique scheme can be according to main pump 10
With the actual power required for donkey pump 30, two pumps is individually adjusted, this avoid in prior art with one electronic
When machine simultaneously drives two pumps, asking of the inconvenience that the rotating speed that motor adjusts main pump 10 and donkey pump 30 simultaneously is brought
Topic.
As shown in Figure 4, in the technical scheme of the present embodiment, main pump 10 has the first rotating shaft.First motor 20 has
Second rotating shaft, the second rotating shaft and the first rotating shaft connect.Donkey pump 30 has the 3rd rotating shaft.Second motor 40 has the 4th turn
Axle, the 4th rotating shaft and the 3rd rotating shaft connect.Said structure handling ease, easy for installation.
As shown in Figure 4, in the technical scheme of the present embodiment, feed pump assembly also includes the first shaft coupling 50, first turn
Axle and the second rotating shaft are connected by the first shaft coupling 50.By the first shaft coupling 50, first rotating shaft and the second rotating shaft are connected to one
Rising, the energy loss between such first motor 20 and main pump 10 is less, saves energy than the connected mode using bonder.
Specifically, the first shaft coupling 50 is disengagable formula shaft coupling.When the first rotating shaft of main pump 10 is stuck, the of the first motor 20
When two rotating shafts continue to bigger power to the first rotating shaft, the first rotating shaft or the second rotating shaft just have the danger of fracture.Due to
One rotating shaft and the second rotating shaft use disengagable formula shaft coupling, reach certain value when the second rotating shaft puts on the power of the first rotating shaft
Time, the second rotating shaft and the first rotating shaft will disengage, and thus effectively avoids the first rotating shaft or danger occurs in the second rotating shaft.When
So, as one skilled in the art will appreciate that the first shaft coupling 50 is that other protection type shaft coupling is also possible.When owing to being
Automatic starting protection function when the reasons such as system work is abnormal cause torque excessive, prevents the first rotating shaft or first electricity of main pump 10
Second rotating shaft of motivation 20 is destroyed.
As shown in Figure 4, in the technical scheme of the present embodiment, feed pump assembly also includes converter 60, converter 60 with
First motor 20 is connected with the rotating speed controlling the first motor 20.Specifically, the rotating speed of the first motor 20 is at 3000r/min
Above.Owing to the power of the first motor 20 self (is generally 1000m with the main pump flow of power plant relatively greatly3As a example by/h), therefore
The starting current of the first motor 20 is relatively big, and cable etc. is required higher relatively greatly by starting current.The use of converter 60 can be big
The starting current of big reduction the first motor 20, the requirement of such cable, lock etc. reduces the most accordingly.The use of converter 60
On the one hand reduce the excessive danger brought of starting current, on the other hand use the lower cable of grade, electric brake etc. to save
Substantial amounts of cost.
As shown in Figure 4, in the technical scheme of the present embodiment, the first motor 20 is asynchronous motor, feed pump assembly
Also include that controller, controller and the first motor 20 and converter 60 connect to control the first motor 20 by converter 60
Rotating speed.Feed pump assembly is equipped with speed feedback link, by the speed feedback signal of the first motor 20 to converter 60, is formed
Closed loop control to the first motor 20 rotating speed.Such as, when controller detects that main pump 10 needs to improve rotating speed, controller is given
Converter 60 carries high-revolving signal, so that the rotating speed of main pump 10 improves, otherwise when the rotating speed needing main pump 10 reduces, controls
Device controls converter 60 to reduce the rotating speed of main pump 10.Certainly, as one skilled in the art will appreciate that the first motor 20 is same
Step motor is also possible.
As shown in Figure 4, in the technical scheme of the present embodiment, feed pump assembly also includes the second shaft coupling 70, the 3rd turn
Axle and the 4th rotating shaft are connected by the second shaft coupling 70 device.Said structure is simple, cost is relatively low.Specifically, the second motor 40
For high-tension motor.High-tension motor means above the motor of 6000V.Second motor 40 can use high-tension motor to pass through
Shaft coupling is joined directly together with donkey pump 30, and the second motor 40 drives donkey pump 30 constant-speed operation.Certainly, as art technology
Personnel know, the second motor is that low-tension motor is also possible, it is however generally that low-tension motor is 380V.
In the feed pump assembly of the present embodiment, use the mode that shaft coupling is joined directly together, by the first motor and main pump
Connect, eliminate bonder, the mechanical driving device such as gear-box used in prior art.
As shown in Figure 4, the water inlet of the feed pump assembly main pump 10 of the present embodiment is provided by donkey pump 30.Main pump 10, first
Motor the 20, second motor 40 and donkey pump 30 may be installed on same installation foundation, it is possible to build different installations respectively
Basis is installed.
The feed pump assembly of the present embodiment has the advantage that
1, energy consumption is effectively reduced.This feed pump assembly has got rid of the mechanical driving device such as bonder, gear-box, decreases ring
Joint, improves operational efficiency, reduces energy consumption.
2, reliability is high.This feed pump assembly decreases transmission link, decreases event while raising efficiency, reduction energy consumption
Barrier point and maintenance, improve reliability.
3, the cavitation hidden danger of main pump 10 is thoroughly eliminated.This feed pump assembly is equipped with the second independent motor 40 constant speed and drags
Donkey pump 30, all can ensure the outlet pressure of donkey pump 30 under any operating mode of feed pump assembly, eliminates the cavitation of donkey pump 30
Hidden danger.
4, speed adjustable range is big, good energy-conserving effect.This feed pump assembly solves prior art when frequency control owing to keeping away
The problem that the motor minimum speed of exempting from cavitation hidden danger and cause is limited, can realize speed governing on a large scale, good energy-conserving effect.
5, reduce operation and maintenance expenses to use and workload.This feed pump assembly can be greatly reduced the operation and maintenance expenses of feed pump assembly and use and work
Measure, solve the on-the-spot problem such as noise, greasy dirt.
The foregoing is only preferred embodiment of the present utility model, be not limited to this utility model, for this
For the technical staff in field, this utility model can have various modifications and variations.All in spirit of the present utility model and principle
Within, any modification, equivalent substitution and improvement etc. made, within should be included in protection domain of the present utility model.
Claims (9)
1. a feed pump assembly, it is characterised in that including:
Main pump (10)；
First motor (20), described first motor (20) is connected with described main pump (10) to drive described main pump (10)；
Donkey pump (30)；
Second motor (40), described second motor (40) is connected with described donkey pump (30) to drive described donkey pump
(30)。
Feed pump assembly the most according to claim 1, it is characterised in that
Described main pump (10) has the first rotating shaft；
Described first motor (20) has the second rotating shaft, described second rotating shaft and described first rotating shaft and connects；
Described donkey pump (30) has the 3rd rotating shaft；
Described second motor (40) has the 4th rotating shaft, described 4th rotating shaft and described 3rd rotating shaft and connects.
Feed pump assembly the most according to claim 2, it is characterised in that described feed pump assembly also includes the first shaft coupling
(50), described first rotating shaft is connected by described first shaft coupling (50) with described second rotating shaft.
Feed pump assembly the most according to claim 3, it is characterised in that described first shaft coupling (50) is disengagable formula connection
Axial organ.
Feed pump assembly the most according to claim 1, it is characterised in that described feed pump assembly also includes converter
(60), described converter (60) be connected with described first motor (20) with control described first motor (20) rotating speed.
Feed pump assembly the most according to claim 5, it is characterised in that described first motor (20) is asynchronous electric
Machine, described feed pump assembly also includes controller, described controller and described first motor (20) and described converter (60)
Connect with the rotating speed being controlled described first motor (20) by described converter (60).
Feed pump assembly the most according to claim 1, it is characterised in that described first motor (20) is electronic for synchronizing
Machine.
Feed pump assembly the most according to claim 2, it is characterised in that described feed pump assembly also includes the second shaft coupling
(70), described 3rd rotating shaft and described 4th rotating shaft are connected by described second shaft coupling (70) device.
Feed pump assembly the most according to claim 1, it is characterised in that the rotating speed of described first motor (20) exists
More than 3000r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620790475.XU CN205858597U (en) | 2016-07-25 | 2016-07-25 | Feed pump assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620790475.XU CN205858597U (en) | 2016-07-25 | 2016-07-25 | Feed pump assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205858597U true CN205858597U (en) | 2017-01-04 |
Family
ID=57648930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620790475.XU Active CN205858597U (en) | 2016-07-25 | 2016-07-25 | Feed pump assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205858597U (en) |
-
2016
- 2016-07-25 CN CN201620790475.XU patent/CN205858597U/en active Active
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| GR01 | Patent grant |