CN1065028C - NC serial operating mode change pump - Google Patents
NC serial operating mode change pump Download PDFInfo
- Publication number
- CN1065028C CN1065028C CN931150906A CN93115090A CN1065028C CN 1065028 C CN1065028 C CN 1065028C CN 931150906 A CN931150906 A CN 931150906A CN 93115090 A CN93115090 A CN 93115090A CN 1065028 C CN1065028 C CN 1065028C
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- China
- Prior art keywords
- pump
- motor
- main pump
- auxilliary
- input end
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Abstract
The present invention relates to a digital control serial connection varying duty pump, comprising a main pump, the motor of the main pump, an auxiliary pump, the motor of the auxiliary pump, a controllable frequency changer, etc. The present invention is characterized in that the input end of the motor of the main pump is connected with an industrial power supply network, the input end of the motor of the auxiliary pump is connected with the controllable frequency changer and driven by the controllable frequency changer, the motor of the auxiliary pump is a rare-earth permanent magnetic motor, and the output end of the auxiliary pump is connected with the input end of the main pump. Digital control frequency change technique is utilized for regulating the working condition of the auxiliary pump, the output of the whole pump set can be controlled via the Q-P characteristic of the main pump, expensive frequency change equipment with high power is not needed, and additional regulating energy consumption is little.
Description
A kind of NC serial operating mode change pump, it belongs to the large scale industry pump of may command output operating mode, be applicable to the various occasions that need the fluid delivery operating modes to regulate, be particularly suitable for by as if the large-sized boiler feed water pump that the match injection pump of oil-field flooding etc. need to regulate the industrial pump of output flow.
Present large scale industry pump generally all can not initiatively change operating mode.For satisfying to carrying the control of operating mode (flow and/or pressure), particularly to the control of flow, the throttling or the methods of flow spill valve of installing additional that adopt more.By changing the aperture of valve, come corresponding adjusting output operating mode.Though this controlling method is simple, easily to go, the equipment investment increase is seldom.But owing to have throttling or spill losses, the additional-energy consume is a lot of, and efficient is reduced.This is for the large scale industry pumping plant, and waste is surprising, generally reaches 30%, the recycle pump of 100,000 kilowatts of station boilers for example, and the additional energy consumption of the adjusting in 1 year just reaches 5.8 * 10
5Degree.Regulate for reducing additional energy consumption, now domesticly begin to adopt fluid torque converter to carry out operating mode control, it is added between drive motor and the pump input shaft, by control to fluid torque converter, and the driving moment and the rotating speed of change pump.Though use the fluid torque converter control work condition can reduce the additive regulating energy dissipation, generally can accomplish to add energy consumption and have only about 10%, cost has certain increase, and the maintenance workload of fluid torque converter is more.Along with the development of high-power frequency conversion technology, require the industrial pump of variable working condition individually, also have and adopt variable-frequency driving technique control variable working condition.Directly change the operating mode of drive motor by control break driving power frequency.This method can be reduced under 3% regulating additional energy consumption.But because the cost of high-power frequency conversion equipment is very high, technical difficulty is big.The relation of its price and output power is non-linear, and power is big more, and the cost increase of specific power is big more.The technical management of high-power frequency equipment and operation competency profiling are very high.Be difficult in now in the high-power industrial pump group and promote the use of.
The objective of the invention is to invent a kind of NC serial operating mode change pump, it can use numerical control directly to change the output operating mode of pump, and has only additional energy consumption of very little adjusting and less cost to increase.
The present invention has main pump, main pump motor, auxilliary pump, auxilliary pump motor, controllable frequency converter, standard industrial control, central control computer, central control computer links to each other with standard industrial control by the standard serial communication interface, in standard industrial control, be inserted with and link to each other with controllable frequency converter and its control adapter module of controlling, it is characterized in that: the main pump motor input end links to each other with the industrial power supply electrical network, auxilliary pump motor input end links to each other with controllable frequency converter, and drive by controllable frequency converter, auxilliary pump motor is a rare-earth permanent-magnet electric machine, and auxilliary delivery side of pump links to each other with the main pump input end.
Accompanying drawing 1 is a structural representation of the present invention.It has main pump 1, main pump motor 2, auxilliary pump 3, auxilliary pump motor 4, controllable frequency converter 5, standard industrial control 6, central control computer 7, central control computer 7 links to each other with standard industrial control 6 by the standard serial communication interface, in standard industrial control 6, be inserted with and link to each other with controllable frequency converter 5 and its control adapter module of controlling 8, it is characterized in that: main pump motor 2 input ends link to each other with the industrial power supply electrical network, auxilliary pump motor 4 input ends link to each other with controllable frequency converter 5, and by controllable frequency converter 5 drivings, auxilliary pump motor 4 is a rare-earth permanent-magnet electric machine, and the output terminal of auxilliary pump 3 links to each other with main pump 1 input end.
Accompanying drawing 2 is discharge capacity-lift (pressure) performance diagram of main pump 1.
Accompanying drawing 3 is discharge capacity-lift (pressure) performance diagram of auxilliary pump 3.
Working principle of the present invention is as follows, the input end of main pump 1 is linked to each other with auxilliary pump 3, provide main pump 1 needed back pressure by auxilliary pump 3, satisfy main pump 1 and reach the requirement that sucks lift, during this also adopts in general large scale industry pump more, between the lift ratio of main pump 1 and auxilliary pump 3 is generally between 1: 5 to 1: 20, be the best with 1: 10 generally, their capacity rating is identical.Main pump 1 is driven by the common main pump motor 2 that is connected to electrical network, its initiatively variable working condition, but because main pump 1 is not constant speed work, it has output characteristic as shown in Figure 2.Accompanying drawing 2 has provided Q-P (discharge capacity-pressure) characteristic curve of main pump 1, from accompanying drawing 2 as can be seen, when the main pump lift from P
1To P
1After having changed △ P, discharge capacity also will be from Q
1To Q
1Change △ Q, that is: pressure descends, and discharge capacity increases.Therefore it can passive change operating mode.In the present invention, auxilliary pump motor 4 links to each other with controllable frequency converter 5 and is driven by it.By the output frequency of controllable method change controllable frequency converter 5, just can initiatively change the output speed of auxilliary pump motor 4.Because main pump 1 and auxilliary pump 3 are contacted, so their discharge capacity is equal, and equals actual displacement.The output lift is two pumping head sum (P
1+ P
2).When external load (pressure) is constant, initiatively change the rotating speed of auxilliary pump motor 4, from n
1Become n
2, corresponding in its performance plot from curve Ln
1Become Ln
2Keep stagnation pressure constant, the dividing potential drop of its two pump is respectively from P
1And P
2Become P
1＇ and P
2＇ (P
1+ P
2=P
1＇+P
2＇).As can be seen from the figure, flow becomes Q ＇ from Q, has greatly changed.Therefore use smaller power controlling, can obtain bigger controlled flow.When extraneous flow was constant, the changing value of its pressure was the change value of pressure of auxilliary pump 3.
Control principle of the present invention is as follows:
When central control computer 7 according to program or when accepting extraneous change order request output flow, central control computer 7 sends by the standard serial communication interface that gating links to each other with controllable frequency converter 5 and to the address gating signal of its control adapter module of controlling 8.Standard industrial control after selecting signal with receiving, gating control corresponding adaptation module 8.Central control computer 7 is sent pairing controllable frequency converter 5 Control Parameter of new output flow that calculate behind the gating, is received and is latched by control adapter module 8.Control adapter module 8 is controlled the output frequency of frequency variator 5 to the signal that receives after the D/A conversion, thereby changes the output operating mode of defeated pump, reaches the purpose of control work condition.
Among the present invention, have only auxilliary pump motor 4 to use frequency conversion drive because the power of auxilliary pump 3 generally just 1/5 to 1/20 of main pump 1, so the power of variable-frequency power sources corresponding be not very big.Utilize the Q-H characteristic of main pump 1,, just can change main pump 1 operating mode, can reduce the cost of control apparatus, reduce operation and technical management requirement by controlling auxilliary pump 3 operating modes.
Among the present invention, the numerical control converter technique has been used in the control of operating mode, and main pump 1 no regulating and controlling, so its additive regulating energy consumption is very little.
The present invention adopts the numerical control converter technique pair auxilliary pump of connecting with main pump to carry out regulating working conditions, utilize the Q-H characteristic of main pump, realized output control to the entire pump group, because auxilliary pump power with respect to main pump is less, therefore its driving power is also less, do not need to adopt expensive high-power frequency conversion equipment, can reduce the control apparatus cost greatly.Simultaneously, owing to adopt the numerical control frequency conversion equipment to drive, and just drive auxilliary pump, so its additive regulating energy consumption is very little.
Among the present invention, main pump 1 and auxilliary pump 3 can typical turbine pumps (axial flow or centrifugal), also can adopt displacement pump (as worm pump, plunger pump etc.).For obtaining bigger flow control scope, main pump 1 can be selected the relatively pump of " firmly " (the lift change that the unit displacement variation causes is less) of output characteristic curve for use.
Among the present invention, main pump motor 2 can use common AC asynchronous motor, and the present invention does not have special wanting, and auxilliary pump motor 4 can adopt rare-earth permanent magnet rotor motor.This motor frequency variator and driving under very big rotary speed working scope and higher driving efficient are arranged.
In the present invention, standard industrial control 7 can be selected the I/O 32 of U.S. ME company (MECHATRONICEQUIPMENT INC.) for use, or the PB16AH of U.S. OPTO 22 companies.Central control computer 6 can be selected the LC4 controller of U.S. OPTO 22 companies for use, also can select the PCS-1 industrial process Control work station of U.S. ME company for use, can also select common PC computer for use.Adaptation module 8 can adopt the DF3 or the similar D/F modular converter of OPTO 22 companies.
Controllable frequency converter 6 among the present invention, can be to use the thyristor inversion power supply, it also can be the switch power of forming with the VMOS pipe, as the patent No. is that the CN90202757 and the patent No. are the patent of CN90203323, by variable ratio frequency changer pulse or rectangular wave drive, can also use the G7 series inverter of Japanese fuji company, the present invention does not have specific (special) requirements.
Claims (1)
1. NC serial operating mode change pump, it has main pump (1), main pump motor (2), auxilliary pump (3), auxilliary pump motor (4), controllable frequency converter (5), standard industrial control (6), central control computer (7), central control computer (7) links to each other with standard industrial control (6) by the standard serial communication interface, in standard industrial control (6), be inserted with and link to each other with controllable frequency converter (5) and its control adapter module of controlling (8), it is characterized in that: main pump motor (2) input end links to each other with the industrial power supply electrical network, auxilliary pump motor (4) input end links to each other with controllable frequency converter (5), and by controllable frequency converter 5 drivings, auxilliary pump motor (4) is a rare-earth permanent-magnet electric machine, and the output terminal of auxilliary pump (3) links to each other with main pump (1) input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN931150906A CN1065028C (en) | 1993-11-29 | 1993-11-29 | NC serial operating mode change pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN931150906A CN1065028C (en) | 1993-11-29 | 1993-11-29 | NC serial operating mode change pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1103466A CN1103466A (en) | 1995-06-07 |
| CN1065028C true CN1065028C (en) | 2001-04-25 |
Family
ID=4990786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN931150906A Expired - Fee Related CN1065028C (en) | 1993-11-29 | 1993-11-29 | NC serial operating mode change pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1065028C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964261A (en) * | 1974-01-24 | 1976-06-22 | International Harvester Company | Auxiliary hydraulic power circuit for a hydraulic power transmission system |
| EP0470459A1 (en) * | 1990-08-09 | 1992-02-12 | Siemens Aktiengesellschaft | Compressor |
-
1993
- 1993-11-29 CN CN931150906A patent/CN1065028C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964261A (en) * | 1974-01-24 | 1976-06-22 | International Harvester Company | Auxiliary hydraulic power circuit for a hydraulic power transmission system |
| EP0470459A1 (en) * | 1990-08-09 | 1992-02-12 | Siemens Aktiengesellschaft | Compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1103466A (en) | 1995-06-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| AR01 | Abandonment of patent right to avoid double patenting |
According to article 9 of the patent law and article 12 of the detailed rules for the implementation of the patent law: 93115090.6 of the invention patents in the current issue of authorization announcement, and at the same time corresponding to the 93245586.7 utility model patent to be given up, and in the 17 volume of the 17 issue of the new type of communique on the patent right to abandon the announcement. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |