CN202076986U - Special frequency converter for constant voltage water supply machine - Google Patents
Special frequency converter for constant voltage water supply machine Download PDFInfo
- Publication number
- CN202076986U CN202076986U CN2011200813244U CN201120081324U CN202076986U CN 202076986 U CN202076986 U CN 202076986U CN 2011200813244 U CN2011200813244 U CN 2011200813244U CN 201120081324 U CN201120081324 U CN 201120081324U CN 202076986 U CN202076986 U CN 202076986U
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- frequency
- water supply
- insulated gate
- gate bipolar
- bipolar transistors
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Abstract
The utility model discloses a special frequency converter for a constant voltage water supply machine. The special frequency converter comprises an AC rectification circuit, a DC frequency conversion circuit, a high-speed processor and a control panel, wherein the AC rectification circuit is a three-phase AC rectifier bridge composed of diodes, two ends of the three-phase AC rectifier bridge are in parallel connection with two serially connected charging capacitors, an output end of the three-phase AC rectifier bridge is connected with a charging resistor, the charging resistor is in parallel connection with a contactor, the two serially connected charging capacitors are in parallel connection with three groups of insulated gate bipolar transistors, each group comprises two insulated gate bipolar transistors, connections between emitter electrodes and collector electrodes of the two insulated gate bipolar transistors of each group are outputted to a motor, base electrodes of the three groups are respectively connected with the high-speed processor, the control panel is provided with six relays, two relays compose one control structure to control operation of a water pump. The special frequency converter for a constant voltage water supply machine is convenient in speed regulation, high in work efficiency, economical and practical, and worth of popularizing and applying.
Description
Technical field
The utility model relates to the variable-frequency control technique field, specifically a kind of constant pressure water supply special converter.
Background technology
Water system is an indispensable important ring in the national product life.Traditional water supply mode floor space is big, and water quality is easily polluted, and capital expenditure is many, can not keep constant and topmost shortcoming is a hydraulic pressure, causes the equipment component can not be normal.Variable-frequency control technique is a kind of alternating current machine stepless time adjustment technology of novel maturation, and it is widely used in the speed control field, particularly water supply industry with its unique fine control performance.But what most equipment manufacturer still adopted is the constant pressure water supply mode that falls behind, and promptly water pump of a Frequency Converter Control according to the pressure feedback model, is adjusted the frequency converter output frequency automatically by the PID computing.This control mode can reach the order ground of constant pressure water supply, but has caused the wasting of resources, is unfavorable for that device fabrication producer saves production cost.
The utility model content
The purpose of this utility model just provides a kind of frequency converter that is exclusively used in the constant pressure water supply industry, adopt frequency control way to carry out constant pressure water supply, many the shared frequency converters of water pump, water pump is arranged to variable frequency pump, general pump and dormancy pump, according to pressure feedback signal, automatically adjust the frequency converter output frequency and startup stops water pump by the PID computing,, finally reach the order ground of pipe network constant pressure to reach the order ground that changes motor speed and operation water pump number.
The technical scheme that realizes above-mentioned technical problem employing is as follows:
Constant pressure water supply machine special converter, comprise ac rectifier, DC frequency-changing circuit and high speed processor, described ac rectifier is the three-phase alternating current rectifier bridge that diode is formed, the charging capacitor of the two ends of described three-phase alternating current rectifier bridge two series connection in parallel, and output termination one charging resistor of three-phase commutation bridge, a described charging resistor contactor in parallel, two charging capacitors of series connection, three groups of insulated gate bipolar transistors in parallel, every group comprises two insulated gate bipolar transistors, and the emitter of every group of two insulated gate bipolar transistors and collector electrode junction export motor to, and the base stage of three groups of insulated gate bipolar transistors is connected respectively to high speed processor.
Also include control board, six relays are arranged on the control board, two relays are formed the operation of a water pump of a control structure control, water pump is arranged to variable frequency pump, general pump and dormancy pump, many the shared frequency converters of water pump according to pressure feedback signal, are adjusted the frequency converter output frequency and startup stops water pump automatically by the PID computing, to reach the order ground that changes motor speed and operation water pump number, finally reach the order ground of pipe network constant pressure.
The beneficial effects of the utility model are: it is fast that speed is imitated in the response of the utility model frequency converter open and close machine, stable performance, and high efficiency, a frequency converter can be controlled the operation of many water pumps, and economic and practical is strong.
Description of drawings
Fig. 1 is the utility model principle schematic
Fig. 2 is the utility model control board one control three electrical schematics
Embodiment
The utility model is described in further detail with embodiment below in conjunction with accompanying drawing.
As Fig. 1, shown in Figure 2, the utility model constant pressure water supply machine special converter, comprise ac rectifier, DC frequency-changing circuit and high speed processor, described ac rectifier is the three-phase alternating current rectifier bridge that diode is formed, the charging capacitor of the two ends of described three-phase alternating current rectifier bridge two series connection in parallel, and the output of three-phase commutation bridge connects a charging resistor, a described charging resistor contactor in parallel, two charging capacitors of series connection, three groups of insulated gate bipolar transistors in parallel, every group comprises two insulated gate bipolar transistors, and the emitter of every group of two insulated gate bipolar transistors and collector electrode junction export motor to, and the base stage of three groups of insulated gate bipolar transistors is connected respectively to high speed processor.
Six relays are arranged on the control board, and two relays are formed the operation of a water pump of a control structure control, water pump are arranged to variable frequency pump, general pump and dormancy pump, many shared frequency converters of water pump.Every group of two relay distinguished corresponding power frequency contact and frequency conversion contact, three motors of three group relaies control, and every group of two relays only might an adhesive.Suppose frequency conversion contact adhesive in first group relay, then first pump frequency conversion operation.If power frequency contact adhesive in first group relay, then first motor pressed power frequency operation directly by mains supply.
Having only a pump under each equipment running status is converting operation, and frequency is given by the frequency converter dominant frequency, and all the other pumps switch to power frequency operation or are in halted state.Ducted pressure is delivered in the frequency converter by pressure sensor, and frequency converter determines output frequency and each pump volume running status by the PID computing: need not the water pump increase pressure in pipeline, the dormancy pump is in resting state; If value of feedback=set point, then frequency converter keeps existing output; If value of feedback＞set point, then frequency converter reduces the number of output frequency or minimizing work water pump; If value of feedback＜set point, then frequency converter increases the number of output frequency or increase work water pump.
According to pressure feedback signal, adjust the frequency converter output frequency automatically and startup stops water pump by the PID computing, to reach the order ground that changes motor speed and operation water pump number, finally reach the order ground of pipe network constant pressure.
Because the water system characteristics are systems non-linear, big inertia, the pressure that wants to keep water supply network is constant, in the management of pipe network system, pressure transmitter has been installed according to the feedback theorem as feedback element, because the water system pipeline is long, caliber is big, the pressurising of pipe network is all slower, so system is a Large-lag System, be difficult for directly adopting the PID adjuster to control, and the mode that adopts PLC to participate in control realizes the control system regulating action.The utility model frequency converter has built-in PLC.
The foregoing description only as to explanation of the present utility model, limits the utility model never in any form.Identical or the equivalence techniques technical scheme that means obtain of every employing is all within the scope of the utility model rights protection.
Claims (2)
1. constant pressure water supply machine special converter, comprise ac rectifier, DC frequency-changing circuit and high speed processor, it is characterized by: described ac rectifier is the three-phase alternating current rectifier bridge that diode is formed, the charging capacitor of the two ends of described three-phase alternating current rectifier bridge two series connection in parallel, and the output of three-phase commutation bridge connects a charging resistor, a described charging resistor contactor in parallel, two charging capacitors of series connection, three groups of insulated gate bipolar transistors in parallel, every group comprises two insulated gate bipolar transistors, and the emitter of every group of two insulated gate bipolar transistors and collector electrode junction export motor to, and the base stage of three groups of insulated gate bipolar transistors is connected respectively to high speed processor.
2. a kind of constant pressure water supply machine special converter according to claim 1, it is characterized in that: many water pumps of described constant pressure water supply machine special converter control, having only a pump under each equipment running status is converting operation, frequency is given by the frequency converter dominant frequency, and all the other pumps switch to power frequency operation or are in halted state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200813244U CN202076986U (en) | 2011-03-24 | 2011-03-24 | Special frequency converter for constant voltage water supply machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200813244U CN202076986U (en) | 2011-03-24 | 2011-03-24 | Special frequency converter for constant voltage water supply machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202076986U true CN202076986U (en) | 2011-12-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200813244U Expired - Fee Related CN202076986U (en) | 2011-03-24 | 2011-03-24 | Special frequency converter for constant voltage water supply machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202076986U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086839A (en) * | 2017-05-26 | 2017-08-22 | 浙江大学 | The intelligent controller and its method supplied water for constant pressure frequency conversion |
-
2011
- 2011-03-24 CN CN2011200813244U patent/CN202076986U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086839A (en) * | 2017-05-26 | 2017-08-22 | 浙江大学 | The intelligent controller and its method supplied water for constant pressure frequency conversion |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Shanghai Zhongchen Electronic Technology Co., Ltd. Document name: Notification of Termination of Patent Right |
|
| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111214 Termination date: 20170324 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |