CN102032161A

CN102032161A - Energy-saving control system of air compressor

Info

Publication number: CN102032161A
Application number: CN201010500025XA
Authority: CN
Inventors: 朱忠才
Original assignee: SHANGHAI SHANSHE ELECTRONICS TECHNOLOGY Co Ltd
Current assignee: SHANGHAI SHANSHE ELECTRONICS TECHNOLOGY Co Ltd
Priority date: 2010-10-08
Filing date: 2010-10-08
Publication date: 2011-04-27

Abstract

The invention discloses an energy-saving control system of an air compressor, comprising a primary line, a secondary line, a motor and a pressure conduit, wherein the primary line comprises elements, such as a three-phase supply incoming line and the like; a first port, a second port and a third port of the three-phase supply incoming line are connected with a corresponding first incoming line power supply terminal, a corresponding second incoming line power supply terminal and a corresponding third incoming line power supply terminal by a breaker; the first incoming line power supply terminal, the second incoming line power supply terminal and the third incoming line power supply terminal are connected with a first output port, a second output port and a third output port respectively by a three-phase rectifying circuit, an electrolytic capacitor filtering energy-storage circuit and an inverter circuit; the power lien of a pressure sensor is connected with a voltage terminal in a frequency converter; and the signal line of the pressure sensor is connected with a current analog quantity input port in the frequency converter; and a pressure port is connected with the pressure conduit. The energy-saving control system provided by the invention can carry out automatic regulation according to according to gas supply amount practically required by production, thus ensuring that gas for production has constant pressure and is stable.

Description

The energy-saving control system of air compressor

Technical field

The present invention relates to a kind of air compressor, particularly a kind of energy-saving control system of air compressor.

Background technique

Common air compressor is to make air compressor control the production system gas supply flow in the mode that loads, unload by opening and closing suction valve, and waste of energy surpasses 20% during air compressor no-load running, and the time of no-load running is long more, and waste of energy is just serious more.

When generally selecting air compressor for use, except considering maximum air consumption that production system needs when the full load condition, to consider that also certain surplus (10-20%) selectes the gas supply capacity of air compressor.Like this, not only when production gap and production task are little, make air compressor no-load running,, also air compressor no-load running can occur even in normal productive process because of gas supply capacity is superfluous.When air compressor no-load running, suction valve cuts out, and what this moment, motor was done is idle work.Owing to inevitably have air compressor no-load running, this moment, motor speed was constant, even air intake valve is closed, but the power of motor fall is smaller, adds reasons such as valve closing is not tight, and the power of motor waste is still serious.The no-load running time surpasses ten minutes in general one hour just the very big energy saving space.

In addition, frequently unload and load except meeting causes the pressure of whole gas net and often change, can not keep constant working pressure, the frequent load variations of motor also can make the aging speed of motor own accelerate.And during the power frequency starting device, though be reduced-voltage starting, electric current is still excessive when starting, and the 4-6 that general inrush current is a rated operational current doubly can influence the safe operation of stable and other consumer of electrical network.Impact wearing and tearing also big, each bearing to motor itself are big, so the complete machine maintenance is big, cause shorten the working life of air compressor, and running noises is big.

Summary of the invention

Technical problem to be solved by this invention provides a kind of energy-saving control system of air compressor, and it can be regulated automatically according to the air demand of producing actual demand, eliminates the unloaded phenomenon of air compressor fully, guarantees that production usefulness gas constant voltage is stable.

For solveing the technical problem, the invention provides a kind of energy-saving control system of air compressor, it is characterized in that, it comprises circuit one time, secondary line, motor and pressure piping, one time circuit comprises the three phase mains inlet wire, circuit breaker, three-phase incoming power terminal, rectified three-phase circuit, electrochemical capacitor filtering accumulator, inverter circuit and three-phase output end, the three phase mains inlet wire comprises first port, second port, the 3rd port, three-phase incoming power terminal comprises the first incoming power terminal, the second incoming power terminal and the 3rd incoming power terminal, three-phase output end comprises first output port, second output port, the 3rd output port, first port of three phase mains inlet wire, second port, the 3rd port is by circuit breaker and the first corresponding incoming power terminal, the second incoming power terminal and the 3rd incoming power terminal connect, the first incoming power terminal, the second incoming power terminal, the 3rd incoming power terminal passes through rectified three-phase circuit respectively, electrochemical capacitor filtering accumulator, the inverter circuit and first output port, second output port, the 3rd output port connects, first output port, second output port, the 3rd output port is connected with motor, secondary line comprises pressure port, pressure transducer and frequency variator, the power line of pressure transducer is connected with voltage terminal in the frequency variator, the signaling line of pressure transducer is connected with current analog amount input port in the frequency variator, and pressure port is connected with pressure piping.

Positive progressive effect of the present invention is: maintenance period of the present invention prolongs, and reduces the machine halt trouble rate of producing.The present invention makes motor stepless speed regulation, and the noise of having demoted helps environmental protection, and the motor surface temperature descends.

Description of drawings

Fig. 1 is the theory diagram of the energy-saving control system of air compressor of the present invention.

Fig. 2 is the theory diagram of a circuit among the present invention.

Fig. 3 is the theory diagram of secondary line among the present invention.

Embodiment

Lift a preferred embodiment below, and come the clearer the present invention that intactly illustrates in conjunction with the accompanying drawings.

As shown in Figure 1, the energy-saving control system of air compressor of the present invention comprises circuit 1, secondary line 2, motor 4 and pressure piping 3 one time.As shown in Figure 2, one time circuit 1 comprises three phase mains inlet wire 11, circuit breaker 12, three-phase incoming power terminal 13, rectified three-phase circuit 14, electrochemical capacitor filtering accumulator 15, inverter circuit 16 and three-phase output end 17, three phase mains inlet wire 11 comprises first port (L1), second port (L2), the 3rd port (L3), three-phase incoming power terminal 13 comprises the first incoming power terminal (R), the second incoming power terminal (S) and the 3rd incoming power terminal (T), three-phase output end 17 comprises first output port (U), second output port (V), the 3rd output port (W), first port (L1) of three phase mains inlet wire 11, second port (L2), the 3rd port (L3) is by circuit breaker 12 and the first corresponding incoming power terminal (R), the second incoming power terminal (S) and the 3rd incoming power terminal (T) connect, the first incoming power terminal (R), the second incoming power terminal (S), the 3rd incoming power terminal (T) is respectively by rectified three-phase circuit 14, electrochemical capacitor filtering accumulator 15, inverter circuit 16 and first output port (U), second output port (V), the 3rd output port (W) connects.First output port (U), second output port (V), the 3rd output port (W) are connected with motor 4.As shown in Figure 3, secondary line 2 comprises pressure port 21, pressure transducer 22 and frequency variator 23, the power line of pressure transducer 22 is connected with voltage (24V) terminal in the frequency variator 23, the signaling line of pressure transducer 22 is connected with current analog amount input port in the frequency variator, and pressure port 21 is connected with pressure piping 3.

In this example, the final purpose of circuit and secondary line control is user's a pipeline pressure.Promptly by the cooperation of circuit and secondary line, making the air pressure in the pressure piping just is the pressure of user institute actual demand.The motor drives air compressor work of air compressor increases the pressure in the pressure piping.Pressure in the pressure piping directly is connected with secondary line, and the signal output part of secondary line is connected on again on circuit.

The system work process of present embodiment is: the three phase mains inlet wire is input to the power frequency three-phase electricity in circuit, after a circuit carries out frequency conversion, be added in the frequency conversion three-phase electricity on the motor and drive this motor operation, air compressor (air compressor) work increases the pressure in the pressure piping.Pressure piping is connected with secondary line, pressure in the pressure piping converts the electrical signal of the ducted pressure of representative pressure to by secondary line, this electrical signal is called " pressure feedback signal ", this electrical signal directly is connected on circuit, the work of a circuit of control changes the frequency of frequency conversion three-phase electricity, thereby changes the rotating speed of motor, change the size of the pressure in the pressure piping, make it to adapt in the desired pressure of user.

The three phase mains inlet wire is connected to the first incoming power terminal, the second incoming power terminal, the 3rd incoming power terminal of economizer by circuit breaker.The first incoming power terminal, the second incoming power terminal, the 3rd incoming power terminal carry out the filtering energy storage by the two ends that rectified three-phase circuit is added in electrochemical capacitor filtering accumulator, receive on first output port, second output port, the 3rd output port by inverter circuit then.After frequency variator powers on, three phase mains is added on the frequency variator through the three phase mains inlet wire, frequency variator work, threephase AC is after the rectification of frequency variator inside, filtering, inversion, the adjustable threephase AC of output frequency is added on the motor and the drive motor running through Out let, but the rotating speed of motor is that the output frequency of frequency variator is then determined by pressure feedback signal by the decision of the output frequency of frequency variator.In this simultaneously, the pressure port of pressure transducer is connected on user's the pressure piping and finds out pipeline pressure, the size of pressure converts the representative pressure size to through pressure transducer electrical signal passes to the current analog amount input port of frequency variator through signaling line, frequency variator is learnt the size of user's pressure according to current analog amount input port, compare with pressure set points, obtain deviation, through being integrated into processor DSP (DigitalSignal Processing, DSP digital signal processor) Nei Bu PID (Proportion-Integration-Differentiation, proportional-integral-differential) regulator calculates the frequency values that frequency variator acts on asynchronous motor, by the corresponding frequencies of frequency variator output and the Ac of amplitude, on motor, obtain corresponding rotating speeds, the pressurized air of air compressor output correspondence is to gas holder, make it variation in pressure, identical up to pipeline pressure with the setting pressure value, when the long-time gas consumption of production system less, economizer has software control to enter state of dormancy automatically, air compressor stops automatically, when system pressure drops to Minimum requirements pressure, the economizer state of resuming work again, air compressor be operation automatically again.

Though more than described the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, under the prerequisite that does not deviate from principle of the present invention and essence, can make numerous variations or modification to these mode of executions.Therefore, protection scope of the present invention is limited by appended claims.

Claims

1. the energy-saving control system of an air compressor, it is characterized in that, it comprises circuit one time, secondary line, motor and pressure piping, one time circuit comprises the three phase mains inlet wire, circuit breaker, three-phase incoming power terminal, rectified three-phase circuit, electrochemical capacitor filtering accumulator, inverter circuit and three-phase output end, the three phase mains inlet wire comprises first port, second port, the 3rd port, three-phase incoming power terminal comprises the first incoming power terminal, the second incoming power terminal and the 3rd incoming power terminal, three-phase output end comprises first output port, second output port, the 3rd output port, first port of three phase mains inlet wire, second port, the 3rd port is by circuit breaker and the first corresponding incoming power terminal, the second incoming power terminal and the 3rd incoming power terminal connect, the first incoming power terminal, the second incoming power terminal, the 3rd incoming power terminal passes through rectified three-phase circuit respectively, electrochemical capacitor filtering accumulator, the inverter circuit and first output port, second output port, the 3rd output port connects, first output port, second output port, the 3rd output port is connected with motor, secondary line comprises pressure port, pressure transducer and frequency variator, the power line of pressure transducer is connected with voltage terminal in the frequency variator, the signaling line of pressure transducer is connected with current analog amount input port in the frequency variator, and pressure port is connected with pressure piping.