CN202117120U - Multi-pump constant-pressure water supplying control device - Google Patents

Abstract

The utility model relates to a multi-pump constant-pressure water supplying control device, which comprises a plurality of frequency converters, a temperature sensor, a direct-current voltage sensor, an output current sensor, a switch frequency detector of an electrical semi-conductor switch, a pressure sensor on a water output pipe of the water pumps, a plurality of auxiliary control devices and a system master control device, wherein the frequency converters correspond to water pumps one by one, and the temperature sensor, the direct-current voltage sensor and the output current sensor are used for detecting the converters. The auxiliary control devices correspond to the converters one by one, and the master control device receives information outputted by an energy consumption calculating module of each converter of each auxiliary control device and inputs proper running modes to the corresponding auxiliary control devices to control running of the water pumps. The multi-pump constant-pressure water supplying control device has the following advantages that loss and accumulative total loss of each converter are calculated according to the characteristics of environmental temperature, running states and output current of each converter and electric frequency of the switch and the like, fatigue degree of each converter is reflected, the converters can be used evenly and the service life of the system is prolonged evidently.

Description

Many pumps constant pressure water supply control device

Technical field:

The utility model relates to a kind of waterworks, especially relates to a kind of many pumps constant pressure water supply control device.

Background technology:

In the prior art, constant pressure frequency conversion system major part is through recording exit of pump pipeline upward pressure, and this pressure and setting pressure are relatively joined through water pump that the revolution of frequency converter control of pump realizes in the back.The operational mode of a this control one can prevent the moment overcurrent, also can control the export pipeline upward pressure accurately.Its weak point is; Under the operating condition of many pump assemblys, switch board is according to the quantity of water pump frequency converter to be installed, and vibrations and electromagnetism directly are communicated to frequency converter and play back reaction during operation; It is very complicated that the winding displacement of frequency converter can become; The heat radiation of each frequency converter is uneven, its degree of fatigue has nothing in common with each other, and these life-spans that can produce frequency converter are uneven, thereby causes the cost of whole system to rise.

The utility model content:

The purpose of the utility model is to the prior art weak point a kind of many pumps constant pressure water supply control device to be provided.This device can calculate the power consumption of each frequency converter according to information such as the ambient temperature of each frequency converter, operation conditions, output current, switching devices, calculates energy-conservation, the pump variable frequency control device of control automatically that the electric consumption of accumulative total comes alternate run.

The purpose of the utility model is to realize through following measure: a kind of many pumps constant pressure water supply control device; It comprises several and water pump frequency converter one to one, and detects the temperature pick up of this frequency converter, the DC voltage sensor of frequency converter, the output current sensor of frequency converter, the switching frequency detector of power semiconductor switches; Pressure sensor on the water pump output water pipe; It is characterized in that also having some sub-control devices, system master system device; Wherein:

Said some sub-control devices are corresponding one by one with said frequency converter; The sub-control device is made up of V/F converter, PWM controller, 3 phases/2 phase converter, frequency converter energy input computing module; The V/F converter output end connects PWM controller input; The PWM controller output end connects corresponding Frequency Converter Control input; The output current sensor output termination 3 phases/2 phase converter inputs of frequency converter; The switching frequency detector output end of 3 phases/2 phase converter outputs, V/F converter output end, temperature pick up output, DC voltage sensor output, power semiconductor switches connects frequency converter energy input computing module input; The output that V/F converter input welding system main control unit alternate run module is corresponding, frequency converter energy input computing module output welding system main control unit alternate run module corresponding input end;

Said system master system device is made up of PID controller, alternate run module; Pressure sensor on the input water pump output water pipe of PID controller; The output termination alternate run module input of PID controller; The frequency converter energy input computing module output welding system main control unit alternate run module corresponding input end of sub-control device, the input of the V/F converter of the corresponding sub-control device of main control unit alternate run module output termination.

Said several and water pump frequency converter one to one are placed on the heat sink jointly.

Compared with prior art; The many pumps constant pressure water supply control device that has adopted the utility model to propose; Have following advantage: 1) a plurality of frequency converter modules are installed on the heat liberation board, and frequency converter moves on big relatively heat liberation board, good heat dissipation effect; Frequency converter module damage ratio reduces, and overall system efficiency has increased; 2) littler than prior art one control one frequency conversion system entire area, the electrical equipment winding displacement is also simple, and the vibrations of water pump or electromagnetic interference also obviously reduce, and have obtained the reliability of constant pressure frequency conversion system; 3) according to characteristics such as the environment temperature of each frequency converter, operation conditions, output current, the electric frequencies of switch; Calculate each frequency converter loss amount and accumulating losses amount; The fatigue strength that reflects each frequency converter is used the frequency converter equalization life-span of obviously having improved system.

Description of drawings:

Fig. 1 is the embodiment system schematic that the utility model proposes.

Fig. 2 is Fig. 1 embodiment control device functional-block diagram.

The specific embodiment:

Below in conjunction with accompanying drawing the specific embodiment is elaborated: in an embodiment system schematic of the utility model shown in Figure 1.Among the figure, the embodiment system comprises input power supply 1, control device 2, water pump output siphon pressure sensor 3, water pump 4.

Fig. 2 is an embodiment control device functional-block diagram, among the figure, and a kind of many pumps constant pressure water supply control device; It comprises: several and water pump 4 be frequency converter 21 one to one; And detect the temperature pick up 22 of this frequency converter, the DC voltage sensor 23 of frequency converter, the output current sensor 24 of frequency converter, the switching frequency detector of frequency converter device for switching spare, the pressure sensor 3 on the water pump 4 output water pipes; Some sub-control devices, system master system device.Wherein:

Said some sub-control devices are corresponding one by one with said frequency converter 21; The sub-control device is made up of V/F converter 25, PWM controller 26,3 phases/2 phase converter 27, frequency converter energy input computing module 28; V/F converter 25 output termination PWM controllers 26 inputs; The corresponding Frequency Converter Control input of PWM controller 26 output terminations; Output current sensor 24 output terminations 3 phases/2 phase converter, 27 inputs of frequency converter; The switching frequency detector output end of 3 phases/2 phase converter, 27 outputs, V/F converter 25 outputs, temperature pick up 22 outputs, DC voltage sensor 23 outputs, power semiconductor switches connects frequency converter energy input computing module 28 inputs; The output of V/F converter 25 input welding system main control unit alternate run modules 30 correspondences, frequency converter energy input computing module 28 output welding system main control unit alternate run modules 30 corresponding input end;

Said system master system device is made up of PID controller 29, alternate run module 30; Pressure sensor 3 on the input water pump output water pipe of PID controller 29; Output termination alternate run module 30 inputs of PID controller 29; Frequency converter energy input computing module 28 output welding system main control unit alternate run modules 30 corresponding input end of sub-control device, the input of the V/F converter 25 of the corresponding sub-control device of main control unit alternate run module 30 output terminations.

The utility model said several and water pump frequency converter one to one are placed on the heat sink jointly.Help the heat radiation of frequency converter like this.

The utility model is work like this: the measured pressure signal of pressure sensor that is installed in water pump output oral-lateral is input to the PID controller of main control unit; Compare through PID controller and setup pressure value; The rotating speed that transfers comparative result to control of pump is input to the alternate run module of main control unit; Alternate run module by main control unit is judged according to the frequency converter loss amount and the accumulating losses amount of each sub-control device frequency converter energy input computing module input; It is the balance alternate run that continues operation or obtain each water pump; Confirm that the alternate run module of back main control unit transfers to pump rotary speed the V/F converter of the sub-control device of corresponding water pump; Convert tach signal to voltage signal proportional with it through the V/F converter, this voltage signal is input to the PWM controller, the PWM controller is input to the Frequency Converter Control input to signal through pulse width modulating technology; The corresponding control signal of inverter output of final frequency converter is issued pump motor, and pump motor turns round by new instruction.

Combine accompanying drawing to describe the embodiment of the utility model above; The structure that embodiment provides does not constitute the restriction to the utility model, and those skilled in the art make various distortion within the scope of the appended claims or revise all in protection domain in this area.

Claims (2)

1. the control device of pump constant pressure water supply more than a kind; It comprises several and water pump frequency converter one to one, and detects the temperature pick up of this frequency converter, the DC voltage sensor of frequency converter, the output current sensor of frequency converter, the switching frequency detector of power semiconductor switches; Pressure sensor on the water pump output water pipe; It is characterized in that also having some sub-control devices, system master system device; Wherein:

Said some sub-control devices are corresponding one by one with said frequency converter; The sub-control device is made up of V/F converter, PWM controller, 3 phases/2 phase converter, frequency converter energy input computing module; The V/F converter output end connects PWM controller input; The PWM controller output end connects corresponding Frequency Converter Control input; The output current sensor output termination 3 phases/2 phase converter inputs of frequency converter; The switching frequency detector output end of 3 phases/2 phase converter outputs, V/F converter output end, temperature pick up output, DC voltage sensor output, power semiconductor switches connects frequency converter energy input computing module input; The output that V/F converter input welding system main control unit alternate run module is corresponding, frequency converter energy input computing module output welding system main control unit alternate run module corresponding input end;

Said system master system device is made up of PID controller, alternate run module; Pressure sensor on the input water pump output water pipe of PID controller; The output termination alternate run module input of PID controller; The frequency converter energy input computing module output welding system main control unit alternate run module corresponding input end of sub-control device, the input of the V/F converter of the corresponding sub-control device of main control unit alternate run module output termination.

2. many pumps constant pressure water supply control device according to claim 1 is characterized in that, said several and water pump frequency converter one to one are placed on the heat sink jointly.

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