CN110285087B - Intelligent split pressurization control system and method based on fan superposition - Google Patents
Intelligent split pressurization control system and method based on fan superposition Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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Abstract
The invention relates to an intelligent split pressurization control system and method based on fan superposition, wherein a signal output end of a computer is used as an input end of a frequency converter through a control module, the signal output end of the frequency converter is connected with the input end of a main fan, and the system also comprises an additional controller which consists of an auxiliary fan and an additional circuit; the signal output end of the frequency converter is also connected with the input end of an additional circuit, the output end of the additional circuit is respectively connected with the input ends of the main fan and the auxiliary fan, and the auxiliary fan is connected with the main fan in series; the output end of the static pressure box is connected with the input end of the pressure sensor; the signal output end of the pressure sensor is connected with the input end of the acquisition module, and the signal output end of the acquisition module is connected with the signal input end of the computer. The invention can implant additional controller part to realize linear regulation of air pressure under different working conditions on the premise of keeping the original mechanical and electrical structure unchanged.
Description
Technical Field
The invention belongs to the field of building material detection, and relates to an intelligent split pressurization control system and method based on fan superposition.
Background
A pressurization control system generally used in the art includes a detection section, a controller, and an execution section; the detection part consists of an analog signal acquisition module and a pressure sensor, the controller consists of a computer and a control module, and the execution part consists of a frequency converter and a main fan; the signal output end of the computer is respectively used as the input end of a frequency converter through a conventional control module, and the signal output end of the frequency converter is connected with the input end of the main fan. The output end of the static pressure box is connected with the input end of the pressure sensor; the signal output end of the pressure sensor is connected with the input end of the acquisition module, and the signal output end of the acquisition module is connected with the signal input end of the computer. Because the wind pressure in the original equipment is controlled by a large-amplitude lifting requirement according to the national standard requirement, the original fan, the frequency converter for controlling the fan and the control circuit can not meet the requirement. Only the high-power fan, the frequency converter and the control circuit can be replaced, so that the equipment transformation cost is greatly increased, and the construction time is prolonged.
Disclosure of Invention
Object of the Invention
According to the invention, through adding the auxiliary fan, connecting the new fan and the old fan in series to work and transforming the original control circuit, respective control is realized, linear adjustment of air pressure under different working conditions is realized, the problem of energy consumption of the existing pressurization control system in order to meet national standards is solved, and the purposes of high efficiency and energy saving are achieved.
Technical scheme
An intelligent split pressurization control system based on fan superposition comprises a detection part, a controller and an execution part; the detection part consists of an acquisition module and a pressure sensor, the controller consists of a computer and a control module, and the execution part consists of a frequency converter and a main fan; the signal output part of computer passes through control module as the input of converter, and the signal output part of converter connects the input of main fan, its characterized in that: the system also comprises an additional controller, wherein the additional controller consists of an auxiliary fan and an additional circuit; the signal output end of the frequency converter is also connected with the input end of an additional circuit, the output end of the additional circuit is respectively connected with the input ends of the main fan and the auxiliary fan, and the auxiliary fan is connected with the main fan in series; the output end of the static pressure box is connected with the input end of the pressure sensor; the signal output end of the pressure sensor is connected with the input end of the acquisition module, and the signal output end of the acquisition module is connected with the signal input end of the computer.
The auxiliary fan and the main fan are connected in series through flanges, a step rubber strip mounting groove is formed in the joint of the main fan and the auxiliary fan, and a circle of sealing rubber strip is coated outside the step rubber strip mounting groove.
The inner ring of the sealing rubber strip is provided with two bulges, each bulge is of a foaming porous structure, and the density of each bulge is smaller than that of the material of the outer ring.
The additional circuit comprises a brake resistor R1, a frequency converter, a main fan, an auxiliary fan, a contactor KM1, a contactor KM2, a contactor KM3, an intermediate relay KA1, a solid-state relay SSR, a 24V switching power supply and a board card 812PG, two ends of the brake resistor R1 are respectively connected with brake resistor connecting terminals P1 and PB of the frequency converter, 380V three-phase power supply input ends R, S and T of the frequency converter are respectively connected with live wire ends L1, L2 and L3 of the three-phase power supply, 380V three-phase power supply input ends R, S and T of the frequency converter are also respectively connected with an input end L1, L2 and L3 of a contactor KM2, an input end L3 of the contactor KM2 is also simultaneously connected with an input end L of the 24V switching power supply and a common end 9 of the intermediate relay KA1, a zero wire end N of the three-phase power supply is simultaneously connected with a zero wire input end N of the 24V switching, V and W are respectively connected with input ends L1, L2 and L3 of a contactor KM1, input ends L1, L2 and L3 of a contactor KM1 are also respectively connected with input ends L1, L2 and L3 of a contactor KM3, output ends T1, T1 and T1 of the contactor KM3 are respectively connected with input ends 1 and W of an auxiliary fan, output ends T1, T1 and T1 of the contactor KM1 are respectively connected with input ends 1 and W of a main fan, output ends T1, T1 and T1 of the contactor KM1 are also respectively connected with output ends T1, T1 and T1 of the contactor KM1, a1 and A812 of the contactor KA1 are respectively connected with normally closed end 1 and normally closed end 4 of an intermediate relay 1, a normally closed end A465 and a normally closed end A468 of the intermediate relay KM1 are respectively connected with a coil A1 and A1 of the contactor KM1, a normally closed end A23 and an analog input end A1 and an analog input end A23 of an analog relay A23 and GND of an analog relay The digital output terminals DO15 and DGND of the board 812PG are respectively connected with a + end and a-end of the input terminal IN of the solid-state relay SSR, the + end of the output terminal OUT of the solid-state relay SSR is connected with the coil end 13 of the intermediate relay KA1, the-end of the output terminal OUT of the solid-state relay SSR is connected with the-end of the 24V switching power supply, and the + end of the 24V switching power supply is connected with the coil end 14 of the intermediate relay; the brake resistance R1 is 50 Ω;
the AI10 end of the board 812PG is connected with the output end OUT of the pressure transmitter, the AGND end of the board 812PG is connected with the output end GND of the pressure transmitter, voltage signals acquired by the AI10 end and the AGND end of the board 812PG are converted into pressure values, the analog quantity output terminal AO0 and the AGND end of the board 812PG can be controlled by a computer to output 0-10V direct current analog quantity control voltage, and the voltage is supplied to the analog quantity input terminals AI1 and GND on the control panel of the frequency converter for frequency adjustment; an analog input terminal AI1 and GND on a control board of the frequency converter receive a 0-10V control signal from a board 812PG, and the output frequency is changed to be 0-50 Hz; digital quantity output terminals DO15 and DGND of the board card 812PG can be controlled by a computer to output a group of digital quantity TTL levels to be supplied to an input end IN of the solid-state relay SSR, and the on-off of an output end OUT of the solid-state relay SSR is controlled to play a role of switching; when the input end IN receives the TTL level of the board card, the output end OUT is connected with a channel, so that a coil end 13 and a coil end 14 of the intermediate relay KA1 can be connected to a 24V output end of a 24V switching power supply, and the intermediate relay KA1 works;
when the contactor KM3 does not work, the input end L1 of the contactor KM3 is disconnected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is disconnected with the output end T2 of the contactor KM3, and the input end L3 of the contactor KM3 is disconnected with the output end T3 of the contactor KM 3; when a coil end A1 of a contactor KM3 and a coil end A2 of a contactor KM3 receive 220V alternating-current voltage, the contactor KM3 works, an input end L1 of the contactor KM3 is communicated with an output end T1 of the contactor KM3, an input end L2 of the contactor KM3 is communicated with an output end T2 of the contactor KM3, an input end L3 of the contactor KM3 is communicated with an output end T3 of the contactor KM3, and equivalently, output ends U, V and W of a frequency converter are connected with input ends U, V and W of auxiliary fans, and the frequency converter controls the auxiliary fans;
when the contactor KM1 works, an input end L1 of the contactor KM1 is communicated with an output end T1 of the contactor KM1, an input end L2 of the contactor KM1 is communicated with an output end T2 of the contactor KM1, an input end L3 of the contactor KM1 is communicated with an output end T3 of the contactor KM1, and the frequency converter controls a main fan;
when the KM2 works, an input end L1 of a contactor KM2 is communicated with an output end T1 of the contactor KM2, an input end L2 of a contactor KM2 is communicated with an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is communicated with an output end T3 of the contactor KM2, and power supply of a main fan is directly supplied by 380V;
when the intermediate relay KA1 does not work, no output signal is output from the digital output terminals DO15 and DGND of the board card 812PG, the normally closed terminal 1 of the intermediate relay KA1 is connected with the common terminal 9 of the intermediate relay KA1, the normally closed terminal 4 of the intermediate relay KA1 is connected with the common terminal 12 of the intermediate relay KA1, the normally open terminal 5 of the intermediate relay KA1 is disconnected from the common terminal 9 of the intermediate relay KA1, the normally open terminal 8 of the intermediate relay KA1 is disconnected from the common terminal 12 of the intermediate relay KA1, 220V power is supplied to the coil terminal a1 and the coil terminal a2 of the contactor KM1, at this time, the contactor KM1 works, the contactor KM2 and the contactor KM3 DO not work, the input terminal L3 of the contactor KM3 is connected with the output terminal T3 of the contactor KM3, the input terminal L3 of the contactor 3 is connected with the output terminal T3 of the contactor KM3, at this time, the main frequency converter controls the fan, the frequency converter is disconnected with the auxiliary fan;
when digital quantity output terminals DO15 and DGND of the board 812PG output TTL levels, the intermediate relay KA1 operates, a normally open end 5 of the intermediate relay KA1 is connected to a common end 9 of the intermediate relay KA1, a normally open end 8 of the intermediate relay KA1 is connected to a common end 12 of the intermediate relay KA1, a normally closed end 1 of the intermediate relay KA1 is disconnected from a common end 9 of the intermediate relay KA1, a normally closed end 4 of the intermediate relay KA1 is disconnected from a common end 12 of the intermediate relay KA1, at this time, the contactor KM1 does not operate, the contactors KM2 and KM3 operate, an input end L1 of the contactor KM2 is connected to an output end T1 of the contactor KM2, an input end L2 of the contactor KM2 is connected to an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is connected to an output end 3 of the contactor KM2, at this time, 380V voltage is directly supplied to input ends U, V and W of the main fan, a full frequency of the main fan 1, furthermore, the output ends U, V and W of the frequency converter are disconnected with the input ends U, V and W of the main fan, the contactor KM3 works, the input end L1 of the contactor KM3 is connected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is connected with the output end T2 of the contactor KM3, the input end L3 of the contactor KM3 is connected with the output end T3 of the contactor KM3, and the frequency converter controls the auxiliary fan; the frequency converter controls the auxiliary fan to operate, and the main fan operates at full frequency and full load.
A control method of the intelligent split pressurization control system based on fan superposition is characterized in that:
the method comprises the following steps:
step 2, a sensor in the detection module detects pressure parameters of the static pressure box and the rotating speed of the fan, and then the collected pressure signals are output to a frequency converter through a board 812PG of the computer, analog voltage signals are adjusted according to pressure values, and whether the analog voltage signals reach the maximum value of 10V is judged; if yes, executing step 7, if not, executing step 3;
step 3, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 4, if not, transmitting a control signal to an execution part by a computer in the controller according to parameters output by each sensor in the detection module, and then executing step 5;
the optimization algorithm is described as follows:
yp＝α*xb+β
vt＝xb-Δ
pipressure at each stage of the test
biThe fan input control signals of each stage in the test
ypTarget pressure value
xbPredicting the value of the control signal of the frequency converter
vtActual frequency converter input signal
Delta is a constant coefficient in the range of (0.2V-0.5V)
After the parameter output for realizing the gas pressure control for the first time is set according to the initial condition parameters, the voltage signal for controlling the frequency converter is given out through the control of the PID algorithm, and the pressure control is realized through the closed-loop control.
step 6, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 8, and if not, executing step 9;
step 7, starting the main fan to run at full load, and simultaneously adjusting the output voltage of the computer by adopting a PID control method so as to adjust the rotating speed of the auxiliary fan and realize wind pressure control, and then executing the step 3;
and 9, judging whether to control the next-stage target pressure value, if so, executing the step 5, and if not, finishing.
And the storage unit in the computer stores and stores the voltage control signal correspondingly output to the frequency converter when the preset pressure value of each stage is reached, and calculates the pressure control signal required by the next stage of preset pressure according to the pressure value and the input pressure value of the frequency converter.
And when the main fan cannot reach a preset pressure value in the full-load operation, starting the auxiliary fan.
And when the main fan runs at full load, carrying out PID control operation on the auxiliary fan.
Advantages and effects
Compared with other pressure control technologies, the intelligent split pressurization control system based on fan superposition is implanted with an additional controller part on the premise that the original mechanical and electrical structures of the original system are kept unchanged to the greatest extent in the upgrading and reconstruction process. The air pressure change factors of different working conditions which change linearly are comprehensively considered, an optimal model which integrates multiple parameters is established, the rotating speed of the fan is rapidly adjusted, the defects of the prior art are overcome, the influence factors influencing the pressurization time and the coupling relation among the influence factors can be comprehensively considered, the control precision and accuracy of the pressure control system are greatly improved, and the control time is effectively shortened. The structure is simplified, the construction is convenient, the production efficiency is improved, and the cost is reduced.
Drawings
The invention is further described with reference to the following figures and detailed description.
FIG. 1 is a schematic diagram of the overall connection of the present invention;
FIG. 2 is a schematic diagram of the circuit connections of the present invention;
FIG. 3 is a control flow diagram of the present invention;
FIG. 4 is a schematic view of a joint of a main blower and an auxiliary blower provided with a sealing rubber strip;
FIG. 5 is a schematic view of a split type in which a sealing rubber strip is arranged at the joint of a main fan and an auxiliary fan;
fig. 6 is a schematic structural diagram of the sealing rubber strip.
Description of reference numerals: 10. the step rubber strip mounting groove comprises 20-bulge parts, 100-main fan parts, 150-sealing rubber strip parts and 200-auxiliary fan parts.
Detailed Description
As shown in fig. 1, an intelligent split pressurization control system based on fan superposition comprises a detection part, a controller and an execution part; the detection part consists of an acquisition module and a pressure sensor, the controller consists of a computer and a control module, and the execution part consists of a frequency converter and a main fan; the system also comprises an additional controller, wherein the additional controller consists of an auxiliary fan and an additional circuit; the signal output end of the frequency converter is also connected with the input end of an additional circuit, the output end of the additional circuit is respectively connected with the input ends of the main fan and the auxiliary fan, and the auxiliary fan is connected with the main fan in series; the output end of the static pressure box is connected with the input end of the pressure sensor; the signal output end of the pressure sensor is connected with the input end of the acquisition module, and the signal output end of the acquisition module is connected with the signal input end of the computer.
As shown in fig. 4-6, the auxiliary blower 200 and the main blower 100 are connected in series by flanges, and a step rubber strip mounting groove 10 is provided at the joint of the main blower 100 and the auxiliary blower 200, and is covered by a circle of sealing rubber strip 150. The inner ring of the sealing rubber strip 150 is provided with two protrusions 20, each protrusion 20 is of a foamed porous structure, and the density of the protrusions is smaller than that of the material of the outer ring.
As shown in fig. 2, the additional circuit includes a brake resistor R1, a frequency converter, a main fan, an auxiliary fan, a contactor KM1, a contactor KM2, a contactor KM3, an intermediate relay KA1, a solid-state relay SSR, a 24V switching power supply and a board card 812PG, two ends of the brake resistor R1 are respectively connected to brake resistor connection terminals P1 and PB of the frequency converter, 380V three-phase power supply input terminals R, S and T of the frequency converter are respectively connected to live wire terminals L1, L2 and L3 of the three-phase power supply, 380V three-phase power supply input terminals R, S and T of the frequency converter are respectively connected to input terminals L1, L2 and L3 of a contactor KM2, an input terminal L3 of the contactor KM2 is also simultaneously connected to an input terminal L of the 24V switching power supply and a common terminal 9 of the intermediate relay KA1, a neutral wire terminal N of the three-phase power supply is simultaneously connected to a neutral wire input terminal N of the 24V switching power supply and a, V and W are respectively connected with input ends L1, L2 and L3 of a contactor KM1, input ends L1, L2 and L3 of a contactor KM1 are also respectively connected with input ends L1, L2 and L3 of a contactor KM3, output ends T1, T1 and T1 of the contactor KM3 are respectively connected with input ends 1 and W of an auxiliary fan, output ends T1, T1 and T1 of the contactor KM1 are respectively connected with input ends 1 and W of a main fan, output ends T1, T1 and T1 of the contactor KM1 are also respectively connected with output ends T1, T1 and T1 of the contactor KM1, a1 and A812 of the contactor KA1 are respectively connected with normally closed end 1 and normally closed end 4 of an intermediate relay 1, a normally closed end A465 and a normally closed end A468 of the intermediate relay KM1 are respectively connected with a coil A1 and A1 of the contactor KM1, a normally closed end A23 and an analog input end A1 and an analog input end A23 of an analog relay A23 and GND of an analog relay The digital output terminals DO15 and DGND of the board 812PG are respectively connected with a + end and a-end of the input terminal IN of the solid-state relay SSR, the + end of the output terminal OUT of the solid-state relay SSR is connected with the coil end 13 of the intermediate relay KA1, the-end of the output terminal OUT of the solid-state relay SSR is connected with the-end of the 24V switching power supply, and the + end of the 24V switching power supply is connected with the coil end 14 of the intermediate relay; the brake resistance R1 is 50 Ω;
the AI10 end of the board 812PG is connected with the output end OUT of the pressure transmitter, the AGND end of the board 812PG is connected with the output end GND of the pressure transmitter, voltage signals acquired by the AI10 end and the AGND end of the board 812PG are converted into pressure values, the analog quantity output terminal AO0 and the AGND end of the board 812PG can be controlled by a computer to output 0-10V direct current analog quantity control voltage, and the voltage is supplied to the analog quantity input terminals AI1 and GND on the control panel of the frequency converter for frequency adjustment; an analog input terminal AI1 and GND on a control board of the frequency converter receive a 0-10V control signal from a board 812PG, and the output frequency is changed to be 0-50 Hz; digital quantity output terminals DO15 and DGND of the board card 812PG can be controlled by a computer to output a group of digital quantity TTL levels to be supplied to an input end IN of the solid-state relay SSR, and the on-off of an output end OUT of the solid-state relay SSR is controlled to play a role of switching; when the input end IN receives the TTL level of the board card, the output end OUT is connected with a channel, so that a coil end 13 and a coil end 14 of the intermediate relay KA1 can be connected to a 24V output end of a 24V switching power supply, and the intermediate relay KA1 works;
when the contactor KM3 does not work, the input end L1 of the contactor KM3 is disconnected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is disconnected with the output end T2 of the contactor KM3, and the input end L3 of the contactor KM3 is disconnected with the output end T3 of the contactor KM 3; when a coil end A1 of a contactor KM3 and a coil end A2 of a contactor KM3 receive 220V alternating-current voltage, the contactor KM3 works, an input end L1 of the contactor KM3 is communicated with an output end T1 of the contactor KM3, an input end L2 of the contactor KM3 is communicated with an output end T2 of the contactor KM3, an input end L3 of the contactor KM3 is communicated with an output end T3 of the contactor KM3, and equivalently, output ends U, V and W of a frequency converter are connected with input ends U, V and W of auxiliary fans, and the frequency converter controls the auxiliary fans;
when the contactor KM1 works, an input end L1 of the contactor KM1 is communicated with an output end T1 of the contactor KM1, an input end L2 of the contactor KM1 is communicated with an output end T2 of the contactor KM1, an input end L3 of the contactor KM1 is communicated with an output end T3 of the contactor KM1, and the frequency converter controls a main fan;
when the KM2 works, an input end L1 of a contactor KM2 is communicated with an output end T1 of the contactor KM2, an input end L2 of a contactor KM2 is communicated with an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is communicated with an output end T3 of the contactor KM2, and power supply of a main fan is directly supplied by 380V;
when the intermediate relay KA1 does not work, no output signal is output from the digital output terminals DO15 and DGND of the board card 812PG, the normally closed terminal 1 of the intermediate relay KA1 is connected with the common terminal 9 of the intermediate relay KA1, the normally closed terminal 4 of the intermediate relay KA1 is connected with the common terminal 12 of the intermediate relay KA1, the normally open terminal 5 of the intermediate relay KA1 is disconnected from the common terminal 9 of the intermediate relay KA1, the normally open terminal 8 of the intermediate relay KA1 is disconnected from the common terminal 12 of the intermediate relay KA1, 220V power is supplied to the coil terminal a1 and the coil terminal a2 of the contactor KM1, at this time, the contactor KM1 works, the contactor KM2 and the contactor KM3 DO not work, the input terminal L3 of the contactor KM3 is connected with the output terminal T3 of the contactor KM3, the input terminal L3 of the contactor 3 is connected with the output terminal T3 of the contactor KM3, at this time, the main frequency converter controls the fan, the frequency converter is disconnected with the auxiliary fan;
when digital quantity output terminals DO15 and DGND of the board 812PG output TTL levels, the intermediate relay KA1 operates, a normally open end 5 of the intermediate relay KA1 is connected to a common end 9 of the intermediate relay KA1, a normally open end 8 of the intermediate relay KA1 is connected to a common end 12 of the intermediate relay KA1, a normally closed end 1 of the intermediate relay KA1 is disconnected from a common end 9 of the intermediate relay KA1, a normally closed end 4 of the intermediate relay KA1 is disconnected from a common end 12 of the intermediate relay KA1, at this time, the contactor KM1 does not operate, the contactors KM2 and KM3 operate, an input end L1 of the contactor KM2 is connected to an output end T1 of the contactor KM2, an input end L2 of the contactor KM2 is connected to an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is connected to an output end 3 of the contactor KM2, at this time, 380V voltage is directly supplied to input ends U, V and W of the main fan, a full frequency of the main fan 1, furthermore, the output ends U, V and W of the frequency converter are disconnected with the input ends U, V and W of the main fan, the contactor KM3 works, the input end L1 of the contactor KM3 is connected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is connected with the output end T2 of the contactor KM3, the input end L3 of the contactor KM3 is connected with the output end T3 of the contactor KM3, and the frequency converter controls the auxiliary fan; the frequency converter controls the auxiliary fan to operate, and the main fan operates at full frequency and full load.
The specific interphase voltages of the three-phase power supply are as follows:
(1) 220V alternating current voltage is arranged between the three-phase power supply live wire end L1 and the three-phase power supply zero line end N.
(2) 220V alternating current voltage is arranged between the three-phase power supply live wire end L2 and the three-phase power supply zero line end N.
(3) 220V alternating current voltage is arranged between the three-phase power supply live wire end L3 and the three-phase power supply zero line end N.
(4) 380V alternating voltage is arranged between the live wire ends L1 and L2 of the three-phase power supply.
(5) 380V alternating voltage is arranged between the live wire ends L1 and L3 of the three-phase power supply.
(6) 380V alternating voltage is arranged between the live wire ends L2 and L3 of the three-phase power supply.
Wherein (1) to (3) can be used as 220V for civil use and can be connected with household appliances; and modes (4) to (6) cannot be connected with the domestic electrical appliance.
Therefore, it can be seen in the circuit diagram that "24V switching power supply" and "KA 1" take 220V power in two lines of L3 and N, and the frequency converter takes 380V power from L1, L2 and L3.
The switching power supply can convert 'alternating current 220V' into 'direct current 24V'. And the switching power supply is used more under normal conditions, and has the advantages of less heat generation, more environmental protection, wide voltage range adaptation and the like.
A control method of the intelligent split pressurization control system based on fan superposition comprises the following steps:
and 2, detecting the pressure parameter of the static pressure box and the rotating speed of the fan by a sensor in the detection module, adjusting the analog voltage signal according to the pressure value by using the board 812PG of the computer to output the acquired pressure signal to the frequency converter, and judging whether the analog voltage signal reaches the maximum value of 10V. If yes, executing step 7, if not, executing step 3;
step 3, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 4, if not, transmitting a control signal to an execution part by a computer in the controller according to parameters output by each sensor in the detection module, and then executing step 5;
the optimization algorithm is described as follows:
yp＝α*xb+β
vt＝xb-Δ
pipressure at each stage of the test
biThe fan input control signals of each stage in the test
ypTarget pressure value
xbPredicting the value of the control signal of the frequency converter
vtActual frequency converter input signal
Delta is a constant coefficient in the range of (0.2V-0.5V)
After the parameter output for realizing the gas pressure control for the first time is set according to the initial condition parameters, the voltage signal for controlling the frequency converter is given out through the control of the PID algorithm, and the pressure control is realized through the closed-loop control.
step 6, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 8, and if not, executing step 9;
step 7, starting the main fan to run at full load, and simultaneously adjusting the output voltage of the computer by adopting a PID control method so as to adjust the rotating speed of the auxiliary fan and realize wind pressure control, and then executing the step 3;
and 9, judging whether to control the next-stage target pressure value, if so, executing the step 5, and if not, finishing.
And a storage unit in the computer stores a voltage control signal correspondingly output to the frequency converter when each stage of preset pressure value is reached, and calculates a pressure control signal required by the next stage of preset pressure according to the pressure value and the input voltage value of the frequency converter.
And when the main fan cannot reach a preset pressure value in the full-load operation, starting the auxiliary fan. And when the main fan runs at full load, carrying out PID control operation on the auxiliary fan.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and obvious changes and modifications included in the technical solutions of the present invention are within the scope of the present invention.
Claims (7)
1. An intelligent split pressurization control system based on fan superposition comprises a detection part, a controller and an execution part; the detection part consists of an acquisition module and a pressure sensor, the controller consists of a computer and a control module, and the execution part consists of a frequency converter and a main fan; the signal output part of computer passes through control module as the input of converter, and the signal output part of converter connects the input of main fan, its characterized in that: the system also comprises an additional controller, wherein the additional controller consists of an auxiliary fan and an additional circuit; the signal output end of the frequency converter is also connected with the input end of an additional circuit, the output end of the additional circuit is respectively connected with the input ends of the main fan and the auxiliary fan, and the auxiliary fan is connected with the main fan in series; the output end of the static pressure box is connected with the input end of the pressure sensor; the signal output end of the pressure sensor is connected with the input end of the acquisition module, and the signal output end of the acquisition module is connected with the signal input end of the computer;
the additional circuit comprises a brake resistor R1, a frequency converter, a main fan, an auxiliary fan, a contactor KM1, a contactor KM2, a contactor KM3, an intermediate relay KA1, a solid-state relay SSR, a 24V switching power supply and a board card 812PG, two ends of the brake resistor R1 are respectively connected with brake resistor connecting terminals P1 and PB of the frequency converter, 380V three-phase power supply input ends R, S and T of the frequency converter are respectively connected with live wire ends L1, L2 and L3 of the three-phase power supply, 380V three-phase power supply input ends R, S and T of the frequency converter are also respectively connected with an input end L1, L2 and L3 of a contactor KM2, an input end L3 of the contactor KM2 is also simultaneously connected with an input end L of the 24V switching power supply and a common end 9 of the intermediate relay KA1, a zero wire end N of the three-phase power supply is simultaneously connected with a zero wire input end N of the 24V switching, V and W are respectively connected with input ends L1, L2 and L3 of a contactor KM1, input ends L1, L2 and L3 of a contactor KM1 are also respectively connected with input ends L1, L2 and L3 of a contactor KM3, output ends T1, T1 and T1 of the contactor KM3 are respectively connected with input ends 1 and W of an auxiliary fan, output ends T1, T1 and T1 of the contactor KM1 are respectively connected with input ends 1 and W of a main fan, output ends T1, T1 and T1 of the contactor KM1 are also respectively connected with output ends T1, T1 and T1 of the contactor KM1, a1 and A812 of the contactor KA1 are respectively connected with normally closed end 1 and normally closed end 4 of an intermediate relay 1, a normally closed end A465 and a normally closed end A468 of the intermediate relay KM1 are respectively connected with a coil A1 and A1 of the contactor KM1, a normally closed end A23 and an analog input end A1 and an analog input end A23 of an analog relay A23 and GND of an analog relay The digital output terminals DO15 and DGND of the board 812PG are respectively connected with a + end and a-end of the input terminal IN of the solid-state relay SSR, the + end of the output terminal OUT of the solid-state relay SSR is connected with the coil end 13 of the intermediate relay KA1, the-end of the output terminal OUT of the solid-state relay SSR is connected with the-end of the 24V switching power supply, and the + end of the 24V switching power supply is connected with the coil end 14 of the intermediate relay; the brake resistance R1 is 50 Ω;
the AI10 end of the board 812PG is connected with the output end OUT of the pressure transmitter, the AGND end of the board 812PG is connected with the output end GND of the pressure transmitter, voltage signals acquired by the AI10 end and the AGND end of the board 812PG are converted into pressure values, the analog quantity output terminal AO0 and the AGND end of the board 812PG can be controlled by a computer to output 0-10V direct current analog quantity control voltage, and the voltage is supplied to the analog quantity input terminals AI1 and GND on the control panel of the frequency converter for frequency adjustment; an analog input terminal AI1 and GND on a control board of the frequency converter receive a 0-10V control signal from a board 812PG, and the output frequency is changed to be 0-50 Hz; digital quantity output terminals DO15 and DGND of the board card 812PG can be controlled by a computer to output a group of digital quantity TTL levels to be supplied to an input end IN of the solid-state relay SSR, and the on-off of an output end OUT of the solid-state relay SSR is controlled to play a role of switching; when the input end IN receives the TTL level of the board card, the output end OUT is connected with a channel, so that a coil end 13 and a coil end 14 of the intermediate relay KA1 can be connected to a 24V output end of a 24V switching power supply, and the intermediate relay KA1 works;
when the contactor KM3 does not work, the input end L1 of the contactor KM3 is disconnected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is disconnected with the output end T2 of the contactor KM3, and the input end L3 of the contactor KM3 is disconnected with the output end T3 of the contactor KM 3; when a coil end A1 of a contactor KM3 and a coil end A2 of a contactor KM3 receive 220V alternating-current voltage, the contactor KM3 works, an input end L1 of the contactor KM3 is communicated with an output end T1 of the contactor KM3, an input end L2 of the contactor KM3 is communicated with an output end T2 of the contactor KM3, an input end L3 of the contactor KM3 is communicated with an output end T3 of the contactor KM3, and equivalently, output ends U, V and W of a frequency converter are connected with input ends U, V and W of auxiliary fans, and the frequency converter controls the auxiliary fans;
when the contactor KM1 works, an input end L1 of the contactor KM1 is communicated with an output end T1 of the contactor KM1, an input end L2 of the contactor KM1 is communicated with an output end T2 of the contactor KM1, an input end L3 of the contactor KM1 is communicated with an output end T3 of the contactor KM1, and the frequency converter controls a main fan;
when the KM2 works, an input end L1 of a contactor KM2 is communicated with an output end T1 of the contactor KM2, an input end L2 of a contactor KM2 is communicated with an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is communicated with an output end T3 of the contactor KM2, and power supply of a main fan is directly supplied by 380V;
when the intermediate relay KA1 does not work, no output signal is output from the digital output terminals DO15 and DGND of the board card 812PG, the normally closed terminal 1 of the intermediate relay KA1 is connected with the common terminal 9 of the intermediate relay KA1, the normally closed terminal 4 of the intermediate relay KA1 is connected with the common terminal 12 of the intermediate relay KA1, the normally open terminal 5 of the intermediate relay KA1 is disconnected from the common terminal 9 of the intermediate relay KA1, the normally open terminal 8 of the intermediate relay KA1 is disconnected from the common terminal 12 of the intermediate relay KA1, 220V power is supplied to the coil terminal a1 and the coil terminal a2 of the contactor KM1, at this time, the contactor KM1 works, the contactor KM2 and the contactor KM3 DO not work, the input terminal L3 of the contactor KM3 is connected with the output terminal T3 of the contactor KM3, the input terminal L3 of the contactor 3 is connected with the output terminal T3 of the contactor KM3, at this time, the main frequency converter controls the fan, the frequency converter is disconnected with the auxiliary fan;
when digital quantity output terminals DO15 and DGND of the board 812PG output TTL levels, the intermediate relay KA1 operates, a normally open end 5 of the intermediate relay KA1 is connected to a common end 9 of the intermediate relay KA1, a normally open end 8 of the intermediate relay KA1 is connected to a common end 12 of the intermediate relay KA1, a normally closed end 1 of the intermediate relay KA1 is disconnected from a common end 9 of the intermediate relay KA1, a normally closed end 4 of the intermediate relay KA1 is disconnected from a common end 12 of the intermediate relay KA1, at this time, the contactor KM1 does not operate, the contactors KM2 and KM3 operate, an input end L1 of the contactor KM2 is connected to an output end T1 of the contactor KM2, an input end L2 of the contactor KM2 is connected to an output end T2 of the contactor KM2, an input end L3 of the contactor KM2 is connected to an output end 3 of the contactor KM2, at this time, 380V voltage is directly supplied to input ends U, V and W of the main fan, a full frequency of the main fan 1, furthermore, the output ends U, V and W of the frequency converter are disconnected with the input ends U, V and W of the main fan, the contactor KM3 works, the input end L1 of the contactor KM3 is connected with the output end T1 of the contactor KM3, the input end L2 of the contactor KM3 is connected with the output end T2 of the contactor KM3, the input end L3 of the contactor KM3 is connected with the output end T3 of the contactor KM3, and the frequency converter controls the auxiliary fan; the frequency converter controls the auxiliary fan to operate, and the main fan operates at full frequency and full load.
2. The intelligent split pressurization control system based on fan superposition according to claim 1, characterized in that: the auxiliary fan (200) and the main fan (100) are connected in series through flanges, a step rubber strip mounting groove (10) is formed in the joint of the main fan (100) and the auxiliary fan (200), and a circle of sealing rubber strip (150) is coated outside the step rubber strip mounting groove.
3. The intelligent split pressurization control system based on fan superposition according to claim 2, characterized in that: the inner ring of the sealing rubber strip (150) is provided with two bulges (20), each bulge (20) is of a foaming porous structure, and the density of the bulges is smaller than that of the material of the outer ring.
4. The control method of the intelligent split pressurization control system based on fan superposition according to claim 1 is characterized in that: the method comprises the following steps:
step 1, setting a pressure grade and a target pressure value which need to be reached by equipment, setting the lowest voltage for starting a frequency converter according to a user, and gradually increasing the voltage of a control signal at a voltage of 0.83-1.25V per second for 8-12 seconds;
step 2, a sensor in the detection module detects pressure parameters of the static pressure box and the rotating speed of the fan, and then the collected pressure signals are output to a frequency converter through a board 812PG of the computer, analog voltage signals are adjusted according to pressure values, and whether the analog voltage signals reach the maximum value of 10V is judged; if yes, executing step 7, if not, executing step 3;
step 3, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 4, if not, transmitting a control signal to an execution part by a computer in the controller according to parameters output by each sensor in the detection module, and then executing step 5;
step 4, increasing the output voltage of the computer by adopting an incremental control PID algorithm, and then executing step 3;
the optimization algorithm is described as follows:
yp＝α*xb+β
vt＝xb-Δ
pipressure at each stage of the test
biThe fan input control signals of each stage in the test
ypTarget pressure value
xbPredicting the value of the control signal of the frequency converter
vtActual frequency converter input signal
Delta is a constant coefficient in the range of (0.2V-0.5V)
After the parameter output for realizing the gas pressure control for the first time is set according to the initial condition parameters, a voltage signal for controlling the frequency converter is given out through the control of a PID algorithm, and the pressure is controlled through the closed-loop control;
step 5, according to the calculation result of the optimization algorithm, optimizing and calculating different working condition parameters, outputting an optimized rotating speed control signal to an execution part, and then executing step 6;
step 6, judging whether the pressure signal value is lower than a target pressure value, if so, executing step 8, and if not, executing step 9;
step 7, starting the main fan to run at full load, and simultaneously adjusting the output voltage of the computer by adopting a PID control method so as to adjust the rotating speed of the auxiliary fan and realize wind pressure control, and then executing the step 3;
step 8, increasing the output voltage of the computer by adopting a PID control method, and then executing step 6;
and 9, judging whether to control the next-stage target pressure value, if so, executing the step 5, and if not, finishing.
5. The intelligent split pressurization control system and the control method based on fan superposition according to claim 4, wherein: and the storage unit in the computer stores a voltage control signal correspondingly output to the frequency converter when each stage of preset pressure value is reached, and calculates a pressure control signal required by the next stage of preset pressure according to the pressure value and the input voltage value of the frequency converter.
6. The intelligent split pressurization control system and the control method based on fan superposition according to claim 4, wherein: and when the main fan cannot reach a preset pressure value in the full-load operation, starting the auxiliary fan.
7. The intelligent split pressurization control system and the control method based on fan superposition according to claim 4, wherein: and when the main fan runs at full load, carrying out PID control operation on the auxiliary fan.
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| CN201953699U (en) * | 2011-01-30 | 2011-08-31 | 北京西电华清科技有限公司 | Speed regulating device for ventilation machine |
| CN103199615B (en) * | 2013-04-26 | 2015-05-27 | 天津中水有限公司 | Uninterrupted switching power supply |
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