JP3980848B2 - Supply / exhaust control method for paint booth with supply air - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides an air supply fan that causes air-conditioned air to flow down from above into a work zone such as a paint zone that is partitioned in a paint booth, and an air supply fan that exhausts contaminated air in the work zone downward. The present invention relates to an air supply / exhaust control method for a care painting booth.
[0002]
[Prior art]
An automotive air supply painting booth is formed in a tunnel type having both ends opened, and is partitioned into a plurality of work zones for performing various operations from the entrance to the exit.
For example, even in a paint booth with air supply that only has a relatively simple one-stage paint zone, the preparation room-hand blow correction paint zone automatic paint zone along the traveling direction of the automobile body that will be the workpiece (workpiece) -It is divided into a setting zone and a confirmation zone.
[0003]
In such a paint booth with air supply, the internal pressure is maintained at a slightly positive pressure compared to the atmospheric pressure, and dust and dust that cause paint quality deterioration from entering and exiting the coating booth are prevented. At the same time, the optimum wind speed of the airflow flowing through each zone is set so that the optimum painting environment is obtained and the burden of exhaust treatment is reduced, and the supply / exhaust amount is determined accordingly. Is common.
[0004]
For example, the air velocity of the conditioned air flowing down the floor from the plenum chamber formed on the ceiling of each zone is set to about 0.5 m / s in order to keep the work environment appropriate in the manual blow correction coating zone. The wind speed of the coating zone is determined in consideration of the type of coating machine and the solvent concentration. The wind speed when using a bell type coating machine is set to about 0.2 to 0.4 m / s. In the setting zone where there is no worker, the speed is set to about 0.2 m / s.
[0005]
In this case, if the supply air volume of the conditioned air supplied to each zone and the exhaust air volume exhausted from each zone are maintained at a preset air volume, it is within the adjacent zone from the entrance / exit of each zone. Air does not flow in and out, and each zone is maintained in an appropriate painting environment.
However, in reality, changes in the pressure loss of the air supply system and exhaust system, specifically clogging of each filter, contamination of the grating installed in the zone, changes in the amount of water flowing through the water film plate, exhaust treatment equipment, etc. With the change in pressure loss, the supply / exhaust balance of each zone is lost and air flows in and out between adjacent zones, causing a so-called mixed flow phenomenon called air flow.
[0006]
Then, when a diagonal flow occurs between adjacent zones, for example, between the manual correction coating zone and the automatic coating zone, the paint applied in one coating zone is oversprayed, and the paint mist is applied to the other coating zone. Flowed up to the zone, the paint of a color different from the color to be painted adheres to the work and causes color cast, or the dried paint particles become dust and adheres to the work surface, causing rough skin. May cause poor coating due to adhesion.
This is not limited to the case where a diagonal flow occurs between the coating zones, and a diagonal flow may occur from each coating zone to the preparation room adjacent to the preceding stage, the setting zone and the confirmation zone of the subsequent stage, and vice versa. The same applies to the case where a mixed flow occurs.
[0007]
For this reason, the air volume / velocity etc. of the air flow flowing in / out from the work loading / unloading section dividing each zone is detected in a state where the air supply volume supplied from the air supply fan is kept constant. The supply / exhaust balance is maintained by adjusting the exhaust air volume by feedback controlling the exhaust air blower so as to maintain the target value set in advance as a value that does not cause adverse effects due to the mixed flow (Japanese Patent Laid-Open No. Sho 61-61). (No. 222257, No. 222257, JP-A-11-300408)
[0008]
Also, at the start of operation of the paint booth can not supply and exhaust balance of each zone to flow workpiece coating line to be stable, energy saving, in terms of CO ₂ emission reduction, short time in each zone Therefore, there is a demand for a stable state with a balanced supply and exhaust.
For this reason, the air supply blower and the exhaust blower are started at the number of revolutions immediately before the end of the previous operation when the supply / exhaust balance was stable, and the control is shifted to the feedback control after a predetermined time has elapsed (Japanese Patent Laid-Open No. 62-152569). issue).
[0009]
In this way, even if there is a change in the pressure loss of the air supply system and exhaust system over time, such as clogging of the filter and contamination of the grating installed in the zone, each air blower has a balanced supply / exhaust from the beginning. Each zone is stabilized in a short time because it is started up at a maintained rotational speed.
[0010]
[Problems to be solved by the invention]
By the way, the maintenance work and the cleaning work of the painting line operated on weekdays are usually performed on Saturday and Sunday of the weekend when the painting line is stopped.
In this case, if the booth is clogged, the filter is clogged, the grating or the blade of the exhaust fan is removed, or if the painting equipment is replaced or rearranged, the pressure loss of the air supply system and exhaust system will be greatly increased. Change.
[0011]
In particular, the grating installed in the exhaust system, the blade of the exhaust fan, and the filter of the exhaust treatment device are more easily contaminated with paint mist than the air supply system filter. Since the painting equipment is often installed on the grating, the effective opening area of the grating changes due to the replacement or rearrangement of the painting equipment, and the pressure loss of the exhaust system changes greatly.
[0012]
Therefore, if the air supply blower and exhaust blower are started at the rotation speed just before the end of operation on Friday in order to start a paint booth on Monday, the exhaust system pressure loss will be significantly lower than before cleaning. Therefore, the exhaust air volume becomes larger than the air supply air volume, and the air supply / exhaust balance is lost.
[0013]
Then, the air volume of the air flow flowing in and out from the work loading / unloading section that divides the zones after a predetermined time is detected, and the detected air volume is maintained at a preset target value as a value that does not adversely affect the diagonal flow. Although the exhaust blower is feedback-controlled as described above, the initial supply / exhaust balance is significantly disrupted, so a new problem that it takes a considerable amount of time to converge to the target value even if the supply / exhaust balance is attempted by feedback control. Produced.
[0014]
Therefore, the present invention cleans the interior of the painting booth after the end of the previous operation, or even when the pressure loss of the exhaust system has changed significantly due to replacement or replacement of painting equipment, It is a technical problem to be able to start up the supply / exhaust balance in an extremely short time.
[0015]
[Means for Solving the Problems]
In order to solve this problem, the invention of claim 1 is directed to an air supply blower that causes air-conditioned air to flow down from above in a work zone defined in a paint booth with air supply, and contamination in the work zone. The exhaust blower that discharges air below is started at the rotation speed immediately before the end of the previous operation when the supply / exhaust balance was stable at the start of the operation of the painting booth, and then entered and exited from the work loading / unloading port of the zone. In the air supply / exhaust control method of an air supply painting booth, which detects a physical quantity that changes according to the air volume to be performed, and feedback-controls the air supply fan exhaust fan so that the detected amount becomes a preset target value, the air supply fan After the start of the exhaust blower and before the start of the feedback control, the exhaust air volume detection step for detecting the exhaust air volume, It is determined whether or not the exhaust air flow is within the allowable range. When it is determined that the exhaust air flow is within the allowable range, the control shifts to the feedback control. When it is determined that the exhaust air flow is out of the allowable range, Preliminary adjustment that shifts to the feedback control after calculating the appropriate rotational speed that can obtain the appropriate exhaust air volume based on the characteristics, the exhaust fan speed, and the detected exhaust air volume by calculation processing, operating the exhaust air blower at the appropriate rotational speed And a step.
[0016]
According to the first aspect of the present invention, after the supply air blower and the exhaust air blower are started at the number of revolutions immediately before the end of the previous operation when the supply / exhaust amount balance is stable, the exhaust air volume detection is first performed before starting the feedback control. The exhaust air volume is detected in steps.
[0017]
If there is no significant change in the pressure loss of the exhaust system compared to the previous end, such as when starting normal morning operation, the supply air volume and exhaust air volume will not change from immediately before the end of the previous operation. The value of the exhaust air volume is determined to be within the allowable range of the appropriate exhaust air volume that can maintain the supply / exhaust balance, and the control shifts to feedback control with the supply / exhaust balance maintained.
[0018]
However, if the paint booth is cleaned or maintained on Saturdays, Sundays, or during consecutive holidays, the pressure loss of the exhaust resistance will change greatly from the end of the previous painting work, especially if cleaning work is performed. Therefore, if the engine is started at the rotation speed immediately before the end of the previous operation, it is determined that the detected exhaust air volume exceeds the appropriate exhaust air volume and is outside the allowable range of the appropriate exhaust air volume.
[0019]
In this case, an appropriate number of revolutions for obtaining an appropriate amount of exhaust air is calculated based on the characteristics unique to the exhaust fan, the number of revolutions of the exhaust fan, and the detected amount of exhaust air, and the exhaust fan is operated at the appropriate number of revolutions.
Since the appropriate rotational speed is calculated by calculation processing based on the detected exhaust air volume and the like, the time lag for calculating the appropriate rotational speed is short, and therefore the exhaust blower can be rotated at the appropriate rotational speed in a short time.
[0020]
After the preliminary adjustment as described above, the control shifts to the feedback control, and when the feedback control is started, the supply / exhaust balance is generally maintained. It can be converged.
[0021]
According to a second aspect of the present invention, the exhaust blower is driven by a motor whose frequency is controlled by an inverter, and in the exhaust air volume detection step, the current control frequency and the current control frequency are calculated based on the air flow-power-control frequency characteristic curve data of the exhaust blower. The exhaust air volume is obtained from the supply power.
[0022]
According to the invention of claim 2, since the air volume sensor or the wind speed sensor is not used when detecting the exhaust air volume, it is calculated based on the air volume-power-control frequency characteristic curve data of the exhaust air blower. Exhaust air mixed with paint mist, such as paint booth exhaust, adheres to the sensor in large quantities and does not become unmeasurable, and the exhaust air volume can be calculated reliably in a shorter time.
[0023]
According to a third aspect of the present invention, when the exhaust blower is driven by a motor that controls the frequency of rotation by an inverter, and the exhaust air flow is determined to be outside the allowable range of the appropriate exhaust air flow in the preliminary adjustment step, the exhaust blower is Based on the air volume-pressure characteristic curve data when the engine is operated at the control frequency, the air flow-pressure characteristic curve data of the exhaust resistance passing through the point corresponding to the detected exhaust air volume on the air volume-pressure characteristic curve is obtained, and the air volume- An appropriate control frequency is calculated from the relational expression of the air flow-pressure characteristic curve of the exhaust blower passing through the point corresponding to the appropriate exhaust air flow on the pressure characteristic curve data, and after operating the exhaust blower at the control frequency, the feedback control is performed. It is supposed to migrate.
[0024]
According to the third aspect of the present invention, when an exhaust blower whose frequency is controlled in frequency is used, the control frequency of the AC power supplied to rotate at the appropriate speed can be directly calculated. Therefore, the time can be further shortened by combining with the invention of claim 2.
[0025]
In the invention of claim 4, when the paint booth with air supply is divided into a plurality of work zones, after performing the air supply / exhaust control by the exhaust air volume detection step and the preliminary adjustment step for all the work zones, The feedback control is performed for one work zone, and then the feedback control is sequentially performed for another work zone adjacent thereto.
[0026]
According to this, since the rotational speed of the exhaust blower is preliminarily adjusted for all the work zones, the supply / exhaust balance is maintained in a substantially good state at the same time, and then the exhaust air is exhausted according to the air volume of the airflow flowing between the zones. Since the air volume is finely adjusted, it is difficult to cause a lateral flow between the work zones.
In addition, after maintaining the supply / exhaust balance in one work zone, the air supply / exhaust balance is established sequentially for adjacent work zones, so that a large amount of air flows between the work zones during that time, and control is affected by that. The supply / exhaust balance can be adjusted in a short time for the entire painting booth.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be specifically described below with reference to the drawings.
FIG. 1 is a flowchart showing the method of the present invention, FIG. 2 is a graph showing the process of the exhaust air volume detecting step, FIG. 3 is a graph explaining the process of the preliminary adjustment step, and FIG. 4 is a paint booth with a supply air using the method of the present invention. It is explanatory drawing which shows.
[0028]
4 is divided into a plurality of work zones 4 by silhouette plates 3 arranged at predetermined intervals along the traveling direction of a conveyor 2 that conveys workpieces. A plenum chamber 5 and an exhaust chamber 6 are arranged for each zone 4.
[0029]
An air conditioner 7 that supplies conditioned air to each zone 4 is connected to each plenum chamber 5 via an air supply duct 9 that is branched on the downstream side of an air supply fan (supply air blower) 8. Exhaust ducts 11 with exhaust fans (exhaust blowers) 10 are connected to the exhaust chambers 6.
[0030]
The branched air supply duct 9 is provided with an air supply air volume sensor 12 that detects the air supply air volume for each zone 4 and an auto damper 13 that individually adjusts the air supply air volume.
[0031]
In addition, each exhaust fan 10 is connected to an inverter 15 that frequency-controls the rotational speed of each drive motor 14 so that the exhaust air volume can be adjusted for each zone 4.
[0032]
On the other hand, in the painting booth 1, the airflow of the airflow flowing across each zone 4 is formed below the opening of the silhouette plate 3 serving as a work loading / unloading port of each zone 4 or in an air hole formed through the silhouette plate 3. In this example, wind speed sensors 16 are arranged as sensors that detect physical quantities (air volume, wind speed, pressure, etc.) that change accordingly.
[0033]
The supply / exhaust control device 20 for controlling the supply air volume to each zone 4 and the exhaust air volume from each zone 4 is connected to its input side with the supply air volume sensor 12 and the wind speed sensor 16. On the side, an air supply fan 8, an auto damper 13, and an inverter 15 of an exhaust fan 10 are connected.
[0034]
The air supply / exhaust control device 20 controls the exhaust air volume so as not to generate a mixed flow between the work zones 4 while maintaining the air supply air volume supplied to each zone 4 constant.
[0035]
FIG. 1 shows the control procedure. First, when a start switch (not shown) of the painting booth 1 is turned on, in step STP1, each work zone 4... Air supply fan 8 and exhaust fan 10 are supplied. The engine is started at the speed immediately before the end of the previous operation when the exhaust balance is stable, and the auto damper 13 is adjusted based on the air volume detected by the air volume sensor 15 interposed in each air duct 9 to supply air. The air volume is maintained at a predetermined air volume preset for each zone.
[0036]
Next, the exhaust air volume is detected at step STP2.
In this example, the exhaust air volume is calculated from the characteristics of the exhaust fan 10 in order to quickly detect the exhaust air volume.
Specifically, as shown in FIG. 2, the exhaust fan 10 generally has characteristic curve data representing the relationship between exhaust air volume-power-rotation speed, so that if two power and rotation speeds can be specified, the exhaust fan 10 can be exhausted. The air volume can be easily calculated.
[0037]
In this example, since the frequency of the drive motor 14 is controlled, the characteristic curve data of the exhaust air flow Q-power W-rotation speed of the exhaust fan 10 is expressed as follows when the control frequency proportional to the rotation speed is Zn (Hz). It can be expressed by an expression.
[0038]
[Formula 1]
W = A (Zn / 60) Q ² + B (Zn / 60) ² Q + C (Zn / 60) ³
A, B, C: characteristic coefficients specific to each exhaust fan when Zn is 60 Hz
FIG. 2 is a graph showing this relationship. Since the secondary QW characteristic curve is specified by the control frequency, the exhaust air volume Q can be derived from the power W.
As a calculation formula, the power W and the control frequency Zn supplied from the inverter 15 to the drive motor 14 of the exhaust fan 10 are known, and the values A, B, and C are also known for each exhaust fan 10. Therefore, the current exhaust air volume Q ₁ can be calculated by substituting these values into the above equation.
[0040]
Next, in step STP3, it is determined whether or not the detected exhaust air volume calculated in step STP2 is within an allowable range of an appropriate exhaust air volume preset as a value capable of maintaining the supply / exhaust balance. If it is determined, the process proceeds to step STP6. If it is determined that the value is outside the allowable range, the process proceeds to step STP4.
[0041]
In step STP4, an appropriate rotational speed at which an appropriate exhaust air volume can be obtained based on the characteristics unique to the exhaust fan 10, the rotational speed, and the detected exhaust air volume is calculated by a calculation process.
That is, the exhaust the exhaust air volume Q of the fan 10 is expressed by a function of the pressure H and the control frequency (rotational speed), if the pressure at the time of evacuation in the proper exhaust airflow Q ₀ (pressure loss) is known, the proper exhaust airflow Q ₀ Can be obtained, and the pressure (pressure loss) at that time is determined from the air flow-pressure characteristic curve of the exhaust resistance.
[0042]
When the processing in step STP4 be described with reference to the graph shown in FIG. 3, first, at step STP41, the air volume when operating the exhaust fan 10 in the current control frequency _{Z 1} - determined pressure characteristic curve data _{D 1,} step STP42 in its air volume - detecting the exhaust air volume Q air volume of the exhaust resistance through a point corresponding to ₁ on the pressure characteristic curve data D ₁ - the determined pressure characteristic curve data D _2, in step STP43, the exhaust resistance air volume - pressure characteristic curve An appropriate control frequency Z ₀ is calculated from the relational expression of the air volume-pressure characteristic curve data D ₃ of the exhaust fan 10 passing through a point corresponding to the appropriate exhaust air volume of the data D ₂ .
[0043]
More specifically, in step STP41, based on the control frequency Z ₁ of the exhaust fan 10 which is currently operated, the air volume - determining the pressure characteristic curve data D _1.
The relationship between the exhaust air volume Q and the pressure H of the exhaust fan 10 is expressed by the following equation when the control frequency proportional to the rotational speed is Zn (Hz).
[0044]
[Formula 2]
H = A _H Q ² + B _H P (Zn / 60) Q + C _H (Zn / 60) ²
A _H , B _H , C _H : Characteristic coefficient specific to each exhaust fan when Zn is 60 Hz
Then, at step STP42, the air volume - a point corresponding to the detected exhaust air volume to _{Q 1} on the pressure characteristic curve data _{D 1 (Q 1, H 1} ) flow rate of the exhaust resistance through the - determine the pressure characteristic curve data _{D 2.}
In this example, since the resistance curve representing the relationship between the exhaust air volume Q and the pressure H of the exhaust resistance is a quadratic curve, the detected exhaust air volume Q ₁ to the pressure H based on the air volume-pressure characteristic curve data D ₁ of the exhaust fan 10. ₁ is calculated, and the coefficient R is obtained by substituting the air volume Q = Q ₁ and the pressure H = H ₁ into the following equation.
[0046]
[Formula 3]
H = RQ ²
[0047]
Then, at step STP43, the air volume of the exhaust resistance - the exhaust fan 10 through the points corresponding to the pressure characteristic curve data D proper exhaust airflow Q ₀ of ₂ air volume - pressure characteristic curve data D ₃ proper control frequency Z from equation of ₀ is calculated.
In this example, the exhaust resistance airflow - by substituting a proper exhaust airflow Q ₀ in Equation 3 representing the pressure characteristic curve data D _2, calculates the pressure H ₀ when evacuated at the proper exhaust airflow Q _0, then each (Q ₀ , H ₀ ) is substituted into the relational expression of the air flow-pressure characteristic curve of the exhaust fan 10 to calculate an appropriate control frequency Z ₀ .
That is, an appropriate control frequency Z ₀ is calculated by substituting the air volume Q = Q ₀ and the pressure H = H ₀ into Equation 2.
[0048]
Then, the processing proceeds to step STP5, and drive power supply of the control frequency Z ₀ which is calculated with respect to the drive motor 14 from the inverter 15, after driving the exhaust fan 10 at a proper rotational speed, the process proceeds to step STP6.
[0049]
In step STP6, the wind speed of the air flow flowing in and out from the work loading / unloading port of one work zone is detected by the wind speed sensors 16 and 16, and the exhaust fan is set so that the detected amount becomes a preset target value (for example, 0). 10 feedback control is executed.
[0050]
At this time, it has been confirmed that the exhaust fan 10 is operated at an appropriate exhaust air volume at step STP3, or is operated at a rotational speed at which the appropriate exhaust air volume can be obtained quickly through steps STP4 and STP5. At the time of shifting to the feedback control of STP6, the supply / exhaust balance has already been established, and when shifting to the feedback control, the rotational speed converges to an appropriate value almost simultaneously and the startup time until the supply / exhaust balance becomes stable is reached. Significantly shortened.
[0051]
Further, when the supply / exhaust control is performed for each of the work zones 4..., The supply / exhaust control of steps STP 1 to STP 5 is performed on all the work zones 4. Then, the feedback control in step STP6 is performed, and then the feedback control in step STP6 may be sequentially performed for the other work zones 4 adjacent to this.
[0052]
The control in step STP2 is a specific example of the exhaust air volume detection step, the control in steps STP3 to STP5 is a specific example of the preliminary adjustment step, and step STP6 is a specific example of the feedback control.
[0053]
Further, in the above description, in order to calculate an appropriate frequency, in step STP41～43, Kakukazeryou - that calculates the proper control frequency Z ₀ on the basis of the equations representing the pressure characteristic curve data D ₁ to D ₃ has been described, Kakukazeryou - or calculating the proper control frequency Z ₀ to obtain the intersection coordinates of each while the pressure characteristic curve data D ₁ to D ₃ and graphic display, Kakukazeryou - pressure characteristic curve data D ₁ with reference to the data table representing a to D ₃ may be a case of calculating the proper control frequency Z _0.
[0054]
Furthermore, a case has been described in which sequentially processes up to step STP41~ step STP43 stepwise, the detected exhaust air volume Q _1, and the control frequency Z _1, one of the transfer function to the input value only proper exhaust airflow H ₀ It is also possible to make an appropriate control frequency.
[0055]
Furthermore, the exhaust air volume is not limited to the calculation in step STP2, but may be detected by an air volume sensor or a wind speed sensor arranged in each exhaust duct 11.
[0056]
【The invention's effect】
As described above, according to the method of the present invention, even if the pressure loss of the exhaust system changes significantly due to cleaning in the painting booth after the end of the previous operation, replacement of the painting equipment, and rearrangement, the exhaust fan Before the feedback control is performed, the exhaust fan can be quickly operated at a rotational speed that can obtain the appropriate exhaust air volume. There is a very excellent effect that the start-up time until it can be greatly shortened.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a method of the present invention.
FIG. 2 is a graph showing processing of an exhaust air volume detection step.
FIG. 3 is a graph illustrating processing of a preliminary adjustment step.
FIG. 4 is an explanatory view showing a paint booth with air supply using the method of the present invention.
[Explanation of symbols]
1 ……… Painting booth 4 with air supply ……… Work zone 8 ……… Air supply fan (air supply blower)
10 ... Exhaust fan (exhaust fan)
12 ... Air supply sensor 13 ... Auto damper 14 ... Drive motor 15 ... Inverter 16 ... Air speed sensor 20 ... Air supply / exhaust control device

Claims (4)

An air supply blower (8) that causes air-conditioned air to flow down from above in a work zone (4) that is defined in the paint booth with air supply (1), and contaminated air in the work zone (4) The exhaust blower (10) to be discharged downward is started at the rotation speed immediately before the end of the previous operation when the supply / exhaust balance was stable at the start of the operation of the painting booth (1), and then the zone (4) A physical quantity that changes in accordance with the amount of air flowing in and out from the work loading / unloading port is detected, and the air supply blower (8) and the exhaust blower (10) are feedback-controlled (STP6) so that the detected amount becomes a preset target value. In the supply / exhaust control method of the paint booth with supply air,
An exhaust air volume detecting step (STP2) for detecting an exhaust air volume after starting the supply air fan (8) and the exhaust air fan (10) and before starting the feedback control;
It is determined whether or not the detected exhaust air volume is within the allowable range of the appropriate exhaust air volume that can maintain the supply / exhaust balance. Is calculated by calculating the appropriate rotational speed for obtaining an appropriate exhaust air volume based on the characteristics unique to the exhaust air fan (10), the rotational speed of the exhaust air fan (10), and the detected exhaust air volume. A preliminary adjustment step (STP3 to 5) for shifting to the feedback control (STP6) after operating the exhaust blower (10) with
An air supply / exhaust control method for a paint booth with air supply. The exhaust blower (10) is driven by a motor (14) whose frequency is controlled by an inverter (15), and in the exhaust air volume detection step (STP2), the air volume-power-control frequency characteristic curve of the exhaust blower (10). The supply / exhaust control method of a paint booth with supply air according to claim 1, wherein the exhaust air volume is obtained from the current control frequency and supply power based on the data. The exhaust blower (10) is driven by a motor (14) that frequency-controls the number of revolutions by an inverter (15), and in the preliminary adjustment step (STP3 to 5), the exhaust air volume is outside the allowable range of the appropriate exhaust air volume. When judged, based on the air volume-pressure characteristic curve data when the exhaust blower (10) is operated at the control frequency, the air volume of the exhaust resistance passing through the point corresponding to the detected exhaust air volume on the air volume-pressure characteristic curve. -Obtain pressure characteristic curve data, calculate an appropriate control frequency from the relational expression of the air flow-pressure characteristic curve of the exhaust blower (10) passing through the point corresponding to the appropriate exhaust air volume on the air flow-pressure characteristic curve data, The supply / exhaust control method for a paint booth with supply air according to claim 1 or 2, wherein the exhaust air blower (10) is operated at a control frequency and then the feedback control (STP6) is performed. When the paint booth with air supply (1) is divided into a plurality of work zones (4), supply and exhaust air by exhaust air volume detection step (STP2) and preliminary adjustment steps (STP3-5) for all work zones After performing the control, the feedback control (STP6) is performed on any one work zone (4), and then the feedback control (STP6) is sequentially performed on the other work zones (4 ...) adjacent thereto. The supply / exhaust control method of the painting booth with an air supply of Claim 1 thru | or 3 performed.

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