JPS6224144B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a synchronous control device for the supply and exhaust air volume of a painting spraying chamber, and in particular, the present invention relates to a synchronous control device for controlling the supply and exhaust air volume of a painting spraying chamber.
This invention relates to a synchronous control device for the supply and exhaust air volume of a painting spraying room, which allows the air volume to be changed without causing a difference in the air supply and exhaust air volume, thereby ensuring good spraying work and reducing loss of power.

Conventionally, when spraying the bodies of automobiles, etc. in a spray room, air was supplied to the spray room from one direction and discharged from the other direction, resulting in a fairly high wind speed of about 0.5 m/sec. A flow of air was generated, and this air flow allowed for good spraying work.

By the way, when workers change shifts, during breaks or when the body is not in the spraying room for some reason, the spraying work is not being carried out.
The air supply and exhaust air speed may be slowed down to about 0.2 m/sec.

However, when changing the air supply and exhaust air speed in the blowing chamber as described above, if the type and characteristics of the air supply and exhaust blowers are different, differences will occur in the air volume of the air supply and exhaust.
Various problems were occurring.

What is shown in Figure 1 is the change in wind speed over time caused by an air supply blower (for example, a variable blade axial flow blower), and what is shown in Figure 2 is the change in wind speed caused by an exhaust air blower (for example, a centrifugal blower). The vertical axis shows the wind speed V (m/sec), and the horizontal axis shows the time T (sec). Figures 1 and 2
As can be seen from the figure, when the wind speed is changed from slow to fast, the air supply and exhaust air speeds change over time.
It changes in almost the same curve between T ₁ .
On the other hand, when the wind speed is changed from fast to slow, the supply air speed by the variable blade axial flow blower changes suddenly during time T ₂ , while the exhaust air speed by the centrifugal blower changes. , changes slowly over a longer period of time T ₃ . Therefore, a difference occurs in the air volume of supply and exhaust. This means that the speed at which the fan tilt is changed using the blade angle controller of a conventional variable blade axial flow blower is
Because the blade angle was controlled by a single controller, the speed at which the fan tilt changed when increasing or decreasing the air volume was the same, making it impossible to arbitrarily control changes in wind speed.

As a result, for example, if the air volume of the supply air is larger than the air volume of the exhaust air, the air supplied into the blowing chamber by the variable angle blade axial flow blower will flow toward the doorway of the blowing room and exit from the doorway. It leaked out, causing a huge loss of power. On the other hand, if the air volume on the exhaust side is larger than the air volume on the supply side, negative pressure will be created in the spraying chamber, and air mixed with foreign matter will flow into the spraying chamber from the outside, causing debris to come into contact with the body during spraying work. There was an inconvenience that it would stick. Because of this situation, conventionally, even when the air volume of the air supply and exhaust in the spraying room could be reduced during breaks, etc., the air volume of the air supply and exhaust was kept high, which resulted in a large power loss. It was hot.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the prior art, and its purpose is to control either one of the air supply and exhaust volumes in a painting spraying chamber with a variable blade axial flow blower. In a device for controlling the air supply and exhaust volume of a painting spraying chamber, the other of which is controlled by a centrifugal blower, the inclination of the fan of the variable blade axial flow blower and the speed at which the inclination is changed are determined in the case of an increase in the air volume of the spraying chamber. By providing a pair of controllers that can be independently controlled in the case of decrease and decrease, the air volume of the variable blade axial flow fan is always matched with the air volume of the centrifugal fan, and the air volume of the air supply and exhaust in the blowing chamber is adjusted to the air volume of the air supply and exhaust. The purpose is to change the air volume without causing a difference in air volume. Another purpose is to prevent the air supplied into the blowing chamber from flowing out from the entrance and exit of the blowing chamber in the case of transient changes in the air supply and exhaust air volume.
Furthermore, by preventing air mixed with dirt and the like from flowing into the spraying chamber, it is possible to prevent loss of power and to perform a good spraying operation.

In short, the present invention provides a control device for the supply and exhaust volume of a painting spraying chamber, in which one of the supply and exhaust volumes in the painting spraying chamber is controlled by a variable blade axial flow blower and the other by a centrifugal blower. , a pair of controllers for controlling the blade angle controller and the tilt of the fan of the variable blade axial flow blower and the speed at which the tilt is changed by controlling the blade angle controller; The variable blade axial flow blower is used independently for increases and decreases, respectively, so that when the air volume in the blowing chamber is increased or decreased, the air volume of the variable blade axial flow blower matches the air volume of the centrifugal blower. It is characterized by the following structure.

The present invention will be explained below based on embodiments shown in the drawings. The synchronous control device 1 for the supply and exhaust amount of a painting spraying room according to the present invention includes a variable blade axial flow blower 2 as an example of a supply air blower, and a centrifugal blower as an example of an exhaust blower, that is, rotation by a DC motor. Each control target is a limit load fan with numerical control (not shown).

The synchronous control device 1 includes first and second controllers 3 and 4, a three-way solenoid valve 5, and a blade angle manipulator 6.
and a fan 7 of the variable blade axial flow blower 2, and the first and second controllers 3, 4 are controlled by an air supply control device operated manually or by a computer. . The first controller 3 is activated when changing the air supply wind speed from a slow state to a fast state, and the second controller 4 is activated when changing the air supply wind speed from a fast state to a slow state. Air flows into each controller through a pipe 10.

The three-way solenoid valve 5 includes a solenoid 11 and a spool valve 12, and the spool valve can be slid in the vertical direction by the solenoid 11. Further, the spool valve is formed with first and second ports 12a and 12b, respectively. The first port 12a is connected to the first controller 3, and the second port 12b is connected to the second controller 4. Communication is possible via a pipe 10.

The blade angle controller 6 communicates with the three-way solenoid valve 5 and the fan 7 through a pipe 10, and allows air controlled by the first and second controllers 3, 4 and the three-way solenoid valve 5 to flow. The inclination of the fan 7 and the speed at which the inclination is changed are controlled. There are multiple fans 7, for example, four fans 7.
It is equipped with

When the air volume of the air supply increases, the first controller 3 is activated, and the first controller and the first port 12a of the spool valve 12 are brought into communication, and the air volume of the air supply decreases. If you do,
The second controller 4 is actuated to connect the second controller and the second port 12b of the spool valve 12.
This makes it possible to independently control the tilt of the fan 7 and the speed at which the tilt is changed via the blade angle controller 6 when the air volume increases and decreases, respectively. ing. In addition, the exhaust air volume can be changed according to the characteristics of the limit road fan by controlling the rotational speed of the limit road fan with an exhaust control device. The changes may be the same.

The present invention is configured as described above, and its operation will be explained below. Normally, when spraying work on the body of a car is being performed, that is, when a large amount of air is required in the spraying chamber, the speed of the air supplied into the spraying chamber by the variable blade axial flow blower 2 is The speed of air discharged from the blowing chamber by the limit load fan and the limit road fan are both set to about 0.5/msec. In addition, when changing workers, during breaks or when the body is not in the spraying room for some reason, the air supply and exhaust air speed is set to about 0.2 m/sec.

In Figure 5, the vertical axis represents the wind speed V (m/sec), the horizontal axis represents the time T (sec), and the solid line represents the air supply wind speed.
The exhaust wind speed is shown by a phantom line.

Then, during time T ₄ , the air supply and exhaust air speed is 0.2 m/
When increasing the wind speed from sec to 0.5m/sec,
The first controller 3 is activated, and the spool valve 12 moves to the lowest position as shown in FIG. , blade angle controller 6
is operated to control the inclination of the fan 7 and the speed at which the inclination is changed, and the air supply air speed changes as shown by the solid line. On the other hand, the exhaust air speed changes as shown by a virtual line by controlling the rotational speed of the DC motor.
When the air supply and exhaust air speeds are increased in this way, the air supply and exhaust air speeds change in almost the same state. Also, during time T ₅ , the air supply and exhaust air speed changed from 0.5 m/sec to 0.2 m/sec.
When reducing the wind speed to m/sec, the second controller 4 is activated and the spool valve 12 is moved to the uppermost position as shown in FIG.
The port 12b of the fan 7 and the second controller 4 communicate with each other through a pipe 10, and the blade angle controller 6 is operated to control the tilt of the fan 7 and the speed at which the tilt is changed. Changes to On the other hand, the exhaust air speed changes as shown in a virtual line by controlling the rotational speed of the DC motor using the exhaust control device of the limit road fan. Even when the air supply and exhaust air speeds are decreased in this way, the air supply and exhaust air speeds change along almost the same curve.

As described above, according to the present invention, the first controller 3 can be controlled manually or by a computer to control the first controller 3 when the air volume increases in the spraying chamber, and the second controller 4 when the air volume decreases. The blade angle controller 6 is controlled to control the tilt of the fan 7 of the variable blade axial flow blower 2 and the speed at which the tilt is changed, thereby adjusting the air volume of the variable blade axial flow fan 2 and the air volume of the limit load fan. Since they match, it is possible to eliminate the difference in the air supply and exhaust air volume in a transient case where the air supply and exhaust air volume in the spraying chamber is changed.

In addition, in the embodiment, the variable blade axial flow blower 2,
Although a limit load fan is used as an example of a centrifugal blower for exhaust air, a limit load fan may be used for supply air and a variable blade axial flow blower 2 may be used for exhaust air.

Since the present invention is constructed and operates as described above, one of the air supply and exhaust volumes in the painting spraying chamber is controlled by a variable blade axial flow blower, and the other is controlled by a centrifugal blower. In a control device for supply and exhaust volume of a painting spray room, the tilt of the fan of a variable blade axial flow blower and the speed at which the tilt is changed are independently controlled when the air volume of the spray room is increased and when it is decreased. Since a pair of controllers are provided, the air volume of the variable blade axial flow fan can always be matched to the air volume of the centrifugal fan, and the air volume of the air supply and exhaust in the blowing chamber can be adjusted to prevent differences in air volume between the air supply and exhaust. The effect is that it can be changed without any changes. It also prevents the air supplied into the spraying chamber from flowing out from the entrance and exit of the spraying chamber in the case of transient changes in the air supply and exhaust air volume, and prevents air contaminated with dust from flowing into the spraying chamber. Since it is possible to prevent this, various excellent effects can be obtained, such as being able to prevent loss of power and performing a good spraying operation.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the change in wind speed with respect to time in a transient case of changing the wind speed of a conventional variable blade axial flow fan.
Diagrams similar to those shown in the figure, FIGS. 3 to 5 relate to the embodiment of the present invention, and FIG. 3 is a vertical cross-sectional front view of the main part of the synchronous control device in a state where the wind speed of the supply air is reduced. , Fig. 4 is a partial longitudinal cross-sectional front view similar to Fig. 3 in a state where the air supply air speed is increased, and Fig. 5 shows the change in wind speed with respect to time in a transient case where the air volume of air supply and exhaust is changed. FIG. 2 is a variable blade axial flow blower which is an example of a blower for air supply; 3 is a first controller of the variable blade axial flow blower; 4 is a second controller; 6 is a blade angle controller; and 7 is a fan. .

Claims (1)

[Claims] 1. In a control device for the supply and exhaust volume of a painting spraying chamber in which one of the supply and exhaust volumes in the painting spraying chamber is controlled by a variable blade axial flow blower and the other by a centrifugal blower, the blade angle is controlled. a pair of controllers for controlling the blade angle manipulator to control the tilt of the fan of the variable blade axial flow blower and the speed at which the tilt is changed; and when the air volume in the blowing chamber is increased or decreased, the air volume of the variable blade axial flow blower is configured to match the air volume of the centrifugal blower when the air volume in the blowing chamber is increased or decreased. The feature is a synchronous control device for the supply and exhaust volume of the painting spray room.