JPH031085Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to booths used in painting processes, cutting processes, etc., and is particularly applicable to booths with natural air supply and forced exhaust systems that are equipped with only an exhaust fan as the fan. It's about structure.

[Prior Art] In conventional booths using natural air supply and forced exhaust, it was only possible to vaguely ventilate the entire booth, and it was not possible to effectively ventilate specific parts within the booth. Therefore, in order to effectively ventilate a specific part of the booth, it was necessary to control the flow of air by adopting a natural air supply/forced exhaust system. That is, in addition to the exhaust fan, an air supply fan is required, which increases equipment costs, operating costs, maintenance costs, etc. compared to the natural air supply/forced exhaust system.

Another option is to open the air supply port at a specific position while maintaining the natural air supply and allow external air to flow into a specific part of the booth, but this is because the air supply is limited to a specific location. However, there was a problem that a dead space with no ventilation was created in the booth, and the ventilation efficiency in that area deteriorated.

[Purpose of the invention] This invention is designed to improve the natural air supply and forced exhaust system.
The purpose is to enable airflow control comparable to forced air supply/forced exhaust systems without creating dead space within the booth, and to efficiently ventilate specific areas within the booth.

[Structure of the invention] In order to achieve this purpose, the natural air supply/forced exhaust system booth of the invention has a porous hole in the air supply port through which air flows in from the outside as the air inside the booth is exhausted by the exhaust fan. A board is provided,
A collection hood that collects air from inside the booth is installed at the exhaust port that exhausts the air inside the booth.

[Effect of the invention] In such a natural air supply/forced exhaust system booth, air flows in through the perforated plate, so
The supply air will flow in from the entire area of the air inlet, that is, from the entire area of the perforated plate. Compared to the conventional case of a simple opening, in the device of the present invention, a pressure loss occurs due to the perforated plate in the flow of supply air, but the value of this pressure loss itself is not large because the air flow velocity is not so high. Therefore, in the case of a conventional simple opening, the supply air flows in from the part where it easily flows in, and the flow of supply air is forced to flow in from the entire area of the air supply port. will not occur.

Furthermore, the supply air amount distribution can be freely set by appropriately setting the aperture ratio distribution of the perforated plate, and the air flow within the booth can be freely controlled by setting the supply air amount distribution and the position of the collection hood.

[Effects of the invention] Therefore, it is possible to increase the air flow rate in specific parts of the booth without creating dead spaces, while securing the ventilation flow rate necessary for the work, processing, etc. environment in other parts. This makes it possible to control air flow comparable to a forced air supply/forced exhaust system booth. the result,
The ventilation efficiency of a specific part can be increased to a desired value while considering the balance with the overall ventilation efficiency. As a result, costs such as equipment costs, power costs, and maintenance costs for the air supply fan can be reduced to zero compared to the forced air supply/forced exhaust system.

[Embodiments] Preferred embodiments of the natural air supply/forced exhaust type booth of the present invention will be described below with reference to the drawings.

Figures 1 and 2 show a natural air supply/forced exhaust system booth according to an embodiment of the present invention.
This shows what is applied to the plasma fusing process.
In the figure, 1 indicates a booth. Inside the booth 1, there are robots 2, 3, and 4 that control the plasma cutting position.
A suitable number of optical sensors 5 are provided to detect the operating position of fusing. In this example of plasma melting, the workpiece 7 is melted while the melting operation position is controlled within the moving range 6 of the optical sensor 5.

One side of the booth 1 is configured as an air supply port 8 through which air flows in from the outside, and an exhaust port 9 is provided at the bottom of the other side to exhaust air from inside the booth 1. An exhaust fan 11 is connected to the exhaust port 9 via an exhaust duct 10, and the air in the booth is exhausted by the exhaust fan 11.

The air supply port 8 is provided with a perforated plate 12 that extends over its entire area. The perforated plate 12 has holes distributed over the entire area, and as described later, the aperture ratio of the perforated plate 12 is determined by the opening ratio of the perforated plate 12 at the operating position in the booth 1 (in the case of this embodiment, the operating position for plasma melting). It is desirable that the size is partially increased depending on the movement range 6) of the sensor 5 and the position of the collection hood 13. Further, it is desirable that a current plate (not shown) having a honeycomb structure or the like, for example, a current plate that gives directivity to the supplied air, be attached to the inside of the perforated plate 12.

Attached to the exhaust port 9 is a collection hood 13 that opens toward the inside of the booth 1 and extends in the horizontal direction to collect exhaust air from inside the booth 1. The collection hood 13 has its upper and lower plates open toward the inside of the booth 1.

In the natural air supply/forced exhaust booth configured as described above, the air in the booth 1 is collected by the collection hood 13 and forced through the exhaust port 9 through the exhaust duct 10 by the exhaust fan 11. is discharged. Along with this discharge, external air is naturally supplied from the air supply port 8 through the perforated plate 12.

This air supply is for ventilation in the booth 1, so the air supply rate is not very high, but since the air is inflowed through the perforated plate 12, the pressure loss is caused by the perforated plate. A small pressure difference occurs between the inside and outside of 12. Although this pressure is not large, it is sufficient to generate air flow, so the external air is transferred to the perforated plate 12.
, that is, the entire area of the air supply port 8 .
When a conventional air supply port is a simple opening, external air flows in from a place where it is easy to flow in, and the flow is left to its own control. The inflow of external air is guaranteed, and the direction of the flow is also guaranteed to be from the outside into the booth 1, or in the case of this embodiment, the horizontal direction.

Then, as in this embodiment, the air supply port 8 is connected to the booth 1.
If it is opened over almost the entire area of one side, the air flowing from the entire area of the air supply port 8 through the perforated plate 12 will pass through the entire area inside the booth 1 and reach the exhaust port 9, so that the booth The formation of dead spaces within 1 is easily prevented. Furthermore, if a rectifying plate with a honeycomb structure or the like is provided inside the perforated plate 12, the directivity of the supplied air can be further enhanced, so that external air can be introduced in a more desirable flow direction, and the flow inside the booth 1 can be further improved. All areas are efficiently ventilated.

When it is guaranteed that no dead space will be created in this way, it becomes possible to increase the ventilation efficiency of specific parts within the booth 1 while maintaining the overall ventilation efficiency at the required value. That is, by partially changing the aperture ratio of the perforated plate 12, a larger amount of external air can flow in from the part with a large aperture ratio than other parts, and this part with a large aperture ratio can be used as a booth. By setting the airflow in accordance with a specific part of the room, it becomes possible to control the air flow so as to increase the ventilation efficiency of that specific part. Exhaust port 9
The same can be said about the position setting of the booth 1, and the air flow inside the booth 1 can be freely set by the combination of the aperture ratio setting of the perforated plate 12 and the position setting of the exhaust port 9. For example, in the case of this embodiment, if the concentration of dust, mist, etc. within the movement range 6 of the optical sensor 5 is high,
Since the optical sensor 5 may become contaminated and malfunction, it is necessary to efficiently ventilate the transfer area 6 during processing. As a result of providing the perforated plate 12 at the air supply port 8, the air flow inside the booth 1 becomes as shown in FIGS. 3 and 4. Figure 3 is a velocity vector distribution diagram of the air flow inside booth 1, and Figure 4 is a streamline diagram of the air flow. As shown in the figure, the entire interior of booth 1 is ventilated without creating a dead space, and The area around the robot 2 as a specific part is particularly efficiently ventilated. Furthermore, the perforated plate 12
If you partially set the aperture ratio to be large, Robot 2
It is possible to further increase the ventilation efficiency of the surrounding area, and it is also possible to freely set the balance between the ventilation efficiency of a specific part and the ventilation efficiency of the whole.

As is clear from the above description, according to this embodiment, the perforated plate 12 is provided at the air supply port 8, and the perforated plate 12 is provided at the air supply port 8.
By appropriately setting the opening ratio of 2 and the position of the collection hood 13, it is possible to control the air flow equivalent to a forced air supply/forced exhaust type booth even though it is a natural air supply/forced exhaust type booth. The effect is that the ventilation efficiency of a specific part can be increased while ensuring ventilation of the entire interior of the booth 1. Therefore, the need for air supply fans, air supply ducts, and intake ports (outlets) can be eliminated, and equipment costs, power costs, and maintenance costs for these can be reduced to zero, significantly reducing costs including operating costs. You can measure the down.

Although this embodiment describes the booth 1 applied to a plasma fusing process, it is of course possible to apply the present invention to other processes such as electrostatic painting. , the shape of the exhaust port 9, etc. is not limited to that of this embodiment, but any arbitrary shape can be applied.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a natural air supply/forced exhaust system booth according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of the device shown in Fig. 1, and Fig. 3 is a booth of the device shown in Fig. 1. FIG. 4 is a flow line diagram of the air flow inside the booth based on the analysis results of FIG. 3. 1...booth, 2,3,4...robot, 5...
... Optical sensor, 6... Moving range of optical sensor, 7...
Workpiece, 8... Air supply port, 9... Exhaust port, 11...
Exhaust fan, 12...perforated plate, 13...collection hood.

Claims (1)

[Scope of utility model registration request] Forcibly exhaust the air inside the booth with an exhaust fan,
In natural air supply/forced exhaust system booths that allow air to flow in from outside as the air is being discharged, a perforated plate is installed at the air supply port through which air flows in, and a perforated plate is installed at the air supply port through which air flows in, and air from inside the booth is installed at the exhaust port through which the air inside the booth is discharged. A natural air supply/forced exhaust system booth featuring a collection hood that collects water.