JP2514044Y2 - Air supply / exhaust control device for paint boots for automobiles - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply / exhaust control device for a paint booth for an automobile, which can control the supply / exhaust condition in the paint booth according to the ventilation condition of a mist removing filter installed in an exhaust passage.

[0002]

2. Description of the Prior Art A car booth is equipped with a painting booth equipped with a supply / exhaust system for painting and drying repair vehicles.
When painting in the booth, the room is set to a constant air supply / exhaust state, and the overmist is collected and filtered and discharged to protect the worker and prevent the adhesion of fine foreign matter to the coated surface. , Trying to get a good finish on the painted surface

In the air supply / exhaust equipment, a filter for purifying air supply is provided at a proper position of the air supply passage, and a mist removing filter for preventing discharge of paint mist to the atmosphere is provided at a proper position of the exhaust passage. However, these filters have the problem that dust, foreign matter, or paint mist may become clogged due to use over time, causing the air supply / exhaust condition to gradually deteriorate, which adversely affects the work environment and the quality of the painted surface. Yes,
The improvement was expected more than before.

Therefore, conventionally, an operator senses the deterioration of the air supply / exhaust condition, adjusts the air volume of the air supply / exhaust blower, inspects each filter, and cleans or replaces them as necessary. For example, as in Japanese Examined Patent Publication No. 12551/1990, a wind speed sensor installed in a coating booth adjusts a damper of a blower on the air supply side or controls a blade angle of the blower to adjust an air supply amount. I was doing.

[0005]

[Problems to be Solved by the Invention] However, if the operator senses, the sense of the operator cannot be obtained uniformly, and if the wind sensor is used, Since the air blower on the air supply side is controlled based on the information, if there is a clogging of the mist removal filter of the exhaust system that tends to occur over time, there is a limit to the control and there is a problem of lack of reliability. there were. By the way, there are a hot-wire type sensor and a vane type sensor in the conventional wind speed sensor. Of these, the former is apt to cause an error due to temperature, and generally 80 ° C to 120 ° C.
It cannot be used in painting booths for automobile repairs that require hot air at ℃. In addition, the latter is not suitable for measuring low-speed wind of 0.2 to 0.5 m / sec, which is generally suitable for measurement of medium-speed or higher wind speed and is defined by the Labor Standards Act as a coating booth for automobile repair. Can not obtain accurate detection accuracy.

The present invention solves such a problem and can accurately detect the supply / exhaust state regardless of the temperature and the supply / exhaust speed conditions, and the blower on the supply / exhaust side is determined by the ventilation state of the filter installed in the supply / exhaust passage. Accurately determine the need for control of
An object of the present invention is to provide an air supply / exhaust control device for an automobile coating booth, which is designed to achieve stable control and reduce the load on the air supply / exhaust blower.

[0007]

Therefore, the air supply / exhaust control device for a coating booth for an automobile according to the present invention includes an air supply / exhaust side blower capable of supplying / exhausting the coating booth and a filter provided in the air supply / exhaust passages thereof. An automobile having a controller having a sensor provided at a downstream side position of the air supply filter and a downstream side position of the exhaust side filter in the coating booth, and capable of controlling the operation of the blower based on an input signal of the sensor. In the supply / exhaust side control device of the coating booth, a pressure sensor is installed at a substantially central position in the coating booth and a downstream position of the exhaust side filter, and the pressure difference between them is compared with a predetermined value stored in the controller, The necessity of controlling the air supply / exhaust side blower can be determined, and the operation of the air supply / exhaust side blower can be controlled according to the pressure difference, and the air supply / exhaust state can be accurately detected regardless of the temperature or the air supply / exhaust speed conditions. And In addition, the necessity of controlling the air supply / exhaust side blower is accurately determined by the ventilation state of the filter installed in the air supply / exhaust passage, and stable control of the air supply / exhaust side blower and the load on them are reduced. To do.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 is a coating booth installed on a floor surface 2 of an automobile repair shop, and an air supply filter 3 is provided inside the booth. An air supply chamber 4 and a coating chamber 5 are vertically divided, and an exhaust groove 6 is provided on a floor surface 2 in the coating chamber 5.

An air supply device 7 and an exhaust device 8 are provided outside the coating booth 1. Of these, the air supply device 7 is provided with an air supply filter 9 and an inverter blower 10 which is an air supply side blower. Blower duct 11 between 10 and air supply chamber 4
Is arranged.

The exhaust device 8 is a casing 1 communicating with the exhaust groove 6.
A mist removing filter 13 that is an exhaust side filter provided in 2 and an inverter blower 14 that is an exhaust side blower are provided, and the discharge port of the blower 14 is communicated with the atmosphere side.

Pressure sensors 15 and 16 are provided at a substantially central position in the coating chamber 5 and in a predetermined position on the housing 12 downstream side of the mist removing filter 13 or on the atmosphere open side. It is possible to input to.

The controller 17 has a built-in amplifier circuit, a comparison / determination circuit, an arithmetic circuit and a control circuit, and the arithmetic circuit corresponds to the optimum supply / exhaust state of the coating chamber 5.
And the pressure difference value (range) between the housing 12 and the atmosphere are stored in advance. Then, the controller 17 calculates the pressure difference between the sensors 15 and 16 on the condition of the inputs from the sensors 15 and 16, compares and determines the pressure difference based on the stored information, and transmits the processing result to the control circuit to permit the operation. If the pressure difference is more than
That is, when the control is required, the control signal is output to each of the inverter blowers 10 and 14 so that the rotational speeds of the blowers 10 and 14 can be changed.

In preparation for the case where the pressure difference exceeds the control range, the inspection instruction signal of the mist removing filter 13 is input from the controller 17 to the operation panel or the like before the control range is exceeded. Is desirable.

In the figure, reference numeral 18 is a grating installed on the opening edge of the exhaust groove 6 so that a collection vehicle (not shown) can be mounted on it. Is housed.

[0015]

In the air supply / exhaust control device for the automobile coating booth constructed as described above, the air supply / exhaust devices 7, 8 are used during the painting.
Is driven, and the outside air is taken in through the air supply filter 9 by the air supply side inverter blower 10, and this is the blower duct 1
1 moves to the air supply chamber 4 and is sent to the coating chamber 5 via the air supply filter 3.

On the other hand, the air containing the paint mist is applied to the painting chamber 5
The inside is moved downward, is guided from the exhaust groove 6 into the housing 12, the paint mist is removed by the mist removing filter 13 in the housing 12, and then discharged to the atmosphere by the exhaust side inverter blower 14.

At the time of such coating, the controller 17
The control is started, and signals from the pressure sensors 15 and 16 are input to the controller 17 every moment. The controller 17 calculates the pressure difference between them on the condition of this input signal, makes a comparison determination based on the stored information stored in advance, and transmits the processing result to the control circuit. In this case, the supply / exhaust state between the air supply / exhaust devices 7 and 8 is detected by the pressure sensors 15 and 16 instead of the conventional wind speed sensor.
Moreover, it is possible to detect a wide range of supply and exhaust speeds. Further, since the pressure sensor 15 is installed in substantially the center of the coating chamber 5, compared with the case where the pressure sensor 15 is installed near the filter 3 in the immediate vicinity of the air outlet, the supply air is prevented from being disturbed and stable supply / discharge is performed. The pressure condition of the path can be detected.

When the pressure difference is equal to or larger than the allowable pressure difference, that is, when the control is required and the control range of the controller 17 is satisfied, for example, the paint mist adheres to the mist removing filter 13, causing clogging. While the pressure in the casing 12 on the downstream side of the filter 13 decreases, the coating chamber 5
The above situation is brought about when the balance between the supply and exhaust of air in the interior is lost and an excessive supply is achieved, the pressure in the coating chamber 5 rises, and the pressure difference between them increases.

However, the similar situation is not limited to the above-mentioned trouble of the exhaust system, but the supply filter 3 or 9 is clogged, the pressure in the coating chamber 5 is lowered, and the pressure in the housing 12 is reduced. It is also caused by troubles in the air supply system, where the differential pressure drops below the permissible level.

Therefore, the controller 17 calculates a control signal to each of the inverter blowers 10 and 14 based on the pressure difference and outputs the processed signal to the blowers 10 and 14, so that each of the inverter blowers 10 and 11 is processed. Changes the rotation speed based on the signal, for example, the rotation speed of the air supply side inverter blower 10 is reduced, and the rotation speed of the exhaust side inverter blower 10 is increased within a range where overload operation does not occur. The pressure difference is corrected to the allowable value. Therefore, even if the mist removing filter 13 is clogged, the optimum supply / exhaust state in the coating chamber 5 is restored.

As described above, according to the present invention, the mist removing filter 1 which is easily generated in the exhaust system under the normal use of the coating booth 1.
Since the failure of the supply / exhaust state in the coating chamber 5 due to the adherence of the paint mist of No. 3 is automatically resolved, the failure of the supply / exhaust state in the coating chamber 5 caused by the air supply system can be resolved. Blower 1 with wider control range and air supply / exhaust side
By controlling both 0 and 14, comprehensive and fine-grained control is possible and its reliability is improved.

In the above embodiment, depending on the ventilation state of the mist removing filter 13, the blowers 10 and 14 on the air supply and exhaust side are provided.
Although both of them are controlled, either one of them may be controlled, and by doing so, the configuration is simplified and the equipment cost is suppressed accordingly.

[0023]

As described above, the supply / discharge device for the automobile coating booth according to the present invention has the pressure sensors installed at the substantially central position in the coating booth and the downstream side position of the exhaust side filter. Compared to the detection method using a wind speed sensor, it is more immune to errors due to temperature changes in the supply and exhaust, and can detect a wide range of supply and exhaust speeds, and a pressure sensor is installed at the approximate center of the coating booth. As compared with the case where the filter is installed in the vicinity of the filter inside, the disturbance of the air flow can be avoided and a stable pressure state of the supply / discharge path can be detected. Further, the present invention compares the pressure difference between the coating booth and the exhaust side filter with a predetermined value stored in the controller to determine whether control of the air supply / exhaust side blower is necessary, and to supply the pressure in accordance with the pressure difference. Since the operation of the exhaust side blower is controlled, it is possible to obtain a stable control operation, reduce the load on the supply / exhaust side blower, and obtain a good operating condition.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Coating booth 3,9 Air supply side filter 10 Air supply side blower 13 Exhaust side filter 14 Exhaust side blower 15, 16 Pressure sensor

Claims (1)

(57) [Scope of utility model registration request] Has a 1. A paint booth can supply and exhaust of air supply and exhaust blower, and a filter provided in their supply and exhaust passage, the coating
The downstream side of the air supply filter in the booth and the exhaust side filter.
Sensor on the downstream side of the
Controller that can control the operation of the blower based on the
The sheet exhaust side control apparatus for an automobile painting booth with La, under the exhaust side filter and the substantially central position in the paint booth
Install a pressure sensor at the position on the flow side and measure the pressure difference between them.
Compared with the specified value stored in the controller
Determines whether control of the machine is necessary, and supplies or exhausts air according to the pressure difference.
An air supply / exhaust side control device for an automobile coating booth, which is capable of controlling the operation of a side blower .