JP2544897Y2 - painting booth - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a painting booth.
More specifically, the present invention relates to a coating booth provided with a venturi-type cleaning device for capturing paint mist in a coating chamber by gas-liquid contact.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a typical example of a conventional painting booth (for example, Japanese Utility Model Publication No. 56-133316).

Here, FIG. 4 is a cross-sectional view showing the entire structure, and FIG. 5 is a view showing a state where the cleaning liquid is atomized by the action of exhaust gas passing through the venturi section of the venturi-type cleaning apparatus.

In FIG. 4, reference numeral 1 denotes a painting room for painting a work W such as an automobile body. Exhaust ducts 10 and 10 are provided beside the coating room 1. Exhaust
The compartments 10 and 10 are separate rooms from the coating room 1. The exhaust duct 10 sucks and introduces exhaust air from the coating chamber 1 by driving an exhaust fan 11 provided at an upper portion.

[0005] Inside the exhaust duct 10, a venturi-type cleaning device 20A is provided. This cleaning device 20A is formed so that exhaust gas from the interior of the coating chamber 1 is brought into gas-liquid contact so that paint mist in the gas can be collected. Specifically, the cleaning device 20A includes a cleaning liquid outflow means (for example, the cleaning nozzle 21) and the cleaning liquid outflow means (2
Throttle means (Venturi section 31) disposed opposite to 1)
A, shielding plate 32).

When the exhaust gas E sucked and introduced from the coating chamber 1 into the exhaust duct 10 passes through the venturi section 31A of the venturi-type cleaning device 20A as shown in FIG. The cleaning liquid Q that has flowed out of the container 21 and has flowed down to the venturi portion 31A via the shielding plate 32 is atomized, and the atomized cleaning liquid Q collects paint mist and solvent vapor in the exhaust gas E. I have.

[0007]

Recently, more strict exhaust gas regulations (for example, American exhaust gas regulations, VOC regulations) are being enforced in order to further protect the environment.

In order to cope with such exhaust gas regulations, it is required to further increase the paint mist collection efficiency of the venturi-type cleaning device 20A.

Here, in the venturi type cleaning apparatus 20A, the cleaning liquid is atomized as the wind speed of the exhaust gas passing through the venturi section 31A increases, so that the gas-liquid contact becomes active and the collection efficiency is improved.

Therefore, in order to improve the collection efficiency of the paint mist, it is conceivable to increase the wind speed of the exhaust gas by reducing the opening area of the venturi portion 31A of the cleaning device 20A.

However, the exhaust gas venturi section 31A
Venturi section 31A as the wind speed passing through
, The pressure loss increases, and an excessive load is applied to the exhaust fan 11.

Therefore, in order to ensure the smooth operation of the painting booth, the capacity of the exhaust fan 11 must be increased and a large motor for driving the fan 11 must be provided, which poses a problem in terms of equipment economy. is there. In addition, noise is likely to be generated with the increase in the size of the exhaust fan 11 and the like, and there is a problem in the working environment.

An object of the present invention is to provide a coating booth capable of improving the collection efficiency of coating mist while ensuring smooth and economical operation of the apparatus in view of the above circumstances.

[0014]

The present invention is different from a painting room.
A venturi-type cleaning device disposed in the chamber and capable of collecting paint mist in the exhaust gas by bringing the exhaust gas from the coating chamber into gas-liquid contact, and an exhaust gas having an exhaust fan and passing through the venturi-type cleaning device And a vent duct capable of sucking and introducing the exhaust gas to the outside, wherein a part of the exhaust gas passing through the venturi-type cleaning device is suctioned to extract a part of the exhaust gas and the venturi portion of the venturi-type cleaning device.
Venturi from the outlet facing the inlet side of the venturi
Exhaust gas circulation means capable of increasing the wind speed of the exhaust gas passing through the section .

[0015]

According to the present invention, a part of the exhaust gas which has been cleaned by passing through the venturi type cleaning device is sucked by the exhaust gas circulating means and enters the venturi portion of the cleaning device at the inlet side.
It is blown directly toward .

As a result, the wind speed of the exhaust gas passing through the venturi increases, and the gas-liquid contact is more actively performed.

As described above, by circulating a part of the exhaust gas purified by passing through the venturi-type cleaning device to the venturi portion of the cleaning device, the wind speed of the exhaust gas passing through the venturi portion is increased. There is no need to increase the capacity of the exhaust fan. Therefore, the size of the exhaust fan can be easily reduced. In addition, the generation of noise from the exhaust fan is effectively suppressed.

As a result, the efficiency of collecting paint mist can be improved while ensuring smooth and economical operation of the apparatus.

[0019]

FIG. 1 is a view for explaining a main part of a first embodiment of the present invention, FIG. 2 is a view showing a second embodiment, and FIG. 3 is a venturi of a venturi type cleaning apparatus in the second embodiment. FIG. 4 is a view showing a state in which exhaust gas is blown out to a part by exhaust gas circulation means.

An embodiment of the present invention will be described with reference to the drawings.

(First Embodiment) As shown in FIG. 1, a coating booth according to the present embodiment uses a coating chamber 1, an exhaust duct 10, and an exhaust fan 11 (in this embodiment, a fan having a capacity of 10,000 m ³ / min is used. ), A venturi-type cleaning device 20 and an exhaust gas circulating means 40 which is a characteristic part of the main coating booth.

The same components as those shown in FIGS. 4 and 5 are denoted by the same reference numerals, and description thereof will be omitted or simplified.

Here, the venturi-type cleaning device 20
The exhaust gas from the interior of the coating chamber 1 is brought into gas-liquid contact so that paint mist, solvent vapor and the like in the exhaust gas can be collected. In the present embodiment, the cleaning device 20 is provided in the exhaust duct 10 and includes a cleaning nozzle 21 and throttle means (a venturi portion 31 and a shielding plate 32) disposed opposite to the cleaning nozzle 21. Have been.

The exhaust gas circulating means 40 is a part (E ') of the exhaust gas passing through the venturi-type cleaning device 20.
Is formed so as to be sucked and blown out to the venturi portion 32 of the cleaning device 20.

In this embodiment, the exhaust gas circulating means 40 is
Exhaust duct 10 between cleaning device 20 and exhaust fan 11
A part (E ') of the exhaust gas inside is sucked by the circulation fan 47 and blown out from the outlet ( blow nozzle 45 ) facing the inlet side of the venturi section 31.

More specifically, the exhaust gas circulation means 40
Is configured to include another return pipe 41 in the blowing nozzle 45 and the circulation fan 47 described above. The suction part 42 of the return pipe 41 is provided so as to be able to suck a part (E ′) of the exhaust gas in the exhaust duct 10 between the cleaning device 20 and the exhaust fan 11. Also, the discharge part 43 of the return pipe 41
Is provided so as to be able to blow out exhaust gas E ′ to the venturi section 31 of the cleaning device 20 via the blowing nozzle 45.
A circulation fan 47 is connected to an intermediate portion of the return pipe 41. The circulation fan 47 discharges an exhaust gas E ′ that can increase the wind speed of the exhaust gas E passing through the venturi section 31 from the blowing nozzle 45 (in this embodiment, 100 V).
m ³ / min).

Further, the discharge portion 43 of the return pipe 41
The upper portion of the washing water suction pipe 51 is fitted so that the tip opening 52 thereof faces the blow nozzle 45. The cleaning water suction pipe 51 is disposed so that its lower end suction port is immersed in the cleaning water Q stored in the lower part of the main coating booth.

Therefore, when the circulation fan 47 is driven during the operation of the coating booth, a part (E ′) of the exhaust gas passing through the venturi-type cleaning device 20 is sucked from the suction portion 42 of the return pipe 41 and flows through the pipe 41. Circulating fan 4
7. The air is blown out to the venturi section 31 via the discharge section 43 and the blow-out nozzle 45. At this time, the cleaning water Q is sucked up through the cleaning water suction pipe 51 by the negative pressure generated by the exhaust gas E ′ blown from the blowing nozzle 45 and flows out from the blowing nozzle 45.

Next, the operation will be described.

Exhaust gas E containing paint mist and the like generated in the coating chamber 1 is sucked into the exhaust duct 10 by the exhaust fan 11. And the venturi type cleaning device 2
Pass through zero.

Here, the speed of the exhaust gas E is increased by the exhaust gas E ′ blown from the blow nozzle 45 of the exhaust gas circulating means 40 when passing through the venturi section 31 of the cleaning device 20, and the exhaust gas E flows out of the cleaning nozzle 21. The cleaning water Q comes into contact with the cleaning water Q and flows while being atomized.

At this time, the cleaning water Q is atomized by the exhaust gas (E, E ') having a high wind speed, so that the gas-liquid contact is activated and the paint mist in the exhaust gas (E, E') is increased. Is effectively collected.

As described above, by circulating a part of the exhaust gas that has been cleaned by passing through the cleaning device 20 to the venturi portion 31 of the cleaning device 20, the wind speed of the exhaust gas passing through the venturi portion 31 is increased. Therefore, it is not necessary to increase the capacity of the exhaust fan 11. Therefore, the size of the exhaust fan 11 can be easily reduced. In addition, the generation of noise from the exhaust fan 11 is effectively suppressed. Exhaust air in a room separate from the coating room 1
In the duct 10, the venturi section 31
Because part of the exhaust gas is blown out toward the entrance side of the
Spray painter without disturbing the air flow in 1
Not as badly affected.

Since the circulation fan 47 only needs to have a capacity to blow out the exhaust gas E 'which can increase the wind speed of the exhaust gas E locally passing through the venturi section 31 from the blowing nozzle 45, the capacity is small. As a result, the size of the exhaust fan circulating means 40 (and thus the painting booth) is not increased.

Further, in this embodiment, the cleaning water Q is sucked up through the cleaning water suction pipe 51 as the exhaust gas E 'is blown out from the blowing nozzle 45, and flows out from the blowing nozzle 45. The cleaning water Q is atomized by the exhaust gas (E, E ') passing through the venturi section 31, and effectively collects paint mist in the exhaust gas (E, E').

Therefore, the paint mist in the exhaust gas is
In the venturi-type cleaning device 20, the exhaust gas circulation means 40 and the cleaning water suction pipe 51 cooperate to collect the water more effectively.

Thus, according to this embodiment, part (E ') of the exhaust gas passing through the venturi-type cleaning device 20
The exhaust gas circulating means 40 capable of sucking air and blowing it to the venturi section 31 of the cleaning device 20 is provided, so that the wind speed of the exhaust gas passing through the venturi section 31 without imposing an excessive load on the exhaust fan 11 And the gas-liquid contact can be activated. Therefore, the efficiency of collecting paint mist can be improved while ensuring smooth and economical operation of the apparatus.

The exhaust gas circulating means 40 circulates the exhaust gas from the exhaust duct 10 between the cleaning device 20 and the exhaust fan 11 to the venturi section 31 of the cleaning device 20. It is possible to increase the wind velocity of the exhaust gas passing through the venturi section 31 without breaking the balance between the capacity and the exhaust gas, thereby improving the efficiency of collecting the paint mist.

Further, since the cleaning water Q is drawn up from the cleaning water suction pipe 51 using the exhaust gas or the like blown out from the blowing nozzle 45 and is discharged from the blowing nozzle 45 to the venturi section 31, the venturi section 31 is used. The gas-liquid contact in the above is further activated, and the collection efficiency of the paint mist is further improved.

Further, since the exhaust gas circulating means 40 is composed of a return pipe 41, a blowing nozzle 45 and a circulating fan 47 and has a small number of parts, the circulating means 40 can be easily installed even in an existing (or newly installed) painting booth. As a result, the efficiency of collecting paint mist can be improved.

Furthermore, it is possible to selectively use the exhaust gas circulating means 40 only in the paint booth where the paint mist is discharged particularly frequently, and from this point, it is possible to improve the economic efficiency. .

(Second Embodiment) As shown in FIG. 2, the coating booth according to the second embodiment has a structure in which a venturi-type cleaning device 20 'is disposed below the coating chamber 1, and the exhaust gas It is configured to include a circulation means 40 '.

The same components as those shown in FIGS. 1 and 4 are denoted by the same reference numerals, and description thereof will be omitted or simplified.

Here, the venturi-type cleaning device 20 '
Is composed of a cleaning nozzle 21 ', a venturi section 31' and the like.

The exhaust gas circulating means 40 'includes a return pipe 41, a blowing nozzle 45 and a circulating fan 47 having the same structure as in the first embodiment.

Therefore, by using the exhaust gas circulating means 40 'having such a structure, the wind speed of exhaust gas passing through the venturi section 31' is increased without imposing an excessive load on the exhaust fan 11, and the paint mist collection efficiency is increased. Can be improved.

Therefore, the efficiency of collecting paint mist can be improved while ensuring smooth and economical operation of the apparatus.

In the first and second embodiments, the exhaust gas circulating means (40, 40 ') is provided between the cleaning device (20, 20') and the exhaust fan (11, 11). Is blown out to the venturi section (31, 31 ') of the cleaning device (20, 20'). However, the exhaust gas at the downstream side of the exhaust fan 11 and not reaching the honeycomb rotor (not shown) for VOC processing is removed. Venturi Club (3
1, 31 '). Even with such a configuration, it is possible to smoothly and efficiently perform the solvent adsorption without disturbing the balance between the exhaust gas processing capacity on the honeycomb rotor side and the exhaust gas.

As in the first embodiment, the exhaust gas circulating means 40 'can be selectively used only in the paint booth where the paint mist is discharged particularly frequently, and the economic efficiency can be further improved. Can be achieved.

[0050]

[Effect of the invention] According to the present invention, it is installed in a separate room from the painting room.
By sucking a portion of the exhaust gas passing through the been venturi-type cleaning apparatus on the inlet side of the venturi section of the cleaning device
The exhaust gas circulating means that can be blown out is provided, so that the exhaust gas passing through the inlet side of the venturi section is increased in wind velocity without undue load on the exhaust fan to activate gas-liquid contact. be able to. Therefore, the efficiency of collecting paint mist can be improved while ensuring smooth and economical operation of the apparatus.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a main part of a first embodiment of the present invention.

FIG. 2 is a diagram showing a second embodiment.

FIG. 3 is a view showing a state in which exhaust gas is blown out from an exhaust gas circulating means to a venturi section of a venturi-type cleaning device in a second embodiment.

FIG. 4 is a cross-sectional view showing the overall configuration of a conventional painting booth.

FIG. 5 is a view showing a state in which a cleaning liquid is atomized by the action of exhaust gas passing through a venturi section of a venturi-type cleaning device in a conventional painting booth.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Exhaust duct 11 Exhaust fan 20 Venturi type washing device 31 Venturi part 40 Exhaust gas circulation means

Claims (1)

(57) [Scope of request for utility model registration] And 1. A coating chamber exhaust gas by gas-liquid contact trapped possible Venturi type cleaning device paint mist in the exhaust gas from the disposed and having painted chamber separate room and, an exhaust fan An exhaust duct capable of sucking and introducing the exhaust gas passing through the venturi-type cleaning device and exhausting the exhaust gas to the outside, wherein a part of the exhaust gas passing through the venturi-type cleaning device is sucked and the venturi-type device is suctioned. The venturi blows out from the outlet facing the inlet side of the venturi part of the cleaning device.
A paint booth characterized by having exhaust gas circulating means capable of increasing the wind speed of exhaust gas passing through the coating section.