Dry paint booth

Abstract

This dry-type paint booth provides a solution that prevents deterioration of the external environment even if paint mist adhering to the outside of the filter is stirred up during filter replacement. [Solution] A dry painting booth is provided in which an exhaust port is formed in the side wall of the dry painting booth, an exhaust passage communicating with the exhaust port is provided on the outside of the side wall of the dry painting booth and adjacent to the side wall of the dry painting booth, and a paint mist collection filter is provided in the exhaust passage in contact with the exhaust port, and a trolley passage for a trolley carrying the filter is provided in the exhaust passage, and the filter replacement work is performed in the trolley passage.

Description

Technical Field

[0001] The present invention relates to a dry painting booth.

Background Art

[0002] A dry painting booth is disclosed in Patent Document 1, in which an exhaust port is formed in a side wall of the dry painting booth, an exhaust passage communicating with the exhaust port is disposed outside the side wall of the dry painting booth and adjacent to the side wall of the dry painting booth, a paint mist collection filter is disposed in the exhaust passage in contact with the exhaust port, and a door for filter replacement is disposed on a side wall of the exhaust passage separated from the side wall of the dry painting booth. The dry painting booth of Patent Document 1 has an advantage that the filter can be easily replaced.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The dry painting booth of Patent Document 1 has a problem that paint mist adhering to the inlet of the filter may fly up during filter replacement, leading to deterioration of the external environment. In view of the above problems, the present invention provides a dry painting booth in which an exhaust port is formed in a side wall of the dry painting booth, an exhaust passage communicating with the exhaust port is disposed outside the side wall of the dry painting booth and adjacent to the side wall of the dry painting booth, a paint mist collection filter is disposed in the exhaust passage in contact with the exhaust port, and even if paint mist adhering to the inlet of the filter flies up during filter replacement, it does not cause deterioration of the external environment.

Means for Solving the Problems

[0005] To solve the above problems, the present invention provides a dry painting booth in which an exhaust port is formed in the side wall of the dry painting booth, an exhaust passage communicating with the exhaust port is provided on the outside of the side wall of the dry painting booth and adjacent to the side wall of the dry painting booth, and a paint mist collection filter is provided in the exhaust passage in contact with the exhaust port, and a trolley passage for a trolley carrying the filter is provided in the exhaust passage, and the filter replacement work is performed in the trolley passage. Since there is a trolley passage within the exhaust passage, workers can enter the trolley passage and perform filter replacement work within the trolley passage. Even if paint mist attached to the filter inlet is stirred up during filter replacement, it will not leak into the external environment. By sucking up and removing the stirred-up paint mist within the exhaust passage, or by waiting for the stirred-up paint mist to settle on the floor before removing the trolley with the filter from the exhaust passage, contamination of the external environment can be prevented. In a preferred embodiment of the present invention, the side wall of the dry painting booth is the side wall of the painting room. In a preferred embodiment of the present invention, the side wall of the dry painting booth is the side wall of the exhaust chamber. The present invention is applicable to both small dry paint booths that do not have an exhaust chamber below the painting chamber, and large dry paint booths that do have an exhaust chamber below the painting chamber. In a preferred embodiment of the present invention, a primary filter is provided adjacent to the exhaust port, a secondary filter is provided within the exhaust passage and above the primary filter, and a trolley passage for a trolley carrying the primary filter is provided within the exhaust passage. If the height of the side walls of the dry paint booth is small and the secondary filter can be replaced from the trolley passageway, it is preferable to provide only the trolley passageway. In a preferred embodiment of the present invention, in addition to the trolley passage, a secondary filter replacement work passage is provided within the exhaust passage and above the trolley passage. If the side walls of the dry-type paint booth are so high that it is not possible to replace the secondary filter from the trolley walkway, it is desirable to provide a walkway for replacing the secondary filter above the trolley walkway. In either of the above cases, the primary and secondary filters can be replaced separately, thus improving maintainability. In a preferred embodiment of the present invention, the primary filter is an inertial filter, and the secondary filter is a filtration filter. By using an inertial filter to capture large paint mist particles and a filtration filter to capture fine paint mist particles that could not be captured by the inertial filter, the paint mist capture efficiency is improved. In a preferred embodiment of the present invention, secondary filters are arranged in multiple stages, one above the other, and the opening dimensions of the upper secondary filters are smaller than the opening dimensions of the lower secondary filters. After passing through the primary filter and having large-diameter paint mist removed, the paint exhaust rises through the exhaust passage and flows into the secondary filter. Among the minute-diameter paint mist particles contained in the exhaust, the relatively small-diameter paint mist particles rise higher than the relatively large-diameter paint mist particles. Therefore, it is rational to arrange the secondary filters in multiple stages, with the opening dimensions of the upper secondary filters set to be smaller than those of the lower secondary filters, so that the lower secondary filters capture the relatively large-diameter paint mist particles and the upper secondary filters capture the relatively small-diameter paint mist particles. In a preferred embodiment of the present invention, the primary filter is made of paper. The recovered primary filters can be incinerated and disposed of along with the paint mist. In a preferred embodiment of the present invention, the inlet and outlet of the primary filter are directed horizontally. If the inlet and outlet of the primary filter are oriented vertically, the inflow velocity will differ between the part of the filter inlet close to the exhaust port and the part further away from the exhaust port. This will result in different amounts of paint mist being collected near the exhaust port and further away from the exhaust port, causing the filter to partially clog and reducing the paint mist collection efficiency. If the inlet and outlet of the primary filter are oriented horizontally, the distance between the filter inlet and exhaust port is constant, resulting in a uniform flow velocity distribution of the dry paint booth exhaust flowing into the filter. This prevents clogging of the primary filter and maintains good paint mist collection efficiency.

[0006] The present invention provides a dry painting booth characterized in that an exhaust port is formed in the side wall of the dry painting booth, an exhaust passage communicating with the exhaust port is provided on the outside of the side wall of the dry painting booth and adjacent to the side wall of the dry painting booth, and a paint mist collection filter is provided in the exhaust passage adjacent to the exhaust port, a primary filter is provided adjacent to the exhaust port, a secondary filter is provided in the exhaust passage and above the primary filter, the primary filter is an inertial filter, the secondary filter filtration is a filter, the secondary filters are arranged in multiple stages vertically, the opening dimensions of the upper secondary filters are smaller than the opening dimensions of the lower secondary filters, and filter replacement work is performed inside the dry painting booth. Filter replacement can be performed inside the dry paint booth. Even if paint mist adhering to the filter inlet is stirred up during filter replacement, it will not leak into the outside environment. The stirred-up paint mist can be removed by the new filter after replacement. A trolley walkway is unnecessary, and the exhaust passage can be made smaller. In a preferred embodiment of the present invention, the side wall of the dry painting booth is the side wall of the painting room. In a preferred embodiment of the present invention, the side wall of the dry painting booth is the side wall of the exhaust chamber. In a preferred embodiment of the present invention, the primary filter is made of paper. In a preferred embodiment of the present invention, the inlet and outlet of the primary filter are directed horizontally. [Brief explanation of the drawing]

[0007] [Figure 1] This is a structural diagram of a dry coating booth according to an embodiment of the present invention. (a) is a vertical cross-sectional view, (b) is a view of (a) from the direction of arrow bb, and (c) is a view of (a) from the direction of arrow cc. [Modes for carrying out the invention]

[0008] A dry coating booth according to an embodiment of the present invention will be described. As shown in Figure 1, a dry-type paint booth has multiple exhaust ports 3 formed in two upper and lower tiers at the bottom of the side wall 2, which are horizontally aligned across the entire width of the side wall 2. An exhaust passage 4 is provided on the outside of the side wall 2, adjacent to the side wall 2, and overlapping the side wall 2. The exhaust passage 4 is divided into a lower space 4a and an upper space 4b by a horizontal partition wall 5 adjacent to the side wall 2 and a grating 6 that extends flush with the horizontal partition wall 5, away from the side wall 2. A frame 7 for mounting a primary filter is provided below the horizontal partition wall 5 in the lower space 4a. A frame 8 for attaching a secondary filter is positioned on the boundary line between the horizontal partition wall 5 and the grating 6 in the upper space 4b. Within the space 4a below the exhaust passage 4, and within the space between the frame 7 and the side wall 2, a primary filter 9 for collecting paint mist is arranged in two stages, upper and lower, adjacent to the exhaust port 3, and is detachably secured to the frame 7. The primary filter 9 is constructed as an inertial filter made of cardboard or similar material. The inlet and outlet of the primary filter 9 are directed horizontally, with the inlet directed towards the side wall 2 and the outlet directed away from the side wall 2. Multiple secondary filters 10 are arranged in three upper and lower tiers, horizontally aligned across the entire width of the upper space 4b, within the space between the frame 8 and the side wall 2, and are detachably secured to the frame 8. The secondary filters 10 are configured as filtration filters. The inlet and outlet of the secondary filters 10 are directed horizontally, with the inlet directed away from the side wall 2 and the outlet directed towards the side wall 2. The opening dimensions of the uppermost secondary filter 10 are set to be smaller than the opening dimensions of the two lower secondary filters 10. A trolley passage 11 is provided on the side of the frame 7 that is separated from the side wall 2, for the trolley W carrying the primary filter 9 to pass through. A secondary filter replacement work passage 12 is provided on the side of the frame 8 that is separated from the side wall 2, and directly above the trolley passage 11. An exhaust fan 13 is mounted on the ceiling wall of the upper space 4b above the secondary filter 10.

[0009] Describe the operation of the painting chamber 1. Inside the painting chamber 1, paint is sprayed from a spray gun (not shown) towards a workpiece (not shown), and the workpiece is painted. The paint spraying is performed towards the side wall 2 and obliquely downward. The exhaust fan 13 operates, and the painting exhaust gas in the painting chamber 1 flows into the trolley passage 11 through the exhaust port 3 and the primary filter 9. When the painting exhaust gas passes through the primary filter 9, the large-diameter paint mist in the painting exhaust gas collides with the baffle plate forming the primary filter 9, adheres to the baffle plate 9, and is removed from the painting exhaust gas. The painting exhaust gas flowing into the trolley passage 11 changes its direction upward as shown by the arrow in Fig. 1(a), flows into the secondary filter replacement work passage 12 through the grating 6, changes its direction towards the side wall 2 of the painting chamber, and then changes its direction upward through the secondary filter 10. When the painting exhaust gas passes through the secondary filter 10, the fine-diameter paint mist in the painting exhaust gas is filtered by the filter forming the secondary filter 10 and removed from the painting exhaust gas. Among the fine-diameter paint mist contained in the exhaust gas, the relatively small-diameter paint mist rises relatively higher than the relatively large-diameter paint mist. The secondary filter 10 is arranged in three upper and lower stages, and the opening dimension of the uppermost secondary filter 10 is set smaller than the opening dimensions of the lower two secondary filters 10. Therefore, the relatively large-diameter paint mist is collected by the lower two secondary filters 10, and the relatively small-diameter paint mist is collected by the uppermost secondary filter 10. The painting exhaust gas from which the paint mist has been removed is discharged to the external environment through the exhaust fan 13. The replacement of the primary filter 9 is carried out by an operator entering the trolley passage 11, releasing the locking of the used primary filter 9 with the frame body 7, pulling it out to the trolley passage 11, inserting the unused primary filter 9 into the frame body 7, and locking it. The replacement of the secondary filter 10 is carried out by an operator entering the secondary filter replacement work passage 12, releasing the locking of the used secondary filter 10 with the frame body 8, pulling it out to the secondary filter replacement work passage 12, inserting the unused secondary filter 10 into the frame body 8, and locking it.

[0010] In the dry-type paint booth according to this embodiment, there is a trolley passage 11 and a secondary filter replacement work passage 12 within the exhaust passage 4, so that an operator can enter the exhaust passage 4 and perform the replacement work of the primary filter 9 and secondary filter 10 within the exhaust passage 4. Even if paint mist attached to the filter inlet is stirred up during filter replacement, it will not leak into the external environment. After removing the stirred-up paint mist using a suction device installed or portable within the exhaust passage 4, or after waiting for the stirred-up paint mist to fall to the floor of the trolley passage 11, or after waiting for the stirred-up paint mist to fall to the floor of the secondary filter replacement work passage 12, the trolley W carrying the filter 9 is removed from the exhaust passage 4, and the filter 10 is removed from the exhaust passage 4, thereby preventing contamination of the external environment. A primary filter 9 is installed in the exhaust passage 4, and a secondary filter 10 is installed in the exhaust passage 4 and above the primary filter 9. A trolley passage 11 for the trolley W carrying the primary filter 9 to pass through and a secondary filter replacement work passage 12 are also installed in the exhaust passage 4. This makes it possible to replace the primary filter 9 and the secondary filter 10 separately, improving maintainability. By capturing large paint mist particles with the primary filter 9, which is an inertial filter, and then capturing fine paint mist particles that could not be captured by the primary filter 9 with the secondary filter 10, which is a filtration filter, the paint mist capture efficiency is improved. The paint exhaust, having passed through the primary filter 9 and having large-diameter paint mist removed, rises through the exhaust passage 4 and flows into the secondary filter 10. Among the minute-diameter paint mist contained in the exhaust, the relatively small-diameter paint mist rises higher than the relatively large-diameter paint mist. The secondary filter 10 is arranged in three stages, and the opening size of the uppermost secondary filter 10 is set to be smaller than the opening size of the two lower secondary filters 10. This allows the two lower secondary filters 10 to capture relatively large-diameter paint mist and the uppermost secondary filter 10 to capture relatively small-diameter paint mist, thereby effectively capturing minute-diameter paint mist. Since the primary filter 9 is made of paper, the collected primary filter 9 can be incinerated and disposed of along with the paint mist. If the inlet and outlet of the primary filter 9 are arranged vertically, the inflow velocity will be different between the part close to the exhaust port 3 of the filter inlet and the part separated from the exhaust port 3. As a result, the amount of paint mist collected at the part close to the exhaust port 3 of the primary filter 9 and the amount of paint mist collected at the part separated from the exhaust port 3 will be different, and the primary filter 9 will be partially clogged, reducing the paint mist collection efficiency. If the inlet and outlet of the primary filter 9 are arranged horizontally, since the distance between the filter inlet and the exhaust port 3 is constant, the flow velocity distribution of the exhaust air from the dry painting booth flowing into the primary filter 9 will be uniform, preventing clogging of the primary filter 9 and maintaining good paint mist collection efficiency.

[0011] The present invention is not limited to the above embodiments. When the height of the side wall 2 of the dry painting booth is small and the secondary filter 10 can be replaced from the carriage passage 11, the grating 6 may be removed and the passage 12 for secondary filter replacement work may be abolished. In the above embodiment, the carriage passage 11 for the carriage W carrying the primary filter 9 in the exhaust passage 4 and the passage 12 for secondary filter replacement work are provided, and the filter replacement work is performed in the exhaust passage 4. However, the filter replacement work may be configured to be performed in the painting chamber 1 of the dry painting booth. Since the carriage passage 11 and the passage 12 for secondary filter replacement work in the exhaust passage 4 are no longer needed, the exhaust passage 4 can be downsized. On the other hand, the efficiency of the filter removal work may be reduced due to the presence of the work conveyor disposed in the painting chamber 1. When performing the filter replacement work in the painting chamber 1, in order to facilitate the replacement work of the primary filter 9, it is desirable that the primary filter 9 is locked to the side wall 2 instead of the frame body 7. Further, in order to enable the replacement of the secondary filter 10, an opening for removing the secondary filter and a door for opening and closing the opening are provided on the side wall 2. In order to facilitate the replacement work of the secondary filter 10, it is desirable that the locking between the secondary filter 10 and the frame body 8 can be released through the opening. In the above embodiment, the exhaust passage 4 is provided on the side wall 2 of the painting chamber 1 of the dry painting booth. However, in a dry painting booth provided with an exhaust chamber below the painting chamber 1, the exhaust passage 4 may be provided on the side wall of the exhaust chamber.

Industrial Applicability

[0012] This invention is widely applicable to dry-type paint booths. [Explanation of Symbols]

[0013] 1. Painting room of a dry paint booth 2 side wall 3 Exhaust vents 4 Exhaust passage 4a Lower space 4b Upper space 5 Partition wall 6. Grating 7, 8 Support frame 9. Primary filter 10 Secondary Filters 11 Trolley aisle 12 Passageway for secondary filter replacement work 13 Exhaust fan W Trolley

Claims

1. A dry paint booth characterized in that an exhaust port is formed in the side wall of the dry paint booth, an exhaust passage communicating with the exhaust port is provided on the outside of the side wall of the dry paint booth and adjacent to the side wall of the dry paint booth, and a paint mist collection filter is provided in the exhaust passage in contact with the exhaust port, and a trolley passage for a trolley carrying the filter is provided in the exhaust passage, and the filter replacement work is performed in the trolley passage.

2. The dry painting booth according to claim 1, characterized in that the side wall of the dry painting booth is the side wall of the painting room.

3. The dry painting booth according to claim 1, characterized in that the side wall of the dry painting booth is the side wall of the exhaust chamber.

4. A dry paint booth according to claim 1, characterized in that a primary filter is provided adjacent to the exhaust port, a secondary filter is provided in the exhaust passage and above the primary filter, and a trolley passage for a trolley carrying the primary filter is provided in the exhaust passage.

5. The dry paint booth according to claim 4, characterized in that, in addition to the trolley passage, a passage for secondary filter replacement work is provided within the exhaust passage and above the trolley passage.

6. The dry painting booth according to claim 4, characterized in that the primary filter is an inertial filter and the secondary filter is a filtration filter.

7. The dry painting booth according to claim 6, characterized in that secondary filters are arranged in multiple upper and lower stages, and the opening dimensions of the upper secondary filters are smaller than the opening dimensions of the lower secondary filters.

8. A dry painting booth according to any one of claims 4 to 7, characterized in that the primary filter is made of paper.

9. A dry paint booth according to any one of claims 4 to 7, characterized in that the inlet and outlet of the primary filter are directed horizontally.

10. A dry paint booth characterized in that an exhaust port is formed in the side wall of the dry paint booth, an exhaust passage communicating with the exhaust port is provided on the outside of the side wall of the dry paint booth and adjacent to the side wall of the dry paint booth, and a paint mist collection filter is provided in the exhaust passage adjacent to the exhaust port, a primary filter is provided adjacent to the exhaust port, a secondary filter is provided in the exhaust passage and above the primary filter, the primary filter is an inertial filter, the secondary filter filtration is a filter, the secondary filters are provided in multiple stages vertically, the opening dimensions of the upper secondary filters are smaller than the opening dimensions of the lower secondary filters, and filter replacement work is performed inside the dry paint booth.

11. The dry painting booth according to claim 10, characterized in that the side wall of the dry painting booth is the side wall of the painting room.

12. The dry painting booth according to claim 10, characterized in that the side wall of the dry painting booth is the side wall of the exhaust chamber.

13. A dry painting booth according to any one of claims 10 to 12, characterized in that the primary filter is made of paper.

14. A dry paint booth according to any one of claims 10 to 12, characterized in that the inlet and outlet of the primary filter are directed horizontally.

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