CN110721863B

CN110721863B - Dry-type spray room

Info

Publication number: CN110721863B
Application number: CN201910975379.0A
Authority: CN
Inventors: 秦炜
Original assignee: Kunshan Deruitai Automatic Equipment Co ltd
Current assignee: Kunshan Deruitai Automatic Equipment Co ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2020-12-29
Anticipated expiration: 2039-10-14
Also published as: CN110721863A

Abstract

The invention discloses a dry type spray booth which comprises a spray booth, an air return system and a paint blocking unit arranged between the spray booth and the air return system. The air return system comprises a first filtering device, a second filtering device and a third filtering device, wherein the first filtering device is used for receiving the waste air in the paint spraying chamber so as to filter large-particle paint mist in the waste air; the granulating device is communicated with the output end of the first filtering device and is used for receiving the waste gas filtered by the first filtering device and granulating the small-particle paint mist in the waste gas; the second filtering device is communicated with the output end of the granulating device and is used for separating the granulated paint mist from the waste gas; and the input end of the third filtering device is communicated with the second filtering device, and the output end of the third filtering device is communicated with the spray booth. The scheme adopted by the invention has the advantages of reducing the waste gas discharge of the spray room, reducing the running cost and the maintenance cost of the spray room system and the like.

Description

Dry-type spray room

Technical Field

The invention relates to the technical field of coating processes, in particular to a dry type spray room.

Background

The coating process is a widely used construction process and is widely applied to the industries of machinery, electronic equipment, automobiles, ships, household appliances, furniture and the like. Whereas spray booths for spray painting are common equipment in paint shops. During the painting process, the paint is atomized into particles under the action of high pressure, wherein part of the film-forming substances are attached to the surface of the object to be painted, and part of the film-forming substances are dissipated to the air and the ground along with the air flow to form paint mist particles taking the film-forming substances as the main components. Meanwhile, the thinner in the paint is not attached to the surface of the painted object along with the film-forming substance, but is released in the process of painting and curing to form painting waste gas, and the waste gas contains a large amount of paint mist.

Along with the improvement of the environmental awareness of people, the environmental protection department has certain requirements on the emission quality of enterprises, so that the paint mist and the paint spraying waste gas generated in the paint spraying process can be discharged after being treated. The traditional spray room has two main paint mist treatment modes, one mode is water spraying or waterfall filtering (wet type), the filtering effect is poor, the generated waste gas amount is large, the water resource consumption is large, and the discharged waste water can cause secondary pollution; the other is a filter forced filtration (dry type) mode, which consumes a large amount of filter materials and increases the production cost of enterprises.

Disclosure of Invention

In order to overcome the defects in the prior art, embodiments of the present invention provide a dry spray booth, which is used to solve the above problems.

The embodiment of the application discloses: a dry spray booth that produces exhaust having large particle paint mist and small particle paint mist in the exhaust, comprising: paint spray booth, return air system and setting are in the paint spray booth with keep off the lacquer unit between the return air system, wherein, keep off and be equipped with the confession on the lacquer unit the paint spray booth with the window of return air system intercommunication, the return air system includes:

the first filtering device is used for receiving the exhaust gas in the paint spraying chamber so as to filter large-particle paint mist in the exhaust gas;

the granulating device is communicated with the output end of the first filtering device and is used for receiving the waste gas filtered by the first filtering device and granulating the small-particle paint mist in the waste gas;

the second filtering device is communicated with the output end of the granulating device and is used for separating the granulated paint mist from the waste gas;

and the input end of the third filtering device is communicated with the second filtering device, and the output end of the third filtering device is communicated with the spray booth.

Specifically, the dry-type spray booth further comprises an air chamber, the output end of the air chamber is communicated with the spray booth, and the input end of the air chamber is communicated with the return air system.

Specifically, the air chamber comprises a first chamber body and a second chamber body which are relatively independent, the first chamber body is used for conveying fresh air to the inside of the paint spraying chamber, and the second chamber body is used for being communicated with the return air system to convey return air to the inside of the paint spraying chamber.

Specifically, the spray booth includes the work piece passageway and is used for supplying personnel to stand or place the accommodation area of automatic spray gun, the work piece passageway is located and is close to one side of keeping off the lacquer unit and being located the below of the second room body, the accommodation area is located keeps away from one side of keeping off the lacquer unit and being located the below of the first room body.

Specifically, the third filter device is disposed in the second chamber.

Specifically, the first filtering device comprises a channel for allowing waste gas to pass through, the input end of the channel is communicated with the spray booth, and the output end of the channel is communicated with the granulating device.

In particular, the cross-sectional area of the channel increases in a direction from the inlet to the outlet of the channel.

Specifically, the flow velocity of the exhaust gas in the passage decreases in a direction from the inlet to the outlet of the passage.

Specifically, the granulation device comprises a venturi tube.

Specifically, the second filtering device comprises a separation tower and a collecting box, wherein the separation tower is communicated with the granulating device and the spray booth respectively, and the collecting box is arranged below the separation tower.

The invention has at least the following beneficial effects:

1. because this dry-type spray booth does not rely on water to carry out the coating cloud and handles, consequently, need not to carry out waste water treatment, and the gas after this air return system who spouts the room filters can directly drop into the air chamber and utilize.

2. The waste gas of the dry type spray room can be recycled after being recycled, and the waste gas discharge capacity can be reduced to 50% or below of that of the traditional water curtain type dry type spray room, so that the burden of a waste gas treatment system at the rear section can be reduced, and the cost of waste gas treatment is further reduced; in addition, the recycled gas can be input into the paint spraying chamber, so that the fresh air quantity required for maintaining the air pressure in the paint spraying chamber can be reduced, and the running cost of the dry type spray chamber is further reduced.

3. Because when the air return system, a large amount of paint mist in the waste gas has been got rid of by first filter equipment, the second filter equipment in the air return system, consequently, when this dry-type spray booth exhaust waste gas got into the paint removal system of back end, the waste gas brought the paint mist in the paint removal system very little, can alleviate the burden of equipment among the paint removal system, the maintenance cycle of extension equipment, reduction maintenance frequency.

4. The dry-type spray room can filter most of paint mist in the waste gas by adopting a mode of combining the first filtering device, the granulating device and the second filtering device, so that the cleanliness and the recyclability of the waste gas are improved; in addition, the mode that the first filter equipment that adopts the passageway that is used for subsiding large granule coating cloud, the prilling granulator that has venturi and the second filter equipment that has the knockout tower combine improves its structural arrangement's rationality when guaranteeing return air system's filter effect, can practice thrift return air system's volume, and then saves its installation space.

5. Compared with the filter screen type filtering mode containing filter materials in the prior art, aiming at the characteristics of the particles such as paint mist and the like, the first filtering device and the second filtering device of the spray room can settle the particles through wind power so as to achieve the effect of filtering the particles, and therefore, consumable materials such as the filter materials can be greatly saved.

6. The spray booth can be used for spraying water-based paint and also can be used for spraying oil-based paint.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural view of a dry spray booth according to an embodiment of the present invention;

FIG. 2 is a front view of a dry spray booth as described in an embodiment of the present invention;

FIG. 3 is a schematic view showing the internal structure of the spray booth according to the embodiment of the present invention;

fig. 4 is a schematic structural view of the channel in the embodiment of the present invention.

Reference numerals of the above figures: 1-a spray booth, 11-a workpiece channel, 12-a holding area, 13-a paint blocking unit, 14-a tray, 2-an air chamber, 21-a first chamber body, 22-a second chamber body, 3-a first filtering device, 31-a channel, 311-an inlet, 312-an outlet, 4-a granulating device, 5-a second filtering device, 51-a separating tower, 52-a collecting box, 6-a fan, 7-filter cotton, 8-a third filtering device and 9-an exhaust pipeline.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, the spray booth in the present embodiment includes a paint spray booth 1, an air chamber 2 in communication with the paint spray booth 1, an air return system in communication with the paint spray booth 1, and a paint blocking unit 13 disposed between the paint spray booth 1 and the air return system, where the paint blocking unit 13 is provided with a window for communicating the paint spray booth 1 and the air return system. The air chamber 2 is used for introducing air into the paint spraying chamber 1 to ensure that the air pressure in the paint spraying chamber 1 meets working conditions, and in general, in order to avoid foreign matters such as external dust and the like from attaching to the surface of a workpiece, the air pressure in the paint spraying chamber 1 is slightly larger than the external air pressure. The air return system is used for collecting waste gas in the spray booth 1 and treating the waste gas, so that the waste gas can be recycled, and the effect of emission reduction is achieved. Under the effect of the paint blocking unit 13, during spraying, up to 80% of the paint overflowing mist (no paint attached to the surface of the workpiece, commonly called paint overflowing mist) can be deposited on the paint blocking unit 13, and the rest paint overflowing mist can enter the air return system from the window on the paint blocking unit 13 along with the waste gas, so that the work load of the air return system can be reduced. Specifically, the exhaust air from the painting booth 1 has large-particle paint mist and small-particle paint mist, and the air return system is intended to filter out the paint mist of different particle sizes in the exhaust air as much as possible, so that the cleanliness of the exhaust air can meet the requirements of the painting booth 1. In the present embodiment, the large particle mist and the small particle mist are of a filtering grade which can be achieved by the first filtering means and/or the second filtering means, and for example, the mist having a particle size of more than 5 μm may be referred to as a large particle mist, and the mist having a particle size of 5 μm or less may be referred to as a small particle mist.

Referring to fig. 2, the paint barrier unit 13 may have a simple baffle structure, a large amount of the overflowing paint mist is blocked by the baffle, and a small amount of the overflowing paint mist enters the return air system. By adopting the structure, the paint blocking unit 13 in the embodiment has a simple structure and is convenient to clean and maintain. Of course, the paint barrier unit 13 may be provided in other configurations depending on the configuration of the painting booth 1 and the return air system.

With continued reference to fig. 1 and 2, the return air system includes: a first filter device 3, a granulating device 4 and a second filter device 5. The first filter device 3 may be connected to the bottom of the painting booth 1 for receiving the exhaust air from the painting booth 1 so that the large particle paint mist from the exhaust air absorbed in the painting booth 1 is filtered out, that is, the first filter device 3 can perform a preliminary treatment on the exhaust air so that the exhaust air discharged from the first filter device 3 contains almost no large particle paint mist. The granulating device 4 is communicated with the output end of the first filtering device 3 and is used for receiving the waste gas filtered by the first filtering device 3. The waste gas after the first paint mist filtering is discharged from the first filtering device 3 and then enters the granulating device 4, and the granulating device 4 is used for granulating the residual small-particle paint mist in the waste gas to form large-particle paint mist. The second filtering device 5 is communicated with an output end of the granulating device 4, the second filtering device 5 is used for separating the granulated paint mist from the exhaust gas, an output end of the second filtering device 5 is communicated with the paint spraying chamber 1 so as to convey the purified exhaust gas (in the embodiment, the purification mainly means filtering out particle impurities with a certain particle size, such as the paint mist in the exhaust gas) into the paint spraying chamber 1, and the exhaust gas conveyed into the paint spraying chamber 1 can also be called return air. The air return system can further comprise a fan 6, the input end of the fan 6 is communicated with the output end of the second filtering device 5, the output end of the fan 6 is communicated with the paint spraying chamber 1, and the fan 6 can provide power for the whole air return system.

By means of the structure, compared with the prior art, the dry type spray room in the embodiment has the following advantages:

1. because the dry spray booth does not depend on water for paint mist treatment, wastewater treatment is not needed.

2. The waste gas of the dry type spray room can be recycled after being recycled, and the waste gas discharge capacity can be reduced to 50% or below of that of the traditional water curtain type dry type spray room, so that the burden of a waste gas treatment system at the rear section can be reduced, and the cost of waste gas treatment is further reduced; in addition, since the amount of fresh air required to maintain the air pressure in the painting booth 1 can be reduced after the recycled air is introduced into the painting booth 1, the running cost of the dry type painting booth can be further reduced.

3. Because when passing through the air return system, a large amount of paint mist in the waste gas is removed by the first filtering device 3 and the second filtering device 5 in the air return system, therefore, when the waste gas discharged by the dry type spray room enters the paint removing system at the rear section, the paint mist brought into the paint removing system by the waste gas is less, the burden of equipment in the paint removing system can be lightened, the maintenance period of the equipment is prolonged, and the maintenance frequency is reduced.

4. The dry-type spray booth can filter most paint mist in the waste gas by adopting a mode of combining the first filtering device 3, the granulating device 4 and the second filtering device 5, so that the cleanliness and the recyclability of the waste gas are improved; in addition, the mode that the first filtering device 3 with the channel 31 for settling the large-particle paint mist, the granulating device 4 with the Venturi tube and the second filtering device 5 with the separating tower 51 are combined is adopted, the filtering effect of the air return system is ensured, meanwhile, the reasonability of the structural arrangement of the air return system is improved, the volume of the air return system can be saved, and the installation space of the air return system is further saved.

Specifically, as shown in fig. 2 and 3, the painting booth 1 in the present embodiment may have a substantially rectangular parallelepiped structure. The paint spray booth 1 includes a workpiece passage 11 for placing a workpiece, and a receiving area 12 for a person to stand or place an automatic spray gun, the workpiece passage 11 is disposed at a side close to the paint stop unit 13, and the receiving area 12 is disposed at a side far from the paint stop unit 13. That is, the spray booth in this embodiment may be either a manual spray booth or an automatic spray booth, and when the personnel or the automatic spray booth is located in the accommodating area 12 and facing the workpiece passage 11 to spray the workpiece, most of the paint mist overflowing may be directly blocked by the paint blocking unit 13. The workpiece channel 11 can run through both sides of the spray booth 1 in the feed direction. A conveying chain (not shown in the figure) for conveying the workpiece can be arranged in the workpiece channel 11, the workpiece can directly penetrate into the paint spraying chamber 1 from one side under the action of the conveying chain, and the workpiece can penetrate out of the paint spraying chamber 1 from the other side to the next process after the workpiece is painted. The bottom of the workpiece channel 11 is provided with a tray 14 for receiving the overflowing paint mist. Of course, the structure of the painting booth 1 may also take other shapes. Under the action of the paint barrier unit 13, up to 80% of the paint overspray (paint not adhering to the surface of the workpiece, commonly referred to as overspray) can settle on the pallet 14 during spraying. The remaining paint overspray can pass into the return air system with the exhaust air. The tray 14 may be made of metal or plastic, such as stainless steel or PP.

Further, as shown in fig. 1, the air chamber 2 is disposed substantially above the painting booth 1, and the bottom of the air chamber 2 may communicate with the painting booth 1 through a filter pad 7 to ensure that impurities in the air entering the painting booth 1 from inside the air chamber 2 are filtered out, and in addition, the filter pad 7 allows the air inside the air chamber 2 to uniformly descend into the painting booth 1. Preferably, the gas chamber 2 can be divided into a first chamber body 21 and a second chamber body 22 which are relatively independent. Wherein, the first room body 21 is arranged above the accommodating area 12, an air conditioning bellows (not shown in the figure) for introducing fresh air into the painting room 1 can be arranged in the first room body 21, and the second room body 22 can be arranged above the workpiece channel 11 and is used for being connected with a return air system, specifically, the output end of the fan 6 can extend into the second room body 22, so that the purified waste gas coming out from the return air system passes through the second room body 22 and then enters the painting room 1.

With the above-described arrangement, the air chamber 2 is divided into the first chamber body 21 and the second chamber body 22 which are relatively independent, and the first chamber body 21 is disposed above the accommodation region 12, and the second chamber body 22 is disposed above the workpiece passage 11. Therefore, fresh air in the first room body 21 can be input into the paint spraying room 1 from the position right above the accommodating area 12, return air in the second room body 22 can be input into the paint spraying room 1 from the position right above the workpiece channel 11, and when a person stands in the accommodating area 12 to work, the influence of the return air on the person can be avoided to a great extent.

In particular, as shown in fig. 4, the first filtering means 3 comprise a passage 31 for the passage of the exhaust gases, the input of this passage 31 communicating with the spray booth 1 and the output of the passage 31 communicating with the granulation means 4. Preferably, after the exhaust gas enters the channel 31, the flow rate of the exhaust gas can be changed, so as to improve the filtering effect of the channel 31 on the paint mist in the exhaust gas. More specifically, the cross-sectional area of the channel 31 increases from the inlet 311 to the outlet 312 of the channel 31, so that the flow speed of the exhaust gas can suddenly decrease after the exhaust gas enters the channel 31 in the first filter device 3, and the flow speed of the exhaust gas can be reduced along the direction from the inlet 311 to the outlet 312 of the channel 31, so that the residence time of the exhaust gas in the channel 31 can be prolonged, the large-particle paint mist in the exhaust gas can be favorably settled on the inner wall of the channel 31 and then flows to the bottom, and the filtering of the large-particle paint mist by the channel 31 is realized. Further, the channel 31 can be in a surrounding shape, or the channel 31 can be in a volute shape, so that the arrangement space of the channel 31 can be saved, the movement track of the waste gas in the channel 31 can be prolonged, the retention time of the waste gas in the channel 31 can be further prolonged, and the large-particle paint mist can be more favorably settled in the channel 31.

Adopt above-mentioned scheme, can realize the subsidence of large granule coating cloud in the waste gas through the velocity of flow that changes the waste gas in the first filter equipment 3 in this embodiment rather than through being provided with the filter media to the realization is filtered large granule coating cloud from the waste gas. Therefore, the first filtering device 3 in this embodiment can save consumables such as filtering material.

Specifically, as shown in fig. 1, the granulating device 4 includes a venturi tube. In other words, the granulating device 4 can utilize the principle of a venturi flowmeter to extrude the small paint mist in the exhaust gas passing through it rapidly into a larger paint mist, so that the small paint mist in the exhaust gas is condensed to exist in a larger particle state, so that the paint mist is filtered in the subsequent second filtering device 5. Preferably, in order to increase the degree of squeezing of the small particle paint mist in the exhaust gas in the venturi, the wind speed at the inlet of the venturi may be greater than the wind speed at the outlet 312 of the passage 31 of the first filter device 3, but the wind speed in the venturi is prevented from being so great as to suck the large particle paint mist settled on the inner wall of the passage 31 into the venturi.

Specifically, as shown in fig. 1, the second filtering device 5 comprises a separation tower 51 communicating with the granulation device 4 and the spray booth 1, respectively, and a collection tank 52 disposed below the separation tower 51. When the granulated exhaust gas passes through the second filtering device 5, the large-particle paint mist in the exhaust gas is easy to be subjected to centrifugal force in the separating tower 51 and is settled in the collecting box 52 below the separating tower 51, so that the exhaust gas and the paint mist are separated again. At this time, the exhaust gas after the secondary separation contains substantially no paint mist particles. Adopt above-mentioned scheme, second filter equipment 5 in this embodiment can realize the subsidence of large granule coating cloud in the waste gas after the granulation through wind-force rather than through being provided with the filter media to the realization is filtered large granule coating cloud from waste gas. Therefore, consumables such as filter materials can be further saved.

Specifically, as shown in fig. 1, the fan 6 is further provided with an exhaust duct 9 for discharging a part of the waste gas after the secondary treatment into a paint removal system at the rear stage. Adopt above-mentioned structure, be favorable to controlling the waste gas volume that gets into in the paint spray booth 1, can avoid the waste gas concentration in the paint spray booth 1 too high and cause the influence to the personnel.

In particular, the return air system may further include a third filter device 8. Preferably, the third filtering device 8 comprises a filtering bag with filtering efficiency at least reaching F5 (the collecting efficiency of the dust particles and suspended matters with the particle size between 1 and 5 μm is between 40 and 50%), the third filtering device 8 can be arranged in the second chamber body 22, and the third filtering device 8 is arranged above the filtering cotton 7. The third filter device 8 is used for further filtering the exhaust gas output by the fan 6 to ensure that the exhaust gas entering the paint spray booth 1 is further purified. The third filter means 8 may also comprise a differential pressure gauge (not shown) which can be used to monitor the filter bag replacement, in particular, the filter bag can divide the second chamber 22 into two spaces, one for receiving the exhaust air from the return air system and the other for receiving the exhaust air filtered by the filter bag, and when the differential pressure between the two spaces increases to a certain value, the filter bag needs to be replaced to ensure the quality and efficiency of the exhaust air entering the spray booth 1.

The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. A dry spray booth that produces exhaust having large particle paint mist and small particle paint mist, comprising: paint spray booth, return air system and setting are in the paint spray booth with keep off the lacquer unit between the return air system, wherein, keep off and be equipped with the confession on the lacquer unit the paint spray booth with the window of return air system intercommunication, the return air system includes:

the first filtering device is used for receiving the exhaust gas in the paint spraying chamber to filter large-particle paint mist in the exhaust gas, the first filtering device comprises a channel for the exhaust gas to pass through, the input end of the channel is communicated with the paint spraying chamber, and the flow speed of the exhaust gas in the channel is reduced from the inlet to the outlet of the channel;

the granulating device is communicated with the output end of the first filtering device and is used for receiving the waste gas filtered by the first filtering device and granulating the small-particle paint mist in the waste gas, the granulating device comprises a Venturi tube, the inlet of the Venturi tube is communicated with the output end of a channel of the first filtering device, and the air speed at the inlet of the Venturi tube is higher than that at the outlet of the channel of the first filtering device;

2. A dry spray booth as claimed in claim 1, further comprising an air plenum, an output of said air plenum being in communication with said spray booth and an input of said air plenum being in communication with said return air system.

3. A dry spray booth as claimed in claim 2, wherein said plenum comprises first and second relatively independent chambers, said first chamber being configured to deliver fresh air to said booth and said second chamber being configured to communicate with said return air system to deliver return air to said booth.

4. A dry spray booth as claimed in claim 3, wherein said spray booth includes a workpiece passage located adjacent a side of said paint dam unit and below said second booth body and a receiving area for personnel to stand or place an automated spray gun, said receiving area located remote from said paint dam unit and below said first booth body.

5. A dry spray booth as claimed in claim 3, wherein said third filtration device is disposed within said second chamber body.

6. A dry spray booth as claimed in claim 1, wherein the cross-sectional area of said passages increases in a direction from the inlet to the outlet of said passages.

7. A dry spray booth as claimed in claim 1, wherein said second filtering means comprises a separation tower communicating with said granulation means and said spray booth, respectively, and a collection box disposed below said separation tower.