KR20200093192A - Apparatus for coating of filter substrate material - Google Patents

Abstract

The present invention relates to an apparatus for coating a photocatalyst on a porous support in the form of a foam or honeycomb serving as a base of a deodorant filter. According to the present invention, there is realized a new manner of coating a photocatalyst which is optimized to be appropriate to a characteristic of a porous support member through the combination of a dipping process, an air knife process, a hot air drying process, or a fan cooling process to effectively fix a photocatalyst coating liquid on the porous support member, such as a foam or a honeycomb, in which most part of the porous support member allows air to smoothly flow and generates photoactivity of the photocatalyst, thereby preparing a photocatalytic deodorization filter prepared to have a wider use range, to improve efficiency of the coating process, and to ensure coating quality, such that a lifespan is increased, and excellent performance is exhibited. The air knife process is performed in an environment in which a uniform temperature condition is constantly maintained, when uniformly dispersing a coating liquid coated on the porous support member after dipping the photocatalyst coating liquid on an inner part of the porous support member and the surface of the porous support member. In addition, the coating liquid may be uniformly dispersed on the porous support member regardless of the viscosity of the coating liquid based on a temperature variation, thereby improving the coating efficiency.

Description

Filter support coating device {APPARATUS FOR COATING OF FILTER SUBSTRATE MATERIAL}

The present invention relates to a device for coating a filter support, and more particularly, to a device for coating a photocatalyst on a porous support in the form of a foam or honeycomb serving as a substrate such as a deodorizing filter.

In general, in order to purify the air, a non-woven type filter using polypropylene (PP) resin fiber or polyethylene (PE) resin fiber is used, or an electrostatic filtration type electrostatic filter is used.

However, it is possible to filter dust with this type of filter, but its structure makes it difficult to remove odors or sterilize bacteria.

Therefore, a separate deodorization filter made of activated carbon is sometimes used for deodorization.

However, the deodorizing filter using activated carbon has poor deodorizing performance and durability, and has a problem in that it cannot sterilize harmful microorganisms contained in the air.

To solve this problem, a so-called photocatalytic technology using a photocatalytic material activated by photoenergy and having a sterilization and deodorization function is being researched and developed, and a representative photocatalyst is titanium oxide (TiO ₂ ).

In general, photocatalysts such as titanium oxide have excellent adsorption power with organic substances, and when exposed to light energy, excite to form various types of radicals, and sterilize microorganisms with strong oxidizing power, and at the same time, radicals It breaks down while reacting with bacterial substances that cause odor.

In addition, as electrons or holes react directly with organic substances to break the organic substances, eventually water vapor and carbon dioxide remain and deodorize.

After all, if a photocatalyst is used, sterilization, deodorization, and allergen decomposition can be performed using the above principle.

However, in spite of the excellent performance of the photocatalyst as described above, it is very difficult to use a filter using a photocatalyst in an air purifier or a home air conditioner, so the air purifying using the photocatalyst is extremely limited.

The reason is that in order to use a photocatalyst in an air conditioner, the photocatalyst must be coated on a substrate, that is, a frame having a predetermined shape. When coating titanium oxide, a photocatalyst, on an inorganic substrate such as a metal body or glass, the photocatalyst has a weak affinity with them, so it can be easily removed This is because, when coated on an organic substrate, the organic material is decomposed by a photocatalytic reaction.

That is, in the prior art, it was difficult to coat the photocatalyst so as not to be detached from a substrate serving as a frame of a filter, that is, a metal steel plate, a mesh, a honeycomb, or a foam.

As an example, in order to use it in an air conditioner or an air purifier in which a suction fan is installed, the photocatalyst is scattered, so it is difficult to use a filter using a photocatalyst in household appliances.

In particular, although the photocatalyst can be coated at a certain level on a support having a solid form such as a metal steel plate, there are many difficulties in coating the photocatalyst on a support having a perforated form such as honeycomb or foam.

For this reason, in spite of the excellent performance of the photocatalyst as described above, there is a limit to be used by applying the photocatalyst only in some limited fields.

Korean Patent Registration No. 10-1534187 Korean Patent Publication No. 10-2000-0009721 Korean Patent Publication No. 10-2010-0076839 Korean Patent Publication No. 10-2018-0064204 Korean Patent Publication No. 10-2017-0033833 Korean Patent Publication No. 10-2011-0100088 Korean Patent Publication No. 10-2016-0065386

Therefore, the present invention was devised in view of this point, and the flow of air is smooth and the photocatalyst coating solution is effectively fixed to a porous support such as foam, honeycomb, etc., which has a large portion of photocatalytic activity. In order to improve the efficiency of the coating process, by implementing a new photocatalytic coating method optimized for the characteristics of the porous support, in combination with a dipping process, air knife process, hot air drying process, fan cooling process, etc. It is an object of the present invention to provide a filter support coating device capable of manufacturing a photocatalyst deodorizing filter having a long life, excellent performance, and a wide range of use, such as ensuring a coating quality.

In addition, another object of the present invention, when dipping the photocatalyst coating solution on the inside and the surface of the perforated support, and uniformly dispersing the coating solution applied to the porous support, the air knife process in an environment in which uniform temperature conditions are always maintained. By providing a, it is to provide a filter support coating device capable of improving coating efficiency such as uniformly dispersing a coating solution on a porous support regardless of the viscosity of the coating solution according to temperature change.

To achieve the above object, the filter support coating device provided by the present invention has the following features.

The filter support coating device is a device for coating a coating solution on the surface and the inside of a porous filter support such as a foam form or a honeycomb form, a dipping tank filled with a coating solution, a basket for receiving a plurality of filter supports, and the basket Dipping unit consisting of an actuator that drives up and down to dip the basket into the inside of the dipping tank or pulls the basket out of the dipping tank, and the rear end of the dipping unit is continuously disposed to uniformly disperse the coating liquid applied to the filter support. , An air knife unit composed of at least one air knife for spraying air to a filter support conveyed along a conveyor device, and continuously disposed on a rear end of the air knife unit to dry the coating solution applied to the filter support As one, the hot air tunnel is installed in a structure surrounding the periphery of the conveyor device to which the filter support is conveyed, a hot air drying unit comprising a heater and a hot air fan installed inside the hot air tunnel to supply hot air, and the hot air drying unit It is arranged continuously at the rear end of the unit to cool the coating liquid dried on the filter support, and is composed of a cooling duct installed on the upper part of the conveyor device to which the filter support is transferred and a cooling fan installed on the lower part of the conveyor device. It consists of a structure including a room temperature cooling unit.

Here, the dipping unit is composed of a coating liquid recovery tank and a basket holder installed side by side on one side of the dipping tank, and a coating liquid recovery pipe connected between the dipping tank and the recovery tank to recover a portion of the coating liquid excessively applied to the filter support. And it may further include a weighting unit to reuse.

The weighting unit may include a vibration generator installed on the basket holder to apply vibration to the basket containing the filter support, so that the coating solution excessively applied to the filter support can quickly fall off.

And, the air knife of the air knife unit is composed of a first air knife and a third air knife at the top and a second air knife at the bottom based on the conveyor device, the first air knife from the front along the transport direction of the filter support , The second air knife and the third air knife may be sequentially arranged with a distance difference between each other.

The first air knife, the second air knife, and the third air knife may be installed in a structure capable of vertically adjusting height while being supported by an air knife bracket.

In particular, the air pressure discharged from the first air knife, the second air knife, and the third air knife may be adjusted to control the coating amount of the coating solution applied to the filter support.

In a preferred embodiment, the hot air drying unit further includes a hot air induction duct installed along the inner wall of the hot air tunnel to allow the hot air supplied by the hot air fan to rise up through the side and then flow downward to be supplied to the filter support. Can.

In a preferred embodiment, the filter support coating apparatus may further include a constant temperature chamber that has an air inlet unit while having a front inlet and a rear outlet, wherein the constant temperature chamber is a cartridge heater for heating and cooling air inside the chamber And a cooling coil, a temperature sensor for sensing the temperature inside the chamber, and a fan and a fan motor for circulation of air inside the chamber.

The filter support coating device provided by the present invention has the following effects.

First, a combination of a dipping process, an air knife process, a hot air drying process, and a room temperature cooling process, and the flow of air is smooth and many forms of photocatalyst photoactivities (Foam) and Honeycomb (Honeycomb) ) By adopting a new photocatalyst coating method optimized for the characteristics of porous supports having the form, etc., it is possible to improve the efficiency of the coating process as well as to secure excellent coating quality. It has the effect of producing a photocatalyst deodorizing filter.

Second, by adopting a system capable of performing a photocatalytic coating process as a continuous automated process using a dipping unit, air knife unit, hot air drying unit, or room temperature cooling unit, the coating cycle time can be shortened, and per hour There is an effect that can increase productivity, such as increasing the amount of coating that can be processed.

Third, by using the pressure of air during the air knife process, it is possible to control the amount of coating applied to the filter support, so that various types of filter support used in various fields can be manufactured in one facility, etc. It has the effect of improving the economic efficiency and efficiency.

Fourth, by dispersing the coating solution applied to the porous support, by performing an air knife process in a constant temperature chamber where a constant temperature condition is always maintained, the coating solution is uniformly applied to the porous support regardless of the viscosity of the coating solution according to the temperature change. It has the effect of improving coating efficiency such as being able to disperse as well as securing excellent coating quality.

1 and 2 are a front view and a plan view showing a filter support coating apparatus according to an embodiment of the present invention
Figure 3 is a cross-sectional view taken along line AA of Figure 2
Figure 4 is a cross-sectional view taken along line BB of Figure 2
5 is a cross-sectional view taken along line CC in FIG. 2;
6 is an enlarged view of a portion “D” of FIG. 1.
FIG. 7 is an enlarged view of a portion “E” of FIG. 1.
8 is an enlarged view of a portion “F” of FIG. 1.
9 is an enlarged view of a portion “G” in FIG. 2
FIG. 10 is an enlarged view of a portion “H” of FIG. 2.
11 and 12 are photographs showing a foam form and a honeycomb form filter support made with a filter support coating device according to an embodiment of the present invention

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 is a front view and a plan view showing a filter support coating apparatus according to an embodiment of the present invention, Figures 3 to 5 are cross-sectional views showing a filter support coating apparatus according to an embodiment of the present invention, Figure 6 10 is an enlarged view showing a filter support coating apparatus according to an embodiment of the present invention.

1 to 10, the filter support coating apparatus includes a dipping unit 13 for coating a coating solution, that is, a photocatalyst coating solution, on the filter support 100 by a dipping method.

The dipping unit 13 serves to coat the coating solution on the filter support by dipping and dipping the basket 11 containing the plurality of filter supports in the dipping tank 10 filled with the coating solution.

To this end, a dipping tank 10 filled with a certain amount of coating liquid is installed on one side of the dipping unit frame 29, and a coating liquid tank supplying a coating liquid to the dipping tank 10 on one side of the dipping tank 10 installed in this way 30 is installed in a structure supported on the dipping unit frame (29).

At this time, the coating liquid tank 30 and the dipping tank 10 are connected by a pipe so that the coating liquid can be replenished when necessary.

And, a basket 11 in the form of a square network structure for accommodating a plurality of filter supports is provided, and the basket 11 is placed on the side of the basket support 31a installed on the rod side of the actuator 12 to be described later. It can be supported.

In addition, the ball caster 32 is mounted at the front, rear, and left and right four places of the basket 11, and can be placed on the basket support 31a through the ball caster 32 at this time.

Here, the filter support accommodated inside the basket 11 can be arranged in a state of being arranged side by side while taking a standing posture.

In particular, a pair of actuators 12, such as cylinders, are provided as means for raising and lowering the basket 11 containing the filter support, and each actuator 12 has both sides of the dipping tank 10 It is installed in a structure supported on the wall surface of the dipping tank 10 while being disposed in a vertical posture.

For example, a cylinder block 33 having bushes on both sides is installed on both wall surfaces of the dipping tank 10, and the upper end of the body of each actuator 12 is fastened to the cylinder block 33 thus installed. Is installed as

The rod of each of the actuators 12 is provided with a bar-shaped basket support 31a, respectively, in a horizontal posture, and the ball casters 32 located at the upper end of the basket 11 are installed on both sides of the basket support 31a. Can be placed.

Then, two side-by-side guide bars 34 are disposed on both sides of the actuator 12, and the guide bars 34 are coupled through a bushing of the cylinder block 33 in a slidable structure, and through a basket through the top. It is installed in a structure coupled to the bottom surface of the support (31a).

Accordingly, when the actuator 12 is operated, the entire basket support 31a including the basket 11 can be raised and lowered while being guided by the guide bar 34, and the basket 11 in the lowered position The filter support in) can be coated while dipping in the coating liquid filled in the dipping tank 10.

In addition, the filter support coating device includes a weighting unit 26 as a means for removing a portion of the coating solution that is excessively applied to the filter support.

The weighting unit 26 is arranged side by side on one side of the dipping unit 13, that is, in a filter support in the basket 11 moved from the dipping unit 13 side while being continuously disposed at the rear end of the dipping unit 13 It serves to collect the dripping coating solution.

To this end, a coating liquid recovery tank 24 having a structure supported on a dipping unit frame 29 is installed side by side on one side of the dipping tank 10, that is, a rear end, and the coating liquid recovery tank 24 installed in this way A pair of basket holders 25, which are formed of two rows of post structures and supported on the dipping unit frame 29, are vertically installed at both side portions of the side.

In addition, a basket-shaped basket support 31b is installed in each basket holder 25 in a horizontal posture, and a basket 11 is installed on both sides of the basket support 31b using a ball caster 32. Can be placed.

Here, the height and the left and right width intervals of the pair of basket supports 31b installed on the basket holder 25 are of the pair of basket supports 31a installed on the rod of the actuator 12 of the dipping unit 13. The height and the left and right width intervals, that is, the height and the left and right width intervals of the pair of basket supports 31a in the raised position according to the raising operation of the actuator 12 can be made to have the same height and left and right width intervals.

Accordingly, the basket 11 containing the filter support that has been subjected to the dipping process in the dipping unit 13 is such as at the basket support 31a side of the dipping unit 13 through rolling motion using the ball caster 32. At the same time in the height and left and right width positions, the front end and the rear end of each other can be directly crossed to the basket support 31b side of the weighting unit 26 in which they are connected.

That is, the basket 11 can be moved from the basket support 31a side of the dipping unit 13 to the basket support 31b side of the weighting unit 26 by transfer by a known transfer device (not shown), or , By pulling the basket 11, the operator can move the basket 11 from the basket support 31a side to the basket support 31b side of the weighting unit 26.

Subsequently, the basket 11 moved onto the basket support 31b of the basket holder 25 waits for about 10 seconds to 60 seconds, and during this waiting, the coating liquid on the filter support falls down and the coating liquid recovery tank (24).

In addition, a coating liquid recovery pipe 43 is installed between the coating liquid recovery tank 24 and the dipping tank 10 of the weighting unit 26.

Accordingly, the coating liquid collected in the coating liquid recovery tank 24 can be reused by being sent back to the dipping tank 10 along the coating liquid recovery pipe 43, and is advantageous from an economical point of view by reusing the expensive coating liquid. There is a point.

Here, the coating liquid recovery pipe 43 may be provided with a pump 51 for pressure-feeding the coating liquid to the dipping tank 10 side, and a check valve 52 for preventing reverse flow of the coating liquid.

In particular, the weighting unit 26 includes a vibration generator 50 as a means to more effectively shake off the coating solution on the filter support.

The vibration generator 50 is installed on the basket holder 25 on which the basket 11 is mounted, and vibration according to the operation of the vibration generator 50 is transmitted through the basket 11 to the filter support side contained therein. As it becomes, the coating solution that is excessively applied to the filter support can quickly fall off.

The vibration generator 50 may apply a known air vibrator, etc., and can achieve a set of a compressor (not shown), an air unit (not shown), a solenoid valve (not shown), a timer (not shown), and the like. .

Looking at the linked operation state of the dipping unit 13 and the weighting unit 26 as follows.

First, a basket 11 containing a plurality of filter supports is placed on the basket support 31a in a state where the basket support 31a is raised due to the rising operation of the actuator 12 of the dipping unit 13. .

Next, when the lowering operation of the actuator 12 of the dipping unit 13 causes the entire basket support 31a including the basket 11 containing the filter support to descend, and when the lowering operation of the actuator 12 is completed, , The basket 11 containing the filter support is immersed in the coating liquid in the dipping tank 10 filled with the coating liquid.

Next, after dipping for a certain period of time, when the actuator 12 is operated upward, the entire basket support 31a including the basket 11 containing the filter support coated with the coating liquid is raised to operate the actuator 12 At the same time as the stop, the basket support 31a reaches the rising limit position.

At this time, the basket support 31a on which the basket 11 is placed is at the same height as the basket support 31b in the weighting unit 26.

Next, the basket 11 containing the filter support to which the coating solution is applied by the transfer device or the operator is crossed to the basket support 31b installed in the basket holder 25 on the weighting unit 26, and in this state After waiting for a certain period of time, it can be transferred to the subsequent air knife process.

In this standby state, the coating liquid flows down from the filter support in the basket 11 and falls downward, and the falling coating liquid can be collected in the coating liquid recovery tank 24.

In addition, the filter support coating device includes a dust removal unit 35 as a means for removing foreign substances such as dust attached to the filter support.

The dust remover unit 35 is provided with a washing tank 36 that is disposed in a rear end of the dipping unit 13 and installed in a structure supported on the dipping unit frame 29, and the interior of the washing tank 36 at this time In the air nozzles 27 are installed on both sides of the upper end.

Accordingly, prior to performing the dipping process for the filter support, the filter support is introduced into the inside of the washing tank 36, and then the air nozzle 27 connected to the external air compressor (not shown) side is used. By injecting high-pressure air to the filter support side, foreign matter such as dust attached to the filter support can be removed cleanly.

In addition, the filter support coating device is a means for uniformly dispersing the coating solution applied to a filter support having a dipping process, for example, a filter support having a porous structure such as a foam form or a honeycomb form on a porous surface of the outer surface. It includes an air knife unit (16).

The air knife unit 16 is continuously arranged continuously at the rear end of the dipping unit 13, substantially at the rear end of the weighting unit 26, and is unevenly buried over the inner surface and the outer surface of the filter support. By spreading the coating solution evenly under the pressure of air, it plays a role of allowing the coating solution to be applied to a uniform thickness.

To this end, the upper and lower parts of the conveyor device 14 are provided with air knives 15 disposed across the horizontal direction of the conveyor, and the air discharged from the air knife 15 installed in this way is the conveyor device 14 It can be injected into the upper and lower surfaces, and the inside of the filter support to be transported along.

Accordingly, air injected from the air knife 15, for example, air injected at a pressure of about 0.5 to 1.5 bar is applied to the filter support, so that the coating liquid on the filter support is dispersed by the air pressure. As a result, it spreads evenly, and eventually the coating solution can be uniformly coated not only on the surface of the filter support having a porous structure, but also inside.

Here, the air knife 15 is formed in a long block shape having a slit-shaped air discharge port 53 continuously continuous in a straight line along the knife length direction, and the length of the air discharge port 53 at this time is a conveyor It consists of a relatively large length compared to the width of the filter support to be conveyed, and covers the entire width of the filter support, and air of uniform pressure can be simultaneously sprayed over the entire width of the filter support.

As a result, in the case of a method of injecting air by arranging a plurality of air nozzles in a line at a predetermined interval, it is difficult to make the coating liquid on the filter support to have a uniform thickness due to the formation of overlapping spray regions between adjacent air nozzles.

That is, in the case of the overlapping injection regions between the air nozzles, the coating liquid is relatively sharpened due to the strong pressure compared to the single injection region, and the pressures applied on both sides cross each other, causing the coating liquid to revolve in the pores, etc. The uniformity of the coating between the overlapping section and the non-overlapping section appears differently.

Accordingly, in the case of the method of injecting air using the air knife 15 having the slit-type air outlet port 53 provided by the present invention, even air pressure is applied over the entire width of the filter support while coating liquid on the filter support It is possible to evenly disperse.

Particularly, a plurality of air knives 15 are provided, and each air knife 15 alternately changes the air ejection direction several times to properly jet air to the filter support side, thereby providing the filter support with the required amount of coating liquid. (Amount of coating solution corresponding to the previously set thickness) can be left.

For example, the air knife 15 is a first air knife (15a) and a third air knife (15c) disposed upwards with respect to the conveyor device 14, and the second air knife (15) disposed downwards 15b), wherein the first air knife 12a, the second air knife 15b, and the third air knife 15c may be sequentially arranged with a proper distance difference along the transport direction of the filter support. do.

That is, the upper first air knife 15a is disposed at the front, the second air knife 15b at the bottom is disposed, and the upper third air knife 15c is disposed at the end.

Accordingly, the filter support conveyed to the rear along the conveyor device 14 is firstly subjected to the air pressure injected from the first air knife 15a, and subsequently to the air pressure injected from the second air knife 15b. The air pressure injected from the third air knife 15c is sequentially received.

As a result, the filter support conveyed along the conveyor device 14 is subjected to a total of three air pressures at a time difference from the top to the bottom once, the second to the bottom, the third to the top, etc. This filter support can be applied evenly without clogging in the inner pores.

That is, the first air knife 15a, which is the most advanced, injects primary air from the top to the bottom, continues to allow the filter support 100 to be transported at a certain distance, and then sets a time difference, followed by the second air knife 15b. ) Is spraying secondary air from bottom to top, and the filter support 100 is continuously transported by a certain distance to allow a time difference, and then the third air knife 15c next to it is spraying the tertiary air from top to bottom. , The coating solution can be evenly distributed and applied to the surface of the filter support 100 as well as the pores in the inside.

If air is injected to the porous filter support shown in FIGS. 11 and 12, that is, a porous filter support having a myriad of spaces therein, when the air is sprayed in only one direction, the coating liquid is lowered or In addition to the upward tilting, the coating solution does not spread in the pores inside the filter support, and the coating solution does not disperse with a uniform thickness to the surface as well as the inside, and also sprays air from both directions, but faces each other. When sprayed on the top, the coating liquid is driven to the middle region of the filter support thickness, and the coating liquid does not spread in the pores inside the filter support, and the coating liquid does not spread to a uniform thickness not only on the surface but also inside. In the case of the filter support of FIG. 12 in which the interior space is randomly formed, the phenomenon that the coating solution revolves becomes more prominent).

In consideration of this point, in the present invention, the air pressure is applied to the filter support by applying a total of three air pressures to the filter support, alternately from top to bottom, once from the second time, once from the third time, and from the top to the third time. Evenly distributed on the outer surface of the filter support, it is possible to apply evenly without clogging the inside pores of the filter support.

In addition, the first air knife 15a, the second air knife 15b, and the third air knife 15c are supported by the air knife brackets 27a to 27c so that they can be installed in a structure capable of vertical adjustment. do.

For example, a pair of air knife brackets 27a, 27b, and 27c having a predetermined length are installed on both sides of the conveyor frame 38 of the conveyor device 14 in a vertical posture, and the pair is erected upward. Between the upper ends of each of the air knife brackets 27a and 27c, both ends of the first air knife 15a and the third air knife 15c, which are arranged across the horizontal direction of the conveyor device 14, are installed in a fastening structure. At the same time, between the lower ends of the pair of air knife brackets 27b extending downward, both ends of the second air knife 15b arranged across the left and right width directions of the conveyor device 14 are installed in a fastening structure.

At this time, the air knife brackets (27a, 27b, 27c) is installed in a structure that is fastened by the slot 39 and the slot bolt 40 in the form of a long cut up and down on the conveyor frame 38 side, and accordingly the slot Using the fastening structure of the 39 and the slot bolt 40, the height of the entire air knife brackets 27a, 27b, 27c including the first air knife 15a to the third air knife 15c, that is, the filter support It is possible to adjust the distance to, and eventually it is possible to control the air pressure applied to the filter support through the height adjustment of the first air knife 15a to the third air knife 15c.

In addition, in the air knife unit 16, each air pressure discharged from the first air knife 12a, the second air knife 15b, and the third air knife 15c is appropriately adjusted to be applied to the filter support. It becomes possible to control the coating amount of the coating solution.

For example, the air pressure discharged from the first air knife 12a, the second air knife 15b, and the third air knife 15c is set to be uniform, that is, each air knife has a uniform air pressure. By setting the air to be discharged, it can be adjusted to the weight of the desired coating liquid.

Alternatively, the air pressure discharged from the first air knife 12a, the second air knife 15b, and the third air knife 15c is set to be discharged with a differential, so that it can be adjusted according to the weight of the desired coating liquid. There will be.

As an example, relatively large air in the first air knife 12a, medium air in the second air knife 15b, and small in the third air knife 15c.小) It is possible to control the coating amount (thickness of the coating liquid) of the coating liquid applied to the filter support while discharging each of the air of the capacity.

By controlling the coating amount of the filter support by adjusting the air pressure discharged from each air knife 15 of the air knife unit 16 in this way, the coating amount suitable for each filter support having various specifications and specifications can be easily changed. It is possible to precisely fit, and thus it is possible to increase the efficiency of the coating process of the filter support.

Particularly, the air knife unit 16 includes a constant temperature chamber 44 as a means for uniformly dispersing and applying the coating solution without being affected by a change in viscosity of the coating solution according to a change in ambient temperature.

The constant temperature chamber 44 is disposed between the front dipping unit 13 and the rear hot air drying unit 20 and is installed in a structure supported by the conveyor frame 38 and the like while receiving the air knife unit 16.

The front and rear sides of the constant temperature chamber 44 are formed with inlets and outlets, respectively. Accordingly, the filter support on the dipping unit 13 side is conveyed along the conveyor, and after entering through the inlet of the constant temperature chamber 14, it continues. Thus, it is possible to escape through the exit through the interior of the constant temperature chamber 44.

And, inside the constant temperature chamber 44, a plurality of cartridge heaters 45 for heating the air inside the chamber, at least one or more cooling coils 46 for cooling the air inside the chamber, for detecting the temperature inside the chamber A temperature sensor 47, a fan 48 for circulating air in the chamber, and a fan motor 49 can be installed.

Here, in the case of the cartridge heater 45, a known cartridge heater rod can be applied, and in the case of the cooling coil 46, a type operated in conjunction with a known refrigeration cycle (not shown) can be applied.

Accordingly, by selectively controlling the cartridge heater 45 or the cooling coil 46 by the output control of the controller (not shown) based on the temperature input from the temperature sensor 47, the fan 48 and By operating the fan motor 49, the internal temperature of the constant temperature chamber 44 can be maintained at about 25 to 30° C. at all times, and thus the coating liquid is dispersed inside the constant temperature chamber 44 where a constant temperature environment is always maintained. By performing the air injection process for, it is possible to maintain the viscosity of the coating liquid at a constant level regardless of the ambient temperature to which the equipment belongs, and eventually it is possible to uniformly distribute and apply the coating liquid on the filter support.

In addition, the filter support coating device includes a hot air drying unit 20 as a means for drying the coating solution applied to the filter support.

The hot air drying unit 20 is continuously arranged at the rear end of the air knife unit 16 to continuously coat the coating liquid applied to the filter support, that is, to dry the coating liquid uniformly coated in a desired amount, that is, the coating liquid. It serves to immobilize.

To this end, the hot air drying unit frame 41 is provided with a hot air tunnel 17 in the form of a rectangular box structure with a front inlet and a rear outlet for through-positioning of the conveyor device 14, and thus installed Inside the hot air tunnel 17, a conveyor device 14 parallel to the longitudinal direction of the tunnel is horizontally disposed.

That is, the hot air tunnel 17 is installed in a structure surrounding the periphery of the conveyor device 14, and this hot air tunnel 17 can be formed in a section having a length of about 1.5 to 2.5 m.

Accordingly, the filter support placed and transported on the conveyor device 14 passes through the interior of the hot air tunnel 17, which is formed at a temperature of about 130 to 180° C., and the coating liquid deposited on the filter support during the passage. It can be dried by this hot air.

In addition, the inside of the hot air tunnel 17 is provided with power from the outside at the bottom, that is, the bottom of the conveyor device 14, and a heater 18 for heating air and motor-powered air to operate the heated air inside the tunnel. The hot air fan 19 for blowing into each is installed.

Here, the heater 18 may apply a known cartridge type electric heater, and the hot air fan 19 may apply a known centrifugal (semi-flow type) fan.

Accordingly, when the heater 18 is operated, air around the heater can be heated, and in addition, when the hot air fan 19 is operated, the air heated by the heater 18 is inside the hot air tunnel 17. That is, it can be sent to the side of the filter support to be transported along the conveyor device (14).

In particular, the hot air drying unit 20 is operated in a manner to indirectly inject by inducing a predetermined flow direction rather than directly injecting hot air to the filter support side.

In other words, when hot air is directly sprayed onto the coating solution on the filter support, the coating solution uniformly applied under the influence of the pressure at this time can be thrown to either side, and eventually it can lead to poor coating. In, a method is applied so that hot air can be naturally applied to the filter support side.

To this end, inside the hot air tunnel 17, a duct 28 for hot air induction having a structure leading from the space below the tunnel to which the heater 18 and the hot air fan 19 belong to is located along the inner wall of the tunnel to the space next to the tunnel. do.

Accordingly, the hot air supplied by the operation of the hot air fan 19 is guided to the side spaces on both sides of the tunnel along the hot air induction duct 28, and the hot air induced in this way is formed on both walls of the hot air induction duct 28. That is, after flowing into the space to which the filter support and the conveyor belong through both walls made of a perforated plate having a plurality of holes 54, it is applied from the lateral direction to the filter support on the conveyor device 14, so that the coating liquid on the filter support It is possible to dry the coating liquid naturally without affecting it.

In addition, the filter support coating apparatus includes a room temperature cooling unit 23 as a means for cooling the coating liquid dried on the filter support in succession while being continuously arranged at the rear end of the hot air drying unit 20.

The room temperature cooling unit 23 acts to remove the thermal energy of the coating liquid on the surface of the filter support, which has become hot due to drying, by operating the cooling fan 23 and blowing air into the filter support.

To this end, a cooling duct 21 made of a roof-like structure supported by pillars on the frame is installed at the upper portion of the conveyor unit 14 at the room temperature cooling unit frame 42, and the frame at the bottom of the conveyor unit 14 is installed. A cooling fan 22 having a structure supported on it is installed.

Here, the cooling fan 22 can be made of a plurality of arranged in parallel along the longitudinal direction of the conveyor device (14).

Accordingly, by blowing air to the cooling fan 22 from the bottom of the filter support placed and transferred to the conveyor device 14, the coating solution on the filter support, that is, the coating solution buried in a dried state is immediately cooled, and then on the filter support. It can be fixed right away.

In addition, the filter support coating device includes a conveyor device 14 as a means for conveying the filter support.

The conveyor device 14 supports the filter support while being installed across the chain between the conveyor drive motor 14a installed on the conveyor frame 38, the chain transmission device 14b, the chain transfer device 14c, and both chains. Note may include an adapter (not shown) and the like.

The conveyor device 14 is continuously installed over the area of the air knife unit 16, the area of the hot air drying unit 20, and the area of the room temperature cooling unit 23, whereby a plurality of filter supports is a conveyor device ( 14) As it is placed and transferred, it is possible to go through the area of each unit.

In particular, the present invention provides a method for more efficiently performing a process in each unit through speed control of the conveyor device 14, that is, by controlling the speed at which the filter support is conveyed.

For example, in the case of the drying process in the hot air drying unit 20, the air amount (air pressure) and the drying temperature must be calculated and set in combination, and if the conveyor speed is fast, the drying time is reduced and surface drying is not performed. Even if the amount of air is strong, if the passing speed is high, the pressure of the air does not reach exactly, and the desired result cannot be obtained.

Accordingly, the optimum speed of the conveyor device 14 is preferably 0.01 to 0.02 m/sec (5 g/10 ^-4 m ³ condition, drying temperature 130 to 180°C).

Meanwhile, a process of coating the coating solution on the filter support using the filter support coating device configured as described above will be described below.

The present invention shows a process of coating a photocatalyst coating solution on a filter support by a dipping method and drying and cooling the same.

Usually, a method of coating a filter support such as foam or honeycomb is generally a spray method and a dipping method.

Although the spray method sprays the coating solution in one direction or both directions according to the shape characteristics of the filter support, it cannot be coated properly inside the filter support.

The dipping method is a method in which the filter support is completely immersed in a coating solution to coat, and evenly coating is possible to the inside of the filter support by using the ability to absorb moisture of the ceramic material as the material of the filter support.

However, most of the existing dipping methods do not control the amount of coating, blocking air gaps for air passage, so that this portion cannot be utilized, or the powder of the powder is scattered at an incorrect portion of the filter support and the coating solution. do.

In order to improve this, the present invention provides a method of coating in the following process by utilizing the coating device as described above.

That is, when coating the filter support in the form of a porous structure or a honeycomb with a hollow structure in a dipping method, the state in the dipping process of supporting the coating solution on the first filter support naturally flows down due to the application of excessive coating solution. Therefore, the loss is weighted, and the surface is hardened over time, so that the specification of the product cannot be determined. Therefore, in order to solve this problem, the coating process of the filter support must be continuously performed.

Therefore, immediately after dipping, only the required amount of the coating liquid should be left using air to ensure that only the appropriate amount of the coating liquid without clogging of the pores is applied to the filter support.

At this time, since the coating solution has fluidity on the filter support, it is of course necessary to minimize change factors in product specification determination through rapid surface drying.

To this end, a dipping process, an air blower process (air knife process), a drying process, and a cooling process must be performed as a continuous process.

In addition, it is essential to perform a process for cooling to room temperature immediately after the hot air drying process.

The ceramic material, which is usually used as a material for the filter support, is a porous material, so a lot of coating liquid is supported therein.

Since the process of drying the surface of the filter support is a process for eliminating variations in product specifications, the fluidity of the supported coating liquid is not completely removed, and only the fluidity of the surface is removed.

That is, the inside of the filter support has a liquid state with fluidity, and the surface has a solid form.

When pressure is applied to the entire surface that is heated due to drying, the heat moves to the inside, thereby causing the movement of a fluid (coating liquid), which in turn may cause the loaded coating liquid to flow again.

In order to prevent this, the cooling process is performed immediately after the drying process to remove thermal energy on the surface, so that the coating solution on the surface of the filter support as well as the coating solution on the filter support can be stably fixed.

In addition, the present invention provides a method of controlling the coating amount through an air blower process (air knife process) in order to secure performance according to the weight of the coating solution coated on the filter support.

The position of the air jet using the air knife is from the top to the bottom and the top is suitable for a structure without clogging holes in the coating liquid adjustment process.

That is, by applying a suitable air jet position to the porous filter support, the coating amount on the porous filter support can be more efficiently controlled.

At this time, the amount of air can be adjusted to a desired weight between 0.5 and 1.5 bar (the amount of coating decreases as the amount of air is counted, and if the weight is less than a certain amount, deterioration in performance may occur).

First, as a first step, a step of applying the coating solution to the filter support is carried out by soaking the filter support in a dipping tank filled with the coating solution and taking it out.

That is, a step in which a known photocatalytic coating solution is sufficiently deposited on each filter support in the basket by lowering and raising the entire dipping tank with cylinder power while the plurality of filter supports are mounted in the basket.

In addition, prior to performing the dipping process, a dust removal process, that is, a washing process, may be performed. In this case, dust or the like deposited on the filter support may be removed through an air shower process using an air nozzle.

In addition, after performing the dipping process (後) as a pre-step before performing the air knife process, a step of performing a weighting process may be selectively performed.

That is, immediately after soaking and removing the filter support in the dipping tank, a larger amount of coating liquid may be deposited on the filter support than necessary. It is preferable to perform effective coating amount control in the subsequent air knife process, which prevents waste of coating solution.

Next, as a second step, after the first step is completed, a step of uniformly spraying the coating solution by spraying air with an air knife on the filter support to which the coating solution is applied is performed.

That is, before the coating solution applied to the surface and the inside of the filter support naturally flows down or hardens over time, it becomes difficult to determine the product's specifications (coating amount), and immediately after the dipping process (excessive coating solution Immediately after removal to some extent) by spraying air from the top and bottom using an air knife, while preventing clogging of pores inside the filter support, only the required amount of the coating solution applied to the filter support remains.

In addition, the weight of the coating liquid is controlled according to a desired product specification by appropriately adjusting the injection pressure of air.

For example, a process of adjusting the coating amount of the coating liquid applied to the filter support by adjusting the air pressure discharged from the air knife, and discharging air from the top and bottom of the filter support when discharging air with the air knife By applying a process to allow air to penetrate into the inside of the filter support while air hits the top and bottom surfaces of the filter support, it is applied to the inside of the filter support as well as to the surface of the filter support while preventing clogging of the pores inside the filter support Only the required amount of coating solution can be left, and eventually, the coating amount and coating quality of a product that meets the desired specifications can be secured.

And, by setting the injection direction of the air through the air knife to the top and the bottom without setting to either side, it is possible to distribute the coating liquid evenly while properly controlling the flow of the coating liquid having the characteristic of flowing down by gravity. have.

Next, as a third step, after the second step, a step of drying the coating solution by advancing the filter support coated with the coating solution into the hot air tunnel is performed.

That is, after passing through the air knife process, the filter support in a state where the coating solution is adjusted to an appropriate coating amount immediately enters the hot air tunnel, and the coating solution on the filter support is continuously dried under a hot air environment maintained at a temperature of about 130 to 180°C. To fix the coating solution.

In other words, even after the air knife process, since the coating liquid is fluid on the filter support, the change factor of product specification is minimized through rapid surface drying by the hot air drying step.

In the third step, by using the hot air induction duct installed inside the hot air duct, the hot air rises up through the side and then flows downward to indirect hot air supplying process to be supplied to the filter support, thereby applying pressure to the hot air. Influence by can be completely excluded, and eventually it can help to stabilize and immobilize the coating solution.

Next, as a fourth step, after the third step, a step of naturally cooling at room temperature by spraying air with a cooling fan to the filter support on which the coating solution is applied in a dry state is performed.

That is, after completing the hot air drying process, by blowing air in the air with a cooling fan into the filter support in a hot state exiting the hot air tunnel to remove thermal energy, that is, cooling at room temperature, the coating liquid on the filter support It can be firmly fixed once more, and at the same time, it can maintain the surface cooling state, thereby facilitating operations such as transportation to a subsequent process, and also prevents coating liquid from being dehydrated inside the undried filter support.

In addition, the filter support that has completed the fourth-stage cooling process at room temperature is subjected to a heat treatment process, which is a subsequent process, and is then heat-treated in an oven of high temperature forced convection, whereby organic matter is removed and coating-related stabilization can be achieved.

By completing the first to fourth steps and subsequent heat treatment processes as described above, as shown in FIGS. 11 and 12, a deodorizing filter 110 coated with a photocatalyst coating solution on the porous filter support can be manufactured. .

[Table 1] below shows the performance evaluation result by the difference in the coating method, and it can be seen that when the dipping method of the present invention is applied, it is possible to secure an excellent deodorization rate compared to the spray method.

[Table 1]

[Table 2] below shows the performance evaluation results due to the coating weight difference, and when the coating weight adjustment is impossible, it is necessary to apply the dipping method of the present invention because it may be a decisive factor deteriorating the performance of the filter. have.

[Table 2]

[Table 3] below shows the results of weight control of the coating liquid according to the air pressure using three air knives 15a, 15b, and 15c, and three air knives 15a, 15b, and 15c are properly arranged and air It can be seen that the coating amount coated on the filter support can be effectively controlled by appropriately setting the direction in which the pressure is applied up and down.

[Table 3]

As described above, in the present invention, a coating device and a coating method optimized for a porous filter support in the form of foam, honeycomb, etc., that is, a dipping process by a dipping unit, an air knife by an air knife unit By providing a new type of coating device that combines the process, the hot air drying process by the hot air drying unit, and the normal temperature cooling process by the normal temperature cooling unit, the efficiency of the coating process can be improved and the coating quality can be secured. A photocatalyst deodorizing filter having a long lamp life, excellent performance, and a wide range of use can be manufactured.

10: dipping tank
11: Basket
12: actuator
13: dipping unit
14: conveyor device
15: air knife
16: Air knife unit
17: hot air tunnel
18: heater
19: hot air fan
20: hot air drying unit
21: cooling duct
22: cooling fan
23: room temperature cooling unit
24: coating liquid recovery tank
25: basket holder
26: weight unit
27a,27b,27c: Air knife bracket
28: hot air induction duct
29: dipping unit frame
30: coating liquid tank
31a,31b: Basket support
32: ball caster
33: cylinder block
34: guide bar
35: dust remover unit
36: washing tank
37: air nozzle
38: conveyor frame
39: slot
40: slot bolt
41: hot air drying unit frame
42: Room cooling unit frame
43: piping for coating solution recovery
44: constant temperature chamber
45: cartridge heater
46: cooling coil
47: temperature sensor
48: fan
49: fan motor
50: vibration generator
51: pump
52: check valve
53: air outlet
54: hall

Claims (8)

A device for coating a coating solution on the surface and inside of a porous filter support such as a foam form or a honeycomb form,
The dipping tank 10 filled with the coating solution, the basket 11 for accommodating the plurality of filter supports, and the basket 11 are driven up and down to immerse the basket 11 into the dipping tank 10 or the basket A dipping unit (13) composed of an actuator (12) for taking out (11) the outside of the dipping tank (10);
The rear end of the dipping unit 13 is continuously disposed to uniformly disperse the coating liquid applied to the filter support, and at least one or more air knives for spraying air to the filter support transferred along the conveyor device 14 ( 15) an air knife unit 16;
A hot air tunnel (17) that is disposed continuously at the rear end of the air knife unit (16) to dry the coating solution applied to the filter support, and is installed in a structure surrounding the periphery of the conveyor device (14) to which the filter support is transferred. ), a hot air drying unit 20 installed inside the hot air tunnel 17 and configured with a heater 18 and a hot air fan 19 to supply hot air;
A cooling duct 21 which is continuously disposed on the rear end of the hot air drying unit 20 to cool the coating liquid dried on the filter support, and is installed on the top of the conveyor device 14 to which the filter support is transferred, A room temperature cooling unit 23 composed of a cooling fan 22 installed under the conveyor device 14;
Filter support coating device comprising a.
The method according to claim 1,
The dipping unit 13 is a coating solution connected between the coating solution recovery tank 24 and the basket holder 25, and the dipping tank 10 and the recovery tank 24 installed side by side on one side of the dipping tank 10 A filter support coating device comprising a return pipe (43), and further comprising a weighting unit (26) for recovering and reusing part of the coating solution excessively applied to the filter support.
The method according to claim 2,
The weighting unit 26 is installed on the basket holder 25 to apply vibration to the basket 11 containing the filter support, thereby allowing the coating solution excessively applied to the filter support to fall off quickly. Filter support coating device comprising a.
The method according to claim 1,
The air knife 15 of the air knife unit 16 is a first air knife 15a and a third air knife 15c at the top and a second air knife 15b at the bottom based on the conveyor device 14. It is configured, and the filter support, characterized in that the first air knife 12a, the second air knife 15b and the third air knife 15c are sequentially arranged at a distance from each other along the transport direction of the filter support. Coating device.
The method according to claim 4,
The first air knife (12a), the second air knife (15b) and the third air knife (15c) is supported by the air knife bracket (27a ~ 27c), characterized in that installed in a structure that can be adjusted up and down height Filter support coating device.
The method according to claim 4 or claim 5,
The air pressure discharged from the first air knife 12a, the second air knife 15b, and the third air knife 15c is controlled, so that the coating amount of the coating solution applied to the filter support can be controlled. Filter support coating device characterized in that.
The method according to claim 1,
The hot air drying unit 20 is a hot air induction duct installed along the inner wall of the hot air tunnel 17 so that the hot air supplied by the hot air fan 19 rises up through the side and then flows downward to be supplied to the filter support. Filter support coating apparatus characterized in that it further comprises (28).
The method according to claim 1 or claim 4,
It further includes a constant temperature chamber 44 for receiving the air knife unit 16 while having a front inlet and a rear outlet, and the constant temperature chamber 44 includes a cartridge heater 45 for heating and cooling the air inside the chamber. A filter support coating device comprising a cooling coil (46), a temperature sensor (47) for sensing the temperature inside the chamber, a fan (48) and a fan motor (49) for circulation of air inside the chamber.

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