KR101083713B1 - Non heating type compressed air drying system - Google Patents

Abstract

PURPOSE: A non-heating mode-based compressed air drying system is provided to reduce malfunction causing factors and to improve economic feasibility by omitting a heating wire exchanging process. CONSTITUTION: A non-heating mode-based compressed air drying system(1) includes a drying tank part(200), a pre-treating part(300), a post-treating part(400), and a controlling part(600). A drying agent is contained in the drying tank part and includes a pair of drying tanks(210, 220). The drying tanks are capable of being connected to each other and alternately implement a drying process and a regenerating process. Compressed air is introduced into the drying tanks by the pre-treating part. The dried compressed air is discharged from the drying tank by the post-treating part. The controlling part implements a drying process and a drying agent regenerating process.

Description

Non-heated compressed air drying system {NON HEATING TYPE COMPRESSED AIR DRYING SYSTEM}

The present invention relates to a compressed air drying system, and more particularly, to a non-heated compressed air drying system for drying and regenerating air without using a heating method by a heat source.

Recently, the use of ultra-dry air is gradually increasing in various industrial fields.

The production of conventional ultra-dry air proceeds by a cycle in which dry air is dried using a drying agent, and the drying agent is heated and regenerated by a heat source. However, the method of regenerating the desiccant by the heat source has a disadvantage of low economical efficiency due to the consumption of power and desiccant, the cost for exchanging heating wires required for regenerating the desiccant, and the like.

There is a need for a new non-heated compressed air drying system that can regenerate the desiccant without using a heat source.

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-heated compressed air drying system in which a regeneration process is performed using regenerated air that is dried by a desiccant without using a heat source for regenerating the desiccant. .

The above objects and various advantages of the present invention will become more apparent from the preferred embodiments of the present invention by those skilled in the art.

One aspect of the present invention for achieving the above technical problem relates to a non-heated compressed air drying system for drying the compressed air.

The non-heated compressed air drying system of the present invention includes: a drying tank unit having a pair of drying tanks accommodating a desiccant therein and being communicable with each other to alternately perform a drying process and a regenerating process; A pretreatment unit for introducing compressed air into the pair of drying tanks; A post-processing unit for discharging the compressed air dried in the pair of drying tanks; The compressed air introduced through the pre-treatment unit is introduced into the first drying tank of the pair of drying tanks to proceed with the drying process, and the second drying tank which is not compressed air is dried in the first drying tank. It is characterized in that it comprises a control unit for controlling the progress of the regeneration process for regenerating the desiccant by introducing a portion of the air.

According to one embodiment, the drying tank unit, the first drying tank and the second drying tank filled with a drying agent; A dry air communication pipe connecting the first drying tank and the second drying tank to each other; An orifice provided on the dry air communication tube to expand dry air by a pressure difference to generate regenerated air; An air amount control valve for controlling an amount of dry air moving between the first drying tank and the second drying tank through the orifice; It includes a dynamic pressure valve and a dynamic pressure control valve for equally adjusting the pressure of the first drying tank and the second drying tank.

According to one embodiment, the control unit, after the regeneration process is completed to press the second drying tank in which the regeneration process is performed to achieve the same pressure as the first drying tank, and then switching between the first drying tank and the second drying tank. Let's do it.

According to one embodiment, the pre-treatment unit, the air header for receiving the compressed air produced by a plurality of compressors to supply toward the drying tank; A precooler for lowering the temperature of the compressed air supplied from the air header; It includes a pre-filter for removing the foreign matter and condensate contained in the compressed air.

According to one embodiment, the after-treatment unit, the after-filter for removing the desiccant foreign matter contained in the dry air discharged from the drying tank unit; And an aftercooler for lowering the temperature of the dry air.

According to an embodiment, the control unit controls the drying process and the regeneration process of the drying tank part to be alternately performed by a manual method or an automatic method.

In the non-heated compressed air drying system according to the present invention, since a heat source is not used for the regeneration of the desiccant, power and desiccant consumption, replacement of the heating wire required for the regeneration of the desiccant may be unnecessary, thereby increasing economic efficiency.

In addition, it is possible to increase the economical efficiency because it does not require the ordinary ratio necessary for the exchange of the desiccant of the heating method.

In addition, compared with other conventional drying method, the overall size is small and the driving process is simple, so that the occurrence of failure can be reduced.

Figure 1 is a schematic diagram schematically showing the overall configuration of the non-heated compressed air drying system of the present invention.

In order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Embodiment of the present invention may be modified in various forms, the scope of the invention should not be construed as limited to the embodiments described in detail below. This embodiment is provided to more completely explain the present invention to those skilled in the art. Therefore, the shape of the elements in the drawings and the like may be exaggerated to emphasize a more clear description. It should be noted that the same members in each drawing are sometimes shown with the same reference numerals. Detailed descriptions of well-known functions and configurations that are determined to unnecessarily obscure the subject matter of the present invention are omitted.

1 is a schematic diagram schematically showing the overall configuration of a non-heated compressed air drying system 1 according to the present invention.

In the non-heated compressed air drying system 1 according to the present invention, a pair of drying tanks filled with a desiccant alternately dry and regenerate the compressed air. At this time, the regeneration process is carried out by using the regeneration air as a part of the dry air dried by the drying process. Thus, the desiccant can be regenerated without a separate heat source.

The non-heated compressed air drying system 1 according to the present invention includes a drying tank unit 200 having a pair of drying tanks 210 and 220 in which a drying process and a regeneration process are alternately performed, and a compressor (not shown). The pre-treatment unit 300 passing through the compressed air before it is introduced into the drying tank unit 200, and the post-treatment unit 400 passing through the drying air after drying in the drying tank unit 200 is discharged to the outside; An air transfer pipe 500 for moving the compressed air to the respective components, and a control unit 600 for controlling the operation of each component.

The drying tank 200 to dry the compressed air. The drying tank unit 200 is dried by connecting the first drying tank 210 and the second drying tank 220 and the first drying tank 210 and the second drying tank 220 filled with a drying agent therein. The dry air communication pipe 230, which moves air, the orifice 240 provided on the dry air communication pipe 230 to expand the dry air to generate regenerated air, and is provided on the dry air communication pipe 230 and the first A plurality of check valves (251, 252, 253, 254) to be selectively opened and closed according to the operation type of the drying tank 210 and the second drying tank 220 to control the inflow of dry air and the orifice 240 of the regeneration air Air volume control valve 261 for controlling the amount to control the regeneration pressure, the dynamic pressure valve 263 and the dynamic pressure control valve for adjusting the pressure of the first drying tank 210 and the second drying tank 220 to be equal ( 265 is provided.

The first drying tank 210 and the second drying tank 220 is provided in a tank shape having a predetermined volume so that the desiccant can be accommodated therein. The desiccant accommodated in the first drying tank 210 and the second drying tank 220 is provided as a compressed air drying only product having a high adsorption capacity of moisture. The desiccant is controlled to maintain maximum dehumidification through a complete regeneration process. The desiccant life is about 3 years and samples are taken and replaced when the desiccant turns brown or black or becomes viscous.

Desiccant may be provided with Alumina-Gel or Molecular Sives, Silicagel, and may be selected according to the operating conditions.

The first drying tank 210 and the second drying tank 220 are alternately dried and regenerated under the control of the controller 600. That is, when the first drying tank 210 is a drying process, the second drying tank 220 is regenerated, and when the process cycle is completed, the second drying tank 220 is switched to each other so that the first drying tank 210 is regenerated. The drying tank 220 is a drying process is in progress.

The drying process and the regeneration process take place at the same time. Here, after the drying process and the regeneration process, a dynamic pressure process for controlling the pressures of the two drying tanks in the same manner is performed. The drying tank, which has been regenerated for dynamic pressure, is pressurized.

The drying tank in which the drying process proceeds normally has a pressure of about 7kg / ㎠, and the drying tank in which the regeneration process proceeds usually has a pressure of 0.5kg / ㎠ or less, so that the pressure difference when regeneration and drying are performed under different pressure conditions The pulsation is generated. To prevent this, pressurize the drying tank during the regeneration process so that the pressure of the pair of drying tanks is the same and then switch.

For example, when the drying process and the regeneration process are performed for 5 minutes, the drying time of the drying tank during the drying process is 4 minutes and 36 seconds, the equalization time is 24 seconds, and the regeneration time of the drying tank during the regeneration process is 4 minutes 36 seconds, the pressurization time may proceed to 24 seconds.

Here, since the drying agent filled in the drying tanks 210 and 220 is sensitive to temperature and moisture, the inlet temperature of the drying tanks 210 and 220 is adjusted not to be 40 ° C. or higher, and condensate is not introduced into the inside.

When Alumina-Gel is used as a desiccant, the dew point is set to be -20 ° C or lower at an inlet temperature of 40 ° C and a pressure of 8kg / cm2. A dew point sensor 630 is provided to measure the dew point temperature at the inlet of the drying tanks 210 and 220.

Meanwhile, pressure gauges 267a and 267b are installed in the first drying tank 210 and the second drying tank 220, respectively. The drying process is carried out in the drying tank at the higher pressure and the regeneration process is performed in the drying tank at the lower pressure. For dynamic pressure, the pressure of the drying tank which is being regenerated rises to be equal to the pressure of the drying tank which is being dried, and after a certain time after the start of the dynamic pressure process, the pressure gauge is adjusted to have a pressure opposite to that of the first.

Dry air communication pipe 230 is interconnected so that the air dried in the drying tank of the drying process of the first drying tank 210 and the second drying tank 220 is moved to the drying tank in which the regeneration proceeds. Some of the drying air dried in the drying tank in the drying process is moved through the dry air communication pipe 230. The amount of dry air moved is controlled by the air volume control valve 261.

Orifice 240 expands dry air to produce regenerated air. The dry air passes through the orifice 240 and expands due to the pressure difference before and after the passage. As a result, the expanded regenerated air is increased relative to the amount of dry air before passing through the orifice 240. The generated regenerated air is moved from the upper part to the lower part of the drying tanks 210 and 220 where the regeneration process is performed, and regenerates the desiccant by absorbing the moisture of the desiccant containing moisture through the drying process in the previous cycle.

The ideal amount of regenerated air is set to a fixed value by the orifice 240, but can be adjusted by the air amount control valve 261. If the amount of regenerated air is excessive, the production cost of the dry air is increased due to the consumption of unnecessary dry air, on the contrary, if the amount of the regenerated air is insufficient, the regeneration of the desiccant is incomplete, resulting in a higher dew point. Therefore, the air amount regulating valve 261 is adjusted so that the regeneration pressure is 1.5 kg / cm 2.

If the equalization time of the first drying tank 210 and the second drying tank 220 is not achieved within the equalization time, the regeneration air is insufficient, and if the equalization of the two drying tanks faster than the equalization time is achieved, the regeneration air is excessive. . Therefore, the air amount regulating valve 261 is used by judging the equalization time and adjusting it appropriately.

The dynamic pressure valve 263 and the dynamic pressure control valve 265 are adjusted to achieve dynamic pressure of the two drying tanks 210 and 220 when the dynamic pressure valve 263 is opened.

The plurality of check valves 251, 252, 253, and 254 are opened and closed according to the operation type of the pair of drying tanks 210 and 220 to supply regeneration air. The first check valve 251 prevents backflow when the dry air dried in the first drying tank 210 passes and flows to the second drying tank 220. The second check valve 252 prevents backflow when the dry air dried in the second drying tank 220 passes and flows to the first drying tank 210.

The third check valve 253 and the fourth check valve 254 allow the regenerated air generated through the orifice 240 to flow into the second drying tank 220 and the first drying tank 210, respectively.

      Here, the inflow path of the dry air when the first drying tank 210 is dry, the second drying tank 220 is regeneration, the dry air discharged from the first drying tank 210 is the first check valve 251 After passing through the orifice 240 through the conversion to the regeneration air, the regeneration air is supplied to the second drying tank 220 via the fourth check valve (254). The regenerated air moving from the upper part of the second drying tank 220 to the lower part and regenerating the desiccant is discharged to the fuzz muffler 530 through the 2-way on / off valve 520b.

When the second drying tank 220 is dried and the first drying tank 210 is regenerated, regeneration air is supplied to the first drying tank 210 through the second check valve 252 and the third check valve 253. It is introduced and discharged to the fuzz muffler 530 through the 2-way on / off valve 520a.

Opening and closing of the plurality of check valves 251, 252, 253, 254 is controlled by the controller 600.

The pretreatment unit 300 removes the foreign matter and lowers the temperature before the compressed air compressed by the compressor (not shown) flows into the drying tank 200. The pretreatment unit 300 includes an air header 310 for condensing compressed air into one place, a precooler 320 for lowering the temperature of the compressed air, and a prefilter 330 for removing foreign substances contained in the compressed air. Include.

The air header 310 collects compressed air produced by various compressors (not shown) into one place and supplies the same to a single supply line. In addition, the air header 310 can minimize the pulsation generated during the operation of the compressor (not shown), switching of the non-operation, and also condenses a small amount of water to remove moisture.

The precooler 320 increases the temperature of the compressed air to about 80 ° C. by the heat of compression generated by the production of compressed air in a compressor (not shown), and heats it with cold water to lower the temperature of the compressed air to about 40 ° C. By removing the condensate generated by the increase the dehumidification efficiency of the drying tank (210,220). In addition, the precooler 320 also removes condensed water condensed by heat exchange and a small amount of oil discharged from a compressor (not shown).

 The prefilter 330 is installed to remove foreign substances and condensate. This is to prevent the desiccant from coming into direct contact with the condensate. Inside the prefilter 330, foreign substances of 1 μm or more are effectively removed by using a centrifugal force, impact, and separation method of filtration. The condensate generated at this time is discharged to an auto trap (not shown).

The aftertreatment unit 400 removes the foreign matter and lowers the temperature before the dry air dried in the drying tanks 210 and 220 is discharged to the outside. The post processing unit 400 includes an after filter 410 and an after cooler 420.

The after filter 410 removes 1 μm or more of the desiccant debris that may be contained in the dry air via the drying tanks 210 and 220, thereby preventing a failure of the process instrument.

The aftercooler 420 causes the exothermic reaction to occur while the desiccant rapidly absorbs moisture as the compressed compressed air passes through the drying tanks 210 and 220, causing a rise in the temperature of the dry air, thereby lowering the temperature of the corresponding dry air. do.

The air transfer pipe 500 discharges from the compressor (not shown) and provides a transfer path of the compressed air until the compressed air introduced into the air header 310 is discharged to the outside. The air transfer pipe 500 is formed in one direction and is provided with a plurality of valves for controlling the transfer direction of the compressed air at each branch point.

The three-way shuttle valve 510 is provided with a non-powered, oil-free valve to control the transfer path of the wet compressed air at the inlet side of the drying tank (210, 220). The three-way shuttle valve 510 is selectively opened and closed under the control of the controller 600 so that the compressed air alternately flows into the first drying tank 210 or the second drying tank 220. The three-way shuttle valve 510 is switched under the control of the first solenoid valve 621 to change the conveying direction of the compressed air.

The two-way on / off valves 520a and 520b operate during the pressurizing and regenerating process of the pair of drying tanks 210 and 220 and allow the dynamic pressure valve 263 and the dynamic pressure control valve 265 to be switched. In addition, after the regeneration process is completed, the regeneration air discharged out of the drying tanks 210 and 220 is discharged to the outside through the fuzz muffler 530.

The fuzz muffler 530 is a silencer installed to minimize the noise generated when the pair of drying tanks 210 and 220 exhaust the compressed air to achieve dynamic pressure. In addition, the fuzz muffler 530 moves the drying tanks 210 and 220 and discharges the regenerated air that has regenerated the desiccant to the outside.

The controller 600 controls the respective components such that the pair of drying tanks 210 and 220 alternately perform a drying process and a regeneration process according to a cycle. The controller 600 is provided in the form of a control panel in which a control circuit is accommodated.

The dew point meter 600a and the pressure switch 600b are provided inside the controller 600. The controller 600 controls the plurality of control valves 620 to control the movement direction of the pressure air and the operation of the pair of drying tanks 210 and 220.

The control valve 620 includes a first solenoid valve 621, a second solenoid valve 623, a third solenoid valve 625, and a fourth solenoid valve 626.

The first solenoid valve 621 serves to adjust the three-way shuttle valve 510 for controlling the conveying direction of the compressed air. Under the control of the controller 600, the first solenoid valve 621 is turned on / off to allow the three-way shuttle valve 510 to operate in conjunction. Accordingly, the compressed air is alternately transferred to the first drying tank 210 and the second drying tank 220.

The second solenoid valve 623 allows the two-way on / off valve 520a on the first drying tank 210 side to be driven. Under the control of the controller 600, the second solenoid valve 623 is turned on / off so that the two-way on / off valve 520a at the side of the first drying tank 210 is interlocked to operate. Accordingly, the 2-way on / off valve 520a is closed at the time of dynamic pressure, and the 2-way on / off valve 520a is opened when the second drying tank 220 is in the drying process so that the regeneration air is a fuzz muffler 530. To be discharged.

The third solenoid valve 625 drives the 2-way on / off valve 520b on the side of the second drying tank 220. That is, during dynamic pressure, the two-way on / off valve 520b is closed, and when the first drying tank 210 is in the drying process, the two-way on / off valve 520b is opened to allow the regenerated air to be discharged through the fuzz muffler 530.

The fourth solenoid valve 626 is for driving the dynamic pressure valve 263, the dynamic pressure valve 263 is opened at the time of dynamic pressure, so that the first drying tank 210 and the second drying tank 220 at a given time has a dynamic pressure. And the dynamic pressure valve 263 is closed immediately before discharge of the compressed air is made.

The dew point sensor 630 measures the dew point temperature of the inlet region of the first drying tank 210 and the second drying tank 220 and transmits it to the control unit 600. Accordingly, the controller 600 controls the amount of regenerated air to be equal to or higher than the set dew point temperature when the dew point temperature is lower than the set dew point temperature according to the type of desiccant.

The air filter 640 removes the foreign matter contained in the air dried through the first drying tank 210 and the second drying tank 220 in advance, and then is supplied to the aftertreatment unit 500.

The operation of the non-heated compressed air drying system 1 according to the present invention having such a configuration will be described with reference to FIG. 1.

First, when compressed air is introduced from a compressor (not shown), the compressed air moves along the air transfer pipe 500 through the air head 310, the precooler 320, and the prefilter 330 of the pretreatment unit 300. do.

Here, when the first drying tank 210 is a drying process, the second drying tank 220 processes the regeneration process, the control unit 600 is a three-way shuttle valve 510 through the first solenoid valve 621 Compressed air is controlled to flow into the first drying tank (210). The compressed air in the wet state is in contact with the desiccant while moving from the bottom of the first drying tank 210 to the top, and the desiccant adsorbs moisture contained in the compressed air to quickly dry the compressed air.

At this time, a part of the dry air dried in the first drying tank 210 is moved through the dry air communication pipe 230, and through the orifice 240 in accordance with the opening of the first check valve 251 to the regeneration air Is converted. The regenerated air flows into the second drying tank 220 according to the opening of the fourth check valve 254, moves from the upper part of the second drying tank 220 to the lower part thereof, and contacts with the desiccant containing moisture. Absorbs and regenerates the desiccant.

The regenerated air that has regenerated the desiccant is discharged through the fuzz muffler 530 in accordance with the opening of the 2-way on / off valve 520b.

On the other hand, the drying air is dried in the first drying tank 210 is transferred to the outside via the after filter 410 and the after cooler 420 of the after-treatment unit 400.

Here, the drying process and the regeneration process are made in the same time, and include a pressure equalization time and a pressurization time.

When the drying of the compressed air is completed in the first drying tank 210 and the regeneration of the second drying tank 220 is completed, the three-way shuttle valve 510 is switched so that the compressed air flows into the second drying tank 220. do. That is, the second drying tank 220 is a drying process, the first drying tank 210 is to handle the regeneration process.

As described above, since the heat source is not used for the regeneration of the desiccant, the non-heated compressed air drying system according to the present invention can increase the economical efficiency by eliminating the power and the consumption of the desiccant and the exchange of the heating wire required for the regeneration of the desiccant.

In addition, the non-heating drying method does not require the ordinary ratio required for the drying of the heating method, it is possible to increase the economic efficiency.

In addition, compared with other conventional drying method, the overall size is small and the driving process is simple, so that the occurrence of failure can be reduced.

On the other hand, in the non-heating compressed air drying system according to the present invention, the control unit may be automatically operated according to the set conditions, or may be operated by a manual method. In the case of the manual method, the first drying tank side and the second drying tank side may be driven manually.

The embodiment of the non-heated compressed air drying system of the present invention described above is merely exemplary, and those skilled in the art to which the present invention pertains can make various modifications and other equivalent embodiments therefrom. You will know well. Therefore, it will be understood that the present invention is not limited to the forms mentioned in the above detailed description. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

1: Non-heated compressed air drying system
200: drying tank section 210: first drying tank
220: second drying tank 230: dry air communication pipe
240: orifice 251: first check valve
252: second check valve 253: third check valve
254: fourth check valve 261: air flow control valve
263: dynamic pressure valve 265: dynamic pressure control valve
267a, b, c: Pressure gauge 300: Pretreatment
310: air header 320: precooler
330: pre-filter 400: post-processing unit
410: after filter 420: after cooler
500: air transfer pipe 510: 3-way shuttle valve
520a, b: 2-way on / off valve 530: fuzz muffler
600: control unit 610: control panel
620: control valve 621: first solenoid valve
623: second solenoid valve 625: third solenoid valve
627: fourth solenoid valve 630: dew point sensor
640: Air Filter

Claims (6)

In a non-heated compressed air drying system for drying compressed air,
A drying tank unit accommodating a drying agent therein and having a pair of drying tanks which alternately communicate with each other to perform a drying process and a regenerating process;
A pretreatment unit for introducing compressed air into the pair of drying tanks;
A post-processing unit for discharging the compressed air dried in the pair of drying tanks;
The compressed air introduced through the pre-treatment unit is introduced into the first drying tank of the pair of drying tanks to proceed with the drying process, and the second drying tank which is not compressed air is dried in the first drying tank. It includes a control unit for controlling the progress of the regeneration process for regenerating the desiccant by introducing a portion of air,
The drying tank unit,
A first drying tank and a second drying tank filled with a desiccant;
A dry air communication pipe connecting the first drying tank and the second drying tank to each other;
An orifice provided on the dry air communication tube to expand dry air by a pressure difference to generate regenerated air;
A plurality of check valves provided on the dry air communication pipe and selectively opened and closed according to the operation types of the first drying tank and the second drying tank to control the inflow of dry air;
An air amount control valve for controlling an amount of dry air moving between the first drying tank and the second drying tank through the orifice;
It includes a dynamic pressure valve and a dynamic pressure control valve for equally adjusting the pressure of the first drying tank and the second drying tank,
The control unit,
After the regeneration process is completed, the second drying tank subjected to the regeneration process is pressurized to achieve the same pressure as the first drying tank, and then the first drying tank and the second drying tank are switched.
The preprocessing unit,
An air header receiving compressed air produced by a plurality of compressors and supplying the compressed air toward the drying tank part;
A precooler for lowering the temperature of the compressed air supplied from the air header;
It includes a pre-filter for removing the foreign matter and condensate contained in the compressed air,
The post-processing unit,
An after-filter for removing foreign matters contained in the drying air dried and discharged in the drying tank part;
An aftercooler for lowering the temperature of the dry air,
The control unit,
By the manual method or the automatic method, the drying process and the regeneration process of the drying tank part are controlled to alternately proceed,
An air transfer pipe providing a transfer path of the compressed air until the compressed air introduced into the air header is discharged to the outside;
A three-way shuttle valve provided at the inlet side of the pair of drying tanks to selectively open and close under the control of the controller so that compressed air alternately flows into the first drying tank or the second drying tank;
A fuzz muffler which is operated during the pressurizing and regenerating process of the pair of drying tanks to switch between the dynamic pressure valve and the dynamic pressure control valve, and after the regeneration process is completed, the regenerated air discharged out of the drying tank is described later. A 2-way on / off valve configured to be discharged to the outside through the air;
A fuzz muffler which minimizes noise generated when the pair of drying tanks exhausts compressed air to achieve dynamic pressure and discharges regenerated air regenerated by a drying agent;
The dew point temperature of the inlet area of the first drying tank and the second drying tank is measured and transmitted to the control unit, so that when the control unit is lower than the dew point temperature set according to the type of desiccant, the amount of regenerated air is adjusted to be higher than the set dew point temperature. And dew point sensor to be controlled to be;
It further comprises an air filter for removing the foreign matter contained in the air dried through the first drying tank and the second drying tank in advance and then supplied to the after-treatment unit,
The control unit,
By controlling a plurality of control valves to control the movement direction of the pressure air and the operation of the pair of drying tanks,
The plurality of control valves include a first solenoid valve, a second solenoid valve, a third solenoid valve and a fourth solenoid valve,
The first solenoid valve is operated on / off to adjust the three-way shuttle valve for controlling the conveying direction of the compressed air to alternately transfer the compressed air to the first drying tank and the second drying tank,
The second solenoid valve is operated on / off so that the two-way on / off valve of the first drying tank is driven so that the two-way on / off valve is closed and the second drying tank is dried during the dynamic pressure. When the 2-way on / off valve is opened to allow regeneration air to be discharged to the fuzz muffler,
The third solenoid valve is operated on / off so that the two-way on / off valve on the side of the second drying tank is driven so that the two-way on / off valve is closed during dynamic pressure and the first drying tank is dried. During the process, it is opened so that regenerated air is discharged through the fuzz muffler,
The fourth solenoid valve is for driving the dynamic pressure valve, and the dynamic pressure valve is opened at the time of the dynamic pressure so that the first drying tank and the second drying tank have the same pressure at a given time, and the compressed air is discharged. Immediately closing the dynamic pressure valve,
In addition, the plurality of check valves provided in the drying tank unit,
A first check valve which prevents backflow and flows to the second drying tank when the dry air dried in the first drying tank passes;
A second check valve which prevents backflow and flows to the first drying tank when the dry air dried in the second drying tank passes;
And a third check valve and a fourth check valve for allowing regeneration air generated through the orifice to flow into the second drying tank and the first drying tank, respectively.
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