JP2013032733A - Catch tank apparatus for air dryer device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simple and inexpensive environmental-friendly catch tank apparatus for an air dryer device, configured to reduce ventilation resistance and maintain desired purge performance, while preventing unnecessary discharge of moisture or oil/dust.SOLUTION: The catch tank apparatus 100 for the air dryer device 10 separates moisture from purge air discharged during purging of the air dryer device to store it. The apparatus includes: a first chamber 110A which introduces the purge air discharged during purging of the air dryer device 10 via a purge air introduction passage 120, to collide with an inner wall for steam-water separation; a second chamber 110B which introduces the purge air subjected to the predetermined steam-water separation via a penetration part 131 of a first partition plate 130; an outside communication part 140 for discharging the purge air introduced to the second chamber 110B to the outside; and a reservoir tank 200 to which the moisture in the first chamber 110A is guided and stored.

Description

  The present invention is for an air dryer apparatus that separates and stores moisture, oil, dust, and the like from purge air during purge processing of the air dryer apparatus for removing moisture from service air used in service brakes, air suspensions, etc. in automobiles and the like. The present invention relates to a catch tank device.

For example, in large vehicles such as trucks and buses, air compressed to a predetermined pressure (for example, about 10 kgf / cm ² ) by an air compressor is stored in an air tank, and this compressed air (service air) is used as an operating power source. Service brake systems that are used as a part of the system and air suspension systems that use compressed air instead of coil springs and leaf springs are used.

Here, the air compressed by the air compressor is in a state where water is likely to be generated due to condensation of water vapor contained compared to the normal atmospheric pressure state.
In addition, there may be a case where lubricating oil for lubricating an air compressor including a crank mechanism and a piston that are rotationally driven by an engine is mixed in the compressed air.

  For this reason, if the air compressed by the air compressor is stored in the air tank as it is and the compressed air is supplied to various air systems such as a service brake system, corrosion or fouling occurs at the part where the compressed air comes into contact. As a result, there is a risk of adversely affecting the reliability of the system, for example, causing a malfunction in various air systems.

  For this reason, before the air compressed by the air compressor is stored in the air tank, it is dried by an air dryer device to remove oil and purify it.

As an example of such an air dryer device, there is one as described in Patent Document 1, for example, as shown in FIG. 7, when the air compressor 20 is in a load state where air is compressed (at the time of loading). Takes the compressed air into the air dryer device 10 from the inlet port 11, guides and passes the introduced compressed air to the filter 13 of the filter chamber 12, collects oil, dust, etc., and then guides it to the drying chamber 14. It is like that.
In the drying chamber 14, the moisture contained in the compressed air is absorbed and removed by the desiccant 15 accommodated in the drying chamber 14, and then the compressed air passes through the purge chamber 16 and the outlet 17 to the air tank 30. Has been led to.

On the other hand, when the pressure in the air tank 30 reaches a predetermined pressure (for example, about 10 kgf / cm ² ), the pressure regulator 40 operates and the air compressor 20 is brought into a no-load state (unload state) in which air is not compressed. However, in this state, the purge valve 18 is opened, and so-called purge processing is performed in which the compressed air in the purge chamber 16 is discharged to the outside while passing through the drying chamber 14 and the filter chamber 12.

  In addition, by this purging process, the moisture in the drying chamber 14 (the moisture adsorbed by the desiccant or the moisture accumulated in the bottom, etc.), the oil or dust in the filter chamber 12 (the oil collected in the filter 13, Dust and the like, and oil and dust collected at the bottom are discharged to the outside, and the desiccant 15 and the filter 13 are regenerated.

Japanese Utility Model Publication No. 5-26136 No. 7-8020 Japanese Utility Model Publication No. 6-76798 Japanese Utility Model Publication No. 7-10514

  By the way, when purge processing is performed to regenerate the desiccant 15 and the filter 13 using purge air at a predetermined pressure, moisture, oil, and the like accumulated in the air dryer device 10 are discharged from the drain 19 into the air and the ground along with the purge air. Since it is ejected toward the surface, there is a risk that the nearby wall or ground may be soiled, and it is desirable to prevent the moisture containing such oil from being inadvertently discharged to the outside.

  For this reason, in the air dryer device described in Patent Document 2 and Patent Document 3, purge air containing moisture and oil is guided to the drain tank, and the oil and moisture can be temporarily stored in the drain tank. As described above, the drain provided in the drain tank is released at an appropriate time and place, so that oil, moisture, and the like are not inadvertently discharged into the drain tank.

  Similarly, in the air dryer device described in Patent Document 4, purge air containing moisture and oil is guided to a casing (container), and the inside of the casing is partitioned by a partition plate provided with a plurality of small holes and a synthetic resin. By providing a fiber layer, a configuration is adopted in which only water that has been purified by collecting oil while purging sound is discharged to the outside together with purge air.

  However, a predetermined amount of purge air (for example, 4 L / second) needs to flow through the desiccant and the filter per unit time in order to regenerate the desiccant and the filter satisfactorily in the purge process. It is necessary to reduce the ventilation resistance of the drain tank. For this reason, in the air dryer apparatus described in Patent Document 2 or Patent Document 3 designed to have a relatively small ventilation resistance, the purge process is performed. Since the pressure of the purge air flowing into the drain tank is maintained at a relatively high level and is discharged to the outside with this high pressure, even if water and oil in the purge air can be temporarily stored in the drain tank. There is a risk that the purge air will be re-entrained and sprayed to the outside and discharged from the outlet.

  Moreover, in the air dryer apparatus described in Patent Document 4, even if the oil component can be removed, moisture is inadvertently discharged every time the purge process is performed, and the ventilation resistance of the casing may be increased. There is a possibility that it is difficult to obtain a desired purge performance.

  The present invention has been made in view of such a situation, and in spite of a simple and low-cost configuration, carelessly discharging moisture, oil, dust, etc. while maintaining desired purge performance with low airflow resistance. An object of the present invention is to provide a catch tank device for an air dryer device that has no adverse effects on the environment.

For this reason, the catch tank device for an air dryer device according to the present invention is:
A catch tank device for an air dryer device that collects and stores at least moisture from purge air discharged during a purge process of an air dryer device in an air system that stores and uses compressed air in an air tank,
A first chamber that introduces purge air discharged during the purge process of the air dryer device through the purge air introduction passage and collides the purge air ejected from the outlet portion of the purge air introduction passage with the inner wall to separate the air and water;
A second chamber that is disposed above the first chamber through the first partition plate and introduces purge air that has been subjected to air-water separation by the first chamber through the through-hole of the first partition plate;
An external communication part for discharging the purge air introduced into the second chamber to the outside;
A reservoir tank that is communicated with the first chamber via the communication path and that stores the moisture in the first chamber separated from the purge air by using the energy of the purge air;
It is characterized by comprising.

  In the present invention, the connection portion of the communication passage with the first chamber side is disposed near the bottom of the first chamber, and the connection portion of the communication passage with the reservoir tank side is connected with the first chamber side. It can be characterized by being arranged at a position higher in the vertical direction than the portion.

  In the present invention, an open / close valve is provided in the external communication portion, and when the purge process of the air dryer device is performed, the valve is opened for a predetermined period and is closed after a predetermined period has elapsed. .

  In the present invention, the predetermined period is a few seconds after the purge process of the air dryer apparatus is started, and the on-off valve is closed while the purge process of the air dryer apparatus is continued.

  According to the present invention, while having a simple and low-cost configuration, the ventilation resistance is small and the desired purge performance is maintained, and there is no adverse effect on the environment without inadvertently discharging moisture, oil or dust. It is possible to provide a catch tank device for an air dryer device with few.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole block diagram which shows schematically the whole structure of the air dryer system provided with the catch tank apparatus for air dryer apparatuses which concerns on Example 1 of embodiment of this invention. It is sectional drawing which expanded and showed the catch tank apparatus for air dryer apparatuses which concern on Example 1 same as the above. It is the perspective view which looked at the catch tank device for air dryers concerning Example 1 same as the above (an example in case catch tank 110 is transparent) from the slanting upper part. It is a figure which shows a mode that the moisture etc. of the catch tank apparatus for air dryer apparatuses which concern on Example 1 same as the above are sent to a reservoir tank. It is sectional drawing which shows the catch tank apparatus (opening state of an on-off valve) for the air dryer apparatus which concerns on Example 2 of embodiment of this invention. It is a figure which shows a mode that the moisture tank etc. of the catch tank apparatus for air dryer apparatuses (closed state of an on-off valve) which concerns on Example 2 same as the above are sent to the reservoir tank. It is a whole block diagram for demonstrating the structural example of the conventional air dryer system.

  Hereinafter, an embodiment of a catch tank device for an air dryer device according to the present invention will be described with reference to the accompanying drawings. In addition, this invention is not limited by embodiment described below.

As shown in FIG. 1, the catch tank device 100 for an air dryer device according to Example 1 of the present embodiment includes purge air (including moisture, oil, dust, etc.) discharged from the drain 19 of the air dryer device 10 during the purge process. For example, a pressure of about 10 kgf / cm ² and a unit time flow rate of about 4 L / second) are introduced into the inside through the inlet pipe 120. In addition, the description which abbreviate | omits the same element as the element already demonstrated is attached | subjected, and the description is abbreviate | omitted.

  2 is an enlarged cross-sectional view of the air dryer apparatus catch tank device 100 shown in FIG. 1, and FIG. 3 shows the air dryer apparatus catch tank device 100 (an example in which the catch tank 110 is transparent). It is the perspective view seen from diagonally upward.

  As shown in FIGS. 1 to 3, the inlet pipe 120 functioning as a purge air introduction passage is configured by a tubular member having a predetermined length, and an inlet end 120A is disposed on the upper side of the catch tank 100 for the air dryer device, and is disposed inside. The partition of the catch tank 110 having a space extends through the partition plate (first partition plate) 130 that vertically defines the catch tank 110 into the first chamber 110A and the second chamber 110B. The outlet end 120 </ b> B is arranged below the plate 130.

  A drain 19 of the air dryer apparatus 10 is connected to the inlet end 120A of the inlet pipe 120 via a resin hose or the like.

  Near the outlet end 120 </ b> B of the inlet pipe 120, a cap-shaped member 121 is placed on the outer periphery of the inlet pipe 120.

  The cap-shaped member 121 can be configured by a tubular member having one end closed and the other end open, and the open end is fixed by inserting the outlet end 120B of the inlet pipe 120. ing.

  Note that the bottom of the cap-shaped member 121 and the outlet end 120B of the inlet pipe 120 are attached with a predetermined gap, and the predetermined gap is located on the side of the cap-shaped member 121 (the longitudinal direction of the inlet pipe 120). A plurality of discharge holes (nozzles) 122 extending along a substantially orthogonal direction or a direction intersecting at a predetermined angle are opened. Note that the number, size, shape, layout, and the like of the discharge holes 122 can be changed as appropriate.

  Further, as shown in FIGS. 2 and 3, the partition plate 130 is provided with a plurality of through holes (penetrating portions) 131 for communicating the first chamber 110 </ b> A and the second chamber 110 </ b> B. Note that the number, size, shape, layout, and the like of the through holes 131 can be changed as appropriate.

  The second chamber 110B is provided with an external communication pipe (external communication portion) 140 that communicates the second chamber 110B with the outside. In FIG. 1 to FIG. 3, in order to obtain a labyrinth effect, one end of the external communication pipe 140 protrudes inward of the second chamber 110 </ b> B, and the external communication pipe 140 is connected to the through hole 131 of the partition plate 130. It extends in a direction intersecting with the penetration direction (a substantially orthogonal direction is illustrated in FIGS. 1 to 3). 1 and 3, one external communication pipe 140 is provided, but the number, size, shape, layout, and the like of the external communication pipe 140 can be changed as appropriate.

  In the air dryer apparatus catch tank device 100 having the above-described configuration, from the purge air (including moisture, oil, dust, etc.) discharged during the purge process from the drain 19 of the air dryer apparatus 10 as follows. By separating moisture, oil, dust, etc., only purge air that does not contain moisture, oil, dust, etc. can be discharged to the outside.

  That is, the entire amount of purge air (including moisture, oil and dust) discharged from the drain 19 of the air dryer device 10 during the purge process is introduced into the air dryer device catch tank 100 via the inlet pipe 120. First, purge air flows from the inlet end 120A of the inlet pipe 120 toward the outlet end 120B.

  When the purge air guided to the outlet end 120 </ b> B exits from the outlet end 120 </ b> B, the direction of flow is controlled by the cap-shaped member 121, and the cross-section is substantially cylindrical via a discharge hole (nozzle) 122 provided in the cap-shaped member 121. Are injected in the radial direction with respect to the center axis of the inlet pipe 120 and the catch tank 110 and guided to the first chamber 110 </ b> A in the catch tank 110.

The purge air ejected vigorously through the discharge hole (nozzle) 122 collides with the inner wall (inner side wall) of the first chamber 110A, so that moisture, oil, dust, etc. contained in the purge air are discharged into the first chamber. Attached to the inner wall (inner side wall) of 110A, moisture, oil, dust, and the like are separated from the purge air (purge air containing moisture, oil, dust, etc. is separated from the air).
Water, oil, dust, etc. separated from the purge air are collected at the bottom of the first chamber 110A.

  Thereafter, only the purge air in the first chamber 110 </ b> A that has been separated from the steam is guided to the second chamber 110 </ b> B in the catch tank 110 through the through hole 131 provided in the partition plate 130.

  The purge air guided to the second chamber 110B is discharged to the outside through the external communication pipe 140 that connects the second chamber 110B and the outside.

  Since the purge air guided to the second chamber 110B passes through the through hole 131 and has an upward flow in FIGS. 1 to 3, the external communication pipe 140 is in a direction intersecting with the purge air flow direction ( In FIG. 1 to FIG. 3, the purge air is prevented from flowing directly into the external communication pipe 140 by extending in a substantially orthogonal direction (labyrinth effect).

  That is, even when the purge air contains moisture, oil, dust, etc. that could not be separated in the first chamber 110A, the purge air collides with the outer wall of the external communication pipe 140 or the inner wall of the second chamber 110B. By colliding, moisture, oil, dust, and the like can be separated from the purge air, and the purge air can be discharged to the outside through the external communication pipe 140 after the air-water separation.

  After the purge process, moisture, oil, dust, etc. separated from the purge air in the second chamber 110B are guided to the first chamber 110A through the through holes 131 of the partition plate 130 by natural dropping or the like, and the first It is joined to moisture, oil, dust, etc. stored at the bottom of the chamber 110A.

  By the way, as shown in FIGS. 1 and 2, in the present embodiment, a communication path 210 communicating with the reservoir tank 200 is connected near the bottom of the first chamber 110 </ b> A. The communication path 210 can include a hose or a pipe (for example, a flexible resin or metal).

  Therefore, in the first embodiment, as shown in FIG. 4, moisture, oil, dust, etc., separated from the purge air and collected at the bottom of the first chamber 110A by the purge air energy (pressure difference) during the purge process, etc. Is pushed out and delivered to the reservoir tank 200 via the communication path 210.

  Accordingly, during the purge process, moisture, oil, dust, etc. separated from the purge air and collected at the bottom of the first chamber 110A are re-entrained in the purge air, moved to the second chamber 110B side, and discharged to the outside. Such a risk can be reliably suppressed.

  In addition, since the moisture, oil, and dust collected at the bottom of the first chamber 110A can be moved to the reservoir tank 200 using the energy (pressure difference) of the purge air, the inlet portion (communication path) of the reservoir tank 200 can be moved. 210 can be installed at a position higher than the vicinity of the bottom of the first chamber 110A (the connection part 210A of the communication path 210), for example, the reservoir tank 200 to a place with excellent maintainability, for example. Can be installed, and it is easy to secure the ground height, which is advantageous in terms of mounting layout.

  However, the inlet portion of the reservoir tank 200 (the connecting portion 210B of the communication passage 210) can be installed at a position equal to or lower than the vicinity of the bottom of the first chamber 110A (the connecting portion 210A of the communication passage 210).

  The catch tank 110 and the reservoir tank 200 can be transparent containers so that the amount of collected water, oil, dust, etc. can be confirmed, and these can be easily discharged. In addition, a drain cock or the like can be provided, and water, oil, dust, and the like stored in the bottom of the first chamber 110A and the reservoir tank 200 can be discharged at an appropriate place and timing as in the conventional case. Since water, oil, dust and the like are not inadvertently discharged every time the purge process is performed, the risk of soiling nearby walls and ground can be suppressed.

  As described above, according to the catch tank device 100 for an air dryer apparatus according to the first embodiment, the first chamber 110A that introduces purge air that is discharged during the purge process of the air dryer apparatus 10 and collides with the inner wall to achieve air-water separation. And the purge air that is disposed above the first chamber 110A via the partition plate 130 and has been subjected to predetermined air-water separation by the first chamber 110A while suppressing re-entrainment of moisture, oil, dust, etc. A second chamber 110B introduced through the through-hole 131 of the plate 130, and an external communication pipe 140 extending in a direction intersecting with the flow direction of the purge air introduced into the second chamber 110B (eg, a direction substantially orthogonal) , And communicates with the vicinity of the bottom of the first chamber 110A through the communication passage 210 and accommodates moisture, oil, dust, etc. separated from the purge air by the first chamber 110A. The reservoir tank 200 is configured so that, even if water or oil in the purge air can be temporarily stored in the drain tank as in the conventional case, the purge air is re-entrained and sprayed to form a spray state. Purge air can be efficiently separated into air and water during the purge process while reliably preventing the possibility of being discharged to the outside, thus inadvertently discharging moisture, oil, dust, etc. Therefore, it is possible to provide a catch tank device for an air dryer device that is free from contamination and is advantageous to the environment.

  Further, according to the catch tank device 100 for an air dryer device according to the present embodiment, the ventilation resistance of the purge air can be kept low, so that a desired purge performance can be obtained.

  That is, according to the catch tank device 100 for an air dryer device according to the present embodiment, the moisture resistance, oil content, and dust are inadvertently maintained while maintaining a desired purge performance while maintaining a desired purge performance with a simple and low-cost configuration. Therefore, it is possible to provide a catch tank device for an air dryer device that does not discharge the air and the like and has little adverse effect on the environment.

  The reservoir tank 200 may be provided with an outside air communication unit 220, a pressure adjustment valve for adjusting the internal pressure, and the like.

  As in the case of the first embodiment, the catch tank device 300 for the air dryer device according to the second embodiment of the present embodiment is purged air (moisture, oil, dust, etc.) discharged from the drain 19 of the air dryer device 10 during the purge process. Are introduced into the interior through the inlet pipe 120. In addition, the description about the already demonstrated code | symbol is abbreviate | omitted as attaching | subjecting the same code | symbol to the same element.

  As shown in FIG. 5, the catch tank device 300 for an air dryer device according to the second embodiment is provided with an opening / closing valve 400 in the external communication pipe 140 with respect to the catch tank device 100 for the air dryer device of the first embodiment. .

  The on-off valve 400 is normally energized to close by, for example, an elastic element (spring or the like), and is electromagnetically driven according to a valve opening signal from a control device (not shown), and is opened for a certain time (for example, about 2 seconds). It is configured to be valved.

  In the catch tank device 300 for an air dryer apparatus according to the second embodiment configured with the on-off valve 400, a valve opening signal is sent in response to a purge processing start signal of the air dryer apparatus 10, and the purge of the air dryer apparatus 10 is performed. The on-off valve 400 is opened for a predetermined period during processing (for example, about 2 seconds).

  Thereby, also in the catch tank device 300 for an air dryer device according to the second embodiment, as in the first embodiment, during the period during which the air dryer device 10 is purged (for example, about 2 seconds), by the first chamber 110A, The purge air discharged during the purge process of the air dryer device 10 can be introduced and collided with the inner wall to achieve air / water separation, and the second air disposed above the first chamber 110A via the partition plate 130. Only the purge air is efficiently passed through the external communication pipe 140 and the opening / closing valve 400 while suppressing the re-entrainment of moisture, oil, dust and the like in the first chamber 110A by the chamber 110B. It can be discharged well.

  In addition, since the opening / closing valve 400 is closed after the lapse of a predetermined period, the purge process of the air dryer device 10 is continued. Therefore, as shown in FIG. Due to the pressure difference, moisture, oil, dust, etc. accumulated at the bottom of the first chamber 110 </ b> A are pushed out and delivered to the reservoir tank 200 via the communication path 210.

  Accordingly, during the purge process, moisture, oil, dust, etc. separated from the purge air and collected at the bottom of the first chamber 110A are re-entrained in the purge air, moved to the second chamber 110B side, and discharged to the outside. Such a risk can be reliably suppressed.

  In addition, since the moisture, oil, and dust collected at the bottom of the first chamber 110A can be moved to the reservoir tank 200 using the energy (pressure difference) of the purge air, the inlet portion (communication path) of the reservoir tank 200 can be moved. 210 can be installed at a position higher than the vicinity of the bottom of the first chamber 110A (the connection part 210A of the communication path 210), for example, the reservoir tank 200 to a place with excellent maintainability, for example. Can be installed, and it is easy to secure the ground height, which is advantageous in terms of mounting layout.

  However, the inlet portion of the reservoir tank 200 (the connecting portion 210B of the communication passage 210) can be installed at a position equal to or lower than the vicinity of the bottom of the first chamber 110A (the connecting portion 210A of the communication passage 210).

  As described above, in the catch tank device 300 for an air dryer apparatus according to the second embodiment, the same operational effects as those of the first embodiment can be obtained, and a predetermined period during the purge process of the air dryer apparatus 10 (for example, during the purge process) (For about 2 seconds from the start of the purging process), by opening the on-off valve 400, it is possible to separate water, oil, dust, etc. from the purge air well, and the separated water, oil, dust, etc. Since only the purge air can be efficiently discharged through the external communication pipe 140 and the opening / closing valve 400 while suppressing re-entrainment of the valve, the opening / closing valve 400 is closed after the predetermined period has elapsed. During the purging process, moisture, oil, dust, etc. accumulated in the bottom of the first chamber 110A due to the energy (pressure difference) of the purge air are passed through the communication passage 210. Since it can be sent to the reservoir tank 200, the purge air stored at the bottom of the first chamber 110A, for example, at the start of the next purge process, moisture, oil, dust, etc. are caught in the purge air and discharged to the outside. It is possible to more reliably suppress such a risk.

  Incidentally, the catch tank 110 and the reservoir tank 200 according to each of the above-described embodiments are manufactured from, for example, a transparent material so that the amount of collected water, oil, dust, and the like can be easily confirmed. In addition, a drain cock can be provided so that the collected water, oil, dust, etc. can be easily discarded. For example, the catch tank 110 and the reservoir tank 200 can be easily attached to and detached from the vehicle or the like. As possible, it can be configured such that the collected water, oil, dust, etc. can be easily discarded by removing it upside down by an operator or user.

  The embodiment described above is merely an example for explaining the present invention, and various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Air dryer apparatus 12 Filter chamber 13 Filter 14 Drying chamber 15 Desiccant 16 Purge chamber 19 Drain 20 Air compressor 30 Air tank 100 Catch tank device for air dryer device 110 Catch tank 110A 1st chamber 110B 2nd chamber 110C 3rd chamber 120 Inlet pipe ( Purge air introduction passage)
120A Inlet end 120B Outlet end 121 Cap-shaped member 122 Discharge hole (nozzle)
130 partition plate (equivalent to the first partition plate)
131 Through hole (through part)
140 External communication pipe (external communication section)
200 Reservoir tank 210 Communication path 220 External communication part 300 Catch tank device for an air dryer device (Example 2)
400 On-off valve

Claims (4)

A catch tank device for an air dryer device that collects and stores at least moisture from purge air discharged during a purge process of an air dryer device in an air system that stores and uses compressed air in an air tank,
A first chamber that introduces purge air discharged during the purge process of the air dryer device through the purge air introduction passage and collides the purge air ejected from the outlet portion of the purge air introduction passage with the inner wall to separate the air and water;
A second chamber that is disposed above the first chamber through the first partition plate and introduces purge air that has been subjected to air-water separation by the first chamber through the through-hole of the first partition plate;
An external communication part for discharging the purge air introduced into the second chamber to the outside;
A reservoir tank that is communicated with the first chamber via the communication path and that stores the moisture in the first chamber separated from the purge air by using the energy of the purge air;
A catch tank device for an air dryer device, comprising:   The connection portion of the communication passage with the first chamber side is disposed near the bottom of the first chamber, and the connection portion of the communication passage with the reservoir tank side is in the vertical direction from the connection portion with the first chamber side. The catch tank device for an air dryer device according to claim 1, wherein the catch tank device is disposed at a high position.   3. An on-off valve is provided in the external communication portion, and when the purge process of the air dryer device is being performed, the valve is opened for a predetermined period and is closed after a predetermined period has elapsed. A catch tank device for an air dryer device as described in 1.   The catch tank device for an air dryer device according to claim 3, wherein the predetermined period is a few seconds after the purge processing of the air dryer device is started, and the on-off valve is closed while the purge processing of the air dryer device is continued.

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