KR102497198B1 - Air dryer cartridge for commercial vehicle - Google Patents

Abstract

The present invention relates to an air dryer cartridge, capable of improving a filtering function of oil and the like and extending a life of an air dryer by maximizing a volume of a pre-filter capable of filtering the oil and other foreign substances contained in compressed air. According to the present invention, a pre-filter structure is divided into regions, and the filter regions are separately activated according to a compressed air supply mode and a regeneration mode according to the divided regions. Accordingly, oil filtering efficiency and regeneration efficiency can be improved. The air dryer cartridge of the present invention comprises: a cartridge container; a housing; a base unit; a pre-filter; and a pre-filter holder.

Description

Air dryer cartridge for commercial vehicles {AIR DRYER CARTRIDGE FOR COMMERCIAL VEHICLE}

The present invention relates to a dryer cartridge applied to a compressed air treatment system, and more particularly, to an air dryer cartridge applied to a compressed air treatment system for commercial vehicles.

In commercial vehicles, various operating systems using pneumatic pressure are provided to control the operation of large and heavy commercial vehicles. Examples of such pneumatic systems include service brake systems, pneumatic suspension systems, parking brake systems, and the like. To drive these pneumatic systems, high-pressure compressed air is required, and this compressed air is generated through a compressor driven by an engine or drive motor and then delivered to the reservoirs of the respective compressed air consuming systems.

On the other hand, the compressed air supplied through the compressor contains foreign substances including oil and moisture. Foreign substances such as oil and moisture in the compressed air have a negative effect on the system, such as causing failure of the pneumatic system or reducing durability. do.

Therefore, in a system for generating and supplying compressed air, a dryer unit including a filter cartridge is provided to filter foreign substances such as oil from the generated compressed air and absorb moisture to produce dry air.

1 shows an example of a compressed air treatment system in which a conventional dryer unit is installed.

As shown in FIG. 1 , oil and moisture are removed from the high-pressure compressed air generated by the compressor 10 while passing through the dryer unit 20 . In particular, compressed air introduced into the dryer unit 20 is treated while passing through the filter cartridge 21, and the treated compressed air is supplied to each consumption circuit side through the valve assembly 22.

On the other hand, when the dehumidifying agent in the dryer unit reaches saturation or the like does not exhibit sufficient dehumidifying performance, a regeneration process may be performed to recover the performance of the dehumidifying agent by returning the dried compressed air to the dryer unit. In this case, the compressed air flow shows a flow in generally the opposite direction to that at the time of supply.

In the compressed air treatment system, contaminant particles already contained in intake air as well as oil and carbon black particles introduced into the compressed air from the compressor during the compression process are removed from the compressed air, and moisture present in the compressed air is removed. To this end, the compressed air treatment system of commercial vehicles is usually provided with an air dryer cartridge that dehumidifies the compressed air and preferably also absorbs oil and contaminant particles.

In this regard, Korean Patent Publication No. 10-2018-0118715 and Korean Patent Registration No. 10-2079405 show examples of conventional air dryer cartridges.

In such a conventional dryer cartridge, a cup-shaped body portion is formed to accommodate a dehumidifying agent, and a form of stacking a plurality of oil absorbent papers on the bottom of the body portion or fixing the oil absorbent paper to the outer lower portion of the body portion was utilized

On the other hand, in the case of a structure in which oil absorbent paper is laminated on the bottom surface of the body part, the sucked air first passes through the desiccant and then through the oil absorbent paper, so that the oil of the air generated from the compressor is not filtered and covers the surface of the desiccant. As a result, there is a problem in that the dehumidifying performance of the dehumidifying agent is deteriorated.

In addition, in the case of the structure in which the oil absorber is fixed to the outer lower portion of the body, as the air dryer is used for a long time, oil is accumulated on the oil absorber installed in a narrow space, resulting in a problem in that the performance of the air dryer deteriorates.

Korean Patent Publication No. 10-2018-0118715 (2018. 10. 31.) Korean Patent Registration No. 10-2079405 (2020. 02. 13.)

The present invention has been made to solve the above problems, and in the present invention, the volume of the pre-filter capable of filtering oil and other foreign substances contained in compressed air is maximized to improve the filtering function of oil, etc. Its purpose is to provide an air dryer cartridge capable of extending its life.

In particular, in the present invention, by dividing the pre-filter structure into regions and presenting the possibility of differentiated utilization in the compressed air supply mode and the compressed air regeneration mode according to the divided regions, the filtering efficiency in the compressed air supply mode and the regeneration mode Another objective is to improve the regeneration efficiency in

In order to achieve the above object, in a preferred embodiment of the present invention, an air dryer cartridge for a compressed air treatment system of a commercial vehicle is provided, comprising: a cartridge container in which a desiccant is accommodated in an internal space; a housing for accommodating the cartridge container; a base portion configured to close the open surface of the housing and having an inlet port and an outlet port so that air can move into the housing; And a pre-filter installed in the cartridge container; includes,

The cartridge container includes a filter mounting portion for mounting the pre-filter on its outer circumferential surface; A first flange formed at an upper end of the filter mounting portion and protruding in a radial direction outside the cartridge container; And it is formed on the lower end of the filter mounting portion, a second flange protruding in the outer radial direction of the cartridge container; may include.

In addition, the height of the filter mounting portion corresponding to the height between the lower surface of the first flange and the upper surface of the second flange is the height of the cartridge body corresponding to the height between the upper surface of the first flange and the lower surface of the second flange. It may be formed in the range of 70% or more to 90% or less of.

A pre-filter holder installed while surrounding an outer surface of the pre-filter to prevent separation of the pre-filter, wherein the pre-filter is divided into an upper first filter region and a lower second filter region, The pre-filter holder includes a ring-shaped filter dividing gasket separating the first filter area and the second filter area; and an annular air flap portion configured to block a gap between the cartridge container and the housing according to air flow.

The filter mounting portion is positioned between the first filter area and the second filter area and includes a first horizontal band portion having a groove formed toward the pre-filter holder, wherein the pre-filter holder comprises the first horizontal band portion. and a second transverse band portion having a groove formed toward the pre-filter, and the filter dividing gasket may be inserted and fixed into the groove of the first transverse band portion and the groove of the second transverse band portion. .

The air flap part is mounted on the outer circumferential surface of the pre-filter holder, extends from the pre-filter holder toward the housing, and is made of an elastic body having a structure oriented upward, and the air flap part is spaced apart from the housing in a normal state. And, according to the air flow direction in the gap, an upper-oriented outer end of the air flap part may be configured to selectively block air movement while contacting the inner wall of the housing.

An average pore size of filter members in the first filter region may be smaller than an average pore size of filter members in the second filter region.

The housing may further include a ring-shaped stopper protruding at a predetermined height along an inner circumferential surface of the inner wall, and may be supported by the stopper when an outer end of the air flap unit descends.

According to the present invention, there is an effect of improving the cleaning effect of compressed air by filtering moisture, oil, and foreign substances contained in compressed air in multiple stages inside the cartridge.

In particular, according to the present invention, the filtering efficiency of the pre-filter is improved by maximizing the volume of the pre-filter capable of filtering oil and other foreign substances contained in compressed air, and the durability of the pre-filter is extended to make the air dryer unit more efficient. It has an effect that can be used for a long time.

In addition, according to a preferred embodiment of the present invention, while providing a pre-filter structure divided into two, more purified air can be supplied to the compressed air storage system by effectively guiding the flow of compressed air for each mode for each divided filter area. In addition, there is an effect of improving the drying efficiency of the desiccant during regeneration and reducing the consumption of compressed air in which the stored compressed air is discharged to the outside.

1 shows an example of a compressed air treatment system in which a conventional dryer unit is installed.
Figure 2 shows a cross-section of a cartridge for an air dryer according to a preferred embodiment of the present invention.
3A shows an example of a cartridge body of a cartridge for an air dryer according to a preferred embodiment of the present invention, and FIG. 3B shows an example of a pre-filter holder for fixing a pre-filter.
4 conceptually illustrates air flow in a supply mode and a regeneration mode in a compressed air treatment system including a cartridge for an air dryer according to a preferred embodiment of the present invention.
Figure 5 shows a cross-section of a cartridge for an air dryer according to another preferred embodiment of the present invention,
FIG. 6A shows an operating state of the cartridge in the compressed air supply mode in area 'A' in the example of FIG. 5, and FIG. 6B shows an operating state of the cartridge in area 'A' in the regeneration mode.
FIG. 7a shows the cartridge operation state and air flow in the compressed air supply mode in the example d of FIG. 5, and FIG. 7b shows the cartridge operation state and air flow in the regeneration mode.
Figure 8 shows a portion of an air dryer cartridge in another preferred embodiment of the present invention, including a stopper in the housing.

The embodiments described below are only intended to be described in detail so that those skilled in the art can easily practice the invention, which does not mean that the scope of protection of the present invention is limited. don't Therefore, substitution or change of some elements may be made without departing from the essential scope of the present invention.

In the following description, when a part is said to be 'connected' to another part, this includes not only the case where it is directly connected but also the case where it is connected with another element or device in between. In addition, when a part 'includes' a certain component, it means that it may further include other components, not excluding other components unless otherwise stated.

Like conventional dryer cartridges, the air dryer cartridge described herein is configured to remove oil in compressed air, dry compressed air, and supply the compressed air in one direction, while supplying compressed air to regenerate the cartridge according to certain conditions. It means that it is configured to perform the process of flowing in the opposite direction and then discharging to the atmosphere.

To this end, the air dryer cartridge according to the present invention is also configured to include an inlet port through which compressed air is introduced and a discharge port through which compressed air is discharged. It is a concept that is relatively determined according to the operating state and is related to the flow direction of compressed air. However, in this specification, for convenience of description, 'inflow' and 'outflow' are defined based on a state in which compressed air is supplied, that is, a state in which air generated by a compressor flows into the air dryer cartridge and then flows out toward the valve assembly. Explain. For reference, since air flows in the opposite direction inside the cartridge during regeneration, it is known that 'inflow' and 'outflow' are opposite to those when compressed air is supplied to those skilled in the art. If so, you will be able to fully understand.

In addition, in the present specification, compressed air being 'treated' means that oil, moisture, and foreign substances in the compressed air are filtered while the compressed air passes through the filter cartridge.

Hereinafter, an air dryer cartridge according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

Figure 2 shows a cross-section of an air dryer cartridge according to a preferred embodiment of the present invention, Figures 3a and 3b is a perspective view of its main configuration, Figure 3a shows an example of a cartridge body, Figure 3b An example of a pre-filter holder for fixing a pre-filter is shown.

The air dryer cartridge 100 according to a preferred embodiment of the present invention is substantially rotationally symmetrical with respect to a central axis in a vertical direction, and a cartridge container 120 filled with a desiccant 140 inside a substantially cylindrical housing 110 has a stored form. As shown in FIG. 2 , the cylindrical housing 110 has a structure having an open surface with one end open, and the opposite end has a closed shape. For example, the housing 110 may have a cup shape manufactured by deep drawing a thin metal plate.

A cartridge container 120 filled with a desiccant 140 is located inside the housing 110 . The desiccant 140 filled in the cartridge container 120 may be a powdery desiccant having a dehumidifying function, such as zeolite, or may be a structure impregnated with the desiccant. The desiccant 140 is filled in the inner space of the cartridge container 120, and the density of the desiccant 140 can be sufficiently increased as the cartridge container 120 is pressed by the spring member 170 at the top. .

In the case of the example of Figure 2, the spring member 170 is located on top of the housing 110, it may be made of a top-down structure for pressing the cartridge container 120 downward.

The cartridge container 120 refers to the entire container for accommodating the desiccant 140, and as in the example of FIG. 2, the cartridge container 120 includes a substantially cylindrical cartridge body and a cartridge covering the opening of the cartridge body 121. A cover 122 may be included. The cartridge cover 122 functions as a lid that prevents the desiccant 140 from being discharged to the outside, and has an outlet port 144 at the center so that compressed air passing through the desiccant 140 inside the cartridge container 120 can be discharged. can be formed.

The cartridge body 121 may include a desiccant accommodating portion forming a cup-shaped inner space, and a plurality of ribs extending radially along an outer circumference of the desiccant accommodating portion. As shown in FIG. 3A, these ribs may be radially formed on the outer circumference of the desiccant accommodating part at regular intervals, and a channel through which compressed air can move is formed between the spaced apart spaces of the ribs. Accordingly, the compressed air introduced from the inlet port 143 may move toward the desiccant through the channel between the radial ribs.

The ribs of the cartridge body 121 may have a generally triangular cross-sectional shape that becomes narrower from bottom to top as in FIGS. 2 and 3A. Since the shape of the radial rib is related to the inner shape of the desiccant accommodating portion, the inner diameter of the upper desiccant accommodating portion of the cartridge body 121 may be formed larger by the structure in which the width of the upper side of the rib is narrowed. Through this, it is possible to sufficiently increase the internal volume of the cartridge container in which the desiccant is accommodated while sufficiently securing an air passage from the lower inlet port 143 side.

However, the structure of the cartridge body 121 including such a rib structure is only one example, and the air dryer cartridge according to the present invention is not limited to the cartridge body including the illustrated rib structure.

In addition, as shown in FIG. 3A, a filter mounting portion 1230 for mounting a pre-filter 150 to be described later is installed radially outside the rib of the cartridge body 121. The filter mounting portion 1230 may be configured as a cylindrical support having a plurality of air passages through which air can communicate.

At the lower end of the cartridge container 120, a base portion 130 for fixing the cartridge container 120 therein while being coupled with the housing 110 is installed. Therefore, the base part 130 is located on the side of the open surface of the housing 110, and the base part 130 functions as a cover for the open surface of the housing 110. The base part 130 partially closes the open surface of the housing 110. Here, partially closing the open surface of the housing 110 means an inlet port 143 for moving air into and out of the housing 110. It means that the movement of the fluid is restricted in the remaining area of the base part 130 except for the outlet port 144. Therefore, the base portion 130 is completely sealed so that fluid cannot flow into the housing 110 except for the inlet port 143 and the outlet port 144 .

Regarding the base part 130, according to a preferred embodiment of the present invention, the base part 130, as shown in FIG. 2, is a reinforcing plate 131 for structurally reinforcing the bottom of the air dryer cartridge 100 And, it may be composed of a seaming cap 132 that supports the reinforcing plate 131 under the reinforcing plate 131 and is fastened to the end of the housing 110 through a flanged seam method. Meanwhile, unlike the fastening structure of the flange-type seam method, the base portion 130 may be completely fixed to the housing 110 through welding or the like.

Since the air dryer cartridge 100 must be mounted directly on the valve assembly of the air handling system, the air dryer cartridge 100 may be provided with a fastening structure for mounting to the air handling system. To this end, the base part 130 may include a fastening structure to be directly mounted on the valve assembly of the air treatment system, and preferably, a screw thread is formed around the outlet port 144 in the center of the reinforcing plate 131. It may be configured to be screwed with the neck portion of the inlet side of the valve assembly.

In addition, at least one inlet port 143 may be formed around the central outlet 146 in the reinforcing plate 131, and one side flange of the seaming cap may be inserted and fixed into the inlet port 143. there is. At this time, a first gasket 133, which is an external airtight member for maintaining airtightness of the compressed air, may be installed outside the seaming cap, that is, toward the valve assembly. The upper portion of the first gasket 133 is inserted into and fixed to the concave-convex portion of the seaming cap 132, and may form a protruding portion protruding toward the central axis of the cartridge from the outside of the concave-convex portion of the seaming cap 132. Through this, when the cartridge is coupled to a valve housing (not shown) located below the air dryer cartridge, the sealing force according to the internal pressure can be improved by the cross-sectional structure of the annular gasket 133.

In addition, a second gasket 134 which is an inner gasket for forming an airtight seal between the base portion and the cartridge container inside the air dryer cartridge and an O-ring 135 near the neck portion may be included.

In order to sufficiently secure airtightness on the compressed air flow path inside the housing 110, sealing members such as O-rings and grooves in which they are inserted and fixed may be formed between the separated components.

On the other hand, the cartridge container 120 may be formed of a concentric cylindrical structure with the cylindrical housing 110, and thus may form a gap 145 between the cylindrical housing and the. This gap may function as a passage through which compressed air passing through the pre-filter 150, which will be described later, moves toward the desiccant in the cartridge container.

In addition, the air dryer cartridge according to a preferred embodiment of the present invention may be provided with a pre-filter 150 for primarily filtering foreign substances such as oil. The pre-filter 150 in the present invention may be a filter member installed on the upstream side of the desiccant, that is, before the compressed air reaches the desiccant stored in the cartridge container 120, based on the compressed air supply mode. there is.

The pre-filter 150 is for adsorbing and removing oil contained in compressed air, and may be, for example, an oil absorption paper made of a porous material or a non-woven material. However, the pre-filter 150 is not limited to the one exemplified above, and during the compressed air treatment process, as long as it can pre-filter the compressed air before the compressed air is introduced into the desiccant 140, it can be used without limitation. .

According to one embodiment of the present invention, the pre-filter 150 may be composed of oil adsorption paper attached and fixed by a wrapping method, and the pre-filter holder 160 can prevent the oil adsorption paper from escaping in the radial direction of the dryer cartridge. ) can be installed.

The pre-filter holder 160 may be installed while surrounding the outer surface of the pre-filter 150 and may have a thin cylindrical structure having a plurality of air passages 1603 through which air may pass. As shown in FIGS. 2 and 3B , it may be a lattice frame having a cylindrical structure in which an air passage 1603 is formed by combining a horizontal body portion 1601 and a vertical body portion 1602 extending in horizontal and vertical directions, respectively.

In addition, the pre-filter holder 160 may have a structure with one side cut in a vertical direction so that it can be assembled while surrounding the pre-filter, and a structure including a fastening means that can be assembled and fixed to the pre-filter at the cut end. can be Therefore, during assembly, in a state where the cut end is opened and the pre-filter holder 160 is positioned on the outer surface of the pre-filter 150, the cut end is closed by the fastening means to place the pre-filter on the outer surface of the pre-filter 150. The holder 160 may be configured to be assembled.

Referring to FIG. 2 , the pre-filter 150 may have a ring-shaped structure installed along the outer circumference of the cartridge container 120, and preferably may be installed along a wide area of the outer surface of the cartridge container.

The reason why the pre-filter is installed along the wide area of the outer surface of the cartridge container is to maximize the oil removal performance by increasing the volume of the pre-filter by sufficiently utilizing the area of the outer surface of the cartridge container.

The volume of the pre-filter 150 can be defined by the area of the area where the pre-filter is installed and the thickness of the pre-filter. It is formed to fully utilize the height.

In this regard, in the air dryer cartridge according to a preferred embodiment of the present invention, in the outer surface structure of the cartridge body 121 constituting the cartridge container, a pair of upper and lower flange portions of the cartridge body 121 are formed, A filter mounting portion 1230 providing a region in which a pre-filter can be installed may be formed on an outer circumferential surface between the flange portions.

In particular, the first flange 1210 of the upper portion of the cartridge body 121 and the second flange 1220 of the lower portion of the cartridge body 121 protrude outward toward the radial direction of the cartridge body 121, respectively. 1230) may be configured to form a constant step from the mounting surface. Therefore, the first flange 1210 and the second flange 1220 not only can restrict the movement of the pre-filter 150 in the axial direction, but also when the pre-filter is manufactured by wrapping oil absorbent paper in a method such as lapping, It can function as a guide member capable of guiding the winding of the oil absorber. The first flange 1210 and the second flange 1220 may have a structure in which the movement of air is blocked therein, and therefore, the air introduced from the compressor side is only directed to the filter mounting portion 1230 and the pre-filter 150 side. Through this, the desiccant may be introduced into the inside of the cartridge container.

As described above, on the premise that the thickness of the cross section of the pre-filter 150 and the outer diameter of the cartridge body 121 are constant, in order to sufficiently increase the volume of the pre-filter, the height of the area where the pre-filter is installed, that is, FIG. 2 As in, it is important to set the height of the filter mounting portion 1230 high enough.

Therefore, in a preferred embodiment of the present invention, at the outer end of the cartridge body 121, the height between the upper surface of the first flange 1210 and the lower surface of the second flange 1220 (hereinafter, "cartridge body height (h) ₁ ) "referred to as), the height between the lower surface of the first flange 1210 and the upper surface of the second flange 1220 (hereinafter referred to as 'filter mounting portion height (h ₂ )') is the cartridge body It can be configured to be at least 50% or more, preferably 70% or more of the height (h ₁ ). In this way, the outer portion of the cartridge body 121 is composed of only two flange portions and the pre-filter 150 installed therebetween, and the height of the filter mounting portion (h ₂ ) is set to 50% or more of the height of the cartridge body (h ₁ ). Compared to the air dryer cartridge of , the volume of the pre-filter can be increased.

On the other hand, the first flange 1210 and the second flange 1220 should be configured to provide a level of rigidity to prevent the pre-filter from coming off when the air dryer unit is driven after the pre-filter 150 is mounted, preferably. More specifically, the filter mounting portion height (h ₂ ) may be configured to be 90% or less of the cartridge body height (h ₁ ).

4 conceptually illustrates air flow in a supply mode and a regeneration mode in a cartridge for an air dryer according to a preferred embodiment of the present invention.

A series of arrows indicated on the left side of FIG. 4 indicate air flow in a supply mode in which compressed air is supplied and dehumidified through a desiccant. In this supply mode, the compressed air introduced from the compressor side moves to the pre-filter side through the air channel between the ribs of the cartridge body 121 and the air flow hole of the filter mounting part 1230, and then passes through the gap 145 into the housing. will move to the upper side. The compressed air moved to the upper part of the housing is introduced into the cartridge case through the cartridge cover 122, and then the moisture in the compressed air is dehumidified through a desiccant, and then supplied to the valve assembly side through the outlet port 144. .

Meanwhile, a series of arrows indicated on the right side of FIG. 4 shows an air flow in a regeneration mode in which compressed air stored in a compressed air reservoir such as a reservoir is introduced back into the air dryer cartridge to regenerate the desiccant.

In this regeneration mode, compressed air introduced from the reservoir through the outlet port 144 regenerates the desiccant and then passes through the gap 145 . Thereafter, the compressed air passing through the pre-filter may be discharged to the outside of the air dryer cartridge through the inlet port 143 and exhausted to the outside air through an unloading valve (not shown).

Meanwhile, FIG. 5 is a cross-sectional view of a cartridge for an air dryer according to another preferred embodiment of the present invention, and in FIGS. 6a and 6b, cartridge operating states in 'A' region in supply mode and regeneration mode, respectively, and Each air flow is shown.

In addition, FIG. 7a shows the cartridge operating state and air flow in the compressed air supply mode in the example of FIG. 5, and FIG. 7b shows the cartridge operating state and air flow in the regeneration mode.

In the embodiment of FIG. 5 , except that the pre-filter is divided into two areas and further includes a filter dividing gasket 210 and an air flap unit 220 for separately operating the active area of the pre-filter for each supply/regeneration mode. And, it is basically the same as the example of FIG. 2 .

Therefore, in the embodiment of FIG. 5, the description of the components overlapping with the embodiment of FIG. 2 is omitted, and for the pre-filter divided into two, the filter dividing gasket and the air flap portion provided to differentiate and activate them I will focus on explaining.

As shown in FIG. 5 , the pre-filter in this embodiment may be divided into two regions, an upper first filter region 150a and a lower second filter region 150b. Preferably, the two filter regions may be physically separated by a filter dividing gasket 210 inserted and fixed between the pre-filter holder 160 and the filter mounting part 1230 . The filter partition gasket 210 may be a ring-shaped elastic body made of an elastic material such as rubber that can be compressed to adjacent parts, and for example, known gaskets may be used.

According to one embodiment of the present invention, as shown in FIG. 5, a ring-shaped first horizontal band portion 1231 having a groove may be formed on the filter mounting portion 1230, and the first horizontal band portion 1231 may include two filters. It can be a positional criterion for classifying areas.

In addition, the filter division gasket 210 is inserted and fixed between the filter mount 1230 and the pre-filter holder 160, and the pre-filter holder 160 has a filter at a position corresponding to the groove 1232 of the first horizontal band. An annular second horizontal band portion 1610 having a groove for fixing the split gasket 210 may be formed. The annular second horizontal band portion 1610 may have the same shape as the central strip portion of the pre-filter holder 160 of FIG. .

Therefore, as the filter division gasket 210 is mounted between the first horizontal band part 1231 of the filter mounting part 1230 and the second band part of the pre-filter holder 160 as described above, two filter areas can be configured to be divided. .

Meanwhile, in the embodiment of FIG. 5 , a ring-shaped air flap 220 is installed along the outer circumferential surface of the pre-filter holder 160 in the radial direction.

The air flap unit 220 actively operates according to the flow direction of the compressed air for each compressed air supply/regeneration mode, allowing the flow of compressed air through the gap 145 or reducing the flow of compressed air through the gap 145. Provided to limit flow.

The air flap portion 220 is fixedly mounted on the pre-filter holder and extends from the pre-filter holder 160 toward the outer side of the air dryer cartridge in the radial direction, that is, from the pre-filter holder 160 toward the housing, It may have a laterally oriented structure. In addition, the air flap part 220 is made of an elastic body that can be deformed by external force, and in particular, its outer diameter can be increased or decreased compared to the normal state (before deformation by external force) according to the moving direction of the compressed air in the gap. do. To this end, the air flap unit may have a structure in which an inner end mounted on the pre-filter holder has a relatively thick thickness and an outer end deformed by an external force from compressed air has a relatively thin thickness.

Therefore, while the air flap portion is formed to be spaced apart from the housing in a normal state, when the compressed air has a generally downward flow, that is, in the regeneration mode, while the compressed air pressurizes the upper oriented outer end of the air flap portion, the air flap The outer end of the unit comes into contact with the inner wall of the housing while being pressed by the compressed air, and thus, the movement of the compressed air to the gap at the side of the second filter region may be selectively blocked.

Referring to FIGS. 6A and 7A , when compressed air shows a flow moving from the bottom to the top of the gap (in the supply mode), the air flap part 220 is folded toward the pre-filter holder 160 to open the passage inside the gap. can do. Therefore, in this supply mode, both of the two regions of the pre-filter, that is, the first filter region 150a and the second filter region 150b are activated, and thus foreign substances such as oil can be removed through both filter regions. there is.

On the other hand, as shown in FIGS. 6B and 7B, when the compressed air shows a flow moving from top to bottom of the gap (in the regeneration mode), the air flap part 220 is in close contact with the housing side, and the compressed air blows the air flap part ( 220) to limit movement to the bottom. Therefore, in the regeneration mode, the clean compressed air stored in the reservoir regenerates the desiccant inside the cartridge and then flows into the gap through the cartridge cover 122, and then the air flap unit 220 closes the activated first air. Compressed air moves only through the filter area 150a. Through this, it is possible to reduce compressed air consumption during regeneration and improve regeneration efficiency.

Meanwhile, in order to improve oil filtering and regeneration efficiency, the two filter regions may be formed of filter members having different filtering performance, for example, the average air gap of the filter member in the first filter region 150a of the pre-filter. The size may be set smaller than the average pore size of the filter member in the second filter region 150b. Through this, relatively large and heavy particles can be mainly filtered in the second filter area 150b close to the inlet port side of the compressed air, and relatively small and light particles can be mainly filtered in the first filter area 150a relatively far from the inlet port side of the compressed air. ) can be configured to be mainly filtered out.

In addition, by setting the pore size of the first filter region 150a activated during regeneration to be relatively small, the discharge resistance of the compressed air is increased in the regeneration mode to increase the moisture removal efficiency of the desiccant, thereby improving regeneration efficiency. It works.

Meanwhile, FIG. 8 shows a part of an air dryer cartridge according to another embodiment of the present invention, in the case of the embodiment of FIG. 8, except that an annular stopper 1101 is additionally formed on the inner wall of the housing, as shown in FIG. is substantially the same as the example of

In the case of this annular stopper 1101, it has a protruding annular structure while forming a certain height along the inner circumferential surface of the inner wall of the housing. As the air flap descends and adheres to the inner wall of the housing, the air flap supports the air flap so that the air flap is overturned. provided to prevent this. Therefore, since the behavior of the air flap unit 220 according to the air flow can be effectively controlled by the annular stopper 1101, the air flow can be stably induced even when unintended overpressure occurs.

In the above, the present invention has been described in detail based on examples and accompanying drawings. However, the scope of the present invention is not limited by the above embodiments and drawings, and the scope of the present invention will be limited only by the content described in the claims below.

100: air dryer cartridge 110: housing
120: cartridge container 130: base portion
131: reinforcing plate 132: seaming cap
133: gasket 140: desiccant
143: inlet port 144: outlet port
145: gap
150: pre-filter 160: pre-filter holder
150a: first filter region 150b: second filter region
210: filter partition gasket 220: air flap part
1101: stopper 1210: first flange
1220: second flange 1230: filter mounting portion
1231: first horizontal band portion 1232: first horizontal band portion groove
1610: second horizontal band portion 1620: second horizontal band portion groove

Claims (7)

An air dryer cartridge for a compressed air handling system of a commercial vehicle, comprising:
A cartridge container in which a desiccant is stored in the inner space;
a housing for accommodating the cartridge container;
a base portion configured to close the open surface of the housing and having an inlet port and an outlet port so that air can move into the housing;
a pre-filter installed on an outer circumferential surface of the cartridge container and divided into an upper first filter region and a lower second filter region; and
Including; a pre-filter holder installed while surrounding the outer surface of the pre-filter to prevent the separation of the pre-filter,
The pre-filter holder,
a ring-shaped filter partition gasket separating the first filter region and the second filter region; and
A ring-shaped air flap portion configured to block the gap between the cartridge container and the housing according to the flow of air; and
The cartridge container includes a filter mounting portion for mounting the pre-filter on its outer circumferential surface;
A first flange formed at an upper end of the filter mounting portion and protruding in a radial direction outside the cartridge container; and
A second flange formed at the lower end of the filter mounting portion and protruding in a radial direction outside the cartridge container; includes;
The average pore size of the filter elements in the first filter region is configured to be smaller than the average pore size of the filter elements in the second filter region;
The air flap part,
When compressed air is supplied, the gap inner passage is opened to activate both the first filter region and the second filter region;
During regeneration, the air dryer cartridge, characterized in that to activate only the first filter region by blocking a portion of the passage inside the gap.
The method of claim 1,
The height of the filter mounting portion corresponding to the height between the lower surface of the first flange and the upper surface of the second flange is 70 of the height of the cartridge body corresponding to the height between the upper surface of the first flange and the lower surface of the second flange. Air dryer cartridge, characterized in that formed in the range of more than % to less than 90%.
The method of claim 1,
The filter mounting portion is positioned between the first filter area and the second filter area and includes a first horizontal band portion having a groove formed toward the pre-filter holder,
The pre-filter holder includes a second transverse band portion positioned to correspond to the first transverse band portion and having a groove formed toward the pre-filter;
The air dryer cartridge, characterized in that the filter division gasket is inserted into and fixed to the groove of the first horizontal band portion and the groove of the second horizontal band portion.
The method of claim 3,
The air flap part is mounted on an outer circumferential surface of the pre-filter holder, extends from the pre-filter holder toward the housing, and is made of an elastic body having a structure oriented upward,
The air flap part is spaced apart from the housing in a normal state, and the upper oriented outer end of the air flap part contacts the inner wall of the housing according to the air flow direction in the gap and is configured to selectively block the movement of air. Characterized air dryer cartridge.
The method of claim 4,
The housing further includes a ring-shaped stopper protruding at a predetermined height along an inner circumferential surface of the inner wall,
An air dryer cartridge configured to be supported by the stopper when an outer end of the air flap unit descends.
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