WO2023090501A1

WO2023090501A1 - Pre-filter holder for air dryer cartridge in commercial vehicle and air dryer cartridge including same

Info

Publication number: WO2023090501A1
Application number: PCT/KR2021/017316
Authority: WO
Inventors: 문성원; 박상선
Original assignee: 주식회사 세명테크
Priority date: 2021-11-22
Filing date: 2021-11-23
Publication date: 2023-05-25
Also published as: KR102438981B1

Abstract

The present invention relates to a pre-filter holder which can be applied to an air dryer cartridge in a commercial vehicle capable of multi-stage filtering, and an air dryer cartridge having the pre-filter holder applied thereto. Particularly, the present invention provides the pre-filter holder which can provide a fixed pressing force while restraining a housing between the housing and the pre-filter, and thus may enhance the durability and filtering effect of the air dryer cartridge.

Description

Pre-filter holder of air dryer cartridge for commercial vehicles and air dryer cartridge including the same

The present invention is used for a dryer cartridge applied to a compressed air treatment system, and more particularly, to a device for supporting a pre-filter of a filter cartridge applied to an air dryer of 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 shows an example of a conventional filter cartridge.

In a conventional dryer unit, a desiccant is stored in a cartridge to ensure dehumidification performance, and an oil adsorption filter is installed near an inlet of compressed air to remove oil. The oil adsorption filter is installed in the housing of the filter cartridge, and may be installed upstream before compressed air is introduced into the desiccant inside the housing. Therefore, since the purified air from which oil is previously filtered out by the oil adsorption filter passes through the desiccant, contamination of the desiccant with oil can be prevented.

When manufacturing the oil adsorption filter, a wrapping material made of a porous material or a non-woven material may be used, and the oil absorption filter having a certain thickness may be manufactured while winding the wrapping material around the inner wall of the housing.

On the other hand, in the case of an oil adsorption filter fixed to the inside of the housing by a method such as wrapping, there is a risk of being separated by an impact as a repetitive compressed air treatment process is performed. In particular, in the case of a compressed air treatment device for commercial vehicles, high-pressure compressed air flows through the filter cartridge, and in this process, the oil adsorption filter may be damaged due to detachment of the wrapped oil adsorption paper. In addition, cracks occur in the internal structure of the oil adsorption filter due to the separation of the oil adsorption paper, and thus the filtering performance of the oil adsorption filter may deteriorate.

The present invention has been made to solve the above problems, and in the present invention, the pre-filter that primarily filters oil and foreign substances contained in compressed air can be effectively fixed and supported to prevent separation or damage to the pre-filter. Its purpose is to provide a filter holder for an air dryer cartridge for a commercial vehicle that can be used.

In particular, in the present invention, when high-pressure compressed air is discharged through the desiccant during regeneration, the air dryer cartridge with improved durability is configured to effectively prevent the oil sorbent from escaping toward the inner surface of the housing by the high-pressure compressed air. Its purpose is to provide

In addition, another object of the present invention is to prevent the housing inner passage from being blocked due to impact and to prevent the housing from being damaged by an external force.

In addition, another object of the present invention is to improve the filtering effect of the pre-filter by minimizing reduction in the supply and regeneration efficiency of compressed air and applying a constant initial pressing force to the pre-filter.

In addition, another object of the present invention is to provide a filter holder for an air dryer cartridge that is easy to manufacture with a simple assembly structure.

In order to achieve the above object, in a preferred embodiment of the present invention, a pre-filter holder for supporting a pre-filter installed in an air dryer cartridge for a commercial vehicle, the pre-filter holder is made by assembling two or more filter holding elements, The filter holding element may include an arc-shaped frame formed to surround and support a portion of the outer circumferential surface of the pre-filter; a pressing socket formed at one end of the arc-shaped frame; and a fastening ring fastenable to the pressure socket. The pre-filter holder may be provided, and the pressure socket may include a pressure piece and a fastening groove.

According to the present invention, it is possible to prevent separation or damage to the oil adsorption paper constituting the pre-filter by the pre-filter fixed and supported to the filter holder, so that the oil removal performance of the pre-filter can be continuously maintained. In addition, the durability of the filter cartridge is improved by effectively preventing oil or the like from entering the desiccant or the like.

In addition, according to the present invention, there is an effect of improving the filtering effect of the pre-filter by minimizing reduction in supply and regeneration efficiency of compressed air and applying a constant initial pressing force to the pre-filter.

In particular, according to the present invention, it is possible to prevent the pre-filter from being damaged or detached due to the impact of compressed air, thereby preventing the housing internal passage from being blocked, and preventing the housing from being damaged by an external force acting on the housing. .

In addition, the pre-filter holder according to a preferred embodiment of the present invention has a structure in which a plurality of holder parts are seated around the pre-filter and assembled by fitting them together, so it is easy to assemble and can be easily applied to the mass production process of filter cartridges. There are advantages.

2 is a cross-sectional view of a cartridge for a dryer in which a pre-filter holder according to a preferred embodiment of the present invention is installed.

FIG. 3 conceptually illustrates a structure in which a pre-filter holder fixes and supports a pre-filter inside a housing in the dryer cartridge of FIG. 2 .

4 is a pre-filter holder according to a preferred embodiment of the present invention, showing an example of a pre-filter holder assembled by two holding members;

FIG. 5 shows a holding member constituting the pre-filter holder of FIG. 4 .

In order to achieve the above object, in a preferred embodiment of the present invention, a pre-filter holder for supporting a pre-filter installed in an air dryer cartridge for a commercial vehicle, the pre-filter holder is made by assembling two or more filter holding elements, The filter holding element may include an arc-shaped frame formed to surround and support a portion of the outer circumferential surface of the pre-filter; a pressing socket formed at one end of the arc-shaped frame; and a fastening ring fastening to the pressure socket.

The pressure socket may include a pressure piece and a fastening groove.

The pressing piece has a plate shape bent outward to form a contact surface with the housing at an outermost part, and the fastening groove may be a groove formed by a reinforcing member supporting the pressing piece while vertically extending up and down the pressing piece.

The fastening ring may include a clasp having an inclined surface so that it can be introduced into the fastening groove and fixed thereto.

A fastening ring of each filter holding element is coupled to a fastening groove of an adjacent filter holding element, and a pre-filter holder to which each filter holding element is coupled may have a ring shape.

Two or more filter holding elements all have the same structure, and each filter holding element may be configured to support a pre-filter in the same area.

The pre-filter holder has a ring-shaped structure in which the first filter holding element and the second filter holding element are fastened to each other, and the arc frame of the first filter holding element covers a larger area than the arc frame of the second filter holding element. can be configured to do so.

Each of the filter holding elements may further include one or more pressing members protruding between fastening rings formed at both ends of each filter holding element and the pressing socket.

The arc frame includes a pair of main horizontal frames arranged vertically; A pair of main vertical frames connecting between the main horizontal frames; may include.

The main horizontal frames may be connected by a plurality of first auxiliary supports formed perpendicularly to the main horizontal frames, and a plurality of openings may be formed between the first auxiliary supports.

One or more second auxiliary supports extending in a horizontal direction may be formed between the main vertical frames extending in the vertical direction and at least some of the first auxiliary supports.

The pressing member may be formed between first auxiliary supports that are not connected by second auxiliary supports.

In addition, according to a preferred embodiment of the present invention, an air dryer cartridge is provided in which a pre-filter installed on a cartridge housing unit in which a desiccant is stored is supported by such a pre-filter holder.

To fix the pre-filter, the pre-filter holder is inserted and assembled into the housing while being temporarily assembled on the outside of the pre-filter, and the pre-filter can be fixed as the pre-filter holder is pressed by the inner wall of the housing.

A gap for moving compressed air is formed between the outer circumferential surface of the cartridge container and the inner wall of the housing, and a collision member is installed in the gap so that the air moving through the gap collides with the collision member to filter oil. there is

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 certain part 'includes' a certain component, this means that it may further include other components without 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 an outlet 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 the air flows in the opposite direction inside the cartridge during regeneration, the fact that 'inflow' and 'outflow' are opposite to those when compressed air is supplied is known 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. In addition, in the present specification, compressed air is 'regenerated' means that the compressed air is humidified while removing moisture from the desiccant inside the cartridge by purified compressed air flowing into the filter cartridge through a compressed air storage means such as an internal storage for the main brake. It means the process of expelling air to the outside.

Hereinafter, a pre-filter holder and an air dryer cartridge including the pre-filter holder according to preferred embodiments of the present invention will be described with reference to the accompanying drawings.

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 portion 120 filled with a desiccant 170 inside a generally 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 portion 120 filled with a desiccant 170 is located inside the housing 110 . The desiccant 170 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 is completely filled in the inner space of the cartridge container 120, and the density of the desiccant can be sufficiently increased as the cartridge container 120 is pressed by the upper spring member 150.

In the case of the example of Figure 2, the spring member 150 is located on top of the housing 110, an example of a top-down structure for pressing the cartridge container portion 120 downward. Meanwhile, the spring member may have a bottom-up structure located at the lower end of the housing, and in the present invention, the pre-filter holder 180 may be installed regardless of the position of the spring member.

The cartridge container portion 120 refers to the entire container for storing the desiccant, and the cartridge container portion 120 includes a substantially cylindrical cartridge body 121 and a cartridge cover 122 covering the opening of the cartridge body 121. can do. The cartridge cover 122 functions as a lid that prevents the desiccant from being discharged to the outside, and at the center is an outlet functioning as an outlet port 172 so that compressed air passing through the desiccant inside the cartridge container 120 can be discharged. is formed

At the lower end of the cartridge container portion 120, a base portion 130 for fixing the cartridge container portion 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 while limiting the movement of fluid in the remaining area of the base part 130 except for the inlet port 171 and the outlet port 172 within the housing. can be sealed.

The specific structure of the base part 130 is not limited to that illustrated in FIG. 2, and any structure capable of inflow and outflow of compressed air capable of processing and reproducing compressed air can be applied without limitation.

Also, since the air dryer cartridge 100 is generally mounted directly on the valve assembly of the air handling system, the air dryer cartridge 100 may have a fastening structure for mounting to the air handling system. In this example, base portion 130 may include a fastening structure for direct mounting to a valve assembly of a compressed air handling system.

Meanwhile, a pre-filter 140 for primarily filtering foreign substances such as oil may be installed inside the air dryer cartridge. The pre-filter in the present invention means a filter member installed upstream of the cartridge container 120 in which the desiccant is stored, that is, before the compressed air passes through the desiccant (based on the step of supplying (processing) the compressed air). can The pre-filter 140 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 140 is not limited to the one exemplified above, and may be used without limitation as long as it can pre-filter the compressed air before the compressed air is introduced into the desiccant during the compressed air treatment process. However, in the present invention, since it is possible to effectively prevent the oil adsorption paper attached and fixed by the wrapping method from being separated, the pre-filter holder 180 according to a preferred embodiment of the present invention is a pre-filter fixed to the cartridge container part in particular by the wrapping method. more suitable for

The cartridge body 121 of the cartridge container portion 120 may be made of a concentric cylindrical structure with the cylindrical housing 110, and thus may form a gap 145 between the cylindrical housing and the cylindrical housing.

The gap 145 between the housing and the cartridge container portion 120 is a passage through which compressed air introduced into the cartridge moves. Therefore, when the compressed air is processed, the compressed air introduced into the cartridge passes through the gap 145 and moves toward the desiccant inside the cartridge container. On the other hand, when the compressed air is regenerated, the compressed air introduced into the cartridge may pass through the desiccant and be discharged to the outside through the gap 145 .

A filter seating portion 123 is formed in the cartridge container portion so that the pre-filter 140 can be installed. The filter seating portion 123 may be formed on the small diameter portion of the cartridge container portion formed to facilitate the wrapping of the oil adsorption paper constituting the pre-filter 140. The cartridge container unit accommodates the desiccant therein, and it is preferable to maximize the desiccant storage volume in the cartridge container unit in order to maximize the dehumidification effect by the desiccant. To this end, the cartridge container portion may have a structure including a large-diameter portion having an outer diameter sufficiently close to the housing and a small-diameter portion in which the pre-filter 140 is seated.

A plurality of inlet holes may be formed in the small diameter portion to allow compressed air to flow into the desiccant side, and the filter seat 123 may be formed in the small diameter portion to support the pre-filter 140 . The filter seating portion 123 may include a seating surface so that the filter is seated and supported on the cartridge container portion. In addition, the filter seating part 123 may include a pair of upper and lower guide parts 123a for guiding the wrapping of the pre-filter and limiting the vertical movement of the pre-filter 140 . Therefore, the filter seating portion 123 in the filter cartridge according to a preferred embodiment of the present invention includes a seating surface formed to allow the filter to be seated along the circumference of the small diameter portion and a pair of annular guide portions extending outward from the seating surface. (123a) may be included.

In addition, one or more ribs 123b protruding in an outer radial direction may be formed around the inlet holes of the small diameter portion. The rib 123b supports the pre-filter 140 together with the seating surface, and prevents the pre-filter 140 from retracting due to the compressed air flowing in from the inner gap 145 of the housing during the compressed air treatment step. can do.

According to a preferred embodiment of the present invention, a pre-filter holder 180 may be installed between the outer surface of the pre-filter 140 installed on the filter seat 123 and the housing, and the pre-filter holder 180 The pre-filter can be supported and fixed by

As shown in FIG. 2 , the outer end of the pre-filter holder 180 may be in close contact with the inner surface of the housing, while the inner end may be in close contact with the outer circumferential surface of the pre-filter 140 .

As shown in FIG. 2, the pre-filter holder 180 is fixed by a pressure socket 210 and a fastening ring 220, which will be described later, and can be adhered to the inner wall of the housing by the outermost surface of the pressure socket 210. there is. FIG. 3 shows an example in which the pre-filter holder 180 is inserted between the housing and the pre-filter in the air dryer cartridge of FIG. 2, and in the example of FIG. 3, in close contact with the inner wall of the housing at a total of four locations at 90 degree intervals. example is shown. For reference, the example of FIG. 3 shows a pre-filter holder 180 in which two

filter holding elements

200 and 300 are assembled, and in the example of FIG. It is in close contact with the housing. In addition, in the remaining two places, an example in which the filter holding element 200 is in close contact with the housing by the additionally formed pressing member 240 in addition to the pressing socket 210 is described. In this regard, the contact position and the number of each of the pressure socket 210 and the pressure member 240 may be appropriately changed. However, in order to fix the pre-filter and effectively apply a pressing force to the filter, the pressing socket and the pressing member may be arranged at regular intervals, forming a circle between the housing and the cartridge container. In addition, it is preferable to include at least four or more pressing sockets and pressing members, and may be arranged at a position connected by a central axis to an opposite pressing socket (or pressing member) on the cross section while forming a symmetrical structure.

On the other hand, according to a preferred embodiment of the present invention, the compressed air introduced from the compressor may further include a filtering element of the cartridge container portion for primarily filtering before passing through the pre-filter and the desiccant. This filtering element may be a collision member 160 protruding from the outer circumferential surface of the cartridge container.

The collision member 160 protrudes from the outer circumferential surface of the cartridge container portion 120, and may be configured to primarily filter oil and foreign substances while air moving through the gap 145 collides with the collision member 160. there is.

Each of the impact members 160 is to be disposed in the gap 145 between the housing 110 and the cartridge container portion 120, and may be integrally formed with the cartridge container portion 120 by injection molding.

Looking at the supply of compressed air, the air introduced through the compressor is introduced through the inlet port 171, and then through the gap 145 between the housing 110 and the cartridge container 120, the lower housing 110 from to the top. At this time, the air passing through the gap 145 collides with the impact member 160 within the gap 145, and oil and the like are separated and remain on the impact member 160. For reference, the separated oil remains on the collision member 160 or falls down to the oil sump at the bottom of the housing 110 along the outer wall of the housing 110 due to gravity. After that, when regeneration is performed, the oil components collected in the oil sump or the like may be discharged to the atmosphere together with the regeneration air.

The collision member 160 may be a spiral blade-type protrusion as shown in FIG. 2, and since the collision member 160 may be formed as close to the housing 110 as possible, the internal configuration of the cartridge while the housing is crushed by an external force. It works to prevent damage to them. In particular, in the air dryer cartridge according to a preferred embodiment of the present invention, the collision member and the pre-filter holder 180 may be applied at the same time. When deformed, since the acting force can be dispersed, damage to the housing and internal components of the cartridge can be effectively prevented.

Hereinafter, with reference to FIGS. 4 and 5, an example of a pre-filter holder 180 of an air dryer cartridge for a commercial vehicle according to a preferred embodiment of the present invention will be described in detail.

4 shows an example of a pre-filter holder 180 assembled by two

filter holding elements

200 and 300 as a pre-filter holder 180 according to a preferred embodiment of the present invention, and in FIG. The filter holding element 200 constituting the pre-filter holder 180 of 4 is shown.

As shown in FIGS. 4 and 5, the pre-filter holder 180 may be formed by assembling two or more filter holding elements, and the filter holding element 200 is formed to surround and support a part of the outer circumferential surface of the pre-filter. It may include an arc frame 230 , a pressure socket 210 formed at one end of the arc frame 230 , and a fastening ring 220 fastening to the pressure socket 210 . Refers to members to which mechanical fastening elements for fastening the filter holding elements adjacent to the pressure socket 210 and the fastening ring 220 are applied, for example, the fastening ring 220 is fitted into the pressure socket 210. can be concluded. Preferably, the pressure socket 210 provides a pressure toward the pre-filter while being in contact with the inner wall of the housing, and substantially means a configuration for fixing the pre-filter by the pressure applied toward the pre-filter.

In particular, the pressing socket 210 may include a pressing piece 211 and a fastening groove 212, and the pressing piece 211 may form a contact surface with the housing at the outermost part in the outer direction of the arc-shaped frame. It may have a plate shape bent up and down toward the . The pressing piece 211 may be bent toward the outside of the arc-shaped frame 230, preferably, in a plate shape bent while having a certain curvature. Through such a structure of the pressure piece 211, only the outermost end can support the pre-filter while contacting the housing, and while the curved shape of the pressure piece 211 is appropriately deformed, the pressing force by the housing is appropriately distributed toward the arc-shaped frame. While doing so, it is possible to impart structural stability to the entire filter holding element and pre-filter holder. In addition, the pressing force by the housing is distributed and pressurized to the entire outer circumferential region of the pre-filter through the pressing piece and the arc-shaped frame, and the entire region of the pre-filter can be supported and pressurized.

In addition, the fastening groove 212 may be a groove formed by a reinforcing member 213 supporting the pressing piece 211 while vertically extending upward and downward of the pressing piece 211 .

The fastening ring 220 is for coupling with the pressure piece 211 and, for example, as shown in FIG. 5 , may include a clasp 221 formed with an inclined surface so that it can be introduced into the fastening groove and fixed thereto. However, this example is just one example, and may be changed to another form that can be fastened with the pressing piece 211.

In addition, according to a preferred embodiment of the present invention, the pre-filter holder 180 includes two or more filter holding elements 200, and each filter holding element 200 has a fastening ring connected to an adjacent filter holding element 200. ) Can be coupled to the fastening groove 212. In addition, since the pre-filter is a ring-shaped filter member installed on the cylindrical cartridge body, the pre-filter holder 180 to which each filter holding element is coupled may also have a ring shape corresponding to the shape of the filter member. .

4 shows an example in which two filter holding elements as in FIG. 5 are combined to form a pre-filter holder 180, and the two

filter holding elements

200 and 300 have substantially the same shape. That is, each filter holding element includes one pressure socket 210 and one fastening ring 220, through which the two filter holding elements can be coupled to each other.

Meanwhile, unlike the example of FIG. 4 , it may be divided into three or more filter holding elements. In this case, all three or more filter holding elements have the same structure, and each filter holding element holds a pre-filter in the same area. It can also be configured to support.

Meanwhile, in the case of configuring the pre-filter holder 180 with the two

filter holding elements

200 and 300, unlike the examples of FIGS. 4 and 5, the first filter holding element constituting the pre-filter holder 180 200 and the second filter holding element 300 may be configured to have different sizes. In this example, the two filter holding elements are fastened together to form a pre-filter holder 180 having an annular structure, and the arc-shaped frame 230 of the first filter holding element 200 is connected to the second filter. A larger area can be covered than the arc-shaped frame 230 of the holding element 300 .

When the pre-filter holder 180 is composed of two filter holding elements having different cover areas, the first filter holding element 200 covering the pre-filter area of 180 degrees or more is first placed on the pre-filter side during assembly. Then, the second filter holding element 300 may be assembled, and in this case, assemblability and filter pressing performance may be improved.

In addition, each of the filter holding elements 200 may further include one or more pressing members 240 formed to protrude between the fastening rings 220 formed at both ends of each filter holding element 200 and the pressing socket 210. can The pressing member 240 may have the same or similar shape as the aforementioned pressing piece 211 . Therefore, the pressing member 240 may be bent toward the outer side of the arc-shaped frame 230, preferably, may have a plate shape bent while having a certain curvature. Unlike the pressing socket 210, the pressing member 240 may not have a separate fastening groove 212 formed therein, and may include only the pressing piece 211.

In addition, the arc-shaped frame 230 constituting the filter holding element 200 includes a pair of main horizontal frames 231 disposed vertically and a pair of main vertical frames connecting the main horizontal frames 231 to each other. (232). As shown in FIG. 5, the main horizontal frames 231 are arc-shaped frames extending in the horizontal direction, and may be provided with a pair of upper and lower parts. In addition, these main horizontal frames 231 may be formed to be fitted between a pair of guide parts 123a of the filter seating part 123 formed on the cartridge container part, through which the pre-filter holder 180 It can regulate the movement up and down.

In addition, the main horizontal frames 231 are connected by a plurality of first auxiliary supports 233 formed perpendicularly to the main horizontal frames 231, and a plurality of openings are formed between the first auxiliary supports 233.

Fields

235 and 236 may be formed. As shown in FIG. 5 , various types of openings may be applied to the plurality of

openings

235 and 236 .

One or more second auxiliary supports 234 extending in the horizontal direction may be formed between at least some of the main vertical frames 232 and the first auxiliary supports 233 extending in the vertical direction. The first and second auxiliary supports 233 and 234 serve to provide structural rigidity of the arc-shaped frame 230 and function to prevent the pre-filter holder 180 from being damaged by the force of compressed air. However, since the first and second auxiliary supports 233 and 234 block the flow of compressed air, an optimal arrangement of the first and second auxiliary supports 233 and 234 is required for system efficiency and structural robustness. do.

Meanwhile, the pressing members 240 described above may be formed between the first auxiliary supports 233 that are not connected by the second auxiliary supports 234 . In this regard, since the pressing member 240 may function as an additional reinforcing material in a portion where the pressing member 240 is additionally formed, the second auxiliary support 234 is not added in the area where the pressing member 240 is formed, It can be designed to secure the maximum opening area through which compressed air can move.

4 shows an example in which the pre-filter is supported by the pre-filter holder 180 to which the filter holding element 200 having such a configuration is assembled, and in the case of compressed air treatment, the filter seating part downstream of the pre-filter ( 123), and conversely, during regeneration, the pre-filter can be supported by the pre-filter holder 180, so components such as the wrapped oil absorbent paper constituting the pre-filter are separated. can be effectively prevented. In particular, according to the present invention, in fixing the pre-filter, the pre-filter holder is inserted and assembled into the housing in a state of being temporarily assembled on the outside of the pre-filter, and thus the pre-filter holder is pressed by the inner wall of the housing, Since it can be fixed, it is characterized in that the pre-filter can be effectively fixed in both cases of supplying and regenerating compressed air.

In addition, as shown in FIG. 2, since the pre-filter holder fixing the pre-filter while being inserted into the housing can continuously provide a constant level of pressing force to the pre-filter, the porosity of the pre-filter can be continuously maintained at a constant level. Therefore, there is an advantage in that filter durability can be improved and continuous filter performance can be maintained.

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.

Claims

A pre-filter holder for supporting a pre-filter installed in an air dryer cartridge for commercial vehicles,

The pre-filter holder is formed by assembling two or more filter holding elements,

The filter holding element,

an arc-shaped frame formed to surround and support a portion of an outer circumferential surface of the pre-filter;

a pressing socket formed at one end of the arc-shaped frame; and

A pre-filter holder comprising a fastening ring fastening to the pressure socket.
The method of claim 1,

The pre-filter holder, characterized in that the pressing socket comprises a pressing piece and a fastening groove.
The method of claim 2,

The pressing piece has a plate shape bent up and down to form a contact surface with the housing at the outermost part,

The fastening groove is a pre-filter holder, characterized in that the groove formed by a reinforcing member supporting the pressing piece while vertically extending up and down the pressing piece.
The method of claim 3,

The pre-filter holder, characterized in that the fastening ring includes a latch portion formed with an inclined surface so that it can be introduced into the fastening groove and fixed.
The method of claim 1,

The fastening ring of each filter holding element is coupled to the fastening groove of an adjacent filter holding element,

A pre-filter holder, characterized in that the pre-filter holder to which each filter holding element is coupled has a ring shape.
The method of claim 5,

The two or more filter holding elements all have the same structure,

Each filter holding element is a pre-filter holder, characterized in that configured to support the pre-filter in the same area.
The method of claim 1,

The pre-filter holder has a ring-shaped structure formed by fastening a first filter holding element and a second filter holding element to each other,

The pre-filter holder, characterized in that the arc-shaped frame of the first filter holding element is configured to cover a larger area than the arc-shaped frame of the second filter holding element.
The method of claim 1,

Each filter holding element is

The pre-filter holder according to claim 1, further comprising at least one pressing member formed to protrude between the fastening ring formed at both ends of each filter holding element and the pressing socket.
The method of claim 8,

The arc-shaped frame,

a pair of main horizontal frames arranged vertically;

A pre-filter holder characterized in that it comprises a; a pair of main vertical frames connecting between the main horizontal frames.
The method of claim 9,

The main horizontal frames,

connected by a plurality of first auxiliary supports formed perpendicular to the main horizontal frames;

A pre-filter holder, characterized in that a plurality of openings are formed between the first auxiliary supports.
The method of claim 10,

A pre-filter holder, characterized in that one or more second auxiliary supports extending in a horizontal direction are formed between the main vertical frames extending in the vertical direction and at least some of the first auxiliary supports.
The method of claim 11,

The pre-filter holder, characterized in that the pressing member is formed between the first auxiliary supports that are not connected by the second auxiliary supports.
An air dryer cartridge supported by the pre-filter holder according to claim 1, wherein a pre-filter installed on the cartridge housing portion containing the desiccant is supported.
The method of claim 13,

The pre-filter holder is inserted and assembled into the housing in a state of being temporarily assembled on the outside of the pre-filter to fix the pre-filter, and fixing the pre-filter as the pre-filter holder is pressed by the inner wall of the housing Characterized air dryer cartridge.
The method of claim 14,

A gap for moving compressed air is formed between the outer circumferential surface of the cartridge container and the inner wall of the housing,

An air dryer cartridge, characterized in that, a collision member is installed in the gap, and the air moving through the gap is configured to filter oil while colliding with the collision member.