KR20240102194A - Replacable-filter body type air dryer cartridge - Google Patents

Abstract

The present invention is an air dryer cartridge for commercial vehicles, which adopts a screw connection between the housing tab portion and the base plate fastening portion so that only the filter body inside the cartridge can be selectively replaced, and the air dryer has a new structure in which the structure is reinforced by a clamping mechanism. It's about cartridges. In particular, the present invention provides an air dryer cartridge including a pressure adjustment unit capable of selectively providing a pressure force to the filter body by a spring member and a movable plate for ease of assembly and replacement.

Description

Filter Body Replaceable Air Dryer Cartridge {REPLACABLE-FILTER BODY TYPE AIR DRYER CARTRIDGE}

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

In commercial vehicles, various operating systems using pneumatics 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, etc. High-pressure compressed air is required to drive these pneumatic systems, and this compressed air is generated through a compressor driven by an engine or drive motor and then delivered to reservoirs in the system that consume each compressed air.

Meanwhile, 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 can have a negative impact on the system, such as causing a breakdown of the pneumatic system or reducing its durability. do.

Therefore, in a system that generates and supplies 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 create dry air.

Figure 1 shows an example of a compressed air treatment system equipped with a conventional dryer unit.

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

On the other hand, when the dehumidifier in the dryer unit does not provide sufficient dehumidifying performance, such as reaching a saturated state, a regeneration process may be performed to restore the dehumidifier performance by returning dry compressed air to the dryer unit, and in this case, the compressed air flow It generally shows a flow in the opposite direction compared to when supplying silver.

For example, Korean Patent Publication No. 10-2018-0118715 (Patent Document 1) and Korean Patent No. 10-2248424 (Patent Document 2) disclose an air dryer cartridge for a compressed air treatment system.

The air dryer cartridges disclosed in Patent Documents 1 and 2 above are fixed by directly fastening the dryer cartridge itself to the valve unit. Meanwhile, if the performance of the internal dehumidifier, oil absorbent paper, etc. deteriorates, the air dryer cartridge needs to be replaced. However, the existing air dryer cartridge had operational difficulties in that the air treatment unit had to be removed from the vehicle and then the dryer cartridge had to be replaced from the air treatment unit. In addition, when replacing the air dryer cartridge, the entire cartridge had to be replaced, which had the disadvantage of making it impossible to recycle parts.

Korean Patent Publication No. 10-2018-0118715 (2018. 10. 31.) Korean Patent No. 10-2248424 (2021. 04. 29.)

The purpose of the present invention is to provide an air dryer cartridge in which only the parts related to dehumidification and filtering performance that are consumable and require replacement among the components of the air dryer cartridge can be selectively replaced.

In particular, another object of the present invention is to provide an air dryer cartridge configured to modularize consumables that need to be replaced in the air dryer cartridge and to easily replace them.

Through this, the purpose of the present invention is to construct an air dryer cartridge so that other parts of the air dryer cartridge components except the internal filter body can be reused, and the vehicle owner can easily replace only the filter body parts without using special tools. There is.

In addition, another purpose of the present invention is to provide an air dryer cartridge structure that can mass-produce housing parts that were previously manufactured by deep drawing from steel materials using aluminum die casting.

In order to achieve the above object, a preferred embodiment of the present invention provides an air dryer cartridge for a compressed air processing system of a commercial vehicle, comprising: a housing having a boss portion with an opening on one side and an open end on the other side; a filter body stored inside the housing; a base plate assembled to the open end of the housing to secure the filter body inside the housing; and a pressure adjustment unit installed in the boss portion and provided to pressurize the filter body, wherein a tab portion is formed on the inside of an open end of the housing, and a tab portion is screw-connectable to the tab portion on an outer circumference of the base plate. An air dryer cartridge is provided, wherein a fastening part is formed, and the tab part of the housing is coupled with the fastening part of the base plate to fix the filter body inside the housing.

In addition, a clamping ring portion deformable in the housing radial direction; It may further include a clamping mechanism including a coupling element for fixing both ends of the clamping ring portion, and the clamping mechanism may be mounted in a clamping groove formed on an outer surface of the housing corresponding to the position of the tab portion.

Additionally, a first sealing member for providing airtightness between the housing and the base plate is inserted below the tab portion of the housing and the fastening portion of the base plate, and a second sealing member is inserted between the base plate and the filter body. can be inserted.

The pressure adjustment unit includes a spring member compressible to apply a spring force to the filter body; It may include a movable plate that supports the spring member and moves as it comes into close contact with the filter body to compress the spring member.

The pressure adjustment unit includes a main fixing bolt fixed to the boss portion; A sub-fastening bolt fixed to the main bolt body of the main fixing bolt; It may further include a stopper inserted and fixed between the main fixing bolt and the sub-fastening bolt.

In addition, a third sealing member is inserted between the main bolt head of the main fixing bolt and the housing boss portion, the sub fastening bolt is fastened to the fastening groove formed in the main bolt body of the main fixing bolt, and the stopper is connected to the sub fastening bolt. It may include a sub-bolt insertion hole into which the bolt body can be inserted, a stopper groove into which the sub-bolt head can be inserted, and a stopper inner flange formed on the upper inner surface of the stopper so that it can be fixed by the sub-bolt head.

In addition, the stopper further includes a stopper outer flange extending from the lower outer surface, and the movable plate has a main bolt insertion hole formed in the center, a plate groove into which the stopper can be inserted, and an upper inner flange extending from the movable plate. It includes a plate inner flange and a plate outer flange extending from a lower outer surface of the movable plate, wherein the stopper outer flange is configured to support the plate inner flange, and the plate outer flange is capable of supporting the spring member. It can be configured to do so.

In addition, the pressure adjustment unit maintains a state in which the movable plate is supported by the stopper external flange and the filter body is stored inside the housing before coupling the housing and the base plate, When the base plate is assembled, the movable plate may leave the stopper external flange to press the spring member.

Additionally, the depth of the plate groove may be greater than the height of the external flange of the stopper 250.

In addition, a broken portion for forming a flow path connected to the inside of the housing is formed on the main bolt body of the main fixing bolt, and a coupling protrusion that can be engaged with the broken portion may be formed on the upper surface of the stopper.

According to the present invention, among the main parts of the air dryer cartridge, only the filter body including the oil absorbent paper and dehumidifier, which are directly related to actual performance, can be selectively replaced, so there is an advantage of reusing existing parts such as the housing. there is.

In particular, according to the present invention, when replacing the filter body, the spring force applied to the filter body is released by rotating the upper bolt, and then only the internal filter body can be easily replaced, thereby simplifying the replacement work and allowing the user to easily replace the filter. It has the advantage of being self-replaceable.

In addition, the filter body can be replaced after removing only the air dryer cartridge without removing the large and heavy compressed air treatment device itself from the vehicle, which has the advantage of simplifying the replacement work.

In addition, according to the present invention, housing parts that were previously manufactured from steel materials by deep drawing can be manufactured by aluminum die casting, which has the advantage of increasing productivity and reducing weight.

Figure 1 shows an example of a compressed air treatment system equipped with a conventional dryer unit.
Figure 2 is a cross-sectional view showing the main configuration of a cartridge for an air dryer according to a preferred embodiment of the present invention.
Figure 3 is an exploded perspective view of the main components of a pressure adjustment unit for replacing a filter body in a cartridge for an air dryer according to a preferred embodiment of the present invention.
Figure 4 is a cross-sectional view of the pressure adjustment unit of Figure 3;
Figures 5A to 5E are for explaining the assembly process of a cartridge for an air dryer according to a preferred embodiment of the present invention.
FIGS. 6A and 6B show the operating state of the pressure adjustment unit. FIG. 6A is an enlarged view of area 'A' in FIG. 5C, and FIG. 6B is an enlarged view of area 'B' in FIG. 5D.

The embodiments described below are merely intended to provide a detailed description so that a person skilled in the art can easily implement the invention, and this does not mean that the scope of protection of the present invention is limited. No. Accordingly, substitutions or changes to some components 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 is said to 'include' a certain component, this does not mean excluding other components, but may include other components, unless specifically stated to the contrary.

The air dryer cartridge described in this specification, like a conventional dryer cartridge, is configured to remove oil in compressed air, dry the compressed air, and supply it in one direction, while supplying compressed air for cartridge regeneration under certain conditions. This means that it is configured to carry out the process of flowing in the opposite direction and then discharging into the atmosphere. In particular, the air dryer cartridge in this specification refers to an assembly with built-in filters configured to remove foreign substances and moisture contained in compressed air, and refers to a device configured to allow the inflow and outflow of compressed air into the filters. In addition, in this specification, the filter body refers to a part that includes filters for dehumidification and/or removal of foreign substances, and this filter body refers to a part that is replaceably installed in the housing of the air dryer cartridge. Therefore, in this specification, the filter body is one of the parts constituting the air dryer cartridge, and may refer to a general term for filter assembly parts that are replaceable after removal.

The air dryer cartridge according to the present invention is configured to include an inlet port through which compressed air flows in and an outlet port through which compressed air is discharged. The terms 'inlet' and 'outlet' used herein depend on the operating state of the compressed air treatment system. It is a concept that is relatively determined, and is related to the direction of flow of compressed air. However, for convenience of explanation, in this specification, 'inflow' and 'outflow' are defined based on the state in which compressed air is supplied, that is, the state in which the air generated from the compressor flows into the air dryer cartridge and then flows out to the valve assembly. Explain. For reference, since the air flows in the opposite direction inside the cartridge during regeneration, the 'inflow' and 'outflow' are opposite to those when compressed air is supplied. Those skilled in the art will understand that If so, you will fully understand.

Additionally, in this specification, compressed air being 'processed' means that oil, moisture, and foreign substances in the compressed air are filtered out as the compressed air passes through the filter cartridge.

Hereinafter, a filter body replaceable air dryer cartridge according to a preferred embodiment of the present invention will be described with reference to the attached drawings.

Figure 2 is a cross-sectional view showing the main components of an air dryer cartridge according to a preferred embodiment of the present invention, and Figure 3 is a main configuration for replacing the filter body, showing main components related to the pressure adjustment unit of the air dryer cartridge. This is an exploded perspective view.

The air dryer cartridge 1 according to a preferred embodiment of the present invention is formed to be substantially rotationally symmetrical with respect to a vertical central axis, and has a filter body 120 filled with a desiccant housed inside a generally cylindrical housing 110. It has a shape. As shown in FIG. 2, the cylindrical housing 110 may have an open end formed on one side to allow the filter body 120 to be introduced into the internal space. In addition, a closed structure is provided on the other side of the housing so that the stored filter body 120 can be fixed. To this end, in a preferred embodiment of the present invention, a structure in which the other end is closed by a pressure adjustment unit can be formed. there is.

However, in the present invention, a pressure adjustment unit 200 including a spring member is installed at the closed other end to adjust the pressure applied to the filter when removing the filter body 120, and for this purpose, a pressure adjustment unit 200 is installed at the closed other end. A boss portion with an opening may be installed to install the pressure adjustment unit 200, and a sealing member may be added to maintain airtightness in the boss portion.

Regarding the housing, according to a preferred embodiment of the present invention, the housing can be manufactured by injection molding using aluminum die casting. In particular, according to one embodiment of the present invention, a tab part that can be screwed on is formed on the inner lower side of a housing manufactured by aluminum die casting, and the screw structure of the base plate is directly fastened to this tab part. It can be provided in a form that is fixed. . Additionally, in order to prevent the housing from being deformed by pressure inside the cartridge, a clamping mechanism is installed around the outer circumference, and the housing and the base plate can be firmly fixed by the clamping mechanism.

According to a preferred embodiment of the present invention, a filter body 120 filled with a desiccant is located inside the housing 110. The desiccant filled in the filter body 120 may be a powder desiccant with a dehumidifying function, such as zeolite, or may be a structure impregnated with a desiccant. This desiccant fills the internal space of the filter body 120, and as the filter body 120 is pressurized by the spring member at the top, the density of the desiccant can be sufficiently increased.

As shown in FIG. 2, the air dryer cartridge according to a preferred embodiment of the present invention has a top-down structure in which a spring member is located at the top of the housing 110 to press the filter body 120 downward.

According to one embodiment of the present invention, the filter body 120 may be the entire container storing the desiccant. For example, the filter body 120 includes a generally cylindrical filter body container portion 121 and a filter body container portion ( It may include a filter body cover 122 that covers the opening of 121). The filter body cover 122 functions as a lid to prevent the desiccant from being discharged to the outside, and there is an outlet in the center that functions as an outlet port 172 so that the compressed air that has passed through the desiccant inside the filter body 120 can be discharged. can be formed. In addition, a sealing member 123 is inserted between the filter body container 121 and the filter body cover 122 to provide effective airtightness to the inside of the filter body, thereby preventing compressed air from moving through the gap through the normal path and leaving the filter body. It is possible to prevent inflow between the container portion 121 and the filter body cover 122.

Meanwhile, a pre-filter 140 may be installed inside the air dryer cartridge to primarily filter foreign substances such as oil. The pre-filter in the present invention may be a filter member installed upstream of the filter body 120 in which the desiccant is stored, that is, at a position before the compressed air passes through the desiccant (based on the step of supplying (processing) the compressed air).

This pre-filter 140 is used to adsorb and remove oil contained in compressed air, and may be, for example, an oil absorbent paper made of porous material, non-woven material, etc. However, this 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 it flows into the desiccant during the compressed air treatment process.

The filter body container portion 121 of the filter body 120 may have a cylindrical structure concentric with the cylindrical housing 110, and thus may form a gap between the filter body 120 and the cylindrical housing 110.

The gap between the housing and the filter body 120 is a passage through which compressed air flowing into the cartridge moves. Therefore, when processing compressed air, the compressed air introduced into the cartridge passes through this gap and moves to the desiccant side in the filter body container portion. On the other hand, when regenerating compressed air, the compressed air introduced into the cartridge may pass through the desiccant and be discharged to the outside through the gap.

Additionally, due to the gap, the filter body 120 may be separated from the housing while moving in the axial direction toward the open surface of the housing in a state in which the base plate is removed.

Meanwhile, according to one embodiment of the present invention, the pre-filter may be composed of an oil absorbent paper attached and fixed by a wrapping method, and a pre-filter holder 150 may be installed to effectively prevent the oil absorbent paper from being separated. You can.

In this example, a filter mounting portion may be formed in the filter body container portion so that the pre-filter 140 can be installed, and this filter mounting portion may be formed on the filter body so that the oil adsorbent constituting the pre-filter 140 can be easily wrapped. It may be formed on the small diameter portion of the container portion. The filter body container stores the desiccant inside, and it is desirable to maximize the storage volume of the desiccant in the filter body container in order to maximize the dehumidifying effect by the desiccant. To this end, the filter body container may be structured to include a large diameter portion having an outer diameter sufficiently close to the housing and a small diameter portion for seating the pre-filter 140.

A plurality of inlet holes may be formed in the small diameter portion to allow compressed air to flow into the desiccant side, and a filter mounting portion may be formed on the small diameter portion to support the pre-filter 140. In this way, the filter mounting portion may include a seating portion so that the filter can be seated and supported on the filter body container portion. Additionally, the filter mounting unit may include a pair of upper and lower guide units for guiding the wrapping of the pre-filter and limiting the vertical movement of the pre-filter 140. Therefore, the filter mounting portion in the filter cartridge according to a preferred embodiment of the present invention may include a seating surface formed along the circumference of the small diameter portion to enable the filter to be seated, and a pair of annular guide portions extending outward from the seating surface.

Therefore, the pre-filter 140 can be supported by the seating portion of the filter mounting portion, and especially in the compressed air treatment step, the pre-filter 140 can be prevented from retreating by compressed air flowing in from the gap inside the housing. .

In addition, a pre-filter holder 150 may be installed between the outer surface of the pre-filter 140 installed on the filter mounting part and the housing, and as shown in FIG. 2, this pre-filter holder 150 has an outer end in the outer circumferential direction. It may be in close contact with the inner surface of the housing, while the inner end may be in close contact with the outer peripheral surface of the pre-filter 140. Accordingly, the pre-filter can be supported toward the outside of the housing in the radial direction by the pre-filter holder 150. This pre-filter holder includes an arcuate support portion oriented in the outer circumferential direction toward the housing, and can support the pre-filter holder while contacting the housing by this arcuate support portion.

As previously defined, the term 'filter body' in this specification may be defined to mean a part that includes filters for dehumidification and/or removal of foreign substances and is replaceably installed in the housing. In particular, the term 'filter body' in this specification may, in a narrow sense, mean a filter body containing a dehumidifying agent in the example of FIG. 2, and in a broad sense, a filtering/dehumidifying device that can be removed as a whole with the pre-filter installed. It may mean the entire part.

Therefore, the filter body in the present invention can be defined as a general term for filtering or dehumidification-related parts that are independent and can be separated and removed within the housing.

A base plate 130 is installed at the bottom of the filter body 120 to couple with the housing 110 and fix the filter body 120 inside. The base plate 130 is located on the open side of the housing 110, and the base plate 130 functions as a cover of the open side of the housing 110. The base plate 130 partially closes the open surface of the housing 110 and restricts the movement of fluid in the remaining area of the base plate 130 except for the inlet port 171 and the outlet port 172 within the housing. can be sealed.

A fastening part with threads is formed around the outer circumference of the base plate 130, and this fastening part is screwed to the tab part inside the housing 110, thereby allowing the base plate to be fixed to the housing. Additionally, a first sealing member 161, such as an O-ring, is provided between the housing and the base plate, and the first sealing member 161 prevents compressed air from leaking to the outside. In addition, a second sealing member 162 may be provided to prevent compressed air leakage at a portion where the base plate 130 is connected to the filter body 120. As shown in FIG. 2, the second sealing member ( 162) may be composed of an O-ring provided between the base plate 130 and the filter body cover 122.

In particular, a preferred embodiment of the present invention is characterized by employing a tab portion inside the housing 110 and a screw fastening portion of the base plate 130. By applying this fastening structure, when replacing an air dryer cartridge, the end of the existing housing There is an advantage that the filter body can be attached and detached more effectively than the method of fastening the base plates by seaming.

The specific structure of the base plate 130 is not limited to that illustrated in FIG. 2, and is a structure that allows air inflow and outflow to enable treatment and regeneration of compressed air, and allows the filter body to be inserted or removed by opening and closing the open end of the housing. It can be applied without restrictions as long as it has a structure that can be screwed together with the housing tab part.

In addition, as shown in Figure 2, the air dryer cartridge according to a preferred embodiment of the present invention strengthens the binding force between the housing 110 and the base plate 130, while preventing the housing from being deformed by pressure inside the cartridge. To do this, a clamping groove 111 is formed on the outer surface of the housing 110, especially the radial outer surface of the housing tab portion, and the clamping mechanism 300 can be mounted on this clamping groove 111.

This clamping mechanism 300 may include a clamping ring 310 deformable in the radial direction of the housing in a band shape that can be seated in the clamping groove, and a coupling element 320 for fixing both ends of the clamping ring 310. You can. This coupling element 320 may include a bolt and a bolting groove, and as the bolt of the coupling element is sufficiently fastened to the bolting groove, the outer diameter of the clamping ring 310 is reduced to provide a clamping mechanism 300 on the outer surface of the housing. It is designed to be firmly fixed.

The clamping ring portion 310 is configured to be deformable according to the outer diameter of the housing while being retracted along the outer circumference of the housing, and is coupled while the clamping ring portion 310 is placed on the clamping groove 111 on the outside of the housing. By sufficiently fastening the bolt of the element 320 to the bolting groove, the clamping mechanism 300 can be fixed on the housing.

Through this configuration, the clamping mechanism 300 can provide a predetermined pressing force to the radial inside of the housing, and thus the housing 110 and the The coupling between the base plates 130 can be provided more firmly. Conversely, the clamping mechanism 300 may simply be used to suppress expansion of the housing, and in this case, no special pressing force may be provided to the housing 110.

Meanwhile, in the case of this clamping mechanism 300, it is effective for a housing including a tab part made of aluminum die casting and a base plate engaged with the housing tab part, and is effective for the aluminum housing, which is relatively weak compared to the steel housing manufactured using the existing deep drawing method. Even when using a screw connection method, effective airtightness and deformation prevention in response to internal pressure can be achieved, thereby maximizing mass production and ease of filter body replacement.

Since the air dryer cartridge 1 is typically mounted directly on the valve assembly of the air treatment system, the air dryer cartridge 1 may be provided with a fastening structure for mounting to the air treatment system. In this example, base plate 130 may include fastening structures for mounting directly to a valve assembly of a compressed air handling system.

Meanwhile, according to a preferred embodiment of the present invention, the filter body 120 must be assembled so as to be replaceable within the housing, and a pressure adjustment unit 200 is provided to adjust the pressure applied to the filter body 120 during assembly or replacement. ) includes.

In this regard, Figure 3 is an exploded perspective view showing the main components of a pressure adjustment unit for replacing a filter body in a cartridge for an air dryer according to a preferred embodiment of the present invention, and Figure 4 is an angle view of the pressure adjustment unit of Figure 3. This is a cross-sectional view of the components.

The pressure adjustment unit 200 of the air dryer cartridge according to the present invention is mounted and fixed on the housing 110 and can be inserted between the housing 110 and the filter body 120. This pressure adjustment unit 200 includes a main fixing bolt 210 that functions as a body fixed on the housing 110 and a sub-fastening bolt 260 fastened to a fastening groove formed at one end of the main fixing bolt 210. And it may include a stopper 250 that is inserted and fixed between the main fixing bolt 210 by the sub-fastening bolt 260. In addition, a spring member 230 and a movable plate 240 are inserted between the stopper 250 and the bottom of the boss portion of the housing 110, and the spring member 230 is compressible by the movable plate 240 on the inner side of the housing. can be supported.

With reference to FIGS. 2 to 4 , each component constituting the pressure adjustment unit 200 will be looked at in detail.

The main fixing bolt 210 may have a bolt structure including a main bolt head 211 and a main bolt body 212 extending axially below the main bolt head 211, and the main fixing bolt 210 is the main bolt body. A thread is formed on the outer surface of (212) and can be fixed through a screw connection to an opening formed in the boss portion on the upper side of the housing (closed end side). Additionally, a third sealing member 220 may be inserted between the bottom of the main bolt head 211 and the top of the boss portion of the housing 110.

A fastening groove 213 is formed in the center of the main bolt body 212 of the main fixing bolt 210, and the sub fastening bolt 260 can be fastened to and fixed to this fastening groove 213. The sub-fastening bolt 260 may have a bolt structure including a sub-bolt head 261 and a sub-bolt body 262 extending along the axial direction. In particular, the sub-fastening bolt 260 is fastened to the fastening groove 213 of the main fixing bolt 210 while the stopper 250 is located between the main fixing bolt 210, thereby directly fixing the stopper 250. In addition, the movable plate 240 and the spring member 230 can be supported via the stopper. A washer 270 may be inserted between the stopper 250 and the main fixing bolt 210.

The movable plate 240 is positioned upward so that movement toward the filter body is restricted by a stopper, while supporting one end of the spring member 230 and pressing the spring member upward. That is, the movable plate 240 can be configured to be able to move up and down within the housing, in contrast to the stopper 250, which is indirectly fixed to the housing through the main fixing bolt 210 and the sub fastening bolt 260. there is.

To this end, one side of the movable plate 240 may be provided to contact the filter body 120, and the other side may be provided to support and fix the spring member. The movable plate 240 is configured to move up and down while compressing the spring member 230. In particular, when a force pressing the filter body 120 is applied as the housing 110 and the base plate 130 are fastened, the movable plate 240 is pushed toward the housing boss portion by the force transmitted from the filter body, As the movable plate 240 moves, the spring member 230 may be compressed. When the fastening between the housing 110 and the base plate 130 is finally completed, the force transmitted to the movable plate 240 by the restoring force of the spring member presses the filter body 120 side and is stored inside the filter body. It functions to maximize the dehumidification effect by effectively compressing the desiccant.

For example, the movable plate 240 may have a hollow structure with a hole formed in the center, and may have a structure including flanges extending in the radial direction on the inner and outer surfaces of a cylindrical cylinder, respectively. Specifically, as shown in FIGS. 3 and 4, the movable plate 240 is formed with a plate outer flange 243 and a plate inner flange 244 extending toward the outside and inside, respectively, and the stopper 250 ) and may be provided to be in close contact with the spring member 230. In addition, a main bolt insertion hole 242 is formed in the center of the movable plate 240 to allow the main fixing bolt 210 to pass through, and a stopper 250 is formed around the main bolt insertion hole 242. ) may have a structure in which a plate groove 241 is formed to accommodate the

The stopper 250 may have a structure similar to the movable plate 240 and has a hollow cylinder structure with a hole formed in the center, and includes flanges extending in the radial direction on the inner and outer surfaces of the cylinder, respectively. It can be done.

For example, as shown in FIGS. 3 and 4, the stopper 250 has a structure including a stopper groove 251 so that the sub-fastening bolt 260 can be fixed as it is inserted, and thus the sub-fastening bolt 260 A subbolt insertion hole 252 may be formed so that the subbolt body 262 of 260 can pass through. In addition, the stopper 250 is provided to limit the movement of the movable plate 240 downward, that is, toward the filter body 120, and for this purpose, a stopper external flange 253 is formed extending in the outer radial direction of the stopper 250. ) may include. In addition, the stopper 250 is a stopper inner flange extending in the inner radial direction so that the movement of the stopper is restricted by the sub bolt head 261 and can be completely fixed between the main fixing bolt 210 and the sub fastening bolt 260. It may include (254).

In this regard, since the stopper 250 must be accommodated in the plate groove 241 of the movable plate 240, the radial outer diameter of the stopper 250 must be set sufficiently small compared to the outer diameter of the movable plate 240, However, the outer diameter of the stopper 250 must be set so that the outer flange 253 of the stopper 250 can push up the inner flange 244 of the movable plate 240.

In addition, the depth of the plate groove 241 of the movable plate 240 (height from the bottom of the inner flange of the plate to the bottom of the outer flange of the plate) is set sufficiently large compared to the height of the outer flange 253 of the stopper 250, so that the movable plate As 240 contacts the filter body 120, it can be configured to sufficiently pressurize the spring member 230.

Referring to FIGS. 2 to 4, the pressure adjustment unit 200 is based on a structure in which the stopper 250 is fixed between the main fixing bolt 210 and the sub fastening bolt 260 fixed to the housing. It is characterized in that it is fixedly mounted with the movable plate 240 and the spring member 230 inserted between the main bolt head 211 of the fixing bolt 210 and the stopper external flange 253 of the stopper 250, Through this structure, the movable plate 240, which can move up and down, selectively compresses the spring member 230, thereby providing appropriate force to the filter body when attaching or detaching the filter cartridge, or removing the provided force. It is structured so that

In the installation process of the pressure adjustment unit 200, first place the third sealing member 220 on the housing 110, fix the main fixing bolt 210 to the housing 110, and then secure the spring member. Insert the sub-fastening bolt 260 into the sub-bolt insertion hole 252 of the stopper 250 while inserting (230) and the movable plate 240 on the main bolt body 212 of the main fixing bolt 210. Afterwards, installation of the pressure adjustment unit 200 can be completed by inserting and fixing the sub-fastening bolt 260 into the fastening groove 213 of the main fixing bolt 210.

Meanwhile, a broken portion 214 in which a part of the main bolt body is removed may be formed in the main bolt body 212 of the main fixing bolt 210 for compressed air flow. This broken portion 214 functions to preferentially remove compressed air remaining inside when replacing the filter body, and can improve work efficiency during replacement. Therefore, when repairing an air dryer cartridge, when the main bolt head is rotated to first loosen the main fixing bolt 210 in order to replace the filter body, You can exhaust the compressed air first and then proceed with replacing the filter body. In addition, an engaging protrusion 255 may be formed on the stopper 250 to engage with the broken portion 214, and the engaging protrusion 255 of the stopper 250 may be engaged with the broken portion 214. . The broken portion 214 of the main fixing bolt 210 and the engaging protrusion 255 of the stopper 250 may be optionally provided to provide a function of effectively removing residual pressure inside the cartridge.

Hereinafter, the assembly process of the air dryer cartridge according to a preferred embodiment of the present invention and the operating state of the pressure adjustment unit during assembly will be described with reference to the attached drawings.

The attached FIGS. 5A to 5E are provided to explain the assembly process of the cartridge for an air dryer according to a preferred embodiment of the present invention, and FIGS. 6A and 6B are provided to explain the operating state of the pressure adjustment unit. Figure 6a is an enlarged view of area 'A' in Figure 5c, and Figure 6b is an enlarged view of area 'B' in Figure 5d.

When explaining the assembly process of the air dryer cartridge with reference to FIGS. 5A to 5E, first, as shown in FIG. 5A, the housing 110 is prepared, and the sealing member 220 is seated on the boss portion of the housing 110. Fasten the main fixing bolt 210 to the housing 110.

The boss portion of the housing 110 is closed by the main fixing bolt 210, and the remaining components of the pressure adjustment unit 200 are inserted into the housing 110, as shown in FIG. 5B. Complete the installation. More specifically, the spring member 230, the movable plate 240, and the stopper 250 are positioned on the main bolt body 212 of the main fixing bolt 210 protruding inside the housing 110, and the stopper 250 Installation of the pressure adjustment unit 200 can be completed by fastening the sub fastening bolt 260 penetrating the stopper groove 251 of ) onto the fastening groove 213 of the main fixing bolt 210. As mentioned above, the washer 270 can be inserted between the stopper 250 and the main fixing bolt 210.

When the pressure adjustment unit is installed as shown in Figure 5b, the main fixing bolt 210 is firmly mounted on the housing boss portion, and the sub fastening bolt 260 is firmly mounted on the main fixing bolt 210. Therefore, the two bolts, that is, the main fixing bolt 210 and the sub fastening bolt 260, are completely fixed on the housing. In addition, the stopper 250 is fixed between the main fixing bolt 210 and the sub-fastening bolt 260, so that the main fixing bolt 210, the sub-fastening bolt 260, and the stopper 250 are substantially connected to the housing ( 110) It is integrally fixed to the table. Meanwhile, the spring member 230 and the movable plate 240 are supported while inserted between the housing 110 and the stopper 250, so the spring member 230 can be compressed by the movement of the movable plate 240. It is set so that

Once the installation of the pressure adjustment unit 200 is completed, the filter body 120 is inserted into the housing 110 (FIG. 5C). At this time, the filter body 120 exerts a special force against the pressure adjustment unit 200. Since is not applied, the movable plate 240 of the pressure adjustment unit 200 is in the initial position, that is, in a state in which the inner flange 244 of the movable plate 240 is supported by the stopper 250, as shown in FIG. 6A. It can be maintained.

Afterwards, as shown in FIG. 5D, a process of coupling the base plate 130 to the housing 110 is performed. As described above, in a preferred embodiment of the present invention, a screwable tab portion is formed on the inner lower side of the housing to provide a structure of an air dryer cartridge with improved ease of assembly and replacement, while the base plate 130 A fastening portion having threads capable of being coupled to the tab portion is formed on the outer circumference of the tab portion of the housing 110 and the fastening portion of the base plate 130.

Prepare a first sealing member 161 and a second sealing member 162 for airtightness, and with each sealing member placed, the fastening portion of the base plate 130 is screwed to the tab portion of the housing 110 and fixed. . During this screw coupling process, the base plate 130 moves along the inner wall of the housing 110 toward the inside of the housing (in the upward direction in FIG. 5D), and at this time, the base plate 130 presses the filter body. As shown in FIG. 5C, the filter body is in close contact with the bottom of the movable plate 240 protruding from the bottom of the fixed stopper 250 and rises together by receiving a pressing force from the filter body 120. That is, as shown in FIG. 6B, the movable plate 240 moves in the direction of compressing the spring member 230 by the filter body 120, and accordingly, the spring member 230 moves the filter body 120. It remains compressed by a distance corresponding to . As a result, when the coupling of the base plate 130 and the housing 110 is completed, the spring force due to the compression of the spring member 230 is transmitted to the filter body, and this force causes the filter body 120 to be stored inside the filter body 120. The desiccant can be pressurized.

If the coupling between the base plate 130 and the housing 110 is completed as shown in FIG. 5D, the process of installing the clamping mechanism 300 proceeds as shown in FIG. 5E.

As described above, a clamping groove 111 is formed on the outer surface of the housing 110, and the clamping mechanism 300 can be mounted on the clamping groove 111. For example, with the band-shaped clamping ring 310 placed on the clamping groove 111 on the outside of the housing, the bolt of the coupling element 320 is sufficiently fastened to the bolting groove to tighten the housing 110. can be completed.

Meanwhile, replacement can be appropriately performed by performing the illustrated processes of FIGS. 5A to 5E in reverse order. However, as described above, when forming the fractured portion 214 in the main fixing bolt 210, a procedure for removing the internal residual pressure through the fractured portion 214 may be preceded. In this case, the main fixing bolt ( The procedure to remove residual pressure by rotating 210) can be carried out first. Of course, the overall replacement process after removing the residual pressure is the same as the reverse order of the existing assembly process.

In this assembly and replacement process, the pressure adjustment unit 200 and the combination between the housing tab portion and the base plate fastening portion can very effectively provide or recover the pressure applied to the filter body 120, thereby significantly improving workability. This is possible. In addition, the pressure adjustment unit 200 and the clamping mechanism 300 for reinforcing the coupling structure between the housing tab portion and the base plate fastening portion are realistic and very useful reinforcement means for the housing. This improved structure can enable the housing manufacturing process, which relied on deep drawing of steel plates, to be converted to aluminum die casting, and can greatly contribute to the mass production of air dryer cartridges and the recycling of parts.

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 described later.

1: air dryer cartridge 110: housing
120: Filter body 121: Filter body container portion
122: Filter body cover 123: Filter body sealing part
130: Base plate 140: Pre-filter
150: Pre-filter holder
200: Pressure adjustment unit 210: Main fixing bolt
211: main bolt head 212: main bolt body
213: Fastening groove
220: sealing member 230: spring member
240: Movable plate 241: Plate groove
242: Main bolt insertion hole 243: Plate external flange
244: Plate inner flange
250: stopper 251: stopper groove
252: Subbolt insertion hole 253: Stopper external flange
254: Stopper inner flange
260: Sub fastening bolt 261: Sub bolt head
262: Subbolt body 270: Washer
300: Clamping mechanism 310: Clamping ring portion
320: coupling element

Claims (10)

An air dryer cartridge for a compressed air handling system in a commercial vehicle, comprising:
A housing having a boss portion with an opening on one side and an open end on the other side;
a filter body stored inside the housing;
a base plate assembled to the open end of the housing to secure the filter body inside the housing; and
It includes a pressure adjustment unit installed in the boss part and provided to pressurize the filter body,
A tab portion is formed inside the open end of the housing, and a fastening portion that can be screwed to the tab portion is formed around the outer circumference of the base plate,
An air dryer cartridge, characterized in that the filter body is fixed inside the housing by coupling the tab portion of the housing and the fastening portion of the base plate.
In claim 1,
a clamping ring that is deformable in the radial direction of the housing; It further includes a clamping mechanism including a coupling element for fixing both ends of the clamping ring,
An air dryer cartridge, characterized in that the clamping mechanism is mounted on a clamping groove formed on the outer surface of the housing corresponding to the tab portion position.
In claim 2,
A first sealing member is inserted below the tab portion of the housing and the fastening portion of the base plate to provide airtightness between the housing and the base plate,
An air dryer cartridge, characterized in that a second sealing member is inserted between the base plate and the filter body.
In claim 1,
The pressure adjustment unit,
a spring member compressible to apply a spring force to the filter body; An air dryer cartridge comprising a movable plate that supports the spring member and moves as it comes into close contact with the filter body to compress the spring member.
In claim 4,
The pressure adjustment unit,
a main fixing bolt fixed to the boss part;
A sub-fastening bolt fixed to the main bolt body of the main fixing bolt; and
An air dryer cartridge further comprising a stopper inserted and fixed between the main fixing bolt and the sub-fastening bolt.
In claim 5,
A third sealing member is inserted between the main bolt head of the main fixing bolt and the housing boss portion,
The sub-fastening bolt is fastened to the fastening groove formed on the main bolt body of the main fixing bolt,
The stopper includes a subbolt insertion hole into which the subbolt body can be inserted, a stopper groove into which the subbolt head can be inserted, and a stopper inner flange formed on the upper inner surface of the stopper so that it can be fixed by the subbolt head. An air dryer cartridge comprising:
In claim 6,
The stopper further includes a stopper external flange extending from its lower outer surface,
The movable plate includes a main bolt insertion hole formed in the center, a plate groove into which the stopper can be inserted, a plate inner flange extending from an upper inner surface of the movable plate, and a plate outer flange extending from a lower outer surface of the movable plate. It comes true,
The stopper outer flange is configured to support the plate inner flange, and the plate outer flange is configured to support the spring member.
In claim 7,
The pressure adjustment unit,
Before coupling the housing and the base plate, the movable plate is maintained supported by the stopper external flange,
An air dryer cartridge, wherein when the filter body is stored inside the housing and the housing and the base plate are assembled, the movable plate leaves the stopper external flange to press the spring member.
In claim 7,
An air dryer cartridge, characterized in that the depth of the plate groove is greater than the height of the external flange of the stopper (250).
In claim 5,
A fractured portion is formed on the main bolt body of the main fixing bolt to form a flow path connected to the inside of the housing,
An air dryer cartridge, characterized in that an engaging protrusion that can be engaged with the broken portion is formed on the upper surface of the stopper.

Images