MXPA98003364A - Air desert bottle for a brake system of a - Google Patents

Abstract

A desiccant canister for an air brake system having double internal airflow paths, and an element for preventing localized compression of the molecular desiccant sieve. The present invention provides a rotating canister having an inner cover spring loaded inside an outer cover. The inner cover contains the molecular decay sieve. To increase the internal flow path without increasing the outer size of the can, a shield plate is provided inside the inner cover, to divide the molecular sieve into an outer annular chamber and an inner core of an approximately equivalent flow dimension. Accordingly, the air that is to be dried can make a pass through a flow path, and then another passed through another flow path. To avoid localized compression of the molecular sieve, the inner cover is spring loaded inside the outer cover, and cooperates with a sliding screen plate to effect balance. In the preferred embodiment, an elastomeric cushion is provided inside the inner cover to further distribute the force of the spring uniformly throughout the entire molecular sieve.

Description

AIR DESERT BOTTLE FOR AN AIR BRAKE SYSTEM Field of the Invention The present invention relates generally to air brakes, and more particularly relates to the air supply system for vehicle air brakes.

Background of the Invention Freight transport is commonly carried out with tractor-trailer trucks. Given the heavy loads typically drawn by these trucks, mechanical brake systems can not stop trucks within an acceptable distance and, consequently, air and hydraulic brakes have largely supplanted these mechanical brake systems. Although a hydraulic brake system can provide pressurized hydraulic fluid along the lines of hydraulic fluid from a central source to the multiple wheels of the vehicle and, therefore, stopping the vehicle faster than mechanical systems is particularly susceptible to contamination . More specifically, when a trailer is uncoupled from a given tractor, and it is replaced with another trailer, the hydraulic fluid lines must be decoupled, resulting in an opportunity for dirt, water or other contaminants to enter the system. This contamination will necessarily result in decreased brake performance due to corrosion, abrasion or the like. Furthermore, should a hydraulic line or coupling become damaged, the hydraulic fluid will escape and will require costly cleaning and will cause an environmentally unfavorable situation. Consequently, air brakes have become the system of choice for cargo transport trucks. With this air system a central source of compressed air is provided which communicates pressurized air along the ducts to the individual components of the brake. Unlike the cost and environmental drawbacks associated with hydraulic systems, if an air line or coupling fails, expensive cleaning is not required. However, air brake systems still require elements to prevent contaminants from entering the system. The contaminant of most concern is humidity. If water is allowed into the system, the brakes will rust and eventually fail. Accordingly, prior art systems provide a desiccant to remove moisture from pressurized air. More often, a molecular sieve comprised of a compound that can adsorb moisture when the air passes through the desiccant is provided. Periodically, a portion of the dried air is purged back through the molecular sieve to remove moisture from it. Over time, the molecular sieve breaks down and / or becomes contaminated with the oil derived by the compressor, requiring it to be removed and the bag containing the desiccant replaced. This system is not only slow and dirty, it also requires the operator of the vehicle to remember to change the desiccant bag at the appropriate points. More recently, the desiccant has been provided in a replaceable rotating canister similar to those used for conventional oil or fuel filters. As mentioned above, a purge cycle is periodically used to remove the adsorbed water from the desiccant and, consequently, to recondition the desiccant for other cycles. An example of a rotary desiccant filter is provided in U.S. Patent No. 4,733,449, which discloses an elongated can having an annular outer chamber and a cylindrical core. An adsorbent material fills the outer chamber, so that incoming air (eg, from a compressor) enters the external chamber, passes through the adsorbent material, and then passes to the outlet through the inner core.

Although the rotating boats are more easily replaceable and have been well received by the industry, the amount of moisture that can be removed depends on the length of the flow path through the desiccant. Since the "footprint" or space available for the boat is finite, the size of the boat can not be increased to alleviate this problem. Moreover, it has been discovered that, after prolonged use, the molecular sieve granules tend to compress in certain areas inside the can and, consequently, are distributed sparingly in other areas, due to the cycle and the purging of the pressurized air. Consequently, the less compressed areas can move as a result of the air that cycles, and cause abrasion and eventually the creation of fine dust. Then the dust serves as a contaminant that can wear out against the brake elements themselves, and possibly cause the brakes to fail.

SUMMARY OF THE INVENTION Accordingly, it is a primary objective of the present invention to provide a top desiccant canister having a conventional external size, but a greater internal airflow path. It is another primary objective of the present invention to provide a desiccant can that can limit localized compression of the molecular sieve granules, thereby avoiding abrasion and the creation of contaminating dust. It is an object of the present invention to provide a desiccant canister to reliably provide a two-pass flow through the desiccant, and also having bidirectional airflow paths, to allow one cycle to remove moisture from the air, and another cycle purge the moisture adsorbed from the desiccant. It is another object of the present invention to provide an efficient method for the cost to manufacture a desiccant canister, having an element for capturing a molecular sieve inside the can, while still making it possible for the air to pass through it. In accordance with these objects, it is a feature of the present invention to provide a can that has an open end, a closed end, and a cylindrical side wall, with a molecular sieve disposed therein, and a shield plate attached to the open end. , and that divides the molecular sieve into coaxial and oppositely directed flow paths of an approximately equal dimension. The screen plate includes a disc and an integral tube, in such a way that an external annular chamber and an internal cylindrical chamber are created inside the can. In one embodiment, the air to be dried enters through the central cylindrical chamber, and passes around the integral tube to the outer annular chamber before leaving the can. Accordingly, the airflow path effectively doubles within an external canister of a conventional size. It is another feature of the present invention to provide the molecular sieve inside an inner casing spring loaded inside an outer casing. The inner cover includes a closed end, an open end which is closed by the screen plate, a cylindrical side wall and a molecular sieve. An elastomeric cushion proximate the closed end of the inner cover is provided to evenly distribute the compression from the spring between the inner and outer covers throughout the molecular sieve. Any compressed areas press against the elastomeric cushion, causing the cushion to bypass this force to move the shield plate relative to the inner cover. This movement allows the molecular sieve to reach an equilibrium, where the compression is uniform, and the aforementioned localized compression and the creation of abrasive powder are eliminated. It is still another feature of the present invention to provide a desiccant can made in accordance with a method that provides inner and outer covers, and a synthetic fabric that is molded directly into the inner cover to thereby capture the molecular sieve inside the internal cover, while it is still possible for air to pass through it. It is still a further feature of the present invention to provide a desiccant canister having first and second bidirectional joint flow paths. The inlet for the air to be dried, therefore, can serve as the outlet for the purge air, and according to the above, the outlet for the dried air can serve as the inlet for the purge air. These and other objects and features of the present invention will become clearer from the following detailed description, when taken in conjunction with the accompanying drawings.

Brief Description of the Drawings Figure 1 is a partial sectional view of a filter exemplifying the present invention, which shows the air flow paths during a drying cycle. Figure 2 is a partial sectional view of the filter of Figure 1, showing the air flow paths during a purge cycle. Figure 3 is an end view of the filter. Figure 4 is a sectional view of the inner cover containing the molecular sieve, and showing the synthetic fabric barrier. Figure 5 is an end view of the inner cover shown in Figure 4. Figure 6 is a part separated view of the filter of Figure 1, showing the manufacturing method. Although the present invention is susceptible to different modifications and alternative constructions, certain illustrative embodiments thereof have been shown in the drawings, and will be described later in detail. However, it should be understood that there is no intention to limit the invention to the specific forms disclosed, but on the contrary, the intention is to cover all modifications, alternative constructions, and equivalents that fall within the spirit and scope of the present invention, as defined by the appended claims.

Detailed Description of the Preferred Modality Referring now to Figure 1, a desiccant filter is shown which illustrates the principles of the present invention. The filter takes the form of a can 20 which is shown with the outer cover 22 partially cut away to reveal the invention in cross section. As can be s in addition to the outer cover 22, the canister 20 includes an inner cover 24 received inside the outer cover 22, the base plate 26 for capturing the inner cover 24 inside the outer cover 22, and the spring 28 to force the inner cover 24 towards the base plate 26. The desiccant material 30 is contained within the inner cover 24. The specific details of each of the aforementioned elements will be discussed with greater emphasis herein, but, starting from of Figure 1, it will be clear to one of ordinary skill in the art, that the present invention greatly improves upon the prior art, by effectively duplicating the air flow path through the desiccant 30, while providing a simple and reliable construction . In one implementation, the air to be dried enters desiccant 30 at inlet 32, and communicates through the first flow path indicated by arrow 34, and then redirected along the second path flow 36 before exiting through outlet 38. Opposite to prior art systems, which only provide a linear path through a can of relatively equal length, the present invention greatly extends the flow path without increasing the external trace of the boat. The present invention, therefore, provides a greater drying capacity within the limitations of finite space of the vehicle in which the boat will be mounted. Moreover, as shown in Figure 2, the present invention can also employ a purge cycle to periodically remove adsorbed water from desiccant 30. In practice, this means that air is communicated through outlet 38 in the direction indicated by the arrow 40 to blow the adsorbed water from the desiccant 30 and out through the inlet 32 in the direction indicated by the arrow 42. In addition to increasing the drying capacity of the can 20, the elongated flow paths The bi-directional agents of the present invention also increase the working life of the canister 20, by decreasing the amount of desiccant that is contaminated by the oil passing through the desiccant. Returning now to the specific details of each element of the present embodiment of the invention, Figure 4 shows the inner cover 24 in cross section. As shown therein, the inner cover 24 includes a closed end 44, an open end 42, and a cylindrical side wall 46. The cover can be easily formed by a conventional stretching operation. The chamber created in this way is filled with the desiccant 30, and closed with the scrplate 48. In the preferred embodiment, and for the purposes to be described later, an elastomeric cushion 50 proximate the closed end 44 is provided. The particular type of desiccant used in the preferred embodiment is a conventional granular type substance, such as aluminosilicate. In the alternative modalities, the specific type of desiccant used will vary, but basically it will be a molecular sieve that is a material that has affinity to collect certain types of molecules in the outer layers of its structure. In oversimplification, a molecular sieve has many of the same properties as sand, is chemically inert, and poses no risk to the environment or health. In accordance with the objective of increasing the flow path for the air to be dried, without increasing the overall size of the can 20, the desiccant 30 is divided into the first path of the flow., and the second flow path 36, by the cylindrical tube 52. In the preferred embodiment, the cylindrical tube 52 is integrally molded in the disc 54. By manufacturing the tube 52 in such a way that its length is less than the length of the tube. inner cover 24, the first flow path 34 may communicate with the second flow path 36 proximate the closed end 44. Simply increasing the length of the flow path, will not necessarily increase the capacity of the desiccant filter to dry the air that Cycle For example, if the flow path lengthens in a significant way, but the diameter, area, or resulting volume of the flow path decreases significantly, the overall drying capacity will suffer. Accordingly, it is a feature of the present invention that the ratio of the length to the diameter of the flow paths is maintained between the minimum and maximum proportions. Put another way, the preferred embodiment of the present invention includes at least twenty-five (25) percent of the total volume of the desiccant granules 30 within each of the first and second flow paths 34 and 36, respectively. In this aspect, the flow paths of the preferred embodiment include approximately equal dimensions. Turning now to Figure 4, the disk is shown 54 secured to the open end 42 of the inner cover 24, to capture the desiccant 30 therein. As best shown in Figure 5, the disc 54 of the preferred embodiment is provided with a plurality of inlet openings 56 disposed in an annular configuration around the outer circumference of the disc 54, and a plurality of outlet openings 58 disposed therein. a circular configuration in the center of the disk 54. Alternatively, the inlet openings may be provided around the center of the disk 54, the outlet openings being provided around the periphery of the disk. The air to be dried enters the inner cover 24 through the inlet openings 56, and then into the first flow path 34. In a similar manner, the dried air leaves the second flow path 36 through the air. of the exit openings 58, to communicate to the braking system (not shown). As is conventional, disc 54 includes a plurality of radially extending support ribs 60 to provide structural integrity to disc 54. Since desiccant 30 is a molecular sieve (aluminosilicate having a granule size of 8 to 12 mesh in the preferred embodiment), an element must be provided to capture the desiccant inside the inner cover 24, while still making it possible for the air to pass through it. To accomplish this, the present invention includes a synthetic fabric barrier 62 through inlet openings 56 and outlet openings 58. Synthetic fabric barrier 62 in the preferred embodiment is a nylon shape that includes orthogonally oriented fibers that allow air to pass through them, but are dense enough (1 to 2 microns in the preferred embodiment) to prevent passage of the desiccant 30. If it were not for the synthetic fabric barrier 62, the individual granules of the desiccant 30, or a portion of the granules, could escape from the inner shell. 24, and migrate to the braking system, to cause abrasion and premature brake failure. Another patentable feature with respect to the synthetic fabric 62, involves the manner in which it is associated with the screen plate 48. In the preferred embodiment, the screen plate is made of injection molded plastic. In order to secure the fabric 62 through the disc 54, the fabric 62 is placed in the mold used to make the screen plate before the injection of the molten plastic. When the hot plastic is injected into the mold, the hot plastic permeates the edges of the fabric 62, so that when the plastic is cooled and hardened, the cloth is fastened to the screen plate without the need for external fasteners . An advantage of this system is that, by embedding the fabric 62 directly in the disc plastic 54, the fabric is reliably held in place during both the drying and purge cycles. If the fabric were simply attached to one side of the disc, the bond between the disc and the fabric could be auxiliary in one direction, but it could tend to pull away from the disc when the airflow reverses the direction. By embedding the fabric directly in the plastic, this problem is eliminated, and a more reliable filter is created. It is also important to note that the disc 54 includes an annular edge 64 around its outer periphery which is in sliding contact with the inner surface 65 of the inner cover 46. After the desiccant 30 is deposited inside the inner cover 24, the the screen plate 48, complete with the synthetic fabric 62, can be pressed into the inner cover 24, until the edge 64 is placed close to the rim 66 of the inner cover 24. Then the flange 66 curls inward to retain the plate of screen 48 inside the inner cover 24, but, given the sliding contact between the edge 64 and the internal surface 65, the screen plate is provided with a limited degree of movement. The inner cover, the screen plate and the desiccant, therefore, can be assembled previously as a complete package, before being inserted into the outer cover 22, as will be discussed in more detail herein. As mentioned above, a problem with prior art desiccants is that the desiccant may include localized compression areas, due to the wet air cycle and purge air. In areas of localized compression are accompanied by areas of loose compression, which allow individual granules to rub against each other. This abrasion can eventually lead to the formation of dust, which can then be communicated to the braking system and cause wear and brake failure. This situation is even more problematic when the molecular sieve is divided by an internal screen that limits the movement of the sieve granules between the flow paths. To alleviate this problem, the present invention provides a system wherein the spring 28 cooperates with the sliding screen plate 48 to provide uniform compression of the granules of the molecular sieve 30. The effect of the spring 28 is most noticeable when a spring is used that has a relatively high compression force. In the preferred embodiment, the spring 28 exerts 68 kilograms of force. To further improve this uniform distribution, one embodiment of the present invention includes the elastomeric cushion 50 which is positioned adjacent the closed end 44, as will be discussed in more detail herein. Closed end 44 further includes recess 68 to partially receive spring 28. To fully appreciate the manner in which the present invention eliminates localized compression of desiccant 30, reference is again made to Figure 1.

As shown therein, the spring 28 forces the inner cover 24 towards the base plate 26. Accordingly, the inner cover is basically suspended, or floated, inside the outer cover 22. Moreover, when placing the plate of screen 48 in a non-fixed sliding contact with the inner surface 65 of the inner cover 46, the screen plate 48 can move in response to the compression of the spring 48. For example, if the desiccant 30 is evenly distributed through of the entire inner cover 24, the spring 28 will compress the inner cover evenly, and will move the screen plate 48 relative to the inner cover 24 uniformly across its planar axis. However, if a desiccant area 30 becomes more compact than the other areas, the force of the spring 28 will cause the screen plate 48 to move relative to the inner cover 24 in a non-uniform manner, corresponding to the relative compaction. of the desiccant granules 30 inside the inner cover 24. Put another way, the spring 28 will cooperate with the sliding arrangement of the display plate 48 to move the display plate 48 further inside the inner cover in the areas of compression lower than in the higher compression areas. In this situation, the disc 54 of the screen plate 48 will not be arranged orthogonally in relation to the cylindrical wall 46 of the inner cover 24, as shown in Figure 1, but will rather be slightly offset in relation to the same. . In the preferred embodiment of the present invention, this effect is enhanced by the provision of the elastomeric cushion 50 adjacent to the closed end 44 of the inner cover 24. The force of the compacted region pressing against the cushion 50, causes the elastomeric cushion to deviate the return force and consequently, causes the screen plate 48 to move relative to the inner cover 24. Since the screen plate 48 does not rigidly attach to the inner cover 24, but rather is floating in relation to with it, and only stops therein by the rim 66, the screen plate can move in response to the deflection of the cushion 50. The final result of this is that the areas of loose compression will become more compact, allowing that the areas of high compression loosen, and in this way the compression is equalized throughout the molecular sieve. Another feature of the present invention illustrated above is the provision of a desiccant canister with a rotating capacity, to facilitate relatively easy removal and replacement. This function is performed largely through the base plate 26, which has been briefly discussed in the foregoing, but will now be described with particular reference to Figure 2. The base plate 26 in the preferred embodiment is a shaped structure. of disk having a plurality of openings 70 communicating with the openings 34 of the display plate 48, and a central opening 72 in communication with the openings 36 of the display plate 48. As shown in Figure 1, the Outlet opening 72 is provided with internal threads 74 which are adapted to join a threaded fitting provided in a vehicle. In this aspect, the present embodiment, therefore, is similar to conventional rotary oil or fuel filters, which can be easily removed and replaced. Unlike the plastic construction of the screen plate 48, the base plate 26 is made of metal, of steel in the preferred embodiment. It is important to note that the base plate 26 does not rigidly attach to the outer cover 22, but rather stops inside the outer cover 22 by the annular ring 76, which curls on the edge 79 of the outer cover 22. This construction facilitates the efficient assembly of the can 20, as will be further discussed herein. The annular ring 76 includes a groove 78 adapted to partially receive the sealing pack 80. As is conventional, the package 80 will be compressed against the vehicle when the canister 20 is secured thereto to provide an effective seal against contamination and pressure loss. As shown in Figure 1, a second gasket 82 is provided between the base plate 26 and the screen plate 48. The gasket 82 is provided to separate the air flowing in from the can 20, from the dried air flowing outwardly. of the can 20, and conversely, the purge air that flows into the can, of the purged air that flows out of the can. As a result of the aforementioned elements, the method by which the present invention is assembled is indirect, and is adapted for a prior assembly of certain components. For example, as discussed above, the synthetic fabric barrier 62 is injection molded into the screen plate 48, and after the desiccant 30 is deposited in the inner cover 24, the screen plate 48 is inserted into the cover internal 24, until the edge 64 passes the ridge 66, and is retained therein to form a pre-assembled cartridge 90. Therefore, pre-assembled cartridges can be assembled off-line, in a manner similar to how they are preformed. Pleated paper filter elements before assembling on rotating oil filters. It is also important to note that the cylindrical tube 52 includes beveled tips 53 to facilitate insertion of the screen plate 48 into the desiccant 30. Referring now to Figure 6, it can be seen that the previously assembled cartridge 90 can then be inserted into the the outer cover 22 to form a finished can 20. More specifically, the package 82 is placed on top of the base plate 26, the previously assembled cartridge 90 is placed on top of the package 82, the spring 28 is placed on top of the cartridge 90, and then the outer cover 22 is placed lowering on the cartridge 90 on the base plate 26. The force of this movement compresses the spring 28 to the point where the edge 79 of the outer cover 22 comes into contact with the base plate 26. The annular ring 76 is then crimped or rolled on the edge 79 by a conventional welding operation. To terminate the can 20, the package 80 fits into the groove 78 of the annular ring 76. Then the canister 20 is able to threadably attach to a vehicle employing an air brake system, and can safely withstand a pressure of relatively high air. From the foregoing, one of ordinary skill in the art can appreciate that the present invention brings to the art a new and useful desiccant canister for use with an air brake system. Through the use of a novel screen plate design, the present invention greatly increases the length of the air flow path through the can, without increasing the outer size of the can oval. Through the use of an internally threaded base plate, the present invention can be threadably attached to a vehicle to allow easy repair and replacement. Moreover, through the use of a floating inner shell and an elastomeric cushion, the compression of the molecular sieve inside the inner shell is kept in balance to eliminate in this way the creation of desiccant dust, which could contaminate the braking system . In addition, the method by which the present invention is assembled makes it possible for certain elements to be assembled in advance, and for the entire can to be manufactured in a fast and efficient manner.

Claims (20)

1. NOVELTY OF THE INVENTION Having described the foregoing invention, it is considered as a novelty and, therefore, the content of the following is claimed as property: CLAIMS 1. An air desiccant canister for an air brake system, comprising: an outer casing having an open end, a closed end and a cylindrical side wall, a particulate desiccant filling substantially the inner casing; a screen plate having a disk and a cylinder integrally formed with, and projecting from, the disk, the screen plate being slidably fitted inside the open end of the inner cover, such that the cylinder divides the desiccant into a path of external annular flow and an internal cylindrical flow path, the flow paths being of an approximately equivalent size, the disk having formed therein openings in communication with the internal chamber, and openings in communication with the external chamber; a base plate connected to the open end of the outer cover, and cooperating with a spring provided between the closed end of the inner cover and the closed end of the outer cover to capture the inner cover therebetween in a floating arrangement, moving the spring to the inner cover in relation to the screen plate in proportion to the relative compaction of the particulate desiccant, the base plate having openings in communication with the apertures of the screen plate, and an internal, internally threaded aperture, adapted for a threaded connection of the boat with an air brake system.
2. 2. The air desiccant canister according to claim 1, characterized in that it further includes an elastomeric cushion disposed proximate to the closed end of the inner cover to distribute the compression of the spring uniformly through the desiccant.
3. 3. The air desiccant can according to claim 1, characterized in that an annular seal is provided between the screen plate and the base plate to separate the inlets from the outlets.
4. 4. The air desiccant canister according to claim 1, characterized in that a synthetic fabric is provided on the screen plate to allow the passage of air, and to prevent the desiccant from passing through it. .
5. 5. The air desiccant canister according to claim 4, characterized in that the synthetic fabric is embedded directly on the screen plate during injection molding.
6. 6. An air desiccant canister to be supported within an external housing by spring pressure on a housing base, which comprises: a housing having an open end, a closed end, and a side wall therebetween; a desiccant medium that substantially fills the housing; a screen plate in sliding contact with the open end of the housing, and dividing the desiccant, such that a first air flow path is established, and a second coaxial air flow path through the desiccant.
7. 7. The air desiccant canister according to claim 6, characterized in that the first flow path and the second coaxial flow path are of approximately equivalent dimension.
8. 8. The air desiccant canister according to claim 7, characterized in that the side wall of the housing is cylindrical, and the display plate includes a disk and an integral cylinder, the inlet to the can being provided through the disk on the inside of the boat, the output of the boat being provided through the screen plate on the outside of the cylinder.
9. 9. The canister of air desiccant according to claim 7, characterized in that the desiccant is a molecular sieve in granules.
10. 10. The air desiccant canister according to claim 7, characterized in that the housing is disposed inside an outer cover having an open end, a closed end, and a cylindrical side wall, a spring compressing between the closed end wall of the housing, and the closed end of the outer cover, by a base plate connected to the open end of the outer cover, the base plate having an internal opening, internally threaded, adapted to be threadably attached to the brake system of a vehicle.
11. 11. The air desiccant canister according to claim 10, characterized in that an elastomeric cushion proximate the closed end of the inner cover is arranged to distribute the compression of the spring uniformly through the desiccant.
12. 12. The air desiccant canister according to claim 7, characterized in that a synthetic fabric is provided through the screen plate to allow the passage of air, and to prevent the passage of the desiccant through the same 13.
13. The air desiccant canister according to claim 12, characterized in that the synthetic fabric is embedded directly on the screen plate during injection molding.
14. A method for manufacturing an air desiccant can, which comprises the steps of: depositing a predetermined amount of molecular desiccant inside an inner casing having an open end, a closed end, and a cylindrical side wall; slidably inserting a screen plate having an end disk and a tube formed integrally with the disk inside the open end of the inner shell, and thereby dividing the desiccant into first and second flow paths of approximately equivalent dimension, the first flow path being in communication with the second flow path; placing the inner cover on top of a base plate that has an internal opening, threaded internally; place a spring on the closed end of the inner cover; Place an outer cover over the spring and the inner cover, and compress the spring until the open end of the outer cover makes contact with the base plate, the sliding coupling cooperating between the screen plate and the inner cover with the spring to allow the relative movement between the screen plate and the inner cover, in order to maintain in this way a uniform compaction of the desiccant inside the inner cover; and join the open end of the outer cover to the base plate.
15. 15. The method according to claim 14, characterized in that it also includes the step of inserting an elastomeric cushion into the inner cover before depositing the molecular desiccant.
16. 16. The method according to claim 14, characterized in that the screen plate is made of injection molded plastic, and also includes the step of molding a synthetic fabric on the screen plate, to contain in this way the molecular desiccant inside the inner cover.
17. 17. The method according to claim 14, characterized in that it also includes the step of placing an annular seal between the base plate and the screen plate.
18. 18. The method according to claim 14, characterized in that it further includes the step of attaching an annular seal to the open end of the outer cover next to the base plate to provide a seal between the can of air desiccant and a machine to which the air desiccant canister is threaded.
19. 19. The method according to claim 14, characterized in that the joining step is carried out by welding the external cover to the base plate.
20. 20. The method according to claim 14, characterized in that the inner cover, the molecular desiccant, and the base plate are pre-assembled before being inserted into the outer cover.