Air suspension dryer

Abstract

To provide an air suspension dryer that has a high degree of flexibility in installation, saves a space and is inexpensive.SOLUTION: An air suspension dryer D has: a housing body H having: an opening in which a drying agent S is held and into which external air flows; and an outlet port 52 from which air after a drying process by the drying agent S is discharged; and a lid member C1 that, while forming a chamber inside, covers an area where the opening of the housing body H is formed. An inlet port 51 from which external air flows into the chamber is formed at a position in the vicinity of a peripheral edge of the lid member C1. On an inner surface of the lid member C1, an air passage R is formed that extends from the inlet port 51 to the vicinity of an opposite peripheral edge of the lid member C1. A first water channel 11 and a second water channel 21 extending opposite directions are formed along the peripheral edge of the lid member C1 from a final end of an air flow passage R. A first drain port 12 is provided at an end of the first water channel 11, and a second drain port 22 is provided at an end of the second water channel 21.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a dryer for air suspensions that first removes some of the moisture contained in the air taken in through an inlet port, then dries the air using a desiccant held in a housing body, and supplies the resulting dry air to the air suspension through an outlet port. [Background technology]

[0002] Conventionally, such a dryer for an air suspension is disclosed, for example, in Patent Document 1 (see

[0008] to

[0011] and FIG. 1).

[0003] This air suspension dryer has an air inlet and an air outlet at both axial ends of a cylindrical housing, and a desiccant is held between a pair of filters housed inside the housing. Air taken in through the inlet is dried by the desiccant, and the dried air is discharged from the outlet and supplied to the vehicle's air suspension.

[0004] A filter and a guide member that supports the filter and the desiccant and guides air to the desiccant are provided upstream of the desiccant. The guide member has a recess in its center that temporarily receives the air taken in through the inlet, and a ring-shaped portion around the recess that has multiple openings that allow the air, whose flow direction has been changed by the recess, to flow to the desiccant. The total area of ​​the multiple openings is set to be equal to or greater than the opening area of ​​the inlet.

[0005] With this configuration, air taken in through the inlet collides with the recessed portion of the guide member to separate moisture, and then the air is guided to the opening of the annular portion, allowing for efficient drying. As a result, the dryer can significantly reduce the amount of desiccant it holds, and in particular, the axial dimension of the desiccant-containing portion of the housing can be significantly reduced. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-16669 Summary of the Invention [Problem to be solved by the invention]

[0007] In the conventional air suspension dryer described above, the guide member is located at the bottom of the dryer, and moisture that has been separated in advance by the collision of air is collected near the guide member and discharged. However, the structure for this discharge is not clearly defined.

[0008] This dryer can only be used with the guide members in their lowest position to ensure their effective function. Therefore, if the dryer is to be installed sideways, the separated moisture will flow into the desiccant through the opening located below the recess. Therefore, when using the dryer sideways, a separate exhaust flow path must be installed.

[0009] As a result, the dryer becomes complicated in structure and large in size, which reduces the flexibility of installation location and increases manufacturing costs.

[0010] In view of these circumstances, there has been a demand for an inexpensive air suspension dryer that can be installed with a high degree of freedom and requires less space. [Means for solving the problem]

[0011] (Features and configuration) The characteristic configuration of the air suspension dryer according to the present invention is as follows: a housing body that holds a desiccant therein and has at least one opening through which external air flows in and an outlet port through which air that has been dried by the desiccant is discharged; a cover member that covers the area of ​​the housing main body where the at least one opening is formed while forming a chamber therein; an inlet port through which the outside air flows into the chamber is formed in a position near a peripheral edge of the lid member, and an air flow passage is formed on an inner surface of the lid member from the inlet port to a position near the peripheral edge of the lid member located on the opposite side; the air flow passage is formed as a closed passage inside the chamber by a groove-shaped portion integrally formed in the lid member and a plate covering the groove-shaped portion, and has at least one bent portion along an extension direction of the air flow passage, a first water passage and a second water passage are formed extending in opposite directions from the end of the air flow passage along the peripheral edge of the cover member; A first drain outlet is provided at the end of the first water passage, and a second drain outlet is provided at the end of the second water passage.

[0012] (effect) The air suspension dryer of this configuration draws in external air from an inlet port and circulates it along an air flow passage formed on the inner surface of the lid member, separating some of the moisture contained in the air, and then supplies the air to the housing body and dries it using a desiccant. In this configuration, by placing a plate opposite a groove-shaped portion integrally formed in the lid member and partitioning the air flow passage, the moisture separation efficiency can be improved, and as much moisture as possible contained in the air taken in from the outside can be removed before the drying process using a desiccant. Furthermore, by providing the air flow passage with at least one bend, the air flowing therethrough has more opportunities to interfere with the walls of the air flow passage, making it easier to separate as water. Also, by providing a bend, the overall length of the air flow passage is extended, further increasing the opportunities for water to separate.

[0013] The cover member of this configuration is provided with an air flow passage, from the end of which a first water passage and a second water passage branch off, and a first drain outlet and a second drain outlet are separately provided at the end of each water passage.

[0014] With this configuration, two positions of the housing body can be selected to allow the water separated near the end of the air flow passage to be discharged outside the cover member. For example, two positions can be selected in which the extension direction of the air flow passage is tilted downward by 45 degrees from the horizontal. In each position, the first water passage or the second water passage extends further downward from the air flow passage, and the separated water can be discharged from the first drain outlet or the second drain outlet.

[0015] If two positions can be selected in this way, the arrangement of the air suspension dryer on the vehicle will be expanded, and the mountability on various vehicles will be improved.

[0016] Furthermore, in this configuration, since the air flow passage is formed in the lid member, the manufacturing process of the components and the installation work of the housing body and the lid member do not become complicated, and an air suspension dryer with excellent productivity can be obtained.

[0017]

[0018]

[0019] (Features and configuration) In the air suspension dryer according to the present invention, the cross-sectional area of ​​the air flow passage perpendicular to the direction in which the air flow passage extends can be made constant from the inlet port to the end point of the air flow passage.

[0020] (effect) By making the cross-sectional area of ​​the air flow passage perpendicular to the direction of extension constant as in this configuration, the flow velocity of the air flowing through the air flow passage is maintained constant, so that the air interferes with the wall of the air flow passage at bends and the like with a predetermined force, enhancing the water separation effect.

[0021] (Features and configuration) In the air suspension dryer according to the present invention, one air flow hole may be formed in the plate at a position corresponding to the end of the air flow passage.

[0022] (effect) In this configuration, a plate is used to form a closed air flow passage inside the chamber. The amount of water extracted in the air flow passage can be changed by appropriately setting the air flow condition in the air flow passage. Specifically, it is important to set the flow passage area, flow passage length, bend shape, etc. of the air flow passage.

[0023]

[0024]

[0025] In this configuration,By providing one air flow hole at the end of the air flow passage, the air flow distance inside the chamber can be increased when it flows through at least one opening connected to the desiccant housing, enabling further moisture extraction. This reduces the amount of moisture removed using the desiccant and improves the efficiency of the drying process.

[0026] (Features and configuration) In the air suspension dryer of the present invention, it is advantageous if a portion of the plate is clamped between a first protrusion protruding from a position in the air flow passage different from the wall of the groove-shaped portion and a second protrusion protruding from the housing main body, and the plate is held in a state where it is biased against the edge of the wall of the groove-shaped portion.

[0027] (effect) The plate abuts against the edge of the groove of the air flow passage to form a closed space as a flow passage. At this time, the plate must abut securely against the wall of the groove to maintain the airtightness of the air flow passage.

[0028] Therefore, in this configuration, a first protrusion is provided on a portion of the groove that is not a wall portion, and the plate is sandwiched between the first protrusion and a second protrusion provided on the housing main body. In this case, for example, by configuring the tip position of the first protrusion to be slightly lower than the height of the wall portion, the plate pressed by the second protrusion is forced into contact with the edge of the wall portion. Therefore, with an air suspension dryer configured in this way, the air flow passage is more tightly sealed and the plate is more stably attached. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is a perspective view showing the appearance and installation mode of an air suspension dryer; [Figure 2] FIG. 1 is an exploded perspective view showing the configuration of an air suspension dryer according to a first embodiment. [Figure 3] 1 is a cross-sectional view showing the configuration of a dryer for an air suspension according to a first embodiment. [Figure 4]1 is a cross-sectional view showing the configuration of a dryer for an air suspension according to a first embodiment. [Figure 5] FIG. 1 is an exploded perspective view showing the configuration of an air flow path according to a first embodiment; [Figure 6] An explanatory diagram showing the installation position of the air suspension dryer [Figure 7] FIG. 10 is an explanatory diagram showing another embodiment of the opening of the housing body; [Figure 8] FIG. 10 is an explanatory diagram showing another embodiment of the opening of the housing body; DETAILED DESCRIPTION OF THE INVENTION

[0030] [First embodiment] (overview) The appearance of a dryer D for an air suspension (hereinafter referred to as "dryer D") according to the present invention is shown in Figures 1(a) and 1(b). In Figure 1, a motor M is provided in association with the dryer D to take in air. A desiccant S is held inside the dryer D, and moisture contained in the air taken in from the outside is removed. The dried air is then supplied to the air suspension.

[0031] 1(a) and 1(b) show the dryer D rotated by 90 degrees. The dryer D of this embodiment has two drainage ports for discharging separated water, and can be installed at any desired angle.

[0032] 2 and 3, the dryer D includes, for example, a cylindrical housing body H and a first cover C1 and a second cover C2 attached to both ends of the housing body H. The first cover C1 is a lid member recited in the claims. As shown in FIG. 1, the first cover C1 and the second cover C2 are provided with flanges 31 for fastening bolts 3. The first cover C1 and the second cover C2 are aligned with both ends of the housing body H, and fastening bolts 3 are inserted into bolt holes 32 provided in the flanges 31, after which the housing body H is sandwiched and fixed between the first cover C1 and the second cover C2.

[0033] As a result, as shown in Figure 4, a first chamber 41 is formed between the housing main body H and the first cover C1, and a second chamber 42 is formed between the housing main body H and the second cover C2. The first chamber 41 is an area where some of the moisture contained in the taken-in air is extracted, and the second chamber 42 is an area where air that has been dried by the desiccant S is collected and supplied to the air suspension.

[0034] (Air flow passage) 2 to 4, an inlet port 51 for taking in air is formed on the surface of the first cover C1, and an air flow passage R for circulating the air taken in from the inlet port 51 is formed on the back surface of the first cover C1. The air flow passage R is configured in a tunnel shape by a groove portion 6 formed integrally with the back surface of the first cover C1 and a plate P that closes the groove portion 6.

[0035] 2, the air flow passage R extends from one peripheral edge of the first cover C1 to the other peripheral edge. Therefore, the inlet port 51 provided in the first cover C1 is located on the peripheral edge of the first cover C1 so as to be positioned at the end of the air flow passage R. The air flow passage R also has at least one bend R1 along the extension direction. In this embodiment, the bend R1 is located at the boundary between two linearly formed air flow passages R.

[0036] As in the present embodiment, the air flow passage R is formed as long as possible by extending from the peripheral edge of the first cover C1 to the other peripheral edge thereof. This allows the moisture contained in the air to come into contact with the walls of the groove portion 6 as it flows through the air flow passage R, thereby facilitating extraction.

[0037] Furthermore, by providing the air flow passage R with at least one bend R1, the air flowing therethrough has more opportunities to interfere with the walls of the groove portion 6, making it easier for the water to separate. Furthermore, the inclusion of the bend R1 further extends the overall length of the air flow passage R, increasing the opportunities for the water to separate. In this way, by setting the bend shape, flow path length, or flow path area of ​​the air flow passage R, the subsequent drying process using the desiccant S becomes more efficient, and air in a drier state can be obtained.

[0038] The plate P covering the groove portion 6 is, for example, substantially Y-shaped as shown in Figure 2. The outer periphery is positioned on the inner surface of the first cover C1, and part of the periphery is formed with a positioning hole P2 that is fitted onto the protrusion 23 formed on the housing main body H. Furthermore, a circulation hole P3 is provided at a position corresponding to the terminal end of the air circulation path R, through which air is discharged toward the housing main body H.

[0039] The opening area of ​​the circulation hole P3 is configured to be slightly smaller than the cross-sectional area perpendicular to the flow direction of the air flow passage R. This allows the flow velocity of the air discharged from the circulation hole P3 to be set high, causing the air to collide with the bottom 40 of the housing body H with force, thereby promoting separation of the water.

[0040] The shape of the through hole P3 is, for example, elliptical as shown in Fig. 2. This is to minimize the pressure loss of the air when it passes through the through hole P3. Incidentally, the shape of the through hole P3 may be a perfect circle, but by making it elliptical, the air discharged from the through hole P3 can easily flow along the extension direction of the partition portion 37. This maintains a high flow rate of the air coming into contact with the partition portion 37, further promoting water separation.

[0041] In this embodiment, one flow hole P3 is provided at the end of the air flow passage R. With this configuration, when the air flowing from this hole into the first chamber 41 flows through at least one opening 33 that communicates with the storage section of the desiccant S, a long flow distance can be ensured inside the first chamber 41, allowing for further moisture extraction. This reduces the amount of moisture removed using the desiccant S and improves the efficiency of the drying process.

[0042] The plate P is made of, for example, various metal materials. In this embodiment, the elasticity of the metal plate P is utilized to abut against the edge of the groove 6, thereby ensuring the airtightness of the air flow passage R. Specifically, a part of the plate P is sandwiched between a first protrusion 15 protruding from a position in the air flow passage R that is different from the wall of the groove 6, and a second protrusion 35 protruding from the housing main body H.

[0043] The first protrusion 15 and the second protrusion 35 are both rod-shaped portions, and the plate P is clamped between their respective tip surfaces. For example, the height of the first protrusion 15 formed inside the groove-shaped portion 6 is formed slightly lower than the height of the wall of the groove-shaped portion 6, and the plate P is fixed by the second protrusion 35 in a state in which it is lightly elastically deformed toward the first protrusion 15. As a result, the plate P is pressed against the edge of the wall of the groove-shaped portion 6, and the air flow passage R is configured like a sealed tunnel. Furthermore, this configuration ensures a stable mounting state of the plate P.

[0044] The plate P can be made of various resin materials in addition to metal materials. Any material can be used as long as it can reliably seal the edge of the groove portion 6 of the air flow passage R. A filler or adhesive may be applied between the edge of the groove portion 6 and the plate P, or an elastic material such as rubber may be interposed.

[0045] The cross-sectional area perpendicular to the direction in which the air flow passage R extends is constant from the inlet port 51 to the end point of the air flow passage R. This keeps the flow speed of the air flowing through the air flow passage R constant, and the air interferes with the wall of the air flow passage R at bends R1 and other parts with a predetermined force, enhancing the water separation effect.

[0046] 5 and 6, a first water passage 11 and a second water passage 21 (both shown by wavy lines) are formed in opposite directions along the periphery of the first cover C1 from the end of the air flow passage R. Furthermore, a first drain outlet 12 is provided at the end of the first water passage 11, and a second drain outlet 22 is provided at the end of the second water passage 21.

[0047] Specifically, the first water passage 11 and the second water passage 21 are arc-shaped grooves formed by joining the first cover C1 and the housing main body H. As shown in FIG. 3, these grooves are formed at positions corresponding to recessed space 38 surrounded by partition 37 and wall 36 of the housing main body H.

[0048] For example, in the state shown in Figure 4, air discharged from the air flow passage R through the flow hole P3 toward the housing main body H is ejected into a recess 38 between a wall 36 of the housing main body H and a partition 37 erected on the end face of the housing main body H, where moisture is separated. When the first cover C1 is in the state shown in Figure 5 or Figure 6(a), this moisture flows down by gravity through the first water passage 11 to the first drain port 12. As shown in Figure 6(a), when the air flow passage R is viewed from the front, the first water passage 11 formed from the flow hole P3 along the wall 16 of the first cover C1 is provided in an area with a central angle of approximately 45 degrees of the first cover C1.

[0049] The first drain port 12 opens into a drain recess 17 provided in the first cover C1 as an end of the first water channel 11. This drain recess 17 is formed by cutting out a portion of the wall 16 of the first cover C1. This drain recess 17 is connected to an in-wall flow path 18 provided inside the wall 16 of the first cover C1, and the in-wall flow path 18 is connected to a drain valve V. The drain valve V can discharge water to the outside of the dryer D at any time by, for example, changing the energized state.

[0050] As shown in Figures 5 and 6, a second water passage 21 extends from the position of the flow hole P3 on the opposite side to the first water passage 11. An example of using this second water passage 21 is shown in Figure 6(b). Figures 6(a) and 6(b) show phase states rotated 90 degrees from each other. A drain recess 27 is also formed in the first cover C1 at the end of the second water passage 21, and a second drain outlet 22 is provided therein. As shown in Figure 6(a), when the air flow passage R is viewed from the front, the second water passage 21 formed from the flow hole P3 along the wall portion 16 of the first cover C1 is also provided in an area of ​​approximately 45 degrees in terms of the central angle of the first cover C1.

[0051] In addition, the second drain outlet 22 is connected to an in-wall flow path 28, which is further connected to a drain valve V. As shown in Figure 6(a), the in-wall flow path 28 extending from the second drain outlet 22 merges with the in-wall flow path 18 extending from the first drain outlet 12 and then communicates with the drain valve V.

[0052] With this configuration, drainage is possible through the first water channel 11 or the second water channel 21 depending on the installation position of the dryer D. As shown in FIG. 6, two installation positions of the dryer D, which are approximately 90 degrees apart, can be selected, improving mountability in various vehicles. Furthermore, by providing two water channels for drainage, even if one water channel is frozen during operation, such as in a cold environment, drainage is possible through the other water channel, improving operational reliability. Furthermore, because the air flow passage R is formed integrally with the first cover C1, which is a lid member, the manufacturing process of the components and the installation work of the housing main body H and the first cover C1 are not complicated. Therefore, a dryer D with excellent productivity can be obtained.

[0053] (Housing body) As shown in FIGS. 2 and 3, the housing body H of this embodiment has a cup shape with a bottom and an opening 39 on one side. The bottom 40 faces the first cover C1. A desiccant S filled in a container of a predetermined shape, such as a cylindrical shape, is inserted into the opening 39. The container for the desiccant S is, for example, a mesh-like container that allows air to circulate inside the container. As shown in FIG. 4, a third cover C3 having multiple holes for holding the container may be provided on the side of the second cover C2. In addition to this example, a structure in which the desiccant S is directly placed inside the housing body H and a partition member with air vents is provided on the side of the second cover C2 may also be used.

[0054] 3 and 4, the bottom 40 is provided with a plurality of openings 33 through which air can flow. The openings 33 vary in size, for example, between those located near the center of the bottom 40 and those located in the peripheral portion. Here, the openings 33 in the peripheral portion are made larger. This is because air flow resistance tends to increase near the wall portion 36 of the housing main body H, so by making the openings 33 in this portion larger, the air flow becomes uniform in all portions.

[0055] A second protrusion 35 is provided at the center of the surface of the bottom 40 facing the first cover C1. This second protrusion 35, together with the first protrusion 15 provided on the first cover C1, clamps the plate P. A partition 37 is also provided on the bottom 40 to temporarily receive air that has passed through the circulation holes P3 of the plate P. As shown in FIG. 3, this partition 37 cooperates with a portion of the wall 36 to form, for example, a crescent-shaped recessed space. The protruding height of the partition 37 from the bottom 40 is set lower than the protruding height of the wall 36.

[0056] 4, the air discharged from the flow hole P3 is temporarily received in the recessed space, thereby providing a buffer function. At this time, the air flows along the extension direction of the partitions 37, and then, the air that has passed over each part of the partitions 37 flows toward each opening 33. By configuring the partitions 37 to have a predetermined length in this manner, it is possible to supply air evenly toward each part of the desiccant S.

[0057] 3, for example, a flange portion H1 is formed on the end of the housing body H on the side of the opening 39. This flange portion H1 abuts against the annular edge of the second cover C2. With this configuration, the structure of the housing body H is extremely simple. Alternatively, for example, granular desiccant S may be filled inside the housing body H, and a sealant having a large number of holes smaller than the outer diameter of the filler may be attached.

[0058] (Second cover) As shown in Figure 4, the air dried by the desiccant S is discharged into the second chamber 42 formed inside the second cover C2 and is further supplied to the air suspension through an outlet port 52 provided in the second cover C2. As shown in Figures 3 and 4, the outlet port 52 is formed in the center of the inner surface of the second cover C2.

[0059] In addition, the second cover C2 is formed with an annular wall portion 71 surrounding the outlet port 52. The height of this wall portion 71 is set so that it does not reach the container of the desiccant S, and a buffer effect is exerted by temporarily retaining the air that flows out from the container of the desiccant S outside the wall portion 71. This prevents the air that has flowed through a specific part of the desiccant S from preferentially heading toward the outlet port 52. In other words, the air that has passed through each part of the desiccant S is mixed outside the wall portion 71 to make the degree of drying uniform, and then the air passes over the wall portion 71 and flows into the outlet port 52.

[0060] When connecting the housing main body H to the first cover C1 and the second cover C2, it is advisable to provide alignment marks (not shown) or form recessed and protruding portions that fit together at a predetermined phase in order to align the rotational phases of the abutting parts.

[0061] In the dryer D having the above configuration, the air flow passage R is integrally formed with the first cover C1, resulting in a simple and compact structure. Furthermore, the first water passage 11 and the second water passage 21 extend in two directions from the air flow passage R, allowing the dryer D to be installed in two positions. As a result, a dryer D for air suspension has been obtained that is space-saving, inexpensive, and offers a high degree of installation flexibility.

[0062] Second Embodiment As shown in FIGS. 7 and 8(a) and (b), the shape of the opening 33 formed in the housing main body H can be changed as appropriate.

[0063] 7 shows an example of the openings 33 shown in FIG. 2, in which the insertion direction of the openings 33 is inclined with respect to the direction of the axis X of the housing main body H. Although the openings 33 in FIG. 7 appear to face the same direction, the insertion directions of the respective openings 33 are all different, and a swirling flow is formed around the axis X. With this configuration, the air that passes through the openings 33 flows in a spiral throughout the entire area filled with the desiccant S, thereby maximizing the moisture absorption effect of the desiccant S.

[0064] 8(a) and 8(b) show examples in which a plurality of slit-shaped openings 33 are formed radially from the center of the bottom 40. FIG. 8(a) shows curved openings 33, and FIG. 8(b) shows linear openings 33. In a cross-sectional view taken along a plane including the axis X, the wall surfaces of the openings 33 may be parallel to the axis X, or may be inclined relative to the axis X as in the example shown in FIG. 7. When the wall surfaces are inclined, the air passing through the openings 33 forms a strong swirling flow.

[0065] Furthermore, even if the insertion direction of the opening 33 is parallel to the axis X, a gentle swirling flow is generated. That is, the flow velocity of the air flowing in the peripheral region of the bottom 40 is reduced due to friction with the wall 36, and therefore the flow velocity of the air flowing near the center of the bottom 40 is relatively high. As a result, the direction of the air attempting to flow from the region of the opening 33 near the center toward the desiccant S changes toward the wall 36. Because the opening 33 is formed in a spiral shape relative to the center of the bottom 40, the air flows through the region of the desiccant S while drawing a gentle spiral.

[0066] Third Embodiment Although not shown, the air flow passage R may be configured from the inlet port 51 to the air flow hole P3 using a complete pipe-shaped member. For example, a pipe made of various metal materials or resin materials may be attached to the rear surface of the first cover C1.

[0067] With this configuration, the plate P can be omitted, and air leakage does not occur along the air flow passage R. Therefore, it is possible to obtain an air suspension dryer D that has an improved air drying effect while maintaining a relatively simple configuration. [Industrial Applicability]

[0068] The air suspension dryer of the present invention is provided with a desiccant inside and can be widely used as a dryer of the type that removes moisture from the air beforehand and then dries the air further with the desiccant. [Explanation of symbols]

[0069] 11 First waterway 12 1st drain 15 1st protrusion 21 2nd waterway 22 2nd drain 33 Aperture 35 2nd protrusion 51 Inlet port 52 Exit Port 6 Groove C1 Lid member D Air suspension dryer H Housing body P-plate P3 flow hole R Air flow passage R1 bend S Desiccant

Claims

1. a housing body that holds a desiccant therein and has at least one opening through which external air flows in and an outlet port through which air that has been dried by the desiccant is discharged; a cover member that covers the area of ​​the housing main body where the at least one opening is formed while forming a chamber therein; an inlet port through which the outside air flows into the chamber is formed in a position near a peripheral edge of the lid member, and an air flow passage is formed on an inner surface of the lid member from the inlet port to a position near the peripheral edge of the lid member located on the opposite side; the air flow passage is formed as a closed passage inside the chamber by a groove-shaped portion integrally formed in the lid member and a plate covering the groove-shaped portion, and has at least one bent portion along an extension direction of the air flow passage, a first water passage and a second water passage are formed extending in opposite directions from the end of the air flow passage along the peripheral edge of the cover member; A dryer for an air suspension, wherein a first drain outlet is provided at an end of the first water passage, and a second drain outlet is provided at an end of the second water passage.

2. 2. The air suspension dryer according to claim 1, wherein the cross-sectional area of ​​said air flow passage perpendicular to the direction of extension of said air flow passage is constant from said inlet port to the end point of said air flow passage.

3. A dryer for an air suspension as described in claim 1 or 2, wherein one air flow hole is formed in the plate at a position corresponding to the end of the air flow passage.

4. 4. A dryer for an air suspension as described in claim 3, wherein a portion of the plate is clamped between a first protrusion protruding from a position in the air flow passage different from the wall portion of the groove-shaped portion and a second protrusion protruding from the housing body, and the plate is held in a state where it is biased against the edge of the wall portion of the groove-shaped portion.

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