Dryer and air supply unit

Abstract

The utility model provides a dryer and an air supply unit. The dryer comprises two drying cylinders arranged in parallel, two air inlet assemblies and an air outlet assembly. The drying cylinder has an inner cavity; the two air inlet assemblies are arranged on the two drying cylinders correspondingly and communicate with inner cavities of the two drying cylinders correspondingly. The air outlet assembly comprises a collecting piece and a connecting piece with an air channel, and the collecting piece is connected with the two drying cylinders. The collecting piece is provided with a collecting cavity with one end open, at least part of the connecting piece is filled into the collecting cavity, and the collecting cavity communicates with inner cavities of the two drying cylinders through the two communicating holes correspondingly. The two air inlet assemblies are arranged separately, so that an air inlet flow channel is simplified; a collecting cavity of the air outlet assembly communicates with inner cavities of the two drying cylinders through two communicating holes, and air is discharged through an air channel of the connecting piece after confluence. Therefore, a complex airflow channel is prevented from being formed in the drying cylinder, the problem that the drying cylinder needs to adopt a special welding mode is solved, and the process difficulty is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle chassis technology, and in particular to a dryer and air supply unit. Background Technology

[0002] In integrated air suspension systems, to obtain dry, high-pressure gas, the high-temperature, high-pressure gas output from the compressor typically needs to pass through a dryer to remove moisture. Please refer to [reference needed]. Figure 1 Some dryers adopt a dual-cylinder parallel layout, which can make the overall structure more compact.

[0003] However, the airflow channel 02 of the dryer 01 with its dual-cylinder parallel layout needs to be divided into two and then combined again, resulting in a complex structure. Furthermore, the high strength and sealing requirements necessitate special welding methods for the outer shell 03 and end cap 04 of the dryer 01, making the manufacturing process difficult and complex. Utility Model Content

[0004] The purpose of this invention is to provide a dryer and an air supply unit to solve the problems of complex structure and difficult manufacturing process of existing dryers.

[0005] To solve the above-mentioned technical problems, this utility model provides a dryer for use in an air supply unit. The dryer includes: two drying cylinders arranged in parallel, two air inlet assemblies and one air outlet assembly.

[0006] The drying cylinder has an inner cavity; the two air inlet assemblies are respectively disposed on the two drying cylinders and communicate with the inner cavities of the two drying cylinders respectively;

[0007] The gas outlet assembly includes a collector and a connector with a gas passage. The collector is connected to the two drying cylinders respectively. The collector has a collection cavity with one end open. At least a portion of the connector is inserted into the collection cavity. The collection cavity is connected to the inner cavity of the two drying cylinders through two connecting holes respectively.

[0008] Optionally, the connector has a one-way valve disposed in the gas passage.

[0009] Optionally, the air outlet assembly includes a first sealing ring and a second sealing ring; the first sealing ring and the second sealing ring are respectively arranged along the circumference of the connector; the connector is sealed to the cavity wall of the collecting cavity through the first sealing ring; the connector is used to seal to the valve body of the air supply unit through the second sealing ring.

[0010] Optionally, the drying cylinder includes a cylinder body and an end cap. The cylinder body has an opening at one end along its own axial direction, and the end cap is welded to the opening along the axis of the cylinder body to close the opening and form the inner cavity.

[0011] Optionally, the connecting hole and the end cap are arranged axially spaced apart along the cylinder, and the collecting cavity and the end cap are arranged axially spaced apart along the cylinder.

[0012] Optionally, both the opening and the end cap are circular.

[0013] Optionally, the air inlet assembly includes an air inlet column connected to the drying cylinder; the air inlet column has a through hole opened along its own axial direction, and the through hole communicates with the inner cavity of the drying cylinder.

[0014] Optionally, the air inlet assembly includes a third sealing ring disposed on the axial end face of the air inlet column; the air inlet column is used to seal and connect with the valve body of the air supply unit through the third sealing ring.

[0015] Optionally, the axes of the two drying cylinders are parallel to each other; the axis of the air inlet assembly is perpendicular to the axis of the drying cylinder; and the axis of the air outlet assembly is parallel to the axis of the air inlet assembly.

[0016] To solve the above-mentioned technical problems, this utility model also provides an air supply unit, which includes the dryer as described above, and also includes a valve body; the dryer is connected to the valve body through the air inlet assembly and the air outlet assembly.

[0017] In summary, in the dryer and air supply unit provided by this utility model, the dryer includes two drying cylinders arranged side by side, two air inlet assemblies, and one air outlet assembly; the drying cylinder has an inner cavity; the two air inlet assemblies are respectively disposed on the two drying cylinders and communicate with the inner cavities of the two drying cylinders respectively; the air outlet assembly includes a collector and a connector with a gas passage, the collector is respectively connected to the two drying cylinders; the collector has a collecting cavity with one end open, at least a portion of the connector is filled into the collecting cavity, and the collecting cavity communicates with the inner cavities of the two drying cylinders respectively through two connecting holes.

[0018] This configuration simplifies the airflow path by using two separate air inlet assemblies. Furthermore, the outlet assembly's collecting chamber connects to the inner cavities of the two drying cylinders via two connecting holes, allowing the air to flow out through the gas channel of the connector after merging. This avoids the need for complex airflow channels on the drying cylinders and the requirement for special welding methods, thus reducing the complexity of the manufacturing process. Attached Figure Description

[0019] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0020] Figure 1 A schematic diagram of a dryer;

[0021] Figure 2 This is a schematic diagram of the air supply unit according to an embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the dryer according to an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the dryer according to an embodiment of the present invention;

[0024] Figure 5 This is an axial cross-sectional schematic diagram of the dryer according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram showing the connection between the dryer and the valve body in an embodiment of this utility model.

[0026] In the attached image:

[0027] 01-Dryer; 02-Airflow channel; 03-Outer shell; 04-End cap;

[0028] 10-Valve body; 11-Compressor; 12-Air passage; 121-Branch air passage; 20-Dryer; 21-Inlet assembly; 210-Through hole; 211-Inlet column; 212-Third sealing ring; 22-Outlet assembly; 220-Collection chamber; 221-Collection piece; 222-Connector; 223-One-way valve; 224-First sealing ring; 225-Second sealing ring; 23-Drying cylinder; 230-Inner... Cavity; 2301-First zone; 2302-Second zone; 2303-Third zone; 231-Cylinder; 232-First perforated plate; 233-First filter; 234-Desiccant; 235-Second filter; 236-Second perforated plate; 237-Spring; 238-End cap; 239-Opening; 24-Reinforcing rib; 25-Support platform; 26-Connecting hole; 27-Bolt hole; 30-Actuator; 40-Controller. Detailed Implementation

[0029] To make the objectives, advantages, and features of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to facilitate and clarify the explanation of the objectives of the embodiments of this utility model. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different drawings may emphasize different aspects and sometimes use different scales.

[0030] As used in this invention, the singular forms “a,” “an,” “one,” and “the” include plural objects; the term “or” is generally used to mean “and / or”; the term “a number” is generally used to mean “at least one”; and the term “at least two” is generally used to mean “two or more”. Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as “first,” “second,” or “third” may explicitly or implicitly include one or at least two of that feature; “one end” and “the other end,” and “proximal end” and “distal end” generally refer to two corresponding parts, which include not only endpoints. Furthermore, the terms "installed," "connected," and "attached," as used in this utility model, and the term "set" on one element from another, should be interpreted broadly. They generally only indicate a connection, coupling, cooperation, or transmission relationship between the two elements, which can be direct or indirect through an intermediate element. They should not be construed as indicating or implying a spatial positional relationship between the two elements, meaning one element can be located inside, outside, above, below, or to one side of the other element, unless otherwise explicitly stated. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances. Additionally, directional terms such as above, below, up, down, upward, downward, left, and right are used relative to exemplary embodiments as shown in the figures, with upward or up direction pointing towards the top of the corresponding figure, and downward or down direction pointing towards the bottom of the corresponding figure.

[0031] The purpose of this invention is to provide a dryer and an air supply unit to solve the problems of complex structure and difficult manufacturing process of existing dryers. The following description refers to the accompanying drawings.

[0032] Please refer to Figure 2This utility model provides an air supply unit, comprising: a valve body 10, a dryer 20, an actuator 30, and a controller 40, wherein the dryer 20, actuator 30, and controller 40 are respectively connected to the valve body 10. The valve body 10 contains a compressor 11, which drives the compressor 11 to output compressed gas. Optionally, the dryer 20 has bolt holes 27, allowing it to be connected to the valve body 10 via bolts passing through the bolt holes 27. The specific structure and principle of the valve body 10, actuator 30, and controller 40 can be found in existing technology and will not be elaborated upon here.

[0033] For further details, please refer to the following references. Figure 2 and Figure 3 The dryer 20 has an inlet assembly 21 and an outlet assembly 22, and is connected to the valve body 10 through the inlet assembly 21 and the outlet assembly 22. After the dryer 20 is assembled and connected to the valve body 10, the compressed gas output by the compressor 11 flows into the dryer 20 through the inlet assembly 21, is dried by the dryer 20, and then flows out through the outlet assembly 22 to the valve body 10, and is then delivered to the air tank or air spring through the connection port on the valve body 10.

[0034] Please refer to Figures 2 to 5 To address the issues of complex structure and difficult manufacturing process of the dryer 20, the dryer 20 provided by this utility model includes two parallelly arranged drying cylinders 23, two air inlet assemblies 21, and one air outlet assembly 22. Each drying cylinder 23 has an inner cavity 230. The two air inlet assemblies 21 are respectively disposed on the two drying cylinders 23 and communicate with the inner cavities 230 of the two drying cylinders 23. The air outlet assembly 22 includes a collector 221 and a connector 222 with a gas passage. The collector 221 is connected to the two drying cylinders 23. The collector 221 has a collection cavity 220 open at one end, and at least a portion of the connector 222 is inserted into the collection cavity 220. The collection cavity 220 communicates with the inner cavities 230 of the two drying cylinders 23 through two connecting holes 26.

[0035] Please refer to Figure 4 and Figure 5In an alternative example, each drying cylinder 23 includes a first perforated plate 232, a first filter 233, a desiccant 234, a second filter 235, a second perforated plate 236, and a spring 237. The first perforated plate 232, the first filter 233, the desiccant 234, the second filter 235, the second perforated plate 236, and the spring 237 are arranged sequentially along the axial direction of the drying cylinder 23 in the inner cavity 230. The first perforated plate 232 and the second perforated plate 236 preferably have a plurality of uniformly distributed vent holes to allow for uniform airflow. The first filter 233 and the second filter 235 filter the flowing gas, preventing dust from the desiccant 234 from leaking out and external particles from entering. The spring 237 provides a preload (e.g., pressure) to the second perforated plate 236 to compact the desiccant 234 contained between the first perforated plate 232 and the second perforated plate 236, reducing wear on the desiccant 234.

[0036] Optionally, the drying cylinder 23 includes a cylinder body 231 and an end cap 238. The cylinder body 231 has an opening 239 at one end along its own axial direction. The end cap 238 is welded to the opening 239 along the axis of the cylinder body 231 (the axis of the cylinder body 231 is also the axis of the entire drying cylinder 23) to close the opening 239 and form the inner cavity 230.

[0037] In one embodiment, only one end of the cylinder 231 in the axial direction ( Figure 5 The middle (right end) has an opening 239, and the other end ( Figure 5 (The middle part is the left end) closed. Therefore, during installation, the first perforated plate 232, the first filter 233, the desiccant 234, the second filter 235, the second perforated plate 236, and the spring 237 are sequentially inserted from the opening 239 side of the cylinder 231, and finally the end cap 238 is welded to close the opening 239. Of course, in some other embodiments, the cylinder 231 may also have openings 239 at both ends in the axial direction, and the openings 239 are subsequently closed by welding the bottom cover and the end cap 238.

[0038] Furthermore, the inner cavity 230 is axially divided into a first region 2301, a second region 2302, and a third region 2303; wherein the space occupied by the first perforated plate 232, the first filter 233, the desiccant 234, the second filter 235, and the second perforated plate 236 is the second region 2302, the space defined from the closed end of the cylinder 231 to the first perforated plate 232 is the first region 2301, and the space defined from the second perforated plate 236 to the end cap 238 is the third region 2303. In one embodiment, the gas flow direction ( Figure 4 and Figure 5 (Indicated by arrows) This means the airflow flows from the first zone 2301 through the second zone 2302 towards the third zone 2303. Understandably, at this time, the air inlet assembly 21 is connected to the first zone 2301, and the air outlet assembly 22 is connected to the third zone 2303.

[0039] Please refer to Figure 4 and Figure 5 In one embodiment, the axes of the two drying cylinders 23 are parallel to each other; the axis of the air inlet assembly 21 is perpendicular to the axis of the drying cylinders 23; and the axis of the air outlet assembly 22 is parallel to the axis of the air inlet assembly 21. Of course, in other embodiments, the axes of the two drying cylinders 23 do not necessarily have to be parallel; they can also form an angle, preferably not greater than 30°.

[0040] At the outlet end of the dryer 20, by configuring the collecting cavity 220 of the outlet assembly 22 to communicate with the inner cavity 230 through the connecting hole 26, the complex flow channel configuration at the outlet end can be simplified. Preferably, the connecting hole 26 and the end cap 238 are arranged axially spaced along the cylindrical body 231, and the collecting cavity 220 and the end cap 238 are arranged axially spaced along the cylindrical body 231, thereby separating the outlet assembly 22 from the end cap 238, resulting in a more regular weld seam on the end cap 238 and reducing the difficulty of the process.

[0041] The assembly 221 can be integrally formed with the cylinder 231, or it can be formed independently and then connected to the cylinder 231; this embodiment is not limited to either. The axis of the collecting cavity 220 is preferably perpendicular to the axis of the cylinder 231. The collecting cavity 220 is preferably cylindrical, and its inner diameter can be set relatively large. The connecting hole 26 can be, for example, an oblique hole, meaning that the axis of the connecting hole 26 is arranged at an angle to the axis of the collecting cavity 220. In one example, the connecting hole 26 can be formed from the opening of the collecting cavity 220 by machining an oblique drill. In other embodiments, the connecting hole 26 can also be formed by injection molding.

[0042] In a preferred embodiment, both the opening 239 and the end cap 238 are circular, and the cross-section of the inner cavity 230 is also circular. Since the air outlet assembly 22 is axially separated from the end cap 238, the arrangement of the connecting hole 26 does not affect the arrangement of the end cap 238 and its connection with the opening 239. This configuration allows for the sequential insertion of the first perforated plate 232, the first filter 233, the desiccant 234, the second filter 235, the second perforated plate 236, and the spring 237 through the opening 239. Furthermore, the circular end cap 238 and the opening 239 can be achieved using relatively convenient processes such as laser welding, and the regular shape helps ensure the strength of the weld.

[0043] Preferably, the connector 222 has a one-way valve 223, which is disposed in the gas passage to control the flow direction of the gas. Specifically, the one-way valve 223 only allows gas to flow from the collecting chamber 220 to the outside of the connector 222, while restricting gas from flowing from the outside of the connector 222 to the collecting chamber 220.

[0044] Please continue to refer to this. Figure 3 and Figure 5 Optionally, the air inlet assembly 21 includes an air inlet column 211 connected to the drying cylinder 23. The air inlet column 211 has a through hole 210 opening along its own axial direction, and the through hole 210 communicates with the inner cavity 230 of the drying cylinder 23. By setting two independent air inlet assemblies 21 at the air inlet end of the dryer 20, the complex flow channel configuration at the inlet end can be eliminated; only two air inlet columns 211 with through holes 210 are needed. In practice, this can be achieved through machining or injection molding, eliminating the need for welding parts and welding processes caused by complex flow channels. The through hole 210 is aligned with the first region 2301 in the axial direction of the cylinder 231, so that the through hole 210 communicates with the first region 2301. Therefore, the air inlet column 211 should be close to the closed end of the cylinder 231.

[0045] Optionally, the dryer 20 includes a plurality of reinforcing ribs 24, which are spaced apart along the axial direction of the drying cylinder 23 between two drying cylinders 23 and connected to each of the two drying cylinders 23. The spaced arrangement of the plurality of reinforcing ribs 24 along the axial direction of the drying cylinder 23 effectively improves the mechanical strength of the dryer 20. Further, the reinforcing ribs 24 are preferably perpendicular to the axis of the drying cylinder 23.

[0046] In one embodiment, the air intake columns 211 of the two air intake assemblies 21 are respectively fixedly mounted on the two drying cylinders 23, and the two air intake columns 211 are parallel to each other. Preferably, the axis of the air intake assembly 21 (i.e., the axis of the air intake column 211) is perpendicular to the axis of the drying cylinder 23. In an alternative example, a first reinforcing rib 24 arranged along the axial direction of the drying cylinder 23 is located near the axial end of the drying cylinder 23, and the two air intake columns 211 are mounted on this reinforcing rib 24. Furthermore, the assembly 221 is also mounted on a reinforcing rib 24.

[0047] Optionally, the dryer 20 includes a plurality of support platforms 25, one end of which is connected to the drying cylinder 23, and the other end is used to abut against the valve body 10. The support platforms 25 are preferably arranged on both sides of the reinforcing ribs 24, and are used to fit against the sides of the valve body 10 to define the relative position of the dryer 20 and the valve body 10. Figure 3 In the illustrated example, there are four support platforms 25. It will be understood that in other embodiments, the number of support platforms 25 is not limited to four, and may be more or less. Furthermore, the intake column 211 preferably protrudes above the support platform 25, and correspondingly, the valve body 10 has a recessed connection port to accommodate the intake column 211.

[0048] Please refer to Figure 3 and Figure 4Optionally, the air outlet assembly 22 includes a first sealing ring 224 and a second sealing ring 225; the first sealing ring 224 and the second sealing ring 225 are respectively arranged circumferentially along the connector 222; the connector 222 is sealed to the cavity wall of the collecting chamber 220 through the first sealing ring 224; the connector 222 is used to seal to the valve body 10 of the air supply unit through the second sealing ring 225. In an alternative example, a portion of the connector 222 is inserted into the collecting chamber 220, and the two have matching concave and convex shapes. Further, the portion of the connector 222 inserted into the collecting chamber 220 has a circumferentially opened sealing ring receiving groove, in which the first sealing ring 224 is received. Thus, the connector 222 can achieve a sealed connection with the cavity wall of the collecting chamber 220 through the first sealing ring 224, thereby sealing the collecting chamber 220. The portion of the connector 222 extending out of the collecting cavity 220 has a circumferentially stepped groove, and the second sealing ring 225 can be fitted onto the stepped groove. Correspondingly, the valve body 10 has a recessed connection port, and the portion of the connector 222 extending out of the collecting cavity 220 can achieve a sealed connection with the valve body 10 through the connection port of the second sealing ring 225. Thus, after the gas flows out from the inner cavity 230 of the drying cylinder 23 through the connecting hole 26 to the collecting cavity 220, it can only flow into the valve body 10 through the gas passage of the connector 222 and the one-way valve 223, reducing or avoiding leakage.

[0049] The air inlet assembly 21 includes a third sealing ring 212, which is disposed on the axial end face of the air inlet column 211. The air inlet column 211 is used for a sealed connection with the valve body 10 of the air supply unit through the third sealing ring 212. Considering that there are two air inlet assemblies 21, the sealing connection between the air inlet assembly 21 and the valve body 10 is configured as an end face seal, which has relatively low requirements for the radial precision of the air inlet column 211 and allows for a certain degree of error. Combined with the circumferential sealing method of the air outlet assembly 22, the positioning requirements are relaxed, and the machining accuracy requirements and assembly accuracy requirements of the dryer 20 and the valve body 10 are reduced.

[0050] like Figure 6 As shown, for a dryer 20 with two air inlet assemblies 21, the air passage 12 inside the valve body 10 provided by this invention can be adapted to have two branch air passages 121, which are respectively connected to the two air inlet assemblies 21. The air passages 12 and the branch air passages 121 can be formed by injection molding.

[0051] Based on the dryer 20 and air supply unit described above, this embodiment of the present invention also provides an air suspension system, which includes the air supply unit described above, and optionally further includes components such as air springs, shock absorbers, guide mechanisms, sensors, and air tanks. The structure and principle of these components can be found in the prior art, and will not be described in detail in this embodiment.

[0052] In summary, the dryer and air supply unit provided by this utility model include two parallel drying cylinders, two air inlet assemblies, and one air outlet assembly. Each drying cylinder has an inner cavity. The two air inlet assemblies are respectively disposed on the two drying cylinders and communicate with the inner cavities of the two drying cylinders. The air outlet assembly includes a collector and a connector with a gas passage. The collector is connected to the two drying cylinders respectively. The collector has a collecting cavity open at one end, and at least a portion of the connector is inserted into the collecting cavity. The collecting cavity communicates with the inner cavities of the two drying cylinders through two connecting holes. This configuration simplifies the airflow path by using two separate air inlet assemblies. Furthermore, the collecting cavity of the air outlet assembly communicates with the inner cavities of the two drying cylinders through two connecting holes, and the air flows out through the gas passage of the connector after merging. This avoids the need for complex airflow channels on the drying cylinders, avoids the requirement for special welding methods for the drying cylinders, and reduces the manufacturing difficulty.

[0053] It should be noted that the above embodiments can be combined with each other. The above description is only a description of preferred embodiments of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present utility model.

Claims

1. A dryer for an air supply unit, characterized in that: include: Two drying cylinders arranged in parallel, two air inlet assemblies and one air outlet assembly; The drying cylinder has an inner cavity; the two air inlet assemblies are respectively arranged on the two drying cylinders and are respectively connected to the inner cavities of the two drying cylinders; The air outlet assembly includes a collecting piece and a connecting piece with a gas channel, and the collecting piece is connected to the two drying cylinders respectively; the collecting piece has a collecting cavity with one end open, and at least part of the connecting piece is filled into the collecting cavity, and the collecting cavity is connected to the inner cavities of the two drying cylinders through two connecting holes.

2. The dryer according to claim 1, characterized in that The connecting piece has a one-way valve, and the one-way valve is arranged in the gas channel.

3. The dryer according to claim 1, characterized in that The air outlet assembly includes a first sealing ring and a second sealing ring; the first sealing ring and the second sealing ring are respectively arranged along the circumference of the connecting piece; the connecting piece is sealed connected to the cavity wall of the collecting cavity through the first sealing ring; the connecting piece is used to be sealed connected to the valve body of the air supply unit through the second sealing ring.

4. The dryer according to claim 1, characterized in that The drying cylinder comprises a cylinder body and an end cover. The cylinder body has an opening at one end along its axial direction. The end cover is welded to the opening along the axis of the cylinder body to close the opening and form the inner cavity.

5. The dryer according to claim 4, characterized in that The communicating hole and the end cover are arranged at intervals along the axial direction of the cylinder, and the collecting chamber and the end cover are arranged at intervals along the axial direction of the cylinder.

6. The dryer according to claim 4, characterized in that The opening and the end cover are both circular.

7. The dryer according to claim 1, characterized in that The air inlet assembly includes an air inlet column, which is connected to the drying cylinder; the air inlet column has a through hole opened along its own axial direction, and the through hole is connected to the inner cavity of the drying cylinder.

8. The dryer according to claim 7, characterized in that The air inlet assembly comprises a third sealing ring, and the third sealing ring is arranged on the axial end surface of the air inlet column; the air inlet column is used for sealing connection with the valve body of the air supply unit through the third sealing ring.

9. The dryer according to claim 1, characterized in that The axes of the two drying cylinders are parallel to each other; the axis of the air inlet assembly is perpendicular to the axis of the drying cylinder; and the axis of the air outlet assembly is parallel to the axis of the air inlet assembly.

10. An air supply unit, characterized in that: The invention comprises the dryer according to any one of claims 1 to 9, and further comprises a valve body; the dryer is connected to the valve body through the air inlet assembly and the air outlet assembly.

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