A vehicle-mounted air supply unit heating dryer with a printed heating sleeve

Abstract

The utility model discloses a vehicle air supply unit heating dryer with printing heating sleeve belongs to vehicle air supply system technical field, aims at solving the problem of low regeneration efficiency, poor high pressure sealing reliability and insufficient vibration resistance of electrical connection of existing vehicle dryer. The dryer comprises annular welding sealing upper and lower pressure bearing cavities, coaxial built-in stainless steel heating sleeve, air passage compression assembly and elastic sheet connector; the sleeve outer wall printing film heating module is provided with a solder pad, the end is provided with an assembly guide fillet and a circumferential positioning notch, the inner wall of the cylinder is axially compressed and attached by the pre-tightening spring; the side-mounted elastic sheet connector is in elastic contact with the solder pad, and synchronous transmission heating power supply and temperature signal. The utility model can realize the full domain efficient regeneration of the drying agent, the overall pressure reaches 35bar, the sealing is reliable, the vibration resistance is strong, and is suitable for vehicle closed air supply unit.

Description

Technical Field

[0001] This utility model relates to the technical field of vehicle air supply systems, specifically a vehicle air supply unit heating dryer with a printed heating sleeve. Background Technology

[0002] Vehicle-mounted closed-loop air supply units rely on internal high-pressure gas circulation for operation, introducing outside air only during open-loop inflation. Moisture in the air can easily enter the air circuit system with the airflow. Due to vehicle lightweighting and installation size limitations, the amount of desiccant inside the dryer is limited, and it is prone to rapid saturation with water under high humidity conditions. Moisture will continuously corrode the metal parts inside the air circuit, causing pneumatic components to jam and fail, significantly shortening the overall service life of the system.

[0003] Currently, desiccant regeneration solutions for vehicle-mounted dryers mainly fall into two categories: The first is a passive heating regeneration solution, which relies on the waste heat generated by the pump and motor to heat and dehydrate the desiccant. This solution has a long heat transfer path, low and uneven heating temperature, poor desiccant regeneration efficiency, and incomplete dehydration. After long-term operation, the desiccant's adsorption capacity continuously decreases, failing to meet the long-term use requirements in high-humidity environments. The second category is an external independent heating component solution, which adds a heating device to the outside of the dryer and connects it to the drying chamber via pipelines. This solution has numerous pipeline joints and dense high-pressure sealing points, making it prone to air leakage and water seepage under long-term 35bar high-pressure conditions, resulting in insufficient reliability. Furthermore, its large overall size is inconvenient for vehicle space layout.

[0004] Existing solutions for built-in heating structures often employ an external wiring terminal combined with a threaded heating rod, which has three main drawbacks: First, the assembly process is cumbersome, requiring each heating rod to be screwed into the cavity individually, resulting in numerous sealing surfaces, high assembly precision requirements, and low mass production efficiency. Second, the sealing and isolation effect between the heating component and the internal air passage of the cavity is poor, allowing moisture to easily enter the heating circuit and cause short circuit damage, resulting in a short service life. Third, electrical connections often use traditional male-female plug-in connectors, which are prone to loosening under long-term vehicle vibration conditions, leading to interruptions in heating power supply and temperature signal transmission, heating failure, and severely affecting the operational stability of the air passage system.

[0005] In summary, existing technologies cannot simultaneously meet the requirements of reliable high-pressure sealing, excellent vibration resistance, high regeneration efficiency, and low assembly cost in vehicle-mounted applications, and have significant technical shortcomings. Utility Model Content

[0006] This invention provides a vehicle-mounted air supply unit heating dryer with a printed heating sleeve, which can solve the technical problem that the existing technology cannot simultaneously meet the requirements of vehicle-mounted working conditions such as high pressure sealing reliability, excellent vibration resistance, high regeneration efficiency, and low assembly cost.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a vehicle-mounted air supply unit heating dryer with a printed heating sleeve, comprising a pressure-bearing cavity assembly, a heating sleeve, a desiccant, a venting and pressing assembly, and an electrical connection assembly. The pressure-bearing cavity assembly forms a coaxial mounting cavity, and the heating sleeve is coaxially embedded within this cavity. The heating sleeve includes a sleeve base, the outer wall of which is printed with a thin-film heating module and has pads for conductivity and temperature acquisition. The desiccant fills the internal cavity of the heating sleeve and is axially pressed by the venting and pressing assembly, causing the desiccant to adhere to the inner wall of the heating sleeve for full-area heat exchange. The electrical connection assembly includes an electrical connector and a spring-loaded connector. The electrical connector is mounted on the side wall of the pressure-bearing cavity assembly, and the spring-loaded connector is disposed within the side wall of the pressure-bearing cavity assembly. The spring-loaded connector has several conductive springs arranged on it, one end of which elastically abuts against the pad, and the other end... The heating power supply and temperature signal are synchronously transmitted through the conductive pins in the electrical connector. The two ends of the pressure-bearing cavity assembly are respectively provided with air inlet and air outlet. The heating sleeve is coaxially embedded in the cavity. The coaxial cooperation between the two ensures the uniform circumferential position of the sleeve. At the same time, a stable installation gap is formed between the outer wall of the sleeve and the inner wall of the cavity, providing space for the electrical connection and sealing structure. The two work together to achieve overall high-pressure sealing and precise positioning of internal components. The conductive spring elastically abuts against the pad on the outer wall of the sleeve. On the one hand, the elastic pre-tightening force offsets the relative displacement caused by the vibration of the whole vehicle, avoiding connection loosening and power interruption. On the other hand, the pad is integrated with the heating module and temperature acquisition circuit on the outer wall of the sleeve, eliminating the need for additional wiring and welding, simplifying the internal assembly process. The electrical connector achieves standardized wire harness docking externally and stable conduction internally with the conductive spring. The external power supply and signal transmission path is introduced into the cavity from the side wall of the cavity, which not only ensures the cavity side sealing of the electrical connection, but also realizes the reliable transfer of internal and external circuits.

[0008] Preferably, the pressure-bearing cavity assembly includes a lower cavity and an upper cavity, which are welded and sealed together as an integral pressure-bearing structure through an annular welding surface. The integral structure of the upper and lower cavities, which are welded together in an annular shape, provides a high-precision coaxial mounting reference for the internal heating sleeve, ensuring the coaxiality of the sleeve and the cavity, and thus ensuring the alignment accuracy of the welding pad and the side conductive spring.

[0009] Preferably, both the upper and lower ends of the sleeve base are provided with assembly guide rounded corners, and the lower end face is provided with an end face positioning notch. The end face positioning notch is engaged with the positioning step inside the pressure-bearing cavity assembly to achieve circumferential anti-rotation positioning of the heating sleeve. Through circumferential anti-rotation positioning, it is ensured that the solder pads on the outer wall of the sleeve are always accurately aligned with the side conductive springs, avoiding solder pad displacement and spring contact failure caused by circumferential rotation of the sleeve. The guiding effect of the end rounded corners, combined with the compression sealing of the sealing ring, reduces the assembly difficulty and avoids damage to the sealing ring during the assembly process.

[0010] Preferably, sealing rings are provided between the upper and lower ends of the heating sleeve and the coaxial mounting cavity to isolate the air passages inside and outside the sleeve, thus avoiding drying failure caused by short circuits in the air passages.

[0011] Preferably, the spring-type connector has multiple slots arranged side by side, and the conductive spring is S-shaped and snaps into the corresponding slot. The S-shaped structure has good elastic deformation capability, which can provide stable radial elastic preload, while increasing the deformation stroke of the spring, which can absorb a larger amplitude of vibration displacement and has better vibration resistance than straight springs. On the one hand, the limiting function of the slot prevents the spring from shifting or falling off under vibration, ensuring the installation stability of the spring; on the other hand, the elastic deformation direction of the S-shaped structure is perpendicular to the surface of the pad, which can stably maintain the elastic abutment force on the pad, and maintain reliable electrical contact under the radial and axial vibration of the whole vehicle.

[0012] Preferably, the outer side of the pressure-bearing cavity assembly is integrally formed with a cavity support, and at least one shock-absorbing sleeve is fitted inside the mounting hole of the cavity support. The integrally formed cavity support and the shock-absorbing sleeve cooperate to realize the flexible installation of the dryer, which not only ensures the strength of the installation structure, but also attenuates the vibration generated by the vehicle's movement through the shock-absorbing sleeve, thereby reducing the vibration load on internal components such as heating sleeves, spring connectors, and desiccants.

[0013] Preferably, the sleeve substrate is made of stainless steel. The stainless steel substrate is well compatible with the printed thin film heating module. The thin film circuit can be directly printed on the stainless steel surface, with strong adhesion and uniform heat conduction.

[0014] Preferably, the thin-film heating module is a graphene thin-film resistor or a metal thin-film resistor, which is formed on the outer wall of the sleeve substrate by printing process. The graphene thin-film resistor or the metal thin-film resistor is printed on the surface of the stainless steel sleeve substrate and is tightly bonded to the substrate. It has low thermal resistance and high thermal conductivity, and the heat can be quickly transferred to the desiccant on the inner wall of the sleeve.

[0015] Preferably, the venting and pressing assembly includes a venting base, a venting pad, a filter cotton, and a pre-tightening spring arranged sequentially from bottom to top. The venting base is supported on the inner side of the bottom of the sleeve base and is used to evenly distribute the intake airflow. The upper end of the pre-tightening spring abuts against the top surface of the inner wall of the pressure-bearing cavity assembly, and the lower end axially presses the desiccant through the venting pad. The filter cotton is disposed on top of the desiccant and is used to intercept the desiccant powder.

[0016] Preferably, the bottom of the pressure-bearing cavity assembly is evenly provided with multiple reinforcing hollow grooves around the exhaust nozzle. The reinforcing hollow grooves are arranged in coordination with the bottom air intake structure to reduce weight while ensuring the structural strength of the air intake channel. Combined with the pressure-bearing structure of the integral welded cavity, a lightweight design is achieved while meeting the 35 bar high pressure requirement.

[0017] Compared with the prior art, the beneficial effects of this utility model are: The desiccant regeneration efficiency is significantly improved. The stainless steel sleeve with a heating module printed on the outer wall achieves uniform heating throughout the entire area, and the heat is directly transferred to the internal molecular sieve desiccant. Combined with the axial pre-tightening structure, the desiccant is tightly attached to the inner wall of the sleeve, resulting in a short heat exchange path, high heat utilization rate, more thorough dehydration and regeneration of the desiccant, and effectively extending the single adsorption cycle.

[0018] The electrical connection exhibits excellent vibration resistance. It adopts a spring-loaded elastic contact structure instead of traditional plug-in connectors, and with the positioning notch on the end face of the sleeve, it achieves precise circumferential anti-rotation alignment. Under long-term vibration conditions of the entire vehicle, it can stably transmit heating power supply and temperature signals, eliminating heating failure problems caused by loose connectors.

[0019] The upper and lower cavities are integrally formed by ring welding, which eliminates the risk of leakage at the joint surface of the separate parts from the structure. The heating sleeve end is equipped with a guide rounded corner to avoid scratching the sealing ring during assembly. Together with the sealing rings at both ends, the internal and external air paths of the sleeve are isolated. The whole can stably withstand a high pressure of 35 bar. With fewer sealing points, there is no risk of internal or external leakage during long-term operation.

[0020] Built-in NTC temperature monitoring enables over-temperature power limit protection, taking into account both component protection and energy consumption optimization. The one-piece molded shock-absorbing bracket can buffer driving vibrations and extend the service life of the whole machine. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front sectional view of the present invention; Figure 3 This is the main view of the present invention. Figure 4 for Figure 3 AA-direction sectional view of the structure; Figure 5This is a partial three-dimensional structural diagram of the present invention; Figure 6 This is a three-dimensional structural diagram of the heating sleeve of this utility model.

[0022] Figure label: 1. Heating sleeve; 3. Sealing ring; 4. Exhaust nozzle; 5. Lower cavity; 6. Upper cavity; 9. Air inlet; 10. Electrical connector; 101. Conductive pin; 102. Sealing gasket; 11. Sleeve base; 12. Thin-film heating module; 13. Solder pad; 14. End face positioning notch; 15. Desiccant; 16. Spring connector; 161. Conductive spring; 163. Slot; 17. Welding surface; 18. Ventilation base; 19. Assembly guide fillet; 20. Reinforced hollow groove; 21. Cavity support; 23. Shock-absorbing sleeve; 24. Ventilation pad; 25. Preload spring; 26. Filter cotton. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0024] like Figure 1-6As shown, this utility model addresses the technical problem that existing technologies cannot simultaneously meet the requirements of reliable high-pressure sealing, excellent vibration resistance, high regeneration efficiency, and low assembly cost in vehicle-mounted applications. The following technical solution is provided: A vehicle-mounted air supply unit heating dryer with a printed heating sleeve, comprising a pressure-bearing cavity assembly, a heating sleeve 1, a desiccant 15, a venting and pressing assembly, and an electrical connection assembly. The pressure-bearing cavity assembly forms a coaxial mounting cavity, and the heating sleeve 1 is coaxially embedded within this cavity. The heating sleeve 1 includes a sleeve base 11. The outer wall of the heating sleeve 11 is printed with a thin-film heating module 12 and is provided with pads 13 for conductivity and temperature acquisition. The desiccant 15 is filled in the internal cavity of the heating sleeve 1 and is axially pressed by the venting and pressing assembly, so that the desiccant 15 adheres to the inner wall of the heating sleeve 1 to achieve full-area heat exchange. The electrical connection assembly includes an electrical socket 10 and a spring-loaded connector 16. The electrical socket 10 is installed on the side wall of the pressure-bearing cavity assembly, and the spring-loaded connector 16 is disposed in the side wall of the pressure-bearing cavity assembly. Several spring-loaded connectors are arranged on the spring-loaded connector 16. A conductive spring 161 has one end elastically abutting against a solder pad 13, and the other end connected to a conductive pin 101 in an electrical connector 10 to synchronously transmit heating power and temperature signals. The pressure-bearing cavity assembly has an air inlet 9 and an exhaust outlet 4 at both ends. The heating sleeve 1 is coaxially embedded in the cavity, ensuring uniform circumferential positioning of the sleeve. Simultaneously, a stable installation gap is formed between the outer wall of the sleeve and the inner wall of the cavity, providing space for electrical connections and sealing structures. Together, they achieve overall high-pressure sealing and precise positioning of internal components. Positioning; the conductive spring 161 elastically abuts against the solder pad 13 on the outer wall of the sleeve. On the one hand, the elastic pre-tightening force counteracts the relative displacement caused by the vibration of the whole vehicle, avoiding loosening of the connection and power interruption. On the other hand, the solder pad 13 is integrated with the heating module and temperature acquisition circuit on the outer wall of the sleeve, eliminating the need for additional wiring and welding, thus simplifying the internal assembly process. The electrical connector achieves standardized wiring harness docking externally and stable conduction with the conductive spring internally, introducing the external power supply and signal transmission path from the cavity side wall into the interior. This ensures both the cavity side sealing of the electrical connection and the reliable transfer of internal and external circuits.

[0025] In this embodiment, the pressure-bearing cavity assembly includes a lower cavity 5 and an upper cavity 6, which are welded and sealed together as an integral pressure-bearing structure by an annular welding surface 17. The integral structure of the upper and lower cavities, which are welded together in an annular shape, provides a high-precision coaxial installation reference for the internal heating sleeve, ensuring the coaxiality of the sleeve and the cavity, and thus ensuring the alignment accuracy of the welding pad and the side conductive spring.

[0026] In this embodiment, both the upper and lower ends of the sleeve base 11 are provided with assembly guide rounded corners 19, and the lower end face is provided with an end face positioning notch 14. The end face positioning notch 14 is fitted and cooperated with the positioning step inside the pressure-bearing cavity assembly to realize the circumferential anti-rotation positioning of the heating sleeve 1. Through circumferential anti-rotation positioning, it is ensured that the solder pads on the outer wall of the sleeve are always accurately aligned with the side conductive springs, avoiding the solder pads from shifting and the springs from failing to contact due to circumferential rotation of the sleeve. The guiding effect of the end rounded corners, combined with the compression sealing of the sealing ring, reduces the assembly difficulty and avoids damage to the sealing ring during the assembly process.

[0027] In this embodiment, sealing rings 3 are provided between the upper and lower ends of the heating sleeve 1 and the coaxial mounting cavity to isolate the air passages inside and outside the sleeve, thus avoiding drying failure caused by short circuits in the air passages.

[0028] In this embodiment, the spring-type connector 16 has multiple slots 163 arranged side by side. The conductive spring 161 is S-shaped and is snapped into the corresponding slot 163. The S-shaped structure has good elastic deformation capability, which can provide stable radial elastic preload and increase the deformation stroke of the spring, which can absorb a larger amplitude of vibration displacement and has better vibration resistance than straight spring. On the one hand, the limiting function of the slot prevents the spring from shifting or falling off under vibration, ensuring the installation stability of the spring. On the other hand, the elastic deformation direction of the S-shaped structure is perpendicular to the surface of the pad, which can stably maintain the elastic abutment force on the pad, and maintain reliable electrical contact under the radial and axial vibration of the whole vehicle.

[0029] In this embodiment, a cavity support 21 is integrally formed on the outer side of the pressure-bearing cavity assembly. At least one shock-absorbing sleeve 23 is fitted inside the mounting hole of the cavity support 21. The integrally formed cavity support and the shock-absorbing sleeve cooperate to realize the flexible installation of the dryer, which not only ensures the strength of the installation structure, but also attenuates the vibration generated by the vehicle's movement through the shock-absorbing sleeve, thereby reducing the vibration load on internal components such as heating sleeves, spring connectors, and desiccants.

[0030] In this embodiment, the sleeve substrate 11 is made of stainless steel. The stainless steel substrate is well compatible with the printed thin film heating module. The thin film circuit can be directly printed on the stainless steel surface, with strong adhesion and uniform heat conduction.

[0031] In this embodiment, the thin-film heating module 12 is a graphene thin-film resistor or a metal thin-film resistor, which is formed on the outer wall of the sleeve substrate 11 by printing process. The graphene thin-film resistor or the metal thin-film resistor is printed on the surface of the stainless steel sleeve substrate and is tightly bonded to the substrate. It has low thermal resistance and high thermal conductivity, and the heat can be quickly transferred to the desiccant on the inner wall of the sleeve.

[0032] In this embodiment, the venting and pressing assembly includes a venting base 18, a venting pad 24, a filter cotton 26, and a pre-tensioning spring 25 arranged sequentially from bottom to top. The venting base 18 is supported on the inner side of the bottom of the sleeve base 11 and is used to evenly distribute the intake airflow. The upper end of the pre-tensioning spring 25 abuts against the top surface of the inner wall of the pressure-bearing cavity assembly, and the lower end axially presses the desiccant 15 through the venting pad 24. The filter cotton 26 is disposed on the top of the desiccant 15 and is used to intercept the desiccant powder.

[0033] In this embodiment, as Figure 5 As shown, the bottom of the pressure-bearing cavity assembly is evenly provided with multiple reinforcing hollow grooves 20 around the exhaust nozzle 4. The reinforcing hollow grooves are arranged in coordination with the bottom air intake structure to ensure the structural strength of the air intake channel while reducing weight. Combined with the pressure-bearing structure of the overall welded cavity, a lightweight design is achieved while meeting the 35 bar high pressure requirement.

[0034] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment discloses a vehicle-mounted air supply unit heater-dryer with a printed heating sleeve, integrated into a vehicle-mounted closed air supply unit. It is used to dry and filter high-pressure compressed air and to achieve the recycling of the desiccant through heating and regeneration. The entire unit can withstand a maximum working pressure of 35 bar, making it suitable for the strong vibration and wide temperature range working environment of the vehicle.

[0035] This heating dryer mainly consists of a pressure-bearing cavity assembly, a heating sleeve 1, a desiccant 15, a venting and pressing assembly, an electrical connection assembly, an air passage interface assembly, and a vibration-damping mounting structure. The pressure-bearing cavity assembly is a hollow, rotating structure with a coaxial mounting cavity inside. The heating sleeve 1 is coaxially embedded in this coaxial mounting cavity and filled with a molecular sieve desiccant 15. The venting and pressing assembly is arranged axially inside the heating sleeve 1, pressing the desiccant 15 tightly against the inner wall of the heating sleeve 1. The electrical connection assembly is installed on the side wall of the pressure-bearing cavity assembly and elastically contacts the conductive contacts on the outer wall of the heating sleeve 1 to realize heating power supply and temperature signal transmission. The air passage interface assembly connects the internal air passage of the cavity to the external air pump and pneumatic system. The vibration-damping mounting structure is integrally formed on the outside of the cavity, realizing flexible installation of the dryer on the vehicle.

[0036] The pressure-bearing cavity assembly includes a lower cavity 5 and an upper cavity 6, both of which are made of aluminum alloy or cold-rolled steel sheet through stamping and machining. The lower cavity 5 and the upper cavity 6 are butt-welded together by an annular welding surface 17 to form an integral sealed pressure-bearing structure, which can withstand a working pressure of 35 bar as a whole, without the risk of leakage at the sealing joint surface of separate parts.

[0037] The lower cavity 5 has an annular positioning step inside to support the lower end face of the heating sleeve 1. A radial positioning protrusion on the positioning step engages with the end face positioning notch 14 on the lower end face of the heating sleeve 1, restricting the circumferential rotation of the heating sleeve 1. An axial air intake channel is located at the bottom of the lower cavity 5, communicating with the air inlet 9 on the side wall. Multiple reinforcing perforated grooves 20 are evenly arranged around the bottom outer wall of the lower cavity, achieving lightweighting while ensuring structural strength and optimizing the stress distribution at the bottom. The upper cavity 6 forms an upper cavity to accommodate the upper structure of the ventilation and pressing assembly. An exhaust nozzle 4 is located on the side wall of the lower cavity 5, communicating with the internal air passage of the cavity. A cavity support 21 is integrally formed on the outer side of the cavity. The cavity support 21 has mounting holes, and a shock-absorbing sleeve 23 is fitted inside the mounting holes. The shock-absorbing sleeve 23 is made of EPDM rubber-like flexible material. The dryer is installed on the vehicle frame via bolts passing through the shock-absorbing sleeve 23, buffering driving vibrations and achieving flexible installation.

[0038] The heating sleeve 1 is a thin-walled rotary structure made of stainless steel, including a sleeve base 11. The sleeve base 11 is made of 304 stainless steel by stamping, combining structural load-bearing capacity, thermal conductivity, and corrosion resistance. A thin-film heating module 12 is printed on the outer wall of the sleeve base 11. The thin-film heating module 12 is a graphene thin-film resistor or a metal thin-film resistor, which is uniformly covered in the main area of ​​the outer wall of the sleeve through a printing process. After being energized, it can generate uniform heat throughout the circumference and axial direction of the sleeve. The outer wall of the sleeve base 11 is also provided with pads 13, including positive and negative power supply pads and temperature signal pads, which are electrically connected to the thin-film heating module 12 and the built-in NTC temperature monitoring circuit, respectively. Both the upper and lower ends of the sleeve base 11 are provided with assembly guide fillets 19, which are rounded transition structures that serve as guides and centers during assembly, preventing sharp edges from scratching the sealing ring. The lower end face of the sleeve base 11 has an end face positioning notch 14, which engages with the positioning protrusion of the positioning step inside the lower cavity 5 to achieve circumferential anti-rotation positioning and ensure precise alignment between the outer wall welding pad 13 and the side electrical connection components. Sealing rings 3 are provided between the upper and lower ends of the heating sleeve 1 and the positioning step inside the cavity. The sealing rings 3 are made of EPDM rubber and achieve radial sealing under pressure, isolating the internal and external air passages of the sleeve, preventing short circuits of high-pressure gas and water vapor intrusion into the heating circuit, and meeting the 35 bar high-pressure airtightness requirement.

[0039] The venting and pressing assembly includes, from bottom to top along the axial direction, a venting base 18, a venting pad 24, a desiccant 15, a filter cotton 26, and a pre-tensioning spring 25. The venting base 18 is a porous rigid structure, supported on the step on the inner side of the bottom of the sleeve base 11. Its bottom is opposite to the air inlet channel of the lower cavity 5, which evenly distributes the incoming high-pressure airflow to the entire sleeve cross-section, avoiding concentrated airflow scouring.

[0040] The ventilation pad 24 is made of a porous, flexible material and is laid on top of the ventilation base 18 to further homogenize the airflow and buffer the vibration and impact of the desiccant particles, reducing particle wear. The desiccant 15 is made of molecular sieve particles and is filled between the ventilation pad 24 and the filter cotton 26 inside the sleeve. It is used to adsorb moisture in the compressed air and is regenerated by desorption after heating.

[0041] Filter cotton 26, a porous filter material, is laid on top of desiccant 15 to intercept powder generated by desiccant wear and prevent impurities from entering the downstream gas path. Pre-tension spring 25 is a cylindrical helical compression spring. Its upper end abuts against the top surface of the inner wall of the upper cavity 6, and its lower end presses against the desiccant 15 through a venting pad structure, providing continuous axial pre-tension force to compensate for volume changes caused by desiccant vibration and wear, ensuring the desiccant always adheres tightly to the inner wall of the sleeve and guaranteeing heat exchange efficiency.

[0042] The electrical connection assembly includes an electrical socket 10 and a spring-loaded connector 16. The electrical socket 10 is sealed and mounted on a side wall mounting base of the pressure-bearing cavity assembly, with a sealing gasket 102 installed between them. It has a standard automotive wiring harness interface on the outside and conductive pins 101 inside for docking with the vehicle wiring harness plug to enable the access of external power and signals.

[0043] A spring-loaded connector 16 is disposed on the inner side wall of the pressure-bearing cavity assembly, including an insulated injection-molded connector base. A row of slots 163 are arranged side-by-side along the sleeve axial direction on the base, each slot 163 holding a conductive spring 161. The conductive spring 161 is S-shaped, formed by stamping elastic copper sheet, and possesses excellent elastic deformation capability. The inner end of the conductive spring 161 elastically abuts against the solder pad 13 on the outer wall of the heating sleeve 1 radially, while the outer end corresponds to and conducts with the conductive pin 101 in the electrical connector 10, thereby synchronously transmitting the heating power supply current and the NTC temperature acquisition signal. This elastic contact structure replaces the traditional plug-in connector, using the elastic deformation of the spring to offset the relative displacement caused by vehicle vibration, avoiding power and signal interruptions caused by connector loosening, and exhibiting excellent vibration resistance.

[0044] The specific working principle of this embodiment includes drying and regeneration conditions: Drying condition: High-pressure compressed air containing water enters the bottom air intake channel of the lower cavity 5 through the air inlet 9. After being evenly distributed by the ventilation base 18 and the ventilation pad 24, it passes through the desiccant bed 15 from bottom to top. The moisture in the air is adsorbed by the molecular sieve desiccant. The dried clean gas is filtered by the filter cotton 26 and then output from the exhaust port 4 to the downstream pneumatic system such as the air spring, thus realizing the drying and filtration of the air path.

[0045] Regeneration Operation: When the desiccant becomes saturated, the vehicle controller supplies power to the thin-film heating module 12 via the electrical connector 10 and conductive spring 161. The heating sleeve 1 heats up as a whole, and the heat is conducted to the desiccant 15 through the inner wall of the sleeve, causing the moisture adsorbed by the desiccant particles to desorb. At the same time, the backflushing airflow enters the cavity from the exhaust nozzle 4 in the opposite direction, carrying the desorbed hot and humid air out from the air inlet side, completing the regeneration of the desiccant. The NTC temperature monitoring circuit built into the heating sleeve 1 collects the cavity temperature in real time and uploads the temperature signal to the vehicle controller via the conductive spring and connector. When the temperature exceeds the set threshold, the controller automatically reduces the heating power to prevent the heating element from overheating and burning out, while also reducing system energy consumption.

[0046] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0047] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0049] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

Claims

1. A vehicle-mounted air supply unit heating dryer with a printed heating sleeve, comprising a pressure-bearing cavity assembly, a heating sleeve (1), a desiccant (15), a ventilation and pressing assembly, and an electrical connection assembly, characterized in that: The pressure-bearing cavity assembly forms a coaxial mounting cavity. The heating sleeve (1) is coaxially embedded in the coaxial mounting cavity. The heating sleeve (1) includes a sleeve base (11). The outer wall of the sleeve base (11) is printed with a thin-film heating module (12) and is provided with pads (13) for conductivity and temperature acquisition. The desiccant (15) is filled in the internal cavity of the heating sleeve (1) and is axially pressed by the venting and pressing assembly, so that the desiccant (15) adheres to the inner wall of the heating sleeve (1) to achieve full-area heat exchange. The electrical connection assembly includes an electrical connector (1). 0) and spring-type connector (16), the electrical socket (10) is installed on the side wall of the pressure chamber assembly, the spring-type connector (16) is set inside the side wall of the pressure chamber assembly, the spring-type connector (16) is arranged with a number of conductive springs (161), one end of the conductive spring (161) is elastically abutted against the solder pad (13), and the other end is connected to the conductive PIN pin (101) in the electrical socket (10) to synchronously transmit heating power supply and temperature signal, and the two ends of the pressure chamber assembly are respectively provided with air inlet (9) and air outlet (4).

2. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The pressure-bearing cavity assembly includes a lower cavity (5) and an upper cavity (6), which are welded and sealed together as a single pressure-bearing structure through an annular welding surface (17).

3. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The upper and lower ends of the sleeve base (11) are provided with assembly guide fillets (19), and the lower end face is provided with an end face positioning notch (14). The end face positioning notch (14) is fitted and cooperated with the positioning step inside the pressure-bearing cavity assembly to realize the circumferential anti-rotation positioning of the heating sleeve (1).

4. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The heating sleeve (1) is provided with sealing rings (3) at both the upper and lower ends and the coaxial mounting cavity to isolate the air passages inside and outside the sleeve.

5. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The spring-type connector (16) has multiple slots (163) arranged side by side, and the conductive spring (161) is S-shaped and is snapped into the corresponding slot (163).

6. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The outer side of the pressure-bearing cavity assembly is integrally formed with a cavity support (21), and at least one shock-absorbing sleeve (23) is fitted inside the mounting hole of the cavity support (21).

7. The vehicle-mounted air supply unit heating dryer with printed heating sleeve according to claim 1, characterized in that: The sleeve base (11) is made of stainless steel.

8. The vehicle-mounted air supply unit heating dryer with a printed heating sleeve according to claim 7, characterized in that: The thin-film heating module (12) is a graphene thin-film resistor or a metal thin-film resistor, which is formed on the outer wall of the sleeve substrate (11) by printing process.

9. The vehicle-mounted air supply unit heating dryer with a printed heating sleeve according to claim 1, characterized in that: The ventilation and pressing assembly includes a ventilation base (18), a ventilation pad (24), a filter cotton (26), and a pre-tension spring (25) arranged sequentially from bottom to top. The ventilation base (18) is supported on the inner side of the bottom of the sleeve base (11) and is used to evenly distribute the intake airflow. The upper end of the pre-tension spring (25) abuts against the top surface of the inner wall of the pressure chamber assembly, and the lower end axially presses the desiccant (15) through the ventilation pad (24). The filter cotton (26) is set on the top of the desiccant (15) and is used to intercept the desiccant powder.

10. The vehicle-mounted air supply unit heating dryer with a printed heating sleeve according to claim 1, characterized in that: The bottom of the pressure-bearing cavity assembly is evenly provided with multiple reinforcing hollow grooves (20) around the exhaust port (4).

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