A micro-adsorption dryer

Abstract

The application provides a micro adsorption dryer, and belongs to the technical field of air drying equipment. The micro adsorption dryer comprises a shell, the inside of the shell is provided with a bottom plate, two tower bodies are symmetrically arranged below the bottom plate, a pressure gauge and a control module are assembled on the shell, air inlet holes and air outlet holes are arranged on the two sides of the shell, a silencer is arranged at the bottom of one side of the shell, a valve body is arranged in the shell, a first switching valve and a second switching valve are arranged on the bottom plate, a connecting pipe is arranged in the tower body, mesh plates are arranged at the top and the bottom of the connecting pipe, adsorbents are filled between the two mesh plates, an extension pipe is coaxially connected to the bottom end of the connecting pipe, and a second shunt plate is arranged at the top of the extension pipe. The multi-stage shunt structure realizes uniform airflow distribution, increases the contact area between the gas and the adsorbent, ensures sufficient contact between the gas and the adsorbent, guarantees the adsorption drying effect, and improves the utilization rate of the adsorbent.

Description

Technical Field

[0001] This application relates to the field of air drying equipment technology, specifically to a miniature adsorption dryer. Background Technology

[0002] Adsorption dryers utilize the porous structure of adsorbents (such as activated alumina and molecular sieves) to deeply remove water vapor from compressed air through physical adsorption. Their core workflow involves two alternating adsorption towers: when humid compressed air enters one tower, a large amount of moisture is trapped by the adsorbent, resulting in dry air with a dew point as low as -40°C or even lower; simultaneously, the other tower regenerates the saturated adsorbent through methods such as pressure reduction and heating, thus achieving continuous cycle operation. This periodic switching design ensures that the equipment can continuously provide stable, low-dew-point dry air.

[0003] The regeneration method of this equipment can be flexibly selected according to operating conditions, including heatless purging, micro-heating, forced-air heat recovery, and compression heat utilization, respectively adapting to different energy consumption requirements and dew point standards. It can stably output air with extremely low dew points from -40℃ to -70℃. Its core advantages lie in high drying accuracy, stable and reliable operation, and convenient maintenance. Moreover, energy-saving products can significantly reduce air and energy consumption. It is commonly used in industries with stringent requirements for air source cleanliness, such as electronics and semiconductors, pharmaceuticals and food, lithium battery manufacturing, and precision machinery, effectively avoiding equipment failures and product defects caused by moisture.

[0004] Referring to Chinese patent document CN211837141U, entitled "A Miniature Adsorption Dryer," the device includes a double-tower system, an upper pipeline, and a lower pipeline. The double-tower system comprises a first tower and a second tower, connected at their upper parts by a regeneration pipeline. Silencers are installed at the connections between the first and second towers and the lower pipeline. An electromagnetic exhaust valve is installed at the connection between the double-tower system and the upper pipeline, and an electromagnetic intake valve is installed at the connection between the double-tower system and the lower pipeline. The upper pipeline includes an exhaust chamber and an exhaust pipe, and the lower pipeline includes an intake chamber and an intake pipe. This document solves the problems of complex pipeline connections and high failure rates of multi-channel valves in existing technologies.

[0005] To address the aforementioned technical solution, components such as pipes and valves are integrated into the housing, effectively reducing the overall volume and facilitating wall-mounted installation while saving space. However, this compact design also presents two challenges: First, if the pre-filter fails to adequately remove oil mist and particulate impurities from the compressed air, contaminants can easily enter the adsorption tower and come into contact with the adsorbent, leading to an oil film covering the adsorbent surface and clogging of micropores. This not only reduces the adsorption capacity but also causes the adsorbent to pulverize, shortening its lifespan. Second, the gas flow path and distribution within the tower are often not fully optimized, and short-circuiting or channeling phenomena can easily occur, resulting in a large amount of adsorbent failing to effectively contact the humid air. This leads to low adsorbent utilization and a dynamic adsorption capacity far below the theoretical value, thus affecting the overall drying system's processing efficiency and dew point stability. Summary of the Invention

[0006] In view of this, this application provides a miniature adsorption dryer, which is mainly used to solve the problems of the adsorbent being easily contaminated by particulate impurities such as oil mist and uneven airflow distribution, resulting in a shortened adsorbent life and low utilization rate.

[0007] To address the aforementioned technical problems, this application provides a miniature adsorption dryer, comprising a shell, an internal base plate, two symmetrically arranged towers below the base plate, a pressure gauge and a control module mounted on the shell, an air inlet and an air outlet on both sides of the shell, and a silencer at the bottom of one side; a valve body is located inside the shell, and a first switching valve and a second switching valve are located on the base plate; a connecting pipe is located inside the towers, with mesh plates at both the top and bottom of the connecting pipe, and adsorbent filled between the two mesh plates; an extension pipe is coaxially connected to the bottom end of the connecting pipe, with a second flow divider plate at the top and a first flow divider plate at the bottom, the first flow divider plate having fewer mesh openings than the second flow divider plate, and the mesh size of the first flow divider plate being larger than that of the second flow divider plate; multiple through holes are evenly distributed circumferentially at the bottom end of the extension pipe, and a filter element is arranged between the first and second flow divider plates; an end cap is located at the bottom end of the towers.

[0008] By adopting the above technical solution, during the gas drying process, the compressed air to be dried is introduced into the extension pipe through the connecting pipe, and then enters the bottom of the tower body through the uniformly distributed circumferential holes at its bottom. First, pre-dispersion is achieved through the holes. Then, the dispersed gas flows upward and passes through the first distribution plate for secondary dispersion. The gas, after secondary dispersion, continues to rise and passes through the filter element, which efficiently traps oil mist and particulate impurities in the gas. This improves gas cleanliness while significantly reducing the risk of impurity contamination of the adsorbent, thereby extending the service life of the adsorbent. The filtered gas continues to rise and passes through the second distribution plate, where it undergoes further uniform distribution. Finally, the gas, after multiple dispersion optimizations, rises axially along the tower body, fully contacting the adsorbent filled inside the tower. Deep drying is achieved through adsorption, bringing the gas to the preset usage standards.

[0009] Optionally, the bottom outer side of the connecting pipe has an opening communicating with the inner cavity of the tower body, and a cover plate is movably connected above the second diverter plate. When the cover plate moves along the axial direction of the tower body to fit with the second diverter plate, it can seal the mesh of the second diverter plate. A displacement component is provided below the end cover. The displacement component is used to drive the extension pipe to move vertically up and down along the axial direction of the tower body. A sleeve block is fixedly provided on the upper surface of the end cover. The sleeve block is adapted to the through hole and is used to block the through hole.

[0010] By adopting the above technical solution, during the regeneration of the adsorbent inside the tower, the displacement component drives the extension pipe to move downwards along the tower axis, exposing the opening at the bottom of the connecting pipe. Simultaneously, the sleeve on the end cap forms a sealing fit with the through hole at the bottom of the extension pipe, effectively sealing the through hole. In this state, regeneration gas with a low initial moisture content enters the tower, passes through the adsorbent, and undergoes desorption, stripping away the adsorbed moisture and forming a gas rich in water vapor. This gas then directly enters the connecting pipe through the opening at the bottom and exits the tower along the connecting pipe channel, effectively preventing the water vapor-laden regeneration gas from flowing downwards and contacting other functional components at the bottom of the tower, thus reducing the adverse effects of water vapor on the normal operation of related components.

[0011] Optionally, the extension tube includes a first fitting and a second fitting, the top of the first fitting being threadedly connected to the bottom of the second fitting, and the second fitting being slidably sleeved on the outside of the bottom of the connecting tube.

[0012] By adopting the above technical solution, the filter element can be detachably assembled between the first and second diversion plates. When replacing it, only the first pipe needs to be rotated to separate the associated diversion plate from the other diversion plate, so that the filter element can be easily removed to complete the replacement. This operation process is simple and quick, effectively improving the convenience and efficiency of equipment maintenance.

[0013] Optionally, a collar is fitted on the inner side wall of the bottom of the tower body, and a one-way bearing is fixedly installed on the inner side of the collar. Multiple locking blocks are evenly arranged on the inner side wall of the one-way bearing along the circumference. A groove is opened on the outer side of the bottom of the filter element to fit the locking blocks one by one. A transmission connector is assembled between the collar and the tower body. The transmission connector is used to drive the collar to rotate around the axis of the tower body when the extension tube moves downward along the axial direction of the tower body, thereby driving the filter element linked with the collar to achieve periodic rotation.

[0014] By adopting the above technical solution, when the displacement component drives the extension tube to move downward along the tower axis, the transmission connector synchronously drives the filter element to rotate at a specific angle, realizing the periodic position switching of the filter element and ensuring that each filtration area of ​​the filter element can be fully utilized. This design can not only effectively extend the service life of the filter element, but also ensure the stability of the filtration performance during long-term operation of the equipment.

[0015] Optionally, the number of mesh holes and the hole size of the mesh plate are completely consistent with those of the second diverter plate; the end cap is provided with a connection hole that communicates with the inner cavity of the tower body, and a conduit communicating with the connection hole is provided on the lower surface of the end cap, and an electromagnetic shut-off valve is installed on the conduit.

[0016] By adopting the above technical solution, after the adsorbent desorption and regeneration are completed, the displacement component drives the extension tube to reset upward along the tower body axis, and the synchronous electromagnetic shut-off valve opens. External drying gas is introduced into the connecting pipe through the bottom channel of the extension tube, which purges and replaces the humid gas accumulated in the extension tube and the connecting pipe, ensuring that the residual humid gas inside the tower body is completely discharged, providing a clean and dry initial environment for the next cycle of gas drying process, and effectively ensuring the stability and reliability of the subsequent drying effect.

[0017] Optionally, the cover plate includes a plate frame, sealing plates, columns, and stop plates. The sealing plates are fixedly installed on the plate frame, and their number and position correspond one-to-one with the mesh of the second diverter plate. The stop plates are fixedly installed at the bottom of the columns. There are three columns and three stop plates, and the three columns and stop plates are arranged in a circle on the plate frame.

[0018] Optionally, the displacement assembly includes a mounting frame, an electric telescopic rod, and a fixing block. The mounting frame is fixedly installed on the bottom of the housing, and the electric telescopic rod is fixedly installed on the mounting frame, with its output end fixedly connected to the fixing block. A connecting rod is fixedly connected to the bottom of the first pipe, with the bottom end of the connecting rod penetrating the end cover and extending above the movable block. The connecting rod and the movable block are designed to be detachable.

[0019] Optionally, the transmission connector includes a guide groove and a guide block. The guide groove is inclinedly disposed at the bottom of the inner side wall of the tower body, and the guide block is fixedly connected to the outer side wall of the collar. The guide block and the guide groove are slidably engaged.

[0020] Optionally, a movable block is slidably assembled inside the fixed block, a limit plate is fixedly connected to the top of the movable block, a screw is threaded to one end of the fixed block, and the end of the screw near the connecting rod is rotatably connected to the movable block; a slot is opened at the bottom of the connecting rod, and the limit plate engages with the slot.

[0021] By adopting the above technical solution, the displacement component and the connecting rod can be quickly separated without interfering with the disassembly of the end cap and extension tube, which significantly improves the convenience and labor-saving of subsequent equipment maintenance.

[0022] Optionally, there are two limiting plates, which are symmetrically arranged on the top two sides of the movable block, and the number and position of the slots correspond one-to-one with the two limiting plates.

[0023] By adopting the above technical solution, the force transmission effect of the symmetrically arranged limiting plates and slots makes the force at the bottom of the connecting rod more uniform, thereby ensuring that the extension tube moves smoothly and without deviation along the tower body axis, and significantly improving the stability of its lifting and lowering movement.

[0024] In summary, compared with the prior art, this application includes at least one of the following beneficial technical effects:

[0025] 1. By setting up a diversion and filtration mechanism, the gas to be dried undergoes a multi-stage diversion structure before contacting the adsorbent, achieving uniform airflow distribution. This significantly increases the contact area between the gas and the adsorbent, ensuring sufficient contact between the two and guaranteeing the adsorption and drying effect while improving the utilization rate of the adsorbent. At the same time, this mechanism can further filter the gas, efficiently intercepting impurities such as oil mist and particulate matter, preventing such impurities from causing irreversible contamination of the adsorbent or deterioration of active sites. This not only improves the cleanliness of the output gas but also effectively extends the service life of the adsorbent, reduces the overall operating cost of the equipment, and results in excellent overall performance.

[0026] 2. By combining the extension pipe with the lifting assembly, the regeneration gas rich in water vapor can be effectively blocked during the adsorbent regeneration process, guiding it directly out of the tower through the connecting pipe, reducing the contact between the regeneration gas and other parts of the tower, and avoiding affecting the operational stability of the subsequent adsorption and drying process.

[0027] 3. Through the coordinated action of the lifting components and transmission connectors, the filter element can be driven to periodically switch positions as the extension tube moves downward along the tower axis, ensuring that each filtration area of ​​the filter element can be fully utilized. This not only effectively extends the service life of the filter element but also ensures the stability of its long-term filtration performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of a miniature adsorption dryer according to this application;

[0029] Figure 2 This is a schematic diagram of the internal structure of the shell in this application;

[0030] Figure 3 This is a schematic diagram of the left side of the micro-adsorption dryer of this application.

[0031] Figure 4 This is a schematic cross-sectional view of the tower body during the drying of the gas in this application;

[0032] Figure 5 This is a schematic diagram of the guide groove in this application;

[0033] Figure 6 This is a schematic diagram of the structure of the collar, the first splitter plate, and the second splitter plate in this application;

[0034] Figure 7 This is a cross-sectional structural diagram of the collar, tower body, and filter element in this application;

[0035] Figure 8 This is a schematic diagram of the structure of the first diverter plate in this application;

[0036] Figure 9 This is a schematic diagram of the displacement component in this application;

[0037] Figure 10 This is a schematic diagram of the cover plate in this application;

[0038] Figure 11 This is a schematic diagram of the internal structure of the tower during adsorbent regeneration in this application;

[0039] Figure 12 This is a schematic diagram of the tower structure when the first pipe fitting is backflushed according to this application.

[0040] Explanation of reference numerals in the attached drawings: 1. Shell; 11. Control module; 12. Pressure gauge; 13. Base plate; 131. First switching valve; 132. Second switching valve; 14. Air inlet; 15. Air outlet; 16. Silencer; 2. Valve body; 3. Tower body; 31. Connecting pipe; 311. Opening; 312. Mesh plate; 32. First fitting; 321. Through hole; 33. Second fitting; 34. First diverter plate; 35. Second diverter plate; 36. Cover plate; 361. Plate frame; 3 62. Sealing plate; 363. Column; 364. Stop plate; 4. End cap; 41. Sleeve block; 42. Connecting hole; 421. Conduit; 422. Electromagnetic shut-off valve; 43. Connecting rod; 431. Slot; 5. Collar; 51. One-way bearing; 511. Slot block; 512. Guide groove; 513. Guide block; 52. Filter element; 521. Groove; 6. Mounting bracket; 61. Electric telescopic rod; 62. Fixed block; 63. Movable block; 64. Limiting plate; 65. Screw. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following will be combined with the embodiments of this application. Figures 1-12 The technical solutions of the embodiments of this application are clearly and completely described herein. All other embodiments obtained by those skilled in the art based on the described embodiments are within the scope of protection of this application.

[0042] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 This embodiment provides a miniature adsorption dryer, including a shell 1, a fluid conveying mechanism, a control module 11, a pressure gauge 12, a tower body 3, and a diversion filtration mechanism. The housing 1 serves as the basic supporting unit of the equipment, and the fluid conveying mechanism and control module 11 are both integrated within the housing 1. The fluid conveying mechanism is the core channel for gas transmission, used for the introduction, export, and internal circulation of the gas to be dried and the gas to be regenerated. The control module 11 serves as the control center of the equipment, responsible for timing logic control, actuator driving, and operating condition monitoring. It works with the valve group components to realize the switching of adsorption / regeneration cycles and the control of fluid flow direction and on / off. There are two tower bodies 3, which are symmetrically and spaced apart below the housing 1. Their inner cavities are filled with adsorbent, providing a core adsorption reaction space for gas drying. There are two pressure gauges 12, both fixedly mounted on the outer surface of the housing 1 and connected to the inner cavity of the corresponding tower body 3 through pressure guiding pipelines. They are used to monitor the gas pressure parameters of the corresponding tower body 3 in real time under different operating conditions such as adsorption and regeneration. The diversion filtration mechanism is installed on the inner bottom of each tower body 3 to pre-treat the gas before it comes into contact with the adsorbent, intercepting impurities such as oil mist and particulate matter, and reducing the risk of adsorbent contamination.

[0043] Among them, reference Figure 1 , Figure 2 , Figure 3 and Figure 4The fluid conveying mechanism includes a base plate 13, a first switching valve 131, a second switching valve 132, an air inlet 14, an air outlet 15, a silencer 16, a valve body 2, and a connecting pipe 31. The base plate 13 is fixedly mounted inside the bottom of the housing 1, and has an airflow channel with a preset direction inside. An inlet 14 and an outlet 15 are respectively located on both sides of the base plate 13. The inlet 14 is used to input the gas to be dried into the equipment, and the outlet 15 is used to output the dried gas that meets the standards. A first switching valve 131 and a second switching valve 132 are both mounted on the base plate 13 to control the switching of the corresponding airflow channels, thereby realizing a cyclical mode of alternating operation and regeneration of the two tower bodies 3. A silencer 16 is mounted at the exhaust end of the regenerated gas to attenuate airflow noise during the exhaust process. The valve body 2 is fixedly mounted on the base plate 13, and its internal airflow channel is connected to channels in other parts of the equipment through an air pipe, coordinating with the valve assembly to adjust the gas flow direction and path. Two connecting pipes 31 are provided, respectively installed in the internal chambers of the two tower bodies 3. In this embodiment, the airflow channel arrangement structure inside the base plate 13 and valve body 2 is existing technology and will not be described in detail here.

[0044] During the gas drying stage, the gas to be dried enters from the top inlet of the connecting pipe 31, flows out from the bottom, and is then introduced into the bottom chamber of the corresponding tower body 3, achieving a bottom-up flow of the gas to be dried and ensuring full contact between the gas and the adsorbent in the tower body 3. During the adsorbent regeneration stage, some of the dried gas flowing out from the top of the current working tower body 3 is introduced into the top of another tower body 3 to be regenerated. At this time, the gas flows from top to bottom, and the regenerated gas carrying desorbed water vapor enters from the bottom of the connecting pipe 31 corresponding to the tower body 3, flows upward along the inner cavity of the connecting pipe 31, and finally flows out from the top of the connecting pipe 31. After noise reduction treatment by the silencer 16, it is discharged from the equipment.

[0045] Among them, reference Figure 4 , Figure 6 and Figure 8The diversion filtration mechanism includes a mesh plate 312, an extension tube, a first diversion plate 34, a second diversion plate 35, through holes 321, a filter element 52, and an end cap 4. There are two mesh plates 312, fixed to the top and bottom of the connecting tube 31 respectively, defining the adsorbent filling area. The adsorbent is filled between the two mesh plates 312. The extension tube is coaxially sleeved on the outer side of the bottom end of the connecting tube 31. The first diversion plate 34 is fixed to the bottom of the extension tube, and the second diversion plate 35 is fixed to the top of the extension tube. The first diversion plate 34 has fewer mesh holes than the second diversion plate 35, and the mesh size of the first diversion plate 34 is larger than that of the second diversion plate 35—in this graded pore size gradient design, the smaller pore size and larger size structure of the first diversion plate 34 can… The first flow divider 34 quickly disperses large airflows, reduces initial flow resistance, and avoids localized airflow congestion. The porous, small-sized structure of the second flow divider 35 further refines and evenly distributes the initially dispersed airflow, balancing flow resistance and dispersion effect while ensuring airflow uniformity. Three through holes 321 are evenly arranged circumferentially on the outer bottom of the extension tube. The filter element 52 is fitted onto the outer side of the extension tube, located between the first flow divider 34 and the second flow divider 35. The end cap 4 is detachably mounted to the bottom of the tower body 3 via a threaded connection, used to achieve a sealed bottom. Specifically, the extension tube includes a first fitting 32 and a second fitting 33. The top of the first fitting 32 is threadedly connected to the bottom of the second fitting 33, and the second fitting 33 is fitted onto the outer bottom of the connecting tube 31. Rotating the first fitting 32 separates it from the second fitting 33, allowing the filter element 52 to be removed, making the operation convenient and quick. In this embodiment, the number of through holes 321 can be adjusted according to actual usage requirements.

[0046] The gas exiting from the bottom of the connecting pipe 31 first undergoes primary circumferential dispersion through the circumferentially distributed through-holes 321 on the outer side of the bottom of the extension pipe. Then, the gas flows upward through the first diversion plate 34, where it undergoes secondary diversion. During its continued upward movement, the gas flows through the filter element 52 located between the first diversion plate 34 and the second diversion plate 35, where the filter element 52 efficiently traps impurities such as oil mist and particulate matter. Finally, the gas undergoes a third diversion through the second diversion plate 35, ultimately achieving a uniform distribution in the bottom chamber of the tower body 3. The gas then flows upward through the adsorbent filled inside the tower body 3, where it adsorbs and removes water vapor. This structure, by setting a three-stage diversion structure, ensures that the gas gradually achieves uniform distribution before contacting the adsorbent, guaranteeing sufficient contact between the gas and the adsorbent during its upward movement within the tower body 3. This not only ensures the depth and uniformity of water vapor adsorption but also improves the overall utilization rate of the adsorbent. By adopting a "graded aperture gradient design" instead of a uniform mesh structure, the large-size design of the first diverter plate 34 with fewer holes can quickly disperse large streams of airflow and reduce initial flow resistance, avoiding the local airflow congestion problem that is prone to occur in uniform mesh plates; the small-size design of the second diverter plate 35 with multiple holes can finely distribute the initially dispersed airflow, and ultimately balance the diversion resistance and dispersion effect while ensuring the uniformity of airflow.

[0047] Among them, reference Figure 4 , Figure 6 , Figure 9 , Figure 10 , Figure 11 and Figure 12 The bottom outer side of the connecting pipe 31 has an opening 311 that communicates with the inner cavity of the tower body 3. There are three openings 311 in total. A cover plate 36 is movably connected above the second diverter plate 35. When the cover plate 36 moves along the axial direction of the tower body 3 to fit with the second diverter plate 35, it can seal the mesh of the second diverter plate 35, so that the regenerated gas containing water vapor can directly enter the connecting pipe 31 from the opening 311. A displacement component is provided below the end cap 4. The displacement component is used to drive the extension pipe to move vertically up and down along the axial direction of the tower body 3. A sleeve block 41 is fixedly provided on the upper surface of the end cap 4. The sleeve block 41 is adapted to the through hole 321 and is used to block the through hole 321.

[0048] Specifically, the cover plate 36 includes a plate frame 361, a sealing plate 362, a column 363, and a stop plate 364. The sealing plate 362 is fixedly installed on the plate frame 361, and its number and position correspond one-to-one with the mesh of the second diverter plate 35. The stop plate 364 is fixedly installed at the bottom of the column 363. There are three columns 363 and three stop plates 364. The three columns 363 and the stop plates 364 are arranged in a circle on the plate frame 361. The second diverter plate 35 has a socket adapted to the column 363, and the column 363 is movably installed in the corresponding socket.

[0049] Specifically, the displacement assembly includes a mounting frame 6, an electric telescopic rod 61, and a fixing block 62. The mounting frame 6 is fixedly installed at the bottom of the housing 1, and the electric telescopic rod 61 is fixedly installed on the mounting frame 6, with its output end fixedly connected to the fixing block 62. A connecting rod 43 is fixedly connected to the bottom of the first pipe fitting 32. The bottom end of the connecting rod 43 passes through the end cover 4 and extends above the movable block 63. The movable block 63 is slidably assembled inside the fixing block 62. A limiting plate 64 is fixedly connected to the top of the movable block 63. A screw 65 is threadedly connected to one end of the fixing block 62, and the end of the screw 65 near the connecting rod 43 is rotatably connected to the movable block 63. A slot 431 is provided at the bottom of the connecting rod 43, and the limiting plate 64 engages with the slot 431. There are two limiting plates 64, which are symmetrically arranged on both sides of the top of the movable block 63. The number and position of the slots 431 correspond one-to-one with the two limiting plates 64.

[0050] During the gas drying stage, the second pipe 33 is positioned above the opening 311, achieving a sealed closure of the opening 311. As the drying gas flows upward, the cover plate 36 moves upward under the thrust of the airflow, opening the mesh channel of the second diverter plate 35 to ensure the gas moves upward normally. During the adsorbent regeneration stage, the displacement component drives the second pipe 33 to move downward synchronously with the first pipe 32, making the opening 311 open. The regeneration gas carrying water vapor flows downward, and the airflow pushes the cover plate 36 to reset downward, closing the mesh channel of the second diverter plate 35. At this time, the regeneration gas can directly enter the connecting pipe 31 through the opening 311, flow upward along the connecting pipe 31, and exit the equipment.

[0051] The electric telescopic rod 61 is used to drive the extension tube to move up and down axially along the connecting tube 31. When the extension tube moves down, its bottom inserts into the groove at the top of the sleeve block 41, and the sleeve block 41 seals the through hole 321 to prevent the regeneration gas carrying water vapor from leaking out of the through hole 321. Rotating the screw 65 can drive the movable block 63 to slide inside the fixed block 62. When the limiting plates 64 on both sides of the top of the movable block 63 engage with the slot 431, the displacement component can be connected to the connecting rod 43. At this time, the displacement component can drive the extension tube to move synchronously. When the filter element 52 needs to be replaced, rotate the screw 65 in the opposite direction to disengage the limiting plate 64 from the slot 431 and disconnect it from the connecting rod 43. Loosen the end cap 4 and remove it from below the corresponding tower body 3 to carry out the filter element 52 replacement operation.

[0052] Additionally, refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 11A collar 5 is fitted onto the inner wall of the bottom of the tower body 3. A one-way bearing 51 is fixedly installed on the inner side of the collar 5. Multiple locking blocks 511 are evenly arranged circumferentially on the inner wall of the one-way bearing 51. The bottom outer side of the filter element 52 has grooves 521 that are adapted to the locking blocks 511 one by one. A transmission connector is assembled between the collar 5 and the tower body 3. This transmission connector is used to drive the collar 5 to rotate around the axis of the tower body 3 when the extension tube moves downward along the axial direction of the tower body 3, thereby driving the filter element 52, which is linked with the collar 5, to achieve periodic rotation. Specifically, the transmission connector includes a guide groove 512 and a guide block 513. The guide groove 512 is inclinedly arranged at the bottom of the inner wall of the tower body 3, and the guide block 513 is fixedly connected to the outer wall of the collar 5. The guide block 513 and the guide groove 512 are slidably engaged.

[0053] Because the gas to be dried does not fully distribute before contacting the filter element 52, uneven contact between the filter element 52 and the gas can easily occur, resulting in a low utilization rate of the filter element 52. Therefore, in this embodiment, when the displacement assembly drives the extension tube downwards, the locking block 511 on the outer side of the collar 5 moves along the guide trajectory of the groove 521. Under the limiting and guiding action of the groove 521, the collar 5 drives the one-way bearing 51 to rotate synchronously through the locking block 511, thereby driving the filter element 52 to shift circumferentially relative to the first diverter plate 34, achieving periodic displacement of the filter element 52, ensuring full utilization of each filtration area, and effectively extending its service life. Based on the one-way torque transmission characteristic of the one-way bearing 51, when the displacement assembly drives the extension tube upwards, the one-way bearing 51 and the collar 5 rotate relative to each other. At this time, although the collar 5 rotates under the cooperation of the locking block 511 and the groove 521, the one-way bearing 51 does not transmit torque, and the filter element 52 remains in its shifted position.

[0054] Reference Figure 1 , Figure 3 , Figure 4 and Figure 12 The number of mesh holes and the hole size of the mesh plate 312 are completely consistent with those of the second diverter plate 35; the end cover 4 is provided with a connection hole 42 that communicates with the inner cavity of the tower body 3, and a conduit 421 that communicates with the connection hole 42 is fixedly mounted on the lower surface of the end cover 4. An electromagnetic shut-off valve 422 is connected in series on the conduit 421, and the conduit 421 is kept in communication with the external drying gas source.

[0055] During the adsorbent regeneration process, although the regeneration gas carrying moisture can be discharged through the opening 311 into the connecting pipe 31, some humid gas remains in the bottom area of ​​the connecting pipe 31. During the next cycle of gas drying, this residual humid gas will enter the tower body 3 along with the gas to be dried, increasing the drying load on the adsorbent and affecting the drying efficiency. To address this, this embodiment employs the above structural design. After the adsorbent desorption and regeneration are completed, the displacement component drives the extension pipe to reset and move upward along the axial direction of the tower body 3 by a preset distance, causing the cover plate 36 to rise and seal the mesh of the mesh plate 312. Subsequently, the electromagnetic shut-off valve 422 opens simultaneously, and external drying gas is sequentially introduced into the connecting pipe 31 through the conduit 421 and the connecting hole 42 to purge and replace the humid gas accumulated in the extension pipe and the inner cavity of the connecting pipe 31, ensuring that the residual humid gas inside the tower body 3 is completely discharged. This provides a clean initial environment for the next cycle of gas drying and ensures the stability of the drying effect.

[0056] The implementation principle of a micro adsorption dryer according to an embodiment of this application is as follows:

[0057] When one tower 3 is in the adsorption state, the other tower 3 simultaneously enters the regeneration state; after adsorption is completed, the original regeneration tower 3 enters the adsorption state and the original adsorption tower 3 enters the regeneration state through valve switching, forming a continuous drying process.

[0058] Adsorption-drying stage: The gas to be dried enters from the top inlet of the connecting pipe 31, exits from the bottom, and first undergoes primary circumferential dispersion through the through-hole 321 on the outer side of the bottom of the extension pipe; then it passes through the first diverter plate 34 (small pores, large size) to achieve secondary coarse diversion, reducing the impact intensity of the airflow; then it flows through the filter element 52, which efficiently traps impurities such as oil mist and particulate matter; finally, it undergoes a third fine diversion through the second diverter plate 35 (small pores), ensuring that the gas is evenly distributed in the bottom chamber of the tower body 3. As the airflow flows from bottom to top, it pushes the cover plate 36 upward, opening the mesh channels of the second diverter plate 35; the evenly dispersed gas makes full mass transfer contact with the adsorbent in the tower body 3, and the adsorbent removes water vapor from the gas, thus achieving gas drying.

[0059] Adsorbent regeneration stage: The output end of the electric telescopic rod 61 drives the fixed block 62 to move the movable block 63 downward. The movable block 63 drives the connecting rod 43 to drive the first pipe 32 and the second pipe 33 to move downward synchronously, so that the opening 311 at the bottom of the connecting pipe 31 is open. During the downward movement of the first pipe 32 and the second pipe 33, the bottom of the first pipe 32 is inserted into the top groove of the sleeve block 41, and the sleeve block 41 seals the through hole 321 to prevent the regeneration gas from leaking from the through hole 321 to the bottom space of the tower body 3. At the same time, some of the gas dried by the current working tower body 3 is introduced into the top of the tower body 3 to be regenerated, forming a regeneration airflow from top to bottom. When the regeneration airflow flows from top to bottom, it pushes the cover plate 36 to reset downward, and it fits with the second diverter plate 35 and seals its mesh. The regeneration gas carrying desorbed water vapor cannot enter the bottom filtration area of ​​the tower body 3, and directly enters the connecting pipe 31 through the opening 311, flows upward along the pipe cavity, and is discharged from the equipment through the valve group and the silencer 16.

[0060] Furthermore, when the displacement assembly drives the first pipe 32 and the second pipe 33 to move downward, the guide groove 512 on the inner wall of the tower body 3 and the guide block 513 on the outer side of the collar 5 form a sliding fit, causing the collar 5 to rotate around the axis of the tower body 3; the one-way bearing 51 on the inner side of the collar 5 is engaged with the groove 521 on the outer side of the filter element 52 through the locking block 511. When the collar 5 rotates, the torque is transmitted through the one-way bearing 51, driving the filter element 52 to shift circumferentially relative to the first diverter plate 34, so as to make full use of each filtration area of ​​the filter element 52; when the extension tube moves upward, the one-way bearing 51 rotates relative to the collar 5 due to its one-way torque transmission characteristic, and the one-way bearing 51 does not transmit torque, so the filter element 52 maintains its position after displacement.

[0061] After the adsorbent is regenerated, the displacement component drives the extension tube to reset upward and move it up a preset distance, causing the cover plate 36 to rise and seal the mesh of the mesh plate 312; at the same time, the electromagnetic shut-off valve 422 opens, and the external drying gas source is introduced into the connecting pipe 31 through the conduit 421 and the connecting hole 42 to purge and replace the residual humid gas in the extension tube and the inner cavity of the connecting pipe 31, ensuring that the interior of the tower body 3 is a clean and dry initial environment, and ensuring the drying effect of the next cycle.

[0062] When the filter element 52 needs to be replaced, rotate the screw 65 in the opposite direction so that the movable block 63 drives the limiting plate 64 to disengage from the slot 431 of the connecting rod 43, thereby disconnecting the displacement component from the extension tube; loosen the end cap 4 and remove it from under the tower body 3; rotate the first pipe 32 to separate it from the second pipe 33, and then the filter element 52 can be removed. The operation is efficient and labor-saving.

[0063] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A miniature adsorption dryer, comprising a shell, an inner bottom plate, two symmetrically arranged towers below the bottom plate, and a pressure gauge and a control module mounted on the shell, characterized in that: The housing has an air inlet and an air outlet on both sides, and a silencer is provided at the bottom of one side; a valve body is provided inside the housing, and a first switching valve and a second switching valve are provided on the bottom plate. The tower body has a connecting pipe inside, with mesh plates at both the top and bottom of the connecting pipe, and adsorbent filling the space between the two mesh plates. An extension pipe is coaxially connected to the bottom end of the connecting pipe. A second diverter plate is located at the top of the extension pipe, and a first diverter plate is located at its bottom. The first diverter plate has fewer mesh openings than the second diverter plate, and the mesh size of the first diverter plate is larger than that of the second diverter plate. Multiple through holes are evenly distributed around the bottom end of the extension pipe, and a filter element is placed between the first and second diverter plates. An end cap is located at the bottom end of the tower body. The bottom outer side of the connecting pipe has an opening that communicates with the inner cavity of the tower body. A cover plate is movably connected above the second diverter plate. When the cover plate moves along the axial direction of the tower body to fit with the second diverter plate, it can seal the mesh of the second diverter plate. A displacement component is provided below the end cover. The displacement component is used to drive the extension pipe to move vertically up and down along the axial direction of the tower body. A sleeve block is fixedly provided on the upper surface of the end cover. The sleeve block is adapted to the through hole and is used to block the through hole.

2. The micro-adsorption dryer according to claim 1, characterized in that: The extension tube includes a first fitting and a second fitting. The top of the first fitting is threadedly connected to the bottom of the second fitting, and the second fitting is slidably sleeved on the outside of the bottom of the connecting tube.

3. A miniature adsorption dryer according to claim 2, characterized in that: A collar is fitted on the inner side wall of the bottom of the tower body. A one-way bearing is fixedly installed on the inner side of the collar. Multiple locking blocks are evenly arranged on the inner side wall of the one-way bearing along the circumference. A groove is opened on the outer side of the bottom of the filter element to fit the locking blocks one by one. A transmission connector is assembled between the collar and the tower body. The transmission connector is used to drive the collar to rotate around the axis of the tower body when the extension tube moves downward along the axial direction of the tower body, thereby driving the filter element linked with the collar to achieve periodic rotation.

4. A miniature adsorption dryer according to claim 3, characterized in that: The number of mesh holes and the hole size of the mesh plate are completely consistent with those of the second diverter plate; the end cap is provided with a connection hole that communicates with the inner cavity of the tower body, and a conduit that communicates with the connection hole is provided on the lower surface of the end cap, and an electromagnetic shut-off valve is installed on the conduit.

5. A miniature adsorption dryer according to claim 4, characterized in that: The cover plate includes a plate frame, sealing plates, columns, and stop plates. The sealing plates are fixedly installed on the plate frame, and their number and position correspond one-to-one with the mesh of the second diverter plate. The stop plates are fixedly installed at the bottom of the columns. There are three columns and three stop plates, and the three columns and stop plates are arranged in a circle on the plate frame.

6. A miniature adsorption dryer according to claim 4, characterized in that: The displacement assembly includes a mounting frame, an electric telescopic rod, and a fixing block. The mounting frame is fixedly installed on the bottom of the housing, and the electric telescopic rod is fixedly installed on the mounting frame, with its output end fixedly connected to the fixing block. A connecting rod is fixedly connected to the bottom of the first pipe, and the bottom end of the connecting rod passes through the end cover and extends to the top of the movable block. The connecting rod and the movable block are designed to be detachable.

7. A miniature adsorption dryer according to claim 3, characterized in that: The transmission connector includes a guide groove and a guide block. The guide groove is inclinedly disposed at the bottom of the inner side wall of the tower body, and the guide block is fixedly connected to the outer side wall of the collar. The guide block and the guide groove are slidably engaged.

8. A miniature adsorption dryer according to claim 6, characterized in that: The fixed block has a movable block slidably mounted inside it. The top of the movable block is fixedly connected to a limit plate. One end of the fixed block is threadedly connected to a screw rod. The end of the screw rod near the connecting rod is rotatably connected to the movable block. The bottom of the connecting rod has a slot, and the limit plate engages with the slot.

9. A miniature adsorption dryer according to claim 8, characterized in that: There are two limiting plates, which are symmetrically arranged on the top two sides of the movable block. The number and position of the slots correspond one-to-one with the two limiting plates.

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