A temperature-controlled air drying device

Abstract

This application relates to a temperature-controlled air drying device, belonging to the field of refrigerated air dryer technology. The temperature-controlled air drying device includes an air compressor, a pre-treatment mechanism, a heat exchange dehydration container disposed at the output end of the pre-treatment mechanism, and a refrigeration defrosting mechanism. The pre-treatment mechanism includes a pre-treatment shell, a pre-treatment pipe disposed within the pre-treatment shell, a first separator disposed at the output port of the pre-treatment shell, and a cooling tower for treating circulating water. This application has the effect of improving air drying efficiency and extending the service life of pneumatic equipment.

Description

Technical Field

[0001] This application relates to the field of refrigerated dryer technology, and in particular to a temperature-controlled air drying device. Background Technology

[0002] With the widespread application of pneumatic equipment in industrial production, compressed air has become one of the key power sources in factories. However, moisture in the air is often introduced into the system during compression and transportation. If it is not effectively dehydrated, the moisture will accumulate in the pipes and react with oxygen and other components in the air to accelerate the corrosion of metal pipes and pneumatic components, affecting the service life of the equipment and potentially causing adverse effects on the quality of the air source and the stability of subsequent processes.

[0003] Currently, the industry commonly uses refrigerated dryers to dehydrate compressed air. The core principle is to cool the air to below its dew point temperature using a refrigeration system, causing the gaseous moisture it contains to condense into liquid water. This liquid water is then discharged from the system via separation and drainage devices, resulting in dry, stable compressed air that meets the air quality requirements of various pneumatic equipment and processes within the plant. To further improve the dehydration effect, some dryers incorporate multiple layers of horizontal baffles within the heat exchange container. This allows air to flow repeatedly across the evaporator fins via a tortuous path, extending the heat exchange time and increasing the contact area. The baffles typically have numerous gas passages to distribute airflow and ensure adequate flow area.

[0004] However, the aforementioned refrigerated dryer with baffle structure presents problems in practical applications: when the evaporation temperature is low or the humidity of the processed air is high, the gas passages on the baffle are prone to ice blockage. Due to the high airflow velocity and complex temperature gradient at the passages, the frost layer formed by water vapor condensation accumulates quickly and transforms into ice crystals, causing the cross-section of the passages to gradually shrink or even completely block them. Ice blockage drastically increases airflow resistance, leading to increased back pressure after the compressor and increased system energy consumption; furthermore, blockage disrupts the airflow distribution between the gas storage chambers, causing some areas of air to short-circuit and fail to exchange heat sufficiently with the evaporator, significantly reducing the overall dehydration efficiency. Summary of the Invention

[0005] In order to improve air drying efficiency and extend the service life of pneumatic equipment, this application provides a temperature-controllable air drying device.

[0006] The temperature-controllable air drying device provided in this application adopts the following technical solution:

[0007] A temperature-controllable air drying device includes an air compressor, a pretreatment mechanism, a heat exchange dehydration container disposed at the output end of the pretreatment mechanism, and a refrigeration defrosting mechanism. The pretreatment mechanism includes a pretreatment shell, a pretreatment pipe disposed within the pretreatment shell, a first separator disposed at the output port of the pretreatment shell, and a cooling tower for treating circulating water.

[0008] The refrigeration defrosting mechanism includes a refrigeration compressor, a condenser, and an evaporator;

[0009] The heat exchange dehydration container is provided with several baffles spaced along the height direction. The baffles are provided with gas through holes for gas to pass through and mounting through holes for the evaporator of the refrigeration defrosting mechanism to pass through. A gas storage chamber is formed between adjacent baffles. The evaporator is located in the gas storage chamber. The gas through holes on two adjacent baffles are located on opposite sides of the heat exchange dehydration container.

[0010] The baffle plate is provided with a self-de-icing structure at the gas through hole. The self-de-icing structure includes a memory drive ring that expands when cooled and contracts when heated, a membrane flap assembly that is drivenly connected to the memory drive ring and arranged inside the gas through hole, and peeling teeth provided on the membrane flap assembly.

[0011] By adopting the above technical solution, the gas through holes of adjacent baffles are staggered on opposite sides of the container, and the airflow meanders between the gas storage chambers, extending the heat exchange path between the air and the evaporator, allowing moisture to condense and precipitate fully, and significantly improving the dehydration efficiency. At the same time, a self-de-icing structure is set at the gas through holes. When the gas through holes are frosted and iced due to low temperature, the memory drive ring senses the temperature change and deforms, driving the diaphragm assembly to fold outward. The peeling teeth then apply shearing and peeling action to the ice layer, realizing active de-icing in the through hole area. This alleviates the technical problems of increased airflow resistance, decreased heat exchange efficiency, high energy consumption for global defrosting, and unstable gas supply caused by ice blockage in the through holes of traditional baffles.

[0012] Optionally, the pretreatment pipeline includes a main pretreatment pipe and several branch pretreatment pipes connected to the main pretreatment pipe, wherein the branch pretreatment pipes are arranged parallel to the axial direction of the pretreatment shell.

[0013] The cooling tower includes a tower body structure, a water distribution assembly for the treated cooling water connected to the pretreatment shell, a packing assembly disposed within the tower body structure, and an air circulation assembly disposed at the top of the tower body structure. A water collection tank is disposed at the bottom of the tower body structure, and the cooling water in the water collection tank is pumped to the pretreatment shell.

[0014] By adopting the above technical solution, the pretreatment pipeline is set as a main pipe and several branch pipes arranged parallel to the shell axis, which increases the heat exchange area between compressed air and cooling water, so that the air is effectively cooled in the pretreatment stage, and some moisture is condensed and precipitated in advance, reducing the processing load of the subsequent heat exchange dehydration container.

[0015] Optionally, the refrigeration defrosting mechanism further includes a four-way reversing valve, which enables the refrigeration defrosting mechanism to have a refrigeration mode and a defrosting mode.

[0016] When the refrigeration defrosting mechanism is in refrigeration mode, the refrigeration compressor outputs high-temperature and high-pressure gas, which is sequentially delivered to the condenser and evaporator, and finally circulated back to the refrigeration compressor. When the refrigeration defrosting mechanism is in defrosting mode, the slider of the four-way reversing valve moves, the refrigeration compressor outputs high-temperature and high-pressure gas, which is delivered to the evaporator, and finally circulated back to the refrigeration compressor.

[0017] By adopting the above technical solution, the sliding block of the four-way reversing valve can switch between two modes in the refrigeration system. In refrigeration mode, the compressor outputs high-temperature and high-pressure gas, which releases heat through the condenser and absorbs heat through the evaporator, keeping the evaporator at a low temperature of -15°C to achieve deep freezing and dehydration. In defrosting mode, the four-way reversing valve changes the flow direction, and the high-temperature and high-pressure gas directly enters the evaporator to quickly heat up and melt ice without the need for additional electric heating. This results in high energy utilization efficiency, a compact structure, and simple and reliable control.

[0018] Optionally, the baffle plate has a drive ring groove on the outside of the gas passage for mounting the memory drive ring. The outer wall of the memory drive ring and the inner wall of the drive ring groove are fixed by interference fit. The membrane flap assembly includes four circumferentially arranged membrane flaps. The top of the membrane flaps is provided with a hinge joint. The baffle plate is provided with a hinge groove for the hinge joint to be rotated.

[0019] The top of the hinge joint penetrates the top surface of the baffle plate, the inner wall of the memory drive ring is provided with a drive part, the bottom of the drive part is provided with a drive tooth surface, and the outer wall of the hinge joint is provided with a transmission tooth surface that meshes with the drive tooth surface.

[0020] When the memory drive ring expands during low-temperature phase change, it drives the diaphragm flap to fold outward through the meshing of the drive tooth surface and the transmission tooth surface. When it contracts during high-temperature phase change, it drives the diaphragm flap to retract inward.

[0021] By adopting the above technical solution, the de-icing structure is further disclosed. The outer wall of the memory drive ring is fixed with the inner wall of the drive ring groove by interference fit. Stable installation is achieved by utilizing the temperature characteristics of the memory alloy. The four diaphragm flaps are rotated and engaged with the hinge slot through the hinge joint. The inner drive tooth surface of the memory drive ring meshes with the outer transmission tooth surface of the hinge joint, which accurately converts the radial expansion motion into the diaphragm flap folding motion. The transmission efficiency is high and the action synchronization is good.

[0022] Optionally, the stripping teeth are disposed on the inner sidewall of each membrane flap. The stripping teeth are truncated cones inclined toward the axis of the gas passage. The distribution density of the stripping teeth from top to bottom includes a dense area, a standard area, and a sparse area.

[0023] By adopting the above technical solution, the stripping teeth are set on the inner wall of the flap, in the shape of a truncated cone inclined towards the axis, forming a barbed mechanical interlock with the ice layer. When folding, the force is converted into tensile and shear forces to effectively tear the ice layer. The distribution density of the stripping teeth from top to bottom is in the form of dense area, standard area and sparse area, which ensures the ice-breaking effect in key areas, while avoiding over-design that would increase the weight of the flap or cause excessive movement resistance, thus achieving a balance between performance and structure optimization.

[0024] Optionally, the heat exchange dehydration container is further provided with a gas sampling mechanism, which includes a gas collecting cylinder fixed to the heat exchange dehydration container, a gas sampling arm slidably installed on the gas collecting cylinder, and a docking mechanism for connecting the gas sampling arm and the gas collecting cylinder.

[0025] The gas collecting cylinder passes through the baffle plate, and each gas storage chamber in the side wall of the gas collecting cylinder has a gas intake port. The gas collecting cylinder is equipped with a one-way valve assembly at the gas intake port to control the gas from the gas storage chamber into the gas collecting cylinder in one direction.

[0026] By adopting the above technical solution, the gas sampling mechanism can extract gas from chambers at different heights in stages through a gas collecting cylinder, a gas sampling arm, and a docking mechanism. The gas collecting cylinder runs through all baffle layers, and gas sampling ports are opened on the side walls corresponding to each chamber. A one-way valve controls the gas to enter in one direction to prevent backflow. The gas sampling arm can slide up and down along the gas collecting cylinder and is sealed to the gas sampling ports of different layers through the docking mechanism to extract air of the corresponding dryness level of that layer. This application upgrades a single drying container into a multi-quality gas source supply station. Users can select air with different dew points according to their needs, realizing on-demand gas supply and multi-purpose use of one machine.

[0027] Optionally, the inner wall of the gas collecting cylinder is provided with a guide groove, the outer side of the gas taking arm is provided with a guide slider that slides and cooperates with the guide groove, the gas taking arm is provided with a gas taking channel, the top of the gas taking channel is connected to the gas storage source in the plant, and the bottom is used to connect and transport gas to the gas taking port; the top of the gas collecting cylinder is provided with a lifting drive mechanism for driving the gas taking arm to rise and fall.

[0028] By adopting the above technical solution, the cooperation between the guide slide and the outer guide slider of the gas intake arm ensures that the gas intake arm moves stably without swaying. The top of the gas intake channel inside the gas intake arm is connected to the gas storage source in the plant, and the bottom is used to dock with the gas intake port for delivery. The top lifting drive mechanism converts the rotational motion into the linear motion of the gas intake arm through the motor and lead screw, which can accurately stop at any target layer height, providing a reliable guarantee for the successful docking of the docking mechanism and the gas intake port.

[0029] Optionally, the docking mechanism includes a docking body sealed and installed at the bottom of the gas intake arm, a sealing end slidably installed at the end of the docking body, a push rod slidably installed inside the docking body for pushing the one-way valve assembly, and an electric push rod for driving the push rod to move. The docking body has a docking channel that connects to the gas intake channel.

[0030] The sealing end and the docking body are sealed together, and an elastic sealing ring is provided on the side of the sealing end facing the air intake port. One end of the push rod passes through the docking body and is fixed to the electric push rod, and the other end is fixedly connected to the sealing end. The end of the push rod is provided with a sealing plate for sealing the docking channel. When the air intake arm moves up and down, the push rod seals the docking channel through the sealing plate. When the air intake arm moves to the air intake port position, the electric push rod drives the push rod to move towards the air intake port. The elastic sealing ring first seals against the inner wall of the gas collecting cylinder, and the electric push rod continues to push. The push rod pushes the one-way valve assembly, so that the air intake port and the docking channel are connected.

[0031] By adopting the above technical solution, a reliable connection between the air intake arm and the air intake port is achieved through a docking mechanism. An electric push rod drives the top rod to move horizontally, providing independent and controllable driving force. When the sealing end moves forward, the elastic sealing ring first seals against the inner wall of the air collecting cylinder to establish an initial seal. As the top rod continues to move forward, the sealing disc leaves the docking channel, and simultaneously, the front end pushes open the one-way valve, connecting the air intake port with the docking channel. The timing of the actions ensures sealing before airflow; the sealing disc seals the channel in the non-docked state, preventing leakage during movement. The structure is compact, the operation is reliable, and automatic sealing connection is achieved.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] 1. The drying system consists of an air compressor, a pretreatment unit, a heat exchange dehydration container, and a refrigeration defrosting unit. The pretreatment unit initially cools and removes water from the high-temperature and high-pressure air to reduce the subsequent load. The heat exchange dehydration container achieves deep freezing and dehydration. The refrigeration defrosting unit periodically switches modes to maintain low-temperature dehydration during refrigeration and automatically removes internal frost during defrosting. This solves the problem of reduced efficiency caused by ice blockage during long-term operation of traditional equipment, and achieves continuous, deep, and controllable compressed air drying.

[0034] 2. The self-de-icing structure allows the memory drive ring to deform under temperature changes. The flap assembly retracts to form a smooth through hole during normal operation and folds outward during defrosting. The peeling teeth mechanically interlock with the ice layer, tearing the ice layer off from the inside during folding.

[0035] 3. The gas extraction mechanism enables graded gas extraction from chambers at different heights. The gas extraction arm can slide up and down along the gas collection cylinder and is sealed to the gas extraction ports of different layers through a docking mechanism to extract air of the corresponding dryness level of that layer. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0037] Figure 2 This is a schematic diagram of the internal structure of the pre-processing housing according to an embodiment of this application.

[0038] Figure 3 This is a schematic diagram of the structure of a cooling tower according to an embodiment of this application.

[0039] Figure 4 This is a cross-sectional schematic diagram of the heat exchange dehydration container according to an embodiment of this application.

[0040] Figure 5 yes Figure 4 A schematic diagram of the self-de-icing structure.

[0041] Figure 6 This is a schematic diagram of the gas sampling mechanism according to an embodiment of this application.

[0042] Figure 7 yes Figure 6 A magnified view of a portion of point A in the middle.

[0043] Explanation of reference numerals in the attached drawings: 1. Air compressor; 2. Pretreatment mechanism; 21. Pretreatment shell; 22. Pretreatment pipeline; 221. Main pretreatment pipe; 222. Branch pretreatment pipe; 23. First separator; 24. Cooling tower; 241. Tower structure; 242. Water distribution assembly; 243. Packing assembly; 244. Air circulation assembly; 25. Buffer gas storage tank; 3. Heat exchange dehydration container; 31. Baffle plate; 311. Gas through hole; 312. Mounting through hole; 313. Drive ring groove; 314. Gas storage chamber; 32. Self-de-icing structure; 321. Memory drive ring; 3211. Drive unit; 3212. Drive tooth surface; 322. Diaphragm assembly; 3221. Hinge joint; 3222. Transmission tooth surface; 323. Peeling tooth; 4. Refrigeration defrosting mechanism; 41. Refrigeration compressor; 42. Four-way reversing valve; 43. Condenser; 44. Evaporator; 441. Copper tube; 442. Heat dissipation fins; 5. Gas intake mechanism; 51. Gas collection cylinder; 511. Gas intake port; 512. Annular sealing plane; 513. One-way valve assembly; 514. Guide groove; 52. Gas intake arm; 521. Gas intake channel; 522. Guide slider; 523. Lifting seat; 53. Docking mechanism; 531. Docking body; 5311. Docking channel; 5312. Guide clearance; 5313. Sealing ring groove; 532. Sealing end; 5321. Sliding part; 5322. Elastic sealing ring; 5323. Telescopic sealing strip; 533. Push rod; 5331. Sealing disc; 5332. Connecting rod; 534. Electric push rod; 54. Lifting drive mechanism. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0045] This application discloses a temperature-controllable air drying device.

[0046] Reference Figure 1 A temperature-controllable air drying device includes an air compressor 1, a pretreatment mechanism 2, a heat exchange dehydration container 3, and a refrigeration defrosting mechanism 4.

[0047] Air compressor 1 is a screw-type air compressor in the prior art, which converts ambient air at normal pressure and temperature into high-pressure gas through mechanical work conversion. The absolute amount of water vapor in the gas does not decrease during the compression process, so the absolute amount of water vapor in the compressed gas reaches a saturated state, and the temperature can reach 80°C to 100°C.

[0048] Reference Figure 1 and Figure 2 The pretreatment unit 2 is used to pre-treat the water vapor content of the compressed gas. It includes a pretreatment shell 21, a pretreatment pipe 22 disposed in the pretreatment shell 21, a first separator 23 disposed at the outlet of the pretreatment shell 21, and a cooling tower 24 for treating cooling water. The pretreatment shell 21 is a horizontally arranged cylindrical pressure vessel. The pretreatment pipe 22 includes two main pretreatment pipes 221 that pass through the pretreatment shell 21 respectively, and several branch pretreatment pipes 222 disposed between the two main pretreatment pipes 221. The main pretreatment pipes 221 and the branch pretreatment pipes 222 are connected by multi-port joints.

[0049] If the intervention processing pipes 222 are arranged in a parallel array along the axis of the pretreatment housing 21, and the pretreatment pipes 222 are arranged in a honeycomb pattern within the pretreatment housing 21, the output end of the air compressor 1 is provided with a high-temperature and pressure-resistant metal hose. High-pressure, high-temperature gas is transported through this metal hose to one set of pretreatment main pipes 221, and the other set of pretreatment main pipes 221 is connected to the first separator 23. The first separator 23 is a conventional baffle-type gas-water separator. After preliminary cooling, the gas-water mixture output enters the first separator 23. The internal structure of the first separator 23 causes the airflow to change direction multiple times, and the liquid water is thrown against the wall and falls, collecting at the bottom of the first separator 23.

[0050] The pretreatment housing 21 has inlet and outlet water holes on both sides of its bottom for allowing cooling water to enter and exit, respectively. The heat of the compressed gas is transferred to the flowing cooling water through the pipe wall, thus achieving initial cooling.

[0051] Reference Figure 1 and Figure 3Cooling water output from the outlet is pumped to the cooling tower 24. The cooling tower 24 includes a tower structure 241, a water distribution assembly 242, a packing assembly 243, and an air circulation assembly 244. The cooling tower 24 is installed on the top of the plant. The water distribution assembly 242 includes a vertically arranged water distribution fixed pipe connected to the outlet of the pretreatment shell 21 and multiple sets of rotating arms rotatably mounted on the top of the water distribution fixed pipe. Several nozzles are provided at the bottom of the rotating arms, and water pressure drives the rotating arms to rotate, spraying water evenly from the nozzles. The air circulation assembly 244 is located on the top of the tower structure 241 and includes a fan and fan blades connected to the fan, used to draw air from the cooling tower 24 and make it flow upward. The packing assembly 243 includes multiple sets of packing columns arranged alternately along the height direction, and stacked plastic sheets are provided on the packing columns. The bottom of the tower structure 241 has a water collection pool for collecting the cooled water. The cooled water in the water collection pool is pumped to the water inlet of the pretreatment shell 21 by a pump (the above pumps are all circulating water pumps in the prior art).

[0052] The heat exchange dehydration vessel 3 is used for further drying and dehydration. The pretreated gas also has a buffer storage tank 25 before entering the heat exchange dehydration vessel 3.

[0053] Reference Figure 1 , Figure 4 and Figure 5 The refrigeration defrosting mechanism 4 includes a refrigeration compressor 41, a four-way reversing valve 42, a condenser 43, an evaporator 44, and a throttling element. The structure of the refrigeration compressor 41, condenser 43, evaporator 44, and throttling element is consistent with existing refrigeration systems. The refrigeration compressor 41 and condenser 43 are located outside the heat exchange dehydration container 3, while the evaporator 44 is located inside the heat exchange dehydration container 3. It includes multiple sets of metal copper tubes 441 perpendicular to the ground. In a horizontal cross-section, all the metal copper tubes 441 are arranged in an equilateral triangular grid. Heat dissipation fins 442 are also fixedly welded to the metal copper tubes 441 along their axial direction to increase the contact area between the air and the metal copper tubes 441. The throttling element is an electronic expansion valve that controls the refrigerant circulation flow rate.

[0054] The four-way reversing valve 42 is an electromagnetic reversing slide valve controlled by electromagnetic force and driven by pressure difference, with a sliding slider inside. The four-way reversing valve 42 has four connectors: D, S, C, and E. Port D is connected to the discharge port of the refrigeration compressor 41, port S is connected to the suction port of the compressor, port C is connected to the inlet and outlet ends of the condenser 43, and port E is connected to the inlet and outlet ends of the evaporator 44. The connection and adjustment of the four connectors are achieved by sliding the slider left and right.

[0055] The four-way reversing valve 42 connects the refrigeration compressor 41 with the condenser 43 and the evaporator 44, so that the refrigeration defrosting mechanism 4 has a refrigeration mode and a defrosting mode.

[0056] In refrigeration mode, the slider is on the left, with ports D and C connected, and ports E and S connected. The refrigerant flow direction is as follows: refrigeration compressor 41 discharge port → port D → port C → condenser 43 → throttling element → evaporator 44 → port E → port S → refrigeration compressor 41 suction port. At this time, the high-temperature and high-pressure gaseous refrigerant releases heat and condenses into a high-pressure liquid in the condenser 43. After being throttled and depressurized by the throttling element, it is converted into a low-temperature and low-pressure gas-liquid mixture refrigerant. After entering the evaporator 44, it evaporates and absorbs heat, causing the temperature of the metal copper tube 441 in the heat exchange dehydration container 3 to stabilize below -15℃. It fully exchanges heat with the flowing compressed air, causing water vapor in the air to condense and precipitate, thus achieving freezing and dehydration.

[0057] Switching to defrost mode, the electromagnetic force drives the slider to move to the right, connecting ports D and E, and ports C and S. The refrigerant flows in the following order: compressor 41 discharge port → port D → port E → evaporator 44 → throttling element → condenser 43 → port C → port S → compressor 41 suction port. At this time, the high-temperature, high-pressure gaseous refrigerant output from compressor 41 directly enters evaporator 44. The copper tube 441, acting as the condenser end, releases heat, rapidly heating and melting the ice layer on the tube wall and baffle 31. After releasing heat, the refrigerant, after being throttled and depressurized by the throttling element, enters condenser 43 to evaporate and absorb heat, finally returning to compressor 41 in gaseous form, forming a complete heat pump defrost cycle.

[0058] The heat exchange dehydration container 3 is equipped with a normally closed electromagnetic shut-off valve at the front end of the air inlet. The electromagnetic shut-off valve is electrically connected to the system controller and can be opened and closed synchronously according to the equipment operation mode. The buffer storage tank 25 is equipped with dual air outlet branches. One branch is connected to the drying main branch of the heat exchange dehydration container 3, and the other branch is connected to the emergency pressure stabilization branch of the plant's air storage source. The emergency pressure stabilization branch is equipped with a filter and pre-drying component to ensure continuous and stable air supply to the plant's pneumatic equipment during defrosting.

[0059] After the defrosting program is started, the electromagnetic shut-off valve at the air inlet of the heat exchange dehydration container 3 is first closed to stop compressed air from entering the inner cavity of the heat exchange dehydration container 3. At the same time, the emergency pressure stabilizing branch of the buffer air tank 25 is opened to maintain the continuous supply of air to the plant. Then, the four-way reversing valve 42 completes the reversing, the refrigeration defrosting mechanism 4 switches to the defrosting mode, and the evaporator 44 quickly heats up to defrost.

[0060] Multiple baffles 31 are arranged along the height direction inside the heat exchange dehydration vessel 3, and the baffles 31 are adapted to the inner diameter of the vessel. Each baffle 31 has a gas through-hole 311 for gas to pass through and a mounting through-hole 312 for a copper metal tube 441 to pass through. The gas through-holes 311 on adjacent baffles 31 are located on opposite sides, allowing gas to be transported upwards in a zigzag pattern. A gas storage chamber 314 is formed between adjacent baffles 31.

[0061] Differential pressure sensors are installed at the inlet and outlet of the heat exchange dehydration container 3, respectively. A temperature sensor is installed on the outer wall of the evaporator 44 inside the heat exchange dehydration container 3. Both the differential pressure sensors and the temperature sensors are electrically connected to the system controller. The system controller presets a defrost trigger threshold. When the differential pressure between the inlet and outlet of the heat exchange dehydration container 3 exceeds the set differential pressure threshold, or when the temperature sensor detects that the temperature of the metal copper tube 441 of the evaporator 44 is below -15℃ for a preset duration, the system controller determines that the ice layer accumulation on the surface of the evaporator 44 and the baffle 31 exceeds the limit and automatically starts the defrost program.

[0062] Combination Figure 4 and Figure 5 The baffle 31 has a self-de-icing structure 32 on the gas through hole 311. The self-de-icing structure 32 includes a memory drive ring 321, a diaphragm assembly 322, and a stripping tooth 323 disposed on the diaphragm assembly 322.

[0063] The memory drive ring 321 is a bidirectional shape memory alloy. In this embodiment, the high-temperature phase transition point of the memory drive ring 321 under normal refrigeration and frost-free conditions is -5℃, and the low-temperature phase transition point at the critical temperature of frost and ice blockage is -15℃.

[0064] The baffle 31 has a drive ring groove 313 in the gas through hole 311 for interference fit of the memory drive ring 321. The inner wall of the drive ring groove 313 and the outer wall of the memory drive ring 321 are interference fit.

[0065] When the temperature at the gas through-hole 311 is higher than -5℃, the memory drive ring 321 maintains the high-temperature memory shape and is in a contracted state with an inner diameter of d1.

[0066] When the temperature at the gas through-hole 311 is below -15℃, the memory drive ring 321 undergoes a low-temperature phase transition and automatically switches to a low-temperature memory shape. All the radial expansion deformation is released to the inside, and after the inside expands inward, the inner diameter shrinks to d2, where d2 < d1.

[0067] The membrane flap assembly 322 includes four identical membrane flaps arranged in a vertical arc shape. The entire surface of each flap is coated with a low surface energy polytetrafluoroethylene nano-coating to reduce ice adhesion. A hinge joint 3221 is provided on the side of the membrane flap near the baffle 31. The baffle 31 has a hinge groove for rotating the hinge joint 3221. The top of the hinge groove penetrates the top surface of the baffle 31. A drive portion 3211, corresponding to each of the four membrane flaps, is fixed to the inner wall of the memory drive ring 321. A drive tooth surface 3212 is provided at the bottom of the drive portion 3211, and a transmission tooth surface 3222 meshing with the drive tooth surface 3212 is provided on the outer wall of the hinge joint 3221.

[0068] Under the contraction and clamping action of the memory drive ring 321, the four diaphragm flaps retract inward, forming a circular through-hole coaxial with the gas through-hole 311 on their inner side, ensuring stable airflow in cooling mode. The hinge joint 3221 is also equipped with a torsion spring to assist the diaphragm flaps in quickly resetting after temperature rise, ensuring synchronized action.

[0069] When the gas passage 311 is frosted due to low temperature and the temperature drops below -15℃, the memory drive ring 321 triggers low-temperature phase change radial expansion. Through tooth surface meshing, it drives the four membrane flaps to fold outward synchronously. The peeling teeth 323 on the inner side of the membrane flaps apply shearing, peeling and tearing forces to the ice layer on the inner wall of the passage as the flaps fold, realizing active real-time ice breaking when ice blockage just occurs in the cooling mode, without waiting for the system to switch to the defrosting mode. When the ice layer falls off and the temperature of the gas passage 311 rises back to -5℃, the memory drive ring 321 returns to the contracted state, and the membrane flaps simultaneously close and return to the normal ventilation section.

[0070] The stripping teeth 323 are located on the inner side of the membrane flap and are shaped like a frustum of a cone inclined at 15° toward the axis of the gas through-hole 311, with the inclination direction opposite to the folding direction of the membrane flap. The distribution density of the stripping teeth 323 along the gas flow direction gradually decreases from top to bottom, in the order of dense area, standard area and sparse area.

[0071] To obtain gases at different temperatures, this application also includes a gas sampling mechanism 5. Each gas storage chamber 314 of the heat exchange dehydration container 3 is equipped with a high-precision temperature and humidity sensor and a dew point sensor, which can detect the air parameters in the corresponding chamber in real time and transmit the data to the system controller.

[0072] Reference Figure 4 and Figure 6 The gas taking mechanism 5 includes a gas collecting cylinder 51 disposed in the heat exchange dehydration container 3, a gas taking arm 52 slidably mounted on the gas collecting cylinder 51, and a docking mechanism 53 for connecting the gas taking arm 52 and the gas collecting cylinder 51.

[0073] Combination Figure 6 and Figure 7The gas collecting cylinder 51 is a cylindrical structure vertically installed at the center of the heat exchange dehydration container 3, penetrating all the baffles 31. On the side wall of the gas collecting cylinder 51, corresponding to each gas storage chamber 314, there is a gas inlet 511, penetrating the inner wall of the gas collecting cylinder 51. An annular sealing plane 512 is provided on the outer side of the gas inlet 511 for sealing contact with the docking mechanism 53. A one-way valve assembly 513 is provided on the inner side of the gas inlet 511 facing the gas collecting cylinder 51. The one-way valve assembly 513 is a one-way valve with a built-in mechanical locking structure, including a valve seat, a valve core with a locking buckle, and a compression spring. Under normal conditions, the locking buckle locks the valve core in the closed position, and the valve core cannot be opened regardless of the pressure inside the gas storage chamber 314. The inner wall of the gas collecting cylinder 51 also has two sets of vertical guide grooves 514.

[0074] The gas intake arm 52 is a vertical cylindrical assembly with an internal gas intake channel 521 for conveying the dry gas introduced through the gas intake port 511 upwards. Guide sliders 522, which cooperate with guide grooves 514, are provided on opposite sides of the outer wall of the gas intake arm 52 to improve lifting stability.

[0075] The heat exchange dehydration container 3 is provided with a lifting drive mechanism 54 on the top outer side for driving the air intake arm 52 to rise and fall. The lifting drive mechanism 54 is a servo motor and ball screw drive structure of the prior art. The top of the air intake arm 52 is provided with a lifting seat 523 that is fixed to the screw nut of the lifting drive mechanism 54. The precise movement of the air intake arm 52 is realized by driving the lifting servo motor.

[0076] The docking mechanism 53 is installed at the bottom of the air intake arm 52 for docking and communicating with the air intake port 511. The docking mechanism 53 includes a docking body 531 that is sealed and installed at the bottom of the air intake arm 52, a sealing end 532 that is slidably disposed at the end of the docking body 531, a push rod 533 that is slidably disposed in the docking body 531, and an electric push rod 534 that drives the push rod 533 to move.

[0077] The docking body 531 is a horizontally arranged cylindrical shape, with one end fixedly connected to the air intake arm 52. The docking body 531 has a docking channel 5311 communicating with the air intake channel 521. The inner side of the end of the docking body 531 away from the air intake arm 52 has a guide gap 5312, and the sealing end 532 has a sliding portion 5321 arranged in the guide gap 5312. The outer wall of the sealing end 532 and the opening side of the docking body 531 are dynamically sealed together, ensuring the sealing of the docking channel 5311 and the outside environment during the sliding process.

[0078] An elastic sealing ring 5322 is installed at the end of the sealing end 532 facing the inner wall of the gas collecting cylinder 51. The elastic sealing ring 5322 is used to abut against the annular sealing plane 512. The push rod 533 and the docking body 531 are arranged coaxially. One end of the push rod 533 passes through the docking body 531 and is fixed to the output shaft of the electric push rod 534. The other end of the push rod 533 is provided with a sealing disc 5331. The docking body 531 has a first channel and a second channel in the docking channel 5311. The inner diameter of the first channel is smaller than that of the second channel. The connection between the first channel and the second channel has a sealing ring groove 5313 for sealing and mating with the sealing disc 5331. The end face of the sealing end 532 is provided with a telescopic sealing strip 5323 connected to the docking channel 5311 to ensure the sealing of the docking channel 5311 and the guide gap 5312.

[0079] The push rod 533 has a connecting rod 5332 fixedly connected to the sealing end 532 at one end near the sealing plate 5331. The end of the push rod 533 is located on the side of the elastic sealing ring 5322 away from the gas intake port 511. When the electric push rod 534 drives the sealing end 532 to move, the elastic sealing ring 5322 first abuts against the annular sealing plane 512. After the elastic sealing ring 5322 is compressed, the push rod 533 pushes the valve core of the one-way valve assembly 513, so that the docking channel 5311 and the gas intake port 511 are connected. The gas in the gas storage chamber 314 is transported to the external gas storage bottle along the gas intake port 511, docking channel 5311, and gas intake arm 52.

[0080] The implementation principle of a temperature-controllable air drying device in this application embodiment is as follows: ambient air is compressed into high-temperature, high-pressure saturated humid air by air compressor 1. The high-temperature, high-pressure saturated humid air enters the pretreatment mechanism 2 for pre-cooling and dehydration. Most of the liquid water formed by condensation is separated and discharged by the first separator 23. The pre-dried compressed air is sent to the heat exchange dehydration container 3 after being stabilized by the buffer storage tank 25.

[0081] When the refrigeration defrosting mechanism 4 is in refrigeration mode, the refrigerant absorbs heat inside the evaporator 44 after being throttled and depressurized by the throttling element, so that the heat exchange dehydration container 3 is kept at a low temperature. The compressed air flows along the baffle 31 to complete the deep freezing dehydration.

[0082] The memory drive ring 321 at the position of the gas through hole 311 automatically deforms with temperature changes. In low-temperature environments, the memory drive ring 321 expands to drive the diaphragm assembly 322 to fold and break ice. In high-temperature environments, the memory drive ring 321 contracts and resets to ensure that the gas through hole 311 is unobstructed.

[0083] When the system detects that the pressure difference between the inlet and outlet of the heat exchange dehydration container 3 exceeds the standard and the temperature of the evaporator 44 is continuously lower than the set lower limit through the differential pressure sensor and temperature sensor, it starts the defrosting program. After the defrosting program is started, the electromagnetic shut-off valve at the air inlet of the heat exchange dehydration container 3 is closed, the refrigeration defrosting mechanism 4 switches to defrosting mode, and the high-temperature refrigerant quickly melts the ice layer on the surface of the evaporator 44 and the baffle 31. The melted ice water and ice chips are discharged through the bottom of the heat exchange dehydration container 3. After the defrosting program is completed, the refrigeration defrosting mechanism 4 returns to the refrigeration mode, and the electromagnetic shut-off valve opens to restore air intake.

[0084] The gas extraction mechanism 5 drives the gas extraction arm 52 to move to the target gas storage chamber 314 through the lifting drive mechanism 54, and the docking mechanism 53 unlocks the one-way valve assembly 513 at the corresponding position to accurately extract compressed air of different dryness levels and realize graded gas supply on demand.

[0085] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A temperature controllable air drying device, characterized in that, It includes an air compressor, a pretreatment mechanism, a heat exchange dehydration container disposed at the output end of the pretreatment mechanism, and a refrigeration defrosting mechanism. The pretreatment mechanism includes a pretreatment shell, a pretreatment pipe disposed within the pretreatment shell, a first separator disposed at the output port of the pretreatment shell, and a cooling tower for treating circulating water. The refrigeration defrosting mechanism includes a refrigeration compressor, a condenser, and an evaporator; The heat exchange dehydration container is provided with several baffles spaced along the height direction. The baffles are provided with gas through holes for gas to pass through and mounting through holes for the evaporator of the refrigeration defrosting mechanism to pass through. A gas storage chamber is formed between adjacent baffles. The evaporator is located in the gas storage chamber. The gas through holes on two adjacent baffles are located on opposite sides of the heat exchange dehydration container. The baffle plate is provided with a self-de-icing structure at the gas through hole. The self-de-icing structure includes a memory drive ring that expands when cooling and contracts when heating, a membrane flap assembly that is connected to the memory drive ring and arranged inside the gas through hole, and peeling teeth provided on the membrane flap assembly. The baffle plate has a drive ring groove on the outside of the gas passage for mounting the memory drive ring. The outer wall of the memory drive ring and the inner wall of the drive ring groove are fixed by interference fit. The membrane flap assembly includes four circumferentially arranged membrane flaps. The top of the membrane flaps is provided with a hinge joint. The baffle plate is provided with a hinge groove for the hinge joint to be rotated. The top of the hinge joint penetrates the top surface of the baffle plate, the inner wall of the memory drive ring is provided with a drive part, the bottom of the drive part is provided with a drive tooth surface, and the outer wall of the hinge joint is provided with a transmission tooth surface that meshes with the drive tooth surface. When the memory drive ring expands during low-temperature phase change, it drives the diaphragm flap to fold outward through the meshing of the drive tooth surface and the transmission tooth surface; when it contracts during high-temperature phase change, it drives the diaphragm flap to retract inward. The peeling teeth are disposed on the inner sidewall of each membrane flap. The peeling teeth are truncated cones inclined toward the axis of the gas passage. The distribution density of the peeling teeth from top to bottom includes a dense area, a standard area and a sparse area. The heat exchange dehydration container is also provided with a gas sampling mechanism, which includes a gas collecting cylinder fixed to the heat exchange dehydration container, a gas sampling arm slidably installed on the gas collecting cylinder, and a docking mechanism for connecting the gas sampling arm and the gas collecting cylinder. The gas collecting cylinder passes through the baffle plate, and each gas storage chamber in the side wall of the gas collecting cylinder has a gas intake port. The gas collecting cylinder is equipped with a one-way valve assembly at the gas intake port to control the gas from the gas storage chamber into the gas collecting cylinder in one direction.

2. A temperature controllable air drying device as claimed in claim 1, characterized in that The pretreatment pipeline includes a main pretreatment pipe and several branch pretreatment pipes connected to the main pretreatment pipe, the branch pretreatment pipes being arranged parallel to the axial direction of the pretreatment shell. The cooling tower includes a tower body structure, a water distribution assembly for the treated cooling water connected to the pretreatment shell, a packing assembly disposed within the tower body structure, and an air circulation assembly disposed at the top of the tower body structure. A water collection tank is disposed at the bottom of the tower body structure, and the cooling water in the water collection tank is pumped to the pretreatment shell.

3. The temperature controllable air drying device of claim 1, wherein, The refrigeration defrosting mechanism also includes a four-way reversing valve, which enables the refrigeration defrosting mechanism to have a refrigeration mode and a defrosting mode. When the refrigeration defrosting mechanism is in refrigeration mode, the refrigeration compressor outputs high-temperature and high-pressure gas, which is sequentially delivered to the condenser and evaporator, and finally circulated back to the refrigeration compressor. When the refrigeration defrosting mechanism is in defrosting mode, the slider of the four-way reversing valve moves, the refrigeration compressor outputs high-temperature and high-pressure gas, which is delivered to the evaporator, and finally circulated back to the refrigeration compressor.

4. The temperature controllable air drying device of claim 1, wherein, The inner wall of the gas collecting cylinder is provided with a guide groove, and the outer side of the gas taking arm is provided with a guide slider that slides and cooperates with the guide groove. The gas taking arm is provided with a gas taking channel. The top of the gas taking channel is connected to the gas storage source in the plant, and the bottom is used to connect with the gas taking port for transportation. The top of the gas collecting cylinder is provided with a lifting drive mechanism for driving the gas taking arm to rise and fall.

5. A temperature controllable air drying device as claimed in claim 4, characterized in that The docking mechanism includes a docking body sealed and installed at the bottom of the gas intake arm, a sealed end slidably installed at the end of the docking body, a push rod slidably installed inside the docking body for pushing the one-way valve assembly, and an electric push rod for driving the push rod to move. The docking body has a docking channel that connects to the gas intake channel. The sealing end and the docking body are sealed together, and an elastic sealing ring is provided on the side of the sealing end facing the air intake. One end of the push rod passes through the docking body and is fixed to the electric push rod, and the other end is fixedly connected to the sealing end. The end of the push rod is provided with a sealing disc for sealing the docking channel. When the gas intake arm moves up and down, the push rod seals the docking channel through the sealing plate; when the gas intake arm moves to the gas intake port position, the electric push rod drives the push rod to move towards the gas intake port, the elastic sealing ring first seals against the inner wall of the gas collecting cylinder, the electric push rod continues to push, and the push rod pushes the one-way valve assembly, so that the gas intake port and the docking channel are connected.

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