Multi-tower parallel suction dryer

Abstract

The application discloses a kind of multi-tower parallel type suction dryers, belong to compressed air drying equipment technical field, including base, frame and multiple annular array arrangement adsorption tower, each adsorption tower is connected to corresponding ring pipe by gas inlet, exhaust, regeneration and drainage branch pipe, adopt cam group driven by pneumatic motor as control mechanism, the adsorption and regeneration process of each tower are accurately controlled by cam profile mechanical pressing valve, and the multi-tower cooperative working mode of at least two towers simultaneously adsorbing and at least two towers simultaneously regenerating can be realized;The application solves the output pressure fluctuation problem by multi-tower parallel shunt;Pure mechanical pneumatic control system makes it have intrinsic safety, applicable to explosion-proof and non-electric environment;Combined with adaptive adjustment switching cycle, the energy consumption of system is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of compressed air drying equipment technology, specifically a multi-tower parallel desiccant dryer. Background Technology

[0002] Compressed air is one of the most widely used power sources in modern industry, but the moisture, oil, and other impurities it contains can seriously damage pneumatic equipment, instruments, production processes, and the quality of final products. Adsorption dryers (or simply "dryers") are key equipment for obtaining deeply dried compressed air, typically utilizing adsorbents such as activated alumina and molecular sieves to selectively adsorb water molecules.

[0003] For example, the invention patent with publication number CN209612582U discloses a new type of heatless regeneration desiccant dryer, which solves the problems of complex top pipeline structure and easy blockage of the round hole type distributor by the adsorbent in traditional heatless regeneration desiccant dryers. It mainly consists of a base, adsorption tower, adsorbent, top pipeline, distributor, check valve, sealing gasket, air inlet valve, pressure relief valve, silencer, and electrical mounting bracket, etc.

[0004] However, most mainstream desiccant dryers on the market adopt a dual-tower structure (tower A and tower B). While one tower performs adsorption and drying operations, the other tower performs desorption and regeneration. The working state of the two towers is periodically switched through a timer controller and solenoid valve group. At the moment of switching, the adsorption work is completely transferred from one tower to the other. This process inevitably leads to a brief interruption or drastic change in airflow, causing pressure pulsation in the downstream pipeline network, affecting the operation of precision equipment and stable processes. Moreover, the core control relies on electrical components such as PLCs and solenoid valves. In dangerous environments such as petroleum, chemical, and mining where flammable and explosive gases are present, there is a risk of accidents caused by electrical sparks, which cannot meet the requirements of "intrinsic safety". Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-tower parallel desiccant dryer to solve the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-tower parallel desiccant dryer, comprising:

[0007] The base has a frame fixedly mounted on top of it, and a top plate is fixedly mounted on the top of the frame.

[0008] There are no fewer than six adsorption towers, which are installed on the frame in a ring array. Each adsorption tower is connected to an outlet pipe and a backflush pipe at the top and an inlet pipe and a drain pipe at the bottom.

[0009] An air intake ring pipe and a drain ring pipe are fixed to the bottom of the frame. Each air intake branch pipe is connected to the air intake ring pipe, and each drain branch pipe is connected to the drain ring pipe. Each air intake branch pipe is equipped with an air intake valve, and each drain branch pipe is equipped with a drain valve.

[0010] The exhaust ring pipe and the backflush ring pipe are fixed on the top of the frame. Each exhaust branch pipe is connected to the exhaust ring pipe, and each backflush branch pipe is connected to the backflush ring pipe. Each exhaust branch pipe is equipped with an exhaust valve, and each backflush branch pipe is equipped with a backflush valve. Each inlet branch pipe, drain branch pipe, exhaust branch pipe, and backflush branch pipe is equipped with a one-way valve.

[0011] The cam assembly is fixedly mounted on a rotating shaft, which is rotatably connected between the base and the top plate. The inlet valve, drain valve, outlet valve, and backflush valve are all push-button valves, and their push-button ends are in contact with the side wall of the cam assembly. When the cam assembly rotates, it can control the opening or closing of each valve. At least two inlet valves and outlet valves are open at the same time, and at least two backflush valves and drain valves are open at the same time. When the inlet valves and outlet valves connected to the same adsorption tower are open at the same time, a suction-drying pipeline is formed. When the backflush valves and drain valves connected to the same adsorption tower are open at the same time, a regeneration pipeline is formed. The suction-drying pipeline and the regeneration pipeline connected to the same adsorption tower cannot be opened at the same time.

[0012] The intake ring pipe is connected to the intake manifold, the drain ring pipe is connected to the drain manifold, the exhaust ring pipe is connected to the exhaust manifold, the backflush ring pipe is connected to the exhaust manifold through the return pipe, and a flow valve is installed on the return pipe.

[0013] Preferably, a lower mounting cylinder is fixedly installed on the upper surface of the base, and an upper mounting cylinder is fixedly installed on the lower surface of the top plate. The air inlet valve and the drain valve are both fixedly installed on the outer wall of the lower mounting cylinder, and the air outlet valve and the backflush valve are both fixedly installed on the outer wall of the upper mounting cylinder. The cam assembly includes two first cams and two second cams with the same structure. The two first cams and the two second cams are fixedly connected to the rotating shaft. The two first cams are in the same circumferential position on the rotating shaft, and the two second cams are in the same circumferential position on the rotating shaft. The pressing ends of the air inlet valve and the air outlet valve abut against the side walls of the two first cams, and the pressing ends of the backflush valve and the drain valve abut against the side walls of the two second cams.

[0014] Preferably, the protruding part and the recessed part of the first cam and the second cam are respectively the closing section and the opening section of the valve. When the cam group rotates and the first end of the closing section triggers the valve at the corresponding position to close, the first end of the opening section simultaneously triggers the valve at the corresponding position to open. After the closing section of the first cam closes the air inlet valve and the air outlet valve, the backflush valve and the drain valve connected to the same adsorption tower will be opened by the opening section of the second cam. After the closing section of the second cam closes the backflush valve and the drain valve, the air inlet valve and the air outlet valve connected to the same adsorption tower will be opened by the first cam. The pressing end of the air inlet valve, the air outlet valve, the backflush valve, and the drain valve are all rotatably connected to pulleys.

[0015] Preferably, both the first cam and the second cam are detachably connected with a number of protrusions by screws, and the length ratio of the closing section to the opening section can be adjusted by changing the number of protrusions.

[0016] Preferably, the adsorption tower is provided with a gas distribution component at the bottom, a turbulence component in the middle, and a gravity pressing component at the top. The space between the gas distribution component and the turbulence component, and between the turbulence component and the gravity pressing component, is an adsorbent storage area. The gas distribution component, the turbulence component, and the gravity pressing component can all slide freely along their height direction inside the adsorption tower. The top of the adsorption tower is connected to a detachable top cover by a thread.

[0017] Preferably, the gas distribution assembly includes a first permeable baffle and a support frame, the support frame being fixed to the bottom of the first permeable baffle and the support frame being situated at the bottom of the adsorption tower.

[0018] Preferably, the turbulence-disrupting component includes two second air-permeable baffles connected by a support column, and a propeller-shaped turbulence-disrupting blade is fixedly installed in the middle section of the support column.

[0019] Preferably, the gravity clamping assembly includes a third ventilated partition, and an annular counterweight is fixedly disposed above the third ventilated partition.

[0020] Preferably, a reducer and a pneumatic motor are fixedly installed on the top plate. The driving air source of the pneumatic motor is taken from the main air outlet pipe. The power output end of the pneumatic motor is connected to the power input end of the reducer, and the rotating shaft is connected to the power output end of the reducer.

[0021] Preferably, it also includes a heat exchanger, wherein the low-temperature flow loop of the heat exchanger is connected to the return pipe, and the high-temperature flow loop of the heat exchanger is connected to the intake manifold.

[0022] This invention provides a multi-tower parallel desiccant dryer, which has the following beneficial effects:

[0023] This invention employs a working mode of parallel adsorption by at least two adsorption towers. When one adsorption tower completes its adsorption cycle and needs to switch to regeneration, at least another adsorption tower is already in the adsorption process and continuously supplying gas. This avoids the airflow interruption and pressure pulsation caused by single tower operation and valve opening and closing during traditional dual-tower switching. Through the mechanical timing control of the cam group, a smooth switching between the adsorption process and the regeneration process is achieved, thereby providing dry compressed air with small pressure fluctuations and continuous stability, effectively protecting downstream precision gas-using equipment.

[0024] The control system is implemented by a cam assembly with a purely mechanical structure. The drive source is a pneumatic motor, and the power source is the dry gas processed by the equipment itself. It eliminates the traditional electrical control components such as PLC and solenoid valve, thus eliminating the risk of electric sparks. This invention is particularly suitable for dangerous places with strict explosion-proof requirements, such as petroleum, chemical, mining, and pharmaceutical industries.

[0025] By changing the number of bumps, the number of adsorption towers in the adsorption or regeneration process can be adjusted, allowing for flexible changes in the number of adsorption and regeneration towers (e.g., from 3 adsorption and 2 regeneration to 2 adsorption and 3 regeneration) to adapt to different seasons (air humidity changes) or different dew point requirements.

[0026] The speed of the pneumatic motor adapts to the volume of air processed, realizing "on-demand regeneration" based on the load, avoiding energy waste (over-regeneration) or poor performance (under-regeneration) under fixed cycles.

[0027] By connecting multiple towers in parallel to share the total gas volume, the gas flow rate within a single tower is significantly reduced. Combined with gravity compression components, this effectively suppresses collisions and friction between adsorbent particles, greatly reducing adsorbent pulverization at the source, extending its service life, and ensuring the cleanliness of the output air. Attached Figure Description

[0028] Figure 1 This is a perspective view of the present invention;

[0029] Figure 2 This is a perspective view of the internal structure of the present invention;

[0030] Figure 3 A three-dimensional view of the cam assembly;

[0031] Figure 4 This is a perspective view of the first cam in this invention;

[0032] Figure 5 This is a perspective view of the second cam in this invention;

[0033] Figure 6 This is a 3D view of the internal structure of the adsorption tower;

[0034] Figure 7 This is a schematic diagram of the pipeline connection system of the present invention.

[0035] In the diagram: 1. Base; 2. Frame; 3. Adsorption tower; 4. Outlet branch pipe; 5. Backflush branch pipe; 6. Inlet branch pipe; 7. Drainage branch pipe; 8. Outlet ring pipe; 9. Inlet ring pipe; 10. Backflush ring pipe; 11. Drainage ring pipe; 12. Top plate; 13. Lower mounting cylinder; 14. Upper mounting cylinder; 15. Inlet valve; 16. Drain valve; 17. Outlet valve; 18. Backflush valve; 19. Check valve; 20. Shaft; 21. Main inlet pipe ; 22. Drain main pipe; 23. Air outlet main pipe; 24. Return pipe; 25. Flow valve; 26. First cam; 27. Second cam; 28. Pulley; 29. ​​Protrusion; 30. Top cover; 31. First venting baffle; 32. Support frame; 33. Second venting baffle; 34. Support column; 35. Baffle blade; 36. Third venting baffle; 37. Annular counterweight; 38. Heat exchanger; 39. Reducer; 40. Pneumatic motor. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] Please see Figures 1-7 This invention provides a technical solution: a multi-tower parallel desiccant dryer, comprising:

[0038] A base 1, on which a frame 2 is fixedly installed, and a top plate 12 is fixedly installed on the top of the frame 2;

[0039] There are no fewer than six adsorption towers 3, which are installed on the frame 2 in a ring array. Each adsorption tower 3 is connected to an outlet pipe 4 and a backflush pipe 5 at the upper end and to an inlet pipe 6 and a drain pipe 7 at the lower end.

[0040] The air intake ring pipe 9 and the drain ring pipe 11 are fixed at the bottom of the frame 2. Each air intake branch pipe 6 is connected to the air intake ring pipe 9, and each drain branch pipe 7 is connected to the drain ring pipe 11. Each air intake branch pipe 6 is equipped with an air intake valve 15, and each drain branch pipe 7 is equipped with a drain valve 16.

[0041] The exhaust ring pipe 8 and the backflush ring pipe 10 are fixed above the frame 2. Each exhaust branch pipe 4 is connected to the exhaust ring pipe 8, and each backflush branch pipe 5 is connected to the backflush ring pipe 10. Each exhaust branch pipe 4 is equipped with an exhaust valve 17, and each backflush branch pipe 5 is equipped with a backflush valve 18. Each inlet branch pipe 6, drain branch pipe 7, exhaust branch pipe 4, and backflush branch pipe 5 is equipped with a one-way valve 19. The one-way valve 19 is used to prevent gas backflow.

[0042] The cam assembly is fixedly mounted on the rotating shaft 20, which is rotatably connected between the base 1 and the top plate 12. The inlet valve 15, drain valve 16, outlet valve 17, and backflush valve 18 are all push-button valves, and their push-button ends are in contact with the side wall of the cam assembly. When the cam assembly rotates, it can control the opening or closing of each valve. At least two inlet valves 15 and outlet valves 17 are open at the same time to ensure that at least two adsorption towers 3 can perform the adsorption process at the same time. At least two backflush valves 18 and drain valves 16 are open at the same time to ensure that at least two adsorption towers 3 can perform the regeneration work at the same time. When the inlet valves 15 and outlet valves 17 connected to the same adsorption tower 3 are open at the same time, a suction-drying pipeline is formed. When the backflush valves 18 and drain valves 16 connected to the same adsorption tower 3 are open at the same time, a regeneration pipeline is formed. The suction-drying pipeline and the regeneration pipeline connected to the same adsorption tower 3 cannot be opened at the same time to avoid the suction-drying pipeline and the regeneration pipeline being connected.

[0043] The intake ring pipe 9 is connected to the intake manifold 21. Undried compressed air can enter each intake branch pipe 6 through the intake manifold 21 and the intake ring pipe 9. The drain ring pipe 11 is connected to the drain manifold 22. The gas-water mixture discharged from each drain branch pipe 7 can be discharged outside the equipment through the drain ring pipe 11 and the drain manifold 22. The outlet ring pipe 8 is connected to the outlet manifold 23. The dried air discharged from each outlet branch pipe 4 can be discharged outside the equipment through the outlet ring pipe 8 and the outlet manifold 23. The backflush ring pipe 10 is connected to the outlet manifold 23 through the return pipe 24. The dried air in the outlet manifold 23 can be introduced into the backflush ring pipe 10 through the return pipe 24, and then introduced into the adsorption tower 3 for regeneration through each backflush branch pipe 5. A flow valve 25 is installed on the return pipe 24. The flow valve 25 can be used to adjust the flow rate of the dried gas entering the return pipe 24.

[0044] In one embodiment of the present invention, a lower mounting cylinder 13 is fixedly installed on the upper surface of the base 1, and an upper mounting cylinder 14 is fixedly installed on the lower surface of the top plate 12. An air inlet valve 15 and a drain valve 16 are both fixedly installed on the outer wall of the lower mounting cylinder 13, and an air outlet valve 17 and a backflush valve 18 are both fixedly installed on the outer wall of the upper mounting cylinder 14. The cam assembly includes two identical first cams 26 and two identical second cams 27. The two first cams 26 and the two second cams 27 are all fixedly connected to a rotating shaft 20. Rotation of the rotating shaft 20 can drive the two first cams 26 and the two second cams 27 to rotate simultaneously. The first cams 26 are in the same circumferential position on the rotating shaft 20, and the two second cams 27 are in the same circumferential position on the rotating shaft 20. The pressing ends of the inlet valve 15 and the outlet valve 17 abut against the side walls of the two first cams 26, and the pressing ends of the backflush valve 18 and the drain valve 16 abut against the side walls of the two second cams 27. This allows the rotating shaft 20 to drive the two first cams 26 and the two second cams 27 to rotate, and according to the contour of the cams, to open or close the inlet valve 15, drain valve 16, outlet valve 17, and backflush valve 18 connected to each adsorption tower 3, thereby controlling each adsorption tower 3 to perform the adsorption process and the regeneration process.

[0045] As an embodiment of the present invention, please refer to Figure 7 The protruding and recessed portions of the first cam 26 and the second cam 27 are respectively the closing and opening sections of the valve. When the cam assembly rotates, causing the first end of the closing section to trigger the corresponding valve to close, the first end of the opening section simultaneously triggers the corresponding valve to open, ensuring that when the valve on one adsorption tower 3 is closed or opened, the valve on the other adsorption tower 3 can open or close simultaneously, ensuring the stability of the airflow. The inlet valve 15, drain valve 16, outlet valve 17, and backflush valve 18 are all linear flow regulating valves. When the closing section of the first cam 26... After the air valve 15 and the outlet valve 17 are closed, the backflush valve 18 and the drain valve 16 connected to the same adsorption tower 3 will be opened by the opening section of the second cam 27. After the closing section of the second cam 27 closes the backflush valve 18 and the drain valve 16, the inlet valve 15 and the outlet valve 17 connected to the same adsorption tower 3 will be opened by the first cam 26. This prevents the dry gas and the regenerated gas from mixing in the adsorption tower 3. The pressing ends of the inlet valve 15, the outlet valve 17, the backflush valve 18, and the drain valve 16 are all rotatably connected to pulleys 28 to reduce the friction with the cam assembly.

[0046] As an embodiment of the present invention, both the first cam 26 and the second cam 27 are detachably connected with a number of protrusions 29 by screws. The length ratio of the closed section to the open section can be adjusted by changing the number of protrusions 29.

[0047] As an embodiment of the present invention, an air distribution component is provided at the bottom of the adsorption tower 3, a turbulence component is provided in the middle, and a gravity pressing component is provided at the top. The space between the air distribution component and the turbulence component, and between the turbulence component and the gravity pressing component, is the adsorbent storage area. The air distribution component, the turbulence component, and the gravity pressing component can all slide freely in the height direction within the adsorption tower 3. The top of the adsorption tower 3 is connected to a detachable top cover 30 by a thread. After the adsorption tower 3 is removed, the adsorbent inside can be replaced by opening the top cover 30. The air distribution component, the turbulence component, and the gravity pressing component can be removed and replaced for maintenance at the same time.

[0048] As an embodiment of the present invention, the gas distribution assembly includes a first permeable baffle 31 and a support frame 32. The support frame 32 is fixed to the bottom of the first permeable baffle 31 and is located at the bottom of the adsorption tower 3. When the gas enters the bottom of the adsorption tower 3, it can form a gas distribution effect through the first permeable baffle 31 to prevent the gas from concentrating on the adsorbent above.

[0049] As an embodiment of the present invention, the turbulence component includes two second air-permeable baffles 33, which are connected by a support column 34. A propeller-shaped turbulence blade 35 is fixedly arranged in the middle of the support column 34. A cavity is formed between the two second air-permeable baffles 33. When gas passes through the cavity, the turbulence blade 35 can cause the gas to swirl and mix, break the gas laminar boundary layer, redistribute the gas, reduce channeling, and improve the overall utilization rate of the adsorbent.

[0050] As an embodiment of the present invention, the gravity pressing component includes a third ventilated partition 36, and an annular counterweight 37 is fixedly disposed above the third ventilated partition 36. The adsorbent below is pressed by the weight generated by the annular counterweight 37, so that the adsorbent particles are in closer contact, and the adsorbent particles are prevented from colliding and rubbing against each other under the blowing of gas, thereby reducing the generation of dust.

[0051] As an embodiment of the present invention, a reducer 39 and a pneumatic motor 40 are fixedly installed on the top plate 12. The driving air source of the pneumatic motor 40 is taken from the main outlet pipe 23. The power output end of the pneumatic motor 40 is connected to the power input end of the reducer 39, and the rotating shaft 20 is connected to the power output end of the reducer 39. By connecting the pneumatic motor 40 to the main outlet pipe 23, the rotation speed of the cam group can be adaptively adjusted according to the gas processing displacement, thereby realizing the automatic control of the drying time and regeneration time of each adsorption tower 3 according to the gas processing displacement.

[0052] As an embodiment of the present invention, it also includes a heat exchanger 38. The low-temperature flow loop of the heat exchanger 38 is connected to the return pipe 24, and the high-temperature flow loop of the heat exchanger 38 is connected to the inlet main pipe 21. When the air compressor discharges gas with temperature into the inlet main pipe, the heat exchanger 38 can transfer the heat to the return pipe 24, thereby raising the temperature of the backflushing gas and improving the regeneration efficiency of the adsorption tower 3.

[0053] The working principle and usage process of this invention are as follows: In use, the gas discharged from the air compressor first enters the intake ring pipe 9 through the intake main pipe 21. The gas in the intake ring pipe 9 will enter the adsorption tower 3 through no less than two intake branch pipes 6 for adsorption. At this time, no less than two adsorption towers 3 will carry out the adsorption process simultaneously. By having multiple adsorption towers 3 carry out the adsorption process simultaneously, the gas flow rate in a single adsorption tower 3 will be reduced, the gas flow velocity will be reduced, and the gas can contact the adsorbent for a longer time, thereby improving the drying effect of the adsorption tower 3. After drying, the gas will enter the outlet ring pipe 8 through the outlet branch pipe 4, and finally be discharged through the outlet main pipe 23. Part of the dry gas in the main outlet pipe 23 can enter the backflush ring pipe 10 through the return pipe 24. The flow rate of the gas entering the return pipe 24 can be adjusted by the flow valve 25. The gas in the backflush ring pipe 10 will enter the adsorption tower 3 for regeneration through no less than two backflush branch pipes 5. At this time, no less than two adsorption towers 3 will undergo regeneration simultaneously. The gas-water mixture discharged from the adsorption tower 3 will enter the drain ring pipe 11 through the drain branch pipe 7, and finally be discharged from the equipment through the main drain pipe 22. The gas flowing in the main outlet pipe 23 can drive the pneumatic motor 40 to rotate, and the pneumatic motor 40 will drive the cam assembly on the rotating shaft 20 to rotate. The opening and closing of each inlet valve 15, drain valve 16, outlet valve 17, and backflush valve 18 are simultaneously controlled by rotating the cam assembly. This allows for automatic adaptive adjustment of the cam assembly's rotation speed based on the gas throughput. The rotation speed of the cam assembly controls the duration of both the adsorption and regeneration processes. Furthermore, the length ratio of the closed and open sections can be adjusted by changing the number of protrusions 29, thereby adjusting the number of adsorption towers 3 in either the adsorption or regeneration process. This allows for flexible changes in the number of adsorption and regeneration processes (e.g., from 3 adsorption / regeneration processes to 2 adsorption / regeneration processes) to adapt to different seasons. The system can adapt to changes in air humidity or different dew point requirements. By installing a heat exchanger 38, the air compressor can discharge warm gas to heat the backflushing gas in the return pipe 24, thereby improving the regeneration efficiency of the adsorption tower 3. The gravity compression component installed in the adsorption tower 3 can compress the adsorbent below, making the contact between adsorbent particles more compact and preventing adsorbent particles from colliding and rubbing against each other under the blowing of gas, thus reducing dust generation. The gas distribution component can prevent the gas entering the adsorption tower 3 from concentrating and contacting the adsorbent. The flow around the gas can break the gas laminar boundary layer, redistribute the gas, reduce channeling, and improve the overall utilization rate of the adsorbent.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-tower parallel desiccant dryer, characterized in that, include: A base (1) is fixedly mounted on top of a frame (2), and a top plate (12) is fixedly mounted on the top of the frame (2); Adsorption towers (3), numbering no less than six, are installed on the frame (2) in a ring array. Each adsorption tower (3) has an outlet pipe (4) and a backflush pipe (5) connected to its upper end, and an inlet pipe (6) and a drain pipe (7) connected to its lower end. An air intake ring pipe (9) and a drain ring pipe (11) are fixed at the bottom of the frame (2). Each of the air intake branch pipes (6) is connected to the air intake ring pipe (9), and each of the drain branch pipes (7) is connected to the drain ring pipe (11). Each of the air intake branch pipes (6) is equipped with an air intake valve (15), and each of the drain branch pipes (7) is equipped with a drain valve (16). The exhaust ring pipe (8) and the backflush ring pipe (10) are fixed above the frame (2). Each exhaust branch pipe (4) is connected to the exhaust ring pipe (8), and each backflush branch pipe (5) is connected to the backflush ring pipe (10). Each exhaust branch pipe (4) is equipped with an exhaust valve (17), and each backflush branch pipe (5) is equipped with a backflush valve (18). Each air inlet branch pipe (6), drain branch pipe (7), exhaust branch pipe (4), and backflush branch pipe (5) are equipped with a one-way valve (19). The cam assembly is fixedly installed on the rotating shaft (20), which is rotatably connected between the base (1) and the top plate (12). The air inlet valve (15), drain valve (16), air outlet valve (17), and backflush valve (18) are all push-type valves, and their push-ends are in contact with the side wall of the cam assembly. When the cam assembly rotates, it can control the opening or closing of each valve. At least two air inlet valves (15) and air outlet valves (17) are open at the same time, and at least two backflush valves (18) and drain valves (16) are open at the same time. When the air inlet valves (15) and air outlet valves (17) connected to the same adsorption tower (3) are opened at the same time, a suction drying pipeline is formed. When the backflush valves (18) and drain valves (16) connected to the same adsorption tower (3) are opened at the same time, a regeneration pipeline is formed. The suction drying pipeline and the regeneration pipeline connected to the same adsorption tower (3) cannot be opened at the same time. The intake ring pipe (9) is connected to the intake manifold (21), the drain ring pipe (11) is connected to the drain manifold (22), the exhaust ring pipe (8) is connected to the exhaust manifold (23), the backflush ring pipe (10) is connected to the exhaust manifold (23) through the return pipe (24), and the return pipe (24) is equipped with a flow valve (25); A lower mounting cylinder (13) is fixedly installed on the upper surface of the base (1), and an upper mounting cylinder (14) is fixedly installed on the lower surface of the top plate (12). The air inlet valve (15) and the drain valve (16) are both fixedly installed on the outer wall of the lower mounting cylinder (13), and the air outlet valve (17) and the backflush valve (18) are both fixedly installed on the outer wall of the upper mounting cylinder (14). The cam assembly includes two first cams (26) with the same structure and two second cams (27) with the same structure. The two first cams (26) and two second cams (27) are fixedly connected to the rotating shaft (20). The two first cams (26) are in the same circumferential position on the rotating shaft (20), and the two second cams (27) are in the same circumferential position on the rotating shaft (20). The pressing ends of the air inlet valve (15) and the air outlet valve (17) abut against the side walls of the two first cams (26), and the pressing ends of the backflush valve (18) and the drain valve (16) abut against the side walls of the two second cams (27). The protruding part and the recessed part of the first cam (26) and the second cam (27) are respectively the closing section and the opening section of the valve. When the cam group rotates and the first end of the closing section triggers the valve at the corresponding position to close, the first end of the opening section triggers the valve at the corresponding position to open at the same time. When the closing section of the first cam (26) closes the air inlet valve (15) and the air outlet valve (17), the backflush valve (18) and the drain valve (16) connected to the same adsorption tower (3) will be opened by the opening section of the second cam (27). When the closing section of the second cam (27) closes the backflush valve (18) and the drain valve (16), the air inlet valve (15) and the air outlet valve (17) connected to the same adsorption tower (3) will be opened by the first cam (26). The pressing end of the air inlet valve (15), the air outlet valve (17), the backflush valve (18), and the drain valve (16) are all rotatably connected to pulleys (28). Both the first cam (26) and the second cam (27) are connected to a number of protrusions (29) by screws. The length ratio of the closed section to the open section can be adjusted by changing the number of protrusions (29).

2. The multi-tower parallel desiccant dryer according to claim 1, characterized in that, The adsorption tower (3) is equipped with a gas distribution component at the bottom, a turbulence component in the middle, and a gravity pressing component at the top. The space between the gas distribution component and the turbulence component, as well as between the turbulence component and the gravity pressing component, is the adsorbent storage area. The gas distribution component, the turbulence component, and the gravity pressing component can all slide freely along their height direction inside the adsorption tower (3). The top of the adsorption tower (3) is connected to a detachable top cover (30) by a thread.

3. A multi-tower parallel desiccant dryer according to claim 2, characterized in that, The air distribution assembly includes a first air-permeable baffle (31) and a support frame (32). The support frame (32) is fixed to the bottom of the first air-permeable baffle (31) and sits at the bottom of the adsorption tower (3).

4. A multi-tower parallel desiccant dryer according to claim 2, characterized in that, The turbulence-disrupting component includes two second air-permeable baffles (33), which are connected by a support column (34). A propeller-shaped turbulence-disrupting blade (35) is fixedly installed in the middle section of the support column (34).

5. A multi-tower parallel desiccant dryer according to claim 2, characterized in that, The gravity clamping assembly includes a third ventilated partition (36), and an annular counterweight (37) is fixedly disposed above the third ventilated partition (36).

6. A multi-tower parallel desiccant dryer according to claim 1, characterized in that, A reducer (39) and a pneumatic motor (40) are fixedly installed on the top plate (12). The driving air source of the pneumatic motor (40) is taken from the main air outlet (23). The power output end of the pneumatic motor (40) is connected to the power input end of the reducer (39). The rotating shaft (20) is connected to the power output end of the reducer (39).

7. A multi-tower parallel desiccant dryer according to claim 1, characterized in that, It also includes a heat exchanger (38), the low-temperature flow loop of which is connected to the return pipe (24), and the high-temperature flow loop of which is connected to the inlet manifold (21).

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