Heatless regeneration air drying system for locomotive and control method of heatless regeneration air drying system

Abstract

A heatless regeneration air drying system for a locomotive comprises a tower, a lower cover is arranged in the middle of the tower, two groups of drying towers are mounted on the lower cover, an exhaust pipeline communicated with the two groups of drying towers and used for exhausting dry air is integrated in the lower cover, and a valve block is fixed at the bottom of the lower cover. A pipeline is arranged in the valve block, a pneumatic combination valve for controlling wet air to enter the drying towers and controlling waste gas containing water, oil and impurities to be discharged out of the drying towers is integrated in the valve block, the pneumatic combination valve is communicated with the two drying towers through the pipeline on the valve block, and an electromagnetic valve set for controlling the pneumatic combination valve to act and an electric controller for controlling the electromagnetic valve set are installed on the tower frame. Each group of drying towers is formed by connecting two tower bodies in series, an adsorbent and an oil-water separator positioned below the adsorbent are arranged in each tower body, and the four tower bodies are distributed on the lower cover in a rectangular shape. The requirements for large air volume and long air using time of a locomotive braking system are met, the space occupancy rate is small, the pipeline structure is simple, and maintenance and overhaul are convenient. The invention further provides a control method of the heatless regeneration air drying system for the locomotive.

Description

Technical Field

[0001] The invention relates to a heatless regeneration air drying system for a locomotive, belonging to the technical field of air drying of vehicle pneumatic devices. Background Art

[0002] When using a gas drying and purification system to dry and purify the power gas of a locomotive brake system, a dual-tower switching state design mode is often used so that dual towers with the same structure take turns to perform drying and purification of the power gas. When one tower enters the adsorption purification working state, the other tower enters the regeneration reset state to complete the next drying and purification operation. The state durations set for the dual towers are equal to improve the drying and purification efficiency, reduce the workload of a single tower, and ensure the automation level of the entire gas drying and purification instrument. At present, in order to meet the air drying needs of heavy loads, large air volume, and long air usage time, multiple air drying towers are installed, which brings the following problems: 1. Multiple drying towers or adsorption towers occupy a large space, require high installation space, and have complex pipeline layouts, making maintenance and repair difficult.

[0003] 2. Pneumatic valves are important components of the drying system, which generally include actuators and valves. The valve of the pneumatic valve can be opened by introducing air source into the actuator of the pneumatic valve as the power source of the pneumatic valve. In an environment with large temperature changes, if the pneumatic valve encounters extremely cold weather, it will cause the pneumatic valve to move slowly and get stuck, causing the equipment to trip and malfunction, reducing the stability of the drying system.

[0004] 3. The fixed value of the regeneration throttle hole size is difficult to match various regeneration conditions.

[0005] 4. When the dual-tower switching time is maintained relatively short in an environment with high humidity, the drying and purification effect will be poor and cannot meet expectations, which will cause the power gas of the locomotive braking system to be too humid and even condensation corrosion, seriously affecting the working performance of the locomotive braking system and the service life of the air intake reversing valve between the tower bodies. On the contrary, when the dual-tower switching time is maintained relatively long in an environment with low humidity, the drying efficiency will be reduced and compressed air will be lost. Summary of the invention

[0006] The heatless regeneration air drying system for locomotives provided by the present invention meets the requirements of large air volume and long air use time of the locomotive brake system, forming an air drying system with compact structure, high integration, small space occupancy rate and simple pipeline structure, reducing the space requirements for installation and layout of the air drying system, and facilitating maintenance and repair, adapting to different regeneration working conditions, avoiding slow action or stagnation of the pneumatic combination valve due to the low temperature of the valve block in extremely congested weather, and improving the control reliability and environmental adaptability of the entire system. The present invention also provides a control method for the heatless regeneration air drying system for locomotives.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: A heatless regeneration air drying system for locomotives comprises a tower frame, a lower cover in the middle of the tower frame, two groups of drying towers are mounted on the lower cover, and the system is characterized in that: an exhaust pipeline for connecting the two groups of drying towers and used for exhausting dry air is integrated in the lower cover, a valve block is fixed at the bottom of the lower cover, a pipeline is provided in the valve block and a pneumatic combination valve for controlling the entry of wet air into the drying tower and the exhaust gas containing water and oil impurities to be discharged from the drying tower is integrated, the pneumatic combination valve is respectively connected to the two groups of drying towers through the pipeline on the valve block, an electromagnetic valve group for controlling the action of the pneumatic combination valve and an electric controller for controlling the electromagnetic valve group are installed on the tower frame, each group of drying towers is formed by two tower bodies connected in series, an adsorbent and an oil-water separator located below the adsorbent are installed in the tower body, and four tower bodies are distributed in a rectangular shape on the lower cover.

[0008] Preferably, the exhaust pipeline includes a regeneration pipeline connecting two groups of drying towers and an outlet pipeline connected in parallel with the regeneration pipeline, the outlet pipeline has an outlet end that can be connected to the locomotive braking system, two check valves with opposite opening directions are installed on the outlet pipeline, one check valve is connected to one group of drying towers and opens with the exhaust of the drying towers, and the other check valve is connected to the other group of drying towers and opens with the exhaust of the other group of drying towers. A humidity display with a detection end extending to the outlet end of the outlet pipeline is installed on the lower cover.

[0009] Preferably, the regeneration pipeline is provided with a regeneration valve core for adjusting the gas flow rate, the regeneration valve core is threadedly inserted into the regeneration pipeline, and the regeneration pipeline adjusts the gas flow rate as the regeneration valve core rotates.

[0010] Preferably, the pneumatic combination valve includes an intake valve respectively connected to the two groups of drying towers through pipelines, and an exhaust valve connected in parallel with the intake valve through pipelines. There are two exhaust valves, namely exhaust valve one and exhaust valve two. Exhaust valve one is connected to one group of drying towers through pipelines, and exhaust valve two is connected to another group of drying towers through pipelines. A heating element and a temperature sensor are installed on the valve block, and the heating element and the temperature sensor are respectively connected to the electronic controller.

[0011] Preferably, the air outlet ends of the exhaust valve one and the exhaust valve two are both connected to a muffler with a noise reduction function through a pipeline, and the air outlet end of the muffler is connected to a ball valve.

[0012] Preferably, the solenoid valve group includes solenoid valve one connected to exhaust valve one and solenoid valve two connected to exhaust valve two, and solenoid valve one and solenoid valve two are respectively connected to the intake valve.

[0013] Preferably, the tower frame has an upper cover located above the two groups of drying towers, a pipeline is opened in the upper cover, and the two tower bodies in each group of drying towers are connected in series through the pipeline in the upper cover.

[0014] The control method of the heatless regeneration air drying system for locomotives described above is characterized by: S1: One set of drying towers is set to an adsorption state capable of drying wet air, and another set of drying towers is set to a regeneration state for exhaust gas containing water and oil impurities; S2: The electronic controller controls the solenoid valve group to be energized and sets the energization time. The solenoid valve group controls the pneumatic combination valve to open, so that the wet air enters the drying tower in the adsorption state through the pneumatic combination valve and is discharged into the exhaust pipe after being dried. Part of the air in the exhaust pipe is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower in the regeneration state, blows out the waste gas containing water and oil impurities in the drying tower in the regeneration state and is discharged through the pneumatic combination valve; S3: When the set power-on time is reached, the electronic controller controls the electromagnetic valve group to lose power and sets the power-off time. The exhaust gas discharge end of the pneumatic combination valve is closed, and the wet air continues to enter the drying tower in the adsorption state and is discharged into the exhaust pipe after being dried. Part of the air in the exhaust pipe is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower in the regeneration state through the exhaust pipe to inflate the drying tower; S4: When the power is turned off at the set time, the adsorption state and regeneration state of the two groups of drying towers are exchanged, and steps S2 to S4 are repeated to form two groups of drying towers that exchange periodically to dry and discharge the wet air and the waste gas containing water and oil impurities in the drying towers.

[0015] Preferably, when the temperature sensor detects that the valve block temperature is less than 5°C, the electronic controller controls the heating element to start heating the valve block; when the temperature sensor detects that the valve block temperature is greater than 45°C, the electronic controller controls the heating element to stop heating the valve block.

[0016] Preferably, the air flow rate from the regeneration pipeline into the drying tower in the regeneration state is adjusted by adjusting the screwing depth of the regeneration valve core in the regeneration pipeline.

[0017] The beneficial effects of the invention are: In the heatless regeneration air drying system for locomotives of the present invention, an exhaust pipeline is integrated in the lower cover, and the exhaust pipeline 4 connects the two groups of drying towers and is used for exhausting dry air, which simplifies the connection between the two groups of drying towers and the air outlet pipeline. A valve block is fixed at the bottom of the lower cover, and a pipeline is opened in the valve block and a pneumatic combination valve is integrated, which simplifies the installation structure of the pneumatic combination valve and the connecting pipeline of the pneumatic combination valve, so that the pipelines in the system are integrated in the lower cover and the valve block, simplifying the pipeline structure and reducing the space occupied by the pipeline; each group of drying towers is formed by two tower bodies connected in series, and the four tower bodies are rectangular Distribution, multiple tower bodies are installed together, which is convenient for installation, simpler pipeline connection, and low space occupancy. It can effectively shorten the pipeline length between the two groups of drying towers and between the drying tower and the pneumatic combination valve, shorten the pipeline path, improve the exhaust efficiency, increase the exhaust volume, and meet the requirements of large air volume and long air use time of the locomotive braking system, forming an air drying system with compact structure, high integration, small space occupancy rate and simple pipeline structure. It can be installed and disassembled as a whole, reducing the space requirements of the air drying system in installation and layout, and facilitating maintenance and repair.

[0018] The air flow rate of the regeneration pipeline is regulated by adjusting the screwing depth of the regeneration valve core on the regeneration pipeline, thereby adjusting the flow rate of dry air entering the drying tower in the regeneration state to adapt to different regeneration working conditions. The problem that the fixed value of the regeneration throttle hole size in the prior art is difficult to match various regeneration working conditions is solved, and it is ensured that the waste gas containing water and oil impurities in the drying tower in the regeneration state is effectively blown out by the dry air, thereby improving the regeneration reliability of the drying tower.

[0019] The temperature sensor is used to monitor the temperature of the valve block in real time, and the heating element is used to heat the valve block. The temperature sensor transmits the real-time temperature to the electronic controller, and the electronic controller controls the heating element to heat the valve block according to the temperature information, so as to avoid the slow movement or jamming of the pneumatic combination valve due to the low temperature of the valve block in extremely congested weather, thereby improving the control reliability and environmental adaptability of the entire system.

[0020] The control method of the heatless regeneration air drying system for locomotives realizes the periodic exchange of two groups of drying towers to dry and discharge wet air and exhaust gas containing water and oil impurities in the drying towers. The pneumatic combination valve is controlled by the power-on or power-off of the solenoid valve group of the electronic controller. The power-on and power-off time of the solenoid valve group are set in the electronic controller so that the state exchange time of the double towers can be adjusted according to the drying demand of the wet air to ensure the effect of drying and purifying the wet air. The state exchange time of the double towers is extended in a high humidity environment to ensure the effect of drying and purifying the wet air, reduce the corrosion of the locomotive brake system, avoid frequent reversal of the pneumatic combination valve, and extend its service life; the state exchange time of the double towers is shortened in a low humidity environment to avoid the loss of compressed air, improve the air supply reliability of the locomotive brake, and improve the environmental adaptability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the heatless regeneration air drying system for locomotives of the present invention.

[0022] Figure 2 Another schematic diagram of a heatless regenerative air drying system for locomotives.

[0023] Figure 3 This is the air circuit structure diagram of the heatless regeneration air drying system for locomotives.

[0024] Figure 4 Schematic diagram of the heating element installed on the valve block.

[0025] Figure 5 A schematic diagram of the tower. DETAILED DESCRIPTION

[0026] Combine the following Figures 1 to 5 The embodiments of the present invention are described in detail.

[0027] A heatless regeneration air drying system for locomotives comprises a tower frame 1, a lower cover 2 in the middle of the tower frame, two groups of drying towers 3 are mounted on the lower cover, and the system is characterized in that: an exhaust pipe 4 for connecting the two groups of drying towers 3 and used for exhausting dry air is integrated in the lower cover 2, a valve block 5 is fixed at the bottom of the lower cover 2, a pipeline is provided in the valve block 5 and a pneumatic combination valve 6 for controlling the entry of wet air into the drying tower and the exhaust gas containing water and oil impurities to be discharged from the drying tower is integrated, the pneumatic combination valve 6 is respectively connected to the two groups of drying towers 3 through the pipeline on the valve block 5, an electromagnetic valve group 7 for controlling the action of the pneumatic combination valve and an electric controller 8 for controlling the electromagnetic valve group 7 are installed on the tower frame 1, each group of drying towers 3 is formed by two tower bodies 31 connected in series, an adsorbent A and an oil-water separator B located below the adsorbent are installed in the tower body 31, and four tower bodies 31 are distributed in a rectangular shape on the lower cover 2.

[0028] In the above-mentioned heatless regeneration air drying system for locomotives, an exhaust pipe 4 is integrated in the lower cover 2, and the exhaust pipe 4 connects the two groups of drying towers 3 and is used for exhausting dry air, which simplifies the connection between the two groups of drying towers and the air outlet pipe. A valve block 5 is fixed at the bottom of the lower cover 2, and a pipe is opened in the valve block 5 and a pneumatic combination valve 6 is integrated, which simplifies the installation structure of the pneumatic combination valve 6 and the connecting pipe of the pneumatic combination valve 6, so that the pipes in the system are integrated in the lower cover 2 and the valve block 5, simplifying the pipe structure and reducing the space occupied by the pipes; each group of drying towers 3 is formed by two tower bodies 31 connected in series, and four The tower bodies 31 are distributed in a rectangular shape. Multiple tower bodies 31 are installed together, which is convenient to install, simpler to connect the pipelines, and has a low space occupancy rate. The length of the pipelines between the two groups of drying towers 3 and between the drying towers and the pneumatic combination valve 6 can be effectively shortened, the pipeline path can be shortened, the exhaust efficiency can be improved, and the exhaust volume can be increased to meet the requirements of the locomotive braking system for large air volume and long air use time, forming an air drying system with a compact structure, high integration, small space occupancy rate, and simple pipeline structure. The air drying system can be installed and disassembled as a whole, reducing the space requirements for the installation and layout of the air drying system, and facilitating maintenance and repair. The adsorbent A in the tower body 31 is used to absorb moisture in the air, and the oil-water separator B is used to remove larger water droplets, oil droplets and dust in the air.

[0029] Among them, the exhaust pipeline 4 includes a regeneration pipeline 41 connecting two groups of drying towers and an outlet pipeline 42 connected in parallel with the regeneration pipeline 41. The outlet pipeline 42 has an outlet end 421 that can be connected to the locomotive braking system. Two check valves 43 with opposite opening directions are installed on the outlet pipeline 42. One check valve 43 is connected to one group of drying towers 3 and opens with the exhaust of the drying towers 3. The other check valve 43 is connected to another group of drying towers 3 and opens with the exhaust of the other group of drying towers 3. A humidity display 11 with a detection end extending to the outlet end 421 of the outlet pipeline 42 is installed on the lower cover 2. After the pneumatic combination valve is opened, the wet air enters a group of drying towers 3, is dried in the drying towers, and then is discharged to the exhaust pipe 4. The outlet pipe 42 in the exhaust pipe 4 is used to discharge the dry air. The outlet end is connected to the braking system of the locomotive, and the dry air can be directly introduced into the braking system. The regeneration pipe 41 is used to introduce the dry air into another group of drying towers 3 to blow out the exhaust gas containing water and oil impurities and discharge it through the pneumatic combination valve 6, forming a group of drying towers 3 that adsorbs and dries the wet air in an adsorption state, and the exhaust gas containing water and oil impurities blown out from the other group of drying towers 3 is in a regeneration state. The two groups of drying towers 3 periodically exchange the adsorption and regeneration states, so that the two groups of drying towers can be formed to perform periodic exchange to dry and discharge the wet air and the exhaust gas containing water and oil impurities in the drying towers, thereby ensuring the uninterrupted supply of dry air to the braking system of the locomotive.

[0030] The regeneration pipeline 41 is provided with a regeneration valve core 44 for adjusting the gas flow rate. The regeneration valve core 44 is threadedly inserted into the regeneration pipeline 41. The regeneration pipeline 41 adjusts the gas flow rate as the regeneration valve core 44 rotates. The gas flow rate of the regeneration pipeline 41 is adjusted by adjusting the screwing depth of the regeneration valve core 44 on the regeneration pipeline 41, thereby adjusting the dry air flow rate entering the drying tower in the regeneration state to meet different regeneration working conditions. This solves the problem in the prior art that the fixed value of the regeneration throttle hole size is difficult to match various regeneration working conditions, ensures that the waste gas containing water and oil impurities in the drying tower 3 in the regeneration state is effectively blown out by the dry air, and improves the regeneration reliability of the drying tower.

[0031] Among them, the pneumatic combination valve 6 includes an intake valve 61 respectively connected to the two groups of drying towers 3 through pipelines, and an exhaust valve connected in parallel with the intake valve 61 through pipelines. The number of exhaust valves is two, namely exhaust valve one 62 and exhaust valve two 63. Exhaust valve one 62 is connected to one group of drying towers 3 through pipelines, and exhaust valve two 63 is connected to another group of drying towers 3 through pipelines. A heating element 51 and a temperature sensor are installed on the valve block 5, and the heating element 5 and the temperature sensor are respectively connected to the electronic controller 8. The temperature sensor is used to monitor the temperature of the valve block 5 in real time, and the heating element 51 is used to heat the valve block. The temperature sensor transmits the real-time temperature to the electronic controller, and the electronic controller controls the heating element 51 to heat the valve block according to the temperature information, so as to avoid the slow movement or jamming of the pneumatic combination valve due to the low temperature of the valve block in extremely congested weather, thereby improving the control reliability and environmental adaptability of the entire system; the intake valve 61 is used to control the entry of wet air into the drying tower 3, and the exhaust valve is used to control the exhaust gas containing water and oil impurities from being discharged from the drying tower. The intake valve 61 is a reversing pneumatic valve that is connected to one group of drying towers or another group of drying towers through reversing, so that the wet air that needs to be dried can enter the drying tower. When the intake valve 61 is opened and connected to one group of drying towers 3, the exhaust valve connected to the other group of drying towers 3 is opened, forming an adsorption state of one group of drying towers 3 for adsorbing and drying wet air, and a regeneration state of the other group of drying towers 3 for blowing out the exhaust gas containing water and oil impurities.

[0032] The outlet ends of the exhaust valve 1 62 and the exhaust valve 2 63 are both connected to the muffler 9 with noise reduction function through pipelines, and the outlet end of the muffler 9 is connected to the ball valve 10. The muffler 9 is used to buffer and throttle the exhaust gas to achieve noise reduction. The ball valve 10 is closed when the drying system fails to exhaust air to meet the wind pressure requirements of the locomotive braking system.

[0033] The solenoid valve group 7 includes a solenoid valve 1 71 connected to the exhaust valve 1 62 and a solenoid valve 2 72 connected to the exhaust valve 2 63. The solenoid valve 1 71 and the solenoid valve 2 72 are respectively connected to the intake valve 61. The solenoid valve 1 71 controls the opening and closing of the exhaust valve 1 62, and the solenoid valve 2 72 controls the opening and closing of the exhaust valve 2 63. At the same time, the solenoid valve 1 71 and the solenoid valve 2 72 work together to control the switching of the intake valve 61. Figure 3 As shown, exhaust valve one 62 is connected to one group of drying towers 3, exhaust valve two 63 is connected to another group of drying towers 3, and intake valve 61 is connected to the two drying towers respectively. When exhaust valve one 62 is opened to connect to one group of drying towers and exhaust valve two 63 is disconnected to cut off the other group of drying towers, intake valve 61 is switched to connect to the other group of drying towers, so that one group of drying towers can enter wet air for adsorption drying, and the other group of drying towers can discharge exhaust gas with water and oil impurities for regeneration.

[0034] The tower frame 1 has an upper cover 12 located above the two groups of drying towers 3, and a pipeline is provided in the upper cover 12, and the two tower bodies 31 in each group of drying towers are connected in series through the pipeline in the upper cover 12. The tower bodies in the two groups of drying towers 3 are connected in series through the pipeline in the upper cover 12, which simplifies the pipeline structure, reduces the space occupied by the pipeline, is convenient for installation, has simpler pipeline connection, and has a low space occupancy rate, and can effectively shorten the series pipeline path of the two tower bodies in the two groups of drying towers 3, further improve the structural compactness and integration of the drying system, reduce its space occupancy rate, and improve the exhaust efficiency.

[0035] The present invention also protects the control method of the heatless regeneration air drying system for locomotives as described above, which is characterized by: S1: One group of drying towers 3 is set to an adsorption state capable of drying wet air, and another group of drying towers 3 is set to a regeneration state for exhausting waste gas containing water and oil impurities; S2: The electronic controller controls the electromagnetic valve group 7 to be energized and sets the energization time. The electromagnetic valve group 7 controls the pneumatic combination valve 6 to open, so that the wet air enters the drying tower 3 in the adsorption state through the pneumatic combination valve 6 and is discharged to the exhaust pipe 4 after being dried. A part of the air in the exhaust pipe 4 is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower 3 in the regeneration state, and the exhaust gas containing water and oil impurities in the drying tower in the regeneration state is blown out and discharged through the pneumatic combination valve 6; S3: When the set power-on time is reached, the electronic controller 8 controls the electromagnetic valve group 7 to lose power and sets the power-off time. The exhaust gas discharge end of the pneumatic combination valve 6 is closed, and the wet air continues to enter the drying tower in the adsorption state and is discharged into the exhaust pipe 4 after being dried. A part of the air in the exhaust pipe is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower in the regeneration state through the exhaust pipe to inflate the drying tower 3; S4: When the power is turned off at the set time, the adsorption state and regeneration state set in the two groups of drying towers 3 are exchanged, and steps S2 to S4 are repeated, so that the two groups of drying towers 3 are exchanged periodically to dry and discharge the wet air and the waste gas containing water and oil impurities in the drying towers.

[0036] The control method of the heatless regeneration air drying system for locomotives described above realizes the periodic exchange of two groups of drying towers to dry and discharge wet air and exhaust gas containing water and oil impurities in the drying towers. The pneumatic combination valve is controlled by the power-on or power-off of the solenoid valve group 7 of the electronic controller 8. The power-on and power-off time of the solenoid valve group 7 are set in the electronic controller 8 so that the state exchange time of the double towers can be adjusted according to the drying demand of the wet air to ensure the effect of drying and purifying the wet air. The state exchange time of the double towers is extended in a high humidity environment to ensure the drying and purifying effect of the wet air, reduce corrosion to the locomotive braking system, avoid frequent reversing of the pneumatic combination valve, and extend its service life; the state exchange time of the double towers is shortened in a low humidity environment to avoid the loss of compressed air, improve the air supply reliability to the locomotive brake, and improve the environmental adaptability of the system.

[0037] When the temperature of the valve block detected by the temperature sensor is less than 5°C, the electric controller controls the heating element 51 to start heating the valve block. When the temperature sensor detects that the temperature of the valve block is greater than 45°C, the electric controller 8 controls the heating element 51 to stop heating the valve block. The electric controller 8 controls the heating element 51 to heat the valve block according to the temperature information, so as to avoid the slow movement or stagnation of the pneumatic combination valve due to the low temperature of the valve block in extremely congested weather, thereby improving the control reliability and environmental adaptability of the entire system.

[0038] The air flow rate of the drying tower 3 in the regeneration state from the regeneration pipeline 41 is adjusted by adjusting the screwing depth of the regeneration valve core 44 in the regeneration pipeline 41. The air flow rate of the regeneration pipeline 41 is adjusted by adjusting the screwing depth of the regeneration valve core 44 on the regeneration pipeline 41, thereby adjusting the flow rate of dry air entering the drying tower in the regeneration state, adapting to different regeneration working conditions, solving the problem that the fixed value of the regeneration throttle hole size in the prior art is difficult to match various regeneration working conditions, ensuring that the waste gas containing water and oil impurities in the drying tower 3 in the regeneration state is effectively blown out by the dry air, and improving the regeneration reliability of the drying tower.

[0039] The control method of the heatless regeneration air drying system for locomotives described above is described in detail below in combination with the specific structure of the heatless regeneration air drying system for locomotives: like Figure 3 As shown, the two tower bodies in one group of drying towers 3 are set to be tower body I and tower body II, and the two tower bodies in another group of drying towers 3 are tower body III and tower body IV. The exhaust valve 1 62 is connected to the drying tower group consisting of tower body I and tower body II, and the exhaust valve 2 63 is connected to the other group of drying towers. When the electronic controller 8 controls the electromagnetic valve 1 71 to lose power and the electromagnetic valve 2 72 to be powered, the intake valve 61 is switched to the left to open and connect with the tower body I and the tower body II, and the exhaust valve 2 63 is opened. At this time, the tower body I and the tower body II are set to the adsorption state, and the tower body III and the tower body IV are set to the regeneration state. Saturated wet air enters the intake valve 61 from the air compressor, enters the tower body II and the tower body I through the intake valve core 61, and absorbs the moisture in the air through the adsorbent in the tower body. The oil-water separator removes larger water droplets, oil droplets and dust. After drying, a part of the dry air opens the check valve 43 in the outlet pipeline 42 connected with the tower body I by pressure and is delivered to the brake system through the outlet end 421. Another part of the dry air flows to the tower body III and the tower body IV through the regeneration pipeline 41, blows out the waste gas containing water and oil impurities in the tower body and discharges it through the exhaust valve 2 63, the muffler 9 and the ball valve 10. When the set power-on time of the solenoid valve 2 72 is reached, the electronic controller controls the solenoid valve 2 72 to lose power. At this time, the solenoid valve 1 71 and the solenoid valve 2 72 are both in the power-off state, and the exhaust valve 1 62 and the exhaust valve 2 63 are both in the closed state; therefore, the tower bodies Ⅰ and Ⅱ continue to dry the wet air, while the tower bodies Ⅲ and Ⅳ stop blowing out the exhaust gas containing water and oil impurities. A part of the dry air discharged from the tower bodies Ⅰ and Ⅱ continues to be delivered to the brake system through the outlet end 421, and the other part is delivered to the brake system through the regeneration pipeline 4 1 intermittently fills tower body III and tower body IV, so that the inflation pressure of tower body III and tower body IV gradually increases. When the set power-off time of electromagnetic valve 2 is reached, the electric controller controls electromagnetic valve 1 71 to be energized, and the state of tower body I, tower body II and tower body III, tower body IV is switched. Tower body I and tower body II are switched to regeneration state, while tower body III and tower body IV are switched to adsorption state, and the above process is repeated to form two groups of drying towers 3, which are exchanged periodically to dry and discharge wet air and exhaust gas containing water and oil impurities in the drying tower. The drying tower can cyclically dry and regenerate to meet the needs of large air volume and long air use time.

[0040] The above is a complete description of the technical solutions of the embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

Claims

1. A heatless regeneration air drying system for locomotives, comprising a tower frame, a lower cover in the middle of the tower frame, and two sets of drying towers mounted on the lower cover, characterized in that: The lower cover is integrated with an exhaust pipeline connecting the two groups of drying towers and used for discharging dry air. A valve block is fixed at the bottom of the lower cover. A pipeline is opened in the valve block and a pneumatic combination valve is integrated to control the entry of wet air into the drying tower and the discharge of waste gas containing water and oil impurities from the drying tower. The pneumatic combination valve is respectively connected to the two groups of drying towers through the pipeline on the valve block. An electromagnetic valve group for controlling the action of the pneumatic combination valve and an electric controller for controlling the electromagnetic valve group are installed on the tower frame. Each group of drying towers is formed by two tower bodies connected in series. An adsorbent and an oil-water separator located below the adsorbent are installed in the tower body. The four tower bodies are distributed in a rectangular shape on the lower cover.

2. The heatless regeneration air drying system for locomotive according to claim 1, characterized in that: The exhaust pipeline includes a regeneration pipeline connecting two groups of drying towers and an outlet pipeline connected in parallel with the regeneration pipeline. The outlet pipeline has an outlet end that can be connected to the locomotive braking system. Two check valves with opposite opening directions are installed on the outlet pipeline. One check valve is connected to one group of drying towers and opens with the exhaust of the drying towers. The other check valve is connected to the other group of drying towers and opens with the exhaust of the other group of drying towers. A humidity display with a detection end extending to the outlet end of the outlet pipeline is installed on the lower cover.

3. The heatless regeneration air drying system for locomotive according to claim 2, characterized in that: The regeneration pipeline is provided with a regeneration valve core for adjusting the gas flow rate. The regeneration valve core is threadedly inserted into the regeneration pipeline. The regeneration pipeline adjusts the gas flow rate as the regeneration valve core rotates.

4. The heatless regeneration air drying system for locomotive according to claim 1, characterized in that: The pneumatic combination valve comprises an intake valve respectively connected to two groups of drying towers through pipelines, and an exhaust valve connected in parallel with the intake valve through pipelines. There are two exhaust valves, namely exhaust valve one and exhaust valve two. Exhaust valve one is connected to one group of drying towers through pipelines, and exhaust valve two is connected to another group of drying towers through pipelines. A heating element and a temperature sensor are installed on the valve block, and the heating element and the temperature sensor are respectively connected to the electronic controller.

5. The heatless regeneration air drying system for locomotive according to claim 4, characterized in that: The air outlet ends of the exhaust valve 1 and the exhaust valve 2 are both connected to a muffler with a noise reduction function through a pipeline, and the air outlet end of the muffler is connected to a ball valve.

6. The heatless regeneration air drying system for locomotive according to claim 4, characterized in that: The solenoid valve group comprises a solenoid valve 1 connected to an exhaust valve 1 and a solenoid valve 2 connected to an exhaust valve 2, and the solenoid valve 1 and the solenoid valve 2 are connected to the intake valve respectively.

7. The heatless regeneration air drying system for locomotive according to claim 1, characterized in that: The tower frame is provided with an upper cover located above the two groups of drying towers, a pipeline is provided in the upper cover, and the two tower bodies in each group of drying towers are connected in series through the pipeline in the upper cover.

8. The control method of the heatless regeneration air drying system for locomotive according to any one of claims 1 to 7, characterized in that: S1: One set of drying towers is set to an adsorption state capable of drying wet air, and another set of drying towers is set to a regeneration state for exhaust gas containing water and oil impurities; S2: The electronic controller controls the solenoid valve group to be energized and sets the energization time. The solenoid valve group controls the pneumatic combination valve to open, so that the wet air enters the drying tower in the adsorption state through the pneumatic combination valve and is discharged into the exhaust pipe after being dried. Part of the air in the exhaust pipe is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower in the regeneration state, blows out the waste gas containing water and oil impurities in the drying tower in the regeneration state and is discharged through the pneumatic combination valve; S3: When the set power-on time is reached, the electronic controller controls the electromagnetic valve group to lose power and sets the power-off time. The exhaust gas discharge end of the pneumatic combination valve is closed, and the wet air continues to enter the drying tower in the adsorption state and is discharged into the exhaust pipe after being dried. Part of the air in the exhaust pipe is discharged and enters the braking system of the locomotive, and the other part of the air enters the drying tower in the regeneration state through the exhaust pipe to inflate the drying tower; S4: When the power is turned off at the set time, the adsorption state and regeneration state of the two groups of drying towers are exchanged, and steps S2 to S4 are repeated to form two groups of drying towers that exchange periodically to dry and discharge the wet air and the waste gas containing water and oil impurities in the drying towers.

9. The control method of the heatless regeneration air drying system for locomotive according to claim 8, characterized in that: When the temperature sensor detects that the valve block temperature is less than 5°C, the electronic controller controls the heating element to start heating the valve block. When the temperature sensor detects that the valve block temperature is greater than 45°C, the electronic controller controls the heating element to stop heating the valve block.

10. The control method of the heatless regeneration air drying system for locomotive according to claim 8, characterized in that: By adjusting the screwing depth of the regeneration valve core in the regeneration pipeline, the air flow rate from the regeneration pipeline into the drying tower in the regeneration state is adjusted.

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