Oxygen generation system for plateau passenger train

Abstract

The utility model relates to an oxygen generation system for a plateau passenger train. The oxygen generation system comprises an air compressor, a three-stage filter system, a membrane oxygen generator, a control module and an oxygen supply pipeline system, the air compressor is used for compressing outside air; the three-stage filter system is used for removing solid impurities and liquid water in the compressed air; the membrane oxygen generator is used for separating nitrogen and oxygen in the filtered air and outputting oxygen-enriched air; the control module is used for controlling the oxygen generation system to operate; the oxygen supply pipeline system supplies oxygen-enriched air in two ways, one way enters an air conditioner main air duct to be mixed with fresh air and then is dispersed into a passenger room, and the other way is supplied to oxygen-enriched air outlets in all compartments or seats in a compartment. A pre-membrane heater is arranged behind the third-stage filter system and is used for heating air entering the membrane oxygen generator; and the oxygen generation system comprises a fresh air adjusting device linked with the air conditioning system. According to the utility model, the problems of low oxygen generation efficiency and poor system stability of the plateau railway carriage are solved, and the comfort and safety of passengers are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transportation, and in particular relates to an oxygen production system for a plateau railway passenger car. Background Art

[0002] In modern plateau railway transportation systems, oxygen supply inside carriages is one of the key technologies to ensure passenger comfort and health. As one of the highest-altitude railways in the world, the Qinghai-Tibet Railway has particularly strict requirements for oxygen supply inside carriages. At present, the railway passenger car oxygen generator technology has been applied to the 25T passenger cars of the Qinghai-Tibet Railway and the plateau dual-source EMU cars of the Lhasa-Nyingchi Railway, demonstrating the importance and practical value of this technology. However, although the existing oxygen production technology has been applied in practice, there are still some obvious limitations and shortcomings.

[0003] It can be seen from the recently disclosed patent documents that the current oxygen production technology is mainly focused on the structural setting of the oxygen production equipment and the description of the oxygen production effect. For example, CRRC Zhuzhou Electric Locomotive Co., Ltd. introduced the oxygen production device and control method of the power-centralized EMU in its patent document [CN202310002107.9], focusing on the overall structure of the oxygen generator in the locomotive driver's cab and the oxygen pipeline structure in the driver's cab, but did not describe the oxygen generator host and its control method in detail. In another patent [CN202211121514.3], an oxygen production control method based on the relationship between the oxygen concentration in the passenger compartment, the number of passengers and the amount of compressed air is introduced, but the structural setting and control details of the oxygen generator are not discussed in depth. In addition, the patent [CN202222757210.8] of Zhonggui Fuyang (Beijing) Technology Co., Ltd. proposes an overall structural setting of a membrane oxygen-enriched oxygen production system, but also does not involve a specific system control method.

[0004] The limitations of these existing technologies are mainly reflected in the following aspects: First, the existing technologies lack a comprehensive description of the oxygen generator and its control method, which limits the further improvement of oxygen production efficiency. Secondly, although some patent documents mention the oxygen production control method, the description of the structural settings and specific control details of the oxygen generator is not detailed enough, which may affect the stability and reliability of the oxygen production system. Finally, most of the existing oxygen production system settings do not take into account the special requirements of EMUs in extreme plateau environments, such as oxygen production efficiency and system stability under low pressure and low temperature conditions.

[0005] In summary, although the current oxygen production technology has been applied in high-altitude railway passenger cars, there is still room for improvement, especially in the setting of the oxygen production host, the optimization of the control method, and the adaptability of the oxygen production system in extreme environments. The solution to these problems will have an important impact on improving the riding comfort and safety of high-altitude railway EMUs. Utility Model Content

[0006] Aiming at the shortcomings in the related technologies, the utility model provides an oxygen production system for a high-altitude railway passenger car, which solves the problem that the existing railway oxygen production system does not take into account the special requirements in the extreme environment of the plateau, such as the oxygen production efficiency and system stability under low pressure and low temperature conditions.

[0007] According to one aspect of the present application, there is provided an oxygen production system for a plateau railway passenger car, comprising an air compressor, a three-stage filter system, a membrane oxygen generator and an oxygen supply pipeline system connected in sequence, and also comprising a control module; wherein the air compressor is used to compress external air and provide pressurized air; the three-stage filter system is used to remove impurities and liquid water in the compressed air; the membrane oxygen generator is used to separate nitrogen and oxygen in the filtered air and output oxygen-enriched air; the control module comprises local control and network centralized control modes for controlling the operation of the oxygen production system; the oxygen supply pipeline system supplies oxygen-enriched air in two ways, one way enters the main air duct of the air conditioner and is mixed with fresh air and then diffused into the passenger compartment, and the other way is supplied to the oxygen-enriched air outlets of each compartment or seat in the carriage; a pre-membrane heater is provided between the three-stage filter system and the membrane oxygen generator for heating the air entering the membrane oxygen generator from the three-stage filter system; and also comprises a fresh air regulating device linked to the air conditioning system, when the oxygen generator is running, the fresh air regulating device is configured to be controlled by the control module to adjust the fresh air volume.

[0008] In a possible implementation, the oxygen supply pipeline system includes a safety control module for automatically adjusting the oxygen supply according to the oxygen concentration in the vehicle compartment.

[0009] In a possible embodiment, it also includes an ambient temperature detection module, which is configured to detect the external ambient temperature. When the external ambient temperature is lower than a set threshold, the heating device is automatically started to preheat the air compressor and the air storage tank connected between the three-stage filter system and the air compressor.

[0010] In a possible implementation, the system further includes a remote monitoring module, through which an operator at a control center remotely monitors the system operating status, adjusts control parameters, and remotely starts or stops equipment.

[0011] In a possible implementation, the control module is configured to use an adaptive PID control algorithm to automatically adjust the temperature of the pre-membrane heater.

[0012] In a possible implementation, the number of air compressors is set to two, one of which is used as a backup, and the backup air compressor is started when the other air compressor fails.

[0013] In a possible implementation, each compartment of the oxygen supply pipeline system is provided with a connection interface at the first and second ends, and the oxygen-enriched air is connected between the compartments through a quick-connect hose.

[0014] Based on the above technical scheme, the utility model of the plateau railway passenger car oxygen production system solves the problem of thin air and insufficient oxygen for passengers in plateau areas through the sequentially connected air compressor, three-stage filter system, membrane oxygen generator and oxygen supply pipeline system; the air compressor compresses the outside air, the three-stage filter system removes impurities and liquid water, the membrane oxygen generator separates nitrogen and oxygen in the air, the control module controls the operation of the oxygen production system, and the oxygen supply pipeline system supplies oxygen-rich air to various positions in the coach, ensuring that passengers can obtain sufficient oxygen supply in the plateau environment, thereby improving the riding comfort and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 This is a schematic structural diagram of an oxygen production system for a plateau railway passenger car according to one embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of electrical connections of an air compressor control circuit according to one embodiment of the present application;

[0018] Figure 3 This is a schematic diagram of electrical connections of an air compressor case heating and lubrication heating control circuit according to one embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of electrical connections of a gas tank drainage heating and filling and drainage valve control circuit according to one embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of electrical connections of a three-stage filtration system control circuit according to one embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of electrical connections of a membrane front heater control circuit according to one embodiment of the present application;

[0022] Figure 7 This is a schematic diagram of the connection of the pressure and temperature analog quantity acquisition circuit of the membrane oxygen generator and the air compressor in one embodiment of the present application;

[0023] Figure 8 This is a PID control logic of a membrane front heater according to an embodiment of the present application.

[0024] In the figure:

[0025] 1. Air compressor; 2. Air storage tank; 3. Three-stage filter system; 4. Pre-membrane heater; 5. Membrane oxygen generator; 6. Oxygen outlet. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0027] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In order to solve the problem that the existing railway oxygen production system does not take into account the special requirements in the extreme environment of the plateau, such as oxygen production efficiency and system stability under low pressure and low temperature conditions.

[0031] In one aspect of the present application, an oxygen production system for a plateau railway passenger car is provided. Figure 1In a possible implementation, the oxygen concentrator control system of the plateau railway passenger car includes an air compressor 1, a three-stage filter system 3, a membrane oxygen concentrator 5, a control module, and an oxygen supply pipeline system. Among them, the air compressor 1 is used to compress the outside air and provide pressurized air; the three-stage filter system 3 is used to remove solid impurities such as oil and dust and liquid water in the compressed air; the membrane oxygen concentrator 5 is used to separate the nitrogen and oxygen in the filtered air, and output oxygen-enriched air with an oxygen content of 35%-45%; the control module includes local control and network centralized control methods, which are used to control the operation of the oxygen production system; the oxygen supply pipeline system supplies oxygen-enriched air in two ways, one way enters the main air duct of the air conditioner and mixes with the fresh air and then diffuses into the passenger compartment, and the other way supplies the oxygen outlet 6 of each compartment or seat in the carriage; a pre-membrane heater 4 is provided after the three-stage filter system 3 to heat the air entering the membrane oxygen concentrator 5.

[0032] In the above scheme, the air compressor 1, as the front-end equipment of the oxygen production system, compresses the outside air and provides the necessary pressure to ensure the continuous supply of air in the subsequent process. The three-stage filter system 3 effectively removes impurities and moisture in the compressed air through multi-stage filtration, providing clean and dry air for the membrane oxygen production process, which is a key step to ensure oxygen purity and separation efficiency.

[0033] The separation technology used by the membrane oxygen generator 5 can efficiently separate nitrogen and oxygen from the air. By adjusting the equipment parameters, it can stably output oxygen-enriched air with an oxygen content of 35%-45%, meeting the oxygen demand in the plateau railway passenger car. The setting of the control module takes into account both the autonomy of the system and the need for remote centralized control, making the system operation more intelligent and flexible. The setting of the oxygen supply pipeline system takes into account the actual use needs in the passenger car. Through reasonable pipeline distribution and oxygen outlet 6 settings, it ensures that the oxygen-enriched air can be efficiently and evenly distributed to various areas in the passenger compartment.

[0034] The setting of the pre-membrane heater 4 further optimizes the temperature condition of the air entering the membrane oxygen generator 5, and improves the oxygen separation efficiency and the overall performance of the system. The membrane oxygen production process is a physical process, without any chemical reaction, without any additives, without pollution waste, and environmentally friendly oxygen production. The outside air is compressed by the air compressor 1, and after reaching a certain pressure, it is removed by the three-stage filter system 3 to remove solid impurities such as oil and dust and most of the liquid water. After preheating, it enters the membrane oxygen generator 5 to separate oxygen-enriched air with an oxygen content of 35%-45%. The oxygen-enriched air enters the first transition main air duct of the air conditioner, where the oxygen-enriched air is mixed with the fresh air of the air conditioner and diffused into the passenger compartment, which is called diffuse oxygen supply; the other way enters the oxygen outlet 6 quick socket at each compartment or seat along the side wall of the carriage to supply oxygen to passengers, which is called individual distributed oxygen supply.

[0035] The air supply pipeline is equipped with connection interfaces at the first and second ends of the vehicle. Compressed air is connected between the compartments through two quick-connect hoses, and the air source can be stored and supplemented between adjacent compartments. The oxygen production system has the characteristics of simple structure, small size, convenient and quick start / stop, etc. At the same time, it adopts membrane separation technology, outputs oxygen-rich air, low pressure, combines diffusion and individual distribution oxygen supply, and automatically coordinates with the air conditioner to maximize the comfort of passengers.

[0036] The control system adopts local control and network centralized control, which can communicate instantly and is supplemented by an automatic alarm system to make it safe and reliable. In a possible implementation, the air compressor 1 of the oxygen generator control system includes two air compressors, one of which is used as a backup, and the backup air compressor is started when the other air compressor fails.

[0037] In the above scheme, the configuration of two air compressors increases the reliability and stability of the system. If a failure occurs during the operation of the main air compressor, the standby air compressor can be started immediately to ensure the continuous operation of the oxygen production system and reduce possible downtime. This setting idea reflects the in-depth understanding of the operating environment of plateau railway passenger cars and the high attention paid to the safety and comfort needs of passengers.

[0038] like Figure 2 As shown in the figure, there are two air compressors, one of which is working while the other is in standby mode. The main circuit of the air compressor is powered by AC380V. The current transformer JK1 detects the three-phase current of the first air compressor and transmits it to the PLC. The air compressor cooling fan is equipped with a thermal protection relay to protect the fan from excessive current; the loading solenoid valve is powered by AC380V. The main circuit of the first air compressor is equipped with a phase sequence protection relay to detect overvoltage, undervoltage, and phase loss in the main circuit.

[0039] In a possible implementation, the first and second ends of each compartment of the oxygen supply pipeline system of the oxygen generator control system are provided with connection interfaces, and the compressed air is mutually connected between the compartments through the quick connection hose. In the above scheme, by providing the quick connection hose and the connection interface, the interconnection of the compressed air between the compartments is realized, which not only improves the flexibility and scalability of the system, but also ensures that when a compartment fails, the oxygen supply of other compartments is not affected, thereby enhancing the stability and reliability of the entire oxygen production system.

[0040] In a possible implementation, the control module of the oxygen generator control system adopts Omron PLC, which is equipped with an adaptive PID control algorithm for automatically adjusting the temperature of the pre-membrane heater 4. In the above scheme, Omron PLC is selected as the control core, not only because of its high reliability and powerful processing power, but also because it supports the adaptive PID control algorithm, which can automatically adjust the temperature of the pre-membrane heater 4 according to the actual operation conditions and optimize the oxygen production process. This intelligent temperature control strategy can automatically adjust the heater output according to environmental changes and system load, ensuring that the membrane oxygen production process is carried out under the optimal temperature conditions, thereby improving the efficiency and stability of the system.

[0041] Considering the low temperature in the plateau, when the ambient temperature is lower than the solidification point of the lubricating oil, the lubricating oil is in a solidified state, which will cause the air compressor to fail to start. At the same time, the viscosity of the lubricating oil will increase in low temperature weather, which will also affect the start-up of the air compressor and reduce the service life of the equipment. Therefore, the air compressor is equipped with a box heating and lubrication heating device. The heating device is powered by AC220V and controlled by contactors 7KM13 and 7KM14 respectively. See Figure 3 .

[0042] See also Figure 4 Before the compressed air enters the membrane system, it first enters the air buffer tank through the pipeline. It can initially remove the condensed water in the compressed air, which actually reduces the load on the filters, prolongs their life and provides an important safety method to prevent liquid from entering the membrane system. Another function of the air buffer tank is to provide pressure buffering to reduce the pressure fluctuations of the system. The pressure fluctuations at the inlet of the equipment will affect the flow rate and oxygen purity in the product gas.

[0043] The tank drainage is controlled by a solenoid valve. Considering the problem of water freezing in the tank under low temperature conditions, gas tank 2 is equipped with drainage heating. Both are powered by AC220V and controlled by contactor 7KM5 and relay 6KA5.

[0044] See also Figure 5 The oxygen-enriched membrane system is located in the vehicle control cabinet, and includes a three-stage filter system 3, a pre-membrane heater 4, a membrane separation component, namely a membrane oxygen generator 5 and pipelines.

[0045] The first filter in the three-stage filter system is a condensate removal filter, which can remove particulate oil and water in the compressed air. The second filter (1 micron) reduces particulate impurities and condensate in the gas to "trace amounts". The third filter is a fine filter (0.01 micron), which is designed to remove even the smallest dust to further protect the hollow fiber membrane.

[0046] The filter solenoid valve is powered by DC24V, and the solenoid valve is controlled by a PLC control relay. A pre-membrane heater 4 is set after the filter, as shown in the figure below. The heater is controlled by a circuit breaker and a solid-state relay. At the same time, to prevent the temperature from being too high, hardware protection TS01 and TS02 are installed. The heater temperature protection switch TS102 is set to 120±5℃ and installed on the outer surface of the heater. When the outer surface temperature of the heater exceeds 120℃, the temperature switch TS102 will operate. The membrane system temperature protection switch TS101 is set to 60±3℃ and installed in front of the membrane pipeline. When the temperature of the gas entering the membrane pipeline exceeds 60℃, the temperature switch TS101 will operate.

[0047] See also Figure 6 , an air inlet valve is set on the front pipeline of the membrane.

[0048] See also Figure 7 , the analog quantity is divided into pressure acquisition and temperature acquisition. The pressure acquisition includes the membrane inlet pressure, the exhaust pressure of the first air compressor, and the exhaust pressure of the second air compressor, which are placed in the pipeline before the membrane, the exhaust pipeline of the first air compressor, and the exhaust pipeline of the second air compressor respectively. The temperature acquisition includes the membrane inlet temperature, the temperature before the membrane, the box temperature of the first air compressor and the second air compressor, the exhaust temperature of the first air compressor and the second air compressor, the lubrication temperature of the first air compressor and the second air compressor, and the tank drainage temperature.

[0049] The output of the pressure sensor is 4-20mA, which is converted into 0-10V by a DC transmitter and sent to the PLC for processing. The temperature sensor is a PT100 type, which outputs 0-10V through a temperature transmitter and is sent to the PLC for processing.

[0050] In a possible implementation, the oxygen supply pipeline system of the oxygen generator control system includes a safety control module that automatically adjusts the oxygen supply according to the oxygen concentration in the vehicle compartment.

[0051] In the above scheme, the setting of the safety control module ensures that the oxygen production system can intelligently adjust the oxygen supply according to the actual oxygen concentration demand inside the bus. This dynamic adjustment mechanism based on real-time monitoring data can not only ensure the stability of the oxygen concentration in the car, but also avoid excessive oxygen supply, thus improving the economy and safety of the system.

[0052] In a possible implementation, the oxygen concentrator control system further includes a fresh air regulating device linked to the air conditioning system, which automatically adjusts the fresh air volume when the oxygen concentrator is running.

[0053] In the above scheme, the linkage setting of the oxygen concentrator and the air-conditioning system can not only optimize the oxygen concentration and air quality in the car according to the operating status of the oxygen concentrator through intelligent adjustment of the fresh air volume, but also flexibly adjust the fresh air volume according to external environmental conditions and internal needs of the car, ensuring the optimal balance between passenger comfort and air quality.

[0054] In a possible implementation, the oxygen concentrator control system further includes an ambient temperature detection module for detecting the external ambient temperature. When the ambient temperature is lower than a set threshold, the heating device is automatically started to preheat the air compressor and the gas storage tank 2.

[0055] In the above scheme, the setting of the ambient temperature detection module enables the system to automatically adjust the working state of the heating device according to the change of the external ambient temperature to preheat the air compressor and the gas storage tank 2. This automatic temperature adjustment mechanism ensures that the oxygen production system can operate stably even in a low temperature environment, and improves the adaptability and reliability of the system.

[0056] In a possible implementation, the oxygen concentrator control system also includes remote monitoring and control functions, and operators remotely monitor the system operating status at the control center, adjust control parameters, and remotely start and stop the equipment.

[0057] In the above scheme, the introduction of remote monitoring and control functions provides great convenience for system maintenance and management. Operators can monitor the operating status of the oxygen production system in real time at the control center, adjust control parameters as needed, and even start and stop equipment remotely, which not only improves operation and maintenance efficiency, but also enhances the safety and reliability of the system.

[0058] In a possible implementation, the oxygen concentrator control system further includes an automatic fault detection and diagnosis module. When any abnormality or fault is found during system operation, the module automatically diagnoses the problem and sends an alarm to the operator, while recording the fault information.

[0059] In the above scheme, the setting of automatic fault detection and diagnosis module provides the system with powerful self-diagnosis capability. When an abnormality or fault is found, the module can not only automatically diagnose the fault, but also send an alarm to the operator in time and record the relevant fault information, which is crucial for quickly locating the problem and taking maintenance measures in time, significantly improving the reliability and maintenance efficiency of the system.

[0060] On the other hand, the present application provides a control method for an oxygen generator in a plateau railway passenger car, comprising the following steps: starting an air compressor 1 to compress external air, and removing impurities through a three-stage filter system 3; heating the filtered air and sending it to a membrane oxygen generator 5 for oxygen-nitrogen separation to obtain oxygen-enriched air; a control module controls the oxygen supply pipeline system according to the demand for oxygen-enriched air, and supplies the oxygen-enriched air to the passenger compartment in two ways; monitoring the working status of each key component of the oxygen production system in real time, and adjusting the system working parameters through local control and network centralized control.

[0061] In the above scheme, the implementation steps of the oxygen generator control method reflect the scientificity and rationality of the system setting. First, the outside air is compressed by the air compressor 1, and the impurities in the air are removed by the three-stage filter system 3, ensuring the quality of the air supplied to the membrane oxygen generator 5; then, the filtered air is heated and sent to the membrane oxygen generator 5 for oxygen and nitrogen separation to obtain the required oxygen-enriched air; then, the control module accurately controls the oxygen supply pipeline system according to actual needs, and effectively distributes the oxygen-enriched air to different areas of the passenger compartment; finally, by real-time monitoring of the working status of each key component and adjusting the system working parameters, the stable operation and high-efficiency performance of the oxygen production system are ensured.

[0062] In a possible implementation, the control method includes the step of preheating the compressed air using a pre-membrane heater 4, and optimizing the physical properties of the air in the oxygen production process and improving the separation efficiency by controlling the temperature of the heater.

[0063] In the above scheme, preheating the compressed air by the pre-membrane heater 4 can effectively adjust the temperature of the air and optimize the physical properties of the air, thereby improving the separation efficiency in the membrane oxygen production process. This temperature control strategy can not only ensure the efficient operation of the oxygen production system under different environmental conditions, but also help to extend the service life of the equipment and improve the overall performance and stability of the system.

[0064] In a possible implementation, the control method further includes automatically adjusting the oxygen supply according to the oxygen concentration in the vehicle compartment and the passenger demand.

[0065] In the above scheme, by real-time monitoring of the oxygen concentration and passenger demand in the car and intelligently adjusting the oxygen supply, it can not only ensure that the oxygen level in the car meets the health and comfort needs of the passengers, but also optimize energy use and improve the economy and environmental friendliness of the system.

[0066] In a possible implementation, when the oxygen generator is running, the fresh air volume is automatically adjusted according to the oxygen concentration and temperature in the vehicle compartment.

[0067] In the above scheme, the oxygen generator and the air-conditioning system are linked and controlled to automatically adjust the fresh air volume according to the oxygen concentration and temperature in the car, which not only ensures the comfort and health of the passengers, but also optimizes the air quality and ensures the stability and comfort of the environment in the car.

[0068] In a possible implementation, the control method further includes performing automatic preheating according to ambient temperature control. When it is detected that the external ambient temperature is lower than a preset threshold, the heating system is activated to preheat the air compressor and the gas storage tank 2.

[0069] In the above scheme, the automatic preheating mechanism controlled by ambient temperature ensures that the oxygen production system can operate efficiently and stably even in a low-temperature environment. This automatic preheating strategy not only improves the environmental adaptability of the system, but also protects the equipment and extends its service life.

[0070] In a possible implementation, the control method further includes transmitting system operation data to a control center in real time, remotely monitoring the operation status of the oxygen production system, and adjusting the operation strategy in a timely manner.

[0071] In the above scheme, remote monitoring and management of the operating status of the oxygen production system is achieved by transmitting the system operation data to the control center in real time. This remote monitoring capability not only improves the reliability and safety of the system, but also facilitates system maintenance and fault diagnosis, ensuring the efficient and stable operation of the system. In addition to the control system equipped with each single device, the plateau dynamic oxygen generator system also has a remote control display in the local control room to realize the display of the main parameters of each part of the oxygen production system in each carriage, alarm and interlocking start and stop between each device. The PLC has a powerful human-machine interface, which can display the process and various parameters of the entire system, allowing the operator to grasp the operation of the entire system in a timely and accurate manner. The control of the oxygen production and supply system mainly includes the following three parts: 1). Air compression and processing system 2). Membrane separation oxygen production system 3). Oxygen distribution and safety control system The following is the control status of each part:

[0072] ① Air compression and treatment The air compressor in the oxygen production and supply system is an air-cooled two-stage micro-oil screw compressor, with a total of two units. The exhaust volume of a single unit can meet the oxygen production requirements of a membrane system, and the maximum exhaust pressure is 1.1Mpa (a). The air compressor is a fully automatic unmanned type, which can start and stop automatically within a preset pressure range (for example: 0.95~1.05MPa). During normal operation, only one unit is started and the other is used as a hot backup. The membrane oxygen production system has only one set, so the exhaust volume of the air compressor just meets the air intake requirements of the membrane system; when an air compressor stops during operation, the second air compressor starts immediately, and after a slight delay of a few seconds, the second set of air compressors starts to meet the nitrogen demand of the system.

[0073] ②Membrane separation oxygen production system The main components and control elements of the membrane oxygen generator are assembled in a box. The membrane oxygen generator has an independent PLC control system, which is located in the control panel on the main frame of the membrane oxygen generator. The control panel is equipped with start and stop buttons, alarm indicators, switch and oxygen analysis system. After the initial startup adjustment, the membrane oxygen generator can automatically adjust the exhaust volume according to the oxygen purity without the need for operator supervision. During the operation of the membrane oxygen generator, the control panel will display the oxygen production conditions, including temperature, oxygen concentration display, alarm, switch and standard efficiency.

[0074] ③ The distribution of oxygen-enriched air in the car and the control system of safe oxygen concentration The oxygen concentration in the car is controlled between 22% and 23%. When the oxygen concentration in the car is lower than 22.5%, the oxygen generator works to supply oxygen to the car; when the oxygen concentration in the car reaches 23%, the air compressor is in standby mode and stops supplying oxygen to the car. When the oxygen concentration in the car is higher than 23.5%, the oxygen generator safety alarm sounds to remind the crew to stop supplying oxygen to the car.

[0075] ④ Fresh air adjustment linkage The fresh air adjustment device is set up to adjust the oxygen concentration in the car, and it is jointly controlled by the air conditioning unit and the oxygen generator. Control process: When the vehicle runs to a high altitude area, the oxygen generator starts to work, and the oxygen-rich oxygen produced by the oxygen generator is supplied to the car in two ways: one is supplied to the distributed oxygen inhalation connector in the car for the oxygen mask; the other is supplied to the return air outlet of the air conditioning unit, mixed with the return air in the car and the fresh air outside the car, processed by the air conditioning unit, and then sent to the passenger compartment through the air supply duct and air supply outlet of the air conditioning unit.

[0076] The amount of oxygen supplied to the return air outlet of the air conditioning unit is limited to 23% based on the oxygen concentration measured in the car. If the measured concentration in the car exceeds 23%, the fresh air control door is opened wider to increase the fresh air volume; if the measured concentration in the car is lower than 22.5%, the fresh air control door is closed to reduce the fresh air volume.

[0077] The fresh air damper is adjusted by the oxygen generator sending a signal to the air conditioning unit controller, and the air conditioning unit controller sends a switch signal to the damper control motor. After the damper control motor executes the action, it feeds the signal back to the air conditioning unit controller.

[0078] At the same time, there is an exhaust air door controller at the air intake end of the exhaust fan. When the oxygen concentration in the car is high, the air door is opened wide and the signal is fed back to the air-conditioning controller; when the oxygen concentration in the car is low, the air door is closed small and the signal is fed back to the air-conditioning controller.

[0079] Since the air temperature before the membrane determines the oxygen temperature, too low or too high a temperature will cause changes in the cabin temperature, affecting the passenger experience. At the same time, the membrane separation oxygen production method requires a high temperature before the membrane, and a good operating temperature must be provided to keep the membrane separator working in the best state. A low temperature environment will cause the molecular sieve of the PSA oxygen generator to fail, which will directly affect the oxygen production results of the entire system. A heater is set before the membrane, and the heater is controlled by a PLC-controlled solid-state relay. The control logic is as follows: Figure 8 As shown. Among them, the parameters heating gain P, heating integral I, and heating differential D can be selected as fixed parameters, and fixed parameters need to be confirmed by a large number of tests, and the process is cumbersome. The utility model adopts the PIDAT instruction of Omron PLC, and after the output oscillation is very short, the PID parameters can be stabilized for heating control. The oxygen production system of the present application has the following beneficial effects:

[0080] The power supply standard of the air compressor loading solenoid valve is AC380V, which is consistent with the main circuit of the air compressor. This prevents the loading solenoid valve from accidentally losing power while the main circuit of the air compressor is not powered off, causing the loading valve to close. The internal pressure of the oil pipe will pour a large amount of oil back into the oil separator through the return oil pipe, causing oil leakage from the air compressor.

[0081] According to the low temperature environment common in plateaus where trains run, a matching optimization control scheme is designed. For example, the low temperature environment makes it difficult to start the air compressor under the train, and the lubricating oil solidifies, so the air compressor box heating and lubricating oil heating control are designed; considering the problem of low-temperature water accumulation and freezing in the air tank, which makes it impossible to drain, tank heating control is added; considering the problem of low temperature air entering the passenger compartment through the membrane, causing the passenger compartment temperature to be low, the heating function before the membrane is added.

[0082] Complete oxygen concentrator system control solution. Including startup sequence, fault detection, interlocking of each device, emergency mode, network data transmission, etc.

[0083] The oxygen generator pre-membrane heating control solution adopts an adaptive PID algorithm to ensure stable cabin temperature and improve passenger comfort.

[0084] The entire oxygen production and supply system can achieve interlocking start and stop, and automatically handle some sudden failures, meeting the requirements of safe, reliable, long-term and stable oxygen supply to the carriage.

[0085] The above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation method of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for which protection is requested in the utility model.

Claims

1. A plateau railway passenger car oxygen production system, characterized in that: include: The air compressor (1), the three-stage filter system (3), the membrane oxygen generator (5) and the oxygen supply pipeline system are connected in sequence, and also include a control module; wherein, The air compressor (1) is used to compress external air and provide pressurized air; The three-stage filter system (3) is used to remove impurities and liquid water from the compressed air; The membrane oxygen generator (5) is used to separate nitrogen and oxygen in the filtered air and output oxygen-enriched air; The control module includes local control and network centralized control modes, which are used to control the operation of the oxygen production system; The oxygen supply pipeline system supplies oxygen-enriched air in two ways. One way enters the main air duct of the air conditioner and mixes with the fresh air before being diffused into the passenger compartment. The other way supplies the oxygen-enriched air outlets at each compartment or seat in the carriage. A pre-membrane heater (4) is provided between the three-stage filter system (3) and the membrane oxygen generator (5) for heating the air entering the membrane oxygen generator (5) from the three-stage filter system (3); It also includes a fresh air regulating device linked to the air conditioning system. When the oxygen generator is running, the fresh air regulating device is configured to be controlled by the control module to adjust the fresh air volume.

2. The oxygen production system according to claim 1, characterized in that: The oxygen supply pipeline system includes a safety control module, which is used to automatically adjust the oxygen supply according to the oxygen concentration in the vehicle compartment.

3. The oxygen production system according to claim 2, characterized in that: It also includes an ambient temperature detection module configured to detect the external ambient temperature. When the external ambient temperature is lower than a set threshold, the heating device is automatically started to preheat the air compressor (1) and the air storage tank (2) connected between the three-stage filter system (3) and the air compressor (1).

4. The oxygen production system according to claim 3, characterized in that: The system also includes a remote monitoring module, through which operators in the control center can remotely monitor the system operating status, adjust control parameters, and remotely start or stop equipment.

5. The oxygen production system according to claim 4, characterized in that: The control module is configured to adopt an adaptive PID control algorithm for automatically adjusting the temperature of the pre-film heater (4).

6. The oxygen production system according to claim 5, characterized in that: in, The number of air compressors (1) is set to two, one of which is used as a backup, and the backup air compressor is started when the other air compressor fails.

7. The oxygen production system according to claim 6, characterized in that: in, Each compartment of the oxygen supply pipeline system is provided with connection interfaces at the first and second ends, and oxygen-enriched air is communicated between the compartments through quick-connect hoses.

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