Train fresh air oxygen supplement system and control method thereof

Abstract

The application discloses a train fresh air oxygen supplement system and a control method thereof, and relates to a fresh air system. The train fresh air oxygen supplement system comprises a first air inlet channel and a second air inlet channel. The air inlet of the first air inlet channel is arranged at the head of the train, so that when the train is running, air can directly enter the first air inlet channel from the air inlet. In order to avoid the lack of fresh air when the train is running slowly or is stopped, the application further provides the second air inlet channel, and air enters the second air inlet channel through a fan. Therefore, when the first air inlet channel can meet the demand of the train, the fan of the second air inlet channel does not need to be started, energy is saved, and the use cost is reduced. When the first air inlet channel cannot meet the demand of the train, the fan of the second air inlet channel is started, so that the amount of fresh air can meet the use demand. Meanwhile, the oxygen concentration of outdoor air is increased through a membrane separator assembly, and then the outdoor air is mixed with the outdoor air, so that the required oxygen concentration is achieved.

Description

Technical Field

[0001] This application relates to the field of fresh air system technology, and in particular, to a train fresh air oxygen replenishment system and its control method. Background Technology

[0002] In recent years, people have conducted extensive research on the sources, hazards, and physicochemical properties of air pollutants in enclosed spaces, and have developed a number of air purification technologies that have achieved good air purification results.

[0003] However, the long-term oxygen deficiency in enclosed environments, which also poses a threat to human health, has not received sufficient attention. Increasing the oxygen content in enclosed environments allows people to eliminate fatigue in a fresh and pleasant setting, quickly restore physical and mental energy, and also achieve good health and medical benefits.

[0004] Current oxygen supplementation systems mainly increase the oxygen content in the environment by increasing the fresh air volume. In applications such as trains, the fresh air system draws air in through the air inlet above the roof and controls the air volume through the fan. To increase the fresh air volume, either the air intake area of ​​the air inlet needs to be increased or the fan speed needs to be increased, which will increase costs in either case. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this application provides a fresh air oxygen supply system for trains and its control method, in order to solve the problem that the existing fresh air oxygen supply systems for trains all introduce air through the air inlet above the roof and control the air volume through the fan. If the fresh air volume is to be increased, either the air intake area of ​​the air inlet should be increased or the fan speed should be increased. Either way, it will increase the cost.

[0006] The technical solution adopted by this application to solve its technical problem is:

[0007] On the one hand, a fresh air oxygen supply system for trains is provided, including: an air intake duct;

[0008] The air intake channel includes a first air intake channel and a second air intake channel;

[0009] The air inlet of the first air intake channel is located at the front of the train. When the train is moving, air enters the first air intake channel through the air inlet.

[0010] The second air intake channel includes a fan, through which air is introduced into the second air intake channel.

[0011] Furthermore, an opening regulating valve is provided in the first air intake channel to control the air volume entering the first air intake channel.

[0012] Pneumatic valves are respectively installed in the first air inlet channel and the second air inlet channel.

[0013] Furthermore, filters are provided in both the first air inlet channel and the second air inlet channel.

[0014] Furthermore, it also includes: oxygen regulation channels;

[0015] The oxygen regulation channel includes a first proportional valve, a second proportional valve, and a third proportional valve, a first regulation channel, a second regulation channel, and a preset number of mixers;

[0016] The first air inlet channel and the second air inlet channel are respectively connected to the air inlet of the first proportional valve;

[0017] The first regulating channel and the second regulating channel are respectively connected to the outlet of the first proportional valve;

[0018] The first regulating channel is connected to the air inlet of the second proportional valve, and each air outlet of the second proportional valve is connected to a mixer;

[0019] The second regulating channel includes a membrane separator assembly, wherein the nitrogen-rich outlet of the membrane separator assembly is connected to the first sub-channel, and the oxygen-rich outlet is connected to the second sub-channel.

[0020] The second sub-channel is connected to the air inlet of the third proportional valve, and each air outlet of the third proportional valve is connected to a mixer;

[0021] Each mixer is used to mix the air from one outlet of the second proportional valve and the air from one outlet of the third proportional valve.

[0022] The first proportional valve is used to adjust the amount of air entering the first regulating channel and the second regulating channel respectively through the air inlet channel;

[0023] The second proportional valve is used to adjust the amount of air entering each mixer from the first regulating channel;

[0024] The third proportional valve is used to regulate the amount of air entering each mixer from the second sub-channel.

[0025] Furthermore, the second sub-channel includes an oxygen detection device for measuring the oxygen concentration of the air in the second sub-channel.

[0026] Furthermore, the first regulating channel and the second sub-channel are each equipped with a voltage stabilizing device.

[0027] Furthermore, the first sub-channel is connected to the external environment, or the first sub-channel is connected to a preset collection device.

[0028] Furthermore, it also includes: air supply channels, with each mixer connected to a carriage of the train via one of the air supply channels;

[0029] Each of the aforementioned air supply channels is equipped with a flow valve.

[0030] On the other hand, a control method for a train fresh air oxygen supply system is provided, applied to the aforementioned train fresh air oxygen supply system, the method comprising:

[0031] Based on the actual number of passengers and the target oxygen concentration in each carriage, the required fresh air volume for the train is determined; based on the current speed of the train, the first air intake volume of the first air intake channel is determined.

[0032] If the first air intake volume is less than the required fresh air volume, then the second air intake channel is opened.

[0033] Furthermore, it also includes: if the first air intake volume is greater than or equal to the required fresh air volume, then the second air intake channel is controlled to close, and the opening degree of the opening degree regulating valve of the first air intake channel is controlled according to the difference between the first air intake volume and the required fresh air volume, wherein the opening degree regulating valve is used to control the air intake volume entering the first air intake channel.

[0034] Furthermore, the control of opening the second air intake channel includes:

[0035] The difference between the required fresh air volume and the first air intake volume is used as the second air intake volume of the second air intake channel.

[0036] The speed of the fan in the second air intake channel is controlled according to the second air intake volume.

[0037] Furthermore, determining the required fresh air volume for the train based on the actual number of passengers and the target oxygen concentration in each carriage includes:

[0038] The required fresh air volume for each carriage is determined based on the actual number of passengers in each carriage and the preset fresh air volume required per person per unit time.

[0039] Based on the required fresh air volume for each carriage, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each carriage, the first regulating fresh air volume for the first regulating channel and the required fresh air volume for the second sub-channel are calculated respectively.

[0040] The second regulating fresh air volume required for the second regulating channel is calculated based on the fresh air volume required for the second sub-channel and the air volume conversion efficiency of the membrane separator assembly. The air volume conversion efficiency = air volume of the second sub-channel / air volume entering the membrane separator assembly.

[0041] The sum of the first and second adjusted fresh air volumes is taken as the required fresh air volume for the train.

[0042] Furthermore, it also includes:

[0043] The opening ratio of each outlet of the first proportional valve is determined based on the first and second adjusted fresh air volumes.

[0044] And / or, based on the required fresh air volume for each car, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each car, determine the opening ratio of each outlet of the second proportional valve and the third proportional valve.

[0045] Beneficial effects:

[0046] This application provides a train fresh air oxygen supply system and its control method. The train fresh air oxygen supply system includes an air intake channel, which comprises a first air intake channel and a second air intake channel. Since the air intake of the first air intake channel is located at the front of the train, air can directly enter the first air intake channel from this intake when the train is moving. To avoid a lack of fresh air when the train is moving slowly or stopped, this application also provides a second air intake channel. Air is drawn into the second air intake channel by a fan. Thus, when the first air intake channel can meet the train's needs, the fan in the second air intake channel does not need to be turned on, saving energy and reducing operating costs. When the first air intake channel cannot meet the train's needs, the fan in the second air intake channel is turned on to ensure that the fresh air volume meets the usage requirements. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of a train fresh air oxygen supply system provided in an embodiment of this application;

[0049] Figure 2 This is a flowchart of a train fresh air oxygen supply system control method provided in an embodiment of this application;

[0050] Figure 3 This is a flowchart of a specific train fresh air oxygen supply system control method provided in the embodiments of this application. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0052] Reference Figure 1 This application provides a train fresh air oxygen supply system, including: an air intake duct;

[0053] The air intake channel includes a first air intake channel and a second air intake channel;

[0054] The air inlet of the first air intake channel is located at the front of the train. When the train is moving, air enters the first air intake channel through the air inlet; this eliminates the need for a fan and can greatly save energy.

[0055] The second air intake duct includes a fan, which draws air into the duct. The purpose of the second air intake duct is to activate the fan when the airflow from the first air intake duct is insufficient, ensuring the train's fresh air requirements are met. Because of the fan, the installation location of the second air intake duct's inlet is unrestricted and can be determined according to actual needs.

[0056] It should be noted that the fan installed in the second air intake duct can adjust the air intake volume of the second air intake duct according to the fan speed. However, since no fan is installed in the first air intake duct, its air intake volume is only related to the air intake area and the train speed. When the train speed is high, the air intake volume of the first air intake duct may be large, which may affect the normal temperature or humidity of the room.

[0057] Therefore, to facilitate adjustment of the air intake volume of the first air intake channel, as an optional implementation in this application embodiment, an opening adjustment valve (i.e., Figure 1 The air inlet valve (in the middle) is used to control the amount of air entering the first air inlet channel. It can be understood that when the opening of the regulating valve is 0, it is equivalent to the first air inlet channel being closed, which is used when fresh air is not needed.

[0058] Pneumatic valves are installed in both the first and second air inlet channels. These valves are used to increase the air pressure in the air inlet channels for subsequent use.

[0059] It is understandable that in order to prevent the air intake channel from becoming blocked, a filter device needs to be installed in the air intake channel. Therefore, the first air intake channel and the second air intake channel are respectively equipped with filters.

[0060] In this embodiment, the train fresh air supply system includes a first air intake channel and a second air intake channel. Since the air inlet of the first air intake channel is located at the front of the train, air can directly enter the first air intake channel from this inlet when the train is moving. To prevent a lack of fresh air when the train is moving slowly or stopped, this application also provides a second air intake channel. Air is drawn into the second air intake channel by a fan. This way, when the first air intake channel meets the train's needs, the fan in the second air intake channel does not need to be turned on, saving energy and reducing operating costs. When the first air intake channel cannot meet the train's needs, the fan in the second air intake channel is turned on to ensure that the fresh air volume meets the usage requirements.

[0061] However, even with sufficient fresh air, if the outdoor oxygen concentration is low, it cannot provide enough oxygen inside the train. When the oxygen concentration is low, increasing the fresh air volume is necessary to provide sufficient oxygen, but this increases the temperature and humidity inside the train, especially in high-altitude areas. To solve this technical problem, this application embodiment provides an oxygen regulation channel after the air intake channel;

[0062] The oxygen regulation channel includes a first proportional valve, a second proportional valve, and a third proportional valve, a first regulation channel, a second regulation channel, and a preset number of mixers;

[0063] The first air inlet channel and the second air inlet channel are respectively connected to the air inlet of the first proportional valve; that is, the fresh air entering through either the first air inlet channel or the second air inlet channel enters the first proportional valve.

[0064] The first regulating channel and the second regulating channel are respectively connected to the outlet of the first proportional valve.

[0065] The first regulating channel is connected to the air inlet of the second proportional valve, and each air outlet of the second proportional valve is connected to a mixer; the outdoor air from the first regulating channel directly enters the mixer after passing through the second proportional valve.

[0066] The second regulating channel includes a membrane separator assembly. The nitrogen-enriched outlet of the membrane separator assembly is connected to the first sub-channel, and the oxygen-enriched outlet is connected to the second sub-channel. The second regulating channel obtains oxygen-enriched air and nitrogen-enriched air through the membrane separator. The nitrogen-enriched air is discharged to the external environment through the first sub-channel or discharged to a dedicated collection device through the first sub-channel for application in other scenarios.

[0067] The second sub-channel is connected to the air inlet of the third proportional valve, and each air outlet of the third proportional valve is connected to a mixer; oxygen-enriched air is connected to the third proportional valve through the second sub-channel. It then enters the mixer and mixes with the outdoor air from the first regulating channel.

[0068] Each mixer is used to mix air from one outlet of the second proportional valve and air from one outlet of the third proportional valve; the outdoor air entering the mixer through the second proportional valve has a low oxygen concentration, while the air entering the mixer through the third proportional valve has a high oxygen concentration. This allows for adjustments to obtain different air concentrations based on the amount entering.

[0069] The first proportional valve is used to adjust the amount of air entering the first regulating channel and the second regulating channel respectively through the air inlet channel; such as Figure 1 As shown, the air ratio a of the first regulating channel and the air ratio b of the second regulating channel are determined by the first proportional valve.

[0070] The second proportional valve is used to adjust the amount of air entering each mixer from the first regulating channel; such as Figure 1 As shown, the air ratio entering mixer 1 is c, the air ratio entering mixer 2 is d, and the air ratio entering mixer 3 is e.

[0071] The third proportional valve is used to regulate the amount of air entering each mixer from the second sub-channel. For example... Figure 1 As shown, the proportion of air entering mixer 1 is f, the proportion of air entering mixer 2 is g, and the proportion of air entering mixer 3 is h.

[0072] It should be noted that, although Figure 1 Three mixers are given, but this is only an example. The number of mixers can be one, meaning all cars use the same oxygen concentration, or the same as the number of cars, meaning each car has a different oxygen concentration. It can also be more than the number of cars, providing redundancy so that a backup mixer can take over if one fails. Alternatively, it can be less than the number of cars, in which case at least two cars use the same oxygen concentration.

[0073] To ensure that each mixer can deliver fresh air to any carriage, a preferred implementation of this application includes an air supply duct, with each mixer connected to a carriage of the train via one of these ducts; each air supply duct is equipped with a flow valve. Figure 1 The flow valves are 1, 2, 3, 4, 5, 6, 7, 8, and 9.

[0074] Understandable, Figure 1 The carriages 1, 2, and 3 shown are merely examples and do not represent that there are only three carriages in actual use; more carriages can be added in practice. Carriages 1, 2, and 3 represent three different configurations.

[0075] Mode 1: High oxygen mode, with an oxygen concentration of 30%, which can be used for emergency medical treatment or sports. It corresponds to the oxygen concentration after mixer 1 in the figure.

[0076] Mode 2: Normal mode, with an oxygen concentration of 21%, which is the normal oxygen concentration in low-altitude areas, corresponding to the oxygen concentration after mixer 2 in the figure.

[0077] Mode 3: Low oxygen mode, the oxygen concentration is the average of the ambient oxygen concentration and the normal low-altitude oxygen concentration of 21%, for use by people who live in high-altitude areas year-round and have adapted to low-oxygen environments, corresponding to the oxygen concentration after mixer 3 in the figure.

[0078] Because it is ultimately necessary to ensure that the oxygen concentration within the mixer is at a preset level, in one embodiment, an oxygen concentration detection device is installed in each mixer. When the detected oxygen concentration is lower than the preset level, the amount of air entering the mixer through the third proportional valve is increased and / or the amount of air entering the mixer through the second proportional valve is decreased. When the detected oxygen concentration is higher than the preset level, the amount of air entering the mixer through the third proportional valve is decreased and / or the amount of air entering the mixer through the second proportional valve is increased.

[0079] However, this method has two problems. First, when there are many mixers, more oxygen concentration detection equipment is needed, resulting in higher costs. Second, when the oxygen concentration in the mixer is not equal to the preset oxygen concentration, it can only be adjusted slowly, and the amount of air entering the mixer through the second and third proportional valves cannot be directly determined.

[0080] Based on the above problems, in another embodiment, the second sub-channel of this application includes an oxygen detection device for measuring the oxygen concentration of the air in the second sub-channel, i.e. Figure 1 The oxygen analyzer directly measures the oxygen concentration in the second sub-channel. The outdoor air oxygen concentration can be obtained through measurement or by calculating the oxygen partial pressure at the current altitude, and then by combining the altitude oxygen partial pressure with the outdoor ambient pressure. Once these two oxygen concentrations are known, the target oxygen concentration can be obtained by directly adjusting the proportions of the second and third proportional valves entering the mixer.

[0081] In a preferred implementation of this application, the first regulating channel and the second sub-channel are each equipped with a voltage stabilizing device. Figure 1 Medium-pressure stabilizer tank.

[0082] Figure 1The air vent is aligned with the direction of the train's front, allowing fresh air to be introduced while the train is moving. The vent valve is freely adjustable to control the airflow. A pneumatic valve increases air pressure to meet the working pressure of the membrane separator assembly. A proportional valve divides the gas flow according to a set ratio. The membrane separator assembly separates oxygen from the air. An oxygen analyzer detects oxygen concentration. A pressure stabilizing tank regulates the pressure of the gas entering the mixer. A flow valve regulates the amount of fresh air entering the carriage. The mixer evenly mixes two streams of gas with different oxygen concentrations. Separate pipes, each equipped with a flow valve, are installed after mixers 1-3, leading to the carriage.

[0083] Fresh air enters through an air vent, and the vent valve regulates the airflow into the system. It then passes through a filter and a pneumatic valve, before being split into two streams, a and b, by a first proportional valve. Stream a passes through a membrane separator assembly; the nitrogen-enriched air, after oxygen separation, is discharged to the outside environment. The separated oxygen-enriched air passes through an oxygen analyzer and a pressure stabilizing tank, and is then split into three streams (f, g, and h) by a third proportional valve before entering mixers 1-3. Stream b passes through the pressure stabilizing tank and is split into three streams (c, d, and e) by a second proportional valve before entering mixers 1-3. The mixed air then enters the passenger compartment through a flow valve.

[0084] Fresh air passes through a filter, and its volume is regulated by a fan. Then, it passes through a pneumatic valve, and is split into two streams, denoted as streams a and b, by a first proportional valve. Stream a passes through a membrane separator assembly; the nitrogen-enriched air, after oxygen separation, is discharged to the outside environment. The separated oxygen-enriched air passes through an oxygen analyzer and a pressure stabilizing tank, and is then split into three streams (f, g, and h) by a third proportional valve before entering mixers 1-3. Stream b passes through the pressure stabilizing tank and is split into three streams (c, d, and e) by a second proportional valve before entering mixers 1-3. The mixed air then enters the passenger compartment through a flow valve.

[0085] The air vents in the main passage are oriented towards the front of the train, allowing air to enter automatically when the train is moving. When the airflow in the main passage is sufficient, the fans do not turn on, meaning the secondary passage is in a non-operating state. When the train is moving slowly or has stopped, the airflow in the main passage may be insufficient, at which point the fans will turn on, and the secondary passage will enter an operational state to supplement the airflow.

[0086] The train fresh air oxygen supply system provided in this application includes a first air intake channel and a second air intake channel. Since the air inlet of the first air intake channel is located at the front of the train, air can directly enter the first air intake channel from this inlet when the train is moving. To avoid a lack of fresh air when the train is moving slowly or stopped, this application also provides a second air intake channel. Air is drawn into the second air intake channel by a fan. This way, when the first air intake channel can meet the train's needs, the fan in the second air intake channel does not need to be turned on, saving energy and reducing operating costs. When the first air intake channel cannot meet the train's needs, the fan in the second air intake channel is turned on to ensure that the fresh air volume meets the usage requirements. Simultaneously, a membrane separator assembly increases the oxygen concentration of the outdoor air before mixing it with the outdoor air to achieve the required oxygen concentration.

[0087] Based on the same inventive concept, this application provides a control method for a train fresh air oxygen supply system, applied to the train fresh air oxygen supply system provided in the above embodiments, such as... Figure 2 As shown, the method includes:

[0088] S21: Determine the required fresh air volume for the train based on the actual number of passengers and the target oxygen concentration in each carriage; determine the first air intake volume of the first air intake channel based on the current speed of the train;

[0089] Specifically, the required fresh air volume for each carriage is determined based on the actual number of passengers in each carriage and the preset fresh air volume required per person per unit time. The required fresh air volume for each carriage = actual number of passengers in the carriage * preset fresh air volume required per person per unit time.

[0090] Based on the required fresh air volume for each carriage, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each carriage, the first regulating fresh air volume for the first regulating channel and the required fresh air volume for the second sub-channel are calculated respectively; specifically, the formula exists:

[0091] The target outlet air volume of the second proportional valve + the target outlet air volume of the third proportional valve = the fresh air volume required for a single carriage.

[0092] The target outlet airflow of the second proportional valve * outdoor oxygen concentration + the target outlet airflow of the third proportional valve * oxygen concentration in the second sub-channel = mixer volume * target oxygen concentration, where the target outlet of the second proportional valve refers to the outlet connected to the mixer with the target oxygen concentration; the target outlet of the third proportional valve refers to the outlet connected to the mixer with the target oxygen concentration.

[0093] This allows us to obtain the air volume at each outlet of the second and third proportional valves, and then add the air volumes at each outlet to obtain the air volumes of the second and third proportional valves. The air volume of the second proportional valve is the first adjustment of the fresh air volume, and the air volume of the third proportional valve is the fresh air volume required for the second sub-channel.

[0094] The second regulating fresh air volume required for the second regulating channel is calculated based on the fresh air volume required for the second sub-channel and the air volume conversion efficiency of the membrane separator assembly. The air volume conversion efficiency = air volume of the second sub-channel / air volume entering the membrane separator assembly; the second regulating fresh air volume = fresh air volume required for the second sub-channel / air volume conversion efficiency.

[0095] The sum of the first and second adjusted fresh air volumes is taken as the required fresh air volume for the train.

[0096] Furthermore, the opening ratio of each outlet of the first proportional valve is determined based on the first and second regulated fresh air volumes; the opening ratio is the ratio of the first and second regulated fresh air volumes.

[0097] The opening ratios of the outlets of the second and third proportional valves are determined based on the required fresh air volume for each carriage, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each carriage. Since the air volume of each outlet is already known, the air volume ratio is the opening ratio.

[0098] S22: If the first air intake volume is less than the required fresh air volume, then control the second air intake channel to open.

[0099] The control of opening the second air inlet channel includes:

[0100] The difference between the required fresh air volume and the first air intake volume is used as the second air intake volume of the second air intake channel; the speed of the fan in the second air intake channel is controlled according to the second air intake volume.

[0101] As a preferred implementation of this application, it further includes: if the first air intake volume is greater than or equal to the required fresh air volume, then controlling the second air intake channel to close, and controlling the opening of the opening adjustment valve of the first air intake channel according to the difference between the first air intake volume and the required fresh air volume, wherein the opening adjustment valve is used to control the air intake volume entering the first air intake channel.

[0102] The train fresh air oxygen supply system control method provided in this application embodiment eliminates the need to activate the fan in the second air intake channel when the first air intake channel can meet the train's needs, thus saving energy and reducing operating costs. Conversely, when the first air intake channel cannot meet the train's needs, the fan in the second air intake channel is activated to ensure sufficient fresh air volume. Simultaneously, the oxygen concentration of outdoor air is increased by a membrane separator assembly before mixing with the outdoor air to achieve the required oxygen concentration.

[0103] To more clearly illustrate the control method of this application embodiment, this embodiment uses... Figure 1 Taking the train's fresh air oxygen supply system as an example, a specific control method is provided, such as... Figure 2 As shown:

[0104] The air vents in the main passage are oriented towards the front of the train, allowing air to enter automatically when the train is moving. When the airflow in the main passage is sufficient, the fans do not turn on, meaning the secondary passage is in a non-operating state. When the train is moving slowly or has stopped, the airflow in the main passage may be insufficient, at which point the fans will turn on, and the secondary passage will enter an operational state to supplement the airflow.

[0105] The system offers three modes for users to choose from:

[0106] Mode 1: High-oxygen mode, oxygen concentration is 30%, suitable for emergency medical treatment or sports use. Figure 1 Oxygen concentration after mixer 1;

[0107] Mode 2: Standard mode, oxygen concentration is 21%, which is the normal oxygen concentration at low altitudes. Figure 1 Oxygen concentration after mixer 2.

[0108] Mode 3: Low-oxygen mode. The oxygen concentration is the average of the ambient oxygen concentration and 21% of the normal low-altitude oxygen concentration. This mode is for individuals who have lived in high-altitude areas year-round and have adapted to low-oxygen environments. Figure 1 Oxygen concentration after mixer 3.

[0109] The concentration setting of the above mode is achieved by adjusting the mixing ratio of oxygen-enriched air and outdoor air through a proportional valve.

[0110] first step:

[0111] The train system imports the number of passengers in each carriage and the user's mode selection, and calculates the required air volume for each mode (i.e., the air volume required to enter mixing chambers 1-3 respectively):

[0112] Q1=N1P; Q2=N2P; Q3=N3P;

[0113] Q1, Q2, and Q3 represent the total air volume required for carriages 1, 2, and 3 when selecting modes 1, 2, and 3, respectively. N1, N2, and N3 represent the number of people in the corresponding carriages, i.e., N1 is the total number of people in carriage 1 when selecting mode, and N2 / N3 are similarly calculated. P is the fresh air volume required per person per unit time. Therefore, the air volume required to enter mixing chambers 1-3 can be calculated.

[0114] Step Two:

[0115] The altitude of the train is imported from the train's location, and the outdoor O2 concentration η is calculated. PO2 is the partial pressure of oxygen at this altitude, and P1 is the outdoor ambient pressure.

[0116] Step 3:

[0117] O2 concentration η1 is detected by an oxygen analyzer.

[0118] Step 4:

[0119] It should be noted that the test checks whether Q1, Q2, and Q3 are all zero.

[0120] If any airflow value is 0, then the corresponding airflow before the mixer is 0, and the corresponding proportional valve ratio is 0. Then proceed to the next step, where the corresponding airflow and proportional valve ratio are no longer calculated. For example, if Q1 and Q2 are 0, then Qc, Qf, Qd, and Qg are 0, and the proportional valves c, f, d, and g are 0. Then proceed to the next step, where Qc, Qf, Qd, Qg, and the proportional valves c, f, d, and g are no longer calculated.

[0121] If Q1, Q2, and Q3 are all non-zero, calculate the required unit-time airflow and proportional values ​​c, d, e, f, g, and h after the second and third proportional valves, and adjust the proportional valves accordingly.

[0122]

[0123] Where V is the mixer volume, and Qc is... Figure 1 In the system diagram, the unit time air volume of branch c is Qd. Figure 1 In the system diagram, the unit time air volume of branch d is Qe. Figure 1 The system diagram shows the air volume per unit time for branch e. ​​c, d, and e represent the adjustment ratios of the second proportional valve. Qf is... Figure 1 In the system diagram, the unit time air volume of branch f is Qg. Figure 1 In the system diagram, the air volume per unit time for branch g is Qh. Figure 1 In the system diagram, the air volume per unit time for branch h is shown, and f, g, and h represent the adjustment ratios of the third proportional valve. 0.3 represents an oxygen concentration of 30%, and 0.21 represents an oxygen concentration of 21%.

[0124] Calculation formula: Taking mixer 1 as an example, given a post-mixer concentration of 0.3, the oxygen concentrations η and η1 of the two airflows before mixing, the required unit airflow Q1, and the mixer volume V:

[0125] Then, according to Q1=N1P=Qc+Qf, 0.3=(Qcη+Qfη1) / V, the air volume of Qc and Qf can be calculated.

[0126] Step 5:

[0127] Calculate the required air volume per unit time and the a / b ratio after the first proportional valve, and adjust the proportional valve accordingly: Qb = Qc + Qd + Qe, λ is the airflow conversion efficiency of the membrane separator component, and Qa is... Figure 1 In the system diagram, the unit time air volume of branch a is Qb. Figure 1 The system diagram shows the air volume per unit time for branch b. a and b represent the adjustment ratios of the first proportional valve.

[0128] Step 6:

[0129] Calculate the required fresh air volume:

[0130]

[0131] Q represents the required fresh air volume for the train, which is calculated based on the user's selected mode.

[0132] Q4 is the air intake volume of the air outlet valve, which is the air intake volume of the main channel. Q4 is the actual air volume entering the system from the main channel.

[0133] Q5 is the fan compensation air volume, which is the secondary channel air volume. Q5 is the actual air volume entering the system through the secondary channel.

[0134] θ is the opening coefficient of the air vent valve. The air vent valve is in the initial state of maximum opening by default, and the value of θ is at its maximum in the initial state by default.

[0135] S is the air outlet area; V is the vehicle speed; y is the fan slope coefficient; L is the rotational speed; b1 is the fan constant.

[0136] Step 7:

[0137] Determine whether the absolute value of the difference between Q and Q4 is less than or equal to k (|Q-Q4|≤k), where k is the allowable deviation value.

[0138] If so, it means the system's required airflow is approximately equal to the inlet airflow at the air vent valve, and the inlet airflow at the air vent valve is sufficient to meet the system's airflow requirements. Proceed to step nine.

[0139] If not, it means that the air volume at the air outlet valve inlet is much greater than or much less than the air volume required by the system, and we will proceed to the next step for judgment.

[0140] Step 8:

[0141] Determine if Q4 is greater than the value of Q (Q4 > Q);

[0142] If yes: This means that the air volume at the inlet valve of the air valve is much greater than the air volume required by the system. Calculate θ = Q / (S*V), determine the opening degree of the air outlet valve, and adjust the air outlet valve to proceed to step nine.

[0143] If not: it means that the air volume of the inlet valve of the air valve is much less than the air volume required by the system. The secondary channel needs to be opened to supplement fresh air. Calculate the required supplementary air volume Q5=Q-Q3=y(L)+b1, determine the speed and start the fan, and proceed to the next step.

[0144] Step 9:

[0145] Detect the required airflow Q' = N'P for each compartment, open the corresponding mode mixer flow valve, and close the remaining flow valves. For example, if compartment 1 is in mode 1, then open flow valve 1 and close flow valves 4 and 7. Then run for n minutes and return to step one.

[0146] This system and control method detects the oxygen concentration in outdoor and oxygen-enriched air, calculates and adjusts the opening of proportional valves and flow valves as well as the inlet air volume, to achieve three different operating modes for users to choose from, thus enabling the system to replenish oxygen on demand.

[0147] The specific train fresh air oxygen supply system control method provided in this application embodiment adopts a main and auxiliary dual-channel air intake oxygen supply. When the air volume is insufficient, the auxiliary channel supplements air through a fan. The oxygen in the air is separated by a membrane separator component, and the ratio of outdoor air to oxygen-enriched air entering the mixer is adjusted to achieve the switching of three different concentration modes of the system. By adopting a multi-mode dual-channel train fresh air oxygen supply system for autonomous control, the oxygen concentration of outdoor and oxygen-enriched fresh air is obtained based on the oxygen analyzer, air volume calculation, and fresh air adjustment ratio calculation. Furthermore, the opening degree of each proportional valve, air outlet valve, and fan speed are autonomously adjusted. The number of passengers and mode selection information of each carriage are imported from the train end, and the opening degree of the flow valve is autonomously adjusted to effectively regulate the oxygen content of the air and human comfort.

[0148] Based on the same inventive concept, this application also provides a control system for a train fresh air oxygen replenishment system, comprising:

[0149] At least one processor and at least one memory;

[0150] The memory stores the executable instructions of the processor;

[0151] The processor is configured to execute the identity recognition method provided in the above embodiments.

[0152] The train fresh air oxygen supply system control system provided in this application embodiment stores executable instructions for the processor in a memory. When these executable instructions are executed, the processor can ensure that the second air intake fan does not need to be turned on when the first air intake channel can meet the train's needs, thus saving energy and reducing operating costs. Conversely, when the first air intake channel cannot meet the train's needs, the second air intake fan is turned on to ensure that the fresh air volume meets the usage requirements. Simultaneously, the oxygen concentration of the outdoor air is increased by the membrane separator assembly before being mixed with the outdoor air to achieve the required oxygen concentration.

[0153] It should be noted that in the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "a plurality of" means at least two.

[0154] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

Claims

1. A train fresh air oxygen supply system, characterized in that, include: Air intake duct; The air intake channel includes a first air intake channel and a second air intake channel; The air inlet of the first air intake channel is located at the front of the train. When the train is moving, air enters the first air intake channel through the air inlet. The second air intake duct includes a fan, through which air is drawn into the second air intake duct; It also includes: oxygen regulation channels; The oxygen regulation channel includes a first proportional valve, a second proportional valve, and a third proportional valve, a first regulation channel, a second regulation channel, and a preset number of mixers; The first air inlet channel and the second air inlet channel are respectively connected to the air inlet of the first proportional valve; The first regulating channel and the second regulating channel are respectively connected to the outlet of the first proportional valve; The first regulating channel is connected to the air inlet of the second proportional valve, and each air outlet of the second proportional valve is connected to a mixer; The second regulating channel includes a membrane separator assembly, wherein the nitrogen-rich outlet of the membrane separator assembly is connected to the first sub-channel, and the oxygen-rich outlet is connected to the second sub-channel. The second sub-channel is connected to the air inlet of the third proportional valve, and each air outlet of the third proportional valve is connected to a mixer; Each mixer is used to mix the air from one outlet of the second proportional valve and the air from one outlet of the third proportional valve. The first proportional valve is used to adjust the amount of air entering the first regulating channel and the second regulating channel respectively through the air inlet channel; The second proportional valve is used to adjust the amount of air entering each mixer from the first regulating channel; The third proportional valve is used to regulate the amount of air entering each mixer from the second sub-channel.

2. The system according to claim 1, characterized in that: An opening adjustment valve is installed in the first air inlet channel to control the amount of air entering the first air inlet channel.

3. The system according to claim 1, characterized in that: Pneumatic valves are respectively installed in the first air inlet channel and the second air inlet channel.

4. The system according to claim 1, characterized in that: The first air inlet channel and the second air inlet channel are each equipped with a filter.

5. The system according to claim 1, characterized in that: The second sub-channel includes an oxygen detection device for measuring the oxygen concentration of the air in the second sub-channel.

6. The system according to claim 1, characterized in that: The first regulating channel and the second sub-channel are each equipped with a voltage stabilizing device.

7. The system according to claim 1, characterized in that: The first sub-channel is connected to the external environment, or the first sub-channel is connected to a preset collection device.

8. The system according to claim 1, characterized in that, Also includes: Air supply ducts, each mixer is connected to a carriage of the train via one of the air supply ducts; Each of the aforementioned air supply channels is equipped with a flow valve.

9. A control method for a train fresh air oxygen supply system, characterized in that, Applied to the system according to any one of claims 1-8, the method comprises: Based on the actual number of passengers and the target oxygen concentration in each carriage, the required fresh air volume for the train is determined; based on the current speed of the train, the first air intake volume of the first air intake channel is determined. If the first air intake volume is less than the required fresh air volume, then the second air intake channel is opened.

10. The method according to claim 9, characterized in that, Also includes: If the first air intake volume is greater than or equal to the required fresh air volume, the second air intake channel is closed, and the opening of the opening adjustment valve of the first air intake channel is controlled according to the difference between the first air intake volume and the required fresh air volume. The opening adjustment valve is used to control the air intake volume entering the first air intake channel.

11. The method according to claim 9, characterized in that: The control of opening the second air intake channel includes: The difference between the required fresh air volume and the first air intake volume is used as the second air intake volume of the second air intake channel. The speed of the fan in the second air intake channel is controlled according to the second air intake volume.

12. The method according to claim 9, characterized in that: The determination of the required fresh air volume for the train based on the actual number of passengers and the target oxygen concentration in each carriage includes: The required fresh air volume for each carriage is determined based on the actual number of passengers in each carriage and the preset fresh air volume required per person per unit time. Based on the required fresh air volume for each carriage, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each carriage, the first regulating fresh air volume for the first regulating channel and the required fresh air volume for the second sub-channel are calculated respectively. The second regulating fresh air volume required for the second regulating channel is calculated based on the fresh air volume required for the second sub-channel and the air volume conversion efficiency of the membrane separator assembly. The air volume conversion efficiency = air volume of the second sub-channel / air volume entering the membrane separator assembly. The sum of the first and second adjusted fresh air volumes is taken as the required fresh air volume for the train.

13. The method according to claim 12, characterized in that, Also includes: The opening ratio of each outlet of the first proportional valve is determined based on the first and second adjusted fresh air volumes. And / or, based on the required fresh air volume for each car, the volume of the mixer, the outdoor oxygen concentration, the oxygen concentration in the second sub-channel, and the target oxygen concentration for each car, determine the opening ratio of each outlet of the second proportional valve and the third proportional valve.

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