Air supply system for rail vehicle and control method thereof

Abstract

The application provides a kind of air supply system for rail vehicle and its control method, the system includes: air source device, cooling device and micro oil filter;Cooling device includes: first cooler, vehicle-mounted air conditioner, temperature sensor and control unit;Control unit is connected with vehicle-mounted air conditioner and temperature sensor respectively, first cooler is connected with vehicle-mounted air conditioner, temperature sensor, micro oil filter and air source device respectively;Control unit is used to receive temperature data collected by temperature sensor, and controls vehicle-mounted air conditioner to adjust cooling parameter value of cooling medium through first cooler according to temperature data;First cooler is used to cool compressed air discharged through air source device based on cooling parameter value, to condense oil vapor in compressed air into suspended oil;Micro oil filter is used to filter out suspended oil.The application can effectively improve the efficiency of compressed air cooling, and then can improve the effect of compressed air purification.

Description

Technical Field

[0001] This invention relates to the field of rail transit vehicle technology, and in particular to a ventilation system for rail vehicles and its control method. Background Technology

[0002] The air supply system is a key component that provides clean compressed air for rail transit vehicles. In addition to supplying the vehicle's air braking system, the compressed air it generates also supplies air-using equipment such as the pantograph lifting system, sand spreading system, and vehicle air spring system.

[0003] The high safety and reliability of rail transit vehicles place extremely high demands on the quality of compressed air (containing dust, water, and oil) supplied by the air supply system. Generally, compressed air must be filtered, dried, and purified. It can only be used after the cleanliness of the compressed air meets the ISO8573-1 2:2:2 standard. Among these, the purification of lubricating oil in the compressed air is a critical and the most difficult task.

[0004] The air supply system of rail transit vehicles typically consists of two air source units. Current technology generally involves installing multiple precision filters before or after the dryer of these units to reduce the oil content in the compressed air. However, the oil filtration effect is generally limited in high-temperature environments, such as summer. The main reason is that while precision filters can effectively filter and intercept suspended oil, they cannot effectively filter and intercept oil vapor. In high-temperature environments, a large portion of the lubricating oil in the compressed air exists in the form of oil vapor, so simply adding precision filters has limited effectiveness in filtering and intercepting lubricating oil.

[0005] One existing technology for a rail vehicle air supply device proposes incorporating a secondary cooling unit within the air supply device to further reduce the temperature of compressed air and condense oil vapor into suspended oil. However, this technology requires a separate secondary cooling unit within the air supply device. The air supply device itself has a compact structure and is installed under the vehicle, limiting internal installation space. Therefore, only a small-volume secondary cooling unit can be installed within the air supply device, resulting in unsatisfactory cooling effect on the compressed air. Summary of the Invention

[0006] To address at least one problem in the prior art, this invention proposes an air supply system and its control method for rail vehicles, which can effectively improve the efficiency of compressed air cooling and thus improve the effect of compressed air purification.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides an air supply system for rail vehicles, comprising: an air source device, a cooling device, and a micro oil filter;

[0009] The cooling device includes: a first cooler, an on-board air conditioner, a temperature sensor, and a control unit;

[0010] The control unit is connected to the vehicle air conditioner and the temperature sensor respectively, and the first cooler is connected to the vehicle air conditioner, the temperature sensor, the micro oil filter and the air source device respectively.

[0011] The control unit is used to receive temperature data collected by the temperature sensor and control the vehicle air conditioner to adjust the cooling parameter value of the cooling medium passing through the first cooler according to the temperature data;

[0012] The first cooler is used to cool the compressed air discharged via the air source device based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil.

[0013] The micro-oil filter is used to filter out the suspended oil.

[0014] Furthermore, the air source device includes: a safety valve, a pressure switch, an air filter, an air compressor, a second cooler, a steam-water separator, a precision condensing filter, a dryer, an overflow valve, and a pressure measuring point connected in sequence;

[0015] The safety valve is connected to the overflow valve, the pressure switch is connected to the pressure measuring point, and the dryer, overflow valve, and pressure measuring point are all connected to the first cooler.

[0016] Air enters the air filter, which is used to filter the air;

[0017] The air compressor is used to compress the filtered air;

[0018] The second cooler is used to cool compressed air and precipitate liquid water, liquid oil, and suspended oil.

[0019] The steam-water separator and the precision condenser filter are used to discharge the liquid water, liquid oil and part of the suspended oil;

[0020] The dryer is used to dry the cooled compressed air and discharge the dried compressed air to the first cooler.

[0021] Furthermore, the number of air source devices is two;

[0022] Both air source devices are connected to the first cooler.

[0023] Furthermore, the first cooler includes: a housing and a compressed air pipeline disposed within the housing;

[0024] One end of the compressed air pipeline is a compressed air inlet, and the other end is a compressed air outlet; one end of the housing is provided with a first through hole, and the other end of the housing is provided with a second through hole; the compressed air inlet extends to the outside of the housing through the first through hole, and the compressed air outlet extends to the outside of the housing through the second through hole;

[0025] One end of the housing is provided with a cooling medium outlet, and the other end of the housing is provided with a cooling medium inlet.

[0026] Furthermore, the side walls of the enclosure are provided with heat dissipation fins.

[0027] Furthermore, the position of the compressed air inlet is higher than the position of the compressed air outlet.

[0028] Furthermore, the opening pressure P of the overflow valve 溢 Satisfy: P0 - 100 kPa ≤ P 溢 ≤P0-20kPa, and P 溢 >P1;

[0029] Wherein, P0 is the disconnection pressure of the pressure switch, and P1 is the start-up pressure threshold of a wind source device.

[0030] Furthermore, the set value P of the safety valve 安 Satisfy: P0 + 50kPa ≤ P 安 ≤P0+150kPa;

[0031] Wherein, P0 is the disconnecting pressure of the pressure switch.

[0032] Secondly, the present invention also provides a control method for a ventilation system for rail vehicles, applied to the ventilation system, comprising:

[0033] The temperature sensor collects temperature data at the compressed air outlet of the first cooler.

[0034] The control unit receives temperature data collected by the temperature sensor and controls the vehicle air conditioner to adjust the cooling parameter value of the cooling medium passing through the first cooler according to the temperature data.

[0035] The first cooler cools the compressed air discharged through the air source device based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil;

[0036] The micro-oil filter removes the suspended oil.

[0037] Furthermore, the control method for the air supply system for rail vehicles further includes:

[0038] Air enters the air filter, which filters the air.

[0039] An air compressor compresses filtered air;

[0040] The second cooler cools the compressed air, causing liquid water, liquid oil, and suspended oil to precipitate out.

[0041] The steam-water separator and the precision condenser filter discharge the liquid water, liquid oil and some of the suspended oil;

[0042] The dryer dries the cooled compressed air and discharges the dried compressed air to the first cooler.

[0043] As can be seen from the above technical solution, the present invention provides an air supply system for rail vehicles and its control method. The system includes: an air source device, a cooling device, and a micro-oil filter; the cooling device includes: a first cooler, an on-board air conditioner, a temperature sensor, and a control unit; the control unit is connected to the on-board air conditioner and the temperature sensor respectively, and the first cooler is connected to the on-board air conditioner, the temperature sensor, the micro-oil filter, and the air source device respectively; the control unit is used to receive temperature data collected by the temperature sensor, and control the on-board air conditioner to adjust the cooling parameter value of the cooling medium passing through the first cooler according to the temperature data; the first cooler is used to cool the compressed air discharged through the air source device based on the cooling parameter value, so as to remove the impurities in the compressed air. Oil vapor condenses into suspended oil; the micro-oil filter is used to filter out the suspended oil, which can effectively improve the cooling efficiency of compressed air and thus improve the purification effect of compressed air; specifically, it can effectively solve the problem of rapid pressure drop in the main air duct of the train due to leakage caused by the failure of the safety valve to close or serious damage, which prevents the train braking system and other air-using equipment from operating normally; it can save economic costs; it can effectively prevent the accumulation of liquid oil that may condense and precipitate in the compressed air pipeline, thus avoiding affecting the oil content of the compressed air; it can avoid the adverse effects of low temperature compressed air on the performance of rubber seals; it can effectively reduce the temperature of compressed air and effectively reduce the oil content in the compressed air. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1This is a first structural block diagram of the air supply system for rail vehicles in an embodiment of the present invention;

[0046] Figure 2 This is a second structural block diagram of the air supply system for rail vehicles in an embodiment of the present invention;

[0047] Figure 3 This is a top view of the first cooler in an embodiment of the present invention;

[0048] Figure 4 This is a schematic diagram of the air supply system for rail vehicles in an embodiment of the present invention;

[0049] Figure 5 This is a flowchart illustrating the rectangular scene planar data processing method in an embodiment of the present invention.

[0050] Symbol Explanation

[0051] 1. Air source device;

[0052] 101. Air filter;

[0053] 102. Air compressor;

[0054] 103. Second cooler;

[0055] 104. Steam-water separator;

[0056] 105. Precision condensing filter;

[0057] 106. Dryer;

[0058] 107. Overflow valve;

[0059] 108. Safety valve;

[0060] 109. Pressure measuring points;

[0061] 110 pressure switch;

[0062] 2. Cooling device;

[0063] 201. First cooler;

[0064] 2011, Compressed air inlet;

[0065] 2012, Compressed air piping;

[0066] 2013, Box body;

[0067] 2014, Heat dissipation fins;

[0068] 2015, Compressed air outlet;

[0069] 2016, Cooling medium inlet;

[0070] 2017, Cooling medium outlet;

[0071] 202. Vehicle air conditioner;

[0072] 203. Temperature sensor;

[0073] 204. Control Unit;

[0074] 3. Micro-oil filter; Detailed Implementation

[0075] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0076] In existing technologies, the air outlet of the air source device is generally equipped with a safety valve. This safety valve is connected to the main air duct. When the pressure in the main air duct is too high, compressed air can be released to the outside through this safety valve to prevent damage to related equipment due to excessive pressure in the main air duct. However, existing technologies also have the problem that if the safety valve fails to close after release due to design or manufacturing defects or obstruction by foreign objects, the compressed air in the main air duct will be released to the outside through the safety valve. This could cause excessively low pressure in the main air duct, leading to traction blockage and inability to move trains. In severe cases, it could cause delays to multiple subway trains on the line.

[0077] The following examples illustrate this in detail.

[0078] To effectively improve the cooling efficiency of compressed air and thus enhance its purification effect, this embodiment provides an air supply system for rail vehicles, such as... Figure 1 As shown, the system specifically includes the following components:

[0079] The system comprises an air source device 1, a cooling device 2, and a micro-oil filter 3. The cooling device 2 includes a first cooler 201, a vehicle air conditioner 202, a temperature sensor 203, and a control unit 204. The control unit 204 is connected to the vehicle air conditioner 202 and the temperature sensor 203, respectively. The first cooler 201 is connected to the vehicle air conditioner 202, the temperature sensor 203, the micro-oil filter 3, and the air source device 1, respectively. The control unit 204 is used to receive temperature data collected by the temperature sensor 203 and control the vehicle air conditioner 202 to adjust the cooling parameter value of the cooling medium passing through the first cooler 201 according to the temperature data. The first cooler 201 is used to cool the compressed air discharged through the air source device 1 based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil. The micro-oil filter 3 is used to filter out the suspended oil.

[0080] Specifically, the cooling parameter values ​​may include: circulation speed and cooling medium temperature. The first cooler 201 may be installed at the bottom of the vehicle, close to the air source device 1; the vehicle air conditioner 202 may provide a low-temperature cooling medium for the first cooler 201; the vehicle air conditioner 202 may be installed on the top or bottom of the vehicle depending on the available space. The control unit 204 may be a controller.

[0081] Specifically, there can be two air source devices 1; both air source devices 1 are connected to the first cooler 201.

[0082] like Figure 2 As shown, in one embodiment of the present invention, the air source device 1 includes: a safety valve 108, a pressure switch 110, an air filter 101, an air compressor 102, a second cooler 103, a steam-water separator 104, a precision condensing filter 105, a dryer 106, an overflow valve 107, and a pressure measuring point 109 connected in sequence; the safety valve 108 is connected to the overflow valve 107, the pressure switch 110 is connected to the pressure measuring point 109, and the dryer 106, the overflow valve 107, and the pressure measuring point 109 are all connected to the first cooler 201. Air enters the air filter 101, which filters the air; the air compressor 102 compresses the filtered air; the second cooler 103 cools the compressed air, precipitating liquid water, liquid oil, and suspended oil; the steam-water separator 104 and the precision condenser filter 105 discharge the liquid water, liquid oil, and some suspended oil; the dryer 106 dries the cooled compressed air and discharges the dried compressed air to the first cooler 201.

[0083] Specifically, the steam-water separator 104 separates most of the liquid water and liquid oil that precipitate from the compressed air after it has been cooled by the second cooler 103, and discharges them to the outside. The precision condensing filter 105 removes the remaining liquid water, liquid oil, and most of the suspended oil. The pressure measuring point 109 is a cut-off pressure measuring point, from which the pressure at the outlet of the air source device 1 and the quality of the compressed air can be measured. The closing pressure of the pressure switch 110 can be P2-50 kPa, and the opening pressure is P0.

[0084] To facilitate the flow of liquid oil that may condense and precipitate within the compressed air pipeline 2012 along its inner wall to the micro-oil filter 3, where it is filtered and intercepted, effectively preventing the accumulation of liquid oil that may condense and precipitate within the compressed air pipeline 2012, such as... Figure 3 As shown, in one embodiment of the present invention, the first cooler 201 includes: a housing 2013 and a compressed air pipeline 2012 disposed within the housing; one end of the compressed air pipeline 2012 is a compressed air inlet 2011, and the other end is a compressed air outlet 2015; one end of the housing 2013 is provided with a first through hole, and the other end of the housing 2013 is provided with a second through hole; the compressed air inlet 2011 extends to the outside of the housing 2013 via the first through hole, and the compressed air outlet extends to the outside of the housing 2013 via the second through hole; one end of the housing 2013 is provided with a cooling medium outlet 2017, and the other end of the housing 2013 is provided with a cooling medium inlet 2016.

[0085] Specifically, the first cooler is placed approximately horizontally, the compressed air pipeline is placed approximately horizontally, and one end of the compressed air inlet 2011 should be higher than one end of the compressed air outlet 2015. The opening pressure P of the overflow valve 107 is... 溢 Satisfy: P0 - 100 kPa ≤ P 溢 ≤P0-20kPa, and P 溢 >P1; P0 is the disconnection pressure of the pressure switch 110, and P1 is the starting pressure threshold of a single air source device 1. The setting value P of the safety valve 108 安 Satisfy: P0 + 50kPa ≤ P 安 ≤P0+150kPa; where P0 is the disconnection pressure of the pressure switch 110. When the pressure in the main air duct is lower than P1, one air source device 1 starts; when it is lower than P2, both air source devices 1 start; and when P0 is reached, the air source device 1 stops.

[0086] Specifically, when the temperature of the compressed air at the outlet of the first cooler 201, as detected by the temperature sensor 203, exceeds a temperature threshold, the control unit 204 controls the vehicle air conditioner 202 to activate its cooling function. The cooling medium circulates through the first cooler 201, cooling the compressed air flowing through the compressed air pipeline 2012. When only one air source device 1 is operating, the control unit 204 adjusts the cooling capacity of the vehicle air conditioner 202 and the first cooler 201 in real time based on the temperature data collected by the temperature sensor 203, controlling the compressed air temperature at the outlet of the first cooler 201 within a preset temperature range. When both air source devices 1 are operating simultaneously, the control unit 204 adjusts the cooling capacity of the vehicle air conditioner 202 and the first cooler 201 in real time based on the temperature data collected by the temperature sensor 203. If, even at maximum cooling capacity, the compressed air temperature at the outlet of the first cooler 201 cannot be cooled to the preset temperature range, then the maximum cooling capacity operation is maintained.

[0087] In order to improve the heat dissipation effect of the first cooler 201, in one embodiment of the present invention, the side wall of the housing 2013 is provided with heat dissipation ribs 2014.

[0088] To address the problems existing in the prior art, this invention provides an application example of a ventilation system for rail vehicles, such as... Figure 4 As shown, in this application example, the air supply system for rail vehicles includes: two identical air source devices 1, a cooling device 2, and a micro-oil filter 3. A detailed description follows:

[0089] The two identical air source devices 1 are installed on two adjacent cars in the middle position of the train, or simultaneously on the same car in the middle position of the train.

[0090] The air source device 1 includes: an air filter 101, an air compressor 102, a second cooler 103, a steam-water separator 104, a precision condensing filter 105, a dryer 106, an overflow valve 107, a safety valve 108, a pressure measuring point 109, and a pressure switch 110.

[0091] The air filter 101 can filter the air entering the air compressor 102 from the outside, reducing the risk of wear and tear on the air compressor.

[0092] The air compressor 102 can compress air to meet the air pressure requirements of vehicles.

[0093] The second cooler 103 is a centrifugal air-cooled cooler coaxial with the motor, which can cool the compressed high-temperature air to within 15°C of the ambient temperature.

[0094] The steam-water separator 104 can separate most of the liquid water and liquid oil that precipitate out after the compressed air is cooled by the second cooler 103 from the compressed air and discharge them to the outside.

[0095] The precision condensing filter 105 can remove residual liquid water, liquid oil, and most of the suspended oil.

[0096] The dryer 106 can dry compressed air and remove most of the gaseous water contained in the compressed air.

[0097] The selection of the opening pressure of the overflow valve 107 should take into account the total air duct pressure required for the normal start of the air source device. Assuming that the vehicle requires air supply from the air source device, and the start / stop control pressure of the air source device is as follows: when the pressure in the total air duct is lower than P1, one air source device starts; when it is lower than P2, two air source devices start; and when it reaches P0, the air source device stops. Then, the opening pressure P of the overflow valve 107 is... 溢 It should satisfy: P0 - 100kPa ≤ P 溢 ≤P0-20kPa, and P 溢 >P1.

[0098] The set value P of safety valve 108 安 It should satisfy: P0 + 50kPa ≤ P 安 ≤P0+150kPa.

[0099] Pressure measuring point 109 is a cut-off pressure measuring point, from which the pressure and compressed air quality at the air outlet of the air source device can be tested.

[0100] The pressure switch 110 has a closing pressure of P2-50 kPa and an opening pressure of P0.

[0101] The cooling device 2 includes: a first cooler 201, a vehicle air conditioner 202, a temperature sensor 203, and a control unit 204.

[0102] The first cooler 201 includes: a compressed air inlet 2011, a compressed air pipeline 2012, a main cooler housing 2013, a cooler heat dissipation fin 2014, a compressed air outlet 2015, a cooling medium inlet 2016, and a cooling medium outlet 2017. The first cooler 201 is used to cool the compressed air flowing through the compressed air pipeline 2012, thereby condensing the oil vapor in the compressed air into suspended oil.

[0103] All parts of the compressed air pipeline 2012 should be on the same plane, and the position of the compressed air inlet 2011 should be slightly higher than the position of the compressed air outlet 2015, so as to facilitate the flow of liquid oil that may condense and precipitate in the compressed air pipeline 2012 along the inner wall of the compressed air pipeline 2012 to the micro oil filter 3, where it will be filtered and intercepted by the micro oil filter 3, effectively avoiding the problem of liquid oil that may condense and precipitate in the compressed air pipeline 2012 accumulating in the compressed air pipeline 2012.

[0104] The diameter of the compressed air pipeline 2012 should meet the total exhaust volume when both air source devices 1 are working simultaneously.

[0105] The first cooler 201 should be installed at the bottom of the vehicle, close to the two air source devices 1.

[0106] The temperature sensor 203 can monitor the temperature of the compressed air at the outlet of the first cooler 201 in real time and transmit the measured temperature data to the control unit.

[0107] The vehicle air conditioner 202 can provide a low-temperature cooling medium to the first cooler and turn the cooling function on or off according to the instructions of the control unit 204. When the cooling function is on, the circulation speed of the cooling medium through the first cooler 201 and the temperature of the cooling medium can be adjusted according to the instructions of the control unit 204, thereby adjusting the cooling capacity of the first cooler 201.

[0108] The vehicle air conditioner 202 can be installed on the top or bottom of the vehicle depending on the available space.

[0109] The control unit 204 can control the opening or closing of the cooling function of the air conditioning cooler 202 and the first cooler 201 based on the temperature data measured by the temperature sensor 203. When the cooling function is turned on, the control unit 204 can output commands to control the vehicle air conditioner 202 to adjust the circulation speed of the cooling medium through the first cooler 201 and the temperature of the cooling medium, thereby adjusting the cooling capacity of the first cooler 201.

[0110] The cooling capacity of the cooling device 2 is only required to meet the exhaust volume requirement when one air source device is working, and does not need to meet the total exhaust volume requirement when two air source devices are working at the same time. This is in line with the design condition that only one air source device works in most cases on the train, which can ensure the cooling effect and save the installation space and economic cost of the cooling device.

[0111] The micro-oil filter 3 can filter and intercept suspended oil and liquid oil in compressed air. The air volume that the micro-oil filter 3 can handle should be twice or more than the total exhaust volume when the two air source devices 1 are working simultaneously. Depending on the required oil content of the compressed air, one or two micro-oil filters 3 can be configured.

[0112] To effectively improve the cooling efficiency of compressed air and thus enhance its purification effect, this invention provides an embodiment of a control method for a rail vehicle air supply system, applied to the aforementioned air supply system, such as... Figure 5 As shown, the method includes:

[0113] Step 100: The temperature sensor collects temperature data at the compressed air outlet of the first cooler.

[0114] Step 200: The control unit receives the temperature data collected by the temperature sensor, and controls the vehicle air conditioner to adjust the cooling parameter value of the cooling medium passing through the first cooler according to the temperature data.

[0115] Step 300: The first cooler cools the compressed air discharged through the air source device based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil.

[0116] Step 400: The micro-oil filter removes the suspended oil.

[0117] In one embodiment of the present invention, the control method of the air supply system for rail vehicles further includes: Step 001: Air enters an air filter, and the air filter filters the air;

[0118] Step 002: The air compressor compresses the filtered air;

[0119] Step 003: The second cooler cools the compressed air, causing liquid water, liquid oil, and suspended oil to precipitate out;

[0120] Step 004: The steam-water separator and precision condenser filter discharge the liquid water, liquid oil and part of the suspended oil;

[0121] Step 005: The dryer dries the cooled compressed air and discharges the dried compressed air to the first cooler.

[0122] To further illustrate this solution, the present invention provides an application example of a control method for a ventilation system for rail vehicles, as described in detail below:

[0123] Step 11: When the air source device is working, the temperature sensor 203 monitors the compressed air temperature at the outlet 0 of the first cooler 201 in real time and transmits the temperature data to the control unit 204. When the compressed air temperature at the outlet of the first cooler 201 measured by the temperature sensor 203 is higher than 10°C, the control unit controls the vehicle air conditioner 202 to turn on the cooling function. The cooling medium will circulate through the first cooler 201 to cool the compressed air flowing through the compressed air pipeline 2012.

[0124] Step 12: When only one air source device is working, the control unit adjusts the cooling capacity of the vehicle air conditioner 202 and the first cooler 201 in real time according to the compressed air temperature data of the outlet of the first cooler 201 monitored by the temperature sensor 203, so as to control the compressed air temperature of the outlet of the first cooler 201 to be below 10℃ and above 0℃.

[0125] Step 13: When both air source devices are working at the same time, the control unit adjusts the cooling capacity of the vehicle air conditioner 202 and the first cooler 201 in real time based on the compressed air temperature data at the outlet of the first cooler 201 monitored by the temperature sensor 203. If the compressed air temperature at the outlet of the first cooler 201 cannot be cooled to below 10°C under the maximum cooling capacity, the maximum cooling capacity operation is maintained.

[0126] Step 14: If both of the following conditions are met, it indicates that safety valve 108 may be unable to close or is seriously damaged and leaking. It should be inspected and repaired after the train returns to the depot.

[0127] The air source device is in working condition, and the continuous working time of the air source device has reached a set threshold, which is generally 20 to 30 minutes.

[0128] The pressure in the main duct is higher than the opening pressure P of the overflow valve. 溢 The pressure is lower than the shutdown pressure P0 of the air source device.

[0129] As described above, the air supply system and control method for rail vehicles provided in this embodiment of the invention include an overflow valve installed between the safety valve at the air outlet of the air source device and the air outlet pipeline of the air source device. When the safety valve fails to close or is severely damaged and leaks, the pressure in the main air pipeline drops to the opening pressure P of the overflow valve. 溢Afterwards, the overflow valve will close, preventing compressed air in the main air duct from leaking to the outside through the safety valve. This effectively solves the problem of rapid pressure drop in the train's main air duct due to leakage caused by the safety valve failing to close or being severely damaged, which can lead to malfunctions in the train's braking system and other air-using equipment. It can also promptly detect leaks caused by the safety valve failing to close or being severely damaged. The two air source devices share a cooling device and a micro-oil filter downstream, effectively reducing the number of cooling devices and micro-oil filters, installation space, and economic costs. The cooling device 2 uses the onboard air conditioner 202 to provide the cooling medium for the first cooler 201, a mature and reliable technology with low economic costs. The cooling capacity of the cooling device 2 only needs to meet the exhaust volume requirement of one air source device operating, not the total exhaust volume requirement of two air source devices operating simultaneously. This aligns with the design condition that most trains operate with only one air source device, ensuring cooling effectiveness while saving on the volume, weight, installation space, and economic costs of the cooling device. All parts of the compressed air pipeline 2012 are on the same plane, and the compressed air inlet 2011 is slightly higher than the compressed air outlet 2015. This facilitates the flow of any liquid oil that may condense in the compressed air pipeline 2012 along its inner wall to the micro-oil filter 3, where it is filtered and intercepted. This effectively prevents the accumulation of liquid oil that may condense in the compressed air pipeline 2012, thus avoiding any impact on the oil content of the compressed air. The cooling device 2 uses the compressed air temperature data at the outlet of the first cooler 201, which is monitored in real time by the temperature sensor 203, to precisely control the cooling capacity. It can control the compressed air temperature at the outlet of the first cooler 201 to be between 0°C and 10°C, effectively reducing the compressed air temperature without dropping it below 0°C, thus avoiding the adverse effects of low-temperature compressed air on the performance of rubber seals. The cooling device 2 can effectively reduce the temperature of compressed air, condense the oil vapor in the compressed air into suspended oil, and filter and intercept it with the micro oil filter 3, which can effectively reduce the oil content of the compressed air.

[0130] Specific embodiments have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A ventilation system for rail vehicles, characterized in that, include: Air supply unit, cooling unit, and micro oil filter; The cooling device includes: a first cooler, a vehicle air conditioner, a temperature sensor, and a control unit; the number of air source devices is two; both air source devices are connected to the first cooler. The control unit is connected to the vehicle air conditioner and the temperature sensor respectively, and the first cooler is connected to the vehicle air conditioner, the temperature sensor, the micro oil filter and the air source device respectively. The control unit is used to receive temperature data collected by the temperature sensor and control the vehicle air conditioner to adjust the cooling parameter values ​​of the cooling medium passing through the first cooler according to the temperature data. The cooling parameter values ​​include: circulation speed and cooling medium temperature. The first cooler is used to cool the compressed air discharged via the air source device based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil. The micro-oil filter is used to filter out the suspended oil.

2. The air supply system for rail vehicles according to claim 1, characterized in that, The air source device includes: a safety valve, a pressure switch, an air filter, an air compressor, a second cooler, a steam-water separator, a precision condensing filter, a dryer, an overflow valve, and a pressure measuring point connected in sequence. The safety valve is connected to the overflow valve, the pressure switch is connected to the pressure measuring point, and the dryer, overflow valve, and pressure measuring point are all connected to the first cooler. Air enters the air filter, which is used to filter the air; The air compressor is used to compress the filtered air; The second cooler is used to cool compressed air and precipitate liquid water, liquid oil, and suspended oil. The steam-water separator and the precision condenser filter are used to discharge the liquid water, liquid oil and part of the suspended oil; The dryer is used to dry the cooled compressed air and discharge the dried compressed air to the first cooler.

3. The air supply system for rail vehicles according to claim 1, characterized in that, The first cooler includes: a housing and a compressed air pipeline disposed within the housing; One end of the compressed air pipeline is a compressed air inlet, and the other end is a compressed air outlet; one end of the housing is provided with a first through hole, and the other end of the housing is provided with a second through hole; the compressed air inlet extends to the outside of the housing through the first through hole, and the compressed air outlet extends to the outside of the housing through the second through hole; One end of the housing is provided with a cooling medium outlet, and the other end of the housing is provided with a cooling medium inlet.

4. The air supply system for rail vehicles according to claim 3, characterized in that, The side walls of the enclosure are equipped with heat dissipation ribs.

5. The air supply system for rail vehicles according to claim 3, characterized in that, The compressed air inlet is located higher than the compressed air outlet.

6. The air supply system for rail vehicles according to claim 2, characterized in that, The opening pressure P of the relief valve 溢 Satisfy: P0 - 100 kPa ≤ P 溢 ≤P0-20kPa, and P 溢 >P1; Wherein, P0 is the disconnection pressure of the pressure switch, and P1 is the start-up pressure threshold of a wind source device.

7. The air supply system for rail vehicles according to claim 2, characterized in that, The safety valve's set value P 安 Satisfy: P0 + 50kPa ≤ P 安 ≤P0+150kPa; Wherein, P0 is the disconnecting pressure of the pressure switch.

8. A control method for a ventilation system for rail vehicles, characterized in that, Applied to the air supply system as described in any one of claims 1 to 7, comprising: The temperature sensor collects temperature data at the compressed air outlet of the first cooler. The control unit receives temperature data collected by the temperature sensor and controls the vehicle air conditioner to adjust the cooling parameter value of the cooling medium passing through the first cooler according to the temperature data. The first cooler cools the compressed air discharged through the air source device based on the cooling parameter value, so as to condense the oil vapor in the compressed air into suspended oil; The micro-oil filter removes the suspended oil.

9. The control method for a ventilation system for rail vehicles according to claim 8, characterized in that, Also includes: Air enters the air filter, which filters the air. An air compressor compresses filtered air; The second cooler cools the compressed air, causing liquid water, liquid oil, and suspended oil to precipitate out. The steam-water separator and the precision condenser filter discharge the liquid water, liquid oil and some of the suspended oil; The dryer dries the cooled compressed air and discharges the dried compressed air to the first cooler.

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