Rail train air supply system

Abstract

An embodiment of the present invention relates to an air supply system for a rail train, which includes an air charging and discharging device, at least two sets of air springs, and an air charging and discharging control unit; the air charging and discharging device includes a high- and low-pressure integrated air tank, an internal and external circulation valve, and a first air compressor; if the air charging and discharging control unit detects that the air spring is compressed, the high-pressure area of ​​the high- and low-pressure integrated air tank is connected to the air path of the air spring, so that the gas in the high-pressure area of ​​the air tank is filled into the air spring; if the air charging and discharging control unit detects that the air spring is continuously pulled up, the low-pressure area of ​​the high- and low-pressure integrated air tank is connected to the air path of the air spring, so that the gas in the air spring is released to the low-pressure area of ​​the air tank; an internal and external circulation valve and a first air compressor are sequentially arranged between the low-pressure area of ​​the air tank and the high-pressure area of ​​the air tank, and the internal and external circulation valve is used to control the switching to the high- and low-pressure area connection state or the atmospheric connection state.

Description

Technical Field

[0001] The present invention relates to the technical field of rail vehicles, and in particular to an air supply system for a rail train. Background Art

[0002] The air supply system for rail trains provides high-pressure air for the train's air brakes, air springs, coupler opening and closing mechanisms, automatic door openers, and toilets. However, with the increasing electrification of rail trains, especially subway vehicles, air brakes are gradually being replaced by electromechanical brakes, coupler opening and closing mechanisms can be upgraded to electric couplers, and automatic door openers are also being replaced with electric ones. Therefore, toilets are no longer necessary in subway vehicles. Only the air springs require an air supply system.

[0003] The existing air supply system is equipped with an air compressor air supply system for each of the front and rear cars, and the two systems are redundant. The two air compressors jointly provide high-pressure air for the air springs of all vehicles in the train. The high-pressure gas must be transported from both ends to each vehicle. Each air compressor system is relatively large and suffers from significant pressure loss along the way. The air supply pipeline needs to be connected across vehicles, using a large number of pipes and joints, and the risk of air leakage is high. At the same time, because the air springs of each vehicle are far away from the air compressor, the air springs directly discharge gas into the atmosphere when deflated, resulting in a certain amount of gas waste. In addition, the continuous pumping of air from the atmosphere also puts great pressure on the filters and dry filters, shortening their lifespan. Therefore, there is an urgent need to improve the existing integrated open air supply system to overcome the above problems. Summary of the Invention

[0004] The purpose of the present invention is to address the defects of the existing technology and provide a rail train air supply system, which improves the overall open air supply method into a decentralized closed air supply method, reduces the use of workshop pipelines and joints, reduces the risk of air leakage, and improves gas utilization.

[0005] To achieve the above objectives, the present invention provides a rail train air supply system, comprising: an air charging and discharging device, at least two sets of air springs, and an air charging and discharging control unit; the air charging and discharging device comprises a high- and low-pressure integrated air tank, an internal and external circulation valve, and a first air compressor;

[0006] Each set of the air springs is connected to the air charging and discharging device via the corresponding air charging and discharging control unit. If the air charging and discharging control unit detects that the air spring is compressed, the high-pressure area of ​​the high- and low-pressure integrated air tank is connected to the air path of the air spring, so that the gas in the high-pressure area of ​​the air tank is filled into the air spring; if the air charging and discharging control unit detects that the air spring is continuously pulled up, the low-pressure area of ​​the high- and low-pressure integrated air tank is connected to the air path of the air spring, so that the gas in the air spring is released into the low-pressure area of ​​the air tank;

[0007] An internal and external circulation valve and a first air compressor are sequentially provided between the low-pressure area and the high-pressure area of ​​the gas tank. If the pressure value of the low-pressure area of ​​the gas tank is higher than the atmospheric pressure value, the internal and external circulation valve is switched to the high- and low-pressure area connection state, and the gas in the low-pressure area of ​​the gas tank is pumped into the high-pressure area of ​​the gas tank through the first air compressor; if the pressure value of the low-pressure area of ​​the gas tank is not higher than the atmospheric pressure value, and the total amount of gas in the gas tank is lower than a preset threshold, the internal and external circulation valve is switched to the atmospheric connection state, and air is pumped into the high-pressure area of ​​the gas tank through the first air compressor.

[0008] Furthermore, the inflation and deflation control unit is mechanically controlled or electrically controlled.

[0009] Furthermore, when the inflation and deflation control unit is a mechanical control method, the inflation and deflation control unit includes a height valve;

[0010] The height valve is used to detect the height change of the air spring and open the corresponding gas passage according to the height change.

[0011] Furthermore, when the inflation and deflation control unit is electronically controlled, the inflation and deflation control unit includes a controller, an inflation valve, an deflation valve, a breathing valve and a height sensor;

[0012] The air spring is connected to an air circuit of one end interface of the breathing valve, the other end interface of the breathing valve is respectively connected to an air circuit of one end interface of the inflation valve and an air circuit of one end interface of the deflation valve, the other end interface of the inflation valve is connected to an air circuit of a high-pressure area of ​​the gas tank, and the other end interface of the deflation valve is connected to an air circuit of a low-pressure area of ​​the gas tank, the height sensor is arranged on the vehicle body suspension, the controller is arranged in an under-vehicle equipment box, and is electrically connected to the inflation valve, the deflation valve, the breathing valve and the height sensor;

[0013] If the height sensor detects that the height of the air spring changes, the height value of the air spring is fed back to the controller; the controller controls the height of the air spring according to the height value of the air spring and a preset adjustment value.

[0014] Furthermore, the controller controls the height of the air spring according to the height value of the air spring and a preset adjustment value, specifically:

[0015] Determine the height value of the air spring and the size of the dead zone; if the height value of the air spring is lower than the dead zone, the controller opens the inflation valve and the breathing valve, while the deflation valve remains closed, so that the gas in the high-pressure area of ​​the air tank is sucked into the air spring through the breathing valve; if the height value of the air spring is higher than the dead zone, the controller opens the deflation valve and the breathing valve, while the inflation valve remains closed, so that the gas in the air spring is exhaled to the low-pressure area of ​​the air tank through the breathing valve; perform PID calculation on the height value of the air spring, and adjust the duty cycle of the breathing valve switch in real time through PWM until the height of the air spring falls within the dead zone.

[0016] Further, the height value of the air spring and the size of the dead zone are determined as follows:

[0017] The controller filters the height value and determines the height value of the air spring after filtering and the size of the dead zone.

[0018] Furthermore, the high-pressure area of ​​the gas tank is provided with a safety valve and a pressure switch;

[0019] If the pressure in the high-pressure area of ​​the gas tank reaches a preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor;

[0020] If the pressure in the high-pressure area of ​​the gas tank exceeds a preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor and opens the safety valve to discharge excess gas.

[0021] Furthermore, the inflation and deflation device further comprises a second air compressor;

[0022] The second air compressor is connected in parallel with the first air compressor, the air inlet of the second air compressor is connected to the internal and external circulation valve, and the air outlet of the second air compressor is connected to the high-pressure area of ​​the gas tank.

[0023] Furthermore, the inflation and deflation device further comprises a first one-way valve and a second one-way valve;

[0024] The first one-way valve is connected between the first air compressor and the high-pressure area of ​​the gas tank, and is used to cut off the flow of gas from the high-pressure area of ​​the gas tank to the low-pressure area of ​​the gas tank; the second one-way valve is connected between the second air compressor and the high-pressure area of ​​the gas tank, and is used to cut off the flow of gas from the high-pressure area of ​​the gas tank to the low-pressure area of ​​the gas tank.

[0025] Furthermore, the inflation and deflation device also includes a drying filter; one end of the drying filter is connected to the inlet end of the high-pressure area of ​​the gas tank, and the other end is connected to the first one-way valve and the second one-way valve, which is used to dry and filter the gas flowing into the first one-way valve or the second one-way valve.

[0026] An embodiment of the present invention provides a rail train air supply system that improves an overall open air supply method into a decentralized closed air supply method, thereby reducing the use of workshop pipelines and joints, reducing the risk of air leakage, and improving gas utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of a rail train air supply system provided by an embodiment of the present invention;

[0028] Figure 2 This is one of the principle diagrams of the rail train air supply system provided by an embodiment of the present invention;

[0029] Figure 3 The second schematic diagram of the rail train air supply system provided by an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the air spring height control principle of the rail train air supply system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only some, not all, of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0032] An embodiment of the present invention provides a rail train air supply system that improves an overall open air supply method into a decentralized closed air supply method, reducing the use of workshop pipelines and joints and reducing the risk of air leakage. In each decentralized closed air supply system, a charging and discharging device including a high- and low-pressure integrated gas tank, an internal and external circulation valve, and an air compressor is used. The high-pressure area of ​​the high- and low-pressure integrated gas tank meets the instantaneous air supply requirement, and the low-pressure area of ​​the gas tank can store low-pressure gas released by the air spring due to load reduction. The air compressor is responsible for pumping gas from the low-pressure area to the high-pressure area so that the gas can be internally recycled. The air compressor does not pump air from the atmosphere, and the pressure difference between the air compressor inlet and outlet is reduced, reducing the system's power input requirements. The internal and external circulation valves can be used to obtain gas from the outside when internal gas is insufficient, thereby improving gas utilization. The total displacement of the system is small, reducing the flow demand on the system air compressor, and extending the use of the drying filter. The use of redundant air compressors increases the stability of the system, and a one-way valve is provided at the outlet of each air compressor to prevent high-pressure gas from leaking from the redundant air compressor to the low-pressure area.

[0033] Figure 1This is a schematic diagram of the air supply system for a rail train provided in an embodiment of the present invention. The rail train in the present invention is illustrated by taking a 6-carriage subway as an example. The rail train is not limited here and can be a high-speed train, etc.

[0034] like Figure 1 As shown, the rail train air supply system includes an air charging and discharging device 1, at least two sets of air springs 2, and an air charging and discharging control unit 3; the air charging and discharging device 1 includes a high- and low-pressure integrated gas tank, an internal and external circulation valve 13 and a first air compressor 14, wherein the high- and low-pressure integrated gas tank includes a gas tank high-pressure area 11 and a gas tank low-pressure area 12.

[0035] The 6-carriage subway has a total of 6 cars, that is, one car is a car. The rail train air supply system is set up with one air supply system for each car, a total of 6 sets of distributed air supply systems, each air supply system is independent of each other. Figure 1 This is a schematic diagram of a gas supply system. When the entire gas supply system is used for the first time, sufficient high-pressure gas must be pumped into the system.

[0036] Each set of air springs 2 is connected to the charging and discharging device 1 through the corresponding charging and discharging control unit 3. If the charging and discharging control unit 3 detects that the air spring 2 is compressed, the high-pressure area 11 of the high- and low-pressure integrated gas tank is connected to the air path of the air spring 2, so that the gas in the high-pressure area 11 of the gas tank is filled into the air spring 2; if the charging and discharging control unit 3 detects that the air spring 2 is continuously pulled up, the low-pressure area 12 of the high- and low-pressure integrated gas tank is connected to the air path of the air spring 2, so that the gas in the air spring 2 is released to the low-pressure area 12 of the gas tank.

[0037] An internal and external circulation valve 13 and a first air compressor 14 are sequentially provided between the low-pressure area 12 of the gas tank and the high-pressure area 11 of the gas tank. If the pressure value of the low-pressure area 12 of the gas tank is higher than the atmospheric pressure value, the internal and external circulation valve 13 switches to a high- and low-pressure area connection state, and the gas in the low-pressure area 12 of the gas tank is pumped into the high-pressure area 11 of the gas tank through the first air compressor 14. If the pressure value of the low-pressure area 12 of the gas tank is not higher than the atmospheric pressure value, and the total amount of gas in the gas tank is lower than a preset threshold, the internal and external circulation valve 13 switches to an atmospheric connection state, and air is pumped into the high-pressure area 11 of the gas tank through the first air compressor 14. Among them, a filter 15 is provided at the entrance of the internal and external circulation valve 13, which is used to filter the external atmosphere and send it into the first air compressor 14.

[0038] In an optional solution, the inflation and deflation control unit 3 is a mechanical control method. Figure 2 This is one of the schematic diagrams of the rail train air supply system provided by the embodiment of the present invention, such as Figure 2 As shown, each vehicle includes two bogies, each bogie includes two sets of air springs 2, that is, each vehicle includes four sets of air springs 2, and the inflation and deflation control unit 3 includes a height valve 31, one end of the height valve 31 is connected to the air spring 2, and the other end is respectively connected to the high-pressure area 11 and the low-pressure area 12 of the gas tank.

[0039] The height valve 31 is used to detect the height change of the air spring 31 and open the corresponding gas passage according to the height change. Specifically, when the height valve 31 detects that the air spring 31 is continuously pulled up and the height increases, the air spring 31 is connected to the air path of the low-pressure area 12 of the gas tank, and the gas in the air spring 31 is released into the low-pressure area 12 of the gas tank until the air spring 31 returns to the preset height; when the height valve 31 detects that the air spring 31 is compressed and the height decreases, the air spring 31 is connected to the air path of the high-pressure area 11 of the gas tank, and the gas in the high-pressure area 11 of the gas tank is filled into the air spring 31 until the air spring 31 returns to the preset height.

[0040] In another optional solution, the gas charging and discharging control unit 3 is electronically controlled. Figure 3 The second schematic diagram of the rail train air supply system provided by the embodiment of the present invention is as follows: Figure 3 As shown, the inflation and deflation control unit 3 includes a controller 32 , an inflation valve 33 , a deflation valve 34 , a breathing valve 35 and a height sensor 36 .

[0041] The air spring 2 is connected to the air circuit of one end interface of the breathing valve 35, and the other end interface of the breathing valve 35 is respectively connected to the air circuits of one end interface of the inflation valve 33 and one end interface of the deflation valve 34. The other end interface of the inflation valve 33 is connected to the air circuit of the high-pressure area 11 of the gas tank, and the other end interface of the deflation valve 34 is connected to the air circuit of the low-pressure area 12 of the gas tank. The height sensor 36 is arranged on the vehicle body suspension, and the controller 32 is arranged in the equipment box under the vehicle, and is electrically connected to the inflation valve 33, the deflation valve 34, the breathing valve 35 and the height sensor 36.

[0042] If the height sensor 36 detects a change in the height of the air spring 2 , the height value of the air spring 2 is fed back to the controller 32 ; the controller 32 controls the height of the air spring according to the height value of the air spring 2 and a preset adjustment value.

[0043] in, Figure 4 The air spring height control principle diagram of the rail train air supply system provided by the embodiment of the present invention is as follows: Figure 4As shown, the height of the air spring 2 is controlled according to the height value of the air spring 2 and the preset adjustment value, specifically: the height value of the air spring 2 and the size of the dead zone are judged; if the height value of the air spring 2 is lower than the dead zone, the controller 32 opens the charging valve 33 and the breathing valve 35, while the air release valve 34 remains closed, so that the gas in the high-pressure area 11 of the air tank is sucked into the air spring 2 through the breathing valve 35; if the height value of the air spring 2 is higher than the dead zone, the controller 32 opens the air release valve 34 and the breathing valve 35, while the charging valve 33 remains closed, so that the gas in the air spring 2 is exhaled to the low-pressure area 12 of the air tank through the breathing valve 35; the height value of the air spring 2 is calculated by proportional integral differential (PID), and the duty cycle of the breathing valve 35 switch is adjusted in real time by pulse width modulation (PWM) until the height of the air spring 2 falls within the dead zone. Setting the dead zone as the preset adjustment value in the PID control can avoid oscillation caused by excessive adjustment.

[0044] In one possible embodiment, in order to avoid misjudgment of height caused by vibration, the height value of the air spring and the size of the dead zone are determined by: the controller 32 filters the height value and determines the height value of the air spring after filtering and the size of the dead zone. The filtering algorithm is shown in the following formula (1):

[0045]

[0046] Where Y(s) is the Laplace transform of the filter output, and X(s) is the Laplace transform of the filter input. The filter cutoff frequency can be adjusted by adjusting the value of the τ parameter.

[0047] In another optional solution, the high-pressure area 11 of the gas tank is provided with a safety valve and a pressure switch; if the pressure in the high-pressure area 11 of the gas tank reaches a preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor 14; if the pressure in the high-pressure area 11 of the gas tank exceeds the preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor 14 and opens the safety valve to discharge excess gas.

[0048] In another alternative, if Figure 2 As shown, the inflation / deflation device 1 further includes a second air compressor 16; the second air compressor 16 is connected in parallel with the first air compressor 14. The air inlet of the second air compressor 16 is connected to the internal / external circulation valve 13, and the air outlet of the second air compressor 16 is connected to the high-pressure area 11 of the gas tank. The second air compressor 16 is redundant to the first air compressor 14. When the first air compressor 14 fails, the second air compressor 16 is activated, thereby improving the reliability of the system.

[0049] In a further alternative, if Figure 2As shown, the gas charging and discharging device 1 also includes a first one-way valve 17 and a second one-way valve 18; the first one-way valve 17 is connected between the first air compressor 14 and the high-pressure area 11 of the gas tank, and is used to cut off the gas from the high-pressure area 11 of the gas tank to the low-pressure area 12 of the gas tank; the second one-way valve 18 is connected between the second air compressor 16 and the high-pressure area 11 of the gas tank, and is used to cut off the gas from the high-pressure area 11 of the gas tank to the low-pressure area 12 of the gas tank.

[0050] In a further alternative, such as Figure 2 As shown, the inflation and deflation device further includes a filter drier 19; one end of the filter drier 19 is connected to the inlet of the high-pressure zone 11 of the gas tank, and the other end is connected to the first one-way valve 17 and the second one-way valve 18. The filter drier 19 is used to dry and filter the gas flowing in through the first one-way valve or the second one-way valve. Because the gas inflated and deflated in the air spring 2 is internally circulated, the filter drier has a longer service life than a gas supply system using external circulation.

[0051] Professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0052] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0053] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rail train air supply system, characterized in that: The system includes an air charging and discharging device, at least two sets of air springs, and an air charging and discharging control unit; the air charging and discharging device includes a high- and low-pressure integrated gas tank, an internal and external circulation valve, and a first air compressor; Each set of the air springs is connected to the inflation and deflation device via the corresponding inflation and deflation control unit. If the inflation and deflation control unit detects that the air spring is compressed, the high-pressure area of ​​the high- and low-pressure integrated gas tank is connected to the air path of the air spring, so that the gas in the high-pressure area of ​​the gas tank is filled into the air spring. If the charging and discharging control unit detects that the air spring is continuously pulled up, the low-pressure area of ​​the high- and low-pressure integrated gas tank is connected to the air path of the air spring, so that the gas in the air spring is released into the low-pressure area of ​​the gas tank; An internal and external circulation valve and a first air compressor are sequentially provided between the low-pressure area and the high-pressure area of ​​the gas tank. If the pressure value of the low-pressure area of ​​the gas tank is higher than the atmospheric pressure value, the internal and external circulation valve is switched to a high- and low-pressure area connection state, and the gas in the low-pressure area of ​​the gas tank is pumped into the high-pressure area of ​​the gas tank through the first air compressor; if the pressure value of the low-pressure area of ​​the gas tank is not higher than the atmospheric pressure value, and the total amount of gas in the high- and low-pressure integrated gas tank is lower than a preset threshold, the internal and external circulation valve is switched to an atmospheric connection state, and air is pumped into the high-pressure area of ​​the gas tank through the first air compressor; The inflation and deflation control unit is electronically controlled and includes a controller, an inflation valve, a deflation valve, a breathing valve, and a height sensor; The air spring is connected to an air circuit of one end interface of the breathing valve, the other end interface of the breathing valve is respectively connected to an air circuit of one end interface of the inflation valve and an air circuit of one end interface of the deflation valve, the other end interface of the inflation valve is connected to an air circuit of a high-pressure area of ​​the gas tank, and the other end interface of the deflation valve is connected to an air circuit of a low-pressure area of ​​the gas tank, the height sensor is arranged on the vehicle body suspension, the controller is arranged in an under-vehicle equipment box, and is electrically connected to the inflation valve, the deflation valve, the breathing valve and the height sensor; If the height sensor detects that the height of the air spring changes, the height value of the air spring is fed back to the controller; the controller controls the height of the air spring according to the height value of the air spring and a preset adjustment value.

2. The rail train air supply system according to claim 1, characterized in that: The controller controls the height of the air spring according to the height value of the air spring and a preset adjustment value, specifically: Determine the height value of the air spring and the size of the dead zone; if the height value of the air spring is lower than the dead zone, the controller opens the inflation valve and the breathing valve, while keeping the deflation valve closed, so that the gas in the high-pressure area of ​​the gas tank is sucked into the air spring through the breathing valve; If the height value of the air spring is higher than the dead zone, the controller opens the deflation valve and the breathing valve, while the inflation valve remains closed, so that the gas in the air spring is exhaled to the low-pressure area of ​​the air tank through the breathing valve; the height value of the air spring is PID calculated, and the duty cycle of the breathing valve switch is adjusted in real time through PWM until the height of the air spring falls within the dead zone.

3. The rail train air supply system according to claim 2, characterized in that: Determine the height value of the air spring and the size of the dead zone, specifically: The controller filters the height value and determines the height value of the air spring after filtering and the size of the dead zone.

4. The rail train air supply system according to claim 1, characterized in that: The high-pressure area of ​​the gas tank is provided with a safety valve and a pressure switch; If the pressure in the high-pressure area of ​​the gas tank reaches a preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor; If the pressure in the high-pressure area of ​​the gas tank exceeds a preset pressure threshold, the pressure switch cuts off the power supply to the first air compressor and opens the safety valve to discharge excess gas.

5. The rail train air supply system according to claim 1, characterized in that: The inflation and deflation device further comprises a second air compressor; The second air compressor is connected in parallel with the first air compressor, the air inlet of the second air compressor is connected to the internal and external circulation valve, and the air outlet of the second air compressor is connected to the high-pressure area of ​​the gas tank.

6. The rail train air supply system according to claim 5, characterized in that: The inflation and deflation device further comprises a first one-way valve and a second one-way valve; The first one-way valve is connected between the first air compressor and the high-pressure area of ​​the gas tank, and is used to cut off the flow of gas from the high-pressure area of ​​the gas tank to the low-pressure area of ​​the gas tank; the second one-way valve is connected between the second air compressor and the high-pressure area of ​​the gas tank, and is used to cut off the flow of gas from the high-pressure area of ​​the gas tank to the low-pressure area of ​​the gas tank.

7. The rail train air supply system according to claim 6, characterized in that: The gas charging and discharging device further includes a drying filter; One end of the drying filter is connected to the inlet end of the high-pressure zone of the gas tank, and the other end is connected to the first one-way valve and the second one-way valve, and is used for drying and filtering the gas flowing into from the first one-way valve or the second one-way valve.

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