Air quality monitoring device in railway train air source system

Abstract

The invention discloses an air quality monitoring device in a railway train air source system, and belongs to the technical field of air quality monitoring of train air source systems, the air quality monitoring device comprises a machine body, a sample gas filtering chamber, a dew point detection chamber and a sample gas detection chamber, and the sample gas filtering chamber, the dew point detection chamber and the sample gas detection chamber are all arranged in the machine body; a filter is arranged in the sample gas filtering chamber, a first sample gas inlet pipe extending out of the machine body is arranged on the filter, a filtering mechanism is arranged in the filter, and a filtering mechanism used for moving the filtering mechanism out of the filter is arranged outside the filter; quality change of compressed air can be monitored conveniently, air use safety and driving safety of an air pipeline system of a locomotive vehicle are guaranteed, the filtering mechanism is moved out of the filter through the moving-out mechanism, periodic cleaning of the filtering mechanism is facilitated, and the number of air leakage caused by long-time work is reduced. The filtering mechanism is seriously blocked, and subsequent water content detection is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of air quality monitoring of a train air source system, and in particular to an air quality monitoring device in an air source system of a railway train. Background Art

[0002] In the railway transportation industry, the braking system is a key component to ensure the safe operation of the locomotive. The reliability, stability and safety of the braking system are very important. If there are safety hazards in the braking system, it will pose a serious threat to the safe operation of the locomotive. The function of the air source system is to provide high-quality compressed air with the specified pressure for the locomotive braking system, auxiliary air system and vehicles. Therefore, the reliability and air supply capacity of the air source system will directly affect the performance of the locomotive braking system and the availability of the locomotive itself.

[0003] The main function of the locomotive air source system is to provide clean and dry compressed air for locomotive vehicles. Since compressed air is mainly used for safety equipment such as braking systems, pantographs, sand spreading, bagpipes, air springs, etc., the stable operation of the locomotive air source system is crucial.

[0004] However, after the beginning of summer every year, many locomotive depots in southern my country will experience air source system failures. The most common one is the emulsification of air compressor oil, which reduces the cooling, sealing, lubrication and noise reduction functions of the air compressor oil. In addition, after the desiccant installed in the dryer fails, the humidity, oil content and particle size of the compressed air do not meet the standards, which in turn leads to air pipeline corrosion, rubber seal failure, valve component blockage and other problems, which also seriously affect the air safety and driving safety of the air pipeline system of locomotives and vehicles. In order to monitor the quality changes of compressed air and ensure the air safety and driving safety of the air pipeline system of locomotives and vehicles, it is necessary to detect the water content and particulate matter in the air. When detecting the water content in the air, it is necessary to filter the oil and particulate matter in the air. During the long-term detection operation, the filter element inside the filter is prone to blockage, affecting the subsequent water content detection effect. Therefore, it is very necessary to design an air quality monitoring device in the air source system of railway trains. Summary of the invention

[0005] The object of the present invention is to provide an air quality monitoring device in a railway train air source system to solve the problems raised in the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an air quality monitoring device in a railway train air source system, comprising a body, a sample gas filter chamber, a dew point detection chamber and a sample gas detection chamber, wherein the sample gas filter chamber, the dew point detection chamber and the sample gas detection chamber are all arranged in the body;

[0007] A filter is provided in the sample gas filter chamber, a sample gas inlet pipe extending out of the body is provided on the filter, a filtering mechanism is provided in the filter, and a filtering mechanism for moving the filtering mechanism out of the filter is provided outside the filter;

[0008] The dew point detection chamber is arranged at one side of the sample gas filter chamber and is connected to the filter. A dew point measurement chamber is provided in the dew point detection chamber, and a dew point transmitter is provided in the dew point measurement chamber.

[0009] The sample gas detection chamber is provided with a particle detection chamber 1, a condensation chamber and a particle detection chamber 2, the particle detection chamber 1 is provided with a sample gas inlet pipe 2 extending out of the body, the particle detection chamber 1 is provided with an isolated measurement chamber, and the isolated measurement chamber is provided with a particle laser sensor 1;

[0010] A condensation chamber is provided in the condensation chamber, the condensation chamber is connected with the isolated measurement chamber through a first air guide pipe, and a condensation plate is provided in the condensation chamber;

[0011] A particle measurement chamber is provided in the second particle detection chamber, the particle measurement chamber is connected to the condensation chamber through a second air duct, and a second particle laser sensor is provided in the particle measurement chamber;

[0012] An exhaust mechanism is provided between the dew point detection chamber and the second particle detection chamber.

[0013] In a further embodiment, the filtering mechanism comprises a particle filter screen 1, a particle filter screen 2 and an oil filter screen which are sequentially arranged in the filter;

[0014] The filter is provided with a fixing seat at the top and the bottom, the fixing seat at the bottom is provided with a movable hole, and a sealing seat fixedly connected with the particle filter screen 1, the particle filter screen 2 and the oil filter screen is provided in the movable hole.

[0015] In a further embodiment, the removal mechanism includes a support plate arranged at the bottom of the sealing seat, screws are provided at both ends of the support plate, a moving block connected to the support plate is threadedly connected to the screw, and a driving mechanism is provided under the filter for driving the moving block to move on the screw and thereby driving the support plate to move up and down.

[0016] In a further embodiment, the driving mechanism includes a driving motor arranged below the filter, the output end of the driving motor is connected to the driving wheel, the lower fixed sleeve of the screw rod is provided with a driven wheel, a transmission wheel is installed between the driving wheel and the adjacent driven wheel through a transmission shaft, and the transmission wheel is meshed with the adjacent driving wheel and driven wheel.

[0017] In a further embodiment, the exhaust mechanism includes a manifold arranged between the dew point detection chamber and the particle matter detection chamber 2 and extending out of the body, the dew point measurement chamber and the particle matter measurement chamber are both connected to the manifold through a guide pipe, an air pump is provided on the guide pipe, a flow limiting hole is provided in the manifold, and a pressure maintaining valve is provided on the manifold at the outlet end of the flow limiting hole.

[0018] In a further embodiment, an adsorption plate is provided on the inner wall of the isolated measuring cavity, and a steam inlet pipe and a steam outlet pipe extending into the isolated measuring cavity are provided on the outer side of the machine body.

[0019] In a further embodiment, a heat dissipation chamber is provided on one side of the condensation chamber, a coolant storage tank is provided in the heat dissipation chamber, a heat dissipation fan is provided above the coolant storage tank, an infusion tube and a return tube connected to the condensation plate are respectively provided on the coolant storage tank, and a liquid transfer pump is provided on the infusion tube and the return tube.

[0020] In a further embodiment, an oil drain channel is provided in the condensation chamber below the condensation plate, and an oil storage box matching the oil drain channel is provided at the bottom of the condensation chamber.

[0021] In a further embodiment, a pressure block is provided on the top of the support plate, and a pressure sensor located above the pressure block is provided on a fixing seat located at the bottom of the filter.

[0022] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: one path of sample gas to be detected enters the filter through the sample gas inlet pipe 1, the oil substances and particulate matter in the sample gas are filtered through the filtering mechanism, the filtered sample gas enters the dew point measuring cavity in the dew point detection chamber, the dew point is detected through the dew point transmitter, the detected sample gas is discharged through the exhaust mechanism, the other path of sample gas to be detected enters the isolated measuring cavity in the particle detection chamber 1 through the sample gas inlet pipe 2, the total amount of particulate matter is detected through the particle laser sensor 1, the sample gas after the total amount of particulate matter is detected enters the condensation cavity in the condensation chamber, and is discharged through the condensation mechanism. The plate condenses the oil substances in the sample gas, and the sample gas after condensation and oil removal enters the particle measurement cavity in the particle detection chamber 2, and the residual dust particle content is detected by the particle laser sensor 2. The sample gas after detection is discharged through the exhaust mechanism. By detecting the dew point and particle content in the sample gas, it is convenient to monitor the quality changes of compressed air, ensure the air safety of the air pipeline system of locomotives and vehicles and the driving safety, and remove the filter mechanism from the filter through the removal mechanism, so as to facilitate the periodic cleaning of the filter mechanism, reduce the serious consequences of filter mechanism blockage after long-term work, and facilitate the subsequent water content detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the internal structure of the machine body of the present invention;

[0024] Figure 2 It is a schematic diagram of the external structure of the machine body of the present invention;

[0025] Figure 3 is a cross-sectional view of the interior of the body of the present invention;

[0026] Figure 4 It is a schematic diagram of the installation structure of the replacement mechanism of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the sample gas detection chamber of the present invention;

[0028] The accompanying drawings are marked as follows: body 1, sample gas filter chamber 2, fixing seat 3, filter 4, sample gas inlet pipe 1 5, dew point detection chamber 6, dew point measurement chamber 7, dew point transmitter 8, guide tube 9, air pump 10, manifold 11, flow limiting hole 12, pressure maintaining valve 13, sample gas detection chamber 14, particle detection chamber 1 15, isolated measurement chamber 16, sample gas inlet pipe 2 17, particle laser sensor 1 18, adsorption plate 19, steam inlet pipe 20, steam outlet pipe 21, condensation chamber 22, condensation chamber 23, first air guide pipe 24, condensation plate 25, first Second air duct 26, oil discharge channel 27, oil storage box 28, particle detection chamber 29, particle measurement chamber 30, particle laser sensor 2 31, heat dissipation chamber 32, coolant storage tank 33, heat dissipation fan 34, infusion tube 35, reflux pipe 36, liquid guide pump 37, particle filter 1 38, particle filter 2 39, oil filter 40, sealing seat 41, support plate 42, screw 43, moving block 44, drive motor 45, driving wheel 46, transmission shaft 47, transmission wheel 48, driven wheel 49, pressure block 50, pressure sensor 51. DETAILED DESCRIPTION

[0029] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0030] See also Figure 1-Figure 5 The present invention provides a technical solution: an air quality monitoring device in a railway train air source system, comprising a body 1, a sample gas filter chamber 2, a dew point detection chamber 6 and a sample gas detection chamber 14, wherein the sample gas filter chamber 2, the dew point detection chamber 6 and the sample gas detection chamber 14 are all arranged in the body 1;

[0031] A filter 4 is provided in the sample gas filter chamber 2, a sample gas inlet pipe 5 extending out of the body 1 is provided on the filter 4, a filtering mechanism is provided in the filter 4, and a filtering mechanism for moving the filtering mechanism out of the filter 4 is provided outside the filter 4;

[0032] The dew point detection chamber 6 is arranged at one side of the sample gas filter chamber 2 and is connected to the filter 4. A dew point measurement chamber 7 is provided in the dew point detection chamber 6, and a dew point transmitter 8 is provided in the dew point measurement chamber 7.

[0033] The sample gas detection chamber 14 is provided with a particle detection chamber 15, a condensation chamber 22 and a particle detection chamber 29. The particle detection chamber 15 is provided with a sample gas inlet pipe 2 17 extending out of the body 1. The particle detection chamber 15 is provided with an isolated measurement chamber 16. The isolated measurement chamber 16 is provided with a particle laser sensor 18.

[0034] A condensation chamber 23 is provided in the condensation chamber 22, and the condensation chamber 23 is connected to the isolated measurement chamber 16 through a first air guide pipe 24, and a condensation plate 25 is provided in the condensation chamber 23;

[0035] A particle measuring chamber 30 is provided in the second particle detection chamber 29, and the particle measuring chamber 30 is connected to the condensation chamber 23 through the second air duct 26. A particle laser sensor 31 is provided in the particle measuring chamber 30.

[0036] An exhaust mechanism is provided between the dew point detection chamber 6 and the particle detection chamber 29 .

[0037] Through the above technical scheme, one path of the sample gas to be tested enters the filter 4 through the sample gas inlet pipe 15, and the oil substances and particulate matter in the sample gas are filtered by the filtering mechanism. The filtered sample gas enters the dew point measurement cavity 7 in the dew point detection chamber 6, and the dew point is detected by the dew point transmitter 8. The sample gas after detection is discharged through the exhaust mechanism, and the other path of the sample gas to be tested enters the isolated measurement cavity 16 in the particle detection chamber 15 through the sample gas inlet pipe 217, and the total amount of particulate matter is detected by the particle laser sensor 18. After the total amount of particulate matter is detected, the sample gas enters the condensation cavity 23 in the condensation chamber 22, and passes through the condensation plate 2 5. The oil substances in the sample gas are condensed, and the sample gas after condensation and deoiling enters the particle measurement cavity 30 in the particle detection chamber 29. The residual dust particle content is detected by the particle laser sensor 2 31. The sample gas after detection is discharged through the exhaust mechanism. By detecting the dew point and particle content in the sample gas, it is convenient to monitor the quality change of compressed air, ensure the air safety of the air pipeline system of the locomotive and vehicle and the driving safety, and remove the filter mechanism from the filter 4 through the removal mechanism, so as to facilitate the periodic cleaning of the filter mechanism, reduce the serious consequences of the filter mechanism being blocked after long-term work, and facilitate the subsequent water content detection.

[0038] In a further embodiment, the filtering mechanism includes a particle filter 1 38, a particle filter 2 39 and an oil filter 40 which are sequentially arranged in the filter 4;

[0039] The filter 4 is provided with a fixing seat 3 at the top and the bottom. The fixing seat 3 at the bottom is provided with a movable hole. A sealing seat 41 fixedly connected to the particle filter screen 1 38 , the particle filter screen 2 39 and the oil filter screen 40 is provided in the movable hole.

[0040] Through the above technical solution, the oil substances and particulate matter in the sample gas are filtered through the particle filter 1 38, the particle filter 2 39 and the oil filter 40, and the particle filter 1 38, the particle filter 2 39 and the oil filter 40 are installed and supported by the sealing seat 41.

[0041] In a further embodiment, the removal mechanism includes a support plate 42 arranged at the bottom of the sealing seat 41, screws 43 are provided at both ends of the support plate 42, and a moving block 44 connected to the support plate 42 is threadedly connected to the screw 43. A driving mechanism is provided under the filter 4 to drive the moving block 44 to move on the screw 43 and thereby drive the support plate 42 to move up and down.

[0042] Through the above technical solution, the driving mechanism drives the moving block 44 to move on the screw 43, thereby driving the support plate 42 to move up and down, and then conveniently driving the particle filter 1 38, the particle filter 2 39 and the oil filter 40 to move in or out of the filter 4 through the sealing seat 41.

[0043] In a further embodiment, the driving mechanism includes a driving motor 45 arranged below the filter 4, the output end of the driving motor 45 is connected to the driving wheel 46, a driven wheel 49 is provided on the lower fixed sleeve of the screw 43, and a transmission wheel 48 is installed between the driving wheel 46 and the adjacent driven wheel 49 through a transmission shaft 47, and the transmission wheel 48 is meshed with the adjacent driving wheel 46 and the driven wheel 49.

[0044] Through the above technical solution, the driving motor 45 drives the driving wheel 46 to rotate, which in turn drives the transmission wheel 48 to rotate on the transmission shaft 47, and then drives the screw rod 43 to rotate through the driven wheel 49.

[0045] In a further embodiment, the exhaust mechanism includes a manifold 11 which is arranged between the dew point detection chamber 6 and the particle matter detection chamber 29 and extends out of the body 1. The dew point measurement chamber 7 and the particle matter measurement chamber 30 are both connected to the manifold 11 through a guide pipe 9. An air pump 10 is provided on the guide pipe 9. A flow limiting hole 12 is provided in the manifold 11. A pressure maintaining valve 13 is provided on the manifold 11 at the outlet end of the flow limiting hole 12.

[0046] Through the above technical solution, the two sample gases after detection are merged into the confluence pipe 11 through the cooperation of the guide pipe 9 and the gas pump 10. The merged sample gas passes through the flow limiting hole 12, and the flow rate of the front-end sample gas is limited by the flow limiting hole 12. The sample gas is finally discharged through the pressure maintaining valve 13.

[0047] In a further embodiment, an adsorption plate 19 is provided on the inner wall of the isolated measuring cavity 16 , and a steam inlet pipe 20 and a steam outlet pipe 21 extending into the isolated measuring cavity 16 are provided on the outer side of the machine body 1 .

[0048] Through the above technical solution, the steam inlet pipe 20 and the steam outlet pipe 21 cooperate to regularly heat the adsorption plate 19 in the isolated measurement chamber 16 with steam, and the pollutants adsorbed by the adsorption plate 19 are desorbed by high temperature.

[0049] In a further embodiment, a heat dissipation chamber 32 is provided on one side of the condensation chamber 22, a coolant storage tank 33 is provided in the heat dissipation chamber 32, a heat dissipation fan 34 is provided above the coolant storage tank 33, and an infusion tube 35 and a return tube 36 connected to the condensation plate 25 are respectively provided on the coolant storage tank 33, and a liquid guide pump 37 is provided on the infusion tube 35 and the return tube 36.

[0050] Through the above technical scheme, the coolant stored in the coolant tank 33 is transported to the condensation plate 25 through the cooperation of the infusion tube 35 and the liquid pump 37, and the coolant in the condensation plate 25 is refluxed to the coolant tank 33 through the cooperation of the reflux tube 36 and the liquid pump 37. The heat dissipation fan 34 cools down the coolant with increased temperature in the coolant tank 33, so as to facilitate the condensation effect of the condensation plate 25 in the condensation chamber 22.

[0051] In a further embodiment, an oil drain channel 27 is provided in the condensation chamber 23 below the condensation plate 25 , and an oil storage box 28 matching the oil drain channel 27 is provided at the bottom of the condensation chamber 22 .

[0052] Through the above technical solution, the condensed liquid oil flows into the oil discharge channel 27 under the influence of gravity, and then flows into the oil storage box 28, wherein the condensation plate 25 is arranged obliquely.

[0053] In a further embodiment, a pressure block 50 is provided on the top of the support plate 42 , and a pressure sensor 51 located above the pressure block 50 is provided on the fixing seat 3 located at the bottom of the filter 4 .

[0054] Through the above technical solution, when the support plate 42 moves upward to extend the particulate filter 1 38, the particulate filter 2 39 and the oil filter 40 into the filter 4, the pressing block 50 gradually approaches the pressure sensor 51 and squeezes the pressure sensor 51. When the pressure sensor 51 senses the pressure, the support plate 42 stops moving upward.

[0055] Working principle: One path of the sample gas to be tested enters the filter 4 through the sample gas inlet pipe 15, and the oil substances and particulate matter in the sample gas are filtered through the particle filter 1 38, the particle filter 2 39 and the oil filter 40. The filtered sample gas enters the dew point measurement cavity 7 in the dew point detection chamber 6, and the dew point is detected by the dew point transmitter 8. The sample gas after detection passes through the guide pipe 9 and the air pump 10 to enter the manifold 11. The other path of the sample gas to be detected enters the isolated measurement cavity 16 in the particle detection chamber 15 through the sample gas inlet pipe 2 17, and passes through the particle filter 18. The particle laser sensor 18 detects the total amount of particulate matter. After the total amount of particulate matter is detected, the sample gas enters the condensation chamber 23 in the condensation chamber 22, and the oil substances in the sample gas are condensed through the condensation plate 25. During the condensation process, the coolant stored in the coolant storage tank 33 is transported to the condensation plate 25 through the infusion pipe 35 in cooperation with the liquid pump 37, and the coolant in the condensation plate 25 is refluxed to the coolant storage tank 33 through the reflux pipe 36 in cooperation with the liquid pump 37. The heat dissipation fan 34 cools down the coolant with a raised temperature in the coolant storage tank 33, and the condensation The deoiled sample gas enters the particle measurement chamber 30 in the particle detection chamber 29, and the residual dust particle content is detected by the particle laser sensor 2 31. The detected sample gas passes through the guide pipe 9 and the air pump 10 to enter the confluence pipe 11. The merged sample gas passes through the flow limiting hole 12, and the front sample gas flow is limited by the flow limiting hole 12. The sample gas is finally discharged through the pressure maintaining valve 13. By detecting the dew point and particle content in the sample gas, it is convenient to monitor the quality changes of compressed air and ensure the safety and quality of the air pipeline system of locomotives and vehicles. Driving safety, the driving motor 45 drives the driving wheel 46 to rotate, and then drives the transmission wheel 48 to rotate on the transmission shaft 47, and then drives the screw 43 to rotate through the driven wheel 49, and then drives the moving block 44 to move on the screw 43, and then drives the support plate 42 to move up and down, and then drives the particle filter 1 38, the particle filter 2 39 and the oil filter 40 to move into or out of the filter 4 through the sealing seat 41, so as to facilitate the periodic cleaning of the filter mechanism, reduce the consequences of serious blockage of the filter mechanism after long-term work, and facilitate the subsequent water content detection.

[0056] The preferred specific embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above specific embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. An air quality monitoring device in a railway train air source system, characterized in that: It comprises a machine body (1), a sample gas filter chamber (2), a dew point detection chamber (6) and a sample gas detection chamber (14), wherein the sample gas filter chamber (2), the dew point detection chamber (6) and the sample gas detection chamber (14) are all arranged in the machine body (1); A filter (4) is provided in the sample gas filter chamber (2), a sample gas inlet pipe (5) extending out of the body (1) is provided on the filter (4), a filtering mechanism is provided in the filter (4), and a filtering mechanism for moving the filtering mechanism out of the filter (4) is provided outside the filter (4); The dew point detection chamber (6) is arranged on one side of the sample gas filter chamber (2) and is connected to the filter (4); a dew point measurement chamber (7) is provided in the dew point detection chamber (6); and a dew point transmitter (8) is provided in the dew point measurement chamber (7); The sample gas detection chamber (14) is provided with a particle detection chamber 1 (15), a condensation chamber (22) and a particle detection chamber 2 (29); the particle detection chamber 1 (15) is provided with a sample gas inlet pipe 2 (17) extending out of the body (1); the particle detection chamber 1 (15) is provided with an isolated measurement chamber (16); and the isolated measurement chamber (16) is provided with a particle laser sensor 1 (18); A condensation cavity (23) is provided in the condensation chamber (22), the condensation cavity (23) is connected to the isolated measurement cavity (16) through a first air guide pipe (24), and a condensation plate (25) is provided in the condensation cavity (23); A particle measurement chamber (30) is provided in the second particle detection chamber (29), the particle measurement chamber (30) is connected to the condensation chamber (23) via a second air duct (26), and a particle laser sensor (31) is provided in the particle measurement chamber (30); An exhaust mechanism is provided between the dew point detection chamber (6) and the second particle detection chamber (29).

2. The air quality monitoring device in the air source system of a railway train according to claim 1, characterized in that: The filtering mechanism comprises a particle filter screen 1 (38), a particle filter screen 2 (39) and an oil filter screen (40) which are sequentially arranged in the filter (4); The filter (4) is provided with a fixed seat (3) at the top and the bottom, and a movable hole is provided on the fixed seat (3) at the bottom, and a sealing seat (41) fixedly connected to the particle filter screen 1 (38), the particle filter screen 2 (39) and the oil filter screen (40) is provided in the movable hole.

3. The air quality monitoring device in the air source system of a railway train according to claim 2, characterized in that: The removal mechanism comprises a support plate (42) arranged at the bottom of the sealing seat (41), screw rods (43) are arranged at both ends of the support plate (42), a moving block (44) connected to the support plate (42) is threadedly connected to the screw rod (43), and a driving mechanism is arranged below the filter (4) for driving the moving block (44) to move on the screw rod (43) and thereby driving the support plate (42) to move up and down.

4. The air quality monitoring device in the air source system of a railway train according to claim 3, characterized in that: The driving mechanism comprises a driving motor (45) arranged below the filter (4); the output end of the driving motor (45) is connected to a driving wheel (46); a driven wheel (49) is fixedly sleeved at the lower part of the screw rod (43); a transmission wheel (48) is installed between the driving wheel (46) and the adjacent driven wheel (49) via a transmission shaft (47); and the transmission wheel (48) is meshed with the adjacent driving wheel (46) and the driven wheel (49).

5. The air quality monitoring device in the air source system of a railway train according to claim 1, characterized in that: The exhaust mechanism comprises a manifold (11) arranged between the dew point detection chamber (6) and the second particle detection chamber (29) and extending out of the machine body (1); the dew point measurement chamber (7) and the particle measurement chamber (30) are both connected to the manifold (11) through a guide pipe (9); an air pump (10) is arranged on the guide pipe (9); a flow limiting hole (12) is arranged in the manifold (11); and a pressure maintaining valve (13) is arranged on the manifold (11) at the gas outlet end of the flow limiting hole (12).

6. The air quality monitoring device in the air source system of a railway train according to claim 1, characterized in that: The inner wall of the isolated measuring chamber (16) is provided with an adsorption plate (19), and the outer side of the machine body (1) is provided with a steam inlet pipe (20) and a steam outlet pipe (21) extending into the isolated measuring chamber (16).

7. The air quality monitoring device in the air source system of a railway train according to claim 1, characterized in that: A heat dissipation chamber (32) is provided on one side of the condensation chamber (22), a coolant storage tank (33) is provided in the heat dissipation chamber (32), a heat dissipation fan (34) is provided above the coolant storage tank (33), and a liquid infusion pipe (35) and a return pipe (36) connected to the condensation plate (25) are provided on the coolant storage tank (33), and a liquid transfer pump (37) is provided on both the liquid infusion pipe (35) and the return pipe (36).

8. The air quality monitoring device in a railway train air source system according to claim 1, characterized in that: An oil drain channel (27) is provided in the condensation cavity (23) below the condensation plate (25), and an oil storage box (28) matching the oil drain channel (27) is provided at the bottom of the condensation chamber (22).

9. The air quality monitoring device in the air source system of a railway train according to claim 3, characterized in that: A pressure block (50) is provided on the top of the support plate (42), and a pressure sensor (51) located above the pressure block (50) is provided on the fixing seat (3) located at the bottom of the filter (4).

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