Testing equipment for air compressor dryer unit of maglev train

Abstract

The utility model provides a testing device for a dryer unit of an air compressor of a maglev train, which comprises a first air storage tank connected to an air source output interface of a to-be-tested dryer and used for receiving dry air discharged from the air source output interface; one end of the second air storage tank is connected to an air source input interface of the tested dryer, the other end of the second air storage tank is connected to an air inlet valve for introducing dry air and a humidifying and atomizing nozzle valve for introducing wet air, and the air inlet valve and the humidifying and atomizing nozzle valve are arranged in parallel; the tested dryer is provided with a water vapor discharge interface; and after the humidification atomization nozzle valve introduces wet gas into the second gas storage tank, the gas inlet valve introduces dry gas into the second gas storage tank. And the working environment of the dryer under real working conditions can be simulated. And whether the dryer can normally complete adsorption and regeneration processes and discharge moisture under the condition that the adsorbed moisture is nearly saturated is verified, so that the performance of the dryer is more accurately and comprehensively tested, and the test reliability is improved.

Description

Technical Field

[0001] This utility model relates to a testing device for an air compressor dryer unit of a maglev train. Background Technology

[0002] Maglev trains rely on air compressors to supply compressed air for various critical systems, such as the braking system, suspension system, and door control system. Moisture and impurities in the compressed air can severely damage these systems, such as corroding pipes, reducing braking efficiency, and affecting suspension stability. Therefore, air compressor systems are typically equipped with dryers to remove moisture and impurities from the compressed air, ensuring the reliability and safety of the system.

[0003] Currently, the dryers used on the air compressors of maglev trains are mostly dual-tower adsorption dryers. Their core components are two adsorption cylinders (referred to as cylinder A and cylinder B) and a switching valve. Desiccant is typically filled inside the adsorption cylinders to adsorb moisture from the compressed air. The two adsorption cylinders alternately perform adsorption and regeneration processes to achieve continuous drying.

[0004] The working principle of the dryer under test is as follows: During the adsorption stage, undried compressed air enters one of the adsorption cylinders (e.g., cylinder A) through a switching valve. The desiccant (e.g., activated alumina or molecular sieve) filled inside the adsorption cylinder adsorbs moisture from the compressed air, thus outputting dried compressed air. Part of the dried air is supplied to the train system, and the other part is used to regenerate the other adsorption cylinder.

[0005] During the regeneration phase, while cartridge A is adsorbing, a portion of dry compressed air flows through a throttle valve into another adsorption cartridge (e.g., cartridge B), back-blowing it at a lower pressure to remove the adsorbed moisture. This process is called regeneration. The regenerated gas, containing the moisture purged from the desiccant, is discharged through the drain port of the switching valve.

[0006] The adsorption and regeneration processes are periodically switched. When cylinder A becomes saturated and needs regeneration, the switching valve switches the gas path, causing cylinder B to enter the adsorption stage while cylinder A enters the regeneration stage. The switching action of the switching valve is usually controlled by a timer control board, for example, switching every minute. The specific working principle of the switching valve is as follows: When cylinder A is adsorbing, switching valve A is in the open state, and switching valve B is in the closed state. Compressed air enters cylinder A through switching valve A. A portion of the dried compressed air enters cylinder B through a throttle valve for regeneration, and the regenerated gas is discharged from the drain port below switching valve B. When the timer expires, the control signal drives the switching valve to operate. Switching valve A closes, and switching valve B opens. Compressed air begins to enter cylinder B through switching valve B for adsorption, while cylinder A enters the regeneration stage, and the regenerated gas is discharged from the drain port below switching valve A.

[0007] The continuous cycle of the above adsorption and regeneration processes ensures that the dryer can continuously provide dry compressed air.

[0008] However, existing dryers and their testing methods have the following technical problems:

[0009] Insufficient dryer durability testing: Traditional testing methods typically involve mounting the dryer on an air compressor for testing, with short testing periods that fail to adequately assess the dryer's long-term performance and reliability. For example, a 30-minute test only equates to 30 dryer switching operations, while in actual operation, the dryer may need to operate for several hours daily, undergoing hundreds of switching operations. This inadequate testing can lead to dryer malfunctions during long-term operation, affecting the normal operation of the train system.

[0010] Residual moisture in the dryer cavity: After testing, moisture can easily remain inside the dryer cavity, especially in the switching valve cavity. This residual moisture can corrode parts, leading to decreased dryer performance or even failure. Traditional testing methods lack effective solutions to this problem.

[0011] Dryer electrical signal testing is complex: Dryers typically require connections to multiple electrical signals, such as power input, pressure switch input, and fan power output. Traditional testing methods require mounting the dryer on an air compressor for testing, which involves complex wiring, is prone to errors, and makes it difficult to quickly locate the fault point once an electrical signal failure occurs.

[0012] Inaccurate test results for the dryer's drainage function: Traditional testing methods make it difficult to accurately control the moisture content entering the dryer, resulting in inaccurate drainage function test results and making it difficult to assess the actual drainage performance of the dryer.

[0013] Dryer testing is inefficient: Traditional testing methods require the dryer to be installed on an air compressor for testing. The installation and disassembly process is cumbersome and time-consuming, which reduces testing efficiency. Utility Model Content

[0014] This invention aims to solve the aforementioned technical problems by providing a comprehensive, efficient, and accurate testing device for the air compressor dryer unit of a maglev train, specifically addressing the issues of insufficient durability testing and residual moisture in the dryer cavity. By providing an independent testing platform, the dryer can undergo long-term durability testing, and the automatic purging function effectively removes residual moisture from the cavity, improving the dryer's reliability and service life.

[0015] This utility model solves the above-mentioned technical problems by means of the following: a testing device for a maglev train air compressor dryer unit, comprising: a first air storage tank, connected to the air source output interface of the dryer under test, for receiving dry air discharged from the air source output interface; a second air storage tank, one end of which is connected to the air source input interface of the dryer under test, and the other end is connected to an inlet valve for introducing dry air and a humidifying atomizing nozzle valve for introducing humidifying gas, wherein the inlet valve and the humidifying atomizing nozzle valve are arranged in parallel; the dryer under test has a drain vapor interface; after the humidifying atomizing nozzle valve introduces humidifying gas into the second air storage tank, the inlet valve introduces dry gas into the second air storage tank. This device can simulate the working environment of the dryer under real-world conditions. First, humidifying gas is introduced to simulate the entry of moisture in actual operation, so that the desiccant adsorbs moisture to a near-saturated state; then, drying gas is introduced to simulate the normal drying process of the dryer and the regeneration process after adsorption saturation. This verifies whether the dryer can complete the adsorption and regeneration process normally and discharge moisture when the adsorption of moisture is close to saturation, thereby testing the performance of the dryer more accurately and comprehensively and improving the reliability of the test.

[0016] Preferably, one end of the second air tank is connected to the air source input interface of the dryer under test via a first pressure switch, and the drain vapor interface is connected to a second pressure switch. The first pressure switch can simulate the pressure signal when the air compressor is working, triggering the timer control board of the dryer, thereby more realistically simulating the working state of the dryer; the second pressure switch can detect the pressure of the drain vapor from the dryer to determine whether the draining function is normal.

[0017] Preferably, a counter is associated with the second pressure switch and connected to the control box. The number of times the dryer discharges air can be recorded, thereby quantitatively assessing the dryer's drainage performance and providing a basis for subsequent data analysis.

[0018] Preferably, the control box supplies power to the dryer under test and controls the switching valve of the dryer under test to switch the gas path connection between the adsorption cylinders via a timing control board. This enables the testing equipment to automatically control the operation of the dryer, such as simulating the switching between adsorption and regeneration processes, without manual operation, thus improving testing efficiency and automation.

[0019] Preferably, the control box controls the gas path connection between the adsorption cylinders to switch periodically at set intervals via a timing control board. This can simulate the periodic switching process of the dryer in actual operation, and more accurately evaluate the long-term working performance and stability of the dryer.

[0020] Preferably, upon termination of the measurement, the control box controls the release of pressure from the first and second gas storage tanks. During this period, the control box controls the switching of the gas path connection between the adsorption cylinders until the pressure drops to the set pressure value. This allows for a safe termination of the test, avoiding safety risks caused by excessive pressure. Furthermore, by controlling the switching of the adsorption cylinders, residual gas in the dryer can be discharged, facilitating subsequent maintenance and upkeep.

[0021] Preferably, the drain valve is connected to the air source output port, and the capacity of the first air tank is larger than that of the second air tank. This is directly related to the proposed automatic purging scheme. The larger capacity of the first air tank can store more dry air after the test. When dry air is added to the second air tank, the dry air will flow through the dryer and eventually enter the first air tank, thereby achieving automatic purging and reducing residual moisture inside the dryer.

[0022] Preferably, the drain vapor interface is connected to the gas source output interface, and the conduction pressure of the first pressure switch is lower than that of the second pressure switch. This ensures that the second pressure switch is triggered only after the drain vapor pressure reaches a certain value during normal operation of the dryer, thereby avoiding misjudgment of the drain function.

[0023] Preferably, the air inlet valve and the humidifying atomizing nozzle valve, which are arranged in parallel, are both connected to a single air inlet, which outputs air to both the air inlet valve and the humidifying atomizing nozzle valve. This simplifies the air path design, facilitates operation, and allows them to share a single air inlet, reducing the size and cost of the testing equipment.

[0024] Preferably, the dryer under test is mounted on a dryer mounting bracket, the first gas storage tank is mounted on the base plate of the test equipment, and the base plate of the test equipment is fixed to the dryer mounting bracket. This improves the stability and reliability of the test equipment and facilitates the installation and disassembly of the dryer.

[0025] This invention cleverly simulates the adsorption saturation state that a dryer might encounter in actual operation by specifying the sequence of introducing humidifying gas into the second gas storage tank through the humidifying atomizing nozzle valve, followed by the introduction of dry gas into the second gas storage tank through the inlet valve. It verifies whether the dryer can still effectively adsorb and regenerate and discharge moisture even when near saturation. This testing method is closer to actual working conditions than traditional methods, enabling a more accurate evaluation of the dryer's performance and thus improving the reliability of the test. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the test equipment for the air compressor dryer unit of a maglev train according to one embodiment of the present invention.

[0027] Figure 2This is a schematic diagram of the control box according to one embodiment of the present invention. Detailed Implementation

[0028] The present invention will be described more clearly and completely below through embodiments and in conjunction with the accompanying drawings.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the structures shown in the drawings are merely illustrative and do not constitute any limitation on the present invention.

[0030] Figure 1 This is a schematic diagram of the test equipment for the air compressor dryer unit of a maglev train according to one embodiment of the present invention. Figure 2 This is a schematic diagram of the control box according to one embodiment of the present invention. Figure 1 As shown, this utility model discloses a test device for the air compressor dryer unit of a maglev train, which mainly includes a first air tank 29, a second air tank 9, a dryer under test 21, an air inlet valve 4, a humidifying atomizing nozzle valve (composed of a shut-off valve 5, a humidifying atomizing nozzle 6, a shut-off valve 7, and an external water storage container 8), and a pipeline distributor 12 connecting the first air tank 29 and the dryer under test 21.

[0031] The first air tank 29 is connected to the air source output port B of the dryer under test 21 via a pipeline, and is used to receive the dry air discharged from the air source output port B. The first air tank 29 has a volume of 5L, is cylindrical in shape, and is equipped with a drain valve 30 and a silencer 31 at the bottom, and a digital pressure gauge 28 at the top to display the pressure inside the tank.

[0032] One end of the second gas storage tank 9 is connected to the gas source input interface A of the dryer under test 21 via a pipeline, and the other end is connected to the inlet valve 4 and the humidifying atomizing nozzle valve via pipelines. The inlet valve 4 and the humidifying atomizing nozzle valve are arranged in parallel and are both connected to the air inlet 3 via pipelines. The air inlet 3 is used to supplement dry air from an external dry air source. The second gas storage tank 9 has a volume of 3L and is cylindrical in shape. A drain valve 10 and a silencer 11 are installed at its bottom. After the humidifying atomizing nozzle valve introduces humidifying gas into the second gas storage tank 9, the inlet valve 4 then introduces dry gas into the second gas storage tank 9. This sequence can simulate the working conditions from humidification to drying that the dryer may encounter in actual operation, thereby more comprehensively testing the performance of the dryer. For example, a certain amount of humidifying gas can be introduced into the second gas storage tank 9 through the humidifying atomizing nozzle valve first to simulate the state where the adsorbent is close to saturation after the dryer has been working for a long time. Then, the humidifying atomizing nozzle valve is closed, and the air inlet valve 4 is opened to introduce dry gas into the second air storage tank 9, simulating the adsorption and regeneration process of the dryer. By observing the dryer's operating status and drainage, the performance of the dryer under different operating conditions can be evaluated more accurately.

[0033] Furthermore, one end of the second gas storage tank 9 is connected to the gas source input interface A of the dryer under test 21 via a first pressure switch 13. A second pressure switch 24 is connected to the drain vapor interface C. The first pressure switch 13 is installed on the pipeline distributor 12, and its conduction pressure is set to 0.8 bar. When the pressure inside the second gas storage tank 9 reaches 0.8 bar, the first pressure switch 13 is activated, sending a signal to the control box 15 to trigger the timer control board of the dryer 21 to start working and control the switching valve to perform periodic switching. The second pressure switch 24 is installed on the pipeline of the drain vapor interface C of the dryer 21, and its conduction pressure is set to 2.0 bar. When the pressure of the dryer's drain vapor reaches 2.0 bar, the second pressure switch 24 is activated, sending a signal to the control box 15 to record the number of times the dryer exhausts. The setting of these two pressure switches allows for more precise control and monitoring of the dryer's testing process, improving the reliability of the test results. In other embodiments, the first pressure switch 13 can also be directly connected to the timer control board of the dryer 21.

[0034] Furthermore, such as Figure 1 , 2 As shown, a counter 18 is associated with the second pressure switch 24, and the counter 18 is connected to the control box 15. The counter 18 is used to record the number of times the dryer 21 exhausts; each time the second pressure switch 24 is turned on, the count value of the counter 18 increments by 1. The control box 15 can read the count value of the counter 18 and display it on the control panel for easy reading and recording by the test personnel.

[0035] Furthermore, the control box 15 supplies power to the dryer under test 21 and controls the switching valve of the dryer under test 21 to switch the gas path connection between the adsorption cylinders 22 and 23 via the timing control board. The control box 15 integrates a power module, control circuit, and display screen, providing 24V DC power to the dryer 21 and controlling the switching valve of the dryer 21 via control signals to simulate the switching between adsorption and regeneration processes. The front panel of the control box 15 is equipped with a start switch 20, a digital timer 17, and a power indicator light 19, facilitating operation and monitoring of the testing process by the testing personnel.

[0036] Furthermore, the control box 15 controls the gas path connection between the adsorption cylinders 22 and 23 to switch periodically at set intervals, such as once every minute. This can simulate the periodic switching process of the dryer in actual operation, and more accurately evaluate the long-term working performance and stability of the dryer. The switching time can be set by the digital display timer 17 on the control box 15. In other embodiments, the following operation can also be performed: turn off the control switch, toggle switch 20, and then manually close the air inlet valve 4, while simultaneously releasing the pressure inside the air tanks 9 and 29 through the shut-off valves 10 and 30.

[0037] Furthermore, upon completion of the measurement, control box 15 controls the release of pressure from the first gas storage tank 29 and the second gas storage tank 9. During this period, control box 15 controls the switching of the gas path connection between adsorption cylinders 22 and 23 until the pressure drops to a set value, such as 0.5 bar. This safely terminates the test, avoiding safety risks caused by excessive pressure. Furthermore, by controlling the switching of the adsorption cylinders, residual gas and moisture in the dryer can be discharged, facilitating subsequent maintenance and upkeep.

[0038] Furthermore, the drain valve C is connected to the air source output port B, and the capacity of the first air tank 29 is greater than that of the second air tank 9. The capacity of the first air tank 29 is 5L, which is greater than the 3L of the second air tank 9. This realizes the automatic purging function of this utility model. After the drain function test is completed, dry compressed air continues to be supplied to the second air tank 9 through the air inlet 3 and the air inlet valve 4 until the first air tank 29 reaches the preset pressure, for example, 5 bar. Since the first air tank 29 has a larger capacity, a large amount of dry air needs to be supplied in order to reach the preset pressure. This dry air flows through the dryer 21 before entering the first air tank 29, and carries away the residual moisture inside the dryer 21, especially in the switching valve chamber, thereby realizing automatic purging, effectively solving the problem of residual water corroding parts, and improving the reliability and service life of the dryer.

[0039] Furthermore, the drain vapor interface C is connected to the gas source output interface B, and the conduction pressure of the first pressure switch 13 is lower than the conduction pressure of the second pressure switch 24. The conduction pressure of the first pressure switch 13 is 0.8 bar, which is lower than the conduction pressure of the second pressure switch 24, which is 2.0 bar. This ensures that during normal operation of the dryer, the second pressure switch 24 will only be triggered when the pressure of the drain vapor reaches a certain value, thereby avoiding misjudgment of the drain function.

[0040] Furthermore, the parallel-connected air intake valve 4 and the humidifying atomizing nozzle valve are both connected to the air intake port 3, which outputs air to both the air intake valve 4 and the humidifying atomizing nozzle valve. The air intake port 3 is a quick-connect interface for easy connection to an external air source. This parallel configuration simplifies the air path design, facilitates operation, and allows all components to share a single air intake port 3, reducing the size and cost of the testing equipment.

[0041] Furthermore, the dryer under test 21 is mounted on the dryer mounting bracket 2 and secured with fixing bolts 27. The first gas storage tank 29 and the second gas storage tank 9 are both mounted on the test equipment base plate 1, which is fixed to the dryer mounting bracket 2 by several support columns (not shown in the figure), forming an integrated test platform. The dryer mounting bracket 2 has an L-shaped structure, forming a 90° angle with the test equipment base plate 1 to ensure the stability of the dryer under test 21. This installation method improves the stability and reliability of the test equipment and facilitates the installation and disassembly of the dryer 21.

[0042] The specific test items and methods are as follows.

[0043] I. Preparations before the test

[0044] Install the dryer under test: Place the dryer under test 21 on the dryer mounting bracket 2 and secure it firmly using the fixing bolts 27. Ensure that the dryer 21 is installed stably to avoid movement or vibration during the test.

[0045] Connect the air source: Connect an external dry compressed air source to inlet 3 via the quick-connect interface. Ensure a secure connection to prevent leaks.

[0046] Connect the input and output cables to the control box:

[0047] Connect the 220VAC power cord to the power input interface 16 of the control box 15.

[0048] Connect the 24VDC power output line of the control box 15 to the power input interface a of the dryer under test 21.

[0049] Connect the drain count signal line of control box 15 to the second pressure switch 24.

[0050] Connect the dryer air path:

[0051] Connect the output air pipe of the pipe distributor 12 to the air source input interface A of the dryer under test 21.

[0052] Connect the inlet pipe of the first gas storage tank 29 to the gas source output port B of the dryer under test 21.

[0053] Connect the drain steam inlet C of the dryer 21 to the second pressure switch 24 and the silencer 25.

[0054] Connect the dryer signal cable:

[0055] Connect the start pressure switch signal line b of the dryer 21 to the first pressure switch 13.

[0056] Connect the 24VDC power output line c of dryer 21 to the output indicator light 26.

[0057] II. Dryer Function Test

[0058] Pressurization preparation: Open the air inlet valve 4 to fill the second air tank 9 with dry compressed air. Observe the digital pressure gauge 14 to ensure that the pressure in the second air tank 9 reaches above 5 bar. This step is to ensure a sufficient air supply during the test.

[0059] Start the test: Turn on the start switch 20 of the control box 15 and press the reset buttons for the counter 18 and the digital timer 17 to clear the count and timing. At this point, the dryer function test officially begins. The control box 15 will control the switching valve of the dryer 21 to switch periodically according to a preset program, for example, once every minute. Observe whether the count value of the counter 18 matches the number of switching cycles to verify whether the dryer timer control board and the switching valve are functioning correctly.

[0060] Stop the test: After the preset test time is reached, turn off the start switch 20 of the control box 15 and close the air inlet valve 4. Open the drain valve 10 of the second air tank 9 and the drain valve 30 of the first air tank 29 to release the pressure in both air tanks until the pressure gauges 14 and 28 show a pressure value of zero (to atmospheric pressure). In some embodiments, before turning off the start switch 20, the switching valve can be operated multiple times to remove any remaining moisture by utilizing the residual air pressure in the first and second air tanks before reaching atmospheric pressure.

[0061] III. Dryer Drainage Function Test

[0062] Humidification Preparation: Confirm that the pressure inside the second air tank 9 is zero. Open shut-off valves 5 and 7 to allow water from the external water storage container 8 to enter the humidifying atomizing nozzle 6 through siphon action and be sprayed into the second air tank 9 in atomized form. After adding an appropriate amount of water vapor to the second air tank 9, close shut-off valves 5 and 7. The purpose of this step is to simulate the situation where compressed air contains moisture during actual operation.

[0063] Perform the test: Repeat steps 1 and 2 of the "Dryer Function Test" and observe whether water vapor is discharged from the muffler 25 connected to the drain steam interface C of the dryer 21. If water vapor is discharged, it indicates that the dryer's drainage function is normal; if no water vapor is discharged, it is necessary to check whether the dryer is faulty.

[0064] IV. Dryer Output Power Test

[0065] Preparation for testing: Repeat steps 1 and 2 of the "Dryer Function Test".

[0066] Observe the indicator lights: Check whether the output indicator light 26 is lit normally to verify whether the 24VDC power output function of the dryer 21 is normal.

[0067] V. Continuous Operation Test of the Dryer

[0068] Test Preparation: Repeat Steps 1 and 2 of the "Dryer Function Test".

[0069] Set the Test Time: Set the time for the continuous operation test of the dryer, such as 48 hours. During this period, the control box 15 will continuously control the dryer 21 to perform periodic switching.

[0070] Evaluate the Results: After the test, record the count value of the counter 18, which is the actual number of actions of the dryer switching valve. Calculate the theoretical number of actions (test time × 60 times / hour). If the absolute value of the difference between the actual number of actions and the theoretical number of actions is less than 1% of the theoretical number of actions, the dryer maintenance is considered qualified.

[0071] Through the above test items, the performance indicators of the dryer can be comprehensively evaluated to ensure that it can meet the requirements of actual operation. The test method provided by the utility model is easy to operate, accurate in results, and high in efficiency, which can effectively improve the maintenance quality of the dryer and ensure the safe and reliable operation of the maglev train.

Claims

1. A test apparatus for a maglev train air compressor dryer unit, characterized by, comprising a first gas tank (29) connected to a gas source output interface (B) of a measured dryer (21) for receiving dry air discharged by the gas source output interface, a second gas tank (9) having one end connected to a gas source input interface (A) of the measured dryer (21), the other end connected to an air inlet valve (4) for leading in dry air and a humidification atomizing nozzle valve for leading in humidified gas, the air inlet valve (4) and the humidification atomizing nozzle valve being arranged in parallel, the measured dryer (21) having a water vapor discharge interface (C), after the humidification atomizing nozzle valve leads in humidified gas into the second gas tank (9), the air inlet valve (4) leads in dry gas into the second gas tank (9).

2. The test equipment for the air compressor dryer unit of the maglev train according to claim 1, characterized in that a second gas tank (9) having one end connected to a gas source input interface (A) of a measured dryer (21) through a first pressure switch (13), the water vapor discharge interface (C) is connected with a second pressure switch (24).

3. The test equipment for the air compressor dryer unit of the maglev train according to claim 2, characterized in that the second pressure switch (24) is associated with a counter (18), and the counter (18) is connected to a control box (15).

4. The test equipment for the air compressor dryer unit of the maglev train according to claim 3, characterized in that the control box (15) supplies power to the measured dryer (21) and controls the switching of the gas path connection between the adsorption cylinders of the measured dryer (21) through a timing control board.

5. The test equipment for the air compressor dryer unit of the maglev train according to claim 4, characterized in that the control box (15) controls the switching of the gas path connection between the adsorption cylinders periodically at a set time through a timing control board.

6. The test equipment for the air compressor dryer unit of the maglev train according to claim 5, characterized in that at the end of the measurement, the control box (15) controls the release of pressure of the first gas tank and the second gas tank, and during this period, the control box (15) controls the switching of the gas path connection between the adsorption cylinders until the pressure drops to a set pressure value.

7. The test equipment for the air compressor dryer unit of the maglev train according to claim 5, characterized in that the water vapor discharge interface (C) is in communication with the gas source output interface (B), and the capacity of the first gas tank (29) is greater than that of the second gas tank (9).

8. The test equipment for the air compressor dryer unit of the maglev train according to claim 5, characterized in that the water vapor discharge interface (C) is in communication with the gas source output interface (B), and the conduction pressure of the first pressure switch (13) is less than that of the second pressure switch (24).

9. The test equipment for the air compressor dryer unit of the maglev train according to claim 1, characterized in that The air inlet valve (4) and the humidifying atomizing nozzle valve are connected to an air inlet (3), and the air inlet (3) outputs air to the air inlet valve (4) and the humidifying atomizing nozzle valve.

10. The test equipment for the magnetic levitation train air compressor dryer unit according to claim 1, characterized in that, The measured dryer (21) is installed on a dryer fixing support (2), the first air tank (29) is installed on a test equipment bottom plate (1), and the test equipment bottom plate (1) is fixed to the dryer fixing support (2).

Images