Bench test bench

Abstract

This disclosure provides a torsion tube test bench, belonging to the field of automotive testing technology. The torsion tube test bench includes an environmental chamber, a vacuum pump, a steam generator, and a refrigeration unit. The environmental chamber houses the intake hose and the torsion tube, wherein the intake hose has a first intake port, a second intake port, and a first exhaust port, and the torsion tube has a third intake port and a second exhaust port, the second exhaust port being connected to the second intake port. The vacuum pump is located outside the environmental chamber and connected to the first exhaust port to draw air from the intake hose. The steam generator is located outside the environmental chamber and connected to the second intake port to introduce water vapor into the torsion tube. The refrigeration unit is located inside the environmental chamber to simulate the external environment in winter. Thus, only the torsion tube and the intake hose need to be tested, eliminating the need to test the entire vehicle, reducing testing costs and simplifying the testing process.

Description

Technical Field

[0001] This disclosure relates to the field of automotive testing technology, and in particular to a curved tube test bench. Background Technology

[0002] When the engine is running, the combustible mixture and exhaust gases from the combustion chamber enter the crankcase. If the exhaust gases are not discharged from the crankcase in time, it will cause the crankcase pressure to rise, leading to oil leaks and even engine damage. If the exhaust gases are directly discharged into the atmosphere, they will pollute the air. Therefore, the crankcase ventilation system separates these exhaust gases into oil and gas, and then the exhaust gases enter the combustion chamber again through the crankcase ventilation pipe and intake hose to participate in combustion. In winter, when these exhaust gases are sent into the intake hose through the crankcase ventilation pipe, the temperature inside the intake hose is close to the ambient temperature, while the exhaust gases contain a certain amount of moisture and have a certain temperature. Therefore, when the high-humidity exhaust gases encounter the strong cold air in the intake hose, they will sublimate into ice, gradually blocking the exhaust port of the crankcase ventilation pipe. This causes the engine pressure to rise, leading to oil leaks and even quality problems such as fuel spills. Therefore, the crankcase ventilation pipe must be tested before the car leaves the factory to check whether it will freeze in low-temperature environments.

[0003] In related technologies, the entire vehicle is typically transported to extremely cold regions for road testing to assess the anti-icing capabilities of the curved pipe. However, the road testing process is complex and costly. Summary of the Invention

[0004] This disclosure provides a curved pipe test bench that can solve the technical problems existing in related technologies. The technical solution of the curved pipe test bench is as follows.

[0005] This disclosure provides a torsion tube test bench, which includes an environmental chamber, a vacuum pump, a steam generator, and a refrigeration device;

[0006] The environmental chamber is used to accommodate an air intake hose and a bend pipe, wherein the air intake hose has a first air inlet, a second air inlet and a first exhaust outlet, and the bend pipe has a third air inlet and a second exhaust outlet, and the second exhaust outlet is connected to the second air inlet;

[0007] The air extraction machine is located outside the environmental chamber and is used to connect to the first exhaust port to extract air from the air inlet hose;

[0008] The steam generator is located outside the environmental chamber and is used to connect to the third air inlet to input water vapor into the curved pipe;

[0009] The refrigeration unit is located inside the environmental chamber.

[0010] In one possible implementation, the tortuous tube test bench further includes a pressure sensor located inside the tortuous tube;

[0011] The pressure sensor is electrically connected to the vacuum pump and the steam generator. After the pressure measured by the pressure sensor reaches the first pressure value, the vacuum pump and the steam generator stop working.

[0012] The technical solution provided in this disclosure, by installing a pressure sensor inside the bend pipe, can accurately measure the internal air pressure. This allows inspectors to determine the icing time at the second exhaust port of the bend pipe based on the internal air pressure, thereby assessing the bend pipe's anti-icing capability. Furthermore, once the pressure measured by the pressure sensor reaches a first pressure value, the vacuum pump and steam generator stop operating, preventing damage to the bend pipe due to excessive internal pressure.

[0013] In one possible implementation, the first pressure value is 18 kPa-22 kPa.

[0014] In one possible implementation, the first pressure value is 20 kPa.

[0015] In one possible implementation, the torsion tube test bench further includes a camera for acquiring an image of the connection between the second exhaust port and the second intake port.

[0016] The technical solution provided in this disclosure uses a camera to capture a real-time image of the connection between the bend pipe and the intake hose. This allows inspectors to more intuitively observe the icing time at the second exhaust port of the bend pipe, thereby assessing the bend pipe's anti-icing capability.

[0017] In one possible implementation, the torsion tube test bench further includes an air filter;

[0018] The air filter is located inside the environmental chamber and is connected to the first air inlet.

[0019] The technical solution provided in this disclosure includes an air filter installed inside the environmental chamber, so that the gas in the air chamber passes through the air filter before entering the intake hose. In this way, the air filter removes impurities from the air, preventing them from entering the intake hose and affecting the airflow within it, thereby ensuring that the air pressure in the intake hose is not affected by impurities or foreign objects.

[0020] In one possible implementation, the through-tube test bench further includes a temperature sensor located inside the environmental chamber.

[0021] The technical solution provided in this disclosure involves installing a temperature sensor in an environmental chamber. The temperature sensor can display the real-time temperature in the environmental chamber, enabling testing personnel to determine whether the temperature in the environmental chamber can accurately simulate the temperature in the external environment. This allows testing personnel to adjust the temperature of the air output from the refrigeration device or adjust the air volume of the refrigeration device.

[0022] In one possible implementation, the temperature of the steam discharged from the steam generator is 10°C to 20°C.

[0023] In one possible implementation, the steam generator discharges 65L to 70L of water vapor per minute.

[0024] In one possible implementation, the air pump draws in 360 kg to 450 kg of air per hour from the environmental chamber.

[0025] In one possible implementation, the refrigeration device outputs 580 kg to 600 kg of low-temperature air per hour, wherein the temperature of the low-temperature air is -50°C to 0°C.

[0026] In one possible implementation, the pressure in the intake hose is -7 kPa to -5 kPa.

[0027] In one possible implementation, the pressure in the curved pipe is -5 kPa to 1 kPa.

[0028] The technical solution provided in this disclosure includes at least the following beneficial effects:

[0029] This disclosure provides a curved pipe test bench. A refrigeration device maintains a low temperature within the environmental chamber, simulating a winter environment. An air extractor draws air from the intake hose, simulating the pressure conditions formed in the intake hose and curved pipe during engine operation. Since the air extractor is located outside the environmental chamber, the heat generated during its operation does not affect the temperature inside the chamber. A steam generator introduces steam into the curved pipe to simulate the gas temperature at the second exhaust port of the curved pipe at low temperatures. Again, because the steam generator is located outside the environmental chamber, the heat generated during its operation does not affect the temperature inside the chamber. Thus, only the curved pipe and intake hose need to be tested, eliminating the need to test the entire vehicle, reducing testing costs and simplifying the testing process.

[0030] In addition, compared with the external environment, the temperature in the environmental chamber is easier to control and can simulate the temperature under various environments.

[0031] Furthermore, testing the curved pipe on the curved pipe test bench eliminates the need for full vehicle testing on the road, reducing safety hazards during the testing process.

[0032] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. In the drawings:

[0034] Figure 1 This is a schematic diagram of the structure of a through-tube test bench according to an embodiment of the present disclosure;

[0035] Figure 2 This is a schematic diagram of the structure of a through-tube test bench according to an embodiment of the present disclosure;

[0036] Figure 3 This is a partial structural schematic diagram of a through-tube test bench according to an embodiment of the present disclosure;

[0037] Figure 4 This is a partial structural schematic diagram of a through-tube test bench according to an embodiment of the present disclosure.

[0038] Legend:

[0039] 1. Environmental Warehouse;

[0040] 2. Vacuum pump;

[0041] 3. Steam generator;

[0042] 4. Refrigeration equipment;

[0043] 5. Pressure sensor;

[0044] 6. Camera;

[0045] 7. Air filter; 70. Air vent;

[0046] 8. Temperature sensor;

[0047] 10. Intake hose; 101. First air inlet; 102. Second air inlet; 103. First exhaust outlet;

[0048] 20. Bend pipe, 201. Third air inlet, 202. Second exhaust port.

[0049] The accompanying drawings have illustrated specific embodiments of this disclosure, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this disclosure to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be further described in detail below with reference to the accompanying drawings.

[0051] The terminology used in the embodiments of this disclosure is for illustrative purposes only and is not intended to limit the disclosure. Unless otherwise defined, the technical or scientific terms used herein should be understood in their ordinary sense by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “a” or “one,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising,” “including,” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0052] When the engine is running, the combustible mixture and exhaust gases from the combustion chamber enter the crankcase. If the exhaust gases are not discharged from the crankcase in time, it will cause the crankcase pressure to rise, leading to oil leaks or even engine damage. If the exhaust gases are directly discharged into the atmosphere, they will pollute the air. Therefore, the crankcase ventilation system separates these exhaust gases into oil and gas, and then the exhaust gases enter the combustion chamber again through the crankcase ventilation pipe and intake hose to participate in combustion. In winter, when these exhaust gases are sent into the intake hose through the crankcase ventilation pipe, the temperature inside the intake hose is close to the ambient temperature, while the exhaust gases contain a certain amount of moisture and have a certain temperature. Therefore, when the high-humidity exhaust gases encounter the strong cold air in the intake hose, they will sublimate into ice, gradually blocking the exhaust port of the crankcase ventilation pipe. This causes the engine pressure to rise, leading to oil leaks or even safety issues. Therefore, the crankcase ventilation pipe must be tested before the car leaves the factory to check whether it will freeze in low-temperature environments, thus determining the anti-icing capability of the crankcase ventilation pipe.

[0053] Various manufacturers have designed different solutions to prevent icing of the bend pipes. These solutions are ultimately implemented in vehicles and tested in extremely cold regions of China during winter to assess the bend pipes' anti-icing capabilities. However, road testing is complex and costly. Alternatively, some manufacturers rent vehicle environmental simulation labs to simulate winter conditions and test whether the bend pipes will freeze. While these labs are typically rated to withstand -40°C, the actual temperature can only be maintained at -28°C when vehicles are continuously traveling at high speeds, making the environment unstable.

[0054] Therefore, how to test the anti-icing ability of curved pipes in a simple, quick, and low-cost manner is a key issue that needs to be addressed.

[0055] In view of the above-mentioned technical problems, this disclosure provides a curved pipe test bench, which can conveniently and quickly test curved pipes. The implementation of the curved pipe test bench is described below by way of example.

[0056] like Figure 1 and Figure 2 As shown, the tortuous tube test bench includes an environmental chamber 1, an air extractor 2, a steam generator 3, and a cooling device 4. The environmental chamber 1 houses an inlet hose 10 and a tortuous tube 20, wherein the inlet hose 10 has a first inlet 101, a second inlet 102, and a first outlet 103. The tortuous tube 20 has a third inlet 201 and a second outlet 202, the second outlet 202 being connected to the second inlet 102. The air extractor 2 is located outside the environmental chamber 1 and is connected to the first outlet 103 to extract air from the inlet hose 10. The steam generator 3 is located outside the environmental chamber 1 and is connected to the third inlet 201 to introduce water vapor into the tortuous tube 20. The cooling device 4 is located inside the environmental chamber 1.

[0057] The curved tube test bench can be connected to a host computer, allowing testing personnel to control the air extractor 2 and steam generator 3 within the test bench. The air extractor 2 draws air out of the environmental chamber 1 through the air inlet hose 10.

[0058] The refrigeration unit 4 continuously supplies cold air into the environmental chamber 1 to maintain a consistently low-temperature environment. Furthermore, because the air pump 2 continuously draws air from the environmental chamber 1 through the intake hose 10, the continuous supply of cold air by the refrigeration unit 4 is necessary to ensure a relatively stable air pressure within the environmental chamber 1. The refrigeration unit 4 can adjust the temperature and velocity of the output cold air, thereby regulating the temperature within the environmental chamber 1 to simulate external environments at different temperatures.

[0059] The technical solution provided in this embodiment allows the refrigeration device 4 to maintain a low temperature in the environmental chamber 1, thereby simulating the external environment in winter. The vacuum pump 2 draws air from the intake hose 10, simulating the pressure conditions formed in the intake hose 10 and the bend pipe 20 when the engine is running. Furthermore, since the vacuum pump 2 is located outside the environmental chamber 1, the heat generated by the vacuum pump 2 during operation will not affect the temperature inside the environmental chamber 1. The steam generator 3 inputs water vapor into the bend pipe 20 to simulate the gas temperature at the second exhaust port 202 of the bend pipe 20 at low temperatures. Again, since the steam generator 3 is located outside the environmental chamber 1, the heat generated by the steam generator 3 during operation will not affect the temperature inside the environmental chamber 1. Thus, only the bend pipe 20 and the intake hose 10 need to be tested, eliminating the need to test the entire vehicle, reducing testing costs and simplifying the testing process.

[0060] In addition, compared with the external environment, the temperature in environmental chamber 1 is easier to control and can simulate the temperature under various environments.

[0061] Furthermore, testing the curved tube 20 on the curved tube test bench eliminates the need for full-vehicle testing on the road, reducing safety hazards during the testing process.

[0062] In some examples, such as Figure 3 As shown, the curved tube test bench also includes a pressure sensor 5, which is located inside the curved tube 20. The pressure sensor 5 is electrically connected to the vacuum pump 2 and the steam generator 3. After the pressure measured by the pressure sensor 5 reaches the first pressure value, the vacuum pump 2 and the steam generator 3 stop working.

[0063] When ice begins to form in the bend pipe 20, the second exhaust port 202 will be blocked, making it difficult for the gas in the bend pipe 20 to escape. Since the steam generator 3 continues to supply water vapor to the bend pipe 20, the pressure in the bend pipe 20 will gradually increase. By installing a pressure sensor 5 inside the bend pipe 20, the pressure inside the bend pipe 20 can be continuously monitored, thus determining the icing time of the bend pipe 20. Based on this, it can be deduced how long the engine will operate in a low-temperature environment before the bend pipe 20 begins to ice over.

[0064] After the curved pipe test bench is connected to the host computer, the host computer can display the pressure in the curved pipe 20. The first pressure value can be the pressure in the curved pipe 20 after the second vent 202 is blocked. When the second vent 202 is blocked, there is no need to continue inputting water vapor into the curved pipe 20, therefore the vacuum pump 2 and steam generator 3 stop working. This completely simulates the process of the curved pipe freezing during car operation in winter. If the pressure measured by the pressure sensor 5 exceeds the first pressure value, and the vacuum pump 2 and steam generator 3 continue to operate, the curved pipe 20 will be damaged due to excessive pressure inside the pipe.

[0065] Of course, the testing personnel can also set the first pressure value according to actual needs, such as setting the first pressure value lower than the pressure value inside the pipe after the bend pipe 20 is blocked.

[0066] In some examples, the initial pressure value is 18 kPa-22 kPa.

[0067] For example, the first pressure value can be 20 kPa.

[0068] In some examples, such as Figure 4 As shown, the curved pipe test bench also includes a camera 6, which is used to acquire images of the connection between the second exhaust port 202 and the second air inlet 102. In this way, the tester can more intuitively see the icing process at the connection between the second exhaust port 202 and the second air inlet 102, thereby judging the anti-icing effect of the curved pipe 20.

[0069] Once the through-tube test bench is connected to the host computer, the host computer can be used to display the images acquired by camera 6.

[0070] It is understandable that camera 6 should be a camera that can withstand low temperatures, so as to avoid camera 6 failing to work properly in low temperature environments.

[0071] In some examples, such as Figure 1 As shown, the flexible tube test bench also includes an air filter 7. The air filter 7 is located inside the environmental chamber 1 and is connected to the first air inlet 101. The air filter 7 has an air vent 70 on its exterior, through which the air from the environmental chamber 1 enters the interior of the air filter 7. The air filter 7 prevents impurities or foreign objects in the environmental chamber 1 from entering the air inlet hose 10, thereby ensuring that the air pressure in the air inlet hose 10 is not affected by impurities or foreign objects.

[0072] The air filter 7 can be used as an air filter in the vehicle, that is, the air filter 7 is placed at the same time as the intake hose 10 and the bend pipe 20. Alternatively, the air filter 7 can also be fixed in the environmental chamber 1, in which case the air filter 7 can also be other types of filters.

[0073] In some examples, the temperature of the steam discharged from the steam generator 3 is 10°C to 20°C. This simulates the gas temperature at the outlet of the engine's bypass pipe under low-temperature conditions.

[0074] For example, the temperature of the steam discharged from the steam generator 3 can be 20°C.

[0075] In some examples, steam generator 3 discharges 65L to 70L of steam per minute.

[0076] For example, steam generator 3 can discharge 68L of water vapor per minute.

[0077] In some examples, the air extractor 2 draws in 360 kg to 450 kg of air per hour from the environmental chamber 1. The air passes through the air filter 7 and the intake hose 10 in sequence, thereby simulating the pressure conditions formed in the intake hose 10 and the torsion pipe 20 when the engine supercharger in the vehicle is working.

[0078] In some examples, the pressure in the intake hose 10 is -7 kPa to -5 kPa under the action of the vacuum pump 2 and the steam generator 3, thereby simulating the environmental pressure of the intake hose 10 in the whole vehicle.

[0079] In some examples, the pressure in the bypass pipe 20 is simulated in the whole vehicle by the action of the vacuum pump 2 and the steam generator 3, and by adjusting the diameter of the pipe opening of the bypass pipe 20, so that the pressure in the bypass pipe 20 is -5KPa to 1KPa.

[0080] In some examples, the refrigeration unit 4 outputs 580 kg to 600 kg of low-temperature air per hour, thereby maintaining a low temperature in the environmental chamber 1 and preventing the temperature in the environmental chamber 1 from being affected by the water vapor in the bend pipe 20.

[0081] For example, the refrigeration unit 4 outputs 600 kg of low-temperature air per hour.

[0082] The temperature of the low-temperature air is -50℃ to 0℃. The testing personnel can adjust the temperature of the low-temperature air output from the refrigeration unit 4 according to the simulated ambient temperature.

[0083] When the curved tube test bench is connected to the host computer, the tester can adjust the temperature of the cooling device 4 through the host computer.

[0084] In some examples, such as Figure 1As shown, the through-tube test bench also includes a temperature sensor 8, which is located inside the environmental chamber 1. The temperature sensor 8 can display the real-time temperature in the environmental chamber 1, allowing the tester to determine whether the temperature in the environmental chamber 1 can accurately simulate the temperature in the external environment, so that the tester can adjust the temperature of the air output by the cooling device 4 or adjust the airflow of the cooling device 4.

[0085] For example, if environmental chamber 1 needs to simulate an external environment of -40℃, and temperature sensor 8 detects that the temperature in environmental chamber 1 is -30℃, the testing personnel can increase the air volume of cooling device 4 or decrease the temperature of the air output by cooling device 4 to make the environmental chamber reach the target temperature.

[0086] When the through-tube test stand is connected to the host computer, the host computer can display the temperature detected by the temperature sensor 8, which makes it easier for the test personnel to observe the temperature in the environmental chamber.

[0087] The working process of the curved tube test bench is described below by way of example.

[0088] First, place the intake hose 10 and the bend pipe 20 in the environmental chamber 1, and connect the first air inlet 101 of the intake hose 10 to the air filter 7, and connect the second air inlet 102 of the intake hose 10 to the second exhaust port of the bend pipe 20. Connect the first exhaust port 103 of the intake hose 10 to the air extractor 2, and connect the steam generator 3 to the third air inlet 201 of the bend pipe 20.

[0089] The second step is to place the pressure sensor 5 in the bend pipe 20 and place the camera 6 at the connection between the intake hose 10 and the bend pipe 20, so that the camera 6 can capture an image of the connection between the intake hose 10 and the bend pipe 20.

[0090] The third step is to turn on the cooling device 4 and adjust the temperature and speed of the cold air output by the cooling device 4 according to the temperature displayed by the temperature sensor 8 until the temperature in the environmental chamber 1 reaches the first target temperature.

[0091] Fourth step, turn on the vacuum pump 2 and the steam generator 3, so that the vacuum pump 2 draws air from the air inlet hose 10 and the steam generator 3 inputs water vapor into the curved pipe 20.

[0092] Fifth, adjust the temperature and speed of the cold air output by the refrigeration device 4 until the temperature in the environmental chamber 1 reaches the second target temperature to simulate different environmental temperatures, and repeat the operation of the fourth step.

[0093] Step 6: When the pressure sensor 5 detects the first pressure value, shut down the vacuum pump 2 and the steam generator 3.

[0094] Step 7: Remove the air intake hose 10 and the bend pipe 20 from the environmental chamber 1, and remove the pressure sensor 5 and the camera 6 from the bend pipe 20.

[0095] As can be seen from the above steps, the process of testing the curved pipe 20 using the curved pipe test bench is relatively simple, does not require too many testing personnel to operate, and greatly reduces the safety hazards of the testing process compared with road testing.

[0096] Using the tortuous tube test bench provided in this embodiment, on the one hand, it is possible to verify the anti-icing capability of the tortuous tube 20 in the original design (how long the tortuous tube 20 can remain unblocked). On the other hand, it is also possible to verify the effectiveness of the improved solution, that is, to verify the anti-icing capability of the improved tube 20.

[0097] The above description is merely an optional embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A test bench for curved pipes, characterized in that, The tortuous tube test bench includes an environmental chamber (1), a vacuum pump (2), a steam generator (3), a refrigeration device (4), and a pressure sensor (5); The environmental chamber (1) is used to accommodate the air inlet hose (10) and the bend pipe (20), wherein the air inlet hose (10) has a first air inlet (101), a second air inlet (102) and a first exhaust port (103), and the bend pipe (20) has a third air inlet (201) and a second exhaust port (202), and the second exhaust port (202) is connected to the second air inlet (102); The air extractor (2) is located outside the environmental chamber (1) and is used to connect to the first exhaust port (103) to extract air from the air inlet hose (10). The steam generator (3) is located outside the environmental chamber (1) and is used to connect to the third air inlet (201) to input water vapor into the curved pipe (20); The refrigeration device (4) is located inside the environmental chamber (1); The pressure sensor (5) is located inside the curved pipe (20). The pressure sensor (5) is electrically connected to the vacuum pump (2) and the steam generator (3). After the pressure measured by the pressure sensor (5) reaches the first pressure value, the vacuum pump (2) and the steam generator (3) stop working. The curved pipe test bench also includes a camera (6), which is used to acquire an image of the connection between the second exhaust port (202) and the second air inlet (102); The curved tube test bench also includes an air filter (7), which is located inside the environmental chamber (1) and connected to the first air inlet (101).

2. The curved pipe test bench according to claim 1, characterized in that, The first pressure value is 18 kPa-22 kPa.

3. The curved pipe test bench according to claim 1, characterized in that, The curved tube test bench also includes a temperature sensor (8), which is located inside the environmental chamber (1).

4. The tortuous tube test bench according to any one of claims 1-3, characterized in that, The temperature of the steam discharged from the steam generator (3) is 10℃~20℃.

5. The tortuous tube test bench according to any one of claims 1-3, characterized in that, The steam generator (3) discharges 65L to 70L of steam per minute.

6. The tortuous tube test bench according to any one of claims 1-3, characterized in that, The air pump (2) draws in 360 kg to 450 kg of air per hour from the environmental chamber (1).

7. The curved pipe test bench according to any one of claims 1-3, characterized in that, The refrigeration device (4) outputs 580 kg to 600 kg of low-temperature air per hour, wherein the temperature of the low-temperature air is -50°C to 0°C.

Images