Temperature and humidity control system and method for integral alternating salt spray test

Abstract

The invention discloses a temperature and humidity control system and method for a monolithic alternating salt spray test, which mainly solves the problems of slow heating rate, large temperature fluctuation and poor uniformity in the existing monolithic salt spray test, and comprises a test bin, a heating device, a mist discharging device, a temperature and humidity monitoring device, a hot air device and a humidifying device. Wherein the heating device comprises a boiler, a water inlet pipeline, a circulating water pump, a temperature sensor, a water return pipeline and a ground heating pipeline, and is used for heating the test bin; the mist discharging device comprises a mist discharging fan and a mist discharging pipeline and is used for discharging dispersed salt mist in the test bin; the temperature and humidity monitoring device comprises a plurality of temperature and humidity sensors and is used for monitoring temperature and humidity; the hot air device comprises a hot air blower, a hot air pipeline, an air return channel and a hot air temperature sensor and is used for rapidly increasing the temperature of the test bin; the humidifying device comprises a humidifier and a humidifying pipeline and is used for humidifying the test bin before spraying. The device can improve the uniformity and heating efficiency of the heating space, effectively ensures the temperature stability and uniformity of the test bin, and can be used for the integral alternating salt spray test.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of equipment testing, and particularly relates to a temperature and humidity control system and method, which can be used for whole equipment alternating salt spray test. BACKGROUND

[0002] Salt spray test is a test method for evaluating the adaptability of equipment in the marine atmospheric environment. The existing salt spray test based on samples and parts is not sufficient for testing the salt spray resistance of equipment due to the small test space and easy control of temperature and humidity, which can easily lead to under-test. With the increasing demand for equipment quality, there is an urgent need to carry out whole equipment salt spray test.

[0003] Whole equipment salt spray test requires a large test space. When the whole equipment salt spray test space reaches 360m 3 , it needs to be heated first during the alternating salt spray test, especially at the beginning of the spray. Due to the large test space, it takes a long time to heat to the target temperature. After insulation, the relative humidity of the space is low, and the spray can be started. The salt spray will vaporize during this stage, and the salt spray will absorb the heat of the space during the vaporization process, causing the temperature of the test space to drop significantly. At the same time, the salt spray cannot fully flow during the natural settlement process, and the temperature distribution in the horizontal and vertical directions of the space is uneven. When the short-term sharp drop in temperature and the unevenness of the space exceed the standard error requirements of the laboratory environmental test, it will cause local over-test or under-test of the equipment's salt spray resistance, resulting in reduced reliability of the test results and poor repeatability.

[0004] The patent document with publication number CN 111595769 B discloses an "air heating device for salt spray test box", which includes a heating pipe arranged in the box. The heating pipe is partially or entirely exposed to the air, which has the effect of reducing the impact on the accuracy of the test results. However, this device uses a heating pipe heat radiation method for heating, which has low heating efficiency and long heating time. It can only be used for small salt spray test boxes and is not suitable for large salt spray laboratories with large space for rapid heating.

[0005] The patent document with the publication number CN 101806707 B discloses a "large salt fog environment simulation test system temperature field control method", which includes dividing the relative long side wall or ground of the test space horizontally and vertically, and installing a modular heating device in each sub-grid. Each heating device has an independent temperature control component, which can be adjusted differently according to requirements; the overall temperature control adopts a control step based on model prediction and most prediction. Although this method has the advantages of overall and local temperature adjustment, self-adaptation, and small fluctuation, it has the disadvantages of low heating efficiency, long heating time, and serious impact on test progress, and there is a large temperature drop at the beginning of the spray, which exceeds the error requirement of the laboratory environment test standard. SUMMARY

[0006] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a temperature and humidity control system and method for whole salt spray test, to improve the heating rate of large space temperature during the implementation of whole salt spray test, maintain the temperature constant and uniform distribution at the beginning of the spray, and realize the accurate control of large space temperature fluctuation and uniformity, so that the temperature change of the test space meets the requirements of the test standard.

[0007] To achieve the above purpose, the technical scheme of the present application includes:

[0008] 1. A temperature and humidity control system for whole salt spray test, comprising a test chamber, a test chamber side, a test chamber ground, a heating device, a mist removal device, and a temperature and humidity monitoring device arranged in the test chamber.

[0009] The heating device comprises a boiler, a water inlet pipeline, a circulating water pump, a temperature sensor, a water return pipeline, and a ground heating pipeline, which is used for heating the test chamber.

[0010] The mist removal device comprises a mist removal fan and a mist removal pipeline, which is used for removing the dispersed salt mist in the test chamber.

[0011] The temperature and humidity monitoring device comprises a plurality of temperature and humidity sensors and a protective cover, which is used for monitoring the temperature and humidity.

[0012] Its characteristics are that the test chamber side is additionally provided with a side heating sheet for improving the uniformity and heating efficiency of the heating space; and a hot air device and a humidifying device are additionally provided in the test chamber.

[0013] The hot air device comprises a hot air fan, a hot air pipeline, an air return channel, and a hot air temperature sensor, which is used for rapidly increasing the temperature of the test chamber.

[0014] The humidifying device comprises a humidifier and a humidifying pipeline, which is used for humidifying the test chamber before spraying.

[0015] The humidifying device comprises a humidifier and a humidifying pipeline, which is used for humidifying the test chamber before spraying.

[0016] Further, the boiler is connected with the water inlet pipeline and the water return pipeline respectively, the ground heating pipeline is installed below the ground of the test chamber, the side heating sheet and one end of the ground heating pipeline are connected with the water inlet pipeline, and the other end is connected with the water return pipeline, the circulating water pump and the temperature sensor are installed on the water inlet pipeline, and the heating of the test chamber is completed.

[0017] Further, one end of the hot air pipeline and the air return pipeline is connected with the heating fan, and the other end is connected with the test chamber; the hot air temperature sensor is installed on the hot air pipeline, and the rapid temperature rise of the test chamber is completed.

[0018] Further, the humidifier is connected to the upper end of the test chamber through the humidification pipeline, so as to humidify the test chamber before the start of spraying, and avoid the temperature from dropping sharply after the start of spraying.

[0019] Further, the mist exhaust fan is installed on the mist exhaust pipeline, one end of the mist exhaust pipeline is installed on the upper part of the test chamber, and the other end is installed outside the test chamber, so as to exhaust the dispersed salt mist in the test chamber.

[0020] Further, the temperature and humidity sensor is hung on the side of the test chamber, and the protective cover is installed outside the sensor, so as to complete the real-time monitoring of the temperature and humidity in the test chamber.

[0021] 2. A method for temperature and humidity control using the above system, characterized in that it comprises:

[0022] S1) Start stage of whole set alternating salt spray test:

[0023] The boiler is started to heat the circulating water, and the circulating water pump is started to inject hot water into the ground heating pipeline of the salt spray chamber ground and the side heating sheet of the salt spray chamber side through the water inlet pipeline, so as to heat and warm up the test chamber;

[0024] The hot air fan (11) is started, and the hot air formed by the hot air fan (11) is injected into the test chamber (1) through the hot air pipeline (12), so as to quickly raise the temperature of the test chamber and keep the temperature after reaching the set temperature;

[0025] S2) First spraying stage:

[0026] After the temperature rise and temperature keeping are completed, the humidifier (15) is started, the humid air enters the test chamber (1) through the humidification pipeline (16), the humidification is stopped when the humidity reaches 85% RH, the spraying is started to the set time, and the first stage spraying is completed;

[0027] S3) First temperature keeping stage:

[0028] After the end of spraying, the mist exhaust fan (19) is started to quickly exhaust the salt mist dispersed in the test chamber through the mist exhaust pipeline (20), and the hot air fan (11) is started to keep the temperature at 15℃~35℃ through the hot air heating device to the set time;

[0029] S4) Second spraying stage:

[0030] After the first temperature maintaining stage, the second spraying stage is entered, and the operation is the same as the first spraying stage;

[0031] S5) Second temperature maintaining stage:

[0032] After the second spraying stage, the second temperature maintaining stage is entered, and the operation is the same as the first temperature maintaining stage;

[0033] S6) The above spraying and temperature maintaining process is cycled until the test requirements of temperature and humidity are reached.

[0034] Compared with the prior art, the present application has the following advantages:

[0035] Firstly, the present application is provided with a hot air device in the test chamber, so that the temperature of the test chamber can be quickly raised in the heating stage, effectively overcoming the slow heating speed of the conventional heating device, and greatly improving the test efficiency;

[0036] Secondly, the present application is provided with a humidifying device in the test chamber, so that the humidity of the air in the test chamber can be quickly raised at the beginning of the spraying stage of the alternating salt mist test, avoiding the rapid temperature drop caused by the heat absorption of salt mist vaporization, effectively ensuring the stability and uniformity of the temperature in the test chamber, and avoiding the temperature deviation in the test;

[0037] Thirdly, the present application is provided with side heating fins on the heating device, which can improve the uniformity and heating efficiency of the heating space;

[0038] Fourthly, the present application adopts a modular temperature and humidity control system composed of a heating device, a hot air device, a humidifying device, a mist exhaust device and a temperature and humidity monitoring device, which greatly improves the stability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structure diagram of the temperature and humidity control system of the present application;

[0040] Figure 2 is a structure diagram of the heating device in the system of the present application;

[0041] Figure 3 is a structure diagram of the hot air device in the system of the present application;

[0042] Figure 4 is a structure diagram of the humidifying device in the system of the present application;

[0043] Figure 5 The structure diagram of the mist discharging device in the system of the present application;

[0044] Figure 6 The structure diagram of the temperature and humidity monitoring device in the system of the present application;

[0045] Figure 7 The flow chart of the temperature and humidity control method of the present application;

[0046] Figure 8 The result chart of the temperature and humidity control of the present application;

[0047] Figure 9 The control effect chart of the humidification and spray temperature drop of the present application. DETAILED DESCRIPTION

[0048] In order for those skilled in the art to better understand the present application, the technical solutions and effects in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, other embodiments obtained by those skilled in the art without creative labor should be within the protection scope of the present application.

[0049] Embodiment one, temperature and humidity control system for whole equipment alternating salt spray test

[0050] The present embodiment is used in the use scene of whole equipment alternating salt spray test, and the object is whole equipment such as armored vehicles, and the salt spray test implementation space needs to reach 360m 3 The alternating salt spray test is implemented for 24h spray, 24h drying is one cycle, and multiple cycles are carried out according to needs. In order to avoid the occurrence of under-test and over-test, the whole equipment alternating salt spray test needs to ensure the stability and uniformity of the temperature and humidity of the large space, and the reliability and continuity of the long-time temperature and humidity control.

[0051] Referring to Figure 1 The temperature and humidity control system of the present embodiment comprises a test bin 1, a boiler 2, a water inlet pipeline 3, a circulating water pump 4, a waterway temperature sensor 5, a water return pipeline 6, a test bin side surface 7, multiple side surface heating sheets 8, a test bin ground surface 9, a ground surface heating pipeline 10, a hot air blower 11, an air inlet pipeline 12, an air return channel 13, a hot air temperature sensor 14, a humidifier 15, a humidification pipeline 16, multiple temperature and humidity sensors 17, a protective cover 18, a mist discharging fan 19, and a mist discharging pipeline 20.

[0052] Referring to Figure 2, the boiler 2, the water inlet pipeline 3, the circulating water pump 4, the temperature sensor 5, the backwater pipeline 6, the side heating sheet 8, the ground heating pipeline 10 form a heating device. Wherein the boiler 2 is connected with the water inlet pipeline 3 and the backwater pipeline 6, the side heating sheet 8 is installed on the test chamber side 7, the ground heating pipeline 10 is installed below the test chamber ground 9, one end of the side heating sheet 8 and the ground heating pipeline 10 is connected with the water inlet pipeline 3, the other end is connected with the backwater pipeline 6, the circulating water pump 4 and the temperature sensor 5 are installed on the water inlet pipeline 3. The surface of the side heating sheet 8 is treated with anticorrosion to meet the long-term use in the salt spray environment in the test chamber 1. The height of the side heating sheet 8 is 1m, the width is 1.5m, the interval is 1m, the distance from the ground is 1m, hot water is circulated in the heating sheet, and the temperature of the hot water is controlled at 35~65 DEG C. The length of the ground heating pipeline 10 is 10mm, the interval is 500mm, the distance from the ground is 100mm, and the temperature of the hot water in the pipeline is controlled at 35~65 DEG C. The heating device is installed in the test chamber 1, and is used for completing the uniform heating of the test chamber space and improving the heating efficiency.

[0053] With reference to Figure 3 , the hot air machine 11, the hot air pipeline 12, the back air passage 13 and the hot air temperature sensor 14 form a hot air device. Wherein one end of the air inlet pipeline 12 is connected with the heating air machine 11, the other end is connected to the test chamber 1, one end of the back air pipeline 13 is connected with the heating air machine 11, the other end is connected to the test chamber 1, and the air inlet pipeline 12 is provided with the hot air temperature sensor 14. The hot air device is installed in the test chamber 1, and is used for rapidly increasing the temperature of the test chamber.

[0054] With reference to Figure 4 , the humidifier 15 and the humidification pipeline 16 form a humidification device. The humidifier 15 is arranged outside the test chamber, is connected with the humidification pipeline 16, and the humidification pipeline 16 is connected to the upper end of the test chamber 1. The humidification pipeline 16 is used for guiding the humid air into the test chamber 1, and the humidification of the test chamber before spraying is completed.

[0055] With reference to Figure 5 , the mist exhaust fan 19 and the mist exhaust pipeline 20 form a mist exhaust device. One end of the mist exhaust pipeline 19 is installed on the upper part of the test chamber 1, the other end is installed outside the test chamber, and the mist exhaust fan 20 is installed on the mist exhaust pipeline.

[0056] With reference to Figure 6 , the temperature and humidity sensor 17 and the protective cover 18 form a temperature and humidity monitoring device. The temperature and humidity sensor 17 is hung in the test chamber, and the protective cover 18 is installed on the temperature and humidity sensor 17. The temperature and humidity sensor 17 is arranged on both sides of the large-scale salt spray test chamber, and the parameters are set but not limited to 0.5m from the side, 1.5m from the ground, and 2m apart. The temperature and humidity sensor 17 is provided with a protective sleeve in the spraying stage, so that the humidity sensor probe is prevented from being corroded and damaged by the salt spray environment, and is used for the temperature and humidity control system of the whole salt spray test

[0057] Embodiment two, the method for temperature and humidity control in the whole package alternating salt spray test

[0058] Reference Figure 7 The method for temperature and humidity control in the whole package alternating salt spray test by using the above system, the implementation includes the following:

[0059] Step one, start the temperature rising stage.

[0060] At the beginning of the whole package alternating salt spray test, the temperature needs to be quickly raised to the target temperature 35℃, the boiler 2 is started to heat the circulating water, the circulating water pump 4 is started to inject hot water into the ground heating pipe 10 of the salt spray chamber ground 9 and the side heating piece 8 of the salt spray chamber side 7 through the water inlet pipeline 3, in order to quickly realize temperature rising, the hot air fan 11 is started to blow hot air into the test chamber 1 through the hot air pipeline 12, so as to quickly realize temperature rising to 35℃±2℃, the hot air fan 11 is closed, and the side heating piece 8 and the ground heating pipe 10 are used to keep the temperature stable, and the temperature is kept for 2h~4h;

[0061] Step two, first spraying stage.

[0062] After temperature rising and keeping, the first spraying stage is entered, before spraying starts, the humidifier 15 is first opened, and the wet air enters the test chamber 1 through the humidification pipeline 16, by humidifying the dry air in the test chamber 1, the heat absorption of salt mist droplet evaporation can be effectively avoided, and the temperature in the test chamber space is prevented from rapidly dropping, when the humidity reaches 85%RH, the humidification is stopped, the spraying stage is started, and the spraying is started for 24h, and the first stage spraying is completed.

[0063] Step three, first temperature keeping stage.

[0064] After spraying, the first temperature keeping stage is entered, the mist exhaust fan 19 is first started, the diffused salt mist in the test chamber is quickly exhausted through the mist exhaust pipeline 20, and the hot air fan 11 is started to keep the temperature at 15℃~35℃ through the hot air heating device, and the temperature is kept for 24h.

[0065] Step four, second spraying stage.

[0066] After the first temperature keeping stage is ended, the second spraying stage is carried out according to the same operation as the first spraying stage.

[0067] Step five, second temperature keeping stage.

[0068] After the second spraying stage is ended, the second temperature keeping stage is carried out according to the same operation as the first temperature keeping stage.

[0069] Step six, cycle stage.

[0070] The above spraying stage and the holding stage are cyclically performed until the test requirements of temperature and humidity are reached.

[0071] Without special test requirements, the spraying and holding of the whole salt spray test are usually performed for two cycles, and the temperature and humidity control curves of the two cycle periods are as shown in Figure 8 .

[0072] The effects of the present application can be further illustrated by the following test experiments:

[0073] I. Test conditions

[0074] The whole salt spray test chamber space is set to be 13.5 m long, 6 m wide, and 5 m high, and is provided with a heating device, a hot air device, a humidifying device, a mist exhaust device, and a temperature and humidity monitoring device.

[0075] In order to compare the heating efficiency improvement effect of the hot air device on the salt spray test chamber, the following two test conditions are set to compare the heating effects.

[0076] Test condition 1: Considering the temperature loss in the hot water circulation process, the boiler is started to heat the circulating water to 50±2℃, and the circulating water pump is started to inject hot water into the ground heating pipe on the floor of the salt spray chamber and the side heating sheet on the side of the salt spray chamber through the water inlet pipeline, so as to heat and warm up the test chamber.

[0077] Test condition 2: The boiler is started to heat the circulating water to 50±2℃, and the circulating water pump is started to inject hot water into the ground heating pipe on the floor of the salt spray chamber and the side heating sheet on the side of the salt spray chamber through the water inlet pipeline, so as to heat and warm up the test chamber, and at the same time, the hot air fan is started to assist the rapid warming up of the test chamber.

[0078] In order to compare the temperature reduction control effect of the humidifying device on the salt spray test chamber, the following two test conditions are set to compare the heating effects.

[0079] Test condition 3: After the holding stage ends, the spraying is directly started, and the temperature and humidity sensor is used to monitor the real-time information of the temperature and humidity in the test chamber.

[0080] Test condition 4: After the holding stage ends, the humidifier is started, the humidified air enters the test chamber through the humidifying pipeline, when the humidity reaches 85% RH, the humidification is stopped, the spraying is started, and the temperature and humidity sensor is used to monitor the real-time information of the temperature and humidity in the test chamber.

[0081] II. Detection content

[0082] Under the above test conditions, the temperature and humidity variation trends in the test chamber are detected, and the results are as follows:

[0083] For the whole set of salt spray test chamber space provided by the application, when the room temperature is about 10 DEG C in winter, the test condition 1 is heated by ground and side heat radiation and heat conduction, and the circulating test lasts for 8 hours, so that the temperature of the test chamber space reaches 35 DEG C. The test condition 2 is heated by the auxiliary convection of the hot air blower, and the temperature of the test chamber space reaches 35 DEG C in 30±5 minutes, and after the temperature rises, the temperature is maintained for 2-4 hours, the hot air blower is turned off during the temperature maintaining stage, the boiler is turned on, the temperature of the circulating water is unchanged, the circulating water pump is turned on to maintain the ground heating and the side heating, so as to compensate the loss of the temperature during the test.

[0084] For the whole set of salt spray test chamber space provided by the application, after the temperature maintaining ends, the humidity in the test chamber is 15±5% RH, the temperature of the test condition 3 directly sprayed drops sharply, and the drop amplitude reaches 6.5 DEG C, which exceeds the standard required temperature fluctuation value. The temperature of the test condition 4 drops very little after humidification for 10±2 minutes, and the temperature drop is within 2 DEG C, and the space temperature distribution is uniform, and the difference is within 1 DEG C. Figure 9 is a comparison chart of the temperature change trend of the test condition 3 and the test condition 4.

[0085] From the above test results, it can be seen that the application solves the temperature control of the whole set of alternating salt spray test at the beginning of the spraying, and the temperature fluctuation and uniformity meet the standard requirements.

[0086] The above description is only one specific example of the application, and does not constitute any limitation on the application. Obviously, for those skilled in the art, after understanding the content and principles of the application, various modifications and changes in form and details can be made without departing from the principles and structures of the application, for example, one end of the mist discharge pipeline of the example is installed in the upper part of the test chamber, and the other end of the mist discharge pipeline can be designed to be installed in the middle or lower part of the test chamber; the humidification pipeline is connected to the upper end of the test chamber, and the humidification pipeline can be designed to be connected to the middle or lower end of the test chamber; however, these modifications and changes based on the idea of the application are still within the protection scope of the claims of the application.

Claims

1. A temperature and humidity control system for a complete set alternating salt spray test, comprising a test chamber (1), a test chamber side (7), The test chamber floor (9) is provided with a heating device, a mist exhaust device, and a temperature and humidity monitoring device in the test chamber (1); The heating device comprises a boiler (2), a water inlet pipe (3), a circulating water pump (4), a temperature sensor (5), a return water pipe (6), and a ground heating pipe (10), and is used to heat the test chamber (1); The mist exhaust device includes a mist exhaust fan (19) and a mist exhaust pipe (20), which are used to exhaust the salt mist dispersed in the test chamber; The temperature and humidity monitoring device comprises a plurality of temperature and humidity sensors (17) and a protective cover (18), and is used to monitor temperature and humidity; Its characteristics are: A side heating plate (8) is provided on the side (7) of the test chamber to improve the uniformity and heating efficiency of the heating space; a hot air device and a humidifying device are additionally provided in the test chamber; The hot air device comprises a hot air blower (11), a hot air duct (12), a return air channel (13) and a hot air temperature Sensor (14) for quickly raising the temperature of the test chamber The humidifying device comprises a humidifier (15) and a humidifying pipe (16), and is used to humidify the test chamber before spraying.

2. The system according to claim 1, wherein: The boiler (2) is connected to the water inlet pipe (3) and the return water pipe (6) respectively. The floor heating pipe (10) is installed below the floor (9) of the test chamber. One end of the side heating plate (8) and the floor heating pipe (10) is connected to the water inlet pipe (3), and the other end is connected to the return water pipe (6). The circulating water pump (4) and the temperature sensor (5) are installed on the water inlet pipe (3) to complete the heating of the test chamber.

3. The system according to claim 1, wherein: One end of the hot air duct (12) and the return air duct (13) are both connected to the heating fan (11), and the other end is connected to the test chamber (1); the hot air temperature sensor (14) is installed on the hot air duct (12) to quickly increase the temperature of the test chamber.

4. The system according to claim 1, wherein: The humidifier (15) is connected to the upper end of the test chamber (1) via a humidifying pipe (16) to humidify the test chamber before spraying begins, thereby preventing a significant drop in temperature after spraying begins.

5. The system according to claim 1, wherein: The demisting fan (20) is installed on the demisting pipe (19), one end of which is installed on the upper part of the test chamber (1), and the other end of which is installed outside the test chamber to remove the salt mist dispersed in the test chamber.

6. The system according to claim 1, wherein: The temperature and humidity sensor (17) is suspended on the side of the test chamber (7), and a protective cover (18) is installed on the outside of the sensor to complete real-time monitoring of the temperature and humidity in the test chamber.

7. A method for controlling temperature and humidity using the system of claim 1, characterized in that: include: S1) Initial stage of the whole-unit alternating salt spray test: Start the boiler (2) to heat the circulating water, start the circulating water pump (4) to inject the hot water into the ground heating pipe (10) of the salt spray chamber floor (9) and the side heating plate (8) of the salt spray chamber side (7) through the water inlet pipe (3), and heat the test chamber (1); Turn on the hot air blower (11) and inject the hot air generated by the hot air blower into the test chamber (1) through the hot air duct (12) to quickly increase the temperature of the test chamber to a set temperature and then keep it warm; S2) First spray stage: After the heating and holding is completed, the humidifier (15) is turned on, and the humidified air enters the test chamber (1) through the humidification pipe (16). When the humidity reaches 85%RH, the humidification is stopped, and the spraying is started for the set time, completing the first stage of spraying; S3) First insulation stage: After the spraying is completed, the exhaust fan (19) is turned on to quickly exhaust the salt mist dispersed in the test chamber through the exhaust pipe (20), and at the same time, the hot air blower (11) is turned on to maintain the temperature at 15°C~35°C through the hot air heating device for a set time; S4) Second spray phase: After the first heat preservation stage, the second spraying stage begins, and its operation is the same as the first spraying stage; S5) Second insulation stage: After the second spraying stage, the second heat preservation stage begins, and the operation is the same as the first heat preservation stage; S6) Repeat the above spraying and heat preservation process until the test requirements of temperature and humidity are met.

8. The method according to claim 7, characterized in that The heating temperature of the test chamber (1) is set to 35±2℃ and kept warm for 2h~4h.

9. The method according to claim 7, characterized in that: The spraying time and the heat preservation time of each stage are both 24 hours.

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