A temperature and humidity control system for a whole package alternate salt spray test

Abstract

The utility model discloses a temperature and humidity control system for whole salt spray test, mainly solves the problem of slow heating rate, big temperature fluctuation and poor uniformity in the implementation process of the existing whole salt spray test. The test bin is provided with: boiler and inlet and return water pipeline, side heating sheet, ground heating pipeline, hot air blower and its inlet and return air pipeline, humidifier and its humidification pipeline, mist exhaust fan and its mist exhaust pipeline, various sensors. The both ends of the heating sheet and ground heating pipeline are connected with the inlet and return water pipeline of the boiler respectively, and the heating of the test bin is completed together, the both ends of the inlet and return air pipeline are connected with the heating air blower and the test bin respectively to improve the temperature of the test bin quickly, the humidifier is connected to the upper end of the test bin through the humidification pipeline to humidify the test before spraying, and various sensors provide temperature and humidity data of the experimental process in real time. The utility model can improve the uniformity and heating efficiency of the heating space, effectively guarantee the temperature stability and uniformity of the test bin, and can be used for whole salt spray test.

Description

Technical Field

[0001] This utility model belongs to the field of equipment testing technology, and specifically relates to a temperature and humidity control system that can be used for integrated alternating salt spray testing. Background Technology

[0002] This is a testing method for assessing the adaptability of equipment to marine atmospheric environments. Existing salt spray testing methods based on samples and components are insufficient for adequately evaluating the equipment's salt spray resistance due to the limited testing space and ease of temperature and humidity control. This can easily lead to under-testing. As equipment quality requirements become increasingly stringent, there is an urgent need to develop integrated salt spray testing methods.

[0003] Fully assembled salt spray testing requires a large testing space; when the testing space reaches 360m... 3 During alternating salt spray tests, especially at the beginning of the spraying process, the space needs to be heated first. Due to the large size of the test space, it takes a long time to reach the target temperature. Spraying can only begin after the relative humidity of the space is low following the heat preservation. At this stage, the sprayed salt spray will vaporize, and the salt spray will absorb heat from the space during the vaporization process, causing the temperature of the test space to drop significantly in an instant. At the same time, the salt spray cannot flow sufficiently during the natural settling process, resulting in uneven temperature distribution in the horizontal and vertical directions of the space. When this rapid drop in temperature and unevenness in the space exceed the standard error requirements of the laboratory environment test, it will cause local overtesting or undertesting of the equipment's salt spray adaptability assessment, resulting in reduced reliability and poor repeatability of the test results.

[0004] Patent document CN 111595769 B discloses an "air heating device for a salt spray test chamber," which includes a heating tube installed inside the chamber, with the heating tube partially or completely exposed to the air, thus reducing the impact on the accuracy of test results. However, because this device uses thermal radiation from the heating tube, its heating efficiency is low, the heating time is long, and it can only be used in small salt spray test chambers, not in large salt spray laboratories for rapid heating in large spaces.

[0005] Patent document CN 101806707 B discloses a "temperature field control method for a large-scale salt spray environment simulation test system," which includes dividing the test space into horizontal and vertical sections along its relatively long sidewalls or the ground, and installing a modular heating device in each section. Each heating device has an independent temperature control component, allowing for differentiated temperature adjustments as required; the overall temperature control employs a control step based on model prediction and best prediction. While this method possesses advantages such as overall and local temperature field adjustment capabilities, adaptability, and low fluctuation, it also suffers from drawbacks such as low heating efficiency, long heating time, which severely impacts the test progress, and a significant temperature drop at the beginning of the spraying phase, exceeding the standard error requirements of laboratory environmental tests. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the prior art by providing a temperature and humidity control system for integrated alternating salt spray testing, thereby improving the heating rate of the large space temperature during the integrated salt spray test, maintaining a constant and uniform temperature distribution at the beginning of the spraying stage, and achieving precise control over the temperature fluctuations and uniformity of the large space.

[0007] The key technology to achieve the above objectives is to add a hot air device, a humidification device, and heating elements to the existing test chamber. The technical solution is as follows:

[0008] 1. A temperature and humidity control system for integrated alternating salt spray testing, comprising a test chamber 1, a test chamber side 7, and a test chamber floor 9, wherein the test chamber 1 is equipped with a boiler 2, a water inlet pipe 3, a circulating water pump 4, a water temperature sensor 5, a return water pipe 6, the salt spray chamber side 7, a floor heating pipe 10, multiple temperature and humidity sensors 17, a protective cover 18, an exhaust fan 19, and an exhaust pipe 20, characterized in that:

[0009] Side heating elements 8 are installed on the side 7 of the test chamber to improve the uniformity of the heating space and the heating efficiency.

[0010] The test chamber 1 is also equipped with a hot air blower 11, an air inlet pipe 12, an air return channel 13, a hot air temperature sensor 14, a humidifier 15, and a humidification pipe 16.

[0011] The air inlet duct 12 and the air return duct 13 are both connected at one end to the heating fan 11 and at the other end to the test chamber 1, so as to quickly increase the temperature of the test chamber.

[0012] The humidifier 15 is connected to the upper end of the test chamber 1 via a humidification pipe 16 to humidify the test chamber before spraying, thus preventing a significant drop in temperature after spraying begins.

[0013] Preferably, both the inlet pipe 3 and the return pipe 6 are connected to the boiler 2, forming a hot water circulation path under the action of the circulating water pump 4.

[0014] Preferably, the ground heating pipe 10 is installed under the ground (9) of the test chamber, and one end of it and the side heating plate 8 are both connected to the water inlet pipe 3, and the other end of them are both connected to the water return pipe (6) to jointly complete the heating of the test chamber.

[0015] Preferably, the circulating water pump 4 and the temperature sensor 5 are both installed on the water inlet pipe (3) to monitor the temperature inside the air inlet pipe 12 in real time.

[0016] Preferably, the defogging fan 20 is installed on the defogging duct 19, with one end of the duct installed at the top of the test chamber and the other end installed outside the test chamber, in order to remove the salt spray diffused inside the test chamber.

[0017] Preferably, the multiple temperature and humidity sensors 17 are suspended on the side 7 of the test chamber, and a protective cover (18) is installed on the outside of the sensor to complete the real-time monitoring of the temperature and humidity inside the test chamber.

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] First, because the present invention has a hot air blower, an air inlet pipe and a return air channel installed in the test chamber, the temperature of the test chamber can be raised quickly during the heating stage, which greatly improves the test efficiency.

[0020] Secondly, by adding a humidifier 15 and a humidification pipe 16 to the test chamber to humidify the test chamber before spraying, this utility model can avoid a significant drop in temperature after spraying begins.

[0021] Thirdly, this utility model improves the uniformity of the heating space and the heating efficiency by adding side heating plates to the heating transfer position. Attached Figure Description

[0022] Figure 1 This is a structural diagram of the temperature and humidity control system of this utility model;

[0023] Figure 2 This is a structural diagram of the heating device in the system of this utility model;

[0024] Figure 3 This is a structural diagram of the hot air device in the system of this utility model;

[0025] Figure 4 This is a structural diagram of the humidification device in the system of this utility model;

[0026] Figure 5 This is a structural diagram of the defogging device in the system of this utility model;

[0027] Figure 6 This is a structural diagram of the temperature and humidity monitoring device in the system of this utility model;

[0028] Figure 7 This is a diagram showing the temperature and humidity control results of this utility model;

[0029] Figure 8 This diagram illustrates the effect of humidification on the temperature drop of the spray in this invention. Detailed Implementation

[0030] The embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0031] This implementation describes a scenario for integrated alternating salt spray testing, targeting armored vehicles and other complete equipment, requiring a space of at least 360m² for the salt spray test. 3 The alternating salt spray test is conducted by spraying for 24 hours and drying for 24 hours as one cycle, and multiple cycles are carried out as needed. To avoid under-testing and over-testing, the overall alternating salt spray test needs to ensure the stability and uniformity of temperature and humidity in a large space, as well as the reliability and continuity of temperature and humidity control over a long period of time.

[0032] Reference Figure 1 The temperature and humidity control system in this example includes a test chamber 1, a boiler 2, an inlet water pipe 3, a circulating water pump 4, a water temperature sensor 5, a return water pipe 6, a side of the test chamber 7, multiple side heating elements 8, a test chamber floor 9, a floor heating pipe 10, a hot air blower 11, an air inlet pipe 12, a return air channel 13, a hot air temperature sensor 14, a humidifier 15, a humidification pipe 16, multiple temperature and humidity sensors 17, a protective cover 18, an exhaust fan 19, and an exhaust pipe 20.

[0033] Reference Figure 2 The heating device comprises a boiler 2, an inlet pipe 3, a circulating water pump 4, a temperature sensor 5, a return water pipe 6, side heating elements 8, and a ground heating pipe 10. The boiler 2 is connected to the inlet pipe 3 and the return water pipe 6. The side heating elements 8 are installed on the side of the test chamber 7, and the ground heating pipe 10 is installed below the floor 9 of the test chamber. One end of each side heating element 8 and ground heating pipe 10 is connected to the 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 inlet pipe 3. The surface of the side heating elements 8 is treated with anti-corrosion coating to meet long-term use in the salt spray environment of the test chamber 1. The side heating elements 8 are 1m high, 1.5m wide, spaced 1m apart, and 1m above the ground. Hot water flows inside the heating elements, and the hot water temperature is controlled between 35℃ and 65℃. The ground heating pipe 10 is 10mm long, spaced 500mm apart, and 100mm above the ground. The internal hot water temperature is controlled between 35℃ and 65℃. The heating device is installed inside the test chamber 1 to achieve uniform heating of the test chamber space and improve heating efficiency.

[0034] Reference Figure 3 The hot air blower 11, hot air duct 12, return air duct 13, and hot air temperature sensor 14 constitute a hot air device. One end of the inlet duct 12 is connected to the heating blower 11, and the other end is connected to the test chamber 1. One end of the return air duct 13 is connected to the heating blower 11, and the other end is connected to the test chamber 1. The hot air temperature sensor 14 is installed in the inlet duct 12. This hot air device is installed inside the test chamber 1 to rapidly increase the temperature of the test chamber.

[0035] Reference Figure 4The humidifier 15 and the humidification pipe 16 constitute a humidification device. The humidifier 15 is deployed outside the test chamber and connected to the humidification pipe 16. The humidification pipe 16 is connected to the upper end of the test chamber 1. Humid air is introduced into the test chamber 1 through the humidification pipe 16 to complete the humidification of the test chamber before spraying.

[0036] Reference Figure 5 The de-fogging fan 19 and the de-fogging pipe 20 constitute a de-fogging device. One end of the de-fogging pipe 19 is installed on the upper part of the test chamber 1, and the other end is installed outside the test chamber. The de-fogging fan 20 is installed on the de-fogging pipe to remove the salt spray diffused inside the test chamber.

[0037] Reference Figure 6 The multiple temperature and humidity sensors 17 and the protective cover 18 constitute a temperature and humidity monitoring device; these temperature and humidity sensors 17 are suspended on both sides inside the test chamber. The distance parameters between the temperature and humidity sensors and the sides are set to, but not limited to, 0.5m, 1.5m from the ground, and 2m between each other; these temperature and humidity sensors 17 are equipped with protective covers 18 during the spraying stage to prevent the humidity sensor probes from being corroded and damaged by the salt spray environment.

[0038] The working principle of this utility model is as follows:

[0039] At the beginning stage of the integrated alternating salt spray test, the temperature needs to reach the target temperature of 35℃ quickly. Boiler 2 is turned on to heat the circulating water, and circulating water pump 4 is turned on to inject 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. In order to achieve rapid temperature rise, hot air blower 11 is turned on to blow hot air into the test chamber 1 through hot air pipe 12 to achieve a rapid temperature of 35℃±2℃. Hot air blower 11 is turned off, and the side heating plate 8 and ground heating pipe 10 are used to maintain the temperature stability for 2h~4h.

[0040] After the heating and heat preservation are completed, the first spraying stage begins. Before the spraying starts, the humidifier 15 is turned on to allow humid air to enter the test chamber 1 through the humidification pipe 16. By humidifying the dry air in the test chamber 1, the evaporation and heat absorption of salt spray droplets can be effectively avoided, and the temperature in the test chamber space can be prevented from dropping rapidly. When the humidity reaches 85%RH, humidification is stopped and the spraying stage is started. Spraying continues for the set 24 hours to complete the first stage of spraying.

[0041] After the spraying is completed, the first heat preservation stage begins. First, the de-fogging fan 19 is turned on to quickly empty the salt spray in the test chamber through the de-fogging pipe 20. At the same time, the hot air fan 11 is turned on to maintain the temperature at 15℃~35℃ through the hot air heating device for 24 hours.

[0042] After the first heat preservation stage is completed, proceed with the second spraying stage using the same procedures as the first spraying stage.

[0043] After the second spraying stage is completed, the second insulation stage will be carried out in the same manner as the first insulation stage.

[0044] This process is repeated, alternating between the spraying and heat preservation stages, until the required temperature and humidity are met.

[0045] This example provides temperature and humidity control curves for two cycles, such as... Figure 7 As shown.

[0046] The effectiveness of this invention can be further illustrated by the following test experiments:

[0047] I. Test Conditions

[0048] The prefabricated salt spray test chamber is 13.5m long, 6m wide, and 5m high. It is equipped with one heating device, one hot air device, one humidification device, one defogging device, and one temperature and humidity monitoring device.

[0049] To compare the efficiency of the hot air device in improving the heating efficiency of the salt spray test chamber, the following two test conditions were set up to compare the heating effects.

[0050] Test Condition 1: Considering the temperature loss during hot water circulation, the boiler was turned on to heat the circulating water to 50±2℃, and the circulating water pump was turned on to inject hot water into the ground heating pipes on the ground of the salt spray chamber and the side heating plates on the side of the salt spray chamber through the inlet pipe to heat the test chamber.

[0051] Test Condition 2: Turn on the boiler to heat the circulating water to 50±2℃, turn on the circulating water pump to inject hot water into the ground heating pipes on the ground of the salt spray chamber and the side heating plates on the side of the salt spray chamber through the water inlet pipe to heat the test chamber. At the same time, turn on the hot air fan to assist in the rapid heating of the test chamber.

[0052] To compare the effect of humidification on reducing the controlled temperature in the salt spray test chamber, the following two test conditions were set up to compare the heating effect.

[0053] Test condition 3: After the heat preservation stage is completed, spraying will begin directly, and the temperature and humidity information in the test chamber will be monitored in real time by temperature and humidity sensors.

[0054] Test Condition 4: After the heat preservation stage is completed, the humidifier is turned on and humid air enters the test chamber through the humidification pipe. When the humidity reaches 85%RH, humidification is stopped and spraying begins. The temperature and humidity information in the test chamber is monitored in real time by the temperature and humidity sensor.

[0055] II. Testing Content

[0056] Under the above experimental conditions, the trends in temperature and humidity within the test chamber were detected, and the results are as follows:

[0057] For the prefabricated salt spray test chamber space set up in this utility model, when the room temperature in winter is about 10℃, test condition 1 uses ground and side thermal radiation and heat conduction for heating, and the cycle test lasts for 8 hours to achieve a test chamber space temperature of 35℃. Test condition 1 uses hot air fan assisted convection heating, and the test chamber space temperature can reach 35℃ in 30±5 minutes. After the heating is completed, the heat preservation begins, and the heat preservation generally lasts for 2~4 hours. During the heat preservation stage, the hot air fan is turned off, the boiler is kept on, the hot circulating water temperature remains unchanged, and the circulating water pump is turned on to maintain ground heating and side heating to make up for the temperature loss during the test.

[0058] Regarding the prefabricated salt spray test chamber space designed in this utility model, after the insulation period, the humidity inside the test chamber is 15±5%RH. Under test condition 3, the temperature drops sharply with direct spraying, reaching a decrease of 6.5℃, exceeding the temperature fluctuation value required by the standard. Under test condition 4, after humidifying for 10±2 minutes before spraying, the temperature drop is very small, within 2℃, and the temperature distribution in the space is relatively uniform, with a difference within 1℃. Figure 8 This is a comparison chart of temperature change trends collected under test conditions 3 and 4.

[0059] The experimental results above show that this invention can effectively solve the temperature control problem at the beginning stage of the alternating salt spray test, ensuring that the temperature fluctuation and uniformity meet the standard requirements.

[0060] The above description is merely a specific example of this utility model and does not constitute any limitation on this utility model. Obviously, those skilled in the art, after understanding the content and principle of this utility model, may make various modifications and changes in form and details without departing from the principle and structure of this utility model. For example, in this example, one end of the mist exhaust pipe is installed at the upper part of the test chamber, but it can also be designed so that one end of the mist exhaust pipe is installed at the middle or lower part of the test chamber; the humidification pipe is connected to the upper end of the test chamber, but it can also be designed so that the humidification pipe is connected to the middle or lower end of the test chamber. However, these modifications and changes based on the concept of this utility model are still within the protection scope of the claims of this utility model.

Claims

1. A temperature and humidity control system for a complete alternating salt spray test, comprising a test chamber (1) and a side panel (7) of the test chamber. The test chamber floor (9), the test chamber (1) is equipped with a boiler (2), water inlet pipe (3), circulating water pump (4), water temperature sensor (5), return water pipe (6), salt spray chamber side (7), ground heating pipe (10), multiple temperature and humidity sensors (17), protective cover (18), de-fogging fan (19), de-fogging pipe (20), and is characterized by: Side heating plates (8) are installed on the side (7) of the test chamber to improve the uniformity of the heating space and the heating efficiency. The test chamber (1) is also equipped with a hot air blower (11), an air inlet pipe (12), an air return channel (13), a hot air temperature sensor (14), a humidifier (15), and a humidification pipe (16). The air inlet duct (12) and the air return duct (13) are connected at one end to the heating fan (11) and at the other end to the test chamber (1) to quickly raise the temperature of the test chamber; The humidifier (15) is connected to the upper end of the test chamber (1) via a humidification pipe (16) to humidify the test chamber before spraying, so as to avoid a significant drop in temperature after spraying begins.

2. The system according to claim 1, characterized in that: The hot air temperature sensor (14) is installed inside the air inlet duct (12) to monitor the temperature inside the air inlet duct (12) in real time.

3. The system according to claim 1, characterized in that: Both the inlet pipe (3) and the return pipe (6) are connected to the boiler (2) to form a hot water circulation path.

4. The system according to claim 1, characterized in that: The ground heating pipe (10) is installed under the ground (9) of the test chamber. One end of the pipe and the side heating plate (8) are connected to the water inlet pipe (3), and the other end is connected to the water return pipe (6) to jointly heat the test chamber.

5. The system according to claim 1, characterized in that, The circulating water pump (4) and temperature sensor (5) are both installed on the inlet pipe (3) to monitor the temperature inside the inlet pipe (3).

6. The system according to claim 1, characterized in that: The de-fogging fan (19) is installed on the de-fogging pipe (20), one end of which is installed on the upper part of the test chamber (1) and the other end is installed outside the test chamber to remove the salt spray diffused inside the test chamber.

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

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