Programmable low-humidity control constant-temperature and constant-humidity test box and temperature and humidity adjusting method thereof

Abstract

The invention discloses a programmable low-humidity control constant-temperature and constant-humidity test box and a temperature and humidity adjusting method thereof.The programmable low-humidity control constant-temperature and constant-humidity test box comprises a box body, a working chamber, a temperature and humidity adjusting system, a low-humidity strengthening module, a control system and an airflow circulating system; the temperature and humidity adjusting system, the low-humidity strengthening module and the airflow circulation system are all communicated with the working chamber and are sequentially connected in series along an airflow circulation path, and the control system is in signal connection with the temperature and humidity adjusting system, the low-humidity strengthening module and the airflow circulation system. Through the scientific proportion of the composite molecular sieve and the silica gel, the honeycomb structure design and an intermittent operation mechanism of a regeneration unit, the ultra-low humidity stability control bottleneck is successfully broken through, a temperature priority pre-regulation strategy is adopted, dynamic wind speed optimization is combined, the temperature and humidity uniformity is greatly improved, and a solid guarantee is provided for the reliability of test data.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of test devices, in particular to a programmable low-humidity control constant-temperature and constant-humidity test chamber and a temperature and humidity adjusting method thereof. BACKGROUND

[0002] In the product reliability testing of the fields of electronics, semiconductors, new materials and aerospace, etc., the super-low humidity and high-precision constant-temperature and constant-humidity environment is the core test condition, and the constant-temperature and constant-humidity test chamber becomes the key supporting equipment. However, the existing technology has significant bottlenecks: the low-humidity control capability is limited to above 10% RH, the imbalance of the proportioning of the composite adsorption material and the lack of regeneration mechanism result in serious humidity drift in the low-humidity section; the temperature and humidity adjustment has coupling interference, the temperature precision is only ±0.5℃, the humidity uniformity is more than ±3% RH, and the precise testing requirements cannot be met; the multi-section temperature and humidity curve needs to be manually switched, the data storage capacity is insufficient and inconvenient to export; the design defects of the sealing and heat preservation result in high energy consumption, and there is lack of adsorption efficiency monitoring and other fault early warning mechanisms, which easily causes test interruption. Meanwhile, the replacement of the adsorption assembly is complicated, and the air flow distribution is uneven, which further restricts the practicability of the equipment. SUMMARY

[0003] In order to overcome the deficiencies of the prior art, the present application provides a programmable low-humidity control constant-temperature and constant-humidity test chamber and a temperature and humidity adjusting method thereof, which can effectively solve the problems raised in the background art.

[0004] The technical scheme adopted by the present application to solve its technical problems is as follows: A programmable low-humidity control constant-temperature and constant-humidity test chamber, comprising a chamber body, a working chamber, a temperature and humidity adjusting system, a low-humidity strengthening module, a control system and an air flow circulation system, the working chamber is sealingly arranged in the middle of the inner cavity of the chamber body, the temperature and humidity adjusting system, the low-humidity strengthening module and the air flow circulation system are all in communication with the working chamber, and the three are sequentially connected along the air flow circulation path, and the control system is signal-connected with the temperature and humidity adjusting system, the low-humidity strengthening module and the air flow circulation system respectively; The control system is internally provided with a programmable control unit for storing and executing a multi-section temperature and humidity linkage control program; The low-humidity strengthening module is detachably installed on the inner side wall of the air inlet channel of the working chamber, the low-humidity strengthening module comprises an adsorption assembly, a regeneration unit and a temperature compensation piece, the adsorption assembly adopts a composite molecular sieve material, the regeneration unit is arranged in close contact with the adsorption assembly, and the temperature compensation piece surrounds the outer periphery of the adsorption assembly; The temperature and humidity adjusting system comprises a heating assembly, a refrigeration assembly and a humidifying assembly, the heating assembly and the refrigeration assembly are connected in series in the air inlet channel, the humidifying assembly is arranged between the heating assembly and the low-humidity strengthening module, and the atomizing outlet of the humidifying assembly faces the air flow direction; The air circulation system comprises a circulating fan, a wind deflector and a flow equalizing net, the circulating fan is arranged at the top of the air outlet channel, the wind deflector is arranged at the top of the working chamber in an inclined manner, and the flow equalizing net covers the air inlet end and the air outlet end of the working chamber.

[0005] A temperature and humidity adjusting method of a programmable low-humidity control constant temperature and humidity test chamber, comprising the following steps: Step S1: input a target temperature and humidity curve through a programmable control unit of a control system, the target temperature and humidity curve comprises at least three continuous temperature and humidity parameter groups, each parameter group comprises a target temperature value, a target humidity value (which can be as low as 1%RH-5%RH) and a duration; Step S2: start an air circulation system, collect current temperature and humidity data in real time through a temperature and humidity sensor inside the working chamber, and feed back to the control system; Step S3: according to the deviation of the current temperature and humidity data and the target parameter group, first drive the temperature and humidity adjusting system to perform temperature pre-adjustment, so that the temperature of the working chamber reaches the target temperature within ±0.1℃; Step S4: after the temperature is stabilized, the control system synchronously starts a low-humidity intensification module and a humidifying assembly, and adopts a cooperative strategy of "dehumidification priority-humidification fine adjustment": when the current humidity is higher than the target humidity, the adsorption assembly starts deep dehumidification, and the regeneration unit intermittently operates to maintain the adsorption efficiency; when the current humidity is lower than the target humidity, the humidifying assembly performs micron-level atomization humidification, and a temperature compensation member starts to offset the temperature fluctuation caused by humidification; Step S5: after each parameter group is operated, the control system automatically switches to the next parameter group, and repeats steps S2-S4 until the whole preset program is completed; during the operation, the control system dynamically adjusts the circulating air speed through an air speed adjusting module of the air circulation system, so that the uniformity of the temperature and humidity inside the working chamber is ≤±0.5℃ and ≤±1%RH.

[0006] As a further description of the above technical solution, the composite molecular sieve material is mixed and pressed by A-type molecular sieve and silica gel at a mass ratio of 3:1, the porosity of the adsorption assembly is 45%-60%, and the surface is provided with honeycomb-shaped ventilation channels with a diameter of 0.8-1.2mm.

[0007] As a further description of the above technical solution, the regeneration unit is an electric heating sheet or a microwave generator, the starting interval of the regeneration unit is 30-60min, the single regeneration time is 5-10min, and the output power of the temperature compensation member during the regeneration process is 15%-25% of the rated power of the heating assembly.

[0008] As a further description of the above technical solution, the heating component is a finned electric heater, which is located at the inlet of the air inlet channel, and the cooling component is a compression cooling system, whose evaporator is connected in series downstream of the heating component, and the surface of the evaporator is provided with an anti-frost coating. The humidification component is an ultrasonic atomizer with an atomization particle size of 5-10μm, and the humidification component is equipped with a flow regulating valve, the valve opening of which is dynamically controlled by the control system according to the humidity deviation.

[0009] As a further description of the above technical solution, the control system also includes a human-machine interface and a data storage module. The human-machine interface supports the visual editing, previewing and modification of the target temperature and humidity curve. The data storage module can store at least 100 sets of historical running programs and corresponding temperature and humidity change data, and supports USB export.

[0010] As a further description of the above technical solution, the inner wall of the chamber is made of 304 stainless steel, and the surface of the inner wall is electrolytically polished. The space between the chamber and the inner wall of the box is filled with a thermal insulation layer, which is a polyurethane foam material with a thickness of 50-80mm.

[0011] As a further description of the above technical solution, the flow equalization mesh is a double-layer stainless steel wire mesh structure, with the mesh counts of the two layers being 80 mesh and 120 mesh respectively, and the spacing between the two layers being 10-15mm; the inclination angle of the air guide plate is 30°-45°, and the surface of the air guide plate is provided with an arc-shaped air guide groove.

[0012] As a further description of the above technical solution, the low humidity enhancement module is connected to the inner wall of the air inlet channel by a snap-fit ​​connection, and the adsorption component can be disassembled and replaced separately; the inner walls of both the air inlet channel and the air outlet channel are provided with sealing strips, and the sealing strips are made of fluororubber.

[0013] As a further description of the above technical solution, the control system also has a built-in fault diagnosis module. When the temperature and humidity deviation exceeds the preset threshold (temperature ±1℃, humidity ±3%RH) for 10 minutes, or when the adsorption efficiency of the low humidity enhancement module drops to 60% of the initial value, the fault diagnosis module issues an alarm signal and records the fault type and occurrence time.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The present invention provides a programmable low-humidity controlled constant temperature and humidity test chamber and its temperature and humidity adjustment method, which has at least one of the following beneficial effects during use: Firstly, its low-humidity control capability breaks through industry bottlenecks. The adsorption components, combining composite molecular sieves and silica gel in a 3:1 ratio with a honeycomb structure and an intermittent regeneration mechanism, achieve stable ultra-low humidity control of 1%-5%RH. Temperature pre-adjustment accuracy of ±0.1℃, coupled with dynamic wind speed regulation, ensures temperature and humidity uniformity of ≤±0.5℃ and ≤±1%RH respectively, guaranteeing reliable precision test data. Secondly, intelligent operation and maintenance efficiency is significantly improved. The programmable control unit supports automatic switching of multi-segment curves, a visual interface, and data storage and export functions for 100 sets of data, enabling unattended operation and test traceability. The snap-on low-humidity module design facilitates easy replacement of the adsorption components, shortening downtime. Thirdly, it balances operational stability and economy. Fluororubber sealing and polyurethane insulation design block internal and external interference, an anti-frost coating on the evaporator reduces losses, and the regeneration unit and temperature compensation components operate on demand to reduce energy consumption. Fourthly, a comprehensive fault warning mechanism monitors temperature and humidity deviations and adsorption efficiency in real time, alarming and recording abnormalities to prevent test interruptions. Fifth, it is highly versatile and adaptable to the low-humidity testing needs of various industries such as electronics and aerospace, thereby improving equipment utilization. Attached Figure Description

[0015] Fig. 1 This is a schematic diagram of the overall structure of a programmable low-humidity controlled constant temperature and humidity test chamber according to the present invention. Fig. 2 This is a flowchart illustrating the steps of a programmable low-humidity control constant temperature and humidity test chamber according to the present invention.

[0016] Numbering on the map: 1. Enclosure; 2. Chamber; 3. Temperature and humidity control system; 4. Low humidity enhancement module; 5. Airflow circulation system; 6. Control system. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figs. 1-2 As shown, the present invention provides a programmable low-humidity controlled constant temperature and humidity test chamber, including a chamber body 1, a working chamber 2, a temperature and humidity control system 3, a low-humidity enhancement module 4, a control system 6, and an airflow circulation system 5. The working chamber 2 is sealed in the middle of the inner cavity of the chamber body 1. The temperature and humidity control system 3, the low-humidity enhancement module 4, and the airflow circulation system 5 are all connected to the working chamber 2, and the three are connected in series along the airflow circulation path. The control system 6 is connected to the temperature and humidity control system 3, the low-humidity enhancement module 4, and the airflow circulation system 5 respectively. The enclosure 1 adopts a three-layer design of "outer protection + middle insulation + inner working chamber 2": the inner wall of the working chamber 2 is made of 304 stainless steel electropolished (to reduce moisture adsorption and corrosion), and a 50-80mm polyurethane foam insulation layer is filled between it and the inner wall of the enclosure 1 (low thermal conductivity, blocking heat exchange between the inside and outside). Fluororubber sealing strips are installed on the inner wall of the air inlet / outlet channel (resistant to high and low temperatures, strong sealing performance, to prevent humidity leakage).

[0019] The control system 6 has a built-in programmable control unit for storing and executing multi-segment temperature and humidity linkage control programs; It features a built-in programmable control unit (supporting multi-segment program storage and execution), a human-machine interface (visual editing / preview / modification of temperature and humidity curves), a data storage module (100 sets of historical programs + temperature and humidity data, USB export), and a fault diagnosis module (real-time monitoring of operating conditions).

[0020] The user inputs the target temperature and humidity curve (at least 3 continuous parameter groups, including temperature, 1%-5%RH humidity, and duration) → the control system 6 analyzes the program → the linkage of each execution module runs according to the preset sequence → real-time acquisition of sensor data (temperature, humidity, wind speed, adsorption component efficiency, etc.) → dynamic adjustment of output parameters → automatic switching of program segments → data storage upon completion, requiring no manual intervention throughout the process.

[0021] The low humidity enhancement module 4 is detachably installed on the inner side wall of the air inlet channel of the working chamber 2. The low humidity enhancement module 4 includes an adsorption component, a regeneration unit and a temperature compensation component. The adsorption component is made of composite molecular sieve material. The regeneration unit is attached to the adsorption component. The temperature compensation component surrounds the outer periphery of the adsorption component. The temperature and humidity control system 3 includes a heating component, a cooling component and a humidifying component. The heating component and the cooling component are connected in series in the air inlet channel. The humidifying component is disposed between the heating component and the low humidity enhancement module 4, and the atomization outlet of the humidifying component faces the airflow direction. Heating Components: Finned electric heater (air inlet), output power is adjusted by the 6PWM control system to quickly heat to the target range. The finned design increases the heat exchange area and improves heating uniformity. Cooling Components: Compression-type refrigeration system, with the evaporator connected in series downstream of the heating components. The surface is coated with an anti-frost coating (to prevent low-temperature frost from affecting heat exchange efficiency and humidity control). The cooling rate is precisely controlled by starting and stopping the compressor or adjusting the expansion valve opening. Regulation Logic: The 6PWM control system compares the current temperature with the target value and prioritizes activating the corresponding components (heating for heating, cooling for cooling). PID closed-loop control achieves precise stability within ±0.1℃, eliminating temperature interference for humidity regulation.

[0022] The airflow circulation system 5 includes a circulating fan, an air guide plate, and a flow equalization net. The circulating fan is located at the top of the air outlet channel, the air guide plate is arranged obliquely at the top of the working chamber 2, and the flow equalization net covers the air inlet and air outlet of the working chamber 2.

[0023] Airflow circulation path: Circulating fan (top of the air outlet duct) drives air → air outlet equalization mesh (120 mesh + 80 mesh double-layer stainless steel mesh, spacing 10-15mm, for initial airflow equalization) → air guide plate (30°-45° inclined, with arc-shaped air guide grooves on the surface to guide airflow evenly to chamber 2) → chamber 2 → air inlet equalization mesh (secondary airflow equalization) → air inlet duct → heating component → cooling component → humidification component → low humidity enhancement module 4 → back to chamber 2, forming a closed-loop circulation circuit to ensure no dead zones in the internal airflow. The air inlet duct inner wall is connected by a snap-fit ​​mechanism, and the adsorption component can be disassembled and replaced individually, reducing maintenance costs.

[0024] Airflow circulation system 5: The circulating fan is equipped with a wind speed adjustment module, and the control system 6 dynamically adjusts the wind speed according to the temperature and humidity uniformity data (real-time acquisition of multi-point sensor data in the chamber 2); the arc-shaped air guide groove of the air guide plate guides the airflow to diffuse evenly along the top of the chamber 2, and the double-layer flow equalization net further refines the airflow, ultimately achieving a temperature and humidity uniformity of ≤±0.5℃ and ≤±1%RH.

[0025] Adsorption Components: Type A molecular sieves and silica gel are mixed and pressed at a 3:1 mass ratio, with a porosity of 45%-60% and honeycomb-shaped ventilation channels (0.8-1.2mm in diameter) on the surface. The molecular sieves are responsible for deep adsorption of moisture (preferably small water molecules), while the silica gel assists in adsorption and increases the adsorption capacity. The honeycomb structure increases the contact area and ventilation volume, ensuring dehumidification efficiency. Regeneration Unit: Electric heating element / microwave generator (attached to the adsorption components), with a start-up interval of 30-60 minutes and a single regeneration cycle of 5-10 minutes. Before the adsorption components become saturated, the regeneration unit starts heating / microwave heating to desorb and discharge the adsorbed moisture, maintaining adsorption efficiency. During regeneration, the temperature compensation element (surrounding the adsorption components) is activated, with an output power of 15%-25% of the rated power of the heating components, to offset the impact of regeneration heat on the temperature of the circulating airflow and avoid temperature fluctuations.

[0026] Humidification component: Ultrasonic atomizer (between heating component and low humidity enhancement module 4), atomization particle size 5-10μm (micron-level droplets evaporate quickly, avoiding water droplet condensation), equipped with flow regulating valve - when the humidity is lower than the target value, the control system 6 dynamically adjusts the valve opening according to the humidity deviation to accurately control the humidification amount; at the same time, the temperature compensation component is activated to counteract the cooling effect brought by atomization evaporation and ensure temperature stability.

[0027] A method for regulating temperature and humidity in a programmable low-humidity control constant temperature and humidity test chamber includes the following steps: Step S1: Input the target temperature and humidity curve through the programmable control unit of the control system 6. The target temperature and humidity curve includes at least 3 consecutive temperature and humidity parameter groups. Each parameter group includes the target temperature value, the target humidity value (which can be as low as 1%RH-5%RH), and the duration. Step S2: Start the airflow circulation system 5, collect the current temperature and humidity data in real time through the temperature and humidity sensor inside the working chamber 2, and feed it back to the control system 6; Step S3: Based on the deviation between the current temperature and humidity data and the target parameter set, the control system 6 first drives the temperature and humidity regulation system 3 to perform temperature pre-adjustment so that the temperature of the working chamber 2 reaches the target temperature within ±0.1℃. Step S4: After the temperature stabilizes, the control system 6 synchronously starts the low humidity enhancement module 4 and the humidification component, adopting a coordinated strategy of "dehumidification priority - humidification fine-tuning": when the current humidity is higher than the target humidity, the adsorption component starts deep dehumidification, and the regeneration unit operates intermittently to maintain adsorption efficiency; when the current humidity is lower than the target humidity, the humidification component performs micron-level atomization humidification, and at the same time the temperature compensation component is activated to offset the temperature fluctuation caused by humidification. Step S5: After each parameter group is completed, the control system 6 automatically switches to the next parameter group and repeats steps S2-S4 until all preset programs are completed. During operation, the control system 6 dynamically adjusts the circulating wind speed through the wind speed adjustment module of the airflow circulation system 5 to ensure that the temperature and humidity uniformity inside the chamber 2 is ≤±0.5℃ and ≤±1%RH.

[0028] Monitoring parameters: temperature and humidity deviation (preset thresholds: temperature ±1℃, humidity ±3%RH), low humidity enhancement module 4 adsorption efficiency (60% of the initial value is the critical value), fan speed, heating / cooling component operating current, etc.

[0029] Furthermore, the composite molecular sieve material is formed by mixing and pressing type A molecular sieve and silica gel at a mass ratio of 3:1. The porosity of the adsorption component is 45%-60%, and its surface is provided with honeycomb-shaped ventilation channels with a channel diameter of 0.8-1.2 mm.

[0030] The composite molecular sieve material ratio (3:1A type molecular sieve + silica gel) and structural design (honeycomb channels, 45%-60% porosity), combined with the intermittent operation strategy of the regeneration unit, achieve stable control in the ultra-low humidity range of 1%-5%RH, solving the problems of insufficient dehumidification capacity and easy drift in the low humidity section of conventional equipment.

[0031] Furthermore, the regeneration unit is an electric heating element or a microwave generator. The start-up interval of the regeneration unit is 30-60 minutes, the single regeneration time is 5-10 minutes, and the output power of the temperature compensation element during the regeneration process is 15%-25% of the rated power of the heating component.

[0032] Temperature pre-conditioning (±0.1℃ accuracy) + humidity coordinated fine-tuning (humidification / dehumidification + temperature compensation) + dynamic wind speed adjustment, triple protection ensures that the accuracy and uniformity of temperature and humidity control far exceed industry standards, ensuring the consistency of the test environment and improving the reliability and repeatability of test data.

[0033] Furthermore, the heating component is a finned electric heater, located at the air inlet; the cooling component is a compression refrigeration system, with its evaporator connected in series downstream of the heating component, and the evaporator surface is provided with an anti-frost coating; the humidification component is an ultrasonic atomizer with an atomization particle size of 5-10μm, and the humidification component is equipped with a flow regulating valve, the valve opening being dynamically controlled by the control system 6 according to the humidity deviation.

[0034] The multi-segment program editing and automatic switching function supports the operation of ≥3 continuous temperature and humidity parameter groups, which can simulate the aging and stability testing of products under different environments (such as the cyclic testing of electronic components from normal temperature and humidity → high temperature and low humidity → low temperature and low humidity), without the need for manual switching, thus improving the efficiency of the test.

[0035] Furthermore, the control system 6 also includes a human-machine interface and a data storage module. The human-machine interface supports the visual editing, previewing, and modification of the target temperature and humidity curve. The data storage module can store at least 100 sets of historical running programs and corresponding temperature and humidity change data, and supports USB export.

[0036] The human-computer interaction interface provides visual operation (curve editing / preview), data storage and USB export (100 sets of historical data), facilitating experimental process traceability, data statistical analysis and report generation; the snap-on low humidity enhancement module 4 and the individually replaceable adsorption components simplify the maintenance process and shorten downtime.

[0037] The evaporator's anti-frost coating prevents low-temperature frost from clogging the channels; the fluororubber sealing strip resists high and low temperature aging and chemical corrosion; the 304 stainless steel electropolished inner wall reduces moisture residue and contamination; and the flow distribution mesh and air guide plate optimize airflow distribution and reduce component wear, ensuring the equipment's long-term stable operation in all aspects.

[0038] Furthermore, the inner wall of the chamber 2 is made of 304 stainless steel, and the surface of the inner wall is electrolytically polished. The space between the chamber 2 and the inner wall of the box 1 is filled with a thermal insulation layer, which is made of polyurethane foam material with a thickness of 50-80mm.

[0039] Furthermore, the flow equalization mesh is a double-layer stainless steel wire mesh structure, with the two layers having mesh counts of 80 mesh and 120 mesh respectively, and the spacing between the two layers being 10-15mm; the inclination angle of the air guide plate is 30°-45°, and the surface of the air guide plate is provided with arc-shaped air guide grooves.

[0040] Furthermore, the low-humidity enhancement module 4 is connected to the inner wall of the air inlet channel via a snap-fit ​​connection, and the adsorption component can be disassembled and replaced separately; both the inner walls of the air inlet channel and the air outlet channel are equipped with sealing strips made of fluororubber.

[0041] The regeneration unit operates intermittently (30-60 minute intervals) instead of continuously, reducing energy consumption; the temperature compensation component is activated on demand (operating only during the humidification / regeneration phase), avoiding energy waste; the insulation layer (50-80mm polyurethane) reduces heat loss and further reduces operating costs.

[0042] Furthermore, the control system 6 also has a built-in fault diagnosis module. When the temperature and humidity deviation exceeds the preset threshold (temperature ±1℃, humidity ±3%RH) for 10 minutes, or when the adsorption efficiency of the low humidity enhancement module 4 drops to 60% of the initial value, the fault diagnosis module issues an alarm signal and records the fault type and the time of occurrence.

[0043] Response logic: When abnormal parameters are detected for 10 minutes or the adsorption efficiency reaches the critical value, the fault diagnosis module immediately issues an audible and visual alarm signal, and records the fault type (such as "humidity deviation exceeds the limit" or "adsorption component failure"), the time of occurrence and the corresponding parameters, so that maintenance personnel can quickly locate the problem and avoid equipment damage or invalidation of test data.

[0044] With a wide temperature and humidity range (especially ultra-low humidity of 1%-5%RH), high-precision control and stable operation, it can be adapted to industries such as electronics, semiconductors, new materials, precision instruments, and aerospace, meeting the needs of various scenarios such as low-humidity storage, aging testing, and environmental adaptability testing. It eliminates the need for customized equipment for specific scenarios, thereby improving equipment utilization.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A programmable low-humidity control constant temperature and humidity test, characterized in that: The application relates to a low-humidity strengthening and temperature-humidity adjusting system, which comprises a box body, a working chamber, a temperature-humidity adjusting system, a low-humidity strengthening module, a control system and an air flow circulation system. The control system is internally provided with a programmable control unit for storing and executing a multi-section temperature-humidity linkage control program. The low-humidity strengthening module is detachably arranged on the inner side wall of the air inlet channel of the working chamber, and comprises an adsorption assembly, a regeneration unit and a temperature compensation element. The temperature-humidity adjusting system comprises a heating assembly, a refrigeration assembly and a humidifying assembly. The air flow circulation system comprises a circulating fan, a wind deflector and a flow equalizing net.

2. The method of claim 1, wherein the programmable low-humidity control constant temperature and humidity test chamber is characterized in that, The following steps are included: Step S1: input a target temperature-humidity curve into the programmable control unit of the control system, wherein the target temperature-humidity curve comprises at least three continuous temperature-humidity parameter groups, and each parameter group comprises a target temperature value, a target humidity value (which can be as low as 1%RH-5%RH) and a duration; Step S2: start the air flow circulation system, collect current temperature-humidity data in the working chamber in real time through a temperature-humidity sensor, and feed back the data to the control system; Step S3: according to the deviation between the current temperature-humidity data and the target parameter group, the control system drives the temperature-humidity adjusting system to perform temperature pre-adjustment, so that the temperature of the working chamber reaches the target temperature within a range of plus or minus 0.1 DEG C; Step S4: after the temperature is stabilized, the control system simultaneously starts the low-humidity strengthening module and the humidifying assembly, and adopts a cooperative strategy of "prior dehumidification and slight humidification adjustment": when the current humidity is higher than the target humidity, the adsorption assembly starts deep dehumidification, and the regeneration unit intermittently operates to maintain the adsorption efficiency; when the current humidity is lower than the target humidity, the humidifying assembly performs slight atomization humidification, and the temperature compensation element is started to offset the temperature fluctuation caused by the humidification; Step S5: after the operation of each parameter group is completed, the control system automatically switches to the next parameter group, and repeats steps S2-S4 until the whole preset program is completed; during the operation, the control system dynamically adjusts the circulating air speed through the air speed adjusting module of the air flow circulation system, so that the uniformity of the temperature and humidity in the working chamber is less than or equal to plus or minus 0.5 DEG C and less than or equal to plus or minus 1%RH.

3. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The composite molecular sieve material is obtained by mixing and pressing A-type molecular sieve and silica gel at a mass ratio of 3:1, the porosity of the adsorption assembly is 45%-60%, and the surface of the adsorption assembly is provided with honeycomb-shaped air holes with a diameter of 0.8-1.2 mm.

4. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The regeneration unit is an electric heating sheet or a microwave generator, the start interval of the regeneration unit is 30-60 min, the single regeneration time is 5-10 min, and the output power of the temperature compensation element during the regeneration process is 15%-25% of the rated power of the heating assembly.

5. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The heating assembly is a fin type electric heater arranged at the inlet of the air inlet channel, and the refrigeration assembly is a compression type refrigeration system, and the evaporator of the refrigeration assembly is connected downstream of the heating assembly, and the surface of the evaporator is provided with an anti-frosting coating. The humidifying assembly is an ultrasonic atomizer, the atomized particle size is 5-10 μm, and the humidifying assembly is provided with a flow regulating valve, and the valve opening degree is dynamically controlled by the control system according to the humidity deviation.

6. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The control system further comprises a man-machine interface and a data storage module, the man-machine interface supports visual editing, previewing and modifying of the target temperature and humidity curve, the data storage module can store at least 100 groups of historical operation programs and corresponding temperature and humidity change data, and supports USB export.

7. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The inner wall of the working chamber is made of 304 stainless steel, the inner wall surface is subjected to electrolytic polishing treatment, a heat preservation and insulation layer is filled between the working chamber and the inner wall of the box, the heat preservation and insulation layer is polyurethane foaming material, and the thickness is 50-80 mm.

8. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The flow equalizing net is a double-layer stainless steel wire mesh structure, the mesh numbers of the two layers of wire meshes are 80 and 120 respectively, and the spacing between the two layers of wire meshes is 10-15 mm; the inclination angle of the air deflector is 30°-45°, and the surface of the air deflector is provided with an arc-shaped air guide groove.

9. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The low-humidity strengthening module is connected with the inner side wall of the air inlet channel through a buckle type connection, and the adsorption assembly can be individually disassembled and replaced; the inner walls of the air inlet channel and the air outlet channel are provided with sealing rubber strips, and the sealing rubber strips are made of fluorine rubber material.

10. The programmable low-humidity control constant temperature and humidity test chamber according to claim 1, characterized in that: The control system further comprises a fault diagnosis module, when the temperature and humidity deviation exceeds the preset threshold value (temperature ±1℃, humidity ±3%RH) for 10 min, or the adsorption efficiency of the low-humidity strengthening module decreases to 60% of the initial value, the fault diagnosis module sends an alarm signal, and records the fault type and occurrence time.

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