A constant temperature and humidity test chamber

Abstract

This utility model relates to a constant temperature and humidity test chamber in the field of test chambers. It includes a dual heating system formed by a PID heater and an inner wall electric heating tube. The heating power is precisely adjusted by a PID controller, and the rapid response characteristics of the electric heating tube achieve precise temperature control and rapid heating and cooling. Side connecting plates with sliding clamps are installed on both sides of the inner wall of the chamber to accommodate test samples of different sizes and prevent displacement. An ultrasonic atomizing humidifier and atomizing nozzle are set on the top to atomize water into nano-sized particles for uniform diffusion. With the help of a semiconductor cooling chip, rapid humidity adjustment is achieved. A three-dimensional guide plate and a centrifugal fan are set at the air inlet at the rear to form an airflow circulation system. Combined with temperature and humidity sensor feedback, it ensures that the parameters inside the chamber are highly consistent. The filter chamber is equipped with a dehumidifying plate and a dust filter to form a dual-stage purification structure. A second drive motor drives a scraper to reciprocate through a threaded screw to remove dust accumulated on the surface of the dust filter. High-precision temperature and humidity control is achieved through the coordinated operation of multiple components.

Description

Technical Field

[0001] This utility model relates to the field of test chambers, specifically to a constant temperature and humidity test chamber. Background Technology

[0002] Test chambers are generally enclosed devices used to simulate various environmental conditions or conduct specific tests, and are widely used in scientific research, industrial production, quality control, and other fields. Depending on their purpose and testing conditions, common types of test chambers include: environmental simulation test chambers, aging test chambers, special function test chambers, and medical test chambers. Constant temperature and humidity test chambers are key equipment used to simulate specific temperature and humidity environments to test product performance.

[0003] The constant temperature and humidity test chamber consists of a chamber system, a temperature control system, a refrigeration system, a humidity control system, and an air circulation system. After the items are placed inside the chamber system, the temperature is adjusted by the temperature control system and the refrigeration system, while the air circulation system ensures uniform temperature and humidity.

[0004] Traditional test chambers are increasingly showing shortcomings in temperature uniformity, humidity control accuracy, and long-term operational stability, making it difficult to meet the demands of high-precision testing. Existing test chambers generally employ a single-layer structure, whose insulation performance is limited by the thermal conductivity of the materials. This allows external temperature fluctuations to easily conduct to the interior, increasing energy consumption and causing temperature control deviations. Traditional heating methods often rely on a single heat source, making it difficult to balance heating rate and temperature uniformity, and lacking effective condensation protection measures, which can lead to equipment short circuits or moisture absorption of test samples. Regarding humidity control, conventional humidifiers tend to produce large droplets, resulting in excessively high or uneven humidity levels in certain areas, while flawed airflow design further exacerbates the differences in environmental parameters within the chamber. Furthermore, after prolonged use, filtration systems are prone to increased airflow resistance due to dust accumulation, requiring frequent maintenance shutdowns. The low synergistic efficiency between dehumidification and dust removal modules also makes it difficult to continuously maintain the cleanliness and stability of the testing environment. Utility Model Content

[0005] The purpose of this invention is to solve the above-mentioned defects and provide a constant temperature and humidity test chamber. The chamber body uses a dual-stage ultrasonic atomizing humidifier, which solves the technical problems of existing technology where external temperature fluctuations are easily conducted to the interior, resulting in increased energy consumption, temperature control deviation, and excessively high or uneven local humidity.

[0006] The objective of this utility model is achieved through the following means:

[0007] A constant temperature and humidity test chamber includes a chamber shell and a door panel, with the door panel rotatably connected to the front of the chamber shell. The chamber shell is made of double-layer stainless steel with vacuum insulation material filling the middle. The inner wall of the chamber shell has an anti-condensation coating. PID heaters are installed on both sides of the chamber shell. Heating tubes, side connecting plates, and temperature and humidity sensors are respectively installed on both sides of the inner wall of the chamber shell. Clamping plates are slidably installed on the inner side of the side connecting plates. An ultrasonic atomizing humidifier is installed on the upper surface of the chamber shell. Atomizing nozzles and semiconductor refrigeration are respectively installed at the top of the inner cavity of the chamber shell. The filter box has an air inlet at the back of the housing connected to a filter box and a three-dimensional guide plate. The air inlet at the front of the filter box is connected to a centrifugal fan. A second drive motor is installed on the upper surface of the filter box. A dehumidifying plate and a dust filter plate are installed at the front and back of the inner cavity of the filter box, respectively. A guide seat is added below the dehumidifying plate and the dust filter plate. A threaded screw is rotatably connected to the center of the inner cavity of the filter box. The top of the threaded screw is coaxially connected to the second drive motor. A scraper is sleeved on the surface of the threaded screw. The scraper slides and fits against the dust filter plate. The main control circuit board is also installed in the inner cavity of the housing. The material is placed on the side connecting plate and fixed by clamps. The temperature and humidity inside the chamber are adjusted by a PID heater, electric heating tube, ultrasonic atomizing humidifier, atomizing nozzle, and semiconductor cooling chip. The temperature and humidity inside the chamber are detected by a temperature and humidity sensor. A centrifugal fan delivers outside air along the filter box into the three-dimensional guide plate, forcing the airflow to circulate along an S-shaped path to ensure uniform temperature and humidity inside the chamber. The dehumidification plate and dust filter plate remove dust and moisture from the air. The second drive motor is externally powered and fixed to the filter box via a motor mount, driving the threaded screw to rotate. The scraper plate scrapes impurities from the surface of the dust filter plate according to the direction of the threaded screw, causing the impurities to move along the guide seat to the outside of the filter box. The main control circuit board controls the temperature... The system comprises a control module, a humidity control module, an airflow circulation module, a sensing and feedback module, and a central control module. The temperature control module precisely adjusts the heating power using a PID heater and PID algorithm. The humidity control module controls the ultrasonic atomizing humidifier. The airflow circulation module controls the centrifugal fan to deliver air into the three-dimensional baffle plate. The sensing and feedback module monitors the environmental parameters inside the chamber in real time using temperature and humidity sensors, providing data support to the main control circuit board. The central control module integrates control algorithms and collaboratively manages the PID heater, semiconductor cooling chip, ultrasonic atomizing humidifier, centrifugal fan, and other actuators to achieve fully automated environmental control. The structure and usage of the above modules are existing technologies and will not be described in detail here.

[0008] Furthermore, a transparent observation window is installed at the center of the front of the cabinet door, and the PID heater is connected to the heating element.

[0009] The transparent observation window located in the center of the front of the chamber door allows operators to observe the status of the samples inside in real time without opening the chamber door. The PID heater is connected in series with the heating element through a circuit, and the PID controller is based on the temperature data inside the chamber fed back by the temperature and humidity sensor.

[0010] Furthermore, the bottom liquid outlet of the ultrasonic atomizing humidifier is connected to the top liquid inlet of the atomizing nozzle.

[0011] The liquid outlet at the bottom of the ultrasonic atomizing humidifier is directly connected to the liquid inlet at the top of the atomizing nozzle through a sealed pipe. After the humidifier atomizes liquid water by high-frequency vibration, the resulting water mist particles are transported to the atomizing nozzle through the pipe. The vortex structure inside the nozzle further refines the water mist and evenly diffuses it into the chamber space. Combined with the humidity regulation function of the semiconductor cooling chip, the humidity inside the chamber is quickly balanced.

[0012] Furthermore, side passage grooves are provided on both sides of the back of the housing, and the heating element is installed in the inner cavity of the side passage groove.

[0013] The side channels on both sides of the back of the housing provide embedded installation space for the heating element. The heating element is arranged axially along the inner cavity of the side channel, and its heating surface is in direct contact with the airflow path inside the housing. When the PID heater and the heating element work together, the open structure of the side channel promotes the circulation of hot air along the diagonal direction of the housing, reducing temperature dead zones.

[0014] Furthermore, a first drive motor is installed on the outer side of the housing, the first drive motor is coaxially connected to the side connecting plate, and the side connecting plate is rotatably connected to both sides of the inner wall of the housing.

[0015] The first drive motor is connected to an external power source and fixed to the housing via a motor mount. The output shaft of the first drive motor is coaxially connected to the end of the side connecting plate via a rigid coupling. The other end of the side connecting plate is rotatably connected to the inner wall of the housing via a bearing assembly.

[0016] Furthermore, threaded screws are rotatably connected to the inner side of the side connecting plate, and a ring connecting handle is installed at the top of each threaded screw, with a clamping plate sleeved on the surface of the threaded screw.

[0017] The threaded screw, which is rotatably connected to the inner side of the side connecting plate, rotates synchronously through the ring connecting handle. The clamping plate is fitted onto the surface of the threaded screw through the internal threaded hole. When the ring connecting handle is rotated, the threaded screw converts the rotational motion into the linear displacement of the clamping plate, thereby adjusting the lateral position of the clamping plate inside the side connecting plate to accommodate test samples of different sizes.

[0018] The beneficial effects of this utility model are:

[0019] 1. The chamber shell adopts a double-layer stainless steel structure and is filled with vacuum insulation material. Combined with the anti-condensation coating on the inner wall, it can effectively block the influence of external temperature and prevent the generation of internal condensation, thereby maintaining the internal temperature stability of the chamber, reducing energy consumption, and avoiding damage to test samples or equipment components caused by water vapor condensation. The PID heaters on both sides and the electric heating tubes on the inner wall form a dual heating system. The PID controller adjusts the heating power through a precise algorithm. Combined with the fast response characteristics of the electric heating tubes, it can achieve precise temperature control and rapid heating and cooling, ensuring uniform temperature distribution and minimal fluctuation range inside the chamber, meeting the requirements of high-precision temperature and humidity testing.

[0020] 2. The side connecting plates and sliding clamps installed on both sides of the inner wall of the chamber form an adjustable sample fixing structure. The clamps slide on the inside of the side connecting plates to accommodate test samples of different sizes, effectively preventing the samples from shifting or vibrating during the test and ensuring the accuracy of the test data. The ultrasonic atomizing humidifier and atomizing nozzle set at the top can atomize water and diffuse it evenly into the chamber through the nozzle. Combined with the semiconductor cooling chip, it can achieve rapid humidity adjustment and avoid the localized humidity unevenness that is easy to occur in traditional humidification methods.

[0021] 3. The three-dimensional air guide plate at the rear air intake end and the centrifugal fan form a high-efficiency airflow circulation system. The centrifugal fan forces the airflow to circulate along the preset path of the air guide plate. Combined with the real-time feedback data from the temperature and humidity sensor built into the chamber, it can ensure that the temperature and humidity parameters in each area of ​​the chamber are highly consistent. The dehumidification plate and dust filter plate set in the filter box form a two-stage air purification structure. The dehumidification plate adsorbs excess moisture in the intake air, and the dust filter plate intercepts particulate pollutants, effectively avoiding external impurities from interfering with the test environment. The matching second drive motor drives the threaded screw to drive the scraper plate to reciprocate, which can automatically remove the dust accumulated on the surface of the dust filter plate and prevent the filter screen from clogging and causing airflow obstruction. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a constant temperature and humidity test chamber according to the present invention;

[0023] Figure 2 This is a schematic diagram of the right side view of the shell structure of a constant temperature and humidity test chamber according to the present invention;

[0024] Figure 3 This is a schematic diagram of the right rear side section of the shell of a constant temperature and humidity test chamber according to the present invention;

[0025] Figure 4 This is a schematic diagram of an ultrasonic atomizing humidifier and its connection structure for a constant temperature and humidity test chamber according to the present invention.

[0026] Figure 5 This is a schematic diagram of the side connecting plate and its connection structure of a constant temperature and humidity test chamber according to the present invention.

[0027] Figure 6 This is a cross-sectional internal structure diagram of the filter box of a constant temperature and humidity test chamber according to the present invention.

[0028] In the diagram, 1-box shell, 2-box door panel, 3-PID heater, 4-ultrasonic atomizing humidifier, 5-side passage, 6-electric heating tube, 7-first drive motor, 8-side connecting plate, 9-threaded screw, 10-ring connecting handle, 11-clamping plate, 12-temperature and humidity sensor, 13-atomizing nozzle, 14-semiconductor cooling chip, 15-filter box, 16-centrifugal fan, 17-second drive motor, 18-dehumidification plate, 19-dust filter plate, 20-material guide seat, 21-threaded screw, 22-scraper plate, 23-three-dimensional guide plate. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] In this embodiment, refer to Figures 1-6The specific implementation of the constant temperature and humidity test chamber includes a chamber shell 1 and a chamber door 2, with the chamber door 2 rotatably connected to the front of the chamber shell 1. The chamber shell 1 adopts a double-layer stainless steel structure, with vacuum insulation material filled in the middle. The inner wall of the chamber shell 1 is provided with an anti-condensation coating. PID heaters 3 are installed on both sides of the chamber shell 1. Electric heating tubes 6, side connecting plates 8, and temperature and humidity sensors 12 are respectively added to both sides of the inner wall of the chamber shell 1. Clamping plates 11 are slidably added to the inner side of the side connecting plates 8. An ultrasonic atomizing humidifier 4 is installed on the upper surface of the chamber shell 1. Atomizing nozzles 13 and semiconductor cooling chips 14 are respectively added to the top of the inner cavity of the chamber shell 1. The back of the chamber shell 1... The air inlet end is connected to the filter box 15 and the three-dimensional guide plate 23 respectively. The air inlet end of the filter box 15 is connected to the centrifugal fan 16. The upper surface of the filter box 15 is equipped with the second drive motor 17. The front and rear of the inner cavity of the filter box 15 are respectively equipped with the dehumidification plate 18 and the dust filter plate 19. The material guide seat 20 is added below the dehumidification plate 18 and the dust filter plate 19. The center of the inner cavity of the filter box 15 is rotatably connected to the threaded screw 21. The top end of the threaded screw 21 is coaxially connected to the second drive motor 17. The surface of the threaded screw 21 is fitted with the scraper plate 22. The scraper plate 22 and the dust filter plate 19 are slidably attached. The inner cavity of the box shell 1 is also equipped with the main control circuit board. The material is placed on the side connecting plate 8 and fixed by the clamping plate 11. The temperature and humidity inside the housing 1 are adjusted by the PID heater 3, electric heating tube 6, ultrasonic atomizing humidifier 4, atomizing nozzle 13 and semiconductor cooling chip 14. The temperature and humidity inside the housing 1 are detected by the temperature and humidity sensor 12. The centrifugal fan 16 delivers outside air along the filter box 15 into the three-dimensional guide plate 23 and forces the airflow to circulate along an S-shaped path to ensure the uniformity of temperature and humidity inside the box. The dehumidification plate 18 and the dust filter plate 19 can remove dust and moisture from the air. The second drive motor 17 is connected to an external power supply and fixed to the filter box 15 through the motor base to drive the threaded screw 21 to rotate. The scraper plate 22 scrapes the impurities on the surface of the dust filter plate 19 according to the rotation of the threaded screw 21, so that the impurities move along the guide seat 20 to the outside of the filter box 15.

[0031] like Figure 2 , Figure 3 and Figure 4As shown, a transparent observation window is installed at the center of the front of the chamber door panel 2, and the PID heater 3 is connected to the heating element 6. The transparent observation window at the center of the front of the chamber door panel 2 allows the operator to observe the internal sample status in real time without opening the chamber door panel 2. The PID heater 3 is connected in series with the heating element 6 through a circuit. The PID controller can dynamically adjust the output power of the PID heater 3 based on the internal temperature data fed back by the temperature and humidity sensor 12. At the same time, the heating element 6, with its rapid thermal response characteristics, can fine-tune the local temperature. The two work together to achieve precise control of the internal temperature. The bottom liquid outlet of the ultrasonic atomizing humidifier 4 is connected to the top liquid inlet of the atomizing nozzle 13. The bottom liquid outlet of the ultrasonic atomizing humidifier 4 is directly connected to the top liquid inlet of the atomizing nozzle 13 via a sealed pipe. After the humidifier atomizes liquid water through high-frequency vibration, the resulting water mist particles are transported to the atomizing nozzle 13 through the pipe. The vortex structure inside the nozzle further refines the water mist and evenly diffuses it into the chamber space. Combined with the humidity regulation function of the semiconductor cooling chip 14, the humidity inside the chamber is quickly balanced. The direct connection design reduces condensation loss during water mist transmission and improves humidification efficiency. The vortex structure of the atomizing nozzle 13 ensures uniform water mist distribution and avoids localized oversaturation. Side passage grooves 5 are provided on both sides of the back of the chamber shell 1, and the electric heating tube 6 is installed in the inner cavity of the side passage groove 5. The side passages 5 on both sides of the back of the housing 1 provide embedded installation space for the heating tubes 6. The heating tubes 6 are arranged axially along the inner cavity of the side passages 5, and their heating surfaces are in direct contact with the airflow path inside the housing. When the PID heater 3 and the heating tubes 6 work together, the open structure of the side passages 5 promotes the circulation of hot air along the diagonal direction of the housing, reducing temperature dead zones. The embedded design of the side passages 5 optimizes the installation stability of the heating tubes 6 and facilitates maintenance and replacement. The open structure enhances the thermal convection effect and improves the temperature uniformity inside the housing.

[0032] like Figure 5As shown, a first drive motor 7 is installed on the outer side of the housing 1. The first drive motor 7 is coaxially connected to the side connecting plate 8, and the side connecting plate 8 is rotatably connected to both sides of the inner wall of the housing 1. The first drive motor 7 is externally powered and fixed to the housing 1 through a motor mount. The output shaft of the first drive motor 7 is coaxially connected to the end of the side connecting plate 8 through a rigid coupling. The other end of the side connecting plate 8 is rotatably connected to the inner wall of the housing 1 through a bearing assembly. When the main control circuit board receives a test command, the first drive motor 7 drives the side connecting plate 8 to rotate to a specified angle, adjusting the airflow direction or sample exposure direction inside the chamber. The coaxial connection structure ensures the rotation accuracy of the side connecting plate 8, meeting the requirements of multi-angle testing. The dynamic adjustment function expands the applicable scenarios of the test chamber, such as simulating the weather resistance of samples under different wind conditions. Threaded screws 9 are rotatably connected to all four sides of the inner surface of the side connecting plate 8. A ring handle 10 is installed at the top of each threaded screw 9, and a clamping plate 11 is fitted onto the surface of the threaded screw 9. The threaded screw 9, which is rotatably connected to the inner side of the side connecting plate 8, rotates synchronously through the ring connecting handle 10. The clamping plate 11 is sleeved on the surface of the threaded screw 9 through the internal threaded hole. When the ring connecting handle 10 is rotated, the threaded screw 9 converts the rotational motion into the linear displacement of the clamping plate 11, thereby adjusting the lateral position of the clamping plate 11 inside the side connecting plate 8 to accommodate test samples of different sizes. The mechanical transmission structure between the threaded screw 9 and the clamping plate 11 provides a stable clamping force to prevent sample vibration. At the same time, the four-point adjustment design ensures that the sample is subjected to uniform force and avoids the risk of deformation caused by stress concentration on one side.

[0033] The process of a constant temperature and humidity test chamber in this embodiment is as follows: Centrifugal fan 16 draws in external air from the front air inlet of filter box 15. The airflow first intercepts particulate pollutants through dust filter plate 19, and then adsorbs excess moisture through dehumidification plate 18, forming a clean and dry airflow. During long-term operation, second drive motor 17 drives threaded screw 21 to rotate, causing scraper 22 to reciprocate along the surface of dust filter plate 19, automatically removing accumulated dust. The dust is discharged from filter box 15 along guide seat 20. The purified air enters the inner cavity of chamber shell 1 through three-dimensional guide plate 23 via a preset path. Centrifugal fan 16 forces airflow to circulate along the diagonal direction of chamber body. Combined with the direct contact between the heating surface of electric heating tube 6 in side channel 5 and airflow, it promotes uniform distribution of hot air. Temperature and humidity sensor 12 monitors the temperature data inside the chamber in real time. The main control circuit board adjusts the output power of PID heater 3 through PID algorithm. At the same time, electric heating tube 6, with its rapid thermal response characteristics, fine-tunes the local temperature. The two work together to achieve precise temperature control inside the chamber. Precise control; the first drive motor 7 can drive the side connecting plate 8 to rotate to a specified angle, adjusting the airflow direction or sample exposure direction. The ultrasonic atomizing humidifier 4 atomizes liquid water through high-frequency vibration and delivers it to the atomizing nozzle 13 through a sealed pipe. The vortex structure inside the nozzle further refines the water mist and evenly diffuses it into the chamber space. The semiconductor cooling chip 14 starts according to the humidity setting value and quickly reduces the humidity inside the chamber through the condensation effect of the cold end surface to achieve dynamic balance. The rotating ring connecting handle 10 drives the threaded screw 9 to rotate, converting the rotational motion into the linear displacement of the clamping plate 11, adjusting the lateral position of the clamping plate 11 inside the side connecting plate 8 to adapt to samples of different sizes. During the test, the transparent observation window allows real-time observation of the sample status, avoiding environmental fluctuations caused by frequent opening of the chamber. The main control circuit board continuously receives feedback data from the temperature and humidity sensor 12 and dynamically adjusts the working status of the PID heater 3, electric heating tube 6, ultrasonic atomizing humidifier 4 and semiconductor cooling chip 14 to ensure that the environmental parameters inside the chamber remain stable within the set range for a long time.

[0034] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A constant temperature and humidity test chamber, comprising a chamber housing and a chamber door plate, and the chamber door plate is rotationally connected to the front face of the chamber housing, characterized in that: The housing is constructed of double-layer stainless steel with vacuum insulation material filling the middle. The inner wall of the housing has an anti-condensation coating. PID heaters are installed on both sides of the housing. Heating tubes, side connecting plates, and temperature and humidity sensors are respectively installed on both sides of the inner wall of the housing. Clamping plates are slidably installed on the inner side of the side connecting plates. An ultrasonic atomizing humidifier is installed on the upper surface of the housing. Atomizing nozzles and semiconductor cooling chips are respectively installed on the top of the inner cavity of the housing. A filter box and a three-dimensional air guide plate are connected to the rear air inlet of the housing. A centrifugal fan is connected to the front air inlet of the filter box. A second drive motor is installed on the upper surface of the filter box. Dehumidifying plates and dust filter plates are installed at the front and rear of the inner cavity of the filter box, respectively. A material guide seat is installed below the dehumidifying plates and dust filter plates. A threaded screw is rotatably connected to the center of the inner cavity of the filter box. The top of the threaded screw is coaxially connected to the second drive motor. A scraper plate is sleeved on the surface of the threaded screw, and the scraper plate and dust filter plate slide in contact. A main control circuit board is also installed in the inner cavity of the housing.

2. The constant temperature and humidity test chamber according to claim 1, characterized in that: A transparent observation window is installed at the center of the front of the box door panel, and the PID heater is connected to the electric heating tube.

3. The constant temperature and humidity test chamber according to claim 1, wherein: The bottom liquid outlet of the ultrasonic atomizing humidifier is connected to the top liquid inlet of the atomizing nozzle.

4. The constant temperature and humidity test chamber according to claim 1, wherein: The back of the housing is provided with side passage grooves on both sides, and the heating element is installed in the inner cavity of the side passage groove.

5. The constant temperature and humidity test chamber according to claim 1, wherein: A first drive motor is installed on the outside of the housing. The first drive motor is coaxially connected to the side connecting plate, and the side connecting plate is rotatably connected to both sides of the inner wall of the housing.

6. The constant temperature and humidity test chamber according to claim 1, wherein: The inner side of the side connecting plate is rotatably connected to threaded screws on all four sides, and the top of each threaded screw is equipped with a ring connecting handle, with a clamping plate sleeved on the surface of the threaded screw.

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