Temperature, humidity and pressure calibration device

Abstract

The utility model discloses a temperature, humidity and pressure calibration device which comprises a test chamber, a control module, a temperature module, a humidity module and a pressure module. The control module is arranged on the outer side of the test chamber; the temperature module comprises a refrigeration structure and a heating structure, and the refrigeration structure and the heating structure are connected with the test chamber and electrically connected with the control module; the humidity module comprises a dry gas input structure and a saturated moisture input structure, and the dry gas input structure and the saturated moisture input structure are respectively connected with the test chamber and are respectively and electrically connected with the control module; the pressure module comprises a pressure sealing cabin, a positive pressure source and a negative pressure source, the pressure sealing cabin is arranged in the test chamber, and the positive pressure source and the negative pressure source are respectively connected with the pressure sealing cabin and are respectively and electrically connected with the control module. According to the utility model, integrated calibration of temperature, humidity and pressure can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of calibration instrument, especially a temperature and humidity pressure calibration device. BACKGROUND

[0002] At present, the instrument for temperature and humidity pressure calibration usually adopts multiple equipment combination to realize, first through the temperature and humidity calibration box realizes the temperature and humidity of the temperature and humidity pressure gauge of being detected to calibrate, then uses the pressure automatic controller to the pressure calibration of the temperature and humidity pressure gauge of being detected. Through the combination use mode of two kinds of instruments or even multiple instruments realizes the calibration of temperature and humidity pressure gauge, undoubtedly increases the work of tester, and, is not favorable to the tester carrying, handling the equipment for calibration. SUMMARY

[0003] The utility model discloses at least solve one of the technical problems in the prior art. For this purpose, the utility model provides a temperature and humidity pressure calibration device.

[0004] The utility model solves the technical problem of the solution scheme:

[0005] A temperature and humidity pressure calibration device, comprising:

[0006] A test chamber;

[0007] A control module is provided outside the test chamber;

[0008] A temperature module includes a refrigeration structure and a heating structure, the refrigeration structure and the heating structure are connected with the test chamber respectively, and are electrically connected with the control module respectively, the refrigeration structure is used to reduce the temperature of the test chamber, and the heating structure is used to heat the temperature of the test chamber;

[0009] A humidity module includes a dry gas input structure and a saturated wet gas input structure, the dry gas input structure and the saturated wet gas input structure are connected with the test chamber respectively, and are electrically connected with the control module respectively, the dry gas input structure is used to input dry gas to the test chamber, and the saturated wet gas input structure is used to input saturated wet gas to the test chamber;

[0010] A pressure module includes a pressure sealed cabin, a positive pressure source and a negative pressure source, the pressure sealed cabin is arranged in the test chamber, the positive pressure source and the negative pressure source are connected with the pressure sealed cabin respectively, and are electrically connected with the control module respectively, the positive pressure source is used to pressurize the pressure sealed cabin, and the negative pressure source is used to extract the pressure of the pressure sealed cabin.

[0011] The utility model discloses at least has the following beneficial effects: the measured member is placed to the pressure sealed cabin, because the pressure sealed cabin is located in the test room, temperature module can carry out temperature control to the test room inside, humidity module can carry out humidity control to the test room inside, pressure module can carry out pressure control to the pressure sealed cabin, and the measured member can complete temperature, humidity and pressure calibration in the test room of this temperature and humidity pressure calibration device. Adopt the design of integration, can conveniently test the person carries, transports, and can reduce the occupation space of calibration equipment.

[0012] As a further improvement of the above technical solution, the temperature and humidity pressure calibration device further comprises a partition and a fan, the partition is arranged in the test chamber and the inner wall of the test chamber together forms a circulating air duct, the fan is arranged in the circulating air duct, and the fan is used to drive air to flow along the circulating air duct.

[0013] As a further improvement of the above technical solution, the temperature module further comprises a temperature measuring element, the temperature measuring element is arranged in the circulating air duct, the temperature measuring element is electrically connected with the control module, and the control module is configured to control the refrigeration structure or the heating structure to work according to the temperature value obtained by the temperature measuring element.

[0014] As a further improvement of the above technical solution, the refrigeration structure comprises a refrigeration machine and a cold conductor, the refrigeration machine is arranged outside the test chamber and is electrically connected with the control module, the cold conductor is used to conduct the cold quantity of the refrigeration machine, the cold conductor is arranged in the circulating air duct, and the fan is arranged on the cold conductor.

[0015] As a further improvement of the above technical solution, the temperature measuring element is arranged on one side of the partition, and the cold conductor is arranged on the other side of the partition.

[0016] As a further improvement of the above technical solution, the humidity module further comprises a humidity sensor, the humidity sensor is used to obtain the humidity value in the test chamber, the humidity sensor is electrically connected with the control module, and the control module is configured to control the dry gas input structure or the saturated wet gas input structure to work according to the humidity value obtained by the humidity sensor.

[0017] As a further improvement of the above technical solution, the dry gas input structure comprises a molecular sieve and a first flow pump, the first flow pump is electrically connected with the control module, the outlet end of the first flow pump is connected with the inlet end of the molecular sieve, and the outlet end of the molecular sieve is communicated with the inside of the test chamber; the saturated wet gas input structure comprises a saturator and a second flow pump, the second flow pump is electrically connected with the control module, the outlet end of the second flow pump is connected with the inlet end of the saturator, and the outlet end of the saturator is communicated with the inside of the test chamber.

[0018] As a further improvement to the above technical solution, the pressure module also includes a pressure sensor, which is used to acquire the pressure value of the pressure sealing chamber. The pressure sensor is electrically connected to the control module, and the control module is configured to control the positive pressure source or the negative pressure source to work according to the pressure value acquired by the pressure sensor.

[0019] As a further improvement to the above technical solution, the positive pressure source includes a third flow pump and a gas storage tank. The third flow pump is electrically connected to the control module, the outlet end of the third flow pump is connected to the inlet end of the gas storage tank, and the outlet end of the gas storage tank is connected to the pressure sealing chamber. The negative pressure source includes a vacuum pump, the inlet end of which is connected to the pressure sealing chamber and electrically connected to the control module.

[0020] As a further improvement to the above technical solution, the positive pressure source further includes a first solenoid valve, which is connected between the gas storage tank and the pressure sealing chamber; the negative pressure source further includes a second solenoid valve, which is connected between the vacuum pump and the pressure sealing chamber; the first solenoid valve and the second solenoid valve are electrically connected to the control module respectively. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of an existing temperature and humidity calibration chamber;

[0023] Figure 2 This is a schematic diagram of the temperature, humidity and pressure calibration device according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the temperature module of the temperature, humidity and pressure calibration device according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the humidity module of the temperature, humidity and pressure calibration device according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the pressure module of the temperature, humidity and pressure calibration device according to an embodiment of this utility model.

[0027] Reference numerals: 100, Test chamber; 110, First evaporator; 120, First heating element; 130, Water pan; 131, Second evaporator; 132, Second heating element; 200, Test chamber; 300, Control module; 400, Temperature module; 410, Refrigeration unit; 420, Cooler; 430, Heating plate; 440, Temperature-controlled platinum resistance thermometer; 500, Humidity module; 510, Molecular sieve; 520, First flow pump; 530, Saturator; 540, Second flow pump; 550, Humidity sensor; 600, Pressure module; 610, Pressure-sealed chamber; 620, Third flow pump; 630, Gas storage tank; 640, First solenoid valve; 650, Vacuum pump; 660, Second solenoid valve; 670, Pressure sensor; 700, Partition; 800, Fan. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. The various technical features of this utility model can be combined interactively without contradicting each other.

[0033] Currently, conventional temperature and humidity calibration chambers on the market use the same temperature control method as environmental test chambers. An automatic pressure controller is then used to calibrate the pressure of the tested temperature and humidity gauges. Specifically, the temperature and humidity calibration chamber uses a first evaporator 110 for cooling and a first heating element 120 for heating within the test chamber 100. Temperature control within the test chamber 100 is achieved by controlling the cooling and heating processes. The first evaporator 110 is the cold source, and the first heating element 120 is the heat source. Stable temperature control is achieved through the balance of heat and cold from the cold and heat sources. Cooling is achieved using a compressor, and heating is achieved using the first heating element 120. (Refrigeration is described in the original text.) Figure 1 .

[0034] Because the cooling capacity of the compressor in test chamber 100 is not precisely controlled, it automatically adjusts to changes in ambient temperature and load. The temperature during this automatic adjustment process varies, resulting in a non-constant cold source temperature. This creates a temperature field within test chamber 100 where the cooling and heating amounts are not fixed. Since air has a low heat capacity, low thermal conductivity, and poor heat transfer ability, it is difficult to achieve high uniformity by adjusting the airflow if the cooling and heating amounts within test chamber 100 are not constant.

[0035] In addition, the humidity control of the existing temperature and humidity calibration chamber is achieved by controlling the water pan 130 inside the test chamber 100. A second evaporator 131 is installed in the water pan 130. The second evaporator 131 cools and frosts to reduce the humidity of the test chamber 100. A second heating tube 132 is also installed in the water pan 130. Humidity is increased by controlling the second heating tube 132 immersed in water to heat it, causing a large amount of water in the water pan 130 to evaporate, thereby increasing the humidity.

[0036] Understandably, the second evaporator 131 is used to refrigerate and frost to absorb a large amount of moisture and remove humidity from the air in the test chamber 100. As the ice layer on the second evaporator 131 and in the water pan 130 becomes thicker, it becomes increasingly difficult to lower the surface temperature of the ice layer. At the same time, the ice layer is also dynamically releasing water molecules. As a result, it is difficult to control the humidity below 30% relative humidity (RH), especially in summer when the ambient humidity is relatively high. When the temperature field of the test chamber 100 is about 20°C, the humidity can hardly be lowered further, and it is impossible to provide test conditions below 30% RH.

[0037] Based on the relationship between humidity and temperature, for every 1°C decrease in temperature, humidity must increase by more than 5%RH (high humidity conditions above 90%RH). Since the temperature of the first evaporator 110 (cold source) inside the test chamber 100 is usually more than 3°C lower than the actual control temperature of the test chamber 100, when controlling high humidity (above 90%RH), a large amount of moisture will condense into water on the first evaporator 110, resulting in a large amount of liquid water in the test chamber 100, which adversely affects humidity calibration.

[0038] During humidity control, the temperature of the second evaporator 131 in the water pan 130 decreases during dehumidification, causing the water pan 130 to become a cold source. Conversely, during humidification, the water pan 130 heats and evaporates, thus becoming a heat source. Even when the temperature within the test chamber 100 is already at equilibrium, humidity control causes temperature instability and disrupts the uniformity of the temperature field, requiring a period of re-equilibrium after each humidity change. Therefore, traditional humidity control equipment has a relatively long control time, especially when operating at high or low humidity levels near the control limits.

[0039] Traditional temperature and humidity calibration chambers struggle to achieve high temperature uniformity by adjusting the airflow. After completing high humidity (above 90% RH) tests, a significant amount of liquid water often remains inside the chamber. When cooling is achieved via the water supply pan (130), the airflow accelerates the evaporation of this liquid water, making it difficult to control humidity at low levels after the high humidity test. This significantly prolongs the humidity control time, impacting the efficiency of subsequent calibration.

[0040] In response, this utility model proposes a temperature, humidity and pressure calibration device that can achieve integrated calibration of temperature, humidity and pressure without the need for multiple devices. It can also solve the problem of mutual influence between temperature and humidity inside the test chamber 200, improve the efficiency of temperature and humidity control, and improve the accuracy of detection.

[0041] In this embodiment, refer to Figure 2 , Figure 3 , Figure 4 and Figure 5 The temperature, humidity, and pressure calibration device includes a test chamber 200, a control module 300, a temperature module 400, a humidity module 500, and a pressure module 600. The test chamber 200 has an inner cavity, and the control module 300 is located on the outside of the test chamber 200.

[0042] The temperature module 400 includes a cooling structure and a heating structure. The cooling structure and the heating structure are respectively connected to the test chamber 200 and electrically connected to the control module 300. The cooling structure is used to reduce the temperature inside the test chamber 200, and the heating structure is used to heat the temperature inside the test chamber 200.

[0043] The humidity module 500 includes a dry air input structure and a saturated moisture input structure. The dry air input structure and the saturated moisture input structure are respectively connected to the test chamber 200 and electrically connected to the control module 300. The dry air input structure is used to input dry air into the inner cavity of the test chamber 200, thereby reducing the humidity inside the test chamber 200. The saturated moisture input structure is used to input saturated moisture into the inner cavity of the test chamber 200, thereby increasing the humidity inside the test chamber 200.

[0044] The pressure module 600 includes a pressure sealing chamber 610, a positive pressure source, and a negative pressure source. The pressure sealing chamber 610 is disposed in the inner cavity of the test chamber 200. The positive pressure source and the negative pressure source are respectively connected to the pressure sealing chamber 610 and electrically connected to the control module 300. The positive pressure source can pressurize the pressure sealing chamber 610, and the negative pressure source can depressurize the pressure sealing chamber 610.

[0045] It is understood that by using the temperature and pressure calibration device of this embodiment, temperature control, humidity control, and pressure control can be integrated to design a portable integrated temperature, humidity, and pressure calibration device, eliminating the need for separate temperature, humidity, or pressure calibration chambers. Furthermore, since the temperature module 400, humidity module 500, and pressure module 600 are each controlled by the control module 300, the temperature control of the test chamber 200 by the temperature module 400 and the humidity control of the test chamber 200 by the humidity module 500 do not interfere with each other, thus improving the accuracy of temperature and humidity control within the test chamber 200.

[0046] In some embodiments, the temperature, humidity, and pressure calibration device further includes a partition 700 and a fan 800. The partition 700 is disposed in the inner cavity of the test chamber 200, forming a circulating air duct together with the inner wall of the test chamber 200. The fan 800 is disposed in the circulating air duct. Driven by the fan 800, the air in the test chamber 200 can flow along the circulating air duct. By agitating the air with the fan 800, the temperature in the test chamber 200 can be kept uniform, thereby further improving the accuracy of temperature control inside the test chamber 200.

[0047] Specifically, refer to Figure 3 , Figure 4 and Figure 5The arrows in the attached diagram indicate the direction of airflow. In this embodiment, the partition 700 is placed horizontally in the inner cavity of the test chamber 200, dividing the inner cavity of the test chamber 200 into front and rear areas. There are gaps between the left and right ends of the partition 700 and the inner wall of the test chamber 200, so that the front and rear areas of the inner cavity are connected to each other through the gaps at the left and right ends of the partition 700. The spaces on the front, left, rear and right sides of the partition 700 form a circulating air duct. Under the action of the fan 800, the air in the inner cavity of the test chamber 200 can flow around the partition 700.

[0048] In some embodiments, the temperature module 400 includes a temperature measuring element disposed in a circulating air duct and electrically connected to the control module 300. The temperature measuring element is used to acquire the temperature value inside the test chamber 200. The control module 300 can control the cooling structure to perform cooling or control the heating structure to perform heating based on the temperature value acquired by the temperature measuring element.

[0049] In this embodiment, the temperature sensing element is a temperature-controlled platinum resistance thermometer 440.

[0050] In this embodiment, refer to Figure 3 The refrigeration structure includes a refrigerator 410 and a coolant 420. The refrigerator 410 is located outside the test chamber 200 and is electrically connected to the control module 300. The coolant 420 is used to conduct the cooling capacity of the refrigerator 410. The coolant 420 is located in the circulating air duct, and the fan 800 is mounted on the coolant 420. The heating structure is a heating plate 430.

[0051] During temperature control, the refrigerator 410 serves as the cold source, and the control module 300 controls the cooling temperature of the refrigerator 410, which is typically slightly lower than the required temperature of the test chamber 200. After the refrigerator 410 cools and precisely controls the temperature, the cooling capacity of the refrigerator 410 is then transferred to the connected heat exchanger 420, which is installed inside the test chamber 200. A fan 800 installed on the heat exchanger 420 transfers the cooling capacity to the air in the test chamber 200 through forced air convection. After the cooling temperature is kept constant, the control module 300 controls the heating plate 430 to heat the chamber. The control module 300 collects the temperature value of the temperature-controlled platinum resistance thermometer 440 inside the test chamber 200 in real time, and then uses a proportional-integral-derivative (PID) control algorithm to feed back and control the heating amount of the heating plate 430, thereby matching the heating amount with the cooling capacity controlled by the refrigerator 410 and keeping the temperature of the test chamber 200 constant within the target temperature range.

[0052] Since the cooling capacity of the refrigeration unit 410 is constant, and the heating capacity is also constant after matching control, the cold source and heat source in the test chamber 200 are controlled to the minimum and are relatively constant. Therefore, the air in the circulating air duct is stirred by the fan 800 to form a circulating air field, and the temperature in the test chamber 200 is more uniform and remains stable.

[0053] In this embodiment, the temperature measuring element is located on the rear side of the partition 700, while the cooler 420 and the heating plate 430 are located on the front side of the partition 700, which can improve the accuracy of temperature measurement by the temperature measuring element.

[0054] In some embodiments, refer to Figure 4 The humidity module 500 also includes a humidity sensor 550, which is used to acquire the humidity value in the test chamber 200. The humidity sensor 550 is electrically connected to the control module 300. The control module 300 is configured to control the dry gas input structure to perform dry gas input or control the saturated moisture input structure to perform saturated moisture input based on the humidity value acquired by the humidity sensor 550.

[0055] In this embodiment, the dry gas input structure includes a molecular sieve 510 and a first flow pump 520, while the saturated humid gas input structure includes a saturator 530 and a second flow pump 540. The outlet end of the molecular sieve 510 is connected to the inner cavity of the test chamber 200, and the outlet end of the first flow pump 520 is connected to the inlet end of the molecular sieve 510. The outlet end of the saturator 530 is connected to the inner cavity of the test chamber 200, and the outlet end of the second flow pump 540 is connected to the inlet end of the saturator 530. It is understood that the first flow pump 520 and the second flow pump 540 are electrically connected to the control module 300, and the control module 300 can control the start and stop of the first flow pump 520 and the second flow pump 540.

[0056] Molecular sieve 510 is a cubic aluminosilicate compound with a uniform microporous structure and uniform pore diameter. These pores can adsorb molecules smaller than their diameter into the interior of the pores, and have a preferential adsorption capacity for polar and unsaturated molecules. Therefore, it can separate molecules with different degrees of polarity, saturation, molecular size, and boiling point, thus having a "sieving" effect on molecules. It can be understood that molecular sieve 510 has a strong hygroscopic capacity, enabling it to absorb and dry the air entering the test chamber 200, thereby achieving the effect of introducing dry air into the test chamber 200 and reducing the humidity inside the test chamber 200.

[0057] The saturator 530 can turn the air into saturated moisture, which enters the test chamber 200 under the action of the second flow pump 540, thereby increasing the humidity inside the test chamber 200 and achieving a humidification effect.

[0058] When controlling humidity, the control module 300 collects the humidity value of the humidity sensor 550 in the test chamber 200, and then controls the flow rates of the first flow pump 520 and the second flow pump 540 respectively through PID control, so that the different dry and wet air flow rates are mixed in the test chamber 200 and the humidity target value is stably reached.

[0059] In some embodiments, refer to Figure 5 The pressure module 600 also includes a pressure sensor 670, which is used to acquire the pressure value of the pressure sealing chamber 610. The pressure sensor 670 is electrically connected to the control module 300, which is configured to control a positive pressure source to pressurize the inside of the test chamber 200 or control a negative pressure source to depressurize the inside of the test chamber 200 based on the pressure value acquired by the pressure sensor 670.

[0060] In this embodiment, the positive pressure source includes a third flow pump 620 and a gas storage tank 630. The outlet end of the third flow pump 620 is connected to the inlet end of the gas storage tank 630, and the outlet end of the gas storage tank 630 is connected to the pressure sealing chamber 610. The third flow pump 620 is electrically connected to the control module 300. The negative pressure source includes a vacuum pump 650. The inlet end of the vacuum pump 650 is connected to the pressure sealing chamber 610 and is electrically connected to the control module 300.

[0061] In this embodiment, the positive pressure source further includes a first solenoid valve 640, and the negative pressure source further includes a second solenoid valve 660. The first solenoid valve 640 and the second solenoid valve 660 are electrically connected to the control module 300. The first solenoid valve is located between the outlet end of the gas storage tank 630 and the inlet end of the pressure-sealed chamber 610; the second solenoid valve is located between the vacuum pump 650 and the pressure-sealed chamber 610. The positive and negative pressure flow rates are controlled by adjusting the opening degrees of the first solenoid valve and the second solenoid valve 660.

[0062] During testing, the pressure-sealed chamber 610 is placed inside the test chamber 200 for constant temperature control, located behind the partition 700. During pressure control, the control module 300 collects the real-time pressure value from the pressure sensor 670, and then uses a PID control algorithm to adjust the flow rates of the first solenoid valve 640 and the second solenoid valve 660, thereby controlling the positive pressure entering the pressure-sealed chamber 610 and the negative pressure flowing out of the pressure-sealed chamber 610, achieving stable control of the pressure value within the pressure-sealed chamber 610.

[0063] The temperature, humidity, and pressure calibration device of this embodiment uses a refrigerator 410 to maintain a constant cooling temperature and a heating plate 430 to simultaneously control the heating temperature, achieving precise temperature control within the test chamber 200 through dual precise temperature control of cooling and heating. For humidity control, the first flow pump 520 and the second flow pump 540 control the flow rates of dry air and saturated moisture entering the test chamber 200, respectively. A precise ratio of dry air and saturated moisture is mixed within the test chamber 200, thus achieving precise humidity control within the test chamber 200. Because the temperature, humidity, and pressure calibration device includes a gas storage tank 630 and a vacuum pump 650, the pressure values ​​of the pressure-sealed chamber 610 are controlled by adjusting the pressurization flow rate and the depressurization flow rate through the first solenoid valve 640 and the second solenoid valve 660. Placing the pressure-sealed chamber 610 within the test chamber 200 for constant temperature control achieves integrated control of temperature, humidity, and pressure. Temperature, humidity, and pressure calibration can be performed with a single device, making it more portable.

[0064] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A temperature, humidity, and pressure calibration device, characterized in that, include: Testing room; The control module is located on the outside of the test chamber; The temperature module includes a cooling structure and a heating structure, which are respectively connected to the test chamber and electrically connected to the control module. The cooling structure is used to lower the temperature of the test chamber, and the heating structure is used to raise the temperature of the test chamber. The humidity module includes a dry air input structure and a saturated humidity input structure. The dry air input structure and the saturated humidity input structure are respectively connected to the test chamber and electrically connected to the control module. The dry air input structure is used to input dry air into the test chamber, and the saturated humidity input structure is used to input saturated humidity into the test chamber. The pressure module includes a pressure sealing chamber, a positive pressure source, and a negative pressure source. The pressure sealing chamber is located in the test chamber. The positive pressure source and the negative pressure source are respectively connected to the pressure sealing chamber and electrically connected to the control module. The positive pressure source is used to pressurize the pressure sealing chamber, and the negative pressure source is used to depressurize the pressure sealing chamber.

2. The temperature, humidity, and pressure calibration device according to claim 1, characterized in that, The temperature, humidity and pressure calibration device also includes a partition and a fan. The partition is located in the test chamber and together with the inner wall of the test chamber, they form a circulating air duct. The fan is located in the circulating air duct and is used to drive air to flow along the circulating air duct.

3. The temperature, humidity, and pressure calibration device according to claim 2, characterized in that, The temperature module also includes a temperature measuring element, which is disposed in the circulating air duct. The temperature measuring element is electrically connected to the control module, and the control module is configured to control the operation of the refrigeration structure or the heating structure based on the temperature value obtained by the temperature measuring element.

4. The temperature, humidity, and pressure calibration device according to claim 3, characterized in that, The refrigeration structure includes a refrigerator and a coolant. The refrigerator is located outside the test chamber and is electrically connected to the control module. The coolant is used to conduct the cooling capacity of the refrigerator. The coolant is located inside the circulating air duct, and the fan is located on the coolant.

5. The temperature, humidity, and pressure calibration device according to claim 4, characterized in that, The temperature measuring element is located on one side of the partition, and the coolant is located on the other side of the partition.

6. The temperature, humidity, and pressure calibration device according to claim 1, characterized in that, The humidity module further includes a humidity sensor, which is used to acquire the humidity value in the test chamber. The humidity sensor is electrically connected to the control module, and the control module is configured to control the operation of the dry air input structure or the saturated humidity input structure based on the humidity value acquired by the humidity sensor.

7. The temperature, humidity, and pressure calibration device according to claim 1, characterized in that, The dry gas input structure includes a molecular sieve and a first flow pump. The first flow pump is electrically connected to the control module, and the outlet end of the first flow pump is connected to the inlet end of the molecular sieve. The outlet end of the molecular sieve is connected to the interior of the test chamber. The saturated humid gas input structure includes a saturator and a second flow pump. The second flow pump is electrically connected to the control module, and the outlet end of the second flow pump is connected to the inlet end of the saturator. The outlet end of the saturator is connected to the interior of the test chamber.

8. The temperature, humidity, and pressure calibration device according to claim 1, characterized in that, The pressure module also includes a pressure sensor for acquiring the pressure value of the pressure-sealed chamber. The pressure sensor is electrically connected to the control module, which is configured to control the positive pressure source or the negative pressure source to operate based on the pressure value acquired by the pressure sensor.

9. The temperature, humidity, and pressure calibration device according to claim 1, characterized in that, The positive pressure source includes a third flow pump and a gas storage tank. The third flow pump is electrically connected to the control module, and the outlet end of the third flow pump is connected to the inlet end of the gas storage tank. The outlet end of the gas storage tank is connected to the pressure sealing chamber. The negative pressure source includes a vacuum pump. The inlet end of the vacuum pump is connected to the pressure sealing chamber and electrically connected to the control module.

10. The temperature, humidity, and pressure calibration device according to claim 9, characterized in that, The positive pressure source further includes a first solenoid valve, which is connected between the gas storage tank and the pressure sealing chamber; the negative pressure source further includes a second solenoid valve, which is connected between the vacuum pump and the pressure sealing chamber; the first solenoid valve and the second solenoid valve are electrically connected to the control module respectively.

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