Calibration system

Abstract

The utility model relates to a calibration system. The calibration system comprises a test box. The test box comprises an outer cavity and an inner cavity, the outer cavity and the inner cavity are both of a heat preservation structure, a product to be calibrated is suitable for being placed in the inner cavity, at least one circulating pipeline suitable for cooling liquid and / or heating liquid to pass through is arranged in the cavity wall of the inner cavity, an inner cavity heat exchanger is further arranged in the inner cavity, and / or an outer cavity heat exchanger is further arranged in the outer cavity. And the inner cavity heat exchanger and the outer cavity heat exchanger are respectively used for exchanging heat with cooling liquid and / or heating liquid. Therefore, by adopting a double-heat-preservation shell structure and a double-circulation system, the contradiction between the temperature uniformity and the stabilization time of a conventional calibration system can be solved, and the stabilization time of the system is shortened and the calibration efficiency is improved on the premise of ensuring the temperature uniformity of a product.

Description

Technical Field

[0001] The utility model relates to the field of temperature and humidity calibration, in particular to a calibration system. Background Art

[0002] At present, most temperature and humidity calibration devices adopt a working principle similar to that of high and low temperature test chambers. Their technology and functions comply with the requirements of JJF1101-2019 "Calibration Specifications for Temperature and Humidity Parameters of Environmental Test Equipment" and JJF1270-2010 "Calibration Specifications for Temperature, Humidity and Vibration Comprehensive Environmental Test Systems".

[0003] The working principles of heating, cooling, humidification and dehumidification of high and low temperature test chambers are roughly as follows.

[0004] a. Working principle of heating: The heating system of the high and low temperature test chamber generally adopts nickel-chromium alloy electric heating wire for direct heating. When the equipment is working, the circulating fan causes convection of the air in the chamber to take away the heat generated by the heating wire, thereby achieving the effect of heating the air in the chamber; the control system is adjusted by a microcomputer to control the conduction time of the heating wire, so that the heating heat and the loss heat reach a dynamic balance to achieve the purpose of temperature control.

[0005] b. Refrigeration working principle: The refrigeration cycle adopts the reverse Carnot cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, consuming work to increase the exhaust temperature, and then the refrigerant isothermally exchanges heat with the surrounding medium through the condenser to transfer heat to the surrounding medium; then the refrigerant adiabatically expands through the shut-off valve to do work, at which time the refrigerant temperature decreases; the refrigerant isothermally absorbs heat from the object with higher temperature through the evaporator, lowering the temperature of the cooled object; this cycle is repeated to achieve the purpose of cooling.

[0006] c. Working principle of humidification: The humidification system is roughly the same as the heating system. It is the process of the heater heating water into steam to achieve the purpose of humidification of the high and low temperature test chamber.

[0007] d. Working principle of dehumidification: The dehumidification system is also completed by the refrigeration system. The evaporator is placed in a high and low temperature test chamber. The high-humidity gas in the high and low temperature chamber meets the cold evaporator and condenses into liquid. If this is repeated, the high-humidity gas in the chamber will be very little, thus achieving the purpose of dehumidification.

[0008] Most of the existing calibration system devices use similar Figure 1 See Figure 1, the heater, refrigerator, humidifier and dehumidifier are all set inside the insulation shell. The product to be calibrated is placed in a metal box with an insulation layer or a large heat capacity, and then the metal box is placed in the insulation shell to form a double-layer insulation space. The wind wheel drives the air circulation inside the shell, and then the temperature and humidity of the air inside the shell are controlled within the required range through the temperature and humidity controller, so as to reduce the large temperature difference caused by the air flow inside the incubator. The heat capacity of the metal box can filter the temperature fluctuations in the incubator. The larger the heat capacity, the better the filtering performance, but the side effect is that it takes longer to reach a stable uniform temperature in the box. Therefore, Figure 1 The structure shown has a contradiction between temperature uniformity and stabilization time. That is, the thicker the wall of the metal box, the better the temperature uniformity inside the box, but the longer the stabilization time required, and the lower the production efficiency; while if the wall of the metal box is thinner, the stabilization time will be shorter, but the temperature uniformity inside the box will be worse, and it will not meet the calibrated technical requirements.

[0009] Therefore, a new calibration system is needed to solve the contradiction between temperature uniformity and stabilization time in conventional calibration systems. Utility Model Content

[0010] One purpose of the utility model is to solve the contradiction between temperature uniformity and stabilization time existing in a conventional calibration system.

[0011] The utility model provides a calibration system, comprising: a test box, the test box comprising an outer cavity and an inner cavity, both of which are heat-insulating structures, the product to be calibrated is suitable for being placed in the inner cavity, the cavity wall of the inner cavity is provided with at least one circulation pipeline suitable for cooling liquid and / or heating liquid to pass through, the inner cavity is also provided with an inner cavity heat exchanger, and / or the outer cavity is also provided with an outer cavity heat exchanger, the inner cavity heat exchanger and the outer cavity heat exchanger are respectively used for heat exchange with the cooling liquid and / or the heating liquid.

[0012] Optionally, the cavity wall of the outer cavity is composed of a metal material, a thermal insulation material and a first thermal insulation layer bonded together in sequence; the cavity wall of the inner cavity is composed of an aluminum alloy cold plate and a second thermal insulation layer covering the surface of the aluminum alloy cold plate, the aluminum alloy cold plate is a hollow structure, and the circulation pipe is arranged inside the aluminum alloy cold plate.

[0013] Optionally, a circulating air duct, a humidifying device and a dehumidifying device are provided between the outer cavity and the inner cavity, a fan is provided in the circulating air duct, and one or more openings are provided in the cavity wall of the inner cavity. Under the action of the fan, the air in the circulating air duct can be mixed with the air in the inner cavity through the openings. The humidifying device includes a water storage tank, an atomizer and a humidifying pump. The humidifying pump is used to pump water in the water storage tank to the atomizer for atomization treatment, and transport the moisture obtained after the atomization treatment to the circulating air duct through the humidification port. The humidification port is arranged near the circulating fan. The dehumidification device includes a dehumidification tank body and a dehumidification pump. A dehumidifier is provided in the dehumidification tank body. The dehumidification pump is used to pump the air in the circulating air duct to the dehumidification tank body for dehumidification treatment, and transport the dry gas obtained after the dehumidification treatment to the circulating air duct through the dehumidification port. The dehumidification port is arranged near the circulating fan.

[0014] Optionally, a guide plate with radial openings is provided at the bottom of the inner cavity. Under the action of the fan, the air in the circulating air duct enters the inner cavity through the radial openings and re-enters the circulation duct through the opening at the top of the inner cavity.

[0015] Optionally, the humidifying device further comprises a heater, and the heater is used for heating the wet gas.

[0016] Optionally, at least one circulation pipe suitable for cooling liquid and / or heating liquid to pass through is further provided in the circulation air duct.

[0017] Optionally, the calibration system may also include: multiple liquid tanks, the liquids in different liquid tanks are suitable for being heated or cooled to different temperatures, the calibration system is configured to be able to switch the liquid tank from which the liquid flowing into the circulation pipe comes and the liquid tank into which the liquid flowing out of the circulation pipe flows, and the calibration system is also configured to be able to switch the liquid tank used for heat exchange with the inner cavity heat exchanger and / or the outer cavity heat exchanger.

[0018] Optionally, the multiple liquid tanks include a first liquid tank, a second liquid tank, a third liquid tank and a fourth liquid tank, the first liquid tank is provided with a first heating device, the first heating device is used to heat the liquid in the first liquid tank to a first temperature; the second liquid tank is provided with a second heating device, the second heating device is used to heat the liquid in the second liquid tank to a second temperature, the second temperature is close to the first target temperature, the first target temperature is used to characterize the temperature when the product to be calibrated is subjected to a high temperature test, the first temperature is higher than the second temperature, and the difference obtained by subtracting the first temperature from the second temperature is greater than or equal to a first threshold value; the third liquid tank is connected to the first refrigeration device, the first refrigeration device is used to cool the liquid in the third liquid tank to a third temperature; the fourth liquid tank is connected to the second refrigeration device, the second refrigeration device is used to cool the liquid in the fourth liquid tank to a fourth temperature, the fourth temperature is close to the second target temperature, the second target temperature is used to characterize the temperature when the product to be calibrated is subjected to a low temperature test, the third temperature is lower than the fourth temperature, and the difference obtained by subtracting the third temperature from the third temperature is greater than or equal to the second threshold value.

[0019] Optionally, the calibration system also includes a control system, which transports the liquid in the third liquid tank to the circulation pipe, and pushes the liquid originally existing in the circulation pipe to the first liquid tank and / or the second liquid tank for heating standby; in response to the liquid in the circulation pipe being switched to the liquid in the third liquid tank, the control system controls the circulation pipe and the third liquid tank to form a circulation loop; in response to the inner cavity temperature approaching the third target temperature, the control system controls the circulation pipe and the fourth liquid tank to form a circulation loop, and the third target temperature is higher than or equal to the second target temperature; in response to the completion of the test of the product to be calibrated in a low-temperature test environment, the control system transports the liquid in the first liquid tank to the circulation pipe, and pushes the liquid originally existing in the circulation pipe to the third liquid tank and / or the fourth liquid tank for cooling standby; in response to the liquid in the circulation pipe being switched to the liquid in the first liquid tank, the control system controls the circulation pipe and the first liquid tank to form a circulation loop; in response to the inner cavity temperature approaching the fourth target temperature, the control system controls the circulation pipe and the second liquid tank to form a circulation loop, and the fourth target temperature is lower than or equal to the first target temperature.

[0020] Optionally, in response to the inner cavity temperature approaching a third target temperature, the control system also controls the humidification device to increase the inner cavity humidity to a first target humidity, and the first target humidity is used to characterize the humidity in a low-temperature and high-humidity test environment; in response to the product to be calibrated having completed testing in a low-temperature and high-humidity test environment, the control system also controls the dehumidification device to reduce the inner cavity humidity to a second target humidity, and the second target humidity is used to characterize the humidity in a low-temperature and low-humidity test environment; in response to the product to be calibrated having completed testing in a high-temperature and low-humidity test environment, the control system also controls the humidification device to increase the inner cavity humidity to a third target humidity, and the third target humidity is used to characterize the humidity in a high-temperature and high-humidity test environment.

[0021] Optionally, when transporting the liquid in the third liquid tank to the circulation pipeline, the control system also controls the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange circuit with the third liquid tank; when transporting the liquid in the first liquid tank to the circulation pipeline, the control system also controls the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange circuit with the first liquid tank.

[0022] Optionally, the calibration system also includes: a bus, a first inflow pipe and a first outflow pipe connected to the bus, a multi-stage centrifugal pump connected to the first inflow pipe and the first outflow pipe respectively, a four-in-one converter connected to the multi-stage centrifugal pump, and a second inflow pipe and a second outflow pipe corresponding to different liquid tanks connected to the four-in-one converter, and the four-in-one converter is used to control the switching state of the second inflow pipe and the second outflow pipe.

[0023] Optionally, the control system controls the speed of the multi-stage centrifugal pump through a frequency converter; and / or the control system cools and controls the temperature of the liquid in the third liquid tank and / or the fourth liquid tank through a refrigeration control device connected to the first refrigeration device and / or the second refrigeration device; and / or the control system heats and controls the temperature of the liquid in the first liquid tank and / or the second liquid tank through a temperature controller connected to the first heating device and / or the second heating device; and / or the control system controls the working state of the humidifying device and / or the dehumidifying device through a humidity controller to control the humidity of the air in the inner cavity; and / or the control system switches the liquid tank in the circulation loop formed by the circulation pipeline and the liquid tank in the heat exchange loop formed by the external cavity heat exchanger and / or the internal cavity heat exchanger through an electric valve controller.

[0024] Therefore, the calibration system of the utility model can solve the contradiction between temperature uniformity and stabilization time of conventional calibration systems by adopting a double insulation shell structure and a double circulation system. On the premise of ensuring product temperature uniformity, it can shorten the system stabilization time and improve calibration efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.

[0026] Figure 1 It is a schematic diagram showing the structure of an existing calibration system device.

[0027] Figure 2 is a cross-sectional view showing a calibration system according to an embodiment of the present invention.

[0028] Figure 3FIG. 4 is a top view showing a calibration system according to an embodiment of the present invention.

[0029] Figure 4 is a schematic diagram showing the control framework of the calibration system.

[0030] The meanings of the numbers in the figure are as follows: 1. External cavity; 2. Internal cavity; 3. Circulating air duct; 4. Internal cavity bracket; 5. Internal cavity heat exchanger; 6. External cavity heat exchanger; 7. Small water pump; 8. Humidifier; 9. Humidifier pump; 10. Circulating fan; 11. Copper tube; 12. Internal cavity wall circulating duct; 13. Dehumidifier; 14. Dehumidifying centrifugal pump; 15. Internal cavity wall duct; 16. Bus; 17. Guide plate. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0032] Those skilled in the art should understand that the terms "first", "second", etc. in the present invention are used to distinguish similar objects, rather than to describe a specific order or sequence, and have no additional limiting effect.

[0033] The utility model aims to propose a calibration system with a double-shell double-circulation structure to solve the contradiction between temperature uniformity and stabilization time in conventional calibration systems, shorten the stabilization time of the system and improve the calibration efficiency while ensuring the temperature uniformity of the product.

[0034] Uniformity, also known as temperature uniformity, refers to the degree of temperature uniformity at different locations within a period of time in the same space or water bath. It is numerically expressed as the difference between the highest temperature value and the lowest temperature value among multiple test sites.

[0035] The calibration system proposed in the utility model includes a test box. The test box can also be called a calibration box. The test box includes an outer cavity and an inner cavity, and both the outer cavity and the inner cavity are heat-insulating structures. That is, the test box is a double-layer heat-insulating structure. The product to be calibrated is suitable for being placed in the inner cavity. Exemplarily, a hanger for placing the product can be provided in the inner cavity, and the product to be calibrated can be placed on the hanger. The product to be calibrated can be, but is not limited to, a temperature and humidity sensor.

[0036] At least one circulation pipeline suitable for cooling liquid and / or heating liquid to pass through is provided in the cavity wall of the inner cavity. The liquid flowing through the circulation pipeline can be switched as needed. For example, when it is necessary to lower the temperature of the inner cavity to construct a low-temperature test environment, the liquid flowing through the circulation pipeline can be switched to a cooling liquid to achieve the purpose of lowering the temperature of the inner cavity. For another example, when it is necessary to increase the temperature of the inner cavity to construct a high-temperature test environment, the liquid flowing through the circulation pipeline can be switched to a heating liquid to achieve the purpose of increasing the temperature of the inner cavity. Cooling liquid refers to a liquid with a relatively low temperature after cooling treatment. Heating liquid refers to a liquid with a relatively high temperature after heating treatment. The medium type of cooling liquid and heating liquid can be water, a mixed liquid of water and alcohol, or other types of liquids.

[0037] An inner cavity heat exchanger is also provided in the inner cavity, and / or an outer cavity heat exchanger is also provided in the outer cavity. The inner cavity heat exchanger and the outer cavity heat exchanger are used to exchange heat with the cooling liquid and / or the heating liquid respectively. The inner cavity heat exchanger and / or the outer cavity heat exchanger can accelerate the temperature adjustment rate of the inner cavity and the outer cavity of the test box and shorten the stabilization time of the system.

[0038] The calibration system of the utility model can have good temperature uniformity by adopting a double shell insulation structure. At the same time, the calibration system of the utility model can improve the temperature adjustment rate of the test box by adopting a double circulation structure including a circulation pipeline, an inner cavity heat exchanger and / or an outer cavity heat exchanger, shorten the stabilization time under the premise of ensuring the temperature uniformity of the test box, thereby solving the contradiction between temperature uniformity and stabilization time existing in conventional calibration systems.

[0039] The following is a further description of the details involved in the present utility model.

[0040] The cavity wall of the outer cavity may adopt a heat-insulating layer structure. Exemplarily, the cavity wall of the outer cavity may be a first heat-insulating layer in the form of a sandwich formed by sequentially bonding a metal material, a heat-insulating material, and a metal material. The heat-insulating material may be, but is not limited to, polyurethane, such as hard foamed polyurethane.

[0041] The cavity wall of the inner cavity may be composed of an aluminum alloy cold plate and a second insulation layer covering the surface of the aluminum alloy cold plate. The aluminum alloy cold plate may be a hollow structure, and the circulation pipeline may be arranged inside the aluminum alloy cold plate. Exemplarily, the circulation pipeline may be assembled by enclosing the hollowed-out aluminum alloy cold plate. The second insulation layer may be a thickened insulation layer pasted on the outer surface (i.e., the outer wall) of the aluminum alloy cold plate. The material of the second insulation layer may be, but is not limited to, insulation cotton.

[0042] A circulating air duct, a humidifying device and a dehumidifying device may also be provided between the outer cavity and the inner cavity.

[0043] A fan is arranged in the circulating air duct, and an opening is arranged in the cavity wall of the inner cavity. Under the action of the fan, the air in the circulating air duct can be mixed with the air in the inner cavity through the opening.

[0044] Exemplarily, the humidifying device may include a water storage tank, an atomizer, and a humidifying pump. The humidifying principle of the humidifying device can be described as follows: when the humidity of the air in the inner cavity needs to be increased, the humidifying pump can be controlled to pump the water in the water storage tank to the atomizer for atomization to obtain atomized moisture; then the atomized moisture can be transported to the circulating air duct through the humidifying port; under the action of the fan in the circulating duct, the moisture can be mixed with the air in the inner cavity to increase the humidity of the air in the inner cavity. Repeatedly, the humidity of the air in the inner cavity can be increased to a predetermined value. Optionally, the humidifying device may also include a heater, which is used to heat the moisture, such as heating the temperature of the moisture to a temperature close to the temperature of the inner cavity. In the present utility model, temperature A is close to temperature B, including two situations where temperature A is the same as temperature B, and temperature A is different from temperature B but the difference between temperature A and temperature B is a small value (such as the difference is lower than a predetermined threshold). The humidifying pump can transport the atomized and heated moisture to the circulating air duct through the humidifying port. In this way, when the humidity of the air in the inner cavity is increased, the impact on the temperature of the inner cavity can be minimized, thereby improving the uniformity of the temperature of the inner cavity.

[0045] Exemplarily, the dehumidification device may include a dehumidification tank and a dehumidification pump. A dehumidifier is provided in the dehumidification tank. The dehumidification principle of the dehumidification device can be described as follows: when the humidity of the air in the inner cavity needs to be reduced, the dehumidification pump can be controlled to pump the air in the circulating air duct to the dehumidification tank for dehumidification; then the dry gas after the dehumidification treatment is transported to the circulating air duct through the dehumidification port; under the action of the fan in the circulating duct, the dry gas after the dehumidification treatment can be mixed with the air in the inner cavity to reduce the humidity of the air in the inner cavity. Repeating this process, the humidity of the air in the inner cavity can be reduced to a predetermined value.

[0046] The humidification port and the dehumidification port can be arranged near the circulating fan, so that the travel of the mixed air can be increased, so that the high-concentration moisture or the dry gas after dehumidification can be fully mixed with the air in the inner cavity.

[0047] A guide plate with radial openings may be provided at the bottom of the inner cavity. Under the action of the fan, the air in the circulating air duct may enter the inner cavity through the radial openings, and may re-enter the circulation duct through the opening at the top of the inner cavity. The guide plate with radial openings may minimize the effect of excessive concentration of airflow at the air duct outlet on the temperature uniformity of the inner cavity. The opening at the top of the inner cavity may also be a radial opening.

[0048] At least one circulation pipe suitable for cooling medium and / or heating medium to pass through may also be provided in the circulation air duct. Exemplarily, the circulation pipe provided in the circulation air duct may be a metal pipe, such as a copper pipe. Similar to the circulation pipe provided in the cavity wall of the inner cavity, the liquid flowing through the circulation pipe provided in the circulation air duct may also be switched as required. By providing the circulation pipe in the circulation air duct, the temperature adjustment rate of the inner cavity may be further improved, and the stabilization time of the system may be shortened.

[0049] The calibration system may also include multiple (at least two) liquid tanks. The liquids in different liquid tanks are suitable for being heated or cooled to different temperatures. These multiple liquid tanks can provide cooling liquid and heating liquid for the circulation pipeline arranged in the cavity wall of the inner cavity and the circulation pipeline arranged in the circulation air duct, and can also provide cooling liquid and heating liquid required for heat exchange for the outer cavity heat exchanger and the inner cavity heat exchanger. The calibration system can be configured to be able to switch the liquid tank from which the liquid flowing into the circulation pipeline comes and the liquid tank into which the liquid flowing out of the circulation pipeline flows. The calibration system can also be configured to be able to switch the liquid tank used for heat exchange with the inner cavity heat exchanger and / or the outer cavity heat exchanger. Exemplarily, the calibration system can control the switching of cooling liquid and heating liquid in the circulation pipeline by an electric valve, and can also control the switching of cooling liquid and heating liquid in the heat exchange circuit of the outer cavity heat exchanger and the inner cavity heat exchanger by an electric valve.

[0050] In some embodiments, the calibration system may include four liquid tanks, namely a first liquid tank, a second liquid tank, a third liquid tank, and a fourth liquid tank.

[0051] The first liquid tank may also be referred to as a preheating tank, and the second liquid tank may also be referred to as a hot tank. A first heating device may be provided in the first liquid tank, and the first heating device may be, but not limited to, a heating rod. The first heating device is used to heat the liquid in the first liquid tank to a first temperature. A second heating device is provided in the second liquid tank, and the second heating device may be, but not limited to, a heating rod. The second heating device is used to heat the liquid in the second liquid tank to a second temperature, and the second temperature is close to the first target temperature, and the first target temperature is used to characterize the temperature when the product to be calibrated is subjected to a high temperature test. The first temperature is higher than the second temperature, and the difference obtained by subtracting the second temperature from the first temperature is greater than or equal to a first threshold value. That is, it can be considered that the first temperature is much higher than the second temperature.

[0052] The third liquid tank may also be referred to as a pre-cooling tank, and the fourth liquid tank may also be referred to as a cold tank. The third liquid tank may be connected to the first refrigeration device, and the first refrigeration device is used to cool the liquid in the third liquid tank to a third temperature. The fourth liquid tank is connected to the second refrigeration device, and the second refrigeration device is used to cool the liquid in the fourth liquid tank to a fourth temperature, and the fourth temperature is close to the second target temperature, and the second target temperature is used to characterize the temperature when the product to be calibrated is subjected to a low temperature test, and the third temperature is lower than the fourth temperature, and the difference obtained by subtracting the third temperature from the fourth temperature is greater than or equal to the second threshold value. That is, it can be considered that the first temperature is much higher than the second temperature. Among them, the first refrigeration device and the second refrigeration device are both external refrigeration devices. The first refrigeration device and the second refrigeration device may be the same set of refrigeration devices, or they may be two independent refrigeration devices. Exemplarily, the first refrigeration device and the second refrigeration device may be the same set of refrigeration devices, and the set of refrigeration devices may include a double peptide gun and an outdoor refrigerant.

[0053] The test environment for calibrating the product to be calibrated is generally divided into low temperature test environment and high temperature test environment. The low temperature test environment can be further divided into low temperature and low humidity test environment and low temperature and high humidity test environment. Correspondingly, the high temperature test environment can be further divided into high temperature and low humidity test environment and high temperature and high humidity test environment.

[0054] The calibration system of the utility model can be operated in the order of low temperature and high humidity -> low temperature and low humidity -> high temperature and low humidity -> high temperature and high humidity, that is, a low temperature and high humidity test environment can be provided first, followed by a low temperature and low humidity test environment, then a high temperature and low humidity test environment, and finally a high temperature and high humidity test environment. Optionally, the calibration system can also be operated in the order of low temperature and low humidity -> low temperature and high humidity -> high temperature and high humidity -> high temperature and low humidity.

[0055] The calibration system may also include a control system. Taking the operation in the order of low temperature and high humidity -> low temperature and low humidity -> high temperature and low humidity -> high temperature and high humidity as an example, the calibration system may provide different test environments in the order of low temperature and high humidity -> low temperature and low humidity -> high temperature and low humidity -> high temperature and high humidity under the control of the control system.

[0056] Specifically, the control system can first transport the liquid in the third liquid tank to the circulation pipeline, and push the liquid originally existing in the circulation pipeline (such as liquid at room temperature) to the first liquid tank and / or the second liquid tank for heating and standby.

[0057] In response to the liquid in the circulation pipeline being switched to the liquid in the third liquid tank, the control system can control the circulation pipeline and the third liquid tank to form a circulation loop. The circulation pipeline and the third liquid tank are controlled to form a circulation loop, that is, the inlet and outlet of the circulation pipeline are respectively connected to the outlet and inlet of the third liquid tank to form a cooling liquid circulation loop of the third temperature.

[0058] In response to the inner cavity temperature approaching the third target temperature, the control system can control the circulation pipeline and the fourth liquid tank to form a circulation loop for precise temperature control. The third target temperature is higher than or equal to the second target temperature. The circulation pipeline and the fourth liquid tank are controlled to form a circulation loop, that is, the inlet and outlet of the circulation pipeline are respectively connected to the outlet and inlet of the fourth liquid tank to form a cooling liquid circulation loop of the fourth temperature. By first using the third liquid tank to quickly cool the inner cavity temperature, the fourth liquid tank is used to accurately control the inner cavity temperature when the inner cavity temperature approaches the second target temperature (i.e., the low temperature test temperature). In this way, the low temperature adjustment rate of the test chamber can be increased and the stabilization time can be shortened.

[0059] In response to the inner cavity temperature approaching the third target temperature, the control system can also increase the inner cavity humidity to the first target humidity by controlling the humidification device, and the first target humidity is used to characterize the humidity in the low temperature and high humidity test environment. In this way, a low temperature and high humidity test environment can be constructed. After the low temperature and high humidity test environment is constructed, the product to be calibrated can be tested and calibrated in the low temperature and high humidity environment.

[0060] In response to the completion of the test of the product to be calibrated in the low temperature and high humidity environment, the control system can also control the dehumidification device to reduce the humidity of the inner cavity to a second target humidity, and the first target humidity is used to characterize the humidity in the low temperature and low humidity test environment. In this way, a low temperature and low humidity test environment can be constructed. After the low temperature and low humidity test environment is constructed, the product to be calibrated can be tested and calibrated in the low temperature and low humidity environment.

[0061] In addition, in the process of transporting the liquid in the third liquid tank to the circulation pipeline, the control system can also control the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange loop with the third liquid tank. In this way, the low temperature adjustment rate of the test box can be further improved and the stabilization time can be shortened under the heat exchange effect of the external cavity heat exchanger and / or the internal cavity heat exchanger. It should be noted that in response to the inner cavity temperature approaching the third target temperature, the control system can control the external cavity heat exchanger and / or the internal cavity heat exchanger to stop heat exchange, and only perform precise temperature control through the circulation pipeline.

[0062] In response to the completion of testing of the product to be calibrated in a low-temperature test environment (including a low-temperature and high-humidity test environment and a low-temperature and low-humidity test environment), the control system can first transport the liquid in the first liquid tank to the circulation pipeline, and push the liquid originally existing in the circulation pipeline (such as cooling liquid) to the third liquid tank and / or the fourth liquid tank for cooling and standby.

[0063] In response to the liquid in the circulation pipeline being switched to the liquid in the first liquid tank, the control system can control the circulation pipeline and the first liquid tank to form a circulation loop. The circulation pipeline and the first liquid tank are controlled to form a circulation loop, that is, the inlet and outlet of the circulation pipeline are respectively connected to the outlet and inlet of the first liquid tank to form a heating liquid circulation loop of the first temperature.

[0064] In response to the inner cavity temperature approaching the fourth target temperature, the control system controls the circulation pipeline and the second liquid tank to form a circulation loop for precise temperature control. The fourth target temperature is lower than or equal to the first target temperature. The circulation pipeline and the second liquid tank are controlled to form a circulation loop, that is, the inlet and outlet of the circulation pipeline are respectively connected to the outlet and inlet of the second liquid tank to form a heating liquid circulation loop of the second temperature. By first using the first liquid tank to quickly heat up the inner cavity temperature, the second liquid tank is used to accurately control the inner cavity temperature when the inner cavity temperature approaches the first target temperature (i.e., the high temperature test temperature). In this way, the high temperature adjustment rate of the test chamber can be increased and the stabilization time can be shortened.

[0065] In addition, in the process of transporting the liquid in the first liquid tank to the circulation pipeline, the control system can also control the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange loop with the first liquid tank. In this way, the high temperature regulation rate of the test box can be further improved and the stabilization time can be shortened under the heat exchange effect of the external cavity heat exchanger and / or the internal cavity heat exchanger. It should be noted that in response to the inner cavity temperature approaching the fourth target temperature, the control system can control the external cavity heat exchanger and / or the internal cavity heat exchanger to stop heat exchange, and only perform precise temperature control through the circulation pipeline.

[0066] By using the second liquid box to accurately control the temperature of the inner cavity, a high-temperature test environment can be constructed. At this time, the humidity of the inner cavity is a low-humidity environment. Therefore, by using the second liquid box to accurately control the temperature of the inner cavity, a high-temperature and low-humidity test environment can be directly obtained. After obtaining the high-temperature and low-humidity test environment, the product to be calibrated can be tested and calibrated in the high-temperature and low-humidity environment.

[0067] In response to the product to be calibrated being tested in the high temperature and low humidity test environment, the control system may also control the humidification device to increase the humidity of the inner cavity to a third target humidity, and the third target humidity is used to characterize the humidity in the high temperature and high humidity test environment. The third target humidity may be equal to the first target humidity. In this way, a high temperature and high humidity test environment may be constructed. After the high temperature and high humidity test environment is constructed, the product to be calibrated may be tested and calibrated in the high temperature and high humidity environment.

[0068] In some embodiments, the calibration system may further include: a bus, a first inflow pipe and a first outflow pipe connected to the bus, a multistage centrifugal pump connected to the first inflow pipe and the first outflow pipe respectively, a four-in-one converter connected to the multistage centrifugal pump, and second inflow pipes and second outflow pipes corresponding to different liquid tanks connected to the four-in-one converter. The four-in-one converter can control the switching states of the second inflow pipes and the second outflow pipes of different liquid tanks.

[0069] Exemplarily, the control system can control the speed of the multistage centrifugal pump through a frequency converter. The control system can refrigerate and control the temperature of the liquid in the third liquid tank and / or the fourth liquid tank through a refrigeration control device connected to the first refrigeration device and / or the second refrigeration device. The control system heats and controls the temperature of the liquid in the first liquid tank and / or the second liquid tank through a thermostat connected to the first heating device and / or the second heating device. The control system controls the working state of the humidifying device and / or the dehumidifying device through a humidity controller to control the humidity of the air in the inner cavity. The control system can switch the liquid tank in the circulation loop formed by the circulation pipeline and the liquid tank in the heat exchange loop formed by the outer cavity heat exchanger and / or the inner cavity heat exchanger through an electric valve controller. That is, the control system can switch the liquid in the circulation pipeline and the liquid that performs heat exchange with the outer cavity heat exchanger and / or the inner cavity heat exchanger through an electric valve.

[0070] Figure 2 is a cross-sectional view showing a calibration system according to an embodiment of the present invention.

[0071] Figure 3 FIG. 4 is a top view showing a calibration system according to an embodiment of the present invention.

[0072] Combine the following Figure 2 , Figure 3 The structure of the calibration system is described as an example.

[0073] See also Figure 2 The overall structure of the calibration system is a double-layer insulation plus a double circulation system.

[0074] Double-layer insulation means that both the outer cavity 1 and the inner cavity 2 are insulation structures. The outer cavity 1 (i.e., the outer shell) is an insulation layer in the form of a metal-polyurethane-metal sandwich. The insulation layer of the outer cavity 1 is a three-layer structure, with metal plates inside and outside, and a hard foamed polyurethane insulation layer in the middle. The inner cavity 2 is assembled by enclosing aluminum alloy cold plates. A thickened insulation layer (such as insulation cotton) is pasted on the outer surface of the aluminum alloy cold plate. The aluminum alloy cold plate is equivalent to the cavity wall of the inner cavity 2 mentioned above. An inner cavity hanging wall 4 is provided in the inner cavity 2, and the product to be calibrated is placed on the inner cavity hanger 4 from the inside to the outside.

[0075] The inside of the aluminum alloy cold plate is a hollowed-out water channel. The water channel is opened in the middle of the cold plate. The water channel is equivalent to the circulation pipe arranged in the cavity wall of the inner cavity mentioned above, that is, the inner cavity wall circulation pipe 12 shown in the figure. The dual circulation system refers to a water circulation system composed of a water channel arranged in the cavity wall of the inner cavity 2 (that is, the inner cavity wall circulation pipe 12), and an inner and outer cavity heat exchange circulation system composed of an inner cavity heat exchanger 5 and an outer cavity heat exchanger 6. The water circulation system can adjust and stabilize the inner cavity temperature, and the inner and outer heat exchangers can accelerate the cold and hot switching rate of the inner and outer cavities.

[0076] The side of the inner cavity 2 can be connected by a stainless steel circular tubular circulation duct 3. A circulation fan 10 is arranged in the upper middle part of the circulation duct to drive the air circulation in the inner cavity. The cavity wall of the inner cavity 2 is an aluminum alloy cold plate, and the cooling medium or heating medium (generally a mixture of pure water and ethylene glycol, which can be replaced by municipal tap water during debugging) for adjusting the temperature is commonly used inside the aluminum alloy cold plate. The cold and hot media inside the aluminum alloy cold plate can be switched by switching the connection of the medium pipeline, thereby controlling the temperature of the inner cavity. The medium (i.e., liquid) inside the aluminum alloy cold plate (i.e., in the water channel) can be connected in parallel to the bus 16 through the inner cavity wall pipeline 15. Multiple circulation duct heating / cooling copper tubes 11 (equivalent to the circulation pipeline set in the circulation duct mentioned above) can also be wrapped outside the circulation duct 3. The copper tube 11 and the cold plate circulation water circuit (i.e., the inner cavity wall circulation pipeline 12) can be connected in parallel to the inner cavity wall pipeline 15, and connected in parallel to the bus 16 through the inner cavity wall pipeline 15. The copper tube 11 can be wound around the air duct tube close to the circulating air duct 3. The water inlet and outlet of the copper tube 11 are connected in parallel with the water inlet and outlet of the cold water plate (i.e. the inner cavity wall circulating pipe 12), and are also from the water tank.

[0077] In order to balance the pressure of each cold plate, the copper tube can be divided into 4 sections, which are connected in parallel with the 4 water channels of the two cold water plates. The copper tube 11 and the cold water plate can cool and heat the air in the inner cavity at the same time, and adjust and stabilize the temperature of the inner cavity.

[0078] In order to accelerate the heating and cooling of the air in the inner cavity, an inner cavity heat exchanger 5 and an outer cavity heat exchanger 6 are respectively provided in the inner cavity 2 and the outer cavity 1. A humidifier 8 and a dehumidifier 13 are also provided for the inner cavity 2, both of which are arranged on the circulating air duct 3 of the inner cavity 2. The inner cavity 2 has a high requirement for temperature uniformity. In order to minimize the impact on the temperature uniformity of the inner cavity 2, the humidification port of the humidifier 8 and the dehumidification port of the dehumidifier 13 are both arranged near the circulating fan, so that the high-concentration moisture and the air in the inner cavity are fully mixed, increasing the stroke of the mixed air, and entering the inner cavity 2 after passing through the radial opening guide plate 17, in order to eliminate the impact of the airflow of the circulating fan on the temperature uniformity of the inner cavity 2 as much as possible. The humidifier 8 can be composed of a water storage tank, an atomizer, a heater and a humidification pump 9, and the dehumidifier 13 can be composed of a dehumidification tank body, a dehumidifier and a dehumidification centrifugal pump 14.

[0079] The inner cavity wall pipe 15 can be divided into 8 routes and connected in parallel to the bus 16. The inlet and outlet water main pipes of the bus 16 (equivalent to the first inflow pipe and the first outflow pipe mentioned above) pass through the cavity wall of the outer cavity 1 and are connected to a multi-stage centrifugal pump, and then a pipeline loop is formed by a four-in-one converter and four water tanks. The four-in-one converter can be connected to the inlet and outlet pipes of each water tank (equivalent to the second inflow pipe and the second outflow pipe mentioned above) respectively, and the inlet and outlet pipes of each water tank are independently controlled by an electric valve. The four water tanks include a hot water tank, a preheating water tank, a precooling water tank and a cold water tank. The preheating water tank is equivalent to the first liquid tank mentioned above. The hot water tank is equivalent to the second liquid tank mentioned above. The precooling water tank is equivalent to the third liquid tank mentioned above. The cold water tank is equivalent to the fourth liquid tank mentioned above. The hot water tank and the preheating water tank are also provided with their own heating and internal circulation systems. The precooling water tank, cold water tank, refrigerator titanium gun (cold water exchanger, double interface) and refrigeration outdoor unit form a refrigeration circuit. The pipes of the inner cavity heat exchanger 5 and the outer cavity heat exchanger 6 are respectively connected in parallel to the preheating water tank and the precooling water tank to form a small heat exchange circulation loop. The small heat exchange circulation loop is driven by a small water pump 7. The hot and cold media in each circuit can be switched by an electric valve.

[0080] The system can be operated in the order of low temperature and high humidity -> low temperature and low humidity -> high temperature and low humidity -> high temperature and high humidity. First, turn on the refrigerator and the heater to cool / heat the water level in the water tank to the set temperature. The equipment is running at low temperature. After the low temperature test is completed, it needs to be switched to high temperature. First, open the preheating water tank and the precooling water tank, replace the cold water in the cold plate and the water circuit with hot water, and then switch to the hot water tank. After the high temperature test is completed, switch to low temperature again, open the precooling water tank and the preheating water tank, and replace the hot water in the cold plate and the water circuit with cold water. During this period, the product can be taken and installed, and then the system starts a new test cycle. The outer cavity heat exchanger 6 and the inner cavity heat exchanger 5 are turned on when the hot and cold water are exchanged to speed up the temperature stabilization rate. The winding copper tube outside the air duct and the cold row (that is, the inner cavity wall circulation pipe 12) are always connected in parallel, and the outer layer of the inner cavity is all wrapped with thermal insulation cotton to isolate the heat exchange inside and outside the cavity.

[0081] Figure 4 is a schematic diagram showing the control framework of the calibration system.

[0082] See also Figure 4 , the control mode of the calibration system is that each unit is controlled independently. The PC-side host computer (i.e., the PC-side control system shown in the figure) is equivalent to the control system mentioned above. The PC-side host computer can monitor and adjust parameters of all control units. Among them, the exchange pump shown in the figure corresponds to the humidification pump 9 and the dehumidification centrifugal pump 14 mentioned above. Among them, the humidification pump 9 and the dehumidification centrifugal pump 14 can be in an interlocking linkage state. That is, when one of the humidification pump 9 and the dehumidification centrifugal pump 14 is working, the other stops working.

[0083] As shown on the right side of Figure 4, the calibration system mainly consists of the following six control parts. Among them, the PC-side control system and each controller (such as the frequency converter, water chiller controller, water tank thermostat, external cavity thermostat, humidity and electric valve controller shown in the figure) can be connected through a serial bus (such as RS485 bus). ① The frequency converter and the main circulation pump (that is, the multi-stage centrifugal pump) form a closed-loop control, which can control the speed of the motor in real time. ② The water chiller controller (corresponding to the refrigeration control device mentioned above) and the water chiller (corresponding to the refrigeration device mentioned above) form a refrigeration circuit, which can cool the water in the cold water tank and the pre-cooling water tank and monitor the temperature. ③ The water tank thermostat and the heating rod (corresponding to the heating device mentioned above) form a heating control circuit, which can heat and monitor the temperature of the water in the hot water tank and the pre-cooling water tank. ④ The external cavity thermostat controls the operation of the water pump and controls the water pump when the temperature changes (corresponding to Figure 2 The small water pump 7) in the chamber starts and stops to transport the water from the cold / hot water tank to the inner and outer cavity exchangers for heat exchange, thereby achieving the purpose of temperature control. The outer cavity temperature controller can also control the operation of the fan in the circulation pipe. ⑤ The humidity controller controls the operation of the exchange pump and the solenoid valve for pipeline switching. When the relative humidity is too high, the drying pipe is opened to draw the air in the cavity to the dryer for drying. If the relative humidity is too low, turn on the air pump (i.e., the humidification pump 9) to pump humid air with a relative humidity close to saturation into the cavity, thereby achieving the purpose of humidity control. ⑥ The electric valve controller is used to control the switching of circulating water in the test chamber pipeline (including the inner cavity wall circulation pipeline 12 and the copper tube 11), as well as the switching of hot and cold water in the inner and outer cavity heat exchangers.

[0084] In addition, the PC-side control system can also obtain sensor data collected by the return water thermometer, pressure sensor, and water level sensor, and perform corresponding control operations based on these sensor data. For example, the return water thermometer is used to monitor the system return water temperature. The purpose is to switch between hot and cold water. The PC-side control system can sense whether the hot and cold water switch is completed through temperature changes. The pressure sensor and water level sensor are used to monitor the water level height of the water tank for high water level protection, ensuring that the water level in the water tank is within the controlled range when switching between hot and cold water.

[0085] The operation logic of the calibration system is as follows: each water tank is precooled / preheated to the set temperature first; through the scheduling controlled by the PC end, the cold water in the precooling water tank is first used to push the normal temperature water in the inner cavity pipe to the preheating water tank for heating and standby; after the inner cavity pipe is switched to cold water, the cold water in the inner cavity pipe and the precooling water tank are driven to circulate to achieve the purpose of rapid cooling; when approaching the temperature target value, switch to the cold water tank for precise control, and turn on the humidity controller to control the humidity in the cavity; when switching to heating, the hot water in the preheating water tank is used to push the cold water in the inner cavity pipe back to the precooling water tank, and then switch to the preheating water tank for circulation for rapid heating; when approaching the target value, switch to the hot water tank for precise temperature control, and turn on the humidity controller to control the humidity in the cavity. At this point, a calibration cycle of the system is completed.

[0086] The calibration system of the utility model is a complete test environment system that can provide an inner cavity environment with high uniform temperature difference and high stability humidity difference, providing an accurate and reliable temperature and humidity test platform for the smooth entry of high-precision products into mass production. Among them, the high stability humidity difference is similar to the high uniform temperature difference, which means that the difference between the highest humidity value and the lowest humidity value is very small.

[0087] The calibration system of the utility model adopts a double insulation shell structure and a double circulation water system, which is much more stable than the single shell and double shell without water system. It can also significantly reduce the hot and cold switching time of the system and improve the product calibration time. In addition, the inner cavity space can be set to about 0.5x0.5x1m, which can test more products at one time and improve product production efficiency.

[0088] The heat-insulating layers of the inner cavity and the outer cavity of the utility model can also be replaced by vacuum layers.

[0089] In summary, the calibration system of the utility model can solve the contradiction between the temperature uniformity and the stabilization time of the conventional calibration system by adopting a double-shell double-circulation structure. Under the premise of ensuring the temperature uniformity of the product, it can shorten the stabilization time of the system and improve the calibration efficiency. In addition, the calibration system of the utility model can provide a temperature and humidity environment with continuous, stable and high-precision temperature uniformity, and realize automatic switching and adjustment of temperature and humidity, meeting the temperature and humidity requirements required for scientific research and metrological testing.

[0090] The calibration system according to the present invention has been described in detail above with reference to the accompanying drawings.

[0091] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system and method according to multiple embodiments of the utility model. In this regard, each box in the flow chart or block diagram can represent a part of a module, a program segment or a code, and the part of the module, the program segment or the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or the flow chart, and the combination of the boxes in the block diagram and / or the flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0092] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A calibration system, characterized in that: include: Test chamber, The test box comprises an outer cavity and an inner cavity, both of which are heat-insulating structures. The product to be calibrated is suitable for being placed in the inner cavity, The inner wall of the inner cavity is provided with at least one circulation pipeline suitable for cooling liquid and / or heating liquid to pass through. An inner cavity heat exchanger is also provided in the inner cavity, and / or an outer cavity heat exchanger is also provided in the outer cavity, and the inner cavity heat exchanger and the outer cavity heat exchanger are respectively used for heat exchange with cooling liquid and / or heating liquid.

2. The calibration system according to claim 1, characterized in that The cavity wall of the outer cavity is a first thermal insulation layer formed by sequentially bonding a metal material, a thermal insulation material, and a metal material; The cavity wall of the inner cavity is composed of an aluminum alloy cold plate and a second insulation layer covering the surface of the aluminum alloy cold plate. The aluminum alloy cold plate is a hollow structure, and the circulation pipeline is arranged inside the aluminum alloy cold plate.

3. The calibration system according to claim 1, characterized in that: A circulating air duct, a humidifying device and a dehumidifying device are provided between the outer cavity and the inner cavity. A circulating fan is provided in the circulating air duct, and one or more openings are provided in the cavity wall of the inner cavity. Under the action of the circulating fan, the air in the circulating air duct can be mixed with the air in the inner cavity through the openings. The humidification device comprises a water storage tank, an atomizer and a humidification pump. The humidification pump is used to pump water in the water storage tank to the atomizer for atomization, and to transport the moisture obtained after the atomization to the circulating air duct through a humidification port. The humidification port is arranged near the circulating fan. The dehumidification device includes a dehumidification tank body and a dehumidification pump. The dehumidification tank body is provided with a dehumidifier. The dehumidification pump is used to pump the air in the circulating air duct to the dehumidification tank body for dehumidification treatment, and transport the dry gas obtained after the dehumidification treatment to the circulating air duct through a dehumidification port. The dehumidification port is arranged near the circulating fan.

4. The calibration system according to claim 3, characterized in that: A guide plate with radial openings is provided at the bottom of the inner cavity. Under the action of the circulating fan, the air in the circulating air duct enters the inner cavity through the radial openings and re-enters the circulating duct through the opening at the top of the inner cavity.

5. The calibration system according to claim 3, characterized in that: The humidifying device further comprises a heater, and the heater is used for heating the wet gas.

6. The calibration system according to claim 3, characterized in that: The circulating air duct is also provided with at least one circulating pipe suitable for cooling liquid and / or heating liquid to pass through.

7. The calibration system according to any one of claims 3 to 6, characterized in that Also includes: Multiple liquid tanks, the liquids in different liquid tanks are suitable for being heated or cooled to different temperatures, The calibration system is configured to be able to switch the liquid tank from which the liquid flowing into the circulation pipe comes and the liquid tank into which the liquid flowing out of the circulation pipe flows, and The calibration system is further configured to be able to switch a liquid tank used for heat exchange with the inner cavity heat exchanger and / or the outer cavity heat exchanger.

8. The calibration system according to claim 7, characterized in that The plurality of liquid tanks include a first liquid tank, a second liquid tank, a third liquid tank and a fourth liquid tank, A first heating device is provided in the first liquid tank, and the first heating device is used to heat the liquid in the first liquid tank to a first temperature; A second heating device is provided in the second liquid tank, and the second heating device is used to heat the liquid in the second liquid tank to a second temperature, the second temperature is close to a first target temperature, the first target temperature is used to characterize the temperature of the product to be calibrated when a high temperature test is performed, the first temperature is higher than the second temperature, and the difference obtained by subtracting the second temperature from the first temperature is greater than or equal to a first threshold value; The third liquid tank is connected to a first refrigeration device, and the first refrigeration device is used to cool the liquid in the third liquid tank to a third temperature; The fourth liquid tank is connected to a second refrigeration device, and the second refrigeration device is used to cool the liquid in the fourth liquid tank to a fourth temperature. The fourth temperature is close to a second target temperature. The second target temperature is used to characterize the temperature when a low-temperature test is performed on the product to be calibrated. The third temperature is lower than the fourth temperature, and a difference between the fourth temperature and the third temperature is greater than or equal to a second threshold value.

9. The calibration system according to claim 8, characterized in that Also includes: Control systems, The control system transports the liquid in the third liquid tank to the circulation pipeline, and pushes the liquid originally existing in the circulation pipeline to the first liquid tank and / or the second liquid tank for heating and standby; In response to the liquid in the circulation pipeline being switched to the liquid in the third liquid tank, the control system controls the circulation pipeline and the third liquid tank to form a circulation loop; In response to the inner cavity temperature approaching a third target temperature, the control system controls the circulation pipeline and the fourth liquid tank to form a circulation loop, and the third target temperature is higher than or equal to the second target temperature; In response to the completion of the test of the product to be calibrated in the low-temperature test environment, the control system transports the liquid in the first liquid tank to the circulation pipeline, and pushes the liquid originally existing in the circulation pipeline to the third liquid tank and / or the fourth liquid tank for cooling and standby; In response to the liquid in the circulation pipeline being switched to the liquid in the first liquid tank, the control system controls the circulation pipeline and the first liquid tank to form a circulation loop; In response to the inner cavity temperature approaching a fourth target temperature, the control system controls the circulation pipe and the second liquid tank to form a circulation loop, and the fourth target temperature is lower than or equal to the first target temperature.

10. The calibration system according to claim 9, characterized in that In response to the inner cavity temperature approaching the third target temperature, the control system further controls the humidification device to increase the inner cavity humidity to the first target humidity, wherein the first target humidity is used to characterize the humidity in the low temperature and high humidity test environment; In response to the completion of the test of the product to be calibrated in the low-temperature and high-humidity environment, the control system further controls the dehumidification device to reduce the humidity of the inner cavity to a second target humidity, where the second target humidity is used to characterize the humidity in the low-temperature and low-humidity test environment; In response to the product to be calibrated having completed testing in the high temperature and low humidity test environment, the control system further controls the humidifying device to increase the humidity of the inner cavity to a third target humidity, where the third target humidity is used to characterize the humidity in the high temperature and high humidity test environment.

11. The calibration system according to claim 9, characterized in that In the process of conveying the liquid in the third liquid tank to the circulation pipeline, the control system also controls the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange circuit with the third liquid tank; In the process of transporting the liquid in the first liquid tank to the circulation pipeline, the control system also controls the external cavity heat exchanger and / or the internal cavity heat exchanger to form a heat exchange circuit with the first liquid tank.

12. The calibration system according to claim 9, characterized in that The calibration system further comprises: A bus, a first inflow pipe and a first outflow pipe connected to the bus, a multistage centrifugal pump connected to the first inflow pipe and the first outflow pipe respectively, a four-in-one converter connected to the multistage centrifugal pump, and a second inflow pipe and a second outflow pipe corresponding to different liquid tanks connected to the four-in-one converter, the four-in-one converter is used to control the switching state of the second inflow pipe and the second outflow pipe.

13. The calibration system according to claim 12, characterized in that The control system controls the speed of the multi-stage centrifugal pump through a frequency converter; and / or The control system refrigerates and controls the temperature of the liquid in the third liquid tank and / or the fourth liquid tank through a refrigeration control device connected to the first refrigeration device and / or the second refrigeration device; and / or The control system heats and controls the temperature of the liquid in the first liquid tank and / or the second liquid tank through a temperature controller connected to the first heating device and / or the second heating device; and / or The control system controls the working state of the humidifying device and / or the dehumidifying device through a humidity controller to control the humidity of the air in the inner cavity; and / or The control system switches the liquid tank in the circulation loop formed by the circulation pipeline and the liquid tank in the heat exchange loop formed by the external cavity heat exchanger and / or the internal cavity heat exchanger through the electric valve controller.

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