Constant temperature liquid tank and temperature control method thereof

Abstract

An embodiment of the present application provides a constant temperature liquid tank and a temperature control method thereof, comprising: a tank body having a first side wall and a second side wall opposite to each other; a guide baffle arranged in a tank cavity of the tank body, a stirring zone arranged between the guide baffle and the first side wall, a working zone arranged between the guide baffle and the second side wall, the working zone being used to place an instrument to be measured, and a guide hole being arranged on the guide baffle; a temperature control component consisting of a first temperature control module and a second temperature control module, the first temperature control module being arranged in the stirring zone, the first temperature control module being used to heat or cool the liquid medium in the stirring zone, the second temperature control module being arranged on the outside of the tank body and located on the first side wall, the second temperature control module being used to heat or cool the first side wall; a stirring impeller being arranged in the stirring zone, the stirring impeller rotating in a direction so that the liquid medium in the stirring zone exchanges heat with the first temperature control module and the first side wall and mixes in the stirring zone, and flows to the working zone through the guide hole.

Description

Technical Field

[0001] The present application relates to the field of temperature calibration technology, and in particular to a constant temperature liquid bath and a temperature control method thereof. Background Art

[0002] The constant temperature liquid tank is used to detect the temperature sensor to be tested. It includes a tank body and a temperature control module. A tank cavity for accommodating a liquid medium is formed on the inside of the tank body. During the detection process, the liquid medium is injected into the tank cavity. The temperature control module heats or cools the liquid medium in the tank cavity to make the liquid medium reach the target temperature. The instrument to be tested is placed in the liquid medium in the tank cavity, so that the instrument to be tested can be tested.

[0003] In a related technology, in order to ensure that the liquid medium in the tank cavity is heated evenly, the temperature control module is symmetrically arranged on the outer wall of the tank body, and the stirring impeller drives the liquid medium to circulate between the inner wall of the tank cavity and the middle of the tank cavity. In this technology, due to the temperature difference between the temperature control module and the liquid medium in the tank cavity, there is a gradient change in the temperature field from the inner wall of the tank cavity to the middle of the tank cavity, which affects the uniformity of the temperature field and reduces the efficiency of temperature detection. Summary of the Invention

[0004] The embodiments of the present application provide a constant temperature liquid tank and a temperature control method thereof, which can improve the temperature uniformity of the liquid medium in the tank cavity.

[0005] A first aspect of an embodiment of the present application provides a constant temperature liquid tank, comprising:

[0006] The tank body is used to contain the liquid medium, and includes a first side wall and a second side wall opposite to each other, and a tank cavity is formed between the first side wall and the second side wall;

[0007] A guide baffle is provided in the tank cavity, a stirring zone is provided between the guide baffle and the first side wall, a working zone is provided between the guide baffle and the second side wall, the working zone is used to place the instrument to be tested, and a guide hole is provided on the guide baffle;

[0008] The temperature control assembly is composed of a first temperature control module and a second temperature control module. The first temperature control module is arranged in the stirring zone and is used to heat or cool the liquid medium in the stirring zone. The second temperature control module is arranged outside the tank body and is located on the first side wall. The second temperature control module is used to heat or cool the first side wall.

[0009] The stirring impeller is arranged in the stirring zone. The stirring impeller rotates in a directional manner so that the liquid medium in the stirring zone exchanges heat with the first temperature control module and the first side wall, and mixes in the stirring zone and flows to the working zone through the guide hole.

[0010] The present invention provides a constant temperature liquid tank, wherein a guide baffle is provided within the tank body, a working area is provided between the guide baffle and the second side wall, so that an instrument to be tested can be placed in the working area, a stirring area is provided between the guide baffle and the first side wall, a stirring impeller is provided in the stirring area, a first temperature control module is provided within the stirring area, the first temperature control module is used to perform heat exchange with a liquid medium in the stirring area, and a second temperature control module is provided on the outer surface of the first side wall, the second temperature control module is used to perform heat exchange with the first side wall. The structural positions of the guide baffle, the first side wall, the first temperature control module, the second temperature control module, and the stirring impeller cooperate with each other, so that the liquid medium in the stirring area can perform heat exchange with the first temperature control module and the first side wall, and at the same time, mixed flow can be generated within the stirring area and can flow to the working area through the guide holes on the guide baffle. Compared with the related art in which the temperature control modules are symmetrically arranged on the outer wall of the tank body, the present invention can reduce the temperature gradient of the liquid medium in the working area, improve the uniformity of the temperature field of the liquid medium in the working area, and thereby improve the temperature calibration efficiency of the instrument to be calibrated.

[0011] In some implementations, the tank body further includes a third sidewall connected between the first sidewall and the second sidewall, a fourth sidewall disposed opposite to the third sidewall, and a bottom wall, wherein the first sidewall, the second sidewall, the third sidewall, the fourth sidewall, and the bottom wall enclose a tank cavity;

[0012] The bottom wall includes a first portion and a second portion connected to each other, the first portion is connected to the first side wall, the second portion is connected to the second side wall, an obtuse angle is formed between the inner side surface of the first portion and the inner side surface of the first side wall, and an obtuse angle is formed between the inner side surface of the first portion and the inner side surface of the second portion;

[0013] In an embodiment of the present application, when the liquid medium in the stirring zone reaches the first part of the bottom wall under the downward push of the stirring impeller, it can be at least partially converted to flow in a horizontal direction toward the working area due to the structure of the first part of the bottom wall, thereby improving the uniformity of the temperature field in the lower part and bottom of the working area.

[0014] In some embodiments, at least part of the first part is located between the guide baffle and the first side wall, and the upper edge of the first part is higher than the lower edge of the guide baffle; the stirring impeller is located above the first part, and the distance between the stirring impeller and the first part is greater than the distance between the upper edge of the guide baffle and the stirring impeller; the guide holes are spaced apart on the guide baffle along the up and down directions.

[0015] In an embodiment of the present application, since the distance between the stirring impeller and the first part is greater than the distance between the upper edge of the guide baffle and the stirring impeller, the stirring impeller is located in the middle or upper part of the stirring zone, so that the liquid medium in the middle or upper part of the stirring zone is driven by the stirring impeller to flow to the working zone, thereby improving the temperature field uniformity in the middle of the working zone. Combined with the up and down distribution of the guide holes, the liquid medium in the area below the stirring impeller can also flow from the stirring zone to the working zone. The closer to the bottom wall, the smaller the flow trend generated by the stirring impeller, thereby improving the temperature field uniformity in the middle and lower parts of the working zone. When reaching the first part of the bottom wall, the liquid medium flows from the stirring zone to the working zone through the structure of the first part of the bottom wall, thereby compensating for the trend of the liquid medium in the area where the first part of the bottom wall is located.

[0016] Can be improved.

[0017] In some implementations, both ends of the guide baffle converge toward the first side wall, and the distance between one end of the guide baffle and the first side wall is smaller than the distance between the middle of the guide baffle and the first side wall.

[0018] The embodiment of the present application can reduce the spatial size of the stirring zone formed between the guide baffle and the first side wall through the structural design of the guide baffle. When the power of the stirring impeller remains unchanged, the mixing efficiency of the liquid medium in the stirring zone can be improved, and the temperature uniformity of the liquid medium can be improved.

[0019] In some implementations, the guide baffle includes a first guide baffle, a second guide baffle, and a third guide baffle. One end of the first guide baffle is connected to the second guide baffle, and the other end of the first guide baffle is connected to the third guide baffle. An obtuse angle is formed between the first guide baffle and the second guide baffle, with the opening facing the stirring zone. An obtuse angle is formed between the first guide baffle and the third guide baffle, with the opening facing the stirring zone.

[0020] The embodiment of the present application can reduce the spatial size of the stirring zone through the structural design of the guide baffle, improve the barrier effect on the liquid medium, and thus improve the mixing efficiency of the liquid medium in the stirring zone.

[0021] In some implementations, a first guide hole is provided on the first guide plate, so that the liquid medium in the stirring zone flows to the working zone through the first guide hole close to the second guide plate, and the liquid medium in the working zone flows to the stirring zone through the first guide hole close to the third guide plate; the second guide plate is a non-porous plate, so that the liquid medium in the stirring zone is blocked by the second guide plate when flowing to the working zone; a guide gap is provided between the second guide plate and the first side wall, so that the liquid medium in the stirring zone flows to the working zone through the guide gap; a third guide hole is provided on the third guide plate, so that the liquid medium in the working zone flows to the stirring zone through the third guide hole.

[0022] In the embodiment of the present application, when the liquid medium is driven by the stirring impeller to generate a flow trend from the stirring zone to the working zone, it will be blocked by the second guide partition plate, thereby flowing in the direction of the first guide partition plate and the guide gap respectively. The longer flow path can improve the mixing effect. A portion of the liquid medium flows from the stirring zone to the working zone through the first guide hole near the second guide partition plate, and the liquid medium in the working zone flows to the stirring zone through the first guide hole near the third guide partition plate, thereby achieving a small-scale circulation of the liquid medium near the first guide partition plate. Another portion of the liquid medium flows from the stirring zone to the working zone through the guide gap, and the liquid medium in the working zone flows to the stirring zone through the third guide hole, thereby achieving a large-scale circulation of the liquid medium throughout the tank cavity. Due to the structural difference between the first guide partition plate and the guide gap, less liquid medium participates in the small-scale circulation at a slower flow rate, and more liquid medium participates in the large-scale circulation at a faster flow rate, thereby improving the temperature field uniformity of the entire working zone.

[0023] In some implementations, the constant temperature liquid tank further includes a temperature measuring element, which is used to measure the temperature of the liquid medium. The temperature measuring element is connected to the first guide plate, or the temperature measuring element is connected to the third guide plate.

[0024] In an embodiment of the present application, if the temperature measuring element is arranged on the first guide plate, since the liquid medium flowing through the first guide plate participates in the aforementioned small-scale circulation, the measurement result of the temperature measuring element can quickly respond to the temperature change of the working area caused by the adjustment of the temperature control component. If the temperature measuring element is arranged on the third guide plate, since the liquid medium flowing through the third guide plate participates in the aforementioned large-scale circulation, the measurement result of the temperature measuring element can more representatively reflect the temperature of the entire working area.

[0025] In some implementations, the constant temperature liquid tank also includes a guide fixing portion arranged above the tank body, which is connected to the guide baffle through a guide fixing column. The radial cross-sectional area of ​​the guide fixing column is smaller than the radial cross-sectional area of ​​the guide baffle, and the guide baffle does not contact the inner side of the tank body.

[0026] In the embodiment of the present application, on the one hand, since the guide baffle is not in contact with the inner side of the trough body, the heat transfer between the working area and the side wall of the trough body through the guide baffle is reduced. On the other hand, through the design of the guide fixing column, the heat transfer efficiency of the guide baffle to the top of the trough body can be reduced, thereby reducing the heat transfer effect of the guide baffle on the liquid medium in the working area, thereby improving the uniformity of the temperature field in the working area.

[0027] In some implementations, the second temperature control module includes a temperature equalizing plate, which is bonded to the first side wall; the second temperature control module also includes at least one of a refrigeration cavity and a heating body; the refrigeration cavity is arranged in the temperature equalizing plate, and the refrigeration cavity is connected to the refrigeration compressor so that the refrigerant circulates between the refrigeration cavity and the refrigeration compressor; the heating body is arranged in the temperature equalizing plate, or the heating body is bonded to the temperature equalizing plate.

[0028] In an embodiment of the present application, at least one of the second heating body and the refrigeration cavity is arranged on the first side wall through a temperature equalizing plate, which can increase the contact area between the heating body or the refrigeration cavity and the first side wall, and improve the heat transfer efficiency between the heating body or the refrigeration cavity and the first side wall; further, when the refrigeration cavity is connected to the refrigeration compressor, the arrangement of the temperature equalizing plate can increase the heat capacity of the second temperature control module. When the cooling capacity of the refrigeration compressor fluctuates, the fluctuating cooling capacity is absorbed by the temperature equalizing plate, reducing the temperature fluctuation caused by the fluctuation of the cooling capacity, improving the temperature control stability of the second temperature control module, and thus improving the control accuracy of the second temperature control module.

[0029] In some implementations, a distance between the refrigeration cavity and the first side wall is smaller than a distance between the heating body and the first side wall.

[0030] In an embodiment of the present application, when the second temperature control module is used for cooling, the heating body can be used to compensate for the fluctuations in the cooling capacity generated by the refrigeration compressor. Since the distance between the heating body and the first side wall is greater than the distance between the refrigeration cavity and the first side wall, the compensatory heating amount of the heating body can be absorbed by the temperature equalizing plate and the refrigeration cavity, thereby improving the temperature control stability of the first side wall by the second temperature control module.

[0031] In some implementations, the constant temperature liquid tank further includes an insulation layer, which wraps the second temperature control module and the outer side of the tank body.

[0032] In the embodiment of the present application, by providing a thermal insulation layer, the heat exchange between the tank body and the surrounding environment can be reduced, and the uniformity of the temperature field in the tank cavity can be improved.

[0033] In some implementations, the second temperature control module includes a refrigeration cavity, which is connected to a refrigeration compressor, so that the refrigerant circulates between the refrigeration cavity and the refrigeration compressor, and the insulation layer is attached to the second temperature control module and the outer side of the tank body.

[0034] In the embodiment of the present application, the liquid medium in the tank cavity can be cooled by a refrigeration compressor, and the insulation layer is fitted with the second temperature control module and the outer side of the tank body. Compared with setting a cooling air duct around the tank body, the heat transfer effect of heat exchange means such as heat convection in the cooling air duct on the liquid medium in the tank is reduced, and the uniformity of the temperature field in the tank cavity is improved.

[0035] In some implementations, the second temperature control module includes a heating body, the insulation layer is attached to the second side wall, a heat dissipation duct is formed between the bottom wall of the constant temperature liquid tank and the insulation layer, and the outlet of the heat dissipation duct is switchably arranged on the surface of the constant temperature liquid tank.

[0036] In an embodiment of the present application, the heat dissipation duct is arranged at the bottom of the trough body, and the insulation layer is attached to the second side wall. Compared with setting the heat dissipation duct on the side wall of the trough body, the heat leakage around the middle and upper parts of the trough body can be reduced, and the uniformity of the temperature field in the trough cavity is improved.

[0037] In some implementations, the distance between the first temperature control module and the first side wall is smaller than the distance between the stirring impeller and the first side wall; and there is a gap between the first temperature control module and the first side wall.

[0038] In the embodiment of the present application, through the position design of the first temperature control module, the liquid medium controlled by the first temperature control module can be driven to circulate more by the stirring impeller, thereby achieving sufficient mixing in the stirring zone, and the liquid medium with uniform temperature after mixing flows to the working zone through the guide hole, thereby improving the temperature field uniformity of the working zone.

[0039] In some implementations, the constant temperature liquid tank includes a liquid storage tank and a drain pipe, wherein the liquid storage tank is disposed outside the shell of the constant temperature liquid tank; one end of the drain pipe is connected to the liquid storage tank, and the other end of the drain pipe is connected to the upper part of the tank cavity.

[0040] In the embodiment of the present application, through the design of the liquid storage cavity and the drain pipe, when the liquid medium expands due to heat, if it is higher than the position of the drain pipe, it can be discharged from the drain pipe to the liquid storage tank, reducing the risk of overflow from the slot when the liquid medium in the slot cavity is overfilled.

[0041] In some implementations, the rated power of the first temperature control module is less than the rated power of the second temperature control module.

[0042] In the embodiment of the present application, by distributing the power of the temperature control component, the overall temperature control efficiency of the temperature control component on the liquid medium in the tank cavity can be improved. Moreover, since the second temperature control module is arranged outside the tank body, the risk of overheating or overcooling of the liquid medium can also be alleviated.

[0043] A second aspect of an embodiment of the present application provides a temperature control method for a constant temperature liquid tank, wherein the constant temperature liquid tank includes a tank body, a guide baffle, a temperature control component, and a stirring impeller, the tank body includes a first side wall and a second side wall opposite to each other, a tank cavity is formed between the first side wall and the second side wall, the guide baffle is arranged in the tank cavity, a stirring zone is arranged between the guide baffle and the first side wall, a working zone is arranged between the guide baffle and the second side wall, the working zone is used to place an instrument to be measured, a guide hole is arranged on the guide baffle, the temperature control component is composed of a first temperature control module and a second temperature control module, the first temperature control module is arranged in the stirring zone, the second temperature control module is arranged outside the tank body and located on the first side wall, and the stirring impeller is arranged in the stirring zone; the temperature control method includes:

[0044] Obtaining a target power range of the first temperature control module;

[0045] Obtain the target temperature and the current temperature of the liquid medium in the tank cavity;

[0046] Controlling the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity;

[0047] The output power of the second temperature control module is controlled according to the output power of the first temperature control module and the target power range.

[0048] The constant temperature liquid tank in the second aspect of the embodiment of the present application may be the constant temperature liquid tank in the first aspect of the embodiment of the present application and any example thereof.

[0049] In an embodiment of the present application, a first temperature control module is arranged in the stirring zone, and the output power of the first temperature control module is controlled according to the target temperature and the current temperature of the liquid medium in the tank cavity. The fluctuation or deviation between the target temperature and the current temperature of the liquid medium in the tank cavity can be quickly compensated, and the total demand or total trend of the current working condition for the output power of the temperature control component can be judged by the output power of the first temperature control module. The second temperature control module is arranged on the outside of the tank body, and the output power of the second temperature control module is controlled according to the output power of the first temperature control module and the target power range. It can reduce the interference caused by the fluctuation of the liquid medium in the tank cavity, and thus reduce the over-adjustment degree of the second temperature control module, and can adjust the second temperature control module according to the current working condition, thereby meeting the total demand of the current working condition for the output power of the temperature control component, thereby improving the temperature field uniformity of the constant temperature liquid tank.

[0050] In some implementations, controlling the output power of the second temperature control module according to the output power of the first temperature control module and the target power range includes:

[0051] If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, the module expected temperature of the second temperature control module is adjusted according to the output power and the target power range of the first temperature control module; wherein, if the module expected temperature is lower than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the module expected temperature is lowered, and when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the module expected temperature is increased; if the module expected temperature is higher than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the module expected temperature is increased, and when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the module expected temperature is lowered;

[0052] The current temperature of the second temperature control module is obtained, and the output power of the second temperature control module is controlled according to the module desired temperature and the current temperature of the second temperature control module so that the current temperature of the second temperature control module reaches the module desired temperature.

[0053] In the embodiment of the present application, the second temperature control module is located on the first side wall. The temperature difference between the second temperature control module and the liquid medium in the tank cavity affects the heat transfer efficiency between the second temperature control module and the liquid medium in the tank cavity. When the current temperature of the liquid medium in the tank cavity reaches the target temperature, the total demand or total trend of the output power of the temperature control component under the current working conditions is judged by the output power of the first temperature control module. If the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, it indicates that the second temperature control module is required to provide more heating or cooling capacity. If the output power of the first temperature control module is less than or equal to the lower limit of the target power range, it indicates that the second temperature control module is required to reduce the heating capacity. Or the supply of cooling capacity, accordingly adjust the module's expected temperature, and adjust the output power of the second temperature control module to make the second temperature control module reach the module's expected temperature, and then adjust the heating capacity or cooling capacity of the second temperature control module according to actual needs; in addition, if the module's expected temperature is lower than the target temperature, it can be judged that the constant temperature liquid tank is in the cooling process, and the adjustment target can be determined to be the cooling capacity of the second temperature control module. If the module's expected temperature is higher than the target temperature, it can be judged that the constant temperature liquid tank is in the heating process, and the adjustment target can be determined to be the heating capacity of the second temperature control module. The module's expected temperature is adjusted according to the difference between the cooling capacity and the heating capacity, which can adapt to the temperature control requirements of different scenarios.

[0054] In some implementations, the temperature control method further includes:

[0055] According to the current temperature and target temperature of the liquid medium in the tank cavity, the desired temperature of the second temperature control module is adjusted; wherein, T R2 =T T +K(T T -T1)+b;T R2 is the expected module temperature, TT is the target temperature, T1 is the current temperature of the liquid medium in the tank cavity, K is the first compensation parameter, b is the second compensation parameter, if the target temperature is higher than the ambient temperature, then K>0, b>0, if the target temperature is lower than the ambient temperature, then K<0, b<0;

[0056] The current temperature of the second temperature control module is obtained, and the output power of the second temperature control module is controlled according to the module desired temperature and the current temperature of the second temperature control module so that the current temperature of the second temperature control module reaches the module desired temperature.

[0057] The present application embodiment is based on T R2 =T T +K(T T -T1)+b is used to adjust the module expected temperature of the second temperature control module. When K and b are determined, the second temperature control module and the medium temperature in the tank cavity are on both sides of the target temperature. When the temperature of the medium in the tank cavity is greatly different from the target temperature, the difference between the module expected temperature and the target temperature is also greatly. The heat exchange rate between the liquid medium in the tank cavity and the first side wall is high, which can make the liquid medium in the tank cavity change to the target temperature at a faster rate, thereby reducing the time for the constant temperature liquid tank to reach the target temperature and improving the temperature detection efficiency. When the temperature of the medium in the tank cavity is small compared with the target temperature, the difference between the module expected temperature and the target temperature is also small. The heat exchange rate between the liquid medium in the tank cavity and the first side wall is low, which can make the liquid medium in the tank cavity change to the target temperature at a slower rate, thereby reducing the risk of temperature overshoot of the constant temperature liquid tank, reducing temperature fluctuations caused by overshoot, and improving the temperature field stability and temperature detection efficiency of the constant temperature liquid tank.

[0058] In some implementations,

[0059] If the expected temperature of the module is higher than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the second compensation parameter b is increased; when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the second compensation parameter b is decreased; if the expected temperature of the module is lower than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the second compensation parameter b is decreased; when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the second compensation parameter b is increased.

[0060] An embodiment of the present application provides a method for further adjusting the temperature difference between the second temperature control module and the target temperature. The heating rate can be increased by increasing the second compensation parameter b during continuous heating, and the cooling rate can be increased by reducing the second compensation parameter b during continuous cooling, thereby shortening the time it takes for the liquid medium in the tank to reach the target temperature and improving the temperature detection efficiency.

[0061] In some implementations,

[0062] When the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature is greater than the temperature difference threshold, the first compensation parameter K=k1 is determined; when the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature is less than or equal to the temperature difference threshold, the first compensation parameter K=k2 is determined, |k1|>|k2|.

[0063] In the embodiment of the present application, when |T T When -T1| is large, increasing K can increase the temperature difference between the module's desired temperature and the liquid medium in the tank cavity, thereby increasing the amount of heating or cooling provided by the second temperature control module to the liquid medium in the tank cavity, causing it to change to the target temperature more quickly, thereby improving temperature detection efficiency. T When -T1| is small, K can be reduced to reduce the temperature difference between the desired module temperature and the liquid medium in the tank cavity, thereby reducing the amount of heating or cooling provided by the second temperature control module to the liquid medium in the tank cavity, so that it approaches the target temperature at a slower rate, reducing the risk of temperature overshoot of the constant temperature liquid tank, and improving the temperature field stability and temperature detection efficiency of the constant temperature liquid tank.

[0064] In some implementations, the second temperature control module includes a heating body and a refrigeration cavity, and the refrigeration cavity is connected to a refrigeration compressor, so that the refrigerant circulates between the refrigeration cavity and the refrigeration compressor;

[0065] Controlling the output power of the second temperature control module includes: periodically controlling the output power of the heating body, the control period of the heating body is less than the control period of the second temperature control module, and periodically controlling the output power of the refrigeration compressor, the control period of the refrigeration compressor is greater than the control period of the second temperature control module.

[0066] In an embodiment of the present application, the control period of the heating body is smaller than the control period of the second temperature control module, and the control period of the second temperature control module is smaller than the control period of the refrigeration compressor. Since the power fluctuation of the heating body is smaller, the second temperature control module can be made closer to the desired module temperature within its control period by adjusting the heating body at a higher frequency. Since the power fluctuation of the refrigeration compressor is larger, the control interference to the second temperature control module caused by the power fluctuation of the refrigeration compressor can be reduced by adjusting the refrigeration compressor at a lower frequency.

[0067] In some implementations,

[0068] The constant temperature liquid tank further includes a first temperature measuring element disposed in the tank cavity; obtaining the target temperature and the current temperature of the liquid medium in the tank cavity includes obtaining measurement information from the first temperature measuring element and determining the current temperature of the liquid medium in the tank cavity based on the measurement information of the first temperature measuring element;

[0069] The constant temperature liquid tank also includes a second temperature measuring element, which is connected to the second temperature control module; the temperature control method also includes obtaining measurement information from the second temperature measuring element and determining the current temperature of the second temperature control module based on the measurement information of the second temperature measuring element.

[0070] In some implementations, the output power of the first temperature control module is periodically controlled, and the output power of the second temperature control module is periodically controlled; the control period of the first temperature control module is shorter than the control period of the second temperature control module.

[0071] In an embodiment of the present application, when the temperature of the constant temperature liquid tank fluctuates, if the change is a temporary temperature fluctuation, the factors causing the change are quickly eliminated, and the thermal equilibrium relationship inside and outside the tank cavity is quickly restored to its original state. The first temperature control module is located in the stirring zone, and the first temperature control module can respond to temporary temperature fluctuations more quickly. Since the control cycle of the first temperature control module is smaller than the control cycle of the second temperature control module, the first temperature control module will restore the target power range after compensating for the temporary temperature fluctuation, reducing the control impact of the temporary temperature fluctuation on the second temperature control module, and improving the temperature stability of the constant temperature liquid tank.

[0072] The output power of the first temperature control module is lower than the output power of the second temperature control module. This improves the temperature control efficiency of the liquid medium in the tank cavity by a temperature control component, such as the second temperature control module, thereby reducing the power consumption of the first temperature control module and the probability of exceeding the target power range. Furthermore, when the output power of the second temperature control module is higher, the presence of the first sidewall mitigates the risk of overheating or overcooling of the liquid medium.

[0073] In some implementations, controlling the output power of the first temperature control module based on the target temperature and the current temperature of the liquid medium in the tank cavity includes: if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, reducing the heating power of the first temperature control module, or controlling the first temperature control module to reach a minimum heating power, or increasing the cooling power of the first temperature control module, or controlling the first temperature control module to reach a maximum cooling power;

[0074] If the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the heating power of the first temperature control module is increased, or the first temperature control module is controlled to reach the maximum heating power, or the cooling power of the first temperature control module is reduced, or the first temperature control module is controlled to reach the minimum cooling power;

[0075] If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, the current output power of the first temperature control module is kept unchanged.

[0076] Because the first temperature control module is arranged inside the tank cavity, the first temperature control module can quickly respond to the temperature of the liquid medium in the tank cavity. The temperature of the liquid medium in the tank cavity can be controlled by the first temperature control module so that the current temperature of the liquid medium in the tank cavity can quickly reach the target temperature, thereby improving the temperature control efficiency of the constant temperature liquid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0077] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0078] Figure 1 This is a schematic diagram of the overall structure of a constant temperature liquid tank provided in one embodiment of the present application;

[0079] Figure 2 This is a longitudinal cross-sectional view of a constant temperature liquid tank provided in one embodiment of the present application. Figure 1 ;

[0080] Figure 3 This is a cross-sectional view of the assembly of the tank body and the stirring mechanism provided in one embodiment of the present application;

[0081] Figure 4 This is a longitudinal cross-sectional view of a constant temperature liquid tank provided in one embodiment of the present application. Figure 2 ;

[0082] Figure 5 is a transverse cross-sectional view of another constant temperature liquid tank provided in one embodiment of the present application;

[0083] Figure 6 It is a structural schematic diagram of a guide baffle provided in one embodiment of the present application.

[0084] Description of reference numerals:

[0085] 10-housing; 20-tank body; 30-temperature control assembly; 40-flow guide baffle; 50-stirring mechanism; 60-tank cover; 70-insulation layer; 80-cooling system; 90-display module; 100-liquid storage tank; 200-drain pipe;

[0086] 11-first housing; 12-second housing; 13-third housing; 14-bottom housing; 21-first side wall; 22-second side wall; 23-bottom wall; 24-slot; 25-slot; 31-first temperature control module; 32-second temperature control module; 33-refrigeration compressor; 34-first temperature measuring element; 35-second temperature measuring element; 41-first flow guide plate; 42-second flow guide plate; 43-third flow guide plate; 44-flow guide hole; 45-flow guide fixing column; 51-stirring impeller; 52-driving rod; 53-stirring motor; 54-stirring mounting portion; 55-third fan; 56-fourth vent; 81-heat dissipation duct; 82-first fan; 83-second fan; 84-first vent; 85-second vent; 86-third vent

[0087] 231 - first part; 232 - second part; 241 - stirring area; 242 - working area; 321 - refrigeration chamber; 322 - second heating body; 323 - temperature averaging plate; 411 - first guide hole; 431 - third guide hole. DETAILED DESCRIPTION

[0088] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0089] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific implementation methods disclosed below.

[0090] In the description of this application, it should be understood that the terms "upper," "lower," "horizontal," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium.

[0091] In this application, unless otherwise expressly specified or limited, the terms "connected," "connected," "fixed," and the like should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two elements or an interaction between two elements. However, the phrase "directly connected" indicates that the two connected entities are not connected through an intermediate structure, but are connected to form a whole through a connecting structure. Those skilled in the art can understand the specific meanings of the above terms in this application based on the specific circumstances.

[0092] In this application, references to "first," "second," and the like are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one of these features.

[0093] Figure 1 This is a schematic diagram of the overall structure of a constant temperature liquid tank provided in one embodiment of the present application. Figure 2 This is a longitudinal cross-sectional view of a constant temperature liquid tank provided in one embodiment of the present application. Figure 1 , Figure 3 This is a cross-sectional view of the assembly of the tank body and the stirring mechanism provided in one embodiment of the present application. Figure 4 This is a longitudinal cross-sectional view of a constant temperature liquid tank provided in one embodiment of the present application. Figure 2 , Figure 5 This is a transverse cross-sectional view of another constant temperature liquid tank provided in one embodiment of the present application. Figure 6 This is a schematic diagram of the structure of the guide baffle provided in one embodiment of the present application. Figures 1 to 6 As shown, the embodiment of the present application provides a constant temperature liquid tank, including a tank body 20, the tank body 20 is used to accommodate a liquid medium. Figure 3 As shown, the tank body 20 may include a first side wall 21 and a second side wall 22 opposite to each other. A tank cavity 24 is formed between the first side wall 21 and the second side wall 22 .

[0094] In some examples, the trough body 20 is a box structure with an opening at the top. The liquid medium can be injected into the trough cavity 24 of the trough body 20 through the slot 25. The instrument to be measured extends into the liquid medium in the trough cavity 24 through the top opening of the trough body 20 to perform temperature calibration. During the temperature calibration process, the slot 25 can be in an open state or a closed state.

[0095] In some examples, the groove body 20 may include a third side wall connected between the first side wall 21 and the second side wall 22, a fourth side wall arranged opposite to the third side wall, and a bottom wall 23. The first side wall 21, the second side wall 22, the third side wall, the fourth side wall and the bottom wall 23 enclose a groove cavity 24 of the groove body 20; it can be understood that due to the arrangement of the third side wall, the fourth side wall and the bottom wall 23, there is no contact between the first side wall 21 and the second side wall 22.

[0096] It should be noted that the entire wall of the trough body 20 may be in an arc structure, a rectangular parallelepiped, a cube or an irregular polyhedron structure. For example, the trough body 20 formed by the first side wall 21, the second side wall 22, the third side wall, the fourth side wall and the bottom wall 23 is a rectangular parallelepiped structure with five faces (see FIG. Figures 1 to 3 As shown), for example, the trough body 20 formed by the first side wall 21, the second side wall 22, the third side wall, the fourth side wall and the bottom wall 23 is a cylindrical structure with an opening at the top. The embodiment of the present application does not limit the shape of the trough body 20.

[0097] In some examples, the constant temperature liquid tank may include a shell 10 having an installation cavity, and the tank body 20 may be disposed in the installation cavity of the shell 10 .

[0098] Reference Figure 3 As shown, in some examples, the constant temperature liquid tank further includes a flow guide baffle 40 disposed within the tank cavity 24 of the tank body 20. A stirring zone 241 is disposed between the flow guide baffle 40 and the first sidewall 21, and a working zone 242 is disposed between the flow guide baffle 40 and the second sidewall 22. The working zone 242 is used to house instruments to be tested, which extend into the liquid medium in the working zone 242 for temperature calibration. Furthermore, a flow guide hole 44 is provided on the flow guide baffle 40 to connect the working zone 242 with the stirring zone 241.

[0099] Since the stirring zone 241 is arranged between the guide baffle 40 and the first side wall 21, the working zone 242 is arranged between the guide baffle 40 and the second side wall 22, and the first side wall 21 and the second side wall 22 are arranged opposite to each other, the first side wall 21 is only located on the side of the guide baffle 40 facing the stirring zone 241, and has no contact with the working zone 242.

[0100] In some examples, the trough cavity 24 of the trough body 20 can be divided into a working area 242 and a stirring area 241 by the guide baffle 40. For example, the stirring area 241 is formed between the guide baffle 40 and the first side wall 21, and the working area 242 is formed between the guide baffle 40 and the second side wall 22.

[0101] In some examples, components, such as a stirring impeller, may be disposed between the guide baffle 40 and the first sidewall 21. In some examples, other components, such as a net bag for holding instruments under test, may be disposed between the guide baffle 40 and the second sidewall 22. The first sidewall 21 and the second sidewall 22 are opposing sidewalls of the same tank body, and the working area and stirring area are interconnected sections within the same tank cavity 24.

[0102] Reference Figures 2 to 5 As shown, in some examples, the constant temperature liquid tank also includes a temperature control component 30, which is composed of a first temperature control module 31 and a second temperature control module 32, wherein the first temperature control module 31 is arranged in the stirring area 241, and the first temperature control module 31 is used to heat or cool the liquid medium in the stirring area 241.

[0103] The first temperature control module 31 may include a first heating body. If so, the first temperature control module 31 can heat the liquid medium in the stirring zone 241 . The first temperature control module 31 may include a first cooling body. If so, the first temperature control module 31 can cool the liquid medium in the stirring zone 241 .

[0104] There may be one or more first temperature control modules 31 . If there are more than one first temperature control modules 31 , each first temperature control module 31 is disposed in the stirring zone 241 .

[0105] By setting the first temperature control module 31 in the tank cavity 24, compared with setting it outside the tank cavity 24, the first temperature control module 31 is in contact with the liquid medium in the stirring zone 241, and can directly exchange heat with the liquid medium, thereby quickly responding to temperature fluctuations of the liquid medium in the tank cavity 24 and improving the temperature control efficiency of the liquid medium.

[0106] In some examples, the first temperature control module 31 may include a heater. It should be noted that, in order to distinguish it from the heater mentioned in the second temperature control module 32 below, the heater here may be referred to as a first heater, which is used to provide heat for the liquid medium.

[0107] Among them, the first heating body may include but is not limited to a ceramic heater, an electric heating wire or an electromagnetic heater, etc. The embodiment of the present application does not limit the type of the first heating body; considering that the first heating body is in contact with the liquid medium, an insulating layer may be provided on the outside of the first heating body.

[0108] The second temperature control module 32 of the embodiment of the present application is disposed outside the tank body 20 and located on the first side wall 21 . The second temperature control module 32 is used to heat or cool the first side wall 21 .

[0109] There can be one or more second temperature control modules 32. If there are multiple second temperature control modules 32, each second temperature control module 32 is arranged on the first side wall 21. The second temperature control module 32 does not contact the second side wall 22, nor is it located in the outer space of the trough body 20 corresponding to the second side wall 22. The second temperature control module 32 does not contact the bottom wall 23, nor is it located in the outer space of the trough body 20 corresponding to the third side wall 23. If there are a third side wall and a fourth side wall, the second temperature control module 32 does not contact the third side wall, nor is it located in the outer space of the trough body 20 corresponding to the third side wall. The second temperature control module 32 does not contact the fourth side wall, nor is it located in the outer space of the trough body 20 corresponding to the fourth side wall.

[0110] In some examples, the first sidewall 21 has a certain thickness, and at least a portion of the second temperature control module 32 is disposed within the first sidewall 21. Alternatively, at least a portion of the second temperature control module 32 is integral with the first sidewall 21. In some examples, the second temperature control module 32 may include at least one of a refrigeration cavity 321 and a heating body.

[0111] The refrigeration chamber 321 of the second temperature control module 32 is connected to the refrigeration compressor 33, so that a refrigeration cycle is performed between the refrigeration chamber 321 and the refrigeration compressor 33. For example, a circulation loop is formed between the refrigeration compressor 33 and the refrigeration chamber 321, so that the refrigerant circulates between the refrigeration compressor 33 and the refrigeration chamber 321. The temperature of the refrigerant input to the refrigeration chamber 321 is lower than the temperature of the refrigerant output from the refrigeration chamber 321, thereby cooling the first sidewall 21 through the refrigerant.

[0112] For example, when the second temperature control module 32 includes a refrigeration chamber 321, the constant temperature liquid tank may also include a condenser and an expander (it may also be a throttle, such as a capillary tube, etc.), the output end of the refrigeration chamber 321 is connected to the input end of the refrigeration compressor 33, the output end of the refrigeration compressor 33 is connected to the input end of the condenser, the output end of the condenser is connected to the input end of the expander, and the output end of the expander is connected to the input end of the refrigeration chamber 321.

[0113] During the refrigeration process, the refrigerant exchanges heat with the first side wall 21 in the refrigeration chamber 321, thereby cooling the first side wall 21. After the heat exchange, the refrigerant changes into high-temperature, low-pressure steam. Thereafter, it is compressed and pressurized by the refrigeration compressor 33 and changes into high-pressure steam. Thereafter, it dissipates heat and condenses through the condenser and changes into high-pressure liquid. It is depressurized through the expander and changes into low-temperature, low-pressure liquid. Finally, it enters the refrigeration chamber 321 again for refrigeration, repeating the cycle as above.

[0114] In some examples, the second temperature control module 32 includes a heating element, such as a second heating element 322, which is used to heat the first side wall 21. The second heating element 322 can include, but is not limited to, a ceramic heater, an electric heating wire, or an electromagnetic heater, and the embodiment of the present application does not limit the type of the second heating element 322.

[0115] In some examples, the second temperature control module 32 may include a second heating body 322 and a refrigeration cavity 321 , that is, the temperature of the first side wall 21 is controlled by the second heating body 322 and the refrigeration cavity 321 .

[0116] In a specific implementation, the distance between the refrigeration cavity 321 and the first side wall 21 can be smaller than the distance between the heating body and the first side wall 21. In this way, when the second temperature control module 32 is used for cooling, the heat transfer distance between the refrigeration cavity 321 and the first side wall 21 is reduced, thereby improving the temperature response rate. In addition, when the cooling capacity of the refrigeration compressor fluctuates, the cooling fluctuation of the refrigeration compressor can be compensated by starting and adjusting the second heating body 322. Based on the above structure, the heating compensation of the second heating body 322 will be at least partially absorbed by the refrigeration cavity 321, thereby avoiding the heating adjustment of the second heating body 322 directly affecting the temperature of the first side wall 21. In addition, when the second temperature control module 32 is used for heating, the refrigerant in the refrigeration cavity 321 can serve as a heat capacity, which can reduce the temperature fluctuation of the first side wall 21 caused by the temperature fluctuation of the second heating body 322, improve the temperature stability of the second temperature control module 32, and further improve the temperature stability of the constant temperature liquid tank.

[0117] In some examples, in order to improve the heat transfer efficiency of the second temperature control module 32 to the first side wall 21 , the second temperature control module 32 may include a temperature averaging plate 323 , and the temperature averaging plate 323 is in contact with the first side wall 21 .

[0118] In some examples, when the second temperature control module 32 includes a refrigeration cavity 321 , the refrigeration cavity 321 is disposed in the temperature homogenizing plate 323 .

[0119] When the second temperature control module 32 includes a second heating body 322, the second heating body 322 is arranged in the temperature averaging plate 323, or the second heating body 322 is attached to the temperature averaging plate 323. For example, the second heating body 322 is arranged on the top surface, bottom surface or surface facing away from the first side wall 21 of the temperature averaging plate 323. The embodiment of the present application does not limit the setting position of the second heating body 322 on the temperature averaging plate 323.

[0120] By disposing at least one of the second heating body 322 and the refrigeration cavity 321 on the first side wall 21 through the temperature equalizing plate 323, the contact area between the second heating body 322 or the refrigeration cavity 321 and the first side wall 21 can be increased, thereby improving the heat transfer efficiency between the second heating body 322 or the refrigeration cavity 321 and the first side wall 21.

[0121] Among them, the heat capacity of the temperature equalizing plate 323 is greater than the heat capacity of the second heating body 322. In this way, by utilizing the heat capacity of the temperature equalizing plate 323, the temperature fluctuation of the first side wall 21 of the second temperature control module 32 caused by the temperature fluctuation of the second heating body 322 or the refrigeration cavity 321 can be reduced, thereby improving the temperature stability of the liquid medium in the constant temperature liquid tank.

[0122] For example, the temperature homogenizing plate 323 may be made of metal or other materials with good thermal conductivity. The embodiment of the present application does not limit the material of the temperature homogenizing plate 323 .

[0123] Reference Figures 2 to 5 As shown, the constant temperature liquid tank of the embodiment of the present application may include a stirring mechanism 50, the stirring mechanism 50 has a stirring impeller 51, the stirring impeller 51 is arranged in the stirring zone 241, and the stirring impeller 51 rotates in a directional manner so that the liquid medium in the stirring zone 241 exchanges heat with the first temperature control module 31, and exchanges heat with the first side wall 21, and mixes in the stirring zone 241 and flows to the working zone 242 through the guide hole 44.

[0124] By setting the stirring impeller 51 in the stirring zone 241, the stirring impeller 51 rotates in a directional manner, which can drive the liquid medium in the stirring zone 241 to flow from top to bottom, and at the same time rotate with the rotation direction of the stirring impeller 51, so that it can mix under the obstruction of the guide baffle 40. During the mixing process, the liquid medium can fully exchange heat with the first temperature control module 31, and at the same time, it can fully exchange heat with the first side wall 21, so that the entire liquid medium in the stirring zone 241 can be fully in contact with the first temperature control module 31 and the first side wall 21, and the temperature is more uniform. Driven by the stirring impeller 51, the liquid medium with uniform temperature flows quickly and forcefully to the working zone 242 through the guide hole 44. Compared with the related art of symmetrically setting the temperature control module on the outer wall of the tank body 20, the temperature field uniformity of the liquid medium in the entire working zone 242 can be improved, and the temperature calibration accuracy of the instrument to be calibrated can be improved.

[0125] In addition, by arranging the second temperature control module 32 outside the tank cavity 24 and connecting it to the first side wall 21, the second temperature control module 32 first exchanges heat with the first side wall 21, that is, heats or cools the first side wall 21, and then heats or cools the liquid medium in the tank cavity 24 through the first side wall 21. Compared to arranging the second temperature control module 32 inside the tank cavity 24, on the one hand, the risk of overheating or overcooling the liquid medium near the second temperature control module 32 can be reduced. Accordingly, the second temperature control module 32 can use a greater power to provide heating or cooling capacity, thereby improving temperature control efficiency. On the other hand, the heat transfer distance between the high-power second temperature control module 32 and the working area 242 can be increased, so that the first side wall 21 is used to form the stirring area 241, thereby improving the temperature uniformity of the working area 242.

[0126] Temperature detection is performed using the constant temperature liquid tank of the embodiment of the present application. For example, the tank mouth can be opened first, and a sufficient amount of liquid medium can be injected into the tank cavity 24 so that the liquid medium can cover the measuring end of the instrument to be tested. The instrument to be tested is placed in the liquid medium, and the first temperature control module 31 and the second temperature control module 32 are started, so that the temperature control component provides heating or cooling to the liquid medium in the tank cavity 24, so that the temperature of the liquid medium in the tank cavity 24 reaches the temperature required for detection. After that, the instrument to be tested can be measured, tested, verified or data collected according to the specific detection purpose.

[0127] For example, since the second temperature control module 32 is arranged outside the tank cavity 24, the rated power of the second temperature control module 32 can be greater than the rated power of the first temperature control module 31. For example, the rated power of the second heating body 322 can be greater than the rated power of the first heating body. In this way, while improving the temperature control efficiency of the temperature control component 30, such as the second temperature control module 32, on the liquid medium in the tank cavity 24, it can also alleviate the risk of overheating or overcooling of the liquid medium.

[0128] For example, the rated power of the second temperature control module 32 may be greater than three times that of the first temperature control module 31 .

[0129] In some examples, the space of the stirring zone 241 may be smaller than the space of the working zone 242. The reduced space of the stirring zone 241 can increase the flow rate of the liquid medium in the stirring zone 241. On the one hand, it can achieve rapid mixing of the liquid medium in the stirring zone 241, thereby quickly exchanging heat with the first temperature control module 31 and the first side wall 21, thereby improving the temperature regulation efficiency. On the other hand, it can reduce the risk of overheating or overcooling caused by the liquid medium being in contact with the first temperature control module 31 or the first side wall 21 for too long.

[0130] Reference Figure 5As shown, in some examples, the distance between the first temperature control module 31 and the first side wall 21 is smaller than the distance between the stirring impeller 51 and the first side wall 21, that is, the first temperature control module 31 is closer to the first side wall 21 than the stirring impeller 51. In this way, the liquid medium controlled by the first temperature control module 31 can be driven to circulate more by the stirring impeller 51, thereby achieving sufficient mixing in the stirring area 241, and the liquid medium with uniform temperature after mixing flows to the working area 242 through the guide hole 44, thereby improving the temperature field uniformity of the working area 242, and alleviating the situation that the first temperature control module 31 is close to the guide baffle 40, so that the liquid medium near the guide baffle 40 directly enters the working area 242 after being temperature controlled by the first temperature control module 31 without being stirred by the stirring impeller 51.

[0131] In addition, the first temperature control module 31 is closer to the first side wall 21 than the stirring impeller 51 , which reduces the risk of overheating or overcooling of the liquid medium near the first temperature control module 31 .

[0132] Of course, other examples of the embodiments of the present application do not exclude examples in which the distance between the first temperature control module 31 and the first side wall 21 is greater than the distance between the stirring impeller 51 and the first side wall 21, as long as the liquid medium controlled by the first temperature control module 31 can be driven to circulate by the stirring impeller 51.

[0133] Reference Figure 5 As shown, in some examples, there may be a gap between the first temperature control module 31 and the first side wall 21 to avoid direct contact between the first temperature control module 31 and the first side wall 21, so as to avoid heat exchange between the first temperature control module 31 and the first side wall 21, thereby affecting the temperature control accuracy and efficiency of the first temperature control module 31 and the second temperature control module 32 on the liquid medium in the stirring zone 241, so that the first temperature control module 31 can completely transfer the heat or cooling capacity to the liquid medium, and accordingly, the first side wall 21 can also completely transfer the heat or cooling capacity to the liquid medium, thereby improving the temperature control efficiency and temperature control accuracy of the first temperature control module 31 and the second temperature control module 32 on the liquid medium.

[0134] The embodiment of the present application does not limit the size of the gap between the first temperature control module 31 and the first side wall 21 .

[0135] In some examples, the bottom wall 23 of the trough body 20 may be a horizontal wall perpendicular to the first side wall 21 , and the bottom wall 23 is a structure forming the bottom of the trough body 20 .

[0136] Reference Figure 3As shown, in other examples, the bottom wall 23 of the trough body 20 may include a first part 231 and a second part 232 connected to each other, the first part 231 is connected to the first side wall 21, and the second part 232 is connected to the second side wall 22, an obtuse angle is formed between the inner side surface of the first part 231 and the inner side surface of the first side wall 21, and an obtuse angle is formed between the inner side surface of the first part 231 and the inner side surface of the second part 232. In other words, a part of the bottom wall 23 close to the first side wall 21 is an inclined wall inclined toward the inside of the trough cavity 24, so that the liquid medium in the stirring zone 241 in the area below the stirring impeller 51, that is, the part close to the bottom wall 23, can have a flow component in the horizontal direction under the guidance of the first part 231 of the bottom wall 23, so as to flow rapidly to the working zone 242 in the horizontal direction, thereby improving the temperature field uniformity in the upper and lower directions of the working zone 242.

[0137] Specifically, the liquid medium in the stirring zone 241 rotates from top to bottom under the stirring of the stirring impeller 51 and along the rotation direction of the stirring impeller 51. The liquid medium flows through the guide baffle 40 in the rotation direction. Due to the guide holes and the barrier structure of the guide baffle 40, a part of the liquid medium will pass through the guide holes 44 and enter the working zone 242. A part of the liquid medium will be blocked by the guide baffle 40 and return to the stirring zone 241 to continue mixing and continue to move downward. When the liquid medium reaches the area near the bottom wall 23, the rotation direction component generated by the stirring impeller 51 that causes the liquid medium to flow toward the working zone is reduced. By setting the first part 231 of the bottom wall 23 to have an acute angle with the first side wall 21 and the second part 232, that is, setting the first part 231 of the bottom wall 23 to be an inclined wall, the downward component of the liquid medium below the guide baffle 40 is converted into a horizontal flow component, that is, a part of the liquid medium below the guide baffle 40 can flow along the first part 231 of the bottom wall 23 to the working area 242, thereby improving the uniformity of the temperature field in the upper and lower directions of the working area 242.

[0138] It should be noted that the up and down directions are Figure 3 The z direction is shown in the figure, which is the height direction of the slot body 20. During the calibration process, the slot opening of the slot body 20 faces upward.

[0139] In some examples, the length of the first portion 231 may be 1 / 3, 1 / 2, etc., of the length of the bottom wall 23 . The embodiment of the present application does not limit the length of the first portion 231 .

[0140] In some examples, the guide holes 44 are spaced apart on the guide baffle 40 in the up and down directions. In this way, when the liquid medium in the stirring zone 241 flows from top to bottom through the guide baffle 40 under the stirring of the stirring impeller 51, a portion of the liquid medium will continuously pass through the guide holes 44 from top to bottom into the working zone 242, thereby improving the uniformity of the temperature field in the up and down directions of the working zone 242.

[0141] During the specific setting, multiple guide holes 44 can be spaced apart at the same height of the guide baffle 40 so that the liquid medium at the same height can quickly flow into the working area 242 through the multiple guide holes 44. On the one hand, the uniformity of the temperature field in the width direction of the working area 242 can be improved. On the other hand, the flow speed of the liquid medium in the stirring area 241 to the working area 242 can also be increased, so that the temperature of the liquid medium in the working area 242 can quickly reach the target temperature.

[0142] Generally, due to reasons such as the slot structure and the heat conduction of the instrument to be measured, the closer to the slot, that is, the upward direction, the greater the heat leakage effect of the temperature field in the slot cavity, and the closer to the bottom of the slot cavity, that is, the downward direction, the smaller the heat leakage effect of the temperature field in the slot cavity. In the embodiment of the present application, the liquid medium passes through the stirring impeller 51 and obtains a motion component in the rotation direction and a motion component in the downward direction, so that a part of the liquid medium enters the working area through the guide hole 44, thereby compensating for the heat leakage in the working area, and the other part of the liquid medium continues to flow downward in the stirring area. The closer to the bottom wall 23, the less heat is needed to supplement the temperature field in the slot cavity. Accordingly, the smaller the motion component in the rotation direction of the liquid medium, the less liquid medium flows through the guide hole 44 into the working area, and the less heat is supplemented to the temperature field. The closer to the stirring impeller 51, the more heat is needed to supplement the temperature field in the slot cavity. Accordingly, the greater the motion component in the rotation direction of the body medium, the more liquid medium flows through the guide hole 44 into the working area, and the more heat is supplemented to the temperature field, thereby improving the temperature field uniformity in the vertical direction.

[0143] The width direction of the working area 242 may refer to the y direction in FIG. 5 .

[0144] In some examples, multiple rows of guide holes 44 can be spaced apart in the height direction of the guide baffle 40, wherein the top row of guide holes 44 can be close to the upper edge of the guide baffle 40, and the bottom row of guide holes 44 can be close to the lower edge of the guide baffle 40. In this way, it can be ensured that the liquid medium flowing through the guide baffle 40 from top to bottom can be uniformly discharged horizontally to the working area 242 in the entire height direction of the guide baffle 40, thereby improving the temperature field uniformity of the working area 242 in the upper and lower directions.

[0145] In some examples, the first portion 231 of the bottom wall 23 is at least partially located between the guide baffle 40 and the first side wall 21, that is, located on the side of the guide baffle 40 facing the first side wall 21, and the upper edge of the first portion 231 is higher than the lower edge of the guide baffle 40. In this way, when the liquid medium reaches the first portion 231 of the bottom wall 23, the liquid medium is driven by the stirring impeller 51 and flows toward the working area 242. During the process, a part of the liquid medium passes through the guide hole 44 and enters the working area 242, and a part of the liquid medium is blocked by the guide baffle 40 and returns to the stirring area 241 to continue mixing, thereby improving the uniformity of the temperature field in the up and down directions, and will not directly enter the working area 242 along the first portion 231 when reaching the first portion 231.

[0146] In some examples, the stirring impeller 51 may be located above the first portion 231. In this way, when the liquid medium in the stirring zone 241 flows from top to bottom through the guide baffle 40 under the stirring of the stirring impeller 51, a portion of the liquid medium will pass through the guide hole 44 and enter the working zone 242, and a portion of the liquid medium will be blocked by the guide baffle 40 and return to the stirring zone 241 to continue mixing. When the liquid medium reaches below the stirring impeller 51, the component of the horizontal flow generated by the stirring impeller 51 is reduced, so that the liquid medium below the stirring impeller 51 flows downward. The component is converted into a horizontal flow component under the action of the first part 231, that is, a part of the liquid medium below the stirring impeller 51 can flow to the working area 242 along the first part 231 of the bottom wall 23, that is, the part above the stirring impeller 51 can enter the working area 242 through the guide hole 44, and the part below the stirring impeller 51 can be guided by the first part 231 and smoothly enter the working area 242. In this way, the entire stirring area 241 and the working area 242 form circulation paths with different ranges, which improves the uniformity of the temperature field in the up and down directions.

[0147] In some examples, the distance between the stirring impeller 51 and the first part 231 is greater than the distance between the upper edge of the guide baffle 40 and the stirring impeller 51, so as to reduce the flow rate of the liquid medium near the stirring impeller 51 flowing directly from the first part 231 to the working area 242 during the process of the stirring impeller 51 stirring the liquid medium. At the same time, the flow rate of the liquid medium colliding with the guide baffle 40 under the drive of the stirring impeller 51 is increased, so as to improve the mixing effect in the stirring area 241, thereby improving the uniformity of the liquid medium entering the working area 242 from the stirring area 241 in the horizontal and height directions.

[0148] In some examples, when the guide baffle 40 is set, its two ends can be retracted toward the first side wall 21, and the distance between one end of the guide baffle 40 and the first side wall 21 is smaller than the distance between the middle of the guide baffle 40 and the first side wall 21.

[0149] For example, the two ends of the guide baffle 40 along the width direction can be retracted toward the first side wall 21, or the two opposite ends of the guide baffle 40 along the height direction can be retracted toward the first side wall 21. In this way, the spatial size of the stirring zone 241 formed between the guide baffle 40 and the first side wall 21 can be reduced, thereby increasing the flow rate of the liquid medium in the stirring zone 241.

[0150] In some examples, the guide baffle 40 may be configured as an arc-shaped baffle that converges toward the first side wall 21 .

[0151] Reference Figure 5 and Figure 6 As shown, in other examples, the guide baffle 40 may include a first guide baffle 41, a second guide baffle 42, and a third guide baffle 43. One end of the first guide baffle 41 is connected to the second guide baffle 42, and the other end of the first guide baffle 41 is connected to the third guide baffle 43. The first guide baffle 41 and the second guide baffle 42 form an obtuse angle with their openings facing the stirring zone 241, and the first guide baffle 41 and the third guide baffle 43 form an obtuse angle with their openings facing the stirring zone 241. In other words, the second guide baffle 42 and the third guide baffle 43 of the guide baffle 40 are inclined toward the first sidewall 21 to reduce the spatial size of the stirring zone 241.

[0152] Furthermore, the aforementioned arrangement of the guide baffle 40 allows the guide baffle 40 to be perpendicular to, or at a significant angle to, the flow direction of the liquid medium driven by the stirring impeller 51, thereby enhancing the barrier effect on the liquid medium and thereby improving the flow mixing efficiency. Furthermore, when the liquid medium flows out of the guide gap between the second guide baffle 42 and the tank wall, a portion of the liquid medium is guided by the second guide baffle 42 toward the center of the tank cavity 24, extending the flow path of the liquid medium within the stirring zone 241, improving the flow mixing effect of the liquid medium, and thereby improving the uniformity of the temperature field.

[0153] In some examples, the first guide plate 41 , the second guide plate 42 , and the third guide plate 43 may all be provided with guide holes 44 .

[0154] In other examples, guide holes 44 may be provided on at least one of the first guide plate 41, the second guide plate 42, and the third guide plate 43, and guide holes 44 may not be provided on at least another guide plate, so that the liquid medium in the tank cavity 24 can circulate between the stirring zone 241 and the working zone 242 through at least some of the guide holes 44 on the guide plates, and can also achieve sufficient mixing in the stirring zone 241 under the obstruction of some of the guide plates.

[0155] For example, first guide holes 411 and 44 are provided on the first guide plate 41, so that the liquid medium in the stirring zone 241 flows to the working zone 242 through the first guide holes 411 and 44 near the second guide plate 42, and the liquid medium in the working zone 242 flows to the stirring zone 241 through the first guide holes 411 and 44 near the third guide plate 43. That is, circulation between the stirring zone 241 and the working zone 242 is achieved through the first guide holes 411 and 44 on the first guide plate 41.

[0156] In addition, the second guide plate 42 can be a non-porous plate, so that the liquid medium in the stirring zone 241 is blocked by the second guide plate 42 when flowing toward the working zone 242, thereby improving the mixing degree of the liquid medium heat exchanged by the first temperature control module 31 and the first side wall 21 in the stirring zone 241, thereby ensuring the temperature uniformity of the liquid medium entering the working zone 242.

[0157] In some examples, a guide gap may be provided between the second guide plate 42 and the first side wall 21, so that the liquid medium in the stirring zone 241 flows to the working zone 242 through the guide gap, thereby preventing part of the liquid medium between the second guide plate 42 and the first side wall 21 from being in contact with the first temperature control module and the first side wall 21 for too long, thereby preventing the temperature from being too high or too low. Part of the liquid medium between the second guide plate 42 and the first side wall 21 flows to the working zone 242 in a timely manner through the guide gap between the second guide plate 42 and the first side wall 21, thereby improving the temperature uniformity of the working zone 242 in the width direction.

[0158] In some examples, third guide holes 431 and 44 are provided on the third guide plate 43 , so that the liquid medium in the working area 242 flows to the stirring area 241 through the third guide holes 431 and 44 .

[0159] Reference Figure 5As shown, for example, a first guide hole is provided on the first guide plate 41, the second guide plate 42 is a non-porous plate, and a third guide hole is provided on the third guide plate 43. If the stirring impeller 51 rotates clockwise, the lower part of the first guide plate 41 (i.e., the side in the opposite direction of y) is the second guide plate 42, and the upper part of the first guide plate 41 (i.e., the side in the y direction) is the third guide plate 43. When the stirring impeller 51 rotates clockwise, the liquid medium in the stirring zone 241 will be mixed clockwise under the drive of the stirring impeller 51, wherein the portion of the liquid medium in the stirring zone 241 close to the second guide partition plate 42 will move toward the second guide partition plate 42. Because the second guide partition plate 42 is not provided with a guide hole 44, the liquid medium on the side of the second guide partition plate 42 will continue to return to the stirring zone 241 for stirring and mixing under the obstruction of the second guide partition plate 42. When the liquid medium in the stirring zone 241 is mixed, it will flow from the first guide hole 411 and the guide hole 44 of the first guide partition plate 41 close to the second guide partition plate 42 to the working zone 242 when passing through the first guide partition plate 41. During the clockwise rotation of the stirring impeller 51, the liquid medium close to the third guide partition plate 43 will move in the direction away from the third guide partition plate 43, so that the liquid medium in the working zone 242 will pass through the first guide partition plate 41. The first guide holes 411 and 44 near the third guide plate 43 in the plate 41 flow toward the stirring zone 241, and the third guide holes 431 and 44 of the third guide plate 43 flow toward the stirring zone 241. In this way, it is ensured that the liquid medium in the stirring zone 241 does not directly enter the working zone 242 through the guide holes 44 under the stirring of the stirring impeller 51. Instead, it will first continue to mix in the stirring zone 241 under the obstruction of the second guide plate 42, and then pass through a portion of the first guide holes 411 and 44 after being temperature-controlled by the first temperature control module 31 and the first side wall 21, such as the working zone 242. The liquid medium in the working zone 242 will also enter the stirring zone 241 through a portion of the first guide holes 411 and 44 and the third guide holes 431 and 44, thereby achieving sufficient mixing of the liquid media in the stirring zone 241 and the working zone 242, thereby improving the temperature uniformity of the liquid medium in the working zone 242.

[0160] Reference Figure 5As shown, for example, a first guide hole is provided on the first guide plate 41, the second guide plate 42 is a non-porous plate, and a third guide hole is provided on the third guide plate 43. If the stirring impeller 51 rotates counterclockwise, the upper side of the first guide plate 41 (i.e., the side along the y direction) is the second guide plate 42, and the lower side of the first guide plate 41 (i.e., the side along the opposite y direction) is the third guide plate 43. When the stirring impeller 51 rotates counterclockwise, the liquid medium in the stirring zone 241 will be mixed counterclockwise under the drive of the stirring impeller 51, wherein the portion of the liquid medium in the stirring zone 241 close to the second guide partition plate 42 will move toward the direction of the second guide partition plate 42. Because the second guide partition plate 42 is not provided with a guide hole 44, the liquid medium located on the side of the second guide partition plate 42 will continue to return to the stirring zone 241 for stirring and mixing under the obstruction of the second guide partition plate 42. When the liquid medium in the stirring zone 241 is mixed, it will flow from the first guide hole 411 and the guide hole 44 of the first guide partition plate 41 close to the second guide partition plate 42 to the working zone 242 when passing through the first guide partition plate 41. During the clockwise rotation of the stirring impeller 51, the liquid medium close to the third guide partition plate 43 will move in the direction away from the third guide partition plate 43, so that the liquid medium in the working zone 242 will pass through the first guide partition plate The first guide holes 411 and 44 near the third guide plate 43 in the plate 41 flow toward the stirring zone 241, and the third guide holes 431 and 44 of the third guide plate 43 flow toward the stirring zone 241. In this way, it is ensured that the liquid medium in the stirring zone 241 does not directly enter the working zone 242 through the guide holes 44 under the stirring of the stirring impeller 51. Instead, it will first continue to mix in the stirring zone 241 under the obstruction of the second guide plate 42, and then pass through a portion of the first guide holes 411 and 44 after being temperature-controlled by the first temperature control module 31 and the first side wall 21, such as the working zone 242. The liquid medium in the working zone 242 will also enter the stirring zone 241 through a portion of the first guide holes 411 and 44 and the third guide holes 431 and 44, thereby achieving sufficient mixing of the liquid media in the stirring zone 241 and the working zone 242, thereby improving the temperature uniformity of the liquid medium in the working zone 242.

[0161] Reference Figure 5 As shown, in some examples, the constant temperature liquid tank may further include a temperature measuring element for measuring the temperature of the liquid medium. To distinguish it from the temperature measuring element for measuring the temperature of the first side wall 21 described below, the temperature measuring element for measuring the temperature of the liquid medium may be referred to as the first temperature measuring element 34.

[0162] The first temperature measuring element 34 may be a thermocouple, a thermal resistor, or other types of temperature sensors or temperature measuring components.

[0163] During operation, a temperature measuring element, such as the first temperature measuring element 34, sends the temperature measurement result to the control device. The control device controls the output power of the first temperature control module 31 and the second temperature control module 32 based on the temperature value measured by the first temperature measuring element 34, so that the liquid medium finally reaches the target temperature value.

[0164] In some examples, a temperature measuring element, such as the first temperature measuring element 34, can be set in the working area 242, or can be set between the working area 242 and the stirring area 241. For example, the first temperature measuring element 34 can be connected to the first guide plate 41 or the third guide plate 43 of the guide baffle 40 to measure the temperature of the liquid medium flowing through the working area 242 to the stirring area 241.

[0165] By positioning the first temperature measuring element 34 on the first flow guide plate 41 or the third flow guide plate 43, the space occupied by the first temperature measuring element 34 in the working area 242 can be reduced, thereby increasing the effective use of the working area 242, thereby ensuring that the instrument under test can be inserted into the working area 242 at a suitable position for temperature calibration. Furthermore, compared to positioning the first temperature measuring element 34 elsewhere in the working area 242, positioning the first temperature measuring element 34 on the first flow guide plate 41 or the third flow guide plate 43 to measure the temperature of the liquid medium flowing from the working area 242 to the stirring area 241 can improve the accuracy of temperature measurement of the liquid medium in the working area 242.

[0166] Furthermore, if the first temperature measuring element 34 is set on the first guide plate 41, when the adjustment of the temperature control component causes the medium temperature of the working area to change, since the circulation range of the liquid medium flowing through the first guide plate 41 is smaller, the first temperature measuring element 34 can obtain a measurement result that can characterize the temperature change of the working area more quickly. If the first temperature measuring element 34 is set on the third guide plate 43, since the circulation range of the liquid medium flowing through the first guide plate 41 is larger, the measurement result of the first temperature measuring element 34 can more representatively represent the overall temperature of the working area.

[0167] Reference Figure 5 As shown, in some examples, the constant temperature liquid tank may further include a second temperature measuring element 35, which is connected to the outer surface of the first side wall 21 to measure the temperature of the outer surface of the first side wall 21. For example, the second temperature measuring element 35 may be disposed on the temperature averaging plate 323 of the second temperature control module 32. The second temperature measuring element 35 may transmit the temperature measurement result to the control device, which controls the output power of the second temperature control module 32 based on the temperature value measured by the second temperature measuring element 35, so that the liquid medium ultimately reaches the target temperature value.

[0168] Reference Figure 5 and Figure 6As shown, in some examples, the constant temperature liquid tank may also include a guide fixing portion arranged above the tank body 20, and the guide fixing portion is connected to the guide baffle 40 through a guide fixing column 45. The radial cross-sectional area of ​​the guide fixing column 45 is smaller than the radial cross-sectional area of ​​the guide baffle 40, and the guide baffle 40 does not contact the inner side of the tank body 20.

[0169] For example, the guide baffle 40 has no contact with the bottom wall 23, the first side wall 21, the second side wall 22, the third side wall and the fourth side wall of the trough body 20, and is only fixed to the guide fixing part by a guide fixing column 45 with a smaller radial dimension. In this way, the contact area between the guide baffle 40 and the side wall of the trough body 20 can be reduced, and the heat transfer from the guide baffle 40 to the trough body 20 can be reduced, thereby reducing the impact of the temperature change of the guide baffle 40 on the temperature of the liquid medium, and improving the temperature control accuracy of the liquid medium by the first temperature control module 31 and the second temperature control module 32.

[0170] In addition, the liquid medium can pass through the guide gap between the side of the guide baffle 40 and the side wall of the trough body 20, thereby improving the uniformity of the liquid medium in the trough cavity 24 in the horizontal direction. The liquid medium can also pass through the bottom of the guide baffle 40, thereby improving the uniformity of the liquid medium in the trough cavity 24 in the height direction.

[0171] In some examples, a tank cover 60 is provided on the top of the tank body 20, and the tank cover 60 can be fixed to the opening at the top of the housing 10 of the constant temperature liquid tank. The stirring impeller 51 can be fixed to the tank cover 60 or the top of the housing 10 via the stirring mounting portion 54. For example, the stirring impeller 51 is connected to the output shaft of the stirring motor 53 via the driving rod 52, so that the output shaft of the stirring motor 53 drives the stirring impeller 51 to rotate via the driving rod 52. Among them, the stirring motor 53 is fixed to the stirring mounting portion 54.

[0172] In some examples, the guide fixing portion can be fixed on the stirring mounting portion 54 or on the top of the shell 10. The embodiment of the present application does not limit the fixing method of the guide fixing portion.

[0173] Reference Figure 2 、 Figure 4 and Figure 5 As shown, in some examples, the constant temperature liquid tank further includes a thermal insulation layer 70 , which wraps the second temperature control module 32 and the outer side of the tank body 20 .

[0174] Because the second temperature control module 32 is disposed on the outer surface of the first side wall 21 of the tank body 20, the thermal insulation layer 70 can be attached to the outer surface of the second temperature control module 32, the outer surface of the first side wall 21 not covered by the second temperature control module 32, and other side walls. In this way, compared to setting a gap or air duct on the outer side of the first side wall 21, the heat transfer between the tank body 20 and the surrounding environment can be reduced, and the uniformity of the temperature field in the tank cavity 24 can be improved. In some examples, in addition to wrapping the outer surface of the second temperature control module 32 and the outer surface of the first side wall 21 not covered by the second temperature control module 32, the thermal insulation layer 70 can also wrap at least one of the second side wall 22, the bottom wall 23, the third side wall, and the fourth side wall. For example, the thermal insulation layer 70 can also wrap the second side wall 22 and the bottom wall 23, or wrap the second side wall 22, the bottom wall 23, the third side wall, and the fourth side wall. The embodiment of the present application does not limit the size of the area wrapped by the thermal insulation layer 70.

[0175] In some examples, when the second temperature control module 32 includes a refrigeration cavity 321, the thermal insulation layer 70 is laminated to the second temperature control module 32 and the outer side of the tank body 20 to increase the contact area between the thermal insulation layer 70 and the second temperature control module 32 and the outer side wall of the tank body 20, thereby reducing heat transfer between the second temperature control module 32 and the tank body 20 and the surrounding environment. This allows the refrigerant in the refrigeration cavity 321 to cool the first side wall 21 to a greater extent, while reducing heat exchange between the refrigerant and the surrounding environment, reducing the power consumption of the refrigeration compressor 33, and improving the cooling efficiency of the refrigerant in the refrigeration cavity 321 on the first side wall 21. In addition, the thermal insulation layer 70 is laminated to the second temperature control module 32 and the outer side of the tank body 20, reducing any air gaps that may exist on the outer side of the tank body 20. Compared to providing a heat dissipation duct on the outer side of the tank body 20, this reduces the possibility of heat convection or other heat exchange on the outer side of the tank body 20, thereby improving the uniformity of the temperature field within the tank body 20. Since the slot 25 at the top of the slot cavity 24 needs to install or replace the instrument to be tested, the sealing of the top of the slot cavity 24 is poorer than the sealing of other areas of the slot cavity 24, resulting in heat leakage in the slot 25, causing the temperature of the liquid medium near the top of the slot cavity 24 to drop faster.

[0176] Reference Figure 4As shown, the constant temperature liquid tank may include a cooling system 80, which may include a heat dissipation duct 81 formed between the bottom wall 23 of the constant temperature liquid tank and the insulation layer 70. The outlet of the heat dissipation duct 81 can be switchably set on the surface of the constant temperature liquid tank. In this way, the airflow of the heat dissipation duct 81 can exchange heat with the liquid medium at the bottom of the tank cavity 24. During the temperature verification process, the outlet of the heat dissipation duct 81 is closed, and the heat dissipation duct 81 forms a closed cavity to insulate the bottom of the tank cavity 24. After the temperature verification is completed, the slot is opened, and the outlet of the heat dissipation duct 81 is opened. The liquid medium near the slot area can dissipate heat naturally, and the bottom of the tank cavity 24 can be forced to dissipate heat through the heat dissipation duct 81, which improves the heat dissipation efficiency and solves the problem of slow heat dissipation of the liquid medium at the bottom of the tank cavity 24.

[0177] In some examples, when the second temperature control module 32 includes a heating body, such as a second heating body 322, the thermal insulation layer 70 can be attached to the second side wall 22 to reduce heat transfer between the second side wall 22 and the surrounding environment, thereby ensuring temperature stability in the middle area of ​​the slot cavity 24. It is understandable that if a heat dissipation duct is provided around the second side wall 22, during the temperature calibration process, due to different heat leakage conditions of the slot body in the upper and lower directions, there is a temperature difference between the position near the slot opening and the middle and lower part of the slot bottom. This temperature difference will cause the air in the heat dissipation duct to also produce a temperature difference, thereby forming heat convection and affecting the uniformity of the temperature field in the slot. The advantage of this example is that attaching the thermal insulation layer 70 to the second side wall 22 can solve the problem of heat convection in the aforementioned heat dissipation duct. At the same time, the heat dissipation duct 81 of the embodiment of the present application is located at the bottom of the slot cavity 24. The heat leakage conditions in this area are basically the same as you think, which can also solve the problem of heat convection in the aforementioned heat dissipation duct.

[0178] In some examples, a first vent 84 and a second vent 85 are formed on the housing 10 (see Figure 1 As shown), the outlet of the heat dissipation duct 81 is connected to the outside of the shell 10, i.e., the outside of the constant temperature liquid tank, through the first vent 84. The inlet of the heat dissipation duct 81 is located in the shell 10, and a first fan 82 is provided between the inlet of the heat dissipation duct 81 and the second vent 85. The first fan 82 is configured to blow the air blown into the shell 10 by the second vent 85 into the heat dissipation duct 81 and discharge it through the outlet of the heat dissipation duct 81. In this way, when it is necessary to quickly cool the liquid medium at the bottom of the tank cavity 24, forced air cooling can be used to dissipate heat. For example, the first fan 82 is turned on so that the cold air entering the shell 10 through the second vent 85 can flow through the heat dissipation duct 81 to carry away the heat transferred from the liquid medium to the bottom wall 23. In addition, natural heat dissipation or other heat dissipation methods can be used for the slot 25 with a lower temperature to improve the heat dissipation efficiency of the tank body 20.

[0179] In some examples, a first air valve can be provided at the outlet of the heat dissipation duct 81, and a second air valve can be provided at the inlet of the heat dissipation duct 81 to open or block the heat dissipation duct 81 when needed. For example, when it is necessary to keep the liquid medium in the tank cavity 24 warm, the first air valve and the second air valve can be closed. When it is necessary to quickly cool the liquid medium in the tank cavity 24, the first air valve and the second air valve can be opened.

[0180] In some examples, there may be only one of the first air valve and the second air valve. For example, the first air valve may be provided only at the outlet of the heat dissipation air duct 81 , or the second air valve may be provided only at the inlet of the heat dissipation air duct 81 .

[0181] In some examples, the second vent 85 and the first vent 84 may be disposed on the outer shell of the housing 10 in different directions to reduce interference between airflows at the first vent 84 and the second vent 85 .

[0182] Reference Figure 1 、 Figure 2 and Figure 4 As shown, for example, the housing 10 may include a first shell 11, a second shell 12, a third shell 13, a fourth shell and a bottom shell 14, and the first shell 11, the second shell 12, the third shell 13, the fourth shell and the bottom shell 14 form a device body with an open top; wherein the first shell 11 and the second shell 12 are located on opposite sides of the device body, for example, the first shell 11 and the second shell 12 are arranged relative to each other along the x-direction, and a display module 90 is arranged on the upper part of the first shell 11, and the third shell 13 and the fourth shell are located on opposite sides of the device body, for example, the third shell 13 and the fourth shell are arranged relative to each other along the y-direction.

[0183] Reference Figure 1 As shown, a display module 90 such as a display screen can be provided on the first housing 11 , and the display screen is used to display parameters such as the current temperature of the liquid medium, the output power of the first temperature control module 31 and the second temperature control module 32 , and the like.

[0184] The tank cover 60 is disposed on the notch 25 of the tank body 20 , and the tank cover 60 and the stirring mounting portion 54 may both be located on the top opening of the shell 10 .

[0185] In some examples, the second sidewall 22 of the trough body 20 is connected to the inner wall of the second housing 12, and the first vent 84 can be provided on the second housing 12. There can be one or more second vents 85. When there are multiple second vents 85, the multiple second vents 85 can be provided on at least one of the first housing 11, the third housing 13, the fourth housing, and the bottom housing 14.

[0186] For example, second vents 85 can be provided in the areas of the first housing 11, the third housing 13, the fourth housing, and the bottom housing 14 near the first fan 82, so that a duct for air circulation is formed by the plurality of second vents 85, the space where the first fan 82 is located, the heat dissipation duct 81, and the first vents 84. When it is necessary to quickly cool the bottom wall 23 of the tank body 20, the cold air blown into the interior of the housing 10 through the second vents 85 can be blown into the heat dissipation duct 81 through the inlet of the heat dissipation duct 81 by the first fan 82, thereby cooling the bottom wall 23 of the tank body 20, and then blown to the outside of the housing 10 through the outlet of the heat dissipation duct 81 and the first vents 84.

[0187] In some examples, a third vent 86 is also formed on the shell 10, and the third vent 86 and the second vent 85 have different directions. A second fan 83 is arranged between the third vent 86 and the second vent 85, and the second fan 83 is configured to discharge the air blown into the shell 10 through the second vent 85 to the outside of the shell 10 through the third vent 86.

[0188] In some examples, the second fan 83 can be located near the third vent 86, and the space where the second fan 83 is located is connected to the third vent 86 and the second vent 85, so that the space where the second fan 83 is located and the second vent 85 and the third vent 86 form an air duct for air flow, so that after the second fan 83 is started, air can be blown into the interior of the shell 10 through the second vent 85 to cool the devices in the shell 10, and then the air after heat exchange with the devices flows out to the outside of the shell 10 through the third vent 86.

[0189] It can be understood that if the second fan 83 is reversed, that is, the second fan 83 can blow external air into the interior of the shell 10 through the third vent 86, and then blow it out to the outside of the shell 10 through the second vent 85, the air flow direction can be reversed, and a similar cooling effect can be achieved.

[0190] For example, the third vent 86 may be provided in a lower region of the second housing 12 , for example, below the first vent 84 .

[0191] The components in the housing 10 may include a control device, a refrigeration compressor 33 and the like.

[0192] Reference Figure 1 and Figure 2 As shown, in some examples, a fourth vent 56 can be provided on the stirring mounting portion 54, and a third fan 55 is provided on the stirring mounting portion 54. The third fan 55 cooperates with the fourth vent 56 to dissipate heat for the stirring motor 53, ensuring that the stirring motor 53 is in a normal working state.

[0193] Reference Figure 2 As shown, in some examples, the constant temperature liquid tank may include a liquid storage tank 100 and a drain pipe 200. The liquid storage tank 100 is disposed outside the housing 10 of the constant temperature liquid tank. For example, the liquid storage tank 100 may be disposed on the outer wall of the second housing 12. One end of the drain pipe 200 is connected to the liquid storage tank 100, and the other end of the drain pipe 200 is connected to the upper portion of the tank cavity 24. In this way, when the liquid medium expands due to heat, if it exceeds or is about to exceed the position of the drain pipe 200, it can be discharged from the drain pipe 200 to the liquid storage tank 100, thereby reducing the risk of the liquid medium overflowing from the tank opening when the tank cavity 24 is overfilled.

[0194] In some examples, one end of the drain pipe 200 may extend into the tank opening of the liquid storage tank 100 , or may be located above the tank opening of the liquid storage tank 100 , as long as the liquid medium in the drain pipe 200 can flow into the liquid storage tank 100 .

[0195] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

[0196] An embodiment of the present application further provides a temperature control method for a constant temperature liquid tank, wherein the constant temperature liquid tank can be the constant temperature liquid tank in any of the above embodiments, and the specific structure of the constant temperature liquid tank is not described in detail here.

[0197] In some examples, a method for controlling the temperature of a constant temperature liquid bath may include:

[0198] S101, obtaining the target temperature and the current temperature of the liquid medium in the tank cavity;

[0199] For example, measurement information may be acquired from a first temperature measuring element, and the current temperature of the liquid medium in the tank cavity may be determined based on the measurement information of the first temperature measuring element.

[0200] In addition, the target temperature is the calibration temperature of the instrument to be tested.

[0201] S102 : adjusting the output power of the first temperature control module and the second temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity.

[0202] For example, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the heating power of the first temperature control module and the second temperature control module can be reduced at the same time, or the heating power of the first temperature control module and the second temperature control module can be reduced successively to increase the current temperature of the liquid medium in the tank cavity until the current temperature of the liquid medium in the tank cavity is equal to the target temperature.

[0203] Because the second temperature control module is arranged outside the tank cavity, the second temperature control module first controls the temperature of the outer surface of the first side wall, such as heating. The heat first reaches the inner surface of the first side wall through the first side wall, and then is transferred to the liquid medium. That is, there is a long heat transfer response time from adjusting the output power of the second temperature control module to the change in the temperature of the liquid medium in the tank cavity, which causes the temperature of the liquid medium in the tank cavity to fluctuate greatly, thereby affecting the accuracy of the temperature verification result.

[0204] In other examples, the temperature control method of the constant temperature liquid bath may include:

[0205] S201: Obtain a target temperature, and determine a temperature control value of a second temperature control module according to the target temperature.

[0206] For example, since the second temperature control module is arranged outside the tank cavity, the temperature control temperature value of the second temperature control module can be determined according to factors such as the target temperature, the thickness of the first side wall of the tank body, the material of the tank body and the temperature control parameters of the second temperature control module.

[0207] For example, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the temperature control value of the second temperature control module can be set to a value higher than the target temperature. If the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the temperature control value of the second temperature control module can be set to a value lower than the target temperature.

[0208] S202: Control the output power of the second temperature control module according to the current temperature and the temperature control value of the second temperature control module, so that the current temperature of the second temperature control module reaches the temperature control value.

[0209] For example, if the current temperature of the second temperature control module is lower than the temperature control value, the heating power of the second temperature control module can be increased, or the cooling power of the second temperature control module can be reduced until the current temperature of the second temperature control module reaches the temperature control value.

[0210] S203 : Control the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity, so that the current temperature of the liquid medium in the tank cavity reaches the target temperature value.

[0211] For example, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the cooling power of the first temperature control module can be increased, or the heating power of the first temperature control module can be reduced until the current temperature of the liquid medium in the tank cavity reaches the target temperature.

[0212] Since factors such as the working environment, the type of liquid medium, and the volume of the tank cavity may vary in different calibration scenarios, the determined temperature control temperature value may not match the target temperature value, resulting in the temperature of the liquid medium in the tank cavity being too high or too low, affecting the accuracy of the temperature calibration result. In some other examples, the temperature control method of the constant temperature liquid tank may include:

[0213] S301: Obtain a target power range of a first temperature control module.

[0214] It should be noted that the target power range of the first temperature control module can be determined based on the minimum output power and maximum output power of the first temperature control module. The upper limit value of the target power range is less than or equal to the maximum output power of the first temperature control module, the lower limit value of the target power range is greater than or equal to the minimum output power of the first temperature control module, and the upper limit value of the target power range is greater than the lower limit value of the target power range.

[0215] In some examples, when the first temperature control module is heating the liquid medium in the tank cavity, that is, when the first temperature control module is a heating module, the lower limit of the target power range can be greater than or equal to the minimum heating power of the first temperature control module, and the upper limit of the target power range can be less than or equal to the maximum heating power of the first temperature control module. It is understood that the maximum heating power of the first temperature control module is the rated heating power of the first temperature control module.

[0216] In some examples, when the first temperature control module is cooling the liquid medium in the tank cavity, that is, when the first temperature control module is a cooling module, the lower limit of the target power range can be greater than or equal to the minimum cooling power of the first temperature control module, and the upper limit of the target power range can be less than or equal to the maximum cooling power of the first temperature control module. It is understood that the maximum cooling power of the first temperature control module is the rated cooling power of the first temperature control module.

[0217] In some examples, the first temperature control module only includes the first heating body. When the first temperature control module is needed to participate in the cooling process, the maximum heating power of the first heating body can be used as the minimum cooling power of the first temperature control module (expressed by a negative value), and the minimum heating power of the first heating body can be used as the maximum cooling power of the first temperature control module, for example, the maximum cooling power can be 0; in other examples, the first temperature control module only includes the first cooling body. When the first temperature control module is needed to participate in the heating process, the maximum cooling power of the first cooling body can be used as the minimum heating power of the first temperature control module (expressed by a negative value), and the minimum cooling power of the first cooling body can be used as the maximum heating power of the first temperature control module, for example, the maximum heating power can be 0.

[0218] S302: Obtain the target temperature and the current temperature of the liquid medium in the tank cavity.

[0219] The target temperature is the calibration temperature of the instrument to be tested, which is determined according to the actual calibration requirements.

[0220] Based on the above example, it can be seen that the constant temperature liquid tank includes a first temperature measuring element, which is arranged in the tank cavity; obtaining the target temperature and the current temperature of the liquid medium in the tank cavity includes: obtaining measurement information from the first temperature measuring element, and determining the current temperature of the liquid medium in the tank cavity based on the measurement information of the first temperature measuring element.

[0221] For example, the temperature measured by the first temperature measuring element is the current temperature of the liquid medium in the tank cavity. Of course, depending on the position of the first temperature measuring element in the tank cavity, the temperature value measured by the first temperature measuring element can be processed to obtain the current temperature of the liquid medium in the tank cavity. For example, if the first temperature measuring element is located near the slot opening, the temperature value measured by the first temperature measuring element may be lower than the current temperature of the liquid medium in the tank due to heat leakage from the slot opening. In this case, the temperature value measured by the first temperature measuring element can be added to a preset compensation value to obtain the current temperature of the liquid medium in the tank cavity. The preset compensation value can be adjusted based on the actual position of the first temperature measuring element.

[0222] S302 can be implemented in whole or in part before, at the same time as, or after S301. For example, obtaining the target temperature occurs before S301. For another example, obtaining the target temperature occurs during S301. For another example, obtaining the target temperature occurs after S301. It can be understood that S301 is completed no later than S304, and S302 is completed no later than S303.

[0223] S303: Control the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity.

[0224] Because the first temperature control module is arranged inside the tank cavity, the first temperature control module can quickly respond to the temperature of the liquid medium in the tank cavity. The temperature of the liquid medium in the tank cavity can be controlled by the first temperature control module so that the current temperature of the liquid medium in the tank cavity can quickly reach the target temperature, thereby improving the temperature control efficiency of the constant temperature liquid tank.

[0225] In some examples, controlling the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity may include:

[0226] S3031. If the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the output power of the first temperature control module may be adjusted in any of the following ways to make the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0227] As a first adjustment method, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the heating power of the first temperature control module can be reduced to gradually reduce the current temperature of the liquid medium in the tank cavity to the target temperature.

[0228] It is understood that the heating power of the first temperature control module can be adjusted once to a first heating power value, which is lower than the current heating power of the first temperature control module and higher than the minimum heating power of the first temperature control module. The heating power of the first temperature control module can also be gradually reduced until the current temperature of the liquid medium in the tank cavity drops to the target temperature.

[0229] As a second adjustment method, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the first temperature control module can be controlled to reach the minimum heating power. In other words, the heating power of the first temperature control module can be directly adjusted to the minimum heating power, and the liquid medium in the tank cavity can be cooled at the minimum heating power until the current temperature of the liquid medium in the tank cavity is reduced to the target temperature.

[0230] As a third adjustment method, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the cooling power of the first temperature control module can be increased to gradually reduce the current temperature of the liquid medium in the tank cavity to the target temperature.

[0231] It is understood that the cooling power of the first temperature control module can be adjusted once to a first cooling power value, where the first cooling power is higher than the current cooling power of the first temperature control module and lower than the maximum cooling power of the first temperature control module. The cooling power of the first temperature control module can also be gradually increased until the current temperature of the liquid medium in the tank cavity drops to the target temperature.

[0232] As a fourth adjustment method, if the current temperature of the liquid medium in the tank cavity is higher than the target temperature, the first temperature control module can be controlled to reach the maximum cooling power. In other words, the cooling power of the first temperature control module can be directly adjusted to the maximum cooling power, and the liquid medium in the tank cavity can be cooled at the maximum cooling power until the current temperature of the liquid medium in the tank cavity drops to the target temperature.

[0233] It is understandable that when the first temperature control module includes a first heating body, and the liquid medium in the tank cavity is cooled by the first heating body, the first and second adjustment methods can be adopted.

[0234] When the first temperature control module includes a refrigeration cavity, and the liquid medium in the tank cavity is cooled by the refrigeration cavity, the third and fourth adjustment methods can be used.

[0235] S3032: If the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the output power of the first temperature control module may be adjusted in any of the following ways to make the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0236] As a first adjustment method, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the heating power of the first temperature control module can be increased to gradually increase the current temperature of the liquid medium in the tank cavity to the target temperature.

[0237] It is understood that the heating power of the first temperature control module can be adjusted to a second heating power value at once, where the second heating power is higher than the current heating power of the first temperature control module. The heating power of the first temperature control module can also be gradually increased until the current temperature of the liquid medium in the tank cavity reaches the target temperature.

[0238] As a second adjustment method, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the first temperature control module can be controlled to reach the maximum heating power. In other words, the heating power of the first temperature control module can be directly adjusted to the maximum heating power, and the liquid medium in the tank cavity can be heated at the maximum heating power until the current temperature of the liquid medium in the tank cavity rises to the target temperature.

[0239] As a third adjustment method, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the cooling power of the first temperature control module can be reduced to gradually increase the current temperature of the liquid medium in the tank cavity to the target temperature.

[0240] It is understood that the cooling power of the first temperature control module can be adjusted once to a second cooling power value, where the second cooling power is lower than the current cooling power of the first temperature control module and higher than the minimum cooling power of the first temperature control module. The cooling power of the first temperature control module can also be gradually reduced until the current temperature of the liquid medium in the tank cavity reaches the target temperature.

[0241] As a fourth adjustment method, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the first temperature control module can be controlled to reach the minimum cooling power. In other words, the cooling power of the first temperature control module can be directly adjusted to the minimum cooling power, and the liquid medium in the tank cavity can be heated at the minimum cooling power until the current temperature of the liquid medium in the tank cavity rises to the target temperature.

[0242] It is understandable that when the first temperature control module includes a first heating body, and the liquid medium in the tank cavity is heated by the first heating body, the first and second adjustment methods can be adopted.

[0243] When the first temperature control module includes a refrigeration cavity, and the temperature of the liquid medium in the tank cavity is increased by the refrigeration cavity, the third and fourth adjustment methods can be used.

[0244] S3033. If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, the current output power of the first temperature control module is kept unchanged. In other words, the current output power of the first temperature control module can ensure that the liquid medium in the tank cavity is at the target temperature.

[0245] It can be understood that the purpose of S303 is to make the current temperature of the liquid medium in the tank cavity reach the target temperature. Based on this purpose, in the actual implementation of S303, the temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature can be used for judgment and control, or the derivative function of the current temperature of the liquid medium in the tank cavity and the target temperature can be used for judgment and control. For this derivative function, the current temperature of the liquid medium in the tank cavity can be the independent variable of the derivative function, and the derivative function can also include other independent variables. As long as the aforementioned technical means of making the current temperature of the liquid medium in the tank cavity reach the target temperature can be achieved, it can be used as a means of controlling the output power of the first temperature control module.

[0246] S304: Adjust the output power of the second temperature control module according to the output power of the first temperature control module and the target power range.

[0247] In S304, the first temperature control module and the second temperature control module jointly heat or cool the liquid medium in the tank cavity, that is, the temperature change of the liquid medium in the tank cavity is related to the sum of the output powers of the first temperature control module and the second temperature control module. According to the output power of the first temperature control module and the target power range, a judgment is made. If the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the first power adjustment parameter is increased. The purpose of increasing the first power adjustment parameter is to increase the output power of the second temperature control module. If the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the first power adjustment parameter is reduced. The purpose of reducing the first power adjustment parameter is to reduce the output power of the second temperature control module. If the output power of the first temperature control module is less than the upper limit of the target power range and greater than the lower limit of the target power range, the first power adjustment parameter is kept unchanged.

[0248] The output power of the second temperature control module is adjusted according to the output power of the first temperature control module and the target power range. The output power of the second temperature control module can be directly adjusted, or the associated index affecting the output power of the second temperature control module can be adjusted, and the output power of the second temperature control module can be affected by the associated index.

[0249] Based on the control method of S304, within one or more control cycles after the medium temperature in the tank cavity reaches the target temperature, the output power of the first temperature control module continues to be less than the upper limit of the target power range and greater than the lower limit of the target power range.

[0250] In some examples, the parameters that affect the adjustment of the second temperature control module include and only include the aforementioned first power adjustment parameter. If so, increasing the first power adjustment parameter will cause the output power of the second temperature control module to increase, and decreasing the first power adjustment parameter will cause the output power of the second temperature control module to decrease.

[0251] In some examples, the parameters affecting the adjustment of the second temperature control module also include a second power adjustment parameter. The independent variable associated with the second power adjustment parameter may include one or more combinations of parameters such as temperature difference, temperature change rate, temperature change trend, and temperature fluctuation amplitude. In this case, the first power adjustment parameter and the second power adjustment parameter jointly affect the output power of the second temperature control module. At this time, increasing the first power adjustment parameter will cause the actual output power of the second temperature control module to be greater than when it is adjusted only according to the second power adjustment parameter. Reducing the first power adjustment parameter will cause the actual output power of the second temperature control module to be smaller than when it is adjusted only according to the second power adjustment parameter.

[0252] In some examples, such as referring to S102, if the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the output power of the second temperature control module needs to be increased from P0 to P1. Then, after combining the examples of S301 to S304, a judgment is made based on the output power of the first temperature control module and the target power range. If the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the output power of the second temperature control module is actually increased from P0 to P2, P2>P1. If the current temperature of the liquid medium in the tank cavity is greater than the target temperature, the output power of the second temperature control module needs to be reduced from P0 to P3. Then, after combining the examples of S301 to S304, a judgment is made based on the output power of the first temperature control module and the target power range. If the output power of the first temperature control module is less than or equal to the lower limit value of the target power range, the output power of the second temperature control module is actually reduced from P0 to P4, P4<P3.

[0253] In some examples, such as referring to S202, the temperature control value of the second temperature control module determined according to the target temperature is T0. Then, after combining the examples of S301 to S304, a judgment is made based on the output power of the first temperature control module and the target power range. If the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the temperature control value of the second temperature control module is actually increased to T1, T1>T0. Conversely, if the output power of the first temperature control module is less than or equal to the lower limit value of the target power range, the temperature control value of the second temperature control module is actually reduced to T2, and T2 is less than T0.

[0254] When the current temperature of the liquid medium in the tank cavity reaches the target temperature, if there is a temperature fluctuation caused by a temporary disturbance, it can be absorbed by the adjustment of the first temperature control module and will not affect the control of the second temperature control module.

[0255] If the output power of the first temperature control module exceeds the target power range during the process of adjusting the current temperature fluctuation of the liquid medium in the tank cavity, that is, the degree of disturbance has exceeded the adjustment capability of the first temperature control module, it can be considered that the disturbance is not temporary but continuous. The output power of the second temperature control module can be adjusted to control the temperature of the liquid medium in the tank cavity through the second temperature control module, so that the current temperature of the liquid medium in the tank cavity is stabilized at the target temperature, thereby improving the accuracy of the temperature calibration results of the constant temperature liquid tank for the instrument to be tested.

[0256] In some examples, adjusting the output power of the second temperature control module based on the output power and the target power range of the first temperature control module, that is, S304, may include adjusting the module desired temperature based on the output power and the target power range of the first temperature control module, and controlling the output power of the second temperature control module based on the module desired temperature:

[0257] S3041: If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, adjust the module desired temperature of the second temperature control module according to the output power of the first temperature control module and the target power range.

[0258] The desired module temperature of the second temperature control module refers to the module temperature of the second temperature control module when the current temperature of the liquid medium in the tank cavity reaches the target temperature. The desired module temperature of the second temperature control module can be set based on factors such as the target temperature and the ambient temperature.

[0259] Among them, if the target temperature is lower than the ambient temperature, the module expected temperature is lower than the target temperature. In this way, it can be ensured that when the module temperature of the second temperature control module is the module expected temperature, the second temperature control module controls the temperature of the liquid in the tank cavity through the first side wall, so that the current temperature of the liquid medium in the tank cavity reaches the target temperature.

[0260] If the target temperature is higher than the ambient temperature, the module expected temperature is higher than the target temperature. In this way, it can be ensured that when the module temperature of the second temperature control module is the module expected temperature, the second temperature control module controls the temperature of the liquid in the tank cavity through the first side wall so that the current temperature of the liquid medium in the tank cavity reaches the target temperature.

[0261] In some examples, if the desired module temperature is lower than the target temperature, that is, the target temperature is lower than the ambient temperature, in other words, during the cooling process of the liquid medium in the tank cavity, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the desired module temperature is lowered. In other words, if the cooling power of the first temperature control module is greater than or equal to the upper limit of the target power range, for example, greater than or equal to the maximum cooling power of the first temperature control module, the desired module temperature can be lowered.

[0262] For example, the preset desired module temperature may be lowered to a first desired module temperature, where the first desired module temperature is lower than the preset desired module temperature.

[0263] When the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the desired module temperature is increased. That is, when the cooling power of the first temperature control module is less than or equal to the lower limit of the target power range, for example, less than or equal to the minimum cooling power of the first temperature control module, the desired module temperature can be increased.

[0264] For example, the preset module desired temperature may be increased to a second module desired temperature, where the second module desired temperature is higher than the preset module desired temperature.

[0265] In some examples, if the expected module temperature is higher than the target temperature, that is, the target temperature is higher than the ambient temperature, in other words, during the heating of the liquid medium in the tank cavity, when the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the expected module temperature is increased, that is, the heating power of the first temperature control module is greater than or equal to the upper limit value of the target power range, for example, when it is greater than or equal to the maximum heating power of the first temperature control module, the expected module temperature can be increased.

[0266] For example, the preset desired module temperature may be increased to a third desired module temperature, where the third desired module temperature is higher than the preset desired module temperature.

[0267] When the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the expected temperature of the module is lowered, that is, when the heating power of the first temperature control module is less than or equal to the lower limit of the target power range, for example, less than or equal to the minimum heating power of the first temperature control module, the expected temperature of the module can be lowered.

[0268] For example, the preset desired module temperature may be lowered to a fourth desired module temperature, where the fourth desired module temperature is lower than the preset desired module temperature.

[0269] S3042. Obtain the current temperature of the second temperature control module, and control the output power of the second temperature control module according to the module desired temperature and the current temperature of the second temperature control module, so that the current temperature of the second temperature control module reaches the module desired temperature.

[0270] Based on the above, it can be seen that the constant temperature liquid tank also includes a second temperature measuring element, and the second temperature measuring element is connected to the second temperature control module. Then, obtaining the current temperature of the second temperature control module may include: obtaining measurement information from the second temperature measuring element, and determining the current temperature of the second temperature control module based on the measurement information of the second temperature measuring element.

[0271] For example, the temperature value measured by the second temperature measuring element can be used as the current temperature of the second temperature control module.

[0272] In some examples, controlling the output power of the second temperature control module based on the desired module temperature and the current temperature of the second temperature control module may include:

[0273] If the current temperature of the second temperature control module is lower than the desired module temperature, the output power of the second temperature control module can be adjusted in any of the following ways to make the current temperature of the second temperature control module reach the desired module temperature.

[0274] As a first adjustment method, if the current temperature of the second temperature control module is lower than the module desired temperature, the heating power of the second temperature control module can be increased to gradually increase the current temperature of the second temperature control module to the module desired temperature.

[0275] It is understood that the heating power of the second temperature control module can be adjusted to a third heating power value at one time, where the third heating power is higher than the current heating power of the second temperature control module. The heating power of the second temperature control module can also be gradually increased until the current temperature of the second temperature control module reaches the desired module temperature.

[0276] As a second adjustment method, if the current temperature of the second temperature control module is lower than the expected temperature of the module, the second temperature control module can be controlled to reach the maximum heating power. In other words, the heating power of the second temperature control module can be directly adjusted to the maximum heating power, and the second temperature control module can be heated at the maximum heating power until the current temperature of the second temperature control module rises to the expected temperature of the module.

[0277] As a third adjustment method, if the current temperature of the second temperature control module is lower than the module desired temperature, the cooling power of the second temperature control module can be reduced to gradually increase the current temperature of the second temperature control module to the module desired temperature.

[0278] It is understood that the cooling power of the second temperature control module can be adjusted all at once to a third cooling power value, where the third cooling power is lower than the current cooling power of the second temperature control module and higher than the minimum cooling power of the second temperature control module. The cooling power of the second temperature control module can also be gradually reduced until the current temperature of the second temperature control module reaches the desired module temperature.

[0279] As a fourth adjustment method, if the current temperature of the second temperature control module is lower than the expected temperature of the module, the second temperature control module can be controlled to reach the minimum cooling power. In other words, the cooling power of the second temperature control module can be directly adjusted to the minimum cooling power, and the second temperature control module can be heated at the minimum cooling power until the current temperature of the second temperature control module rises to the expected temperature of the module.

[0280] It is understandable that when the second temperature control module includes a second heating body, and the liquid medium in the tank cavity is heated by the second heating body, the first and second adjustment methods can be adopted.

[0281] When the second temperature control module includes a refrigeration cavity, and the temperature of the liquid medium in the tank cavity is increased by the refrigeration cavity, the third and fourth adjustment methods can be used.

[0282] In some examples, if the current temperature of the second temperature control module is higher than the desired module temperature, the output power of the second temperature control module can be adjusted in any of the following ways to make the current temperature of the second temperature control module reach the desired module temperature.

[0283] As a first adjustment method, if the current temperature of the second temperature control module is higher than the module desired temperature, the heating power of the second temperature control module can be reduced to gradually reduce the current temperature of the second temperature control module to the module desired temperature.

[0284] It is understood that the heating power of the second temperature control module can be adjusted to a fourth heating power value at one time, where the fourth heating power is lower than the current heating power of the second temperature control module. The heating power of the second temperature control module can also be gradually reduced until the current temperature of the second temperature control module is reduced to the desired module temperature.

[0285] As a second adjustment method, if the current temperature of the second temperature control module is higher than the expected temperature of the module, the second temperature control module can be controlled to reach the minimum heating power. In other words, the heating power of the second temperature control module can be directly adjusted to the minimum heating power, and the second temperature control module can be heated at the minimum heating power until the current temperature of the second temperature control module drops to the expected temperature of the module.

[0286] As a third adjustment method, if the current temperature of the second temperature control module is higher than the module desired temperature, the cooling power of the second temperature control module can be increased to gradually reduce the current temperature of the second temperature control module to the module desired temperature.

[0287] It is understood that the cooling power of the second temperature control module can be adjusted once to a fourth cooling power value, which is higher than the current cooling power of the second temperature control module and lower than the maximum cooling power of the second temperature control module. The cooling power of the second temperature control module can also be gradually increased until the current temperature of the second temperature control module is reduced to the desired module temperature.

[0288] As a fourth adjustment method, if the current temperature of the second temperature control module is higher than the expected temperature of the module, the second temperature control module can be controlled to reach the maximum cooling power. In other words, the cooling power of the second temperature control module can be directly adjusted to the maximum cooling power, and the second temperature control module can be cooled at the maximum cooling power until the current temperature of the second temperature control module is reduced to the expected temperature of the module.

[0289] It is understandable that when the second temperature control module includes a second heating body, and the liquid medium in the tank cavity is cooled by the second heating body, the first and second adjustment methods can be adopted.

[0290] When the second temperature control module includes a refrigeration cavity, and the liquid medium in the tank cavity is cooled by the refrigeration cavity, the third and fourth adjustment methods can be used.

[0291] In the embodiment of the present application, when the current temperature of the liquid medium in the tank cavity reaches the target temperature, the module expected temperature of the second temperature control module can be adjusted immediately according to the output power and target power range of the first temperature control module. The output power and target power range of the first temperature control module can also be obtained in real time when the control moment of the second temperature control module is reached, and the module expected temperature of the second temperature control module can be adjusted accordingly. By comparing the current temperature of the first temperature control module with the module expected temperature, the output power of the second temperature control module is adjusted so that the current temperature of the second temperature control module reaches the module expected temperature. Therefore, when environmental factors and other factors cause a large disturbance to the liquid medium in the tank cavity, and the output power of the first temperature control module exceeds the adjustment capacity, the module expected temperature of the second temperature control module can be adjusted to adjust the output power of the second temperature control module so that the current temperature of the liquid medium in the tank cavity can be stabilized at the target temperature, thereby ensuring the accuracy of the temperature verification result.

[0292] In some examples, the temperature control method further includes: controlling the output power of the second temperature control module, which may specifically include the following steps:

[0293] S305, adjusting the desired module temperature of the second temperature control module according to the current temperature of the liquid medium in the tank cavity and the target temperature; wherein, T R2 =T T +K(T T -T1)+b,T R2 is the expected module temperature, T T is the target temperature, T1 is the current temperature of the liquid medium in the tank cavity, K is the first compensation parameter, and b is the second compensation parameter.

[0294] It is understandable that K and b are supplementary parameters preset by the control module. By comparing the current temperature T1 of the liquid medium in the tank with the target temperature T T By applying the above formula, we can get the expected module temperature T R2 .

[0295] Among them, K can be adjusted during the temperature control process of the temperature control component, and the larger K is, the more aggressive the temperature control strategy of the entire constant temperature liquid tank is. For example, the greater the output power of the second temperature control module is, the more the temperature control amplitude of the liquid medium in the tank cavity is increased; the smaller K is, the more conservative the temperature control strategy of the entire constant temperature liquid tank is. For example, the smaller the output power of the second temperature control module is, the less the temperature control amplitude of the liquid medium in the tank cavity is reduced.

[0296] For example, the target temperature is 200°C, and the current temperature of the liquid medium in the tank cavity is 100°C. If K=1 and b=10, the expected module temperature is 310°C. If K=2 and b=10, the expected module temperature is 410°C. Compared with the case of K=1, the expected module temperature corresponding to K=2 is higher. To achieve this expected module temperature, the second temperature control module needs to have a larger output power. Correspondingly, the exchange efficiency between the first side wall and the liquid medium in the tank cavity is higher, and the heating rate of the liquid medium in the tank cavity is faster.

[0297] In some examples, the absolute value of the difference between the current temperature of the liquid medium in the tank and the target temperature, i.e., |T T -T1| determines the size of the K value.

[0298] For example, when the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature (ie |T T When the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature is less than or equal to the temperature difference threshold, the first compensation parameter K=k1 is determined, and |k1|>|k2|. It will be understood that the temperature threshold is a parameter preset by the control module and can be specifically determined based on the difference between the target temperature value and the ambient temperature.

[0299] Among them, |T T-T1| is greater than the temperature difference threshold, which can be understood as a large temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature. For example, T1 is greater than T T , that is, the current temperature of the liquid medium in the tank cavity is greater than the target temperature, and the temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature is large; for another example, T1 is less than T T , that is, the current temperature of the liquid medium in the tank cavity is lower than the target temperature, and the temperature difference between the target temperature and the current temperature of the liquid medium in the tank cavity is large.

[0300] |T T -T1| is less than or equal to the temperature difference threshold, which can be understood as the temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature is small. For example, T1 is greater than T T , that is, the current temperature of the liquid medium in the tank cavity is greater than the target temperature, and the current temperature of the liquid medium in the tank cavity is near the target temperature; for another example, T1 is less than T T , that is, the current temperature of the liquid medium in the tank cavity is lower than the target temperature, and the current temperature of the liquid medium in the tank cavity is near the target temperature.

[0301] Among them, |T T The larger -T1| is, the greater the temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature is, the larger K is, and the higher the expected module temperature of the second temperature control module is. Therefore, by making a larger adjustment to the output power of the second temperature control module, the current temperature of the second temperature control module can be greatly changed, so as to significantly adjust the current temperature of the liquid medium in the tank cavity and quickly reach the target temperature.

[0302] |T T The smaller -T1| is, the smaller the temperature difference between the current temperature of the liquid medium in the tank cavity and the target temperature is, the smaller K is, and the lower the expected module temperature of the second temperature control module is. Therefore, the output power of the second temperature control module can be slightly adjusted or maintained unchanged, so that the current temperature of the second temperature control module changes slightly or remains unchanged, thereby fine-tuning the current temperature of the liquid medium in the tank cavity and stabilizing it at the target temperature.

[0303] For example, the target temperature is 200°C, the aforementioned temperature difference threshold is 100°C, b=10, and when the current temperature of the liquid medium in the tank cavity is 50°C, |T T -T1|>100, corresponding k1=2, based on which the desired module temperature is 510℃. Afterwards, when the temperature of the liquid medium in the tank cavity reaches 150℃, |T T-T1|<100, corresponding to k1=1, and the desired module temperature is 260℃. Compared with the case where the liquid medium in the tank cavity reaches 150℃, the desired module temperature corresponding to the liquid medium in the tank cavity at 50℃ is higher. To achieve this desired module temperature, the second temperature control module needs to have a larger output power. Correspondingly, the exchange efficiency between the first side wall and the liquid medium in the tank cavity is higher, and the heating rate of the liquid medium in the tank cavity is faster. Through this design, the temperature can be quickly increased or decreased in the initial stage of heating or cooling, and the target temperature can be approached with a smaller temperature change rate when approaching the target temperature, thereby reducing the risk of temperature overshoot. In addition, b can be adjusted during the temperature control process of the temperature control component, and when |T T -T1| is less than the temperature threshold, for example, equal to zero, that is, when the liquid medium in the tank cavity reaches the target temperature or is near the target temperature, b has a greater impact on the temperature of the liquid medium in the tank cavity. That is, it is particularly important to determine a suitable b so that when the current temperature of the second temperature control module reaches the expected temperature of the module, the liquid medium in the tank cavity can be adjusted to the target temperature.

[0304] It can be understood that b represents the amplitude of the disturbance caused by the environment to the liquid medium in the tank cavity. The greater the absolute value of the difference between the ambient temperature and the target temperature, the greater b is. That is, it is necessary to increase the expected module temperature of the second temperature control module to significantly adjust the current temperature of the second temperature control module, so that the second temperature control module absorbs the continuous disturbance caused by the environment to the temperature of the liquid medium in the tank cavity, ensuring that the liquid medium in the tank cavity quickly reaches and stabilizes at the target temperature.

[0305] The smaller b is, the more necessary it is to reduce or maintain the desired module temperature of the second temperature control module in order to fine-tune or maintain the current temperature of the second temperature control module, so that the second temperature control module can fine-tune or maintain the current temperature or output power to ensure that the temporary fluctuation of the temperature of the liquid medium in the tank cavity is basically regulated by the first temperature control module under relatively small disturbances in the environment.

[0306] S306 , obtaining the current temperature of the second temperature control module, and controlling the output power of the second temperature control module according to the module desired temperature and the current temperature of the second temperature control module, so that the current temperature of the second temperature control module reaches the module desired temperature.

[0307] For example, after the module desired temperature of the second temperature control module is adjusted according to the current temperature and target temperature of the liquid medium in the tank cavity, the output power of the second temperature control module can be controlled so that the current temperature of the second temperature control module reaches the module desired temperature, thereby ensuring the cooperation of the second temperature control module and the first temperature control module, so that the liquid medium in the tank cavity can reach and stabilize at the target temperature.

[0308] It should be noted that the process of obtaining the current temperature of the second temperature control module and controlling the output power of the second temperature control module according to the expected module temperature and the current temperature of the second temperature control module can refer to the relevant content of S3042 above and will not be repeated here.

[0309] The embodiment of the present application is based on T R2 =T T +K(T T -T1)+b is used to first adjust the desired module temperature of the second temperature control module, and then control the output power of the second temperature control module based on the desired module temperature and the current temperature of the second temperature control module. Because the above formula takes into account the difference between the current temperature and the target temperature of the liquid medium in the tank cavity, as well as environmental factors, appropriate K and b are determined. When the current temperature of the second temperature control module reaches the desired module temperature, the temperature of the liquid medium in the tank cavity can accurately reach the target temperature, thereby improving the temperature control accuracy of the constant temperature liquid tank.

[0310] It should be noted that the above-mentioned control method for the output power of the second temperature control module is applicable to the heating or cooling process when the liquid medium in the tank cavity has not yet reached the target temperature, and is also applicable to the control process when the liquid medium in the tank cavity reaches the target temperature.

[0311] In some examples, while controlling the output power of the second temperature control module based on the desired module temperature and the current temperature of the second temperature control module, the first temperature control module also continues to work. Through the joint cooperation of the first temperature control module and the second temperature control module, the liquid medium in the tank cavity can reach the target temperature.

[0312] When the output power of the first temperature control module has exceeded the target power range, that is, the first temperature control module can exceed the adjustment capacity of the current control cycle, it is necessary to continue to adjust the output power of the second temperature control module to make the liquid medium in the tank cavity reach the target temperature.

[0313] For example, if the expected temperature of the second temperature control module is higher than the target temperature, that is, during the heating process of the liquid medium in the tank cavity, when the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the second compensation parameter b can be increased to increase the expected temperature of the module, that is, when the heating power of the first temperature control module is greater than or equal to the upper limit value of the target power range, for example, greater than or equal to the maximum heating power of the first temperature control module, the second compensation parameter b can be increased to increase the expected temperature of the module.

[0314] For example, when the temperature of the liquid medium in the tank cavity is lower than the target temperature, and the heating power of the first temperature control module is greater than or equal to the upper limit of the target power range, it indicates that the first temperature control module can no longer raise the current temperature of the liquid medium in the tank cavity to the target temperature. At the same time, the current output power of the second temperature control module does not control the current temperature of the liquid medium in the tank cavity at the target temperature. The second compensation parameter b can be increased to increase the expected temperature of the module so that the expected temperature of the module is higher than the current temperature of the second temperature control module. By increasing the heating power of the second temperature control module, the current temperature of the second temperature control module reaches the expected temperature of the module, thereby making the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0315] When the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the second compensation parameter b can be reduced to lower the expected temperature of the module. That is, when the heating power of the first temperature control module is less than or equal to the lower limit of the target power range, for example, less than or equal to the minimum heating power of the first temperature control module, the second compensation parameter b can be reduced to lower the expected temperature of the module.

[0316] For example, when the temperature of the liquid medium in the tank cavity is greater than the target temperature, and the heating power of the first temperature control module is less than or equal to the lower limit of the target power range, it indicates that the first temperature control module can no longer reduce the current temperature of the liquid medium in the tank cavity to the target temperature. At the same time, the current output power of the second temperature control module does not control the current temperature of the liquid medium in the tank cavity at the target temperature. The second compensation parameter b can be reduced to reduce the expected temperature of the module so that the current temperature of the second temperature control module is higher than the expected temperature of the module. By reducing the heating power of the second temperature control module, the current temperature of the second temperature control module reaches the expected temperature of the module, thereby making the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0317] For another example, if the expected temperature of the second temperature control module is lower than the target temperature, that is, during the cooling process of the liquid medium in the tank cavity, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the second compensation parameter b can be reduced to lower the expected temperature of the module, that is, when the cooling thermal power of the first temperature control module is greater than or equal to the upper limit of the target power range, for example, greater than or equal to the maximum cooling power of the first temperature control module, the second compensation parameter b can be reduced to lower the expected temperature of the module.

[0318] For example, when the temperature of the liquid medium in the tank cavity is greater than the target temperature, and the cooling power of the first temperature control module is greater than or equal to the upper limit of the target power range, it indicates that the first temperature control module can no longer reduce the current temperature of the liquid medium in the tank cavity to the target temperature. At the same time, the current output power of the second temperature control module does not control the current temperature of the liquid medium in the tank cavity at the target temperature. The second compensation parameter b can be reduced to reduce the expected temperature of the module so that the expected temperature of the module is lower than the current temperature of the second temperature control module. The cooling power of the second temperature control module can be increased so that the current temperature of the second temperature control module reaches the expected temperature of the module, thereby making the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0319] When the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the second compensation parameter b can be increased to increase the desired module temperature. That is, when the cooling power of the first temperature control module is less than or equal to the lower limit of the target power range, for example, less than or equal to the minimum cooling power of the first temperature control module, the second compensation parameter b can be increased to increase the desired module temperature.

[0320] For example, when the temperature of the liquid medium in the tank cavity is lower than the target temperature, and the cooling power of the first temperature control module is less than or equal to the lower limit of the target power range, it indicates that the first temperature control module can no longer raise the current temperature of the liquid medium in the tank cavity to the target temperature. At the same time, the current output power of the second temperature control module does not control the current temperature of the liquid medium in the tank cavity at the target temperature. The second compensation parameter b can be increased to increase the expected temperature of the module, so that the current temperature of the second temperature control module is lower than the expected temperature of the module. The cooling power of the second temperature control module is reduced so that the current temperature of the second temperature control module reaches the expected temperature of the module, thereby making the current temperature of the liquid medium in the tank cavity reach the target temperature.

[0321] In the embodiment of the present application, when the output power of the first temperature control module exceeds the target power range, the second compensation parameter b is adjusted. That is, when the first temperature control module exceeds the temperature control capacity, the output power of the second temperature control module is adjusted by adjusting the module expected temperature of the second temperature control module, so that the liquid medium in the tank cavity transfers heat through the first side wall and is adjusted to the target temperature. Conversely, when the output power of the first temperature control module is within the target power range, the second compensation parameter b remains unchanged, that is, the output power of the second temperature control module is maintained at the current power. It is only necessary to adjust the output power of the first temperature control module according to the current temperature of the liquid medium in the tank cavity to quickly and accurately adjust the current temperature of the liquid medium in the tank cavity to the target temperature, thereby improving the temperature regulation efficiency and accuracy of the constant temperature liquid tank.

[0322] In some examples, the control period of the first temperature control module is shorter than the control period of the second temperature control module.

[0323] It can be understood that the first temperature control module is arranged in the tank cavity and can quickly respond to the temperature fluctuations of the liquid medium in the tank cavity, while the second temperature control module is arranged outside the tank cavity and connected to the outer surface of the first side wall, so that the second temperature control module needs to transfer the heat or cooling capacity to the liquid medium in the tank cavity through the first side wall. Therefore, by setting the control period of the first temperature control module to be smaller than the control period of the second temperature control module, the first temperature control module plays a leading role in the entire temperature control process. For example, when adjusting the liquid medium in the tank cavity from the initial temperature to the target temperature, by adjusting the output power of the first temperature control module and keeping the output power of the second temperature control module unchanged, the current temperature of the liquid medium in the tank cavity is quickly adjusted to the target temperature to improve the temperature control efficiency. When the temperature of the liquid medium in the tank cavity fluctuates greatly due to environmental factors and the first temperature control module is unable to absorb the fluctuation, the temperature of the liquid medium in the tank cavity can be adjusted by adjusting the output power of the second temperature control module so that the liquid medium in the tank cavity is stabilized at the target temperature. That is, the second temperature control module plays the role of assisting the first temperature control module, thereby improving the temperature accuracy and stability of the liquid medium in the tank cavity when the environmental disturbance is large.

[0324] In some examples, the output power of the first temperature control module is less than the output power of the second temperature control module. Because the second temperature control module is arranged outside the tank cavity, the second temperature control module needs to transfer the heat or cooling capacity to the liquid medium in the tank cavity through the first side wall. The first temperature control module is arranged in the tank cavity and can directly exchange heat with the liquid medium in the tank cavity. Therefore, the output power of the first temperature control module can be less than the output power of the second temperature control module. On the one hand, improving the temperature control efficiency of the temperature control component, such as the second temperature control module, on the liquid medium in the tank cavity can reduce the power consumption of the first temperature control module and the probability of exceeding the target power range. On the other hand, when the output power of the second temperature control module is high, the presence of the first side wall can also alleviate the risk of overheating or overcooling of the liquid medium.

[0325] For example, when the first temperature control module includes a first heating element and the second temperature control module includes a second heating element, the heating power of the second heating element may be greater than the heating power of the first heating element. When the first temperature control module includes a first cooling element (e.g., a combination of a cooling chamber and a cooling compressor) and the second temperature control module includes a second cooling element, the cooling power of the second cooling element may be greater than the cooling power of the first heating element.

[0326] In some examples, the second temperature control module includes a heating body (eg, a second heating body) and a refrigeration cavity, and the refrigeration cavity is connected to a refrigeration compressor so that the refrigerant circulates between the refrigeration cavity and the refrigeration compressor.

[0327] In the above example, adjusting the output power of the second temperature control module may include: adjusting the output power of the heating body and the output power of the refrigeration compressor to adjust the amount of heat or cold transferred by the second temperature control module to the first side wall.

[0328] Among them, due to the influence of factors such as the change in the amount of refrigerant in the refrigeration compressor, the different opening degrees of the expansion valve, and the blockage degree of the expansion valve port filter, the output power of the refrigeration compressor will not match the current temperature of the final second temperature control module, thereby affecting the temperature control accuracy of the refrigeration chamber on the liquid medium in the tank cavity. The heating body, such as the ceramic heating tube, has a relatively good match with the output power of the ceramic heating tube. Therefore, the control period of the heating body, such as the second heating body, can be set to be less than the control period of the second temperature control module, and the control period of the refrigeration compressor is greater than the control period of the second temperature control module, that is, the output power of the second heating body is adjusted first to accurately adjust the current temperature of the liquid medium in the tank cavity, thereby improving the temperature control accuracy of the second temperature control module on the liquid medium in the tank cavity.

[0329] For example, when determining that the heating power of the second temperature control module needs to be increased or the cooling power needs to be reduced, it is possible to first determine whether there is room for improvement in the second heating body, that is, whether the output power of the second heating body is less than the rated power of the second heating body. If it is less than, first increase the heating power of the second heating body and keep the output power of the refrigeration compressor unchanged. If it is greater than or equal to, reduce the output power of the refrigeration compressor, that is, give priority to adjusting the heating power of the second heating body.

[0330] For another example, when determining that the heating power of the second temperature control module needs to be reduced or the cooling power needs to be increased, it is possible to first determine whether there is room for reduction in the second heating body, that is, whether the output power of the second heating body is greater than the minimum power of the second heating body. If it is greater, the heating power of the second heating body is reduced first, and the output power of the refrigeration compressor is kept unchanged. If it is less than or equal to, the output power of the refrigeration compressor is increased, that is, the heating power of the second heating body is adjusted first.

[0331] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A constant temperature liquid tank, characterized in that: include: A tank body, for containing a liquid medium, the tank body comprising a first side wall and a second side wall opposite to each other, wherein a tank cavity is formed between the first side wall and the second side wall; A guide baffle is provided in the tank cavity, a stirring zone is provided between the guide baffle and the first side wall, a working zone is provided between the guide baffle and the second side wall, the working zone is used to place the instrument to be tested, and a guide hole is provided on the guide baffle; a temperature control assembly, comprising a first temperature control module and a second temperature control module, wherein the first temperature control module is disposed in the stirring zone and is used to heat or cool the liquid medium in the stirring zone; and the second temperature control module is disposed outside the tank body and located on the first side wall and is used to heat or cool the first side wall; A stirring impeller is arranged in the stirring zone, and the stirring impeller rotates in a directional manner so that the liquid medium in the stirring zone exchanges heat with the first temperature control module and the first side wall, and mixes in the stirring zone and flows to the working area through the guide hole.

2. The constant temperature liquid tank according to claim 1, characterized in that The tank body further includes a third side wall connected between the first side wall and the second side wall, a fourth side wall disposed opposite to the third side wall, and a bottom wall, wherein the first side wall, the second side wall, the third side wall, the fourth side wall, and the bottom wall enclose the tank cavity; The bottom wall includes a first part and a second part connected to each other, the first part is connected to the first side wall, the second part is connected to the second side wall, an obtuse angle is formed between the inner side surface of the first part and the inner side surface of the first side wall, and an obtuse angle is formed between the inner side surface of the first part and the inner side surface of the second part.

3. The constant temperature liquid tank according to claim 2, characterized in that The first portion is at least partially located between the guide baffle and the first side wall, and an upper edge of the first portion is higher than a lower edge of the guide baffle; The stirring impeller is located above the first portion, and the distance between the stirring impeller and the first portion is greater than the distance between the upper edge of the guide baffle and the stirring impeller; The guide holes are distributed on the guide baffle at intervals along the up-down direction.

4. The constant temperature liquid tank according to claim 1, characterized in that Both ends of the guide baffle converge toward the first side wall, and the distance between one end of the guide baffle and the first side wall is smaller than the distance between the middle of the guide baffle and the first side wall.

5. The constant temperature liquid tank according to claim 1 or 4, characterized in that: The guide baffle includes a first guide baffle, a second guide baffle and a third guide baffle, one end of the first guide baffle is connected to the second guide baffle, the other end of the first guide baffle is connected to the third guide baffle, an obtuse angle is formed between the first guide baffle and the second guide baffle, and an obtuse angle is formed between the first guide baffle and the third guide baffle, with the opening facing the stirring zone.

6. The constant temperature liquid tank according to claim 5, characterized in that A first guide hole is provided on the first guide plate, so that the liquid medium in the stirring zone flows to the working zone through the first guide hole close to the second guide plate, and the liquid medium in the working zone flows to the stirring zone through the first guide hole close to the third guide plate; The second flow guide plate is a non-porous plate, so that the liquid medium in the stirring zone is blocked by the second flow guide plate when flowing toward the working zone; A guide gap is provided between the second guide plate and the first side wall, so that the liquid medium in the stirring zone flows to the working zone through the guide gap; The third guide plate is provided with a third guide hole, so that the liquid medium in the working area flows to the stirring area through the third guide hole.

7. The constant temperature liquid tank according to claim 6, characterized in that The constant temperature liquid tank further includes a temperature measuring element, which is used to measure the temperature of the liquid medium. The temperature measuring element is connected to the first guide plate, or the temperature measuring element is connected to the third guide plate.

8. The constant temperature liquid tank according to claim 1, characterized in that It also includes a guide fixing portion arranged above the trough body, the guide fixing portion is connected to the guide baffle through a guide fixing column, the radial cross-sectional area of ​​the guide fixing column is smaller than the radial cross-sectional area of ​​the guide baffle, and the guide baffle does not contact the inner side of the trough body.

9. The constant temperature liquid tank according to claim 1, characterized in that The second temperature control module includes a temperature averaging plate, and the temperature averaging plate is attached to the first side wall; The second temperature control module further includes at least one of a refrigeration chamber and a heating body; The refrigeration cavity is arranged in the temperature equalizing plate, and the refrigeration cavity is connected to the refrigeration compressor so that the refrigerant circulates between the refrigeration cavity and the refrigeration compressor; The heating body is arranged in the temperature averaging plate, or the heating body is attached to the temperature averaging plate.

10. The constant temperature liquid tank according to claim 9, characterized in that The distance between the refrigeration cavity and the first side wall is smaller than the distance between the heating body and the first side wall.

11. The constant temperature liquid tank according to claim 1, characterized in that The constant temperature liquid tank further includes a thermal insulation layer, which wraps the second temperature control module and the outer side of the tank body.

12. The constant temperature liquid tank according to claim 11, characterized in that The second temperature control module includes a refrigeration cavity, which is connected to a refrigeration compressor so that a refrigerant circulates between the refrigeration cavity and the refrigeration compressor. The insulation layer is attached to the second temperature control module and the outer side of the tank body.

13. The constant temperature liquid tank according to claim 11, characterized in that The second temperature control module includes a heating body, the insulation layer is attached to the second side wall, a heat dissipation duct is formed between the bottom wall of the constant temperature liquid tank and the insulation layer, and the outlet of the heat dissipation duct is switchably arranged on the surface of the constant temperature liquid tank.

14. The constant temperature liquid tank according to any one of claims 1-4 and 6-13, characterized in that: The distance between the first temperature control module and the first side wall is smaller than the distance between the stirring impeller and the first side wall; and there is a gap between the first temperature control module and the first side wall.

15. The constant temperature liquid tank according to any one of claims 1-4 and 6-13, characterized in that: The constant temperature liquid tank includes a liquid storage tank and a liquid discharge pipe, and the liquid storage tank is arranged outside the shell of the constant temperature liquid tank; One end of the liquid drain pipe is communicated with the liquid storage tank, and the other end of the liquid drain pipe is communicated with the upper part of the tank cavity.

16. The constant temperature liquid tank according to any one of claims 1-4 and 6-13, characterized in that: The rated power of the first temperature control module is less than the rated power of the second temperature control module.

17. A method for controlling the temperature of a constant temperature liquid tank, characterized in that: The constant temperature liquid tank includes a tank body, a guide baffle, a temperature control component and a stirring impeller. The tank body includes a first side wall and a second side wall opposite to each other, a tank cavity is formed between the first side wall and the second side wall, the guide baffle is arranged in the tank cavity, a stirring area is provided between the guide baffle and the first side wall, a working area is provided between the guide baffle and the second side wall, the working area is used to place the instrument to be measured, a guide hole is provided on the guide baffle, the temperature control component is composed of a first temperature control module and a second temperature control module, the first temperature control module is provided in the stirring area, the second temperature control module is provided on the outside of the tank body and located on the first side wall, and the stirring impeller is provided in the stirring area; the temperature control method includes: Obtaining a target power range of the first temperature control module; Obtaining a target temperature and a current temperature of the liquid medium in the tank cavity; controlling the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity; The output power of the second temperature control module is controlled according to the output power of the first temperature control module and the target power range.

18. The temperature control method according to claim 17, characterized in that: The controlling the output power of the second temperature control module according to the output power of the first temperature control module and the target power range includes: If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, the module expected temperature of the second temperature control module is adjusted according to the output power of the first temperature control module and the target power range; wherein, if the module expected temperature is lower than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the module expected temperature is lowered; when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the module expected temperature is increased; if the module expected temperature is higher than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit of the target power range, the module expected temperature is increased; when the output power of the first temperature control module is less than or equal to the lower limit of the target power range, the module expected temperature is lowered; The current temperature of the second temperature control module is obtained, and the output power of the second temperature control module is controlled according to the desired module temperature and the current temperature of the second temperature control module so that the current temperature of the second temperature control module reaches the desired module temperature.

19. The temperature control method according to claim 17, wherein: The temperature control method further comprises: According to the current temperature of the liquid medium in the tank cavity and the target temperature, the module desired temperature of the second temperature control module is adjusted; wherein, T R2 =T T +K(T T -T1)+b,T R2 is the desired temperature of the module, T T is the target temperature, T1 is the current temperature of the liquid medium in the tank cavity, K is the first compensation parameter, b is the second compensation parameter, if the target temperature is higher than the ambient temperature, then K>0, b>0; if the target temperature is lower than the ambient temperature, then K<0, b<0; The current temperature of the second temperature control module is obtained, and the output power of the second temperature control module is controlled according to the desired module temperature and the current temperature of the second temperature control module so that the current temperature of the second temperature control module reaches the desired module temperature.

20. The temperature control method according to claim 19, wherein: If the expected temperature of the module is higher than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the second compensation parameter b is increased; when the output power of the first temperature control module is less than or equal to the lower limit value of the target power range, the second compensation parameter b is reduced; if the expected temperature of the module is lower than the target temperature, when the output power of the first temperature control module is greater than or equal to the upper limit value of the target power range, the second compensation parameter b is reduced; when the output power of the first temperature control module is less than or equal to the lower limit value of the target power range, the second compensation parameter b is increased.

21. The temperature control method according to claim 19, wherein: When the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature is greater than the temperature difference threshold, the first compensation parameter K=k1 is determined; when the absolute value of the difference between the current temperature of the liquid medium in the tank cavity and the target temperature is less than or equal to the temperature difference threshold, the first compensation parameter K=k2 is determined, |k1|>|k2|.

22. The temperature control method according to claim 17, wherein: The second temperature control module includes a heating body and a refrigeration cavity, wherein the refrigeration cavity is connected to a refrigeration compressor so that a refrigerant circulates between the refrigeration cavity and the refrigeration compressor; The controlling of the output power of the second temperature control module includes: periodically controlling the output power of the heating body, wherein the control period of the heating body is less than the control period of the second temperature control module; and periodically controlling the output power of the refrigeration compressor, wherein the control period of the refrigeration compressor is greater than the control period of the second temperature control module.

23. The temperature control method according to any one of claims 17 to 22, characterized in that: The constant temperature liquid tank further includes a first temperature measuring element, which is disposed in the tank cavity; obtaining the target temperature and the current temperature of the liquid medium in the tank cavity includes obtaining measurement information from the first temperature measuring element and determining the current temperature of the liquid medium in the tank cavity based on the measurement information of the first temperature measuring element; The constant temperature liquid tank also includes a second temperature measuring element, which is connected to the second temperature control module; the temperature control method also includes obtaining measurement information from the second temperature measuring element and determining the current temperature of the second temperature control module based on the measurement information of the second temperature measuring element.

24. The temperature control method according to any one of claims 17 to 22, characterized in that: Periodically controlling the output power of the first temperature control module and periodically controlling the output power of the second temperature control module; The control period of the first temperature control module is shorter than the control period of the second temperature control module; The output power of the first temperature control module is less than the output power of the second temperature control module.

25. The temperature control method according to any one of claims 17 to 22, characterized in that: The controlling the output power of the first temperature control module according to the target temperature and the current temperature of the liquid medium in the tank cavity includes: If the current temperature of the liquid medium in the tank cavity is higher than the target temperature, reducing the heating power of the first temperature control module, or controlling the first temperature control module to reach a minimum heating power, or increasing the cooling power of the first temperature control module, or controlling the first temperature control module to reach a maximum cooling power; If the current temperature of the liquid medium in the tank cavity is lower than the target temperature, the heating power of the first temperature control module is increased, or the first temperature control module is controlled to reach a maximum heating power, or the cooling power of the first temperature control module is reduced, or the first temperature control module is controlled to reach a minimum cooling power; If the current temperature of the liquid medium in the tank cavity is equal to the target temperature, the current output power of the first temperature control module is kept unchanged.

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