Constant-temperature liquid tank and temperature control method thereof

Abstract

The embodiment of the invention provides a constant-temperature liquid bath and a temperature control method thereof, and the constant-temperature liquid bath comprises a bath body which is provided with a first side wall and a second side wall which are opposite; the flow guide partition plate is arranged in the groove cavity of the groove body, a stirring area is arranged between the flow guide partition plate and the first side wall, a working area is arranged between the flow guide partition plate and the second side wall, the working area is used for placing an instrument to be tested, and flow guide holes are formed in the flow guide partition plate; 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 area and used for heating or refrigerating a liquid medium in the stirring area, and the second temperature control module is arranged on the outer side of the tank body and located on the first side wall; the second temperature control module is used for heating or refrigerating the first side wall; the stirring impeller is arranged in the stirring area and rotates directionally, so that a liquid medium in the stirring area exchanges heat with the first temperature control module and the first side wall, is mixed in the stirring area and flows to the working area through the flow 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 liquid medium is formed inside 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 as to detect the instrument to be tested.

[0003] In a related technology, in order to make the liquid medium in the tank cavity evenly heated, 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 working efficiency of temperature detection. Summary of the invention

[0004] The embodiment of the present application provides a constant temperature liquid tank and a temperature control method thereof, which can improve the uniformity of the temperature field 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 comprises 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 flow guide baffle is arranged in the groove cavity, a stirring zone is arranged between the flow guide baffle and the first side wall, a working zone is arranged between the flow guide baffle and the second side wall, the working zone is used to place the instrument to be tested, and a flow guide hole is arranged on the flow 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 the first temperature control module 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 located on the first side wall, and 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 embodiment of the present application provides a constant temperature liquid tank, by setting a guide baffle in the tank body, setting a working area between the guide baffle and the second side wall, so that the instrument to be tested is placed in the working area, setting a stirring area between the guide baffle and the first side wall, and setting a stirring impeller in the stirring area, and setting a first temperature control module in the stirring area, the first temperature control module is used to perform heat exchange with the liquid medium in the stirring area, and the second temperature control module is set 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 between 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 performed in the stirring area, and can flow to the working area through the guide hole on the guide baffle. Compared with the temperature control module symmetrically set on the outer wall of the tank body in the related art, the embodiment of the present application 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 thus improve the temperature calibration efficiency of the instrument to be calibrated.

[0011] In some implementations, 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, and the first side wall, the second side wall, the third side wall, the fourth side wall 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 the bottom of the working area.

[0014] In some implementations, at least part of the first portion is located between the guide baffle and the first side wall, and the upper edge of the first portion is higher than the 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 spaced apart on the guide baffle along the up and down directions.

[0015] In the 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 area, thereby improving the uniformity of the temperature field in the middle of the working area. 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 area to the working area. The closer to the bottom wall, the smaller the flow trend generated by the stirring impeller, thereby improving the uniformity of the temperature field in the middle and lower parts of the working area. When reaching the first part of the bottom wall, the liquid medium flows from the stirring area to the working area 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, 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.

[0020] The embodiment of the present application can reduce the spatial size of the stirring zone and improve the barrier effect on the liquid medium through the structural design of the guide baffle, thereby improving 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 plate, so that it flows in the direction of the first guide plate and the guide gap respectively. The longer flow path can improve the mixing effect. A part of the liquid medium flows from the stirring zone 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, so as to realize the small-scale circulation of the liquid medium near the first guide plate. Another part 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, so as to realize the large-scale circulation of the liquid medium in the entire tank cavity. Due to the structural difference between the first guide 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 uniformity of the temperature field 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 flow guide plate, or the temperature measuring element is connected to the third flow guide plate.

[0024] In the 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-range 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-range 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, 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 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 thermal 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, thereby reducing the temperature fluctuation caused by the fluctuation of the cooling capacity, improving the temperature control stability of the second temperature control module, and then the control accuracy of the second temperature control module can be improved.

[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 fluctuation of 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 a thermal 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, thereby improving the uniformity of the temperature field in the tank cavity.

[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 box and a drain pipe, wherein the liquid storage box is disposed outside the shell of the constant temperature liquid tank; one end of the drain pipe is connected to the liquid storage box, 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, thereby 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 allocating power to 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 comprises a tank body, a guide baffle, a temperature control component and a stirring impeller, the tank body comprises 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 a meter to be tested, a guide hole is arranged on the guide baffle, the temperature control component consists 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 on the outside of the tank body and located on the first side wall, and the stirring impeller is arranged in the stirring zone; the temperature control method comprises:

[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 output power of the temperature control component under the current working condition 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. This 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 also adjust the second temperature control module according to the current working condition, so as to meet the total demand of the current working condition for the output power of the temperature control component, thereby improving the uniformity of the temperature field 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 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, 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 expected 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 expected 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, adjust the expected temperature of the module accordingly, and make the second temperature control module reach the expected temperature of the module by adjusting the output power of the second temperature control module, and then adjust the heating or cooling capacity of the second temperature control module according to actual needs; in addition, if the expected temperature of the module 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 expected temperature of the module 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 expected temperature of the module 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 module 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 expected 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 expected temperature.

[0057] The present application embodiment is based on T R2 =T T +K(T T -T1)+b is used to adjust the expected module 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 respectively. When the medium temperature in the tank cavity is greatly different from the target temperature, the expected module temperature is also greatly different from the target temperature. 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 medium temperature in the tank cavity is less different from the target temperature, the expected module temperature is also less different from the target temperature. 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 over-adjustment of the constant temperature liquid tank, reducing temperature fluctuations caused by over-adjustment, 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 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 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 of the target power range, the second compensation parameter b is increased.

[0060] The 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 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 slot 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 slot 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, by increasing K, the temperature difference between the module's expected temperature and the liquid medium in the tank cavity can be increased, so as to increase the heating or cooling capacity provided by the second temperature control module to the liquid medium in the tank cavity, so that it can change to the target temperature more quickly, thereby improving the temperature detection efficiency. |T T When -T1| is small, K can be reduced, which can reduce the temperature difference between the expected temperature of the module and the liquid medium in the tank cavity, thereby reducing the heating or cooling amount 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 over-adjustment 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 performs a refrigeration cycle 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 smaller 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 larger 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 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 also 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, including obtaining measurement information from the first temperature measuring element, and determining the current temperature of the liquid medium in the tank cavity according to 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 according to 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 the 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, thereby reducing the control influence 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 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.

[0073] In some implementations, 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, including: 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying any creative work.

[0078] Figure 1 It 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 A longitudinal cross-sectional view of a constant temperature liquid tank provided in an embodiment of the present application Figure 1 ;

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

[0081] Figure 4 A longitudinal cross-sectional view of a constant temperature liquid tank provided in an 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 schematic diagram of the structure of a guide baffle provided in one embodiment of the present application.

[0084] Description of reference numerals:

[0085] 10-shell; 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 shell; 12-second shell; 13-third shell; 14-bottom shell; 21-first side wall; 22-second side wall; 23-bottom wall; 24-slot cavity; 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 guide plate; 42-second guide plate; 43-third guide plate; 44-guide hole; 45-guide fixing column; 51-stirring impeller; 52-driving rod; 53-stirring motor; 54-stirring mounting part; 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 the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present 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 may 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 the present application, it should be understood that the terms "upper", "lower", "horizontal", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application. In the present application, unless otherwise clearly specified and limited, a first feature being "upper" or "lower" than a second feature may be when the first and second features are in direct contact, or when the first and second features are in indirect contact through an intermediate medium.

[0091] In this application, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. However, if it is indicated as a direct connection, it means that the two connected entities are not connected through an intermediate structure, but are only connected to form a whole through a connecting structure. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0092] In this application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

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

[0094] In some examples, the slot body 20 is a box structure with an opening at the top. The liquid medium can be injected into the slot cavity 24 of the slot body 20 through the slot 25. The instrument to be tested extends into the liquid medium in the slot cavity 24 through the top opening of the slot body 20 to calibrate the temperature. 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, and 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, the first side wall 21 and the second side wall 22 are not in contact with each other.

[0096] It should be noted that the groove wall of the groove body 20 can be an arc structure, a rectangular parallelepiped, a cube or an irregular polyhedron. For example, the groove 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 5 faces (see Figures 1 to 3 As shown), for another 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, and 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, which is disposed in the tank cavity 24 of the tank body 20, and a stirring zone 241 is disposed between the flow guide baffle 40 and the first side wall 21, and a working zone 242 is disposed between the flow guide baffle 40 and the second side wall 22. The working zone 242 is used to place the instrument to be tested, and the instrument to be tested extends into the liquid medium of the working zone 242 for temperature calibration. In addition, a flow guide hole 44 is disposed on the flow guide baffle 40 to connect the working zone 242 and 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 slot cavity 24 of the slot 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 provided between the flow guide baffle 40 and the first side wall 21. In some examples, other components such as a net bag for holding the instrument to be tested may be provided between the flow guide baffle 40 and the second side wall 22. The first side wall 21 and the second side wall 22 are two opposite side walls of the same tank body, and the working area and the stirring area are two communicating parts in 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, and the temperature control component 30 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 zone 241, and the first temperature control module 31 is used to heat or cool the liquid medium in the stirring zone 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 being set 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 the temperature fluctuation 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 heating body. It should be noted that in order to distinguish it from the heating body mentioned in the second temperature control module 32 below, the heating body here may be referred to as a first heating body, and the first heating body is used to provide heating 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 on the outer side of 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 side wall 21 has a certain thickness, and at least part of the second temperature control module 32 is disposed within the first side wall 21, or at least part of the second temperature control module 32 is integrated with the first side wall 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 cavity 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 cavity 321 and the refrigeration compressor 33. For example, a circulation loop is formed between the refrigeration compressor 33 and the refrigeration cavity 321, so that the refrigerant circulates between the refrigeration compressor 33 and the refrigeration cavity 321. The temperature of the refrigerant input to the refrigeration cavity 321 is lower than the temperature of the refrigerant output from the refrigeration cavity 321, so that the first side wall 21 is cooled by 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, and then is compressed and pressurized by the refrigeration compressor 33 to change into high-pressure steam. Then, it is condensed by the condenser to dissipate heat and change into high-pressure liquid. It is reduced in pressure by the expander and changes into low-temperature, low-pressure liquid. Finally, it enters the refrigeration chamber 321 again for refrigeration, and the cycle continues as above.

[0114] In some examples, the second temperature control module 32 includes a heating body, such as a second heating body 322, and the second heating body 322 is used to heat the first side wall 21. The second heating body 322 may include, but is not limited to, a ceramic heater, an electric heating wire, or an electromagnetic heater, etc., and the embodiment of the present application does not limit the type of the second heating body 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 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 refrigeration, the heat transfer distance between the refrigeration cavity 321 and the first side wall 21 is reduced, and the temperature response rate is improved. In addition, when the refrigeration capacity of the refrigeration compressor fluctuates, the refrigeration 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 be used 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 then 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] Exemplarily, the temperature homogenizing plate 323 may be made of metal material 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, and 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 and rotating the stirring impeller 51 in a directional manner, the liquid medium in the stirring zone 241 can be driven to flow from top to bottom and rotate along with the rotation direction of the stirring impeller 51, so that the liquid medium can be mixed 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 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 in which the temperature control module is symmetrically set on the outer wall of the tank body 20, the uniformity of the temperature field 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 with arranging the second temperature control module 32 in the tank cavity 24, on the one hand, the risk of overheating or overcooling of the liquid medium near the second temperature control module 32 can be reduced, and accordingly, the second temperature control module 32 can use a larger power to provide heating or cooling, thereby improving the 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 uniformity of the temperature field in 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 slot can be opened first, and a sufficient amount of liquid medium can be injected into the slot 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 slot cavity 24 so that the temperature of the liquid medium in the slot 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] Exemplarily, since the second temperature control module 32 is arranged outside the tank cavity 24, the rated power of the second temperature control module 32 may be greater than the rated power of the first temperature control module 31. For example, the rated power of the second heating body 322 may 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, the risk of overheating or overcooling of the liquid medium can also be alleviated.

[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, the rapid mixing of the liquid medium in the stirring zone 241 can be achieved to quickly exchange heat with the first temperature control module 31 and the first side wall 21, thereby improving the temperature regulation efficiency. On the other hand, the risk of overheating or overcooling due to the long contact time of part of the liquid medium with the first temperature control module 31 or the first side wall 21 can be reduced.

[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, so that 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 uniformity of the temperature field in 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 also 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 that heat exchange occurs between the first temperature control module 31 and the first side wall 21, which affects 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 slot 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 slot 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, 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 uniformity of the temperature field 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, and 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, that is, the height direction of the slot body 20. During the verification 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 along the up and down directions. Thus, 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] In the specific setting, a plurality of guide holes 44 can be arranged at intervals 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 plurality of 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 the reasons of 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, 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. Correspondingly, 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. Correspondingly, 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 uniformity of the temperature field in the upper and lower directions.

[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 to flow toward the working area 242. During the process, a part of the liquid medium passes through the guide hole 44 to enter 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 close to the stirring impeller 51 directly flowing from the first part 231 to the working area 242 during the stirring of the liquid medium by the stirring impeller 51, and at the same time, increase the flow rate of the liquid medium colliding with the guide baffle 40 driven by the stirring impeller 51, 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, the other end of the first guide baffle 41 is connected to the third guide baffle 43, an obtuse angle is formed between the first guide baffle 41 and the second guide baffle 42, and an obtuse angle is formed between the first guide baffle 41 and the third guide baffle 43, with the opening 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 direction of the first side wall 21 to reduce the spatial size of the stirring zone 241.

[0152] In addition, the above-mentioned arrangement of the guide baffle 40 can make the guide baffle 40 and the flow direction of the liquid medium driven by the stirring impeller 51 perpendicular, or at a large angle, thereby improving the barrier effect on the liquid medium and thus improving the mixing efficiency. In addition, when the liquid medium flows out from the guide gap between the second guide baffle 42 and the groove wall, a part of the liquid medium is guided by the second guide baffle 42 to flow toward the middle of the groove cavity 24, extending the flow path of the liquid medium in the stirring zone 241, improving the mixing effect of the liquid medium, and thus 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 groove 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, the first guide hole 411 and the guide hole 44 are arranged 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 hole 411 and the guide hole 44 close to the second guide plate 42, and the liquid medium in the working zone 242 flows to the stirring zone 241 through the first guide hole 411 and the guide hole 44 close to the third guide plate 43, that is, the circulation between the stirring zone 241 and the working zone 242 is realized through the first guide hole 411 and the guide hole 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 increasing the degree of mixing of the liquid medium heat exchanged between 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, resulting in excessively high or low temperatures. 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, the third guide holes 431 and 44 are disposed 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, exemplarily, the first guide plate 41 is provided with a first guide hole, the second guide plate 42 is a non-porous plate, and the third guide plate 43 is provided with a third guide hole. If the stirring impeller 51 rotates clockwise, the lower part of the first guide plate 41 (i.e., the side along 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 along 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 plate 42 will move in the direction of the second guide plate 42. Since the second guide plate 42 is not provided with the guide hole 44, the liquid medium located on the side of the second guide plate 42 will continue to return to the stirring zone 241 for stirring and mixing under the obstruction of the second guide 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 in the first guide plate 41 close to the second guide plate 42 to the working zone 242 when passing through the first guide plate 41. During the clockwise rotation of the stirring impeller 51, the liquid medium close to the third guide plate 43 will move in the direction away from the third guide plate 43, so that the liquid medium in the working zone 242 will pass through the first guide plate 41. The first guide holes 411 and 44 near the third guide plate 43 in the plate 41 flow to the stirring zone 241, and the third guide holes 431 and 44 of the third guide plate 43 flow to the stirring zone 241. In this way, it can be ensured that the liquid medium in the stirring zone 241 will not directly enter the working zone 242 from the guide holes 44 under the stirring of the stirring impeller 51, but will continue to mix in the stirring zone 241 under the obstruction of the second guide plate 42, and then pass through a part 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 from part of the first guide holes 411 and 44 and the third guide holes 431 and 44, so as to achieve full mixing of the liquid media in the stirring zone 241 and the working zone 242, thereby improving the temperature field uniformity of the liquid medium in the working zone 242.

[0160] Reference Figure 5As shown, exemplarily, the first guide plate 41 is provided with a first guide hole, the second guide plate 42 is a non-porous plate, and the third guide plate 43 is provided with a third guide hole. 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 direction of the y direction) is the third guide plate 43. When the stirring impeller 51 rotates counterclockwise, the liquid medium in the stirring zone 241 will mix 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 plate 42 will move in the direction of the second guide plate 42. Since the second guide plate 42 is not provided with the guide hole 44, the liquid medium located on the side of the second guide plate 42 will continue to return to the stirring zone 241 for stirring and mixing under the obstruction of the second guide 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 in the first guide plate 41 close to the second guide plate 42 to the working zone 242 when passing through the first guide plate 41. When the stirring impeller 51 rotates clockwise, the liquid medium close to the third guide plate 43 will move in the direction away from the third guide plate 43, so that the liquid medium in the working zone 242 will pass through the first guide plate 41. The first guide holes 411 and 44 near the third guide plate 43 in the plate 41 flow to the stirring zone 241, and the third guide holes 431 and 44 of the third guide plate 43 flow to the stirring zone 241. In this way, it can be ensured that the liquid medium in the stirring zone 241 will not directly enter the working zone 242 from the guide holes 44 under the stirring of the stirring impeller 51, but will continue to mix in the stirring zone 241 under the obstruction of the second guide plate 42, and then pass through a part 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 from part of the first guide holes 411 and 44 and the third guide holes 431 and 44, so as to achieve full mixing of the liquid media in the stirring zone 241 and the working zone 242, thereby improving the temperature field 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. In order to distinguish it from the temperature measuring element for measuring the first side wall 21 hereinafter, the 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 a first temperature measuring element 34, can be disposed in the working area 242, or can be disposed 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 from the working area 242 to the stirring area 241.

[0165] By setting the first temperature measuring element 34 on the first flow guide plate 41 or the third flow guide plate 43, on the one hand, the space occupied by the first temperature measuring element 34 in the working area 242 can be reduced, and the effective use space of the working area 242 can be increased, so as to ensure that the instrument to be measured can be extended to a more suitable position in the working area 242 for temperature calibration. On the other hand, compared with setting the first temperature measuring element 34 at other positions in the working area 242, setting 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 temperature measurement accuracy of the liquid medium in the working area 242.

[0166] Furthermore, if the first temperature measuring element 34 is disposed 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 the measurement result that can characterize the temperature change of the working area more quickly. If the first temperature measuring element 34 is disposed 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. Exemplarily, 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 send the temperature measurement result to the control device, and the control device 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 finally 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, and 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, thereby improving the temperature control accuracy of the first temperature control module 31 and the second temperature control module 32 on the liquid medium.

[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 to improve the uniformity of the liquid medium in the trough cavity 24 in the horizontal direction. The liquid medium can also pass from under the guide baffle 40 to improve 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 at the opening on 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 through the stirring mounting portion 54. Exemplarily, the stirring impeller 51 is connected to the output shaft of the stirring motor 53 through the driving rod 52, so that the output shaft of the stirring motor 53 drives the stirring impeller 51 to rotate through the driving rod 52. Among them, the stirring motor 53 is fixed on the stirring mounting portion 54.

[0172] In some examples, the flow 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 flow 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 , and the thermal insulation layer 70 wraps the second temperature control module 32 and the outer side of the tank body 20 .

[0174] Since the second temperature control module 32 is arranged on the outer side 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 side of the first side wall 21 not covered by the second temperature control module 32, and other side walls. In this way, compared with 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 side 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 insulation layer 70 is attached to the second temperature control module 32 and the outer side of the tank body 20 to increase the contact area between the insulation layer 70 and the second temperature control module 32 and the outer side wall of the tank body 20, reduce the heat transfer between the second temperature control module 32 and the tank body 20 and the surrounding environment, so that the refrigerant in the refrigeration cavity 321 can cool the first side wall 21 to a greater extent, and reduce the heat exchange between the refrigerant and the surrounding environment, reduce the power consumption of the refrigeration compressor 33, and improve the refrigeration efficiency of the refrigerant in the refrigeration cavity 321 to the first side wall 21. In addition, the insulation layer 70 is attached to the second temperature control module 32 and the outer side of the tank body 20, reducing the air gap that may exist on the outer side of the tank body 20. Compared with setting a heat dissipation duct on the outer side of the tank body 20, it 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 in 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, causing heat leakage in the slot 25, resulting in a faster temperature drop of the liquid medium near the top of the slot cavity 24.

[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 arranged on the surface of the constant temperature liquid tank, so that the airflow of the heat dissipation duct 81 can exchange heat with the liquid medium at the bottom of the groove 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 groove cavity 24. After the temperature verification is completed, the groove is opened, and the outlet of the heat dissipation duct 81 is opened, and the liquid medium near the groove area can dissipate heat naturally, and the bottom of the groove cavity 24 can be forced to dissipate heat through the heat dissipation duct 81, thereby improving the heat dissipation efficiency and solving the problem of slow heat dissipation of the liquid medium at the bottom of the groove 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 fitted with the second side wall 22 to reduce the heat transfer between the second side wall 22 and the surrounding environment, and ensure the temperature stability of the middle area of ​​the slot cavity 24. It can be understood that if a heat dissipation duct is set around the second side wall 22, during the temperature verification process, due to the 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 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 the thermal insulation layer 70 is fitted with the second side wall 22, which 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 in the figure, the outlet of the heat dissipation duct 81 is connected to the outside of the shell 10, that is, 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, and 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 slot cavity 24, forced air cooling can be used to dissipate the 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 take 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 slot body 20.

[0179] In some examples, a first air valve may be provided at the outlet of the heat dissipation air duct 81, and a second air valve may be provided at the inlet of the heat dissipation air duct 81, so as to open or block the heat dissipation air duct 81 when necessary. 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 may 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 may 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 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 the mutual interference of airflows at the first vent 84 and the second vent 85 .

[0182] Reference Figure 1 , Figure 2 and Figure 4 As shown, exemplarily, the shell 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 a top opening; 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 , etc.

[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 side wall 22 of the trough body 20 is connected to the inner wall of the second shell 12, and the first vent 84 can be provided on the second shell 12. There can be one or more second vents 85. When there are more than one second vent 85, the plurality of second vents 85 can be provided on at least one of the first shell 11, the third shell 13, the fourth shell, and the bottom shell 14.

[0186] For example, the second vents 85 can be provided in the first housing 11, the third housing 13, the fourth housing and the bottom housing 14 in the area near the first fan 82, so that 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 form an air duct for air circulation. When the bottom wall 23 of the tank body 20 needs to be cooled quickly, 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, the bottom wall 23 of the tank body 20 is cooled, 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 further 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 by 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 with 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 is understandable that if the second fan 83 is reversed, that is, the second fan 83 can blow external air into 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 opposite, and a similar cooling effect can be achieved.

[0190] For example, the third vent 86 may be disposed in a lower region of the second housing 12 , for example, may be disposed 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 installation portion 54, and a third fan 55 is provided on the stirring installation portion 54. The third fan 55 cooperates with the fourth vent 56 to dissipate heat for the stirring motor 53, thereby 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 part of the tank cavity 24. In this way, when the liquid medium expands due to heat, if it is higher than or about to be higher than the position of the drain pipe 200, it can be discharged from the drain pipe 200 to the liquid storage tank 100, reducing the risk of overflow from the slot when the liquid medium in the tank cavity 24 is too full.

[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 used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

[0196] The embodiment of the present application further provides a temperature control method of 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 a target temperature and a current temperature of a liquid medium in a tank cavity;

[0199] Exemplarily, 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 simultaneously, 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 slot 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 slot cavity, which causes the temperature of the liquid medium in the slot 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] Exemplarily, since the second temperature control module is arranged outside the tank cavity, the temperature control value of the second temperature control module can be determined according to factors such as the target temperature, the first side wall thickness 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: According to the current temperature of the second temperature control module and the temperature control value, the output power of the second temperature control module is controlled 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, 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, 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 be different 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 heats 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 may 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 may be less than or equal to the maximum heating power of the first temperature control module. It is understandable 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 may 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 may be less than or equal to the maximum cooling power of the first temperature control module. It is understandable 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, obtaining 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 according to 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 slot cavity. Of course, according to the position of the first temperature measuring element in the slot 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 slot cavity. For example, the first temperature measuring element is set near the slot. Due to the heat leakage in the slot, the temperature value measured by the first temperature measuring element may be lower than the current temperature of the liquid medium in the slot. Then, the temperature value measured by the first temperature measuring element can be added to the preset compensation value to obtain the current temperature of the liquid medium in the slot cavity. Among them, the preset compensation value can be adjusted according to the actual position of the first temperature measuring element.

[0222] S302 can be implemented in whole or in part before, simultaneously with, or after S301. For example, obtaining the target temperature occurs before S301. Another example is that obtaining the target temperature occurs during S301. Another example is that 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 understandable that the heating power of the first temperature control module can be adjusted to a first heating power value at one time, and the first heating power 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 is reduced to the target temperature.

[0229] As a second adjustment method, if the current temperature of the liquid medium in the slot 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 slot cavity can be cooled under the minimum heating power until the current temperature of the liquid medium in the slot 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 understandable that the cooling power of the first temperature control module can be adjusted to a first cooling power value at one time, and 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 is reduced 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 is reduced to the target temperature.

[0233] It can be understood 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 understandable that the heating power of the first temperature control module can be adjusted to the second heating power value at one time, and 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 is increased to 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 understandable that the cooling power of the first temperature control module can be adjusted to a second cooling power value at one time, and 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 rises to 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 can be understood that when the first temperature control module includes a first heating body, and the temperature of the liquid medium in the tank cavity is increased 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 slot 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 slot 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 slot 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 slot 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 slot cavity reach the target temperature can be achieved, it can be used as a means of realizing control of 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, the 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 adjusted directly, 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, and 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 reference S102, if the current temperature of the liquid medium in the slot 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 of the target power range, the output power of the second temperature control module is actually increased from P0 to P2, and P2>P1. If the current temperature of the liquid medium in the slot 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 of the target power range, the output power of the second temperature control module is actually reduced from P0 to P4, and P4<P3.

[0253] In some examples, such as reference 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 has exceeded 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 capacity of the first temperature control module, it can be considered that the disturbance is not temporary but continuous, and 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 according to the output power and the target power range of the first temperature control module, that is, S304, may include adjusting the module desired temperature according to 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 according to 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 desired module 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 module expected 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 module expected temperature of the second temperature control module can be set according to factors such as the target temperature and the ambient temperature.

[0259] Among them, if the target temperature is lower than the ambient temperature, the expected module 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 expected module temperature, the second temperature control module controls the temperature of the liquid in the slot cavity through the first side wall so that the current temperature of the liquid medium in the slot cavity reaches the target temperature.

[0260] If the target temperature is higher than the ambient temperature, the expected module 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 expected module temperature, the second temperature control module controls the temperature of the liquid in the slot cavity through the first side wall so that the current temperature of the liquid medium in the slot cavity reaches the target temperature.

[0261] In some examples, if the module expected 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 module expected temperature is lowered. That is, when 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 module expected temperature can be lowered.

[0262] Exemplarily, the preset module desired temperature may be lowered to a first module desired temperature, where the first module desired temperature is lower than the preset module desired 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 expected temperature of the module 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 expected temperature of the module can be increased;

[0264] Exemplarily, 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 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 of the target power range, for example, greater than or equal to the maximum heating power of the first temperature control module, the expected module temperature can be increased.

[0266] Exemplarily, the preset module desired temperature may be increased to a third module desired temperature, where the third module desired temperature is higher than the preset module desired 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] Exemplarily, the preset module desired temperature may be lowered to a fourth module desired temperature, where the fourth module desired temperature is lower than the preset module desired temperature.

[0269] S3042, 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 expected 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 expected 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 according to 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 according to the module expected 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 may 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 expected temperature of the module, 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 expected temperature of the module.

[0275] It is understandable that the heating power of the second temperature control module can be adjusted to a third heating power value at one time, and 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 is increased to the desired temperature of the module.

[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 expected temperature of the module, 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 expected temperature of the module.

[0278] It is understandable that the cooling power of the second temperature control module can be adjusted to a third cooling power value at one time, and 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 rises to the desired temperature of the module.

[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 up under the minimum cooling power until the current temperature of the second temperature control module rises to the expected temperature of the module.

[0280] It can be understood 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 may 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 expected temperature of the module, 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 expected temperature of the module.

[0284] It is understandable that the heating power of the second temperature control module can be adjusted to a fourth heating power value at one time, and 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 temperature of the module.

[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 under 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 expected temperature of the module, 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 expected temperature of the module.

[0287] It is understandable that the cooling power of the second temperature control module can be adjusted to a fourth cooling power value at one time, and the fourth cooling power 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 temperature of the module.

[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 can be understood 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 slot cavity reaches the target temperature, the module expected temperature of the second temperature control module can be adjusted instantly according to the output power and the target power range of the first temperature control module. The output power and the 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 can be 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 slot 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 slot 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 can be understood that K and b are supplementary parameters preset by the control module. T By inserting 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 larger the output power of the second temperature control module is, so as to increase the temperature control amplitude of the liquid medium in the tank cavity; 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, so as to reduce the temperature control amplitude of the liquid medium in the tank cavity.

[0296] For example, the target temperature is 200°C, and the current temperature of the liquid medium in the slot 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 where 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 slot cavity is higher, and the heating rate of the liquid medium in the slot cavity is faster.

[0297] In some examples, the absolute value of the difference between the current temperature of the liquid medium in the tank cavity 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 (i.e. |T T -T1|) is greater than the temperature difference threshold, the first compensation parameter K=k1 is determined, and 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|. It can be understood that the temperature threshold is a parameter preset by the control module, which can be specifically determined according to 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 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 greater the expected module temperature of the second temperature control module is. Therefore, the output power of the second temperature control module can be adjusted significantly to make the current temperature of the second temperature control module change significantly, 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 smaller 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, so as to fine-tune the current temperature of the liquid medium in the tank cavity and stabilize 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 to k1=2, and the expected temperature of the module is 510℃. After that, when the temperature of the liquid medium in the tank reaches 150℃, |T T-T1|<100, corresponding k1=1, and the module expected temperature is 260℃. Compared with the liquid medium in the tank cavity reaching 150℃, the module expected temperature corresponding to the liquid medium in the tank cavity at 50℃ is higher. To achieve this module expected 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 disturbance amplitude of the environment on the liquid medium in the tank cavity. The larger the absolute value of the difference between the ambient temperature and the target temperature, the larger 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 it is necessary 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 fine-tune or maintain the current temperature of the liquid medium in the tank cavity, so as 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 a small disturbance of 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] Exemplarily, after the desired module temperature of the second temperature control module is adjusted according to the current temperature of the liquid medium in the slot cavity and the target temperature, 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 desired module temperature, thereby ensuring the cooperation of the second temperature control module and the first temperature control module so that the liquid medium in the slot 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 temperature of the module 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 present application embodiment is based on T R2 =T T +K(T T -T1)+b is a formula that first adjusts the expected module temperature of the second temperature control module, and then controls the output power of the second temperature control module based on the expected 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 of the liquid medium in the tank cavity and the target temperature as well as environmental factors, appropriate K and b are determined, so that when the current temperature of the second temperature control module reaches the expected 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 reached the target temperature, and is also applicable to the regulation process when the liquid medium in the tank cavity reaches the target temperature.

[0311] In some examples, while the output power of the second temperature control module is controlled according to the desired temperature of the module and the current temperature of the second temperature control module, the first temperature control module is also continuously working. Through the 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 exceeds the target power range, that is, the first temperature control module exceeds 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, in the process of heating 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 slot 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 value 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 slot cavity to the target temperature, and 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 slot 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, thereby increasing the heating power of the second temperature control module 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 slot 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 slot 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 slot cavity to the target temperature, and 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 slot 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, thereby reducing the heating power of the second temperature control module 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 slot 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 value 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 value 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 slot 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 slot cavity to the target temperature, and 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 slot 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, thereby increasing the cooling power of the second temperature control module 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 slot 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 expected temperature of the module, 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 expected temperature of the module.

[0320] For example, when the temperature of the liquid medium in the slot cavity is lower than the target temperature, and the cooling power of the first temperature control module is lower 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 slot cavity to the target temperature, and 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 slot 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, thereby reducing the cooling power of the second temperature control module 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 slot 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 expected module temperature of the second temperature control module, so that the liquid medium in the tank cavity is adjusted to the target temperature through heat transfer through the first side wall. 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, and the output power of the first temperature control module only needs to be adjusted according to the current temperature of the liquid medium in the tank cavity, so as 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 smaller 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 respond quickly to the temperature fluctuation 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 the liquid medium in the tank cavity is adjusted from the initial temperature to the target temperature, the output power of the first temperature control module is adjusted and the output power of the second temperature control module is kept unchanged, so that 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 a role in 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, due to the existence of the first side wall, the risk of overheating or overcooling of the liquid medium can also be alleviated.

[0325] For example, when the first temperature control module includes a first heating body and the second temperature control module includes a second heating body, the heating power of the second heating body may be greater than the heating power of the first heating body. When the first temperature control module includes a first refrigeration body (such as a combination of a refrigeration chamber and a refrigeration compressor) and the second temperature control module includes a second refrigeration body, the refrigeration power of the second refrigeration body may be greater than the refrigeration power of the first heating body.

[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, the blockage degree of the expansion valve port filter, etc., 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 preferentially 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 it is determined 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 preferentially.

[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 used to limit the protection scope of the embodiments of the present application. Any modifications, equivalent substitutions, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the protection scope of the embodiments of the present application.

Claims

1. A constant temperature liquid tank, characterized in that: include: A tank body, used to contain a liquid medium, the tank body comprising a first side wall and a second side wall opposite to each other, a tank cavity being formed between the first side wall and the second side wall; A flow guide baffle is arranged in the groove cavity, a stirring zone is arranged between the flow guide baffle and the first side wall, a working zone is arranged between the flow guide baffle and the second side wall, the working zone is used to place the instrument to be tested, and a flow guide hole is arranged on the flow guide baffle; A temperature control component, consisting of a first temperature control module and a second temperature control module, wherein the first temperature control module is arranged in the stirring zone, and the first temperature control module is used to heat or cool the liquid medium in the stirring zone, and the second temperature control module is arranged outside the tank body and located on the first side wall, and the second temperature control module 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 zone through the guide hole.

2. The constant temperature liquid tank according to claim 1, characterized in that: The groove body further includes a third side wall connected between the first side wall and the second side wall, a fourth side wall arranged 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 groove 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 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 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 are gathered 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: The first guide plate is provided with a first guide hole, 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 area flows to the working area through the guide gap; The third flow guide plate is provided with a third flow guide hole, so that the liquid medium in the working area flows to the stirring area through the third flow guide hole.

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

8. The constant temperature liquid tank according to claim 1, characterized in that: It also includes a guide fixing part arranged above the trough body, the guide fixing part 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 a refrigeration compressor so that a 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 heat preservation layer, and the heat preservation layer 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 comprises 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 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 groove 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 comprises a tank body, a guide baffle, a temperature control component and a stirring impeller, the tank body comprises 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 the instrument to be tested, a guide hole is arranged on the guide baffle, the temperature control component consists 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 on the outside of the tank body and located on the first side wall, and the stirring impeller is arranged in the stirring zone; the temperature control method comprises: 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, 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; 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 expected temperature of the module and the current temperature of the second temperature control module, so that the current temperature of the second temperature control module reaches the expected temperature of the module.

19. The temperature control method according to claim 17, characterized in that: 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 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, b is the second compensation parameter, if the target temperature is higher than the ambient temperature, K>0, b>0, if the target temperature is lower than the ambient temperature, 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 expected temperature of the module and the current temperature of the second temperature control module, so that the current temperature of the second temperature control module reaches the expected temperature of the module.

20. The temperature control method according to claim 19, characterized in that: 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, characterized in that: When the absolute value of the difference between the current temperature of the liquid medium in the slot 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 slot 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, characterized in that: 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 smaller 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 larger 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 comprises a first temperature measuring element, which is disposed in the tank cavity; the obtaining of the target temperature and the current temperature of the liquid medium in the tank cavity comprises obtaining measurement information from the first temperature measuring element, and determining the current temperature of the liquid medium in the tank cavity according to 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 according to 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, the heating power of the first temperature control module is reduced, or the first temperature control module is controlled to reach a minimum heating power, or the cooling power of the first temperature control module is increased, or the first temperature control module is controlled 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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