CN116818392A - Refrigeration performance test system for thermoelectric device - Google Patents

Abstract

The application relates to a refrigerating performance test system for a thermoelectric device. The utility model provides a thermoelectric device refrigerating performance test system, including measuring element, power supply unit and sample platform, the sample platform is used for the centre gripping thermoelectric device that awaits measuring, power supply unit and thermoelectric device that await measuring constitute test loop in order to divide into hot junction and cold junction with the both ends of thermoelectric device that await measuring, the sample platform is including being used for making the constant temperature portion of the hot junction temperature of thermoelectric device and optionally providing the warm portion of heat for the cold junction of thermoelectric device, the hot junction and the constant temperature portion butt of thermoelectric device await measuring, the cold junction and the warm portion butt of thermoelectric device await measuring, measuring element respectively with constant temperature portion, the thermoelectric device that await measuring and the warm portion connection of moving are used for gathering the refrigeration parameter of thermoelectric device that await measuring, wherein measuring element utilizes the temperature difference of the warm portion in at least 2 positions department first temperature and second temperature to realize the test to the refrigerating capacity of thermoelectric device.

Description

Refrigeration performance test system for thermoelectric device

Technical Field

The application relates to the technical field of semiconductor device testing, in particular to a thermoelectric device refrigerating performance testing system.

Background

Compared with the traditional refrigeration technology, the thermoelectric conversion technology based on the Peltier effect can realize refrigeration, has the advantages of no need of a compressor, environment friendliness, safety, reliability, long service life and the like, has high response speed and high temperature control precision, can be integrated in other electronic equipment for local refrigeration temperature control, and is even irreplaceable in some special occasions (narrow space, large temperature difference and the like).

Chinese patent CN 113466542A discloses a thermoelectric refrigeration device performance testing apparatus and testing method, but the following problems exist: on the one hand, when the device tests the refrigerating capacity and the refrigerating efficiency, the electric power of the cold end compensation heater is directly used as the refrigerating capacity of the device, and as is well known, a large part of electric heating power is radiated to the external environment through heat, so that the refrigerating capacity obtained by the test is larger and the refrigerating efficiency is smaller by adopting the method; on the other hand, the device adopts a point contact pressurizing mode, the stress of the sample is concentrated, and the temperature of the cold surface of the sample is not uniform and even the sample is damaged easily.

In addition, chinese patent CN 212459488U discloses a semiconductor refrigerating sheet temperature difference testing device, which, although provided with a first heat insulation pad and a second heat insulation pad, indirectly communicates the hot end and the cold end, the cold end load is greatly affected by heat conduction, convection and radiation, and the hot end also has no temperature control device, and as the testing time increases, the temperature of the hot end rapidly increases, and the temperature of the cold end also increases, therefore, only the temperature difference at room temperature can be roughly measured, and the device also cannot test the refrigerating capacity and the refrigerating efficiency.

In view of the above, the measurement accuracy of the refrigeration performance of the thermoelectric device in the prior art is insufficient, and further improvement is required.

Disclosure of Invention

The application provides a test system and a test method for the refrigeration performance of a thermoelectric device, which are used for realizing more accurate measurement of the refrigeration performance of the thermoelectric device.

According to a first aspect of the application, a refrigeration performance testing system for a thermoelectric device is provided, the refrigeration performance testing system comprises a measuring unit, a power supply unit and a sample table, the sample table is used for clamping the thermoelectric device to be tested, the power supply unit and the thermoelectric device to be tested form a testing loop so as to divide two ends of the thermoelectric device to be tested into a hot end and a cold end, the sample table comprises a constant temperature part for enabling the hot end temperature of the thermoelectric device to be constant and a movable temperature part for selectively providing heat for the cold end of the thermoelectric device, the hot end of the thermoelectric device to be tested is abutted against the constant temperature part, the cold end of the thermoelectric device to be tested is abutted against the movable temperature part, the measuring unit is respectively connected with the constant temperature part, the thermoelectric device to be tested and the movable temperature part are connected for collecting refrigeration parameters of the thermoelectric device to be tested, and the measuring unit realizes the test of the refrigeration quantity of the thermoelectric device by utilizing the temperature difference of the movable temperature part between a first temperature and a second temperature at least 2 positions away from the thermoelectric device.

Optionally, in some embodiments of the present application, the temperature-moving part is provided with a first hole on a side close to the cold end of the to-be-measured thermoelectric device, and a second hole on a side far from the cold end of the to-be-measured thermoelectric device, where the first hole and the second hole are respectively connected with the measurement unit to obtain a first temperature and a second temperature, so as to implement calculation of refrigeration capacity of the to-be-measured thermoelectric device.

Optionally, in some embodiments of the present application, the refrigerating capacity of the thermoelectric device to be tested is obtained through calculation according to the following formula,

，

wherein λ is a material thermal conductivity of the movable temperature portion; delta T is the difference between the first temperature and the second temperature on the movable temperature part; w is the length of the cross section of the movable temperature part; l is the sectional area width of the movable temperature part; and H is the distance between the first hole and the second hole on the movable temperature part.

Optionally, in some embodiments of the present application, the temperature-moving part includes a temperature measuring block, a heat flow meter and a heat source, the temperature-moving part is connected to the temperature measuring block through one side of the heat flow meter, the other side of the heat flow meter is connected to the heat source, and the temperature-moving part is abutted to the cold end of the thermoelectric device to be measured through the temperature measuring block, wherein

The heat source can provide heat for the cold end of the thermoelectric device to be measured so that the temperature of the cold end and the hot end of the thermoelectric device to be measured are the same, and the measuring unit obtains the refrigerating capacity of the thermoelectric device to be measured based on the temperature values of the heat flow meter at different positions away from the thermoelectric device to be measured.

Optionally, in some embodiments of the present application, the refrigeration parameter includes refrigeration efficiency, and the measurement unit is connected to the thermoelectric device to be measured and is used for measuring input power of the thermoelectric device to be measured, where

The measuring unit obtains the refrigerating efficiency of the thermoelectric device to be measured based on the input power and the refrigerating capacity of the thermoelectric device to be measured.

Optionally, in some embodiments of the present application, the cross-sectional dimensions of the temperature measuring block and the heat flow meter are consistent with the cold end dimensions of the thermoelectric device to be measured.

Optionally, in some embodiments of the present application, the thermoelectric device refrigeration performance testing system further includes a temperature control unit for controlling the temperature of the constant temperature part and the heat source, wherein

The temperature control unit has a dual channel PID control to independently control the thermostat and the heat source.

Optionally, in some embodiments of the present application, the sample stage further includes a clamping portion, where the clamping portion is respectively abutted with the constant temperature portion and the dynamic temperature portion to implement clamping of the thermoelectric device to be tested.

Optionally, in some embodiments of the present application, the clamping portion includes a frame, a transmission shaft, and a driver for driving the transmission shaft to move in a set direction, wherein

The frame body comprises an upper pressing plate, an upper supporting rod and a base plate, wherein the upper pressing plate is movably connected with the base plate through the upper supporting rod, the constant temperature part is used for sequentially stacking the thermoelectric device to be tested and the movable temperature part on the base plate, the upper pressing plate is abutted to the movable temperature part, and the transmission shaft penetrates through the base plate and is abutted to the constant temperature part.

Optionally, in some embodiments of the present application, the clamping portion further comprises a bellows sleeved on the drive shaft disposed between the base plate and the driver, wherein

The corrugated pipe, the base plate and the driver are all sealed and fixed.

Optionally, in some embodiments of the present application, the refrigeration performance includes a maximum temperature difference, a maximum refrigeration capacity, and a refrigeration efficiency, wherein

When the refrigeration performance testing system of the thermoelectric device is in a state of testing the maximum refrigeration capacity or the refrigeration efficiency, the temperature-varying part provides heat for the cold end of the thermoelectric device.

Optionally, in some embodiments of the present application, the test system further includes an atmosphere unit, where the atmosphere unit is configured to provide a test atmosphere for the thermoelectric device.

In a second aspect of the present application, a method for testing the refrigerating performance of a thermoelectric device is provided, and the system for testing the refrigerating performance of the thermoelectric device is used for testing, and the method for testing the refrigerating performance of the thermoelectric device comprises the following steps:

setting a thermoelectric device to be tested on a sample table, so that the thermoelectric device to be tested is abutted with the constant temperature part and the movable temperature part, and electrically connecting the thermoelectric device to be tested with the power supply unit and the measuring unit;

the constant temperature part is adjusted to be at a set temperature, refrigeration temperature difference values under different current values are obtained, and the maximum temperature difference value and the optimal working current are determined;

and adjusting the power supply unit to an optimal working current state, and providing heat for the cold end of the thermoelectric device by adjusting the temperature-moving part so as to enable the temperature of the cold end and the hot end of the thermoelectric device to be detected to be the same, acquiring data of refrigerating capacity and input electric power under different temperature differences, and determining the maximum refrigerating capacity and refrigerating efficiency.

The application has the beneficial effects that:

when the maximum temperature difference is tested, the temperature measuring block is arranged and closely attached to cover the cold end of the thermoelectric device, and the temperature is measured against the pressure, so that the cold end of the thermoelectric device is prevented from transferring heat between the structural member and the surrounding environment, and the influence of environmental heat load is effectively reduced;

the temperature measuring block with high heat conductivity is tightly attached to the thermoelectric device, so that the temperature field is more uniform, and the real temperature difference of the thermoelectric device can be reflected better than the point contact temperature measurement;

in the maximum refrigeration mode, according to the linear relation between the temperature difference and the refrigeration capacity, the method for obtaining the maximum refrigeration capacity by measuring a group of temperature difference-refrigeration capacity is compared with the method for testing only one point, so that errors caused by some accidental factors can be avoided;

the method for measuring the refrigerating capacity by adopting the heat flow meter is more accurate, and the influences of heat radiation, convection and the like of the heater are avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a refrigeration performance test system for thermoelectric devices provided by the application;

FIG. 2 is a block diagram of a sample holder provided by the present application;

FIG. 3 is a block diagram of a heat flow meter according to the present application;

FIG. 4 is a block diagram of a sample stage of a hold-down mechanism according to the present application

FIG. 5 is a schematic diagram of a maximum temperature differential test provided by the present application;

FIG. 6 is a schematic diagram of a maximum refrigeration capacity and refrigeration efficiency test provided by the application;

FIG. 7 is a graph showing the thermal conductivity properties of a copper block used in a heat flow meter according to the present application;

FIG. 8 is a graph showing the relationship between the refrigeration temperature difference and the current of the thermoelectric device tested in the example;

FIG. 9 is a graph showing the relationship between the refrigerating capacity and the refrigerating temperature difference of the thermoelectric device tested in the example;

fig. 10 is a graph showing the relationship between the refrigeration efficiency and the refrigeration temperature difference of the thermoelectric device tested in the example.

Reference numerals:

10, an atmosphere unit; 20, a sample stage;

210, a constant temperature part; 211, a constant temperature table; 212, a constant temperature source;

220, a warm portion; 221, a temperature measuring block; 222, a heat flow meter; 2221, first hole; 2222, second hole; 223 a heat source;

230, a clamping portion; 2311, an upper press plate; 2312, an upper support rod; 2313, a substrate; 2314, a lower pressing plate; 2315, a lower support rod; 232, a drive shaft; 2331, cylinders; 2332, cylinder joint; 2333, weighing sensors; 234, bellows; 235, a thermal insulation member;

30, a thermoelectric device; 40, a power supply unit; 50, a measuring unit, 60, a control unit; 70, a temperature control unit.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the application. In the present application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left", "right", "front", "rear" are generally used to refer to the directions of the upper, lower, left and right sides of the device in actual use or operation, and are specifically shown in the drawings.

It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.

With the application development of the thermoelectric refrigeration technology in the industrial field, devices with various shapes and sizes and even some shapes are irregular appear, however, the most direct technical parameters reflecting the good or bad refrigeration performance of the thermoelectric device mainly comprise the maximum temperature difference T_max, the maximum refrigeration capacity Q_max and the refrigeration efficiency COP at a certain temperature.

The maximum temperature difference, the maximum refrigerating capacity and the refrigerating efficiency are defined as follows:

when the thermoelectric device works at the optimal current and the cold end heat load is zero in the refrigeration mode, the temperature difference at the two ends of the device is the maximum temperature difference fatmax in the stable state;

when the thermoelectric device works at the optimal current in the refrigeration mode and the temperature difference between two ends is zero, the heat extraction capacity of the cold end of the device is the maximum refrigeration capacity Q_max;

in the refrigeration mode, when the thermoelectric device works, the ratio of the refrigeration capacity to the input electric power is refrigeration efficiency.

Referring to fig. 1 to 10, fig. 1 shows a system for testing the refrigerating performance of a thermoelectric device 30, wherein the refrigerating performance includes a maximum temperature difference, a maximum refrigerating capacity and a refrigerating efficiency, an atmosphere unit 10 for providing a test atmosphere for the thermoelectric device 30, a sample stage 20 for placing the thermoelectric device 30, a power supply unit 40 for electrically connecting with the thermoelectric device 30 to form a test loop, and a measuring unit 50 for collecting refrigerating parameters of the thermoelectric device 30. The test atmosphere is preferably a vacuum or inert test atmosphere.

The power supply unit 40 and the thermoelectric device 30 constitute a test circuit, and the on-current of the test circuit forms the two ends of the thermoelectric device 30 into a hot end and a cold end. Referring to fig. 2, the sample stage 20 includes a constant temperature part 210 and a movable temperature part 220. Specifically, the hot end of the thermoelectric device 30 abuts against the constant temperature part 210, and the constant temperature part 210 is used to maintain the hot end of the thermoelectric device 30 at a constant temperature.

The cold end of the thermoelectric device 30 abuts against the movable temperature part 220. The movable temperature section 220 is used to selectively provide heat to the cold side of the thermoelectric device 30 to ensure that the cold side of the thermoelectric device 30 has sufficient heat to absorb heat. Specifically, when the refrigeration performance testing system of the thermoelectric device 30 is used for testing the maximum temperature difference of the thermoelectric device 30, the temperature-varying part 220 does not need to provide heat for the cold end of the thermoelectric device 30; when the refrigeration test system of the thermoelectric device 30 is used for testing the maximum refrigerating capacity and the refrigerating efficiency of the thermoelectric device, the temperature-varying part 220 is used for conducting heat to the thermoelectric device 30, so that the cold end temperature of the thermoelectric device 30 is maintained at a specific value.

The measuring unit 50 is connected to the constant temperature part 210, the thermoelectric device 30, and the dynamic temperature part 220, respectively, to measure one or more of the refrigeration parameters of the thermoelectric device 30, such as the temperature values of the cold and hot sides, the refrigerating capacity, the input electric power, etc.

When the maximum temperature difference of the thermoelectric device 30 needs to be measured, the temperature of the constant temperature table 211 is set to be consistent, the power supply unit 40 gradually increases the output current from small to large, so that the cold end of the thermoelectric device 30 starts to refrigerate, the dynamic temperature part 220 does not provide heat at the moment, after the temperature of the cold end is stable, the temperature difference of the cold end and the hot end of the thermoelectric device 30 under different currents is collected through the measuring unit 50, and the maximum temperature difference is determined.

When the maximum cooling capacity of the thermoelectric device 30 needs to be measured, the temperature of the constant temperature table 211 is set to be consistent, the power supply unit 40 outputs a specific current, preferably an output current in a maximum temperature difference state, the temperature-varying part 220 supplies heat to the thermoelectric device 30 until the cold end temperature is consistent with the hot end temperature, and the measuring unit 50 detects the cooling capacities in different temperature differences to determine the maximum cooling capacity.

When it is required to measure the refrigerating efficiency (COP) of the thermoelectric device 30, the temperature of the thermostat 211 is set to be uniform, the power supply unit 40 outputs a specific current such that there is a temperature difference between the cold and hot ends of the thermoelectric device 30, and the refrigerating efficiency is determined by obtaining the input electric power calculated by measuring the input voltage and current across the pins of the thermoelectric device and the refrigerating capacity through the measuring unit 50.

Therefore, by arranging the atmosphere unit 10, the sample stage 20 including the constant temperature part 210 and the temperature moving part 220, the power supply unit 40 and the measuring unit 50 to form a refrigerating performance test system of the thermoelectric device 30 to be tested, and arranging the power supply unit 40 and the thermoelectric device 30 to form a test loop, especially arranging the temperature moving part 220 to selectively output heat, the direct test of the refrigerating performance of the thermoelectric device 30 to be tested can be well realized, and the detection efficiency is improved.

With continued reference to fig. 2-4, in one embodiment, the thermal block 220 includes a temperature measurement block 221, a heat flow meter 222, and a heat source 223. The heat flow meter 222 is connected to the heat source 223 at one side and the temperature measuring block 221 at one side, and the heat flow meter 222 is connected to the measuring unit 50 for measuring the cooling capacity of the thermoelectric device 30. The temperature measuring block 221 is abutted with the cold end of the thermoelectric device 30, and the temperature measuring block 221 is connected with the measuring unit 50 for measuring the cold end temperature of the thermoelectric device 30. A heat source 223 is coupled to the heat flow meter 222 for providing heat, such as an electric heater, preferably an armored electric heater.

Referring to fig. 2 and 3, the heat flow meter 222 is provided with a first hole 2221 near the cold end of the thermoelectric device 30 and a second hole 2222 far from the cold end of the thermoelectric device 30. The first hole 2221 and the second hole 2222 are used for respectively accommodating measurement ends of the measurement unit 50 to detect a temperature difference between the first hole 2221 and the second hole 2222, so as to realize determination of the refrigerating capacity of the thermoelectric device 30.

Specifically, the determination of the cooling capacity of the thermoelectric device 30 is obtained by calculation of the following formula:

，

wherein,,

lambda is the thermal conductivity of the material of the heat flow meter, and the unit is W/m.K;

delta T is the difference between the first temperature and the second temperature on the heat flow meter, and the unit is K;

w is the length of the cross section of the heat flow meter, and the unit is m;

l is the width of the section area of the heat flow meter, and the unit is m;

h is the distance between the first temperature detection hole and the second temperature detection hole on the heat flow meter, and the unit is m.

Thus, by providing the heat moving part 220 including the heat flow meter 222, the temperature measuring block 221 and the heat source 223, the measurement of the cooling capacity of the thermoelectric device 30 can be well realized.

It should be noted that, according to the present application, by utilizing the difference of the temperatures of the heat flow meter 222 at different positions from the thermoelectric device 30, the refrigeration capacity of the thermoelectric device 30 can be well tested by using the characteristics of the heat flow meter 222. By the scheme of the application, the problem of large measurement effect caused by directly taking the electric power of the cold side heater of the thermoelectric device 30 as the refrigerating capacity calculation of the thermoelectric device 30 in the prior art can be well solved, and the measurement accuracy is improved.

It should be noted that, for the temperature measuring block 221, the temperature measuring block 221 is provided for surface contact temperature measurement, so that the temperature difference of the thermoelectric device 30 is more uniform.

In one embodiment, the side temperature block 221 is a sheet block having a cross section that conforms to the contour dimensions of the thermoelectric device 30. Accordingly, the heat flow meter 222 is preferably a cylinder with a base cross-sectional dimension that corresponds to the thermoelectric device 30 dimension. The cold side temperature and the refrigerating capacity of the thermoelectric device 30 can be measured better.

In one embodiment, the temperature-sensing part 220 preferably has only the temperature sensing block 221 when testing the maximum temperature difference of the thermoelectric device. Since the heat flow meter 222 is a larger heat load, when the maximum temperature difference is measured, the existence of the heat flow meter 222 will affect the limit value reached by the cold end temperature of the thermoelectric device, so that a larger error exists between the maximum temperature difference value and the theoretical value of the finally measured thermoelectric device. And the temperature measuring block is only arranged on the temperature moving part when the maximum temperature difference is measured, so that the test error can be reduced to the greatest extent, and the test precision is improved.

Accordingly, in a preferred embodiment, when the maximum refrigerating capacity and the refrigerating efficiency of the thermoelectric device are tested, the actual absorption heat of the cold end of the thermoelectric device can be more accurately measured by arranging the heat flow meter, and the measurement accuracy is improved.

With continued reference to fig. 2, fig. 5, the thermostat 210 includes a thermostat 211 and a thermostat source (not shown). A constant temperature source is connected to the constant temperature stage 211 to ensure that the temperature of the constant temperature stage 211 is constant. Preferably, the constant temperature source is a water-cooled jacket.

In another embodiment, the thermostat may be embedded with an electric heater to increase the temperature range of the thermoelectric device.

In another embodiment, the cross-sectional size of the thermostatic stage 211 is larger than the thermoelectric device 30 in order to make the temperature control of the hot side of the thermoelectric device 30 more stable.

In another embodiment, blind holes are formed on the constant temperature portion 210 and the movable temperature portion 220 for accommodating the detection terminals of the measurement unit 50, so as to reduce the influence of environmental factors on the temperature detection of the thermoelectric device 30 as much as possible and improve the detection accuracy.

In another embodiment, the constant temperature stage 211, the temperature measuring block 221 and the heat flow meter 222 are made of materials with high thermal conductivity, such as metallic copper, aluminum, silicon nitride ceramics, aluminum nitride ceramics, and the like;

in another embodiment, in order to better realize temperature measurement of the thermoelectric device 30, the thermoelectric device 30 is connected to the temperature measuring block 221 and the constant temperature table 211 through a thermal paste, so as to realize good thermal contact.

Further, the power supply unit 40 is preferably a programmable dc power supply.

In yet another embodiment, referring to fig. 5-6, in order to eliminate the influence of the lead wire on the test result during the voltage test, the measurement unit 50 and the thermoelectric device 30 are connected in a four-wire manner to form a refrigeration test loop.

In another embodiment, the measuring unit 50 is provided with at least six channels, namely, a first channel (ch 1), a second channel (ch 4), a third channel (ch 3) and a fourth channel (ch 4) for collecting the hot side temperature, the cold side temperature, the first temperature of the heat flow meter 222 and the second temperature of the heat flow meter 222 of the thermoelectric device 30, and a fifth channel (ch 5) and a sixth channel (ch 6) for collecting the test current and the input voltage of the thermoelectric device, respectively;

in another embodiment, the sample stage 20 further comprises a temperature control unit having dual channel PID temperature control, a first channel for controlling the temperature of the thermostat 211 by the thermostat source temperature and a second channel for controlling the cold side temperature of the thermoelectric device 30 by controlling the heat source 223 temperature.

In another embodiment, the sample stage 20 further includes a control unit, which is connected to the temperature control unit, the power supply unit 40, the measurement unit 50 and the temperature-varying part 220 to implement automatic control, and is capable of selectively controlling the heating power of the heat source 223 to selectively provide heat to the cold end of the thermoelectric device 30, and is preferably an industrial personal computer, and is connected to the power supply unit 40 and the measurement unit 50 through a USB-to-RS-485 connection and is connected to the temperature control unit through a USB-to-GPIB connection.

In another embodiment, referring to fig. 4, in order to better implement the contact between the thermoelectric device 30 and the constant temperature portion 210 and the dynamic temperature portion 220, the sample stage 20 further includes a clamping portion 230.

As an example embodiment, the clamping part 230 includes a housing 231, a transmission shaft 232 and a driver 233, the thermoelectric device 30, the constant temperature part 210 and the moving temperature part 220 are provided in the housing 231, the constant temperature part 210 is in contact with one surface of the housing 231, and the moving temperature part 220 is in contact with the other surface of the housing 231. The drive shaft 232 passes through the frame 231 and contacts the constant temperature part 210, the drive shaft 232 is movable relative to the frame 231, and the driver 233 is used to drive the adjustment of the position of the drive shaft 232 relative to the frame 231, so as to contact the frame 231 with the constant temperature part 210 and the movable temperature part 220.

In yet another embodiment, the frame includes an upper platen 2311, an upper support post 2312 and a base plate 2313. The upper platen 2311 is movably coupled to the base plate 2313 by the upper support post 2312, preferably bolted, such that the upper platen 2311 can adjust the relative position to the upper support post 2312. The constant temperature part 210, the thermoelectric device 30 and the movable temperature part 220 are sequentially stacked on the substrate 2313, and the upper pressing plate 2311 abuts against the movable temperature part 220. The base 2313 is provided with a through hole for allowing the transmission shaft 232 to pass through the through hole and contact the constant temperature part 210.

In another embodiment, the clamping portion 230 further includes a bellows 234, the bellows 234 is sleeved on a driving shaft disposed between the substrate 2313 and the driver 233, and the bellows 234, the substrate 2313 and the driver 233 are sealed and fixed by flanges, so as to provide a better testing atmosphere for the thermoelectric device 30.

In another embodiment, the driver 233 includes an air cylinder 2331, an air cylinder 2331 connector and a weighing sensor 2333, one end of the air cylinder 2331 connector is connected with the air cylinder 2331, the other end is connected with the weighing sensor 2333, and the weighing sensor 2333 is connected with the driving rod through a flange of the bellows 234. The weighing sensor 2333 is used to display the clamping force so as to facilitate the measurer to adjust the clamping force to the constant temperature part 210 and the movable temperature part 220.

In another embodiment, the frame 231 further includes a lower pressing plate 2314 and a lower supporting rod 2315, wherein the lower pressing plate 2314 is movably connected with the base plate 2313 through the lower supporting rod 2315, preferably, a bolt connection is used to enable the lower pressing plate 2314 to adjust the relative position with the lower supporting rod 2315. The cylinder 2331 is fixedly connected with the lower pressing plate 2314, the output end of the cylinder 2331 penetrates through the lower pressing plate 2314 to be connected with the cylinder 2331 joint, and the power transmission shaft is driven to compress the thermoelectric device 30 through the constant temperature part 210 and the dynamic temperature part 220 by stretching and retracting of the output end of the cylinder 2331.

In still another embodiment, the clamping portion 230 further includes a heat insulating member 235, and the heat insulating member 235 is disposed between the upper platen 2311 and the movable temperature portion 220, for reducing geothermal transfer between the movable temperature portion 220 and the surrounding environment, and improving energy utilization efficiency.

The application also provides a testing step for testing the refrigerating performance of the thermoelectric device 30 by using the refrigerating performance testing system of the thermoelectric device 30, wherein the testing step comprises the following steps:

step one: arranging the thermoelectric device 30 to be measured on the sample stage 20, so that the thermoelectric device 30 to be measured is abutted with the movable temperature part 220 and the constant temperature part 210, and electrically connecting the thermoelectric device 30 to be measured with the power supply unit 40 and the measuring unit 50;

step two: providing a test atmosphere for the thermoelectric device 30 to be tested through the atmosphere unit 10, so that the thermoelectric device 30 to be tested is in the test atmosphere;

step three: controlling a temperature controller to enable the constant temperature table 211 to be at a set temperature, obtaining refrigeration temperature difference values under different current values, and determining a maximum temperature difference value and an optimal working current;

step four: the power supply unit 40 is adjusted to an optimal operation current state, and the heat source 223 is adjusted to make the cold side and the hot side of the thermoelectric heater have the same temperature, so that data of refrigerating capacity and input electric power under different temperature differences are obtained, and the maximum refrigerating capacity and refrigerating efficiency are determined.

Examples:

the present example provides an embodiment for measuring the performance of a thermoelectric device 30 (model TEC1-12703, cross-sectional dimension 30×30 mm) at different temperatures by using the refrigeration performance test system and test method for a thermoelectric device 30 provided by the present application.

The size of the constant temperature table 211 is 60×60mm according to the cross-sectional size of the sample, the cross-sectional sizes of the temperature measuring block 221 and the heat flow meter 222 are 30×30mm, the heat flow meter 222 is formed by processing a high-purity copper block, the heat conductivity of the high-purity copper block is shown in fig. 7, the distance between two temperature measuring holes is 30mm, the cold end and the hot end of the sample are coated with heat conducting paste and then are mounted on a sample frame, a lead wire is connected, and a thermocouple is inserted into the corresponding temperature measuring hole.

Closing the sample chamber, establishing a vacuum environment, starting the refrigeration performance test of the thermoelectric device 30 when the vacuum degree is higher than 10 < -1 > Pa, setting the temperature of the constant temperature table 211 to 25 ℃ and 50 ℃, setting the current step distance to 0.5A and the temperature step distance to 5 ℃, and starting the test.

When the temperature is stable, the direct current power supply starts to output current from 0 according to the set step distance, the current and refrigeration temperature difference are recorded in the process, and a relation curve of the refrigeration temperature difference and the current is drawn, as shown in fig. 8, the optimal working current of a sample obtained from the graph is 3A, and the maximum temperature difference corresponding to the cold side temperature of 25 ℃ and 50 ℃ is 62 ℃ and 73 ℃ respectively.

Then, the maximum refrigerating capacity and refrigerating efficiency are tested, a sample chamber is opened, a heat flow meter 222, a heat source 223 and a heat insulation block are mounted on a sample frame, a pressing mechanism is started, the pressure is set to be 30kg, the test atmosphere is reestablished, the direct current power supply is controlled to output the optimal working current 3A, a data collector works, when the temperature is stable, the heat source 223 is controlled to start heating according to the set step distance value, in the heating process, the input power, the refrigerating capacity and the temperature difference are recorded, the relation between the temperature difference and the refrigerating capacity and the refrigerating efficiency and the temperature difference is drawn as shown in fig. 9 and 10, and the maximum refrigerating capacity of the thermoelectric device 30 is obtained by linearly fitting the refrigerating capacity and the temperature difference curve at 25 ℃ and 50 ℃ respectively.

While the foregoing has described in detail the aspects of the present application, specific examples have been presented herein to illustrate the principles and embodiments of the present application, the above examples are provided solely to assist in the understanding of the methods of the present application and their core concepts; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Reference throughout this specification to "one embodiment," "an embodiment," or "a particular embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment, and not necessarily all embodiments, of the present application. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics of any specific embodiment of the present application may be combined in any suitable manner with one or more other embodiments. It is to be understood that other variations and modifications of the embodiments of the application described and illustrated herein are possible in light of the teachings herein and are to be considered as part of the spirit and scope of the present application.

It will also be appreciated that one or more of the elements shown in the figures may also be implemented in a more separated or integrated manner, or even removed because of inoperability in certain circumstances or provided because it may be useful depending on the particular application.

In addition, any labeled arrows in the drawings/figures should be considered only as exemplary, and not limiting, unless otherwise specifically indicated. Furthermore, the term "or" as used herein is generally intended to mean "and/or" unless specified otherwise. Combinations of parts or steps will also be considered as being noted where terminology is foreseen as rendering the ability to separate or combine is unclear.

Claims (13)

1. The utility model provides a thermoelectric device refrigerating performance test system, includes measuring element, power supply unit and sample platform, the sample platform is used for the centre gripping thermoelectric device that awaits measuring, power supply unit with thermoelectric device that awaits measuring constitutes test loop in order to divide into hot junction and cold junction with the both ends of thermoelectric device that awaits measuring, its characterized in that:

the sample stage comprises a constant temperature part for keeping the temperature of the hot end of the thermoelectric device constant and a movable temperature part for selectively providing heat for the cold end of the thermoelectric device, the hot end of the thermoelectric device to be tested is abutted to the constant temperature part, the cold end of the thermoelectric device to be tested is abutted to the movable temperature part, the measuring unit is respectively connected with the constant temperature part, the thermoelectric device to be tested and the movable temperature part for collecting refrigeration parameters of the thermoelectric device to be tested, wherein

The measuring unit realizes the test of the refrigerating capacity of the thermoelectric device by utilizing the temperature difference between the first temperature and the second temperature of the movable temperature part at least 2 positions away from the thermoelectric device.

2. The system according to claim 1, wherein the temperature-varying part is provided with a first hole at a side close to the cold end of the to-be-measured thermoelectric device, and a second hole at a side far from the cold end of the to-be-measured thermoelectric device, and the first hole and the second hole are respectively connected with the measuring unit to obtain a first temperature and a second temperature, so as to realize calculation of the refrigerating capacity of the to-be-measured thermoelectric device.

3. The refrigeration performance test system of a thermoelectric device according to claim 1 or 2, wherein the refrigeration capacity of the thermoelectric device to be tested is obtained by calculation by the following formula,

，

wherein λ is a material thermal conductivity of the movable temperature portion; delta T is the difference between the first temperature and the second temperature on the movable temperature part; w is the length of the cross section of the movable temperature part; l is the sectional area width of the movable temperature part; and H is the distance between the first hole and the second hole on the movable temperature part.

4. A thermoelectric device refrigerating performance test system as set forth in claims 1 to 3, wherein said movable temperature section comprises a temperature measuring block, a heat flow meter and a heat source, said movable temperature section is connected with said temperature measuring block through one side of said heat flow meter, the other side of said heat flow meter is connected with said heat source, said movable temperature section is abutted with a cold end of said thermoelectric device to be tested through said temperature measuring block, wherein

The heat source can provide heat for the cold end of the thermoelectric device to be measured so that the temperature of the cold end and the hot end of the thermoelectric device to be measured are the same, and the measuring unit obtains the refrigerating capacity of the thermoelectric device to be measured based on the temperature values of the heat flow meter at different positions away from the thermoelectric device to be measured.

5. The system according to any one of claims 1 to 4, wherein the refrigeration parameter includes refrigeration efficiency, the measurement unit is connected to the thermoelectric device to be measured for measuring input power of the thermoelectric device to be measured, wherein

The measuring unit obtains the refrigerating efficiency of the thermoelectric device to be measured based on the input power and the refrigerating capacity of the thermoelectric device to be measured.

6. The system according to claim 4 or 5, wherein the cross-sectional dimensions of the temperature measuring block and the heat flow meter are identical to the cold end dimensions of the thermoelectric device to be measured.

7. The thermoelectric device refrigeration performance test system as set forth in claim 4, further comprising a temperature control unit for controlling the temperature of said thermostat and said heat source, wherein

The temperature control unit has a dual channel PID control to independently control the thermostat and the heat source.

8. The system according to any one of claims 1 to 7, wherein the sample stage further comprises a clamping portion, and the clamping portion is respectively abutted to the constant temperature portion and the dynamic temperature portion to clamp the thermoelectric device to be tested.

9. The thermoelectric device refrigerating performance test system as recited in claim 8, wherein said holding portion comprises a frame, a drive shaft and a driver for driving said drive shaft to move in a set direction, wherein

The frame body comprises an upper pressing plate, an upper supporting rod and a base plate, wherein the upper pressing plate is movably connected with the base plate through the upper supporting rod, the constant temperature part is used for sequentially stacking the thermoelectric device to be tested and the movable temperature part on the base plate, the upper pressing plate is abutted to the movable temperature part, and the transmission shaft penetrates through the base plate and is abutted to the constant temperature part.

10. The refrigeration performance test system of a thermoelectric device according to claim 8 or 9, wherein said holding portion further comprises a bellows which is sleeved on said driving shaft provided between said base plate and said driver, wherein

The corrugated pipe, the base plate and the driver are all sealed and fixed.

11. The system according to any one of claims 1 to 10, wherein the refrigerating performance includes a maximum temperature difference, a maximum refrigerating capacity and a refrigerating efficiency, wherein

When the refrigeration performance testing system of the thermoelectric device is in a state of testing the maximum refrigeration capacity or the refrigeration efficiency, the temperature-varying part provides heat for the cold end of the thermoelectric device.

12. The system of claim 11, further comprising an atmosphere unit for providing a test atmosphere for the thermoelectric device.

13. A method for testing the refrigerating performance of a thermoelectric device, characterized in that the refrigerating performance testing system of the thermoelectric device according to any one of claims 1 to 12 is used for testing, the testing method comprises the following steps:

setting a thermoelectric device to be tested on a sample table, so that the thermoelectric device to be tested is abutted with the constant temperature part and the movable temperature part, and electrically connecting the thermoelectric device to be tested with the power supply unit and the measuring unit;

the constant temperature part is adjusted to be at a set temperature, refrigeration temperature difference values under different current values are obtained, and the maximum temperature difference value and the optimal working current are determined;

and adjusting the power supply unit to an optimal working current state, and providing heat for the cold end of the thermoelectric device by adjusting the temperature-moving part so as to enable the temperature of the cold end and the hot end of the thermoelectric device to be detected to be the same, acquiring data of refrigerating capacity and input electric power under different temperature differences, and determining the maximum refrigerating capacity and refrigerating efficiency.