A thermoelectric power generation efficiency testing device with adaptive pressure control function

Abstract

The application provides a thermoelectric power generation efficiency testing device with an adaptive pressure control function, which adopts a flexible heater structure with a supporting suspension and a leveling spring, can effectively solve the problem that the upper and lower end surfaces of a thermoelectric device are insufficiently contacted with a heating table and a refrigeration table during power generation performance testing, adopts an automatic pressure control system such as a pressure sensor and an overhead hydraulic cylinder, and realizes smooth and accurate control of the required pressure for the power generation performance testing of the thermoelectric device. Meanwhile, the heater module, the refrigeration table, the cold end water cooling plate and other structures are integrated in a vacuum sealed cavity, during testing, the cavity can be efficiently pumped, the multi-pipe cooling system in the cavity can realize the purpose of rapid cooling after testing. The application has great application value, scientific research and experimental value for the power generation performance testing of the thermoelectric device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of thermoelectric conversion, and particularly relates to a thermoelectric power generation efficiency testing device with self-adaptive pressure control function. BACKGROUND

[0002] Currently, the heating table and the refrigeration table of the device for measuring the power generation performance of a thermoelectric device are of a fixed flat structure, and the upper and lower substrates of the device cannot be guaranteed to be in full contact with the heating table and the refrigeration table during the device testing. In order to avoid the adverse effects caused by insufficient contact as much as possible, a layer of graphite paper is usually placed between the device and the heating table and the refrigeration table to ensure accurate temperature control and uniform pressure.

[0003] Chinese patent CN107607849A discloses a device and method for testing the power generation performance of a thermoelectric device, which is characterized in that the thermoelectric device is placed between a hot-end temperature control platform and a cold-end temperature control platform, and then the power generation performance of the sample is tested by manually adjusting the pressure through a screw rod. However, the pressure adjustment operation is inconvenient and inefficient. Moreover, the hot-end temperature control platform and the cold-end temperature control platform are of a horizontal flat structure. Since there are slight size deviations and thermal deformations in the manufacturing of the component structures (semiconductor material, barrier layer, solder, electrode, and ceramic substrate) of the device, it is difficult to guarantee the absolute parallelism of the upper and lower end surfaces of the device under actual working conditions. Therefore, during the performance testing, the device cannot be guaranteed to be in flat contact with the cold-end and hot-end heaters, which affects the accuracy of the temperature and pressure and results in large testing data errors.

[0004] Therefore, there is still an urgent need for a device for testing the power generation performance of a thermoelectric device, which can automatically and flexibly adapt to the structure of the thermoelectric device to guarantee the flat contact between the heating table and the refrigeration table and the end surface of the device and reduce the measurement errors. SUMMARY

[0005] To solve the above technical problems, the present application provides a thermoelectric power generation efficiency testing device with self-adaptive pressure control function.

[0006] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The application provides a thermoelectric power generation efficiency testing device with adaptive pressure control function, which comprises a vacuum sealed cavity, a refrigeration system and a heater module arranged in the vacuum sealed cavity; the refrigeration system comprises a refrigeration table, a cold end thermocouple, a first heat flow meter thermocouple and a second heat flow meter thermocouple connected with the refrigeration table respectively, the refrigeration table is used for placing a thermoelectric device to be tested and refrigerating the thermoelectric device to be tested, the cold end thermocouple is used for collecting the temperature of the refrigeration table in real time, and the first heat flow meter thermocouple and the second heat flow meter thermocouple are used for estimating the total heat flow into the thermoelectric device to be tested according to Fourier's law; the heater module is connected with a hydraulic system, and the heater module moves close to or away from the refrigeration table under the control of the hydraulic system; the heater module comprises a heating table arranged opposite to the refrigeration table, and the heating table is used for heating the thermoelectric device to be tested; the heating table is further connected with a hot end thermocouple, and the hot end thermocouple is used for collecting the temperature of the heating table in real time; the heating table is further connected with an elastic leveling assembly, and the heating table presses the upper base surface of the thermoelectric device to be tested under the cooperation of the hydraulic system and the elastic leveling assembly, so that the upper base surface and the lower base surface of the thermoelectric device to be tested are tightly attached between the heating table and the refrigeration table; the device further comprises a data collector connected with the cold end thermocouple and the hot end thermocouple, the data collector is used for receiving the temperature data transmitted by the cold end thermocouple and the hot end thermocouple, and the heat flow data transmitted by the first heat flow meter thermocouple and the second heat flow meter thermocouple, and recording the internal resistance, open circuit voltage, maximum output power and maximum conversion efficiency of the thermoelectric device to be tested at the corresponding temperature when the vacuum sealed cavity is in a vacuum state.

[0008] Further, the heater module comprises a heater support frame, a support suspension, a heater and a heating table connected in sequence; the heater support frame is connected with the hydraulic system; the heater support frame and the support suspension are connected through the elastic leveling assembly, a first connecting piece is arranged on one side edge corner of the heating table close to the heater support frame, and a second connecting piece is arranged on one side edge corner of the heating table close to the support suspension; the elastic leveling assembly comprises a spring guide rod, one end of the spring guide rod is formed as a protrusion, the other end of the spring guide rod is fixed on the first connecting piece after penetrating through the second connecting piece, and a leveling spring is sleeved on the spring guide rod; a gap is reserved between the heater support frame and the support suspension through the leveling spring, when the hydraulic system drives the heater support frame to move towards the refrigeration table until the heating table presses the upper base surface of the thermoelectric device to be tested, the leveling spring is contracted and the gap between the heater support frame and the support suspension is reduced.

[0009] Further, the heater support frame is provided with a limit stop on the side away from the heating table; the limit stop is used to limit the movement distance of the heater module when moving away from the refrigeration table under the control of the hydraulic system, so as to avoid the contact between the heater support frame and the inner top of the vacuum sealed cavity.

[0010] Further, the hydraulic system is further connected with a pressure sensor, which is used to collect the pressure on the heater support frame.

[0011] Further, the heating table is made of high thermal conductivity material, preferably aluminum oxide, aluminum nitride or silicon nitride ceramic.

[0012] Further, the refrigeration system further comprises a cold end water cooling plate for controlling the temperature of the refrigeration table.

[0013] Further, the device further comprises a cavity cooling system connected with the vacuum sealed cavity; the cavity wall of the vacuum sealed cavity is a hollow structure, which is used to accommodate the circulating cooling liquid of the cavity cooling system to flow in and / or flow out.

[0014] Further, the bottom of the vacuum sealed cavity is provided with at least one liquid inlet, and the top is provided with at least one liquid outlet; the cavity cooling system is connected with the liquid inlet, so that the circulating cooling liquid is introduced into the vacuum sealed cavity from bottom to top. To achieve the effect of sufficient cooling. Further, the cavity wall of the vacuum sealed cavity is paved with multiple pipelines to improve the cooling rate.

[0015] Further, the vacuum sealed cavity is vacuumized by a vacuum pump to reduce the influence of air convection on the temperature control in the vacuum sealed cavity; the vacuum degree of the vacuum sealed cavity in the test state is within 10Pa.

[0016] Further, the device further comprises an energizing wire, one end of which is connected with the to-be-tested thermoelectric device, and the other end is externally connected with a load, which is used to measure the power generation effect of the to-be-tested thermoelectric device.

[0017] Compared with the prior art, the technical scheme provided by the present application has at least the following advantages:

[0018] The application provides a thermoelectric power generation efficiency testing device with an adaptive pressure control function. BRIEF DESCRIPTION OF DRAWINGS

[0019] One or more embodiments are illustrated by way of example in the figures that form a part of this disclosure and which are illustrative of various embodiments and implementations that can be implemented in view of the teachings provided herein. In the drawings, like numbers refer to like elements unless otherwise noted.

[0020] Figure 1 A structural schematic diagram of a thermoelectric power generation efficiency testing device with an adaptive pressure control function is provided for the embodiments of the application.

[0021] Figure 2 A structural schematic diagram of a heater module in a thermoelectric power generation efficiency testing device with an adaptive pressure control function is provided for the embodiments of the application.

[0022] In the figure, 1 is a refrigeration table, 2 is a cold end thermocouple, 3 is a thermoelectric device to be tested, 4 is a heater module, 5 is a stopper, 6 is a hydraulic system, 7 is a pressure sensor, 8 is a vacuum sealed cavity, 9 is a first heat flow meter thermocouple, 10 is a second heat flow meter thermocouple, 11 is an energizing wire, 12 is a cold end water cooling plate, and 13 is a cavity cooling system.

[0023] 401 is a heating table, 402 is a hot end thermocouple, 403 is a heater, 404 is a heater support frame, 405 is a support suspension, 406 is a spring guide rod, and 407 is a leveling spring. DETAILED DESCRIPTION

[0024] As known from the background art, a thermoelectric device is usually packaged by a structure of a semiconductor thermoelectric material, a barrier layer, a solder, an electrode, a ceramic substrate, etc. In the preparation process of the thermoelectric device, the non-parallelism of the upper and lower substrates of the device is directly caused by the height deviation of the thermoelectric arm, the uneven coverage of the solder, etc. Meanwhile, the non-parallelism of the upper and lower substrates of the device is also caused by the thermal deformation of each component structure of the device at a higher temperature, since the device is usually packaged by high-temperature and high-pressure welding. The heating table and the refrigeration table of the conventional thermoelectric power generation performance testing device are rigid parallel plane structures, which cannot guarantee the flat contact between the heating table, the refrigeration table and the two end surfaces of the thermoelectric device during the power generation performance testing of the thermoelectric device, resulting in a large error of the testing result and the damage of the device under high pressure.

[0025] In view of the above technical defects of the thermoelectric power generation performance testing device, the present application provides a thermoelectric power generation efficiency testing device with self-adaptive pressure control function, which adopts a flexible heater structure with a supporting suspension and a leveling spring, can effectively solve the problem of insufficient contact between the upper and lower end surfaces of the thermoelectric device and the heating table and the refrigeration table during the power generation performance testing, and simultaneously adopts an automatic pressure control system such as a pressure sensor and an overhead hydraulic oil cylinder to realize the smoothness and accurate control of the required pressure during the power generation performance testing of the thermoelectric device. The present application has great application value for the automatic installation and testing of the power generation performance of the thermoelectric device.

[0026] Specifically, the present application is a thermoelectric power generation efficiency testing device with self-adaptive pressure control function. The flexible heater structure with a supporting suspension and a leveling spring can effectively solve the problem of insufficient contact between the upper and lower end surfaces of the thermoelectric device and the heating table and the refrigeration table during the power generation performance testing, and simultaneously the automatic pressure control system such as a pressure sensor and an overhead hydraulic oil cylinder is adopted to realize the smoothness and accurate control of the required pressure during the power generation performance testing of the thermoelectric device.

[0027] More specifically, the basic scheme of the present application comprises: a thermoelectric power generation efficiency testing device with adaptive pressure control function, comprising a refrigeration table, a cold end thermocouple, a to-be-tested thermoelectric device, a hot end thermocouple, a heater module, a position limiter, a hydraulic system, a pressure sensor, a data collector, a computer, a vacuum sealed cavity, a cold end support plate, a first heat flow meter thermocouple, a second heat flow meter thermocouple, a power connection, a support rod, a cold end water cooling plate, and a cavity cooling system. The heater module comprises a heating table, a hot end thermocouple, a heater, a heater support frame, a support suspension, a spring guide rod, and a leveling spring. The temperature control device (the heater module, the refrigeration table, etc.) and the to-be-tested device and the cold end water cooling plate are placed in the vacuum sealed cavity, and a vacuum pump is used for vacuumizing to reduce the influence of air convection on the temperature control system. The to-be-tested device is placed between the heating table and the refrigeration table, and the hydraulic system and the pressure sensor are used for automatically clamping and controlling the to-be-tested device; at the same time, the heater module is adaptively adjusted to make the heating table and the device end surface in flat contact under the action of the support suspension and the leveling spring. The positive and negative electrodes of the to-be-tested device are connected to the power connection of the equipment by lead wires. The hot end thermocouple and the cold end thermocouple collect the temperatures of the heating table and the refrigeration table in real time and transmit them to the data collector. After setting the temperature of the temperature control table, the vacuum pump is turned on to vacuumize the test cavity. After setting the program, the computer automatically records the internal resistance, the open circuit voltage, the maximum output power and the maximum conversion efficiency of the device at the corresponding temperature.

[0028] The present application will be described in detail below in conjunction with the specific embodiments.

[0029] The present application is a thermoelectric power generation efficiency testing device with adaptive pressure control function, which comprises a vacuum sealed cavity 8, and a refrigeration system and a heater module 4 arranged in the vacuum sealed cavity 8.

[0030] The refrigeration system comprises a refrigeration table 1, a cold end thermocouple 2, a first heat flow meter thermocouple 9 and a second heat flow meter thermocouple 10 connected to the refrigeration table 1 respectively, the refrigeration table 1 is used for placing a to-be-tested thermoelectric device 3 and refrigerating the to-be-tested thermoelectric device 3, the cold end thermocouple 2 is used for collecting the temperature of the refrigeration table 1 in real time, and the first heat flow meter thermocouple 9 and the second heat flow meter thermocouple 10 are used for estimating the total heat flow into the to-be-tested thermoelectric device according to Fourier's law.

[0031] The heater module 4 is connected with a hydraulic system 6, and the heater module 4 moves close to / distant from the refrigeration table 1 under the control of the hydraulic system 6.

[0032] The heater module 4 comprises a heating table 401 arranged opposite to the refrigeration table 1, and the heating table 401 is used for heating the to-be-tested thermoelectric device 3; the heating table 401 is further connected with a hot-end thermocouple 402, and the hot-end thermocouple 402 is used for collecting the temperature of the heating table 401 in real time.

[0033] The heating table 401 is further connected with an elastic leveling assembly, and the heating table 401 is pressed against the upper base surface of the to-be-tested thermoelectric device 3 under the cooperation of the hydraulic system 6 and the elastic leveling assembly, so that the upper base surface and the lower base surface of the to-be-tested thermoelectric device 3 are tightly attached between the heating table 401 and the refrigeration table 1.

[0034] The device further comprises a data collector connected with the cold-end thermocouple 2 and the hot-end thermocouple 402, and the data collector is used for receiving the temperature data transmitted by the cold-end thermocouple 2 and the hot-end thermocouple 402, and the heat flow data transmitted by the first heat flow meter thermocouple 9 and the second heat flow meter thermocouple 10, and recording the internal resistance, open-circuit voltage, maximum output power and maximum conversion efficiency of the to-be-tested thermoelectric device 3 at the corresponding temperature when the vacuum sealed cavity 8 is in a vacuum state.

[0035] The device further comprises a data collector connected with the cold-end thermocouple 2 and the hot-end thermocouple 402, and the data collector is used for receiving the temperature data transmitted by the cold-end thermocouple 2 and the hot-end thermocouple 402, and the heat flow data transmitted by the first heat flow meter thermocouple 9 and the second heat flow meter thermocouple 10, and recording the internal resistance, open-circuit voltage, maximum output power and maximum conversion efficiency of the to-be-tested thermoelectric device 3 at the corresponding temperature when the vacuum sealed cavity 8 is in a vacuum state.

[0036] The basic measurement device of the present application comprises a heater module 4, a pressure control system, a refrigeration system, a cavity cooling system 13, a vacuum sealed cavity 8, a data collector, a computer and the like.

[0037] The heater module 4 comprises a heater support frame 404, a support suspension 405, a heater and a heating table 401 connected in sequence; and the heater support frame 404 is connected with the hydraulic system 6.

[0038] The heater support frame 404 and the support suspension 405 are connected through the elastic leveling assembly, and the heater support frame 404 is provided with a first connecting piece on one side edge corner close to the heating table 401, and the support suspension 405 is provided with a second connecting piece on one side edge corner of the heating table 401.

[0039] The elastic leveling assembly comprises a spring guide rod 406, one end of the spring guide rod 406 is formed with a protrusion, the other end of the spring guide rod 406 is fixed on the first connecting piece after penetrating through the second connecting piece, and a leveling spring 407 is sleeved on the spring guide rod 406.

[0040] The gap between the heater support frame 404 and the support suspension 405 is reserved by the leveling spring 407. When the hydraulic system 6 drives the heater support frame 404 to move towards the refrigeration table 1 until the heating table 401 presses the upper surface of the thermal device 3 to be tested, the leveling spring 407 is contracted and the gap between the heater support frame 404 and the support suspension 405 is reduced.

[0041] It can be seen that the heater module 4 is composed of a heating table 401, a hot end thermocouple 402, a heater 403, a heater support frame 404, a support suspension 405, a spring guide rod 406, and a leveling spring 407. The temperature range of the heating table 401 is determined by the number of heaters 403.

[0042] The heating table 401 is made of high thermal conductivity materials such as alumina, aluminum nitride, and silicon nitride ceramics.

[0043] The support suspension 405 and the leveling spring 407 have the functions of self-adaptive leveling of the heating table 401 and pressure transmission. It should be noted that the number of leveling springs 407 is generally four, which are arranged at the four corners of the heater support frame 404 and the support suspension 405. When all four leveling springs 407 are in the contracted state, it can be determined that the heating table 401 is tightly attached to the thermal device 3 to be tested.

[0044] The pressure control system is composed of a pressure sensor 7, a gas cylinder, a hydraulic pump, a support rod, a limit stop 5, and a data collector; automatic control of pressure can be realized.

[0045] The limit stop 5 is installed above the heater module 4. When pressure relief, the hydraulic control system raises the hydraulic rod. When the distance from the heater module 4 to the inside of the cavity is 10 cm, the limit stop 5 actively protects the heater module 4 and sends a computer through the data transmission system to issue a warning of the upper limit of the stroke of the heater module 4.

[0046] The refrigeration system is below the heat flow meter thermocouple and includes a cold end water cooling plate 12 for controlling the temperature of the refrigeration table 1.

[0047] The cavity cooling system 13 uses circulating cooling liquid from bottom to top to achieve sufficient cooling effect. At the same time, multiple pipelines are laid inside the cavity to improve the cooling rate of the equipment.

[0048] The vacuum sealed cavity 8 contains the device to be tested, the heater module 4, and the cooling system, making the test device structure simple and compact. At the same time, the cavity structure design fully utilizes the space. When measuring the power generation performance, the vacuum pump can quickly vacuum the cavity to within 10 Pa.

[0049] The application further provides a thermoelectric power generation efficiency testing method with an adaptive pressure control function, comprising the measuring device and the following steps.

[0050] Step 1, the upper and lower end faces of the thermoelectric device to be measured are coated with a heat-conducting adhesive, and are placed between the heating table 401 and the refrigeration table 1 in the vacuum sealed cavity 8.

[0051] Step 2, the pressure control system is started, and the oil press is adaptively pressurized, and the heating module 4 is automatically leveled and kept in stable contact with the end face of the thermoelectric device to be measured through the transmission of the hydraulic rod, and the pressure is clamped and kept at a constant set pressure.

[0052] Step 3, the device is connected with the power connection 11 through a lead wire.

[0053] Step 4, the cavity is closed, and the vacuum pump is turned on to pump the cavity to a vacuum of 10 Pa or less.

[0054] Step 5, the automatic control program is used to set the heating temperature range, temperature gradient and corresponding test time.

[0055] Step 6, the program is started to test, and the real-time data measured by the data collector is input into the computer, so that the internal resistance, open circuit voltage, maximum output power and maximum conversion efficiency data and relationship curve diagram of the thermoelectric device to be measured at the corresponding temperature can be directly obtained.

[0056] Step 7, after the test is completed, the cavity cooling system 13 is turned on, so that the temperature in the cavity is quickly reduced to room temperature, and the thermoelectric device to be measured is taken out, and the test is completed.

[0057] Those skilled in the art can understand that the above embodiments are specific examples for implementing the application, and in actual applications, various changes can be made in form and details without departing from the spirit and scope of the application. Any person skilled in the art can make changes and modifications without departing from the spirit and scope of the application, therefore, the protection scope of the application should be limited by the scope defined in the claims.

Claims

1. A thermoelectric power generation efficiency testing device having a self-adapting pressure control function, characterized by, The device comprises a vacuum sealed cavity (8), a refrigeration system and a heater module (4) arranged in the vacuum sealed cavity (8); The refrigeration system comprises a refrigeration table (1) for placing and refrigerating a thermoelectric device (3) to be tested, a cold end thermocouple (2), a first heat flow meter thermocouple (9) and a second heat flow meter thermocouple (10) connected to the refrigeration table (1) respectively, the cold end thermocouple (2) is used to collect the temperature of the refrigeration table (1) in real time, and the first heat flow meter thermocouple (9) and the second heat flow meter thermocouple (10) are used to estimate the total heat flow into the thermoelectric device to be tested according to Fourier's law; The heater module (4) is connected with a hydraulic system (6), and the heater module (4) moves close to or away from the refrigeration table (1) under the control of the hydraulic system (6); The heater module (4) comprises a heating table (401) arranged opposite to the refrigeration table (1), the heating table (401) is used to heat the thermoelectric device (3) to be tested; the heating table (401) is also connected with a hot end thermocouple (402), the hot end thermocouple (402) is used to collect the temperature of the heating table (401) in real time; The heating table (401) is also connected with an elastic leveling assembly, the heating table (401) presses the upper base surface of the thermoelectric device (3) to be tested under the cooperation of the hydraulic system (6) and the elastic leveling assembly, so that the upper base surface and the lower base surface of the thermoelectric device (3) to be tested are tightly attached between the heating table (401) and the refrigeration table (1); The device further comprises a data collector connected with the cold end thermocouple (2) and the hot end thermocouple (402), the data collector is used to receive the temperature data transmitted by the cold end thermocouple (2) and the hot end thermocouple (402), and the heat flow data transmitted by the first heat flow meter thermocouple (9) and the second heat flow meter thermocouple (10), and record the internal resistance, open circuit voltage, maximum output power and maximum conversion efficiency of the thermoelectric device (3) to be tested at the corresponding temperature when the vacuum sealed cavity (8) is in a vacuum state.

2. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The heater module (4) comprises a heater support frame (404), a support suspension (405), a heater (403) and a heating table (401) connected in sequence; the heater support frame (404) is connected with the hydraulic system (6); The heater support frame (404) and the support suspension (405) are connected through the elastic leveling assembly, the heater support frame (404) is provided with a first connecting piece on one side corner close to the heating table (401), and the support suspension (405) is provided with a second connecting piece on one side corner of the heating table (401); The elastic leveling assembly comprises a spring guide rod (406), one end of the spring guide rod (406) is formed as a protrusion, the other end of the spring guide rod (406) passes through the second connecting piece and is fixed on the first connecting piece, and a leveling spring (407) is sleeved on the spring guide rod (406); The gap between the heater support frame (404) and the support suspension (405) is reserved by the leveling spring (407), when the hydraulic system (6) drives the heater support frame (404) to move towards the refrigeration table (1) until the heating table (401) presses the upper base surface of the to-be-tested thermoelectric device (3), the leveling spring (407) is contracted and the gap between the heater support frame (404) and the support suspension (405) is reduced.

3. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 2, characterized in that, The side of the heater support frame (404) away from the heating table (401) is also provided with a limit stop (5). The limit stop (5) is used to limit the movement distance of the heater module (4) when moving away from the refrigeration table (1) under the control of the hydraulic system (6), so as to avoid the contact between the heater support frame (404) and the inner top of the vacuum sealed cavity (8).

4. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 2, characterized in that, The hydraulic system (6) is also connected with a pressure sensor (7), and the pressure sensor (7) is used to collect the pressure on the heater support frame (404).

5. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The heating table (401) is made of high thermal conductivity material, which is alumina, aluminum nitride or silicon nitride ceramic.

6. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The refrigeration system also includes a cold end water cooling plate (12) for controlling the temperature of the refrigeration table (1).

7. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The device also includes a cavity cooling system (13) connected with the vacuum sealed cavity (8); the cavity wall of the vacuum sealed cavity (8) is a hollow structure, and the cavity wall is used to accommodate the inflow and / or outflow of circulating cooling liquid of the cavity cooling system (13).

8. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 7, characterized in that, The bottom of the vacuum sealed cavity (8) is provided with at least one liquid inlet, and the top is provided with at least one liquid outlet; the cavity cooling system (13) is connected with the liquid inlet, so that the vacuum sealed cavity (8) is filled with circulating cooling liquid from bottom to top, achieving the effect of sufficient cooling.

9. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The vacuum sealed cavity (8) is vacuumized by a vacuum pump to reduce the influence of air convection on temperature control in the vacuum sealed cavity (8). The vacuum degree of the vacuum sealed cavity (8) in the test state is within 10 Pa.

10. The thermoelectric power generation efficiency testing device having a self-adaptive pressure control function according to claim 1, characterized in that, The device also includes an energizing wire (11), one end of which is connected with the to-be-tested thermoelectric device (3) and the other end is externally connected with a load, which is used to measure the power generation effect of the to-be-tested thermoelectric device (3).

Images