A vacuum thermoelectric performance testing system

Abstract

The present invention relates to the field of thermoelectric testing technology, and specifically discloses a vacuum thermoelectric performance testing system. The system includes a swing module, an air pressure module, a thermal module, a test module, and a measurement and control module, wherein the tested thermoelectric device in the test module is arranged in a closed test box; the test box is provided with a swing module to provide different tangential forces for the test box; the test box is provided with an air pressure module to provide a vacuum environment that meets the test requirements for the test box; the test box is provided with a thermal module to provide a heat source and a cold source circuit for the tested thermoelectric device by using the thermal module; the measurement and control module is connected to the above modules for data collection, storage, and movement and control of each module. The system can realize the testing of parameters such as the comprehensive thermal resistance, maximum output power, and maximum energy conversion efficiency of multilayer composite thermoelectric devices under actual use conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of thermoelectric testing, and in particular relates to a vacuum thermoelectric performance testing system. Background Art

[0002] Thermoelectric devices are energy conversion devices that can convert thermal energy into electrical energy based on the Seeback effect and the Paltier effect. Such devices have attracted much attention due to their low noise, long life and high reliability. The maximum energy conversion efficiency and maximum output power are the main performance indicators of thermoelectric devices. Current research mainly focuses on the performance testing and evaluation of single devices. Due to the limitations of the current device preparation process and materials, most single thermoelectric devices have a small area and a conversion efficiency of less than 10%. In the design of high-power thermoelectric devices, multi-layer thermoelectric devices are used in combination to improve the overall device efficiency. The energy conversion efficiency and maximum output power of multi-layer composite thermoelectric devices are not simply the superposition of the performance of single-layer devices. Therefore, it is necessary to study the performance of multi-layer composite thermoelectric devices to provide technical support for the engineering application of high-power thermoelectric devices. Based on the performance measurement principle of thermoelectric devices, the present invention simulates the actual use conditions of multi-layer composite thermoelectric devices, completes multiple performance tests of thermoelectric element devices, and at the same time, has the conditions for carrying out device aging assessment tests. Summary of the invention

[0003] The purpose of the present invention is to provide a vacuum thermoelectric performance testing system, which can solve the test of parameters such as comprehensive thermal resistance, maximum output power and maximum energy conversion efficiency of multilayer composite thermoelectric devices under actual use conditions.

[0004] The technical solution of the present invention is as follows: a vacuum thermoelectric performance testing system, the system includes a swing module, an air pressure module, a thermal module, a test module and a measurement and control module, wherein the test thermoelectric device in the test module is arranged in a closed test box; the test box is provided with a swing module to provide different tangential forces for the test box; the test box is provided with an air pressure module to provide a vacuum environment that meets the test requirements for the test box; the test box is provided with a thermal module to provide a heat source and a cold source circuit for the test thermoelectric device; the measurement and control module is connected to the above-mentioned modules for data acquisition, storage, and movement and control of each module.

[0005] The thermal module includes a heat flow circuit, wherein the heat flow circuit includes a heat source, a heater, a heat circulation pump and a heat source water tank, wherein the heat source located on the tested thermoelectric device is connected in series with the heater and the heat circulation pump in sequence to form a circuit, and a heat source water tank is connected in parallel at both ends of the heat circulation pump.

[0006] The thermal module includes a cooling circuit, wherein the cooling circuit includes a cooler, a waste liquid collection tank, a cold source water tank and a cold circulation pump, the cooler, the waste liquid collection tank, the cold source water tank and the cold circulation pump are connected in series in sequence and connected to the cold source body on the tested thermoelectric device; the cold source water tank is an open structure, and a cold source is replenished into it by a water supply pump connected thereto.

[0007] Gate valves are arranged in parallel at both ends of the cooler; and a stop valve is also arranged between the waste liquid collecting tank and the cold source water tank.

[0008] The test module includes a pneumatic clamping table, a slide rail and a pneumatic lifting table, wherein the tested thermoelectric device is fixedly installed inside the test box through the pneumatic clamping table, a slide rail is provided in the test box above the tested thermoelectric device, and a plurality of movable interfaces are installed on the slide rail, the movable interface is connected to the fixed interface on the test box through a hose, and can move within the range of the slide rail; the movable interface includes a cold source interface, a heat source interface and an electrical interface, which are respectively connected to the cold source circuit, the heat source circuit in the thermal module, and each circuit of the test box; the pneumatic lifting table is arranged at the bottom of the test box, and the cold source body and the heat source body are supported and positioned by the supporting slider on the pneumatic lifting table, and are in full contact with the tested thermoelectric device.

[0009] The test module includes a pneumatic clamping table and a slide rail, wherein the tested thermoelectric device is fixedly installed inside a test box through a pneumatic clamping table, a slide rail is provided in the test box above the tested thermoelectric device, and a plurality of movable interfaces are installed on the slide rail, the movable interface is connected to the fixed interface on the test box through a hose, and can be moved within the range of the slide rail; the movable interface includes a cold source interface, a hot source interface and an electrical interface, which are respectively connected to the cold source circuit, the hot source circuit in the thermal module, and each circuit of the test box; the cold source body and the hot source body can be hung on the movable interface, and clamped by a pneumatic clamping table, so that the tested thermoelectric device is in full contact with the cold source body and the hot source body.

[0010] A pneumatic lifting platform is provided on both sides of the left and right sides of the bottom of the test box, and the supporting slider is arranged in the slide rail of the pneumatic lifting platform; the pneumatic lifting platform is connected to the piston cylinder outside the test box through an air pipe, and the piston cylinder is connected to the air pressure generating device through a pneumatic control valve and a pneumatic reducing valve, and a pressure stabilizing and purifying device is provided at the outlet of the air pressure generating device.

[0011] The swing module includes a supporting platform, a telescopic column and an air source, wherein the test box is installed on the supporting platform, and the side walls of the supporting platform are provided with siderails to firmly connect the test box and the supporting platform; the telescopic column is fixedly connected to the bottom of the supporting platform through an upper connecting hinge, and the lower end of the telescopic column is connected to the base through a lower connecting hinge; the telescopic column is connected to a piston cylinder and a regulating valve, and is connected to the air source through an air pipeline.

[0012] The air pressure module includes a box pressure measuring element and a vacuum pump, wherein sealing pads are provided around the test box, and the vacuum pump is connected to the test box through a stop valve and a check valve in sequence, and the action of the vacuum pump is controlled by using the signal feedback from the box pressure measuring element installed on the test box, thereby adjusting the air pressure in the test box so that the test box meets the vacuum requirements of the test.

[0013] The thermal module includes an electric heating film loop to provide a heat source for the tested thermoelectric device; the electric heating film loop includes an electric heating film, an ammeter, a DC voltage-stabilized power supply and an adjustable resistor, wherein the electric heating film is coated on the tested thermoelectric device, and the electric heating film uses a heating wire to connect the ammeter, the DC voltage-stabilized power supply and the high-precision adjustable resistor in series to form a power-on loop to provide heating power for the electric heating film, and a voltage measuring element is installed at both ends of the electric heating film to connect the voltage measuring element in parallel with the ammeter, the DC voltage-stabilized power supply and the adjustable resistor.

[0014] The remarkable effects of the present invention are as follows: the vacuum thermoelectric performance testing system described in the present invention can simulate swing conditions and provide reliability testing of thermoelectric devices during use under different tangential forces; by using adjustable settings of air pressure and clamping force, performance change curves between multilayer composite thermoelectric devices under different conditions can be provided; at the same time, slide rails and flexible joints are used to effectively realize the spacing arrangement of cold and heat sources and test devices, and the thermal energy of the heat source is fully utilized to reduce heat loss and improve measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of a vacuum thermoelectric performance testing system according to the present invention;

[0016] Figure 2 A schematic diagram of the structure of a swing module in a vacuum thermoelectric performance testing system according to the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of an air pressure module in a vacuum thermoelectric performance testing system according to the present invention;

[0018] Figure 4 This is a schematic diagram of the structure of a thermal module in a vacuum thermoelectric performance testing system according to the present invention;

[0019] Figure 5 A schematic diagram of the structure of a test module in a vacuum thermoelectric performance test system according to the present invention;

[0020] In the figure: 1. Swing module; 2. Air pressure module; 3. Thermal module; 4. Test module; 5. Measurement and control module; 6. Support platform; 7. Side rail; 8. Test box; 9. Telescopic column; 10. Piston cylinder; 11. Pneumatic regulating valve; 12. Air source; 13. Vacuum pump; 14. Stop valve; 15. Check valve; 16. Box pressure measuring element; 17. Heat source heating wire; 18. Current measuring element; 19. DC regulated power supply; 20. Adjustable resistor; 21. Voltage measuring element; 22. Heat source pipeline; 23. Regulating valve; 24. Heater; 25. Check valve; 26. Heat Circulation pump; 27. Heat source water tank; 28. Gate valve; 29. ​​Cooler; 30. Waste liquid collection box; 31. Stop valve; 32. Cold source water tank; 33. Water supply pump; 34. Cold circulation pump; 35. Heat source body; 36. Cold source body; 37. Slide rail; 38. Movable interface; 39. Piston cylinder; 40. Support slider; 41. Pneumatic lifting platform; 42. Pneumatic control valve; 43. Pneumatic pressure reducing valve; 44. Pressure stabilizing and purification device; 45. Air pressure generating device; 46. Tested thermoelectric device; 47. Pneumatic clamping platform; 48. Cold source interface; 49. Electrical interface; 50. Heat source interface. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] like Figure 1 As shown, a vacuum thermoelectric performance test system includes a swing module 1, an air pressure module 2, a thermal module 3, a test module 4 and a measurement and control module 5, wherein the test module 4 is mainly installed in a test box 8, and the air pressure module 2 is arranged on the test box 8 to provide a vacuum environment that meets the test requirements for the test box 8; a swing module 1 is installed at the lower end of the test box 8 to provide different tangential forces for the test box 8 to simulate the use process of the thermoelectric device; the measurement and control module 5 is connected with each module to realize data acquisition, storage, and system operation, control and other functions;

[0023] like Figure 2As shown, the swing module 1 includes a support platform 6, a telescopic column 9 and an air source 12, wherein the test box 8 is installed on the support platform 6, and the side wall of the support platform 6 is provided with a side rail 7 to firmly connect the test box 8 to the support platform 6; 6 telescopic columns 9 are fixedly connected to the bottom of the support platform 6 through three upper connecting hinges, and the lower end of the telescopic column 9 is connected to the base through a lower connecting hinge, wherein each telescopic column 9 is connected to a piston cylinder 10 and a regulating valve 11, and is connected to the air source 12 through an air pipeline; the piston cylinder 10 and the regulating valve 11 independently configured for each telescopic column 9 are used to adjust the telescopic length of different telescopic columns 9; the swing module 1 is used to simulate ship conditions to study the influence of swing on the performance of multi-layer composite thermoelectric devices;

[0024] like Figure 3 As shown, the air pressure module 2 includes a box pressure measuring element 16 and a vacuum pump 13, wherein a sealing rubber pad is provided around the test box 8, and the vacuum pump 13 is connected to the test box 8 through a stop valve 14 and a check valve 15 in sequence, and the action of the vacuum pump 13 is controlled by using the feedback signal of the box pressure measuring element 16 installed on the test box 8, thereby adjusting the air pressure in the test box 8 so that the test box 8 meets the vacuum degree requirement of the test;

[0025] like Figure 4As shown, the thermal module 3 includes an electric heating film circuit, a heat flow circuit and a cooling circuit, wherein the electric heating film circuit includes an electric heating film, an ammeter 18, a DC voltage-stabilized power supply 19 and an adjustable resistor 20, wherein the electric heating film is coated on the tested thermoelectric device 46 located in the test box 8, and the electric heating film uses a heating wire 17 to connect the ammeter 18, the DC voltage-stabilized power supply 19 and the high-precision adjustable resistor 20 in series to form a power-on circuit to provide heating power for the electric heating film, and a voltage measuring element 21 is installed at both ends of the electric heating film so that the voltage measuring element 21 is connected to the electric The heat flow meter 18, the DC voltage-stabilized power supply 19, and the adjustable resistor 20 are connected in parallel; the heat flow loop includes a heat source body 35, a heater 24, a heat circulation pump 26, and a heat source water tank 27, wherein the heat flow block heat source body 35 located on the tested thermoelectric device 46 provides a heat source through a heat source pipeline 22, the heat circulation pump 26, the heater 24 and the heat source body 35 are connected in series, and a heat source water tank 27 is connected in parallel to the heat source pipeline 22 at both ends of the heat circulation pump 26, and the heat source water tank is used to provide a circulating medium for the heat flow loop, and the circulating medium provided by the heat source water tank 27 is heated to the operating temperature by the electric heater 24 and flows into the heat source water tank 27. The source body 35 converts part of the heat energy into electrical energy, and the medium that loses part of the heat energy returns to the inlet of the heat circulation pump 26; a regulating valve 23 is also installed on the heat source pipeline 22 to adjust the medium flow and control the heat source input; the cooling circuit includes a cold source body 36, a cooler 29, a cold source water tank 32 and a cold circulation pump 34, wherein the cooler 29, the waste liquid collection tank 30, the cold source water tank 32 and the cold circulation pump 34 are connected in series in sequence and connected to the cold source body 36 installed on the tested thermoelectric device 46, and tap water is used as a cold source, which is connected to the cold source water tank 32 through the upper water pump 33, and the cold source water The box 32 is open-ended, and a water supply pump 33 is used to supply a cold source to it; gate valves 28 are connected in parallel at both ends of the cooler 29, and a stop valve 31 is installed between the waste liquid collection box 30 and the cold source water tank 32; a cold circulation pump 34 injects the cooling water in the cold source water tank 32 into the cold source body 36, and the cooling water absorbs heat in the cold source body 36 and is then recycled to the waste liquid collection box 30, and a circulating flow can be selected, that is, the cooling water flows out of the cold source body 36, is cooled by the cooler 29, and then flows back to the waste liquid collection box 30, and the waste liquid collection box 30 is connected to the cold source water tank 32 through the gate valve 31 to form a circulating flow;

[0026] like Figure 5As shown, the test module 4 includes a test thermoelectric device 46, a pneumatic clamping table 47, a slide rail 37 and a pneumatic lifting table 41, wherein the test thermoelectric device 46 is fixedly installed inside the test box 8 through the pneumatic clamping table 47, and a slide rail 37 is fixedly installed in the test box 8 above the test thermoelectric device 46, and a plurality of movable interfaces 38 are installed on the slide rail 37, and the movable interface 38 is connected to the fixed interface on the test box 8 through a hose and can be moved within the range of the slide rail; the movable interface 38 includes a cold source interface 48, a heat source interface 50 and an electrical interface 49; the lighter cold source body 36, the heat source body 35 and the thin film type test thermoelectric device can be suspended through the movable interface 38, pre-positioned, and moved through the pneumatic clamping table 47 Clamp to ensure that the tested thermoelectric device is in full contact with the cold and hot sources; the heavier cold source body 36, heat source body 35 and block thermoelectric material are pre-positioned using the support slider 40 on the pneumatic lifting platform 41 at the bottom of the test box 8, wherein the support slider 40 is installed in the slide rail of the pneumatic lifting platform 41; a pneumatic lifting platform 41 is installed on the left and right sides of the test box 8, which is connected to the piston cylinder 39 located outside the test box 8 through an air pipe, and the piston cylinder 39 is connected to the air pressure generating device 45 through a pneumatic control valve 42 and a pneumatic reducing valve 43, and a pressure stabilizing and purification device 44 is provided at the outlet of the air pressure generating device 45; the pneumatic clamping platform 47 is connected to the outlet pipeline of the air pressure generating device 45 through the piston cylinder 39 and the pneumatic control valve.

Claims

1. A vacuum thermoelectric performance testing system, characterized in that: The system comprises a swing module (1), an air pressure module (2), a thermal module (3), a test module (4), and a measurement and control module (5), wherein a test thermoelectric device (46) in the test module (4) is arranged in a sealed test box (8); the test box (8) is provided with a swing module (1) to provide different tangential forces for the test box (8); the test box (8) is provided with an air pressure module (2) to provide a vacuum environment that meets the test requirements for the test box (8); the test box (8) is provided with a thermal module (3) to provide a heat source and a cold source circuit for the test thermoelectric device (46); the measurement and control module (5) is connected to each of the above modules and is used for data acquisition and storage. and the movement and control of each module; the thermal module (3) includes a heat flow circuit, wherein the heat flow circuit includes a heat source body (35), a heater (24), a heat circulation pump (26) and a heat source water tank (27), wherein the heat source body (35) located on the tested thermoelectric device (46) is sequentially connected in series with the heater (24) and the heat circulation pump (26) to form a circuit, and a heat source water tank (27) is connected in parallel at both ends of the heat circulation pump (26); the thermal module (3) includes a cooling circuit, wherein a cooler (29), a waste liquid collection tank (30), a cold source water tank (32) and a cold circulation pump (34) in the cooling circuit are sequentially connected in series and connected to the cold source body (36) on the tested thermoelectric device (46). The cold source water tank (32) is an open structure, and a cold source is added to the cold source by a water supply pump (33) connected thereto; the test module (4) comprises a pneumatic clamping table (47), a slide rail (37) and a pneumatic lifting table (41), wherein the test thermoelectric device (46) is fixedly mounted inside the test box (8) through the pneumatic clamping table (47); a slide rail (37) is provided in the test box (8) above the test thermoelectric device (46), and a plurality of movable interfaces (38) are installed on the slide rail (37); the movable interface (38) is connected to a fixed interface on the test box (8) through a hose, and can move within the range of the slide rail; the movable interface (38) comprises a cold source interface ( 48), a heat source interface (50) and an electrical interface (49), which are respectively connected to the cold source circuit, the heat source circuit and the circuits of the test box (8) in the thermal module (3); the pneumatic lifting platform (41) is arranged at the bottom of the test box (8); the cold source body (36) and the heat source body (35) are supported and positioned by the support slider (40) on the pneumatic lifting platform (41) and are in full contact with the tested thermoelectric device (46); the swing module (1) comprises a support platform (6), a telescopic column (9) and an air source (12), wherein the test box (8) is installed on the support platform (6), and the side wall of the support platform (6) is provided with a side rail (7) to firmly connect the test box (8) and the support platform (6);The telescopic column (9) is fixedly connected to the bottom of the support platform (6) via an upper connecting hinge, and the lower end of the telescopic column (9) is connected to the base via a lower connecting hinge; the telescopic column (9) is connected to a piston cylinder (10) and a regulating valve (11), and is connected to an air source (12) via an air pipeline; the air pressure module (2) comprises a box pressure measuring element (16) and a vacuum pump (13), wherein a sealing rubber pad is provided around the test box (8), the vacuum pump (13) is connected to the test box (8) via a stop valve (14) and a check valve (15) in sequence, and the action of the vacuum pump (13) is controlled by using a signal fed back from the box pressure measuring element (16) installed on the test box (8), thereby adjusting the air pressure in the test box (8) so that the test box (8) meets the vacuum degree requirement of the test. ; 2. A vacuum thermoelectric performance testing system according to claim 1, characterized in that: Gate valves (28) are provided in parallel at both ends of the cooler (29); and a stop valve (31) is also provided between the waste liquid collection tank (30) and the cold source water tank (32).

3. A vacuum thermoelectric performance testing system according to claim 1, characterized in that: A cold source body (36) and a heat source body (35) can be suspended on the movable interface (38) and clamped by a pneumatic clamping platform (47) so that the tested thermoelectric device (46) is in full contact with the cold source body (36) and the heat source body (35).

4. A vacuum thermoelectric performance testing system according to claim 1, characterized in that: A pneumatic lifting platform (41) is provided on both sides of the bottom of the test box (8), and the supporting slide block (40) is arranged in the slide rail of the pneumatic lifting platform (41); the pneumatic lifting platform (41) is connected to the piston cylinder (39) located outside the test box (8) through an air pipe, and the piston cylinder (39) is connected to the air pressure generating device (45) through a pneumatic control valve (42) and a pneumatic pressure reducing valve (43), and a pressure stabilizing and purifying device (44) is provided at the outlet of the air pressure generating device (45).

5. A vacuum thermoelectric performance testing system according to claim 1, characterized in that: The thermal module (3) includes an electric heating film loop to provide a heat source for the tested thermoelectric device (46); the electric heating film loop includes an electric heating film, an ammeter (18), a DC voltage-stabilized power supply (19) and an adjustable resistor (20), wherein the electric heating film is coated on the tested thermoelectric device (46), and the electric heating film uses a heating wire (17) to connect the ammeter (18), the DC voltage-stabilized power supply (19) and the high-precision adjustable resistor (20) in series to form an energized loop to provide heating power for the electric heating film, and a voltage measuring element (21) is installed at both ends of the electric heating film so that the voltage measuring element (21) is connected in parallel with the ammeter (18), the DC voltage-stabilized power supply (19) and the adjustable resistor (20).

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