Resistance element with adjustable resistance value

Abstract

The invention discloses a resistance element with an adjustable resistance value, which is applied to a thermoelectric element testing device and comprises a supporting seat, a first resistor, a second resistor and a third resistor, the resistance tube is provided with a first end and a second end which are oppositely arranged along the axial direction of the resistance tube, the first end and the second end are respectively fixed on the supporting seat, the first end is insulated from the supporting seat, and the second end is used for being connected with the thermoelectric element so as to connect a test current to the resistance tube; the sliding assembly comprises a conductive part and a sliding part which are electrically connected with each other, the resistance tube is arranged in a mounting ring of the sliding part in a penetrating manner, the sliding part is arranged on the resistance tube in a manner of sliding along the axial direction of the resistance tube, and the conductive part is connected with the inner wall surface of the mounting ring and at least partially protrudes out of the inner wall surface to be electrically connected with the resistance tube; and the driving part is arranged on the supporting seat and is used for driving the sliding part to slide on the resistance tube. Due to the fact that the contact area is reduced, the impedance is reduced, and more accurate adjustment can be achieved in the resistance adjusting process.

Description

Technical Field

[0001] This application relates to the field of resistance elements with adjustable resistance values, and particularly to a resistance element with adjustable resistance values. Background Art

[0002] A thermoelectric element is an element that converts thermal energy into electrical energy using the Seebeck effect of thermoelectric materials. It has a wide range of applications in industrial and thermoelectric power generation, automotive exhaust waste heat power generation, and isotope decay heat power generation, and is a key element of the above-mentioned heat difference thermoelectric generators. The output power is an important technical indicator of the thermoelectric element, and its power characteristic curve is an important parameter for the design of various thermoelectric generators and needs to be accurately measured. Usually, a load with a variable resistance value can be used to simulate the external load. By changing its resistance value, the output voltage at different currents can be measured, and thus its power curve can be measured.

[0003] To improve reliability, some thermoelectric generators use thermoelectric elements with a parallel structure. Since the internal resistance of the thermoelectric elements with a parallel structure is generally very small and the output current is large. In the related art, the resistance value of the load with a variable resistance value is usually higher than the internal resistance of such thermoelectric elements. Therefore, the external load resistance and the internal resistance of the thermoelectric element do not match, and the maximum output power and the complete power characteristic curve of the thermoelectric element cannot be measured. Summary of the Invention

[0004] To solve the above technical problems, this application provides a resistance element with adjustable resistance values that can achieve the adjustment of a lower resistance, so that it can be applied to measure the output power and the complete power characteristic curve of the thermoelectric element.

[0005] This application is implemented through the following technical solutions.

[0006] The first aspect of this application provides a resistance element with adjustable resistance values, which is applied to a thermoelectric element testing device. The resistance element with adjustable resistance values includes: a support base; a resistance tube having a first end and a second end disposed opposite to each other along its axial direction, the first end and the second end are respectively fixed to the support base, the first end is insulated from the support base, and the second end is used to connect to the thermoelectric element to introduce a test current into the resistance tube; a sliding assembly including a conductive member and a sliding member that are electrically connected to each other, the resistance tube passes through the mounting ring of the sliding member, and the sliding member is disposed on the resistance tube in a manner that can slide along the axial direction of the resistance tube, the conductive member is connected to the inner wall surface of the mounting ring and at least partially protrudes from the inner wall surface to be electrically connected to the resistance tube; and a driving member disposed on the support base, and the driving member is used to drive the sliding member to slide on the resistance tube.

[0007] In the present application, at least a part of the conductive member protrudes from the inner wall surface of the sliding member, and electrical connection is achieved between the conductive member and the resistance tube. With such an arrangement, compared with the overall electrical connection between the sliding assembly and the resistance tube, the contact area can be reduced. Thus, the overall internal resistance of the resistance element can be decreased, which is more matched with the internal resistance of the actual thermoelectric element with a relatively small internal resistance, and the output power and the complete power characteristic curve of the thermoelectric element can be measured better. At the same time, due to the reduction of the contact area, during the adjustment of the resistance, it can also be adjusted more precisely.

[0008] In some embodiments of the present application, the conductive member is an annular elastic member and the number thereof is multiple. Along the axial direction of the resistance tube, the multiple conductive members are spaced apart and distributed on the inner wall surface of the mounting ring; and / or the conductive member is a spring coil, the spring coil includes multiple layers of conductive coatings, and the coating material of the outermost layer of the spring coil is the same as the coating material of the outermost layer of the resistance tube.

[0009] In the present application, the conductive member is annular, which is beneficial to strengthening the electrical connection between the conductive member and the resistance tube. The conductive member has elasticity, which is beneficial to maintaining a tight electrical connection with the resistance tube during the sliding process of the sliding assembly. The conductive member is provided with multiple ones, which is beneficial to maintaining the electrical connection with the resistance tube during the sliding process of the sliding assembly, making the sliding of the sliding assembly along the resistance tube smoother.

[0010] When current flows through different materials, it will cause an increase in impedance. In the present application, the coating material of the outermost layer of the conductive member is the same as the coating material of the outermost layer of the resistance tube, which is beneficial to reducing the contact resistance between the two and thus reducing the impedance of the resistance element to be applicable to the test of the thermoelectric element.

[0011] In some embodiments of the present application, the driving member includes a motor and a driving rod. The driving rod is connected to the sliding assembly, and the motor drives the sliding assembly to move through the driving rod; the sliding assembly further includes an insulating member. The sliding member is connected to the insulating member, and the insulating member is connected to the driving rod and can move under the drive of the driving rod, thereby driving the sliding member to slide along the resistance tube.

[0012] In the present application, the driving rod moves under the drive of the motor to drive the sliding assembly to move, so that the adjustment of the resistance value can be realized. By adjusting with a motor, it is beneficial to improving the adjustment accuracy.

[0013] In some embodiments of the present application, the resistance element with an adjustable resistance value includes: a guiding rod, the axial direction of the guiding rod is parallel to the axial direction of the resistance tube, and the insulating member is slidably sleeved on the guiding rod.

[0014] The provision of the guide rod enables the sliding component to move along the guide rod when sliding, thereby facilitating the stable sliding of the sliding component, making the change in resistance smooth, precisely adjusting the resistance value, and ensuring the smoothness and accuracy of the test data.

[0015] In some embodiments of the present application, the guide rods are provided as a pair, and the pair of guide rods are symmetrically arranged with the driving rod as the center; the insulating member includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence, the second connecting portion is disposed on the driving rod, and the first connecting portion and the second connecting portion are respectively slidably connected to the pair of guide rods.

[0016] A pair of guide rods is conducive to the stable sliding of the sliding component.

[0017] In some embodiments of the present application, the driving rod is provided as a lead screw, and the axial direction of the lead screw is parallel to the axial direction of the resistance tube; a lead screw nut is provided on the second connecting portion, and the lead screw nut is adapted to the lead screw.

[0018] The sliding component is enabled to move along the resistance tube through the adaptation between the lead screw and the lead screw nut, which can increase the accuracy of resistance adjustment. In addition, the movement in the form of lead screw drive is more stable and has high reliability, and is also conducive to reducing energy consumption.

[0019] In some embodiments of the present application, the support seat includes a base, a first bracket, and a second bracket. The first bracket and the second bracket are arranged at intervals along the axial direction of the resistance tube and supported on the base. The second end is electrically connected to the second bracket, and the first end is insulated from the first bracket; the resistance element with adjustable resistance value includes: a plurality of wiring terminals, and some of the plurality of wiring terminals are disposed on the second bracket for inputting the test current; the sliding member includes a sliding portion and a clamping portion. The sliding portion is disposed on the resistance tube in a manner that can slide along the resistance tube, and the clamping portion clamps the outer periphery of the sliding portion, and the remaining wiring terminals among the plurality of wiring terminals are disposed on the clamping portion for outputting the test current.

[0020] The clamping portion is conducive to fixing the sliding portion and helps to establish a stable connection between the sliding portion and the conductive member.

[0021] In some embodiments of the present application, the driving member is disposed on the support seat, and along the axial direction of the resistance tube, the driving member is disposed near the second end.

[0022] The driving member is disposed near the second end, and the second end accesses the test current, which is convenient for adjusting a smaller resistance value.

[0023] In some embodiments of the present application, the inner wall surface of the mounting ring is coated with an anti-oxidation coating.

[0024] A second aspect of the present application provides a thermoelectric element testing device, characterized by comprising: a housing, which forms a sealed cavity; a resistance element with adjustable resistance as described in any one of the first aspects, disposed in the sealed cavity, and a second end of the resistance element with adjustable resistance is used for electrically connecting with the thermoelectric element.

[0025] In the present application, at least a part of the conductive member protrudes from the inner wall surface of the sliding member, and electrical connection is achieved between the conductive member and the resistance tube. With such a setting, compared with the overall electrical connection between the sliding assembly and the resistance tube, the contact area can be reduced. Thus, the overall internal resistance of the resistance element can be reduced. At the same time, due to the reduction of the contact area, during the adjustment process of the resistance, it can also be adjusted more precisely. Therefore, the thermoelectric element testing device can accurately measure the maximum output power and the complete power characteristic curve of the thermoelectric element. Description of the Drawings

[0026] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0027] Figure 1 It is a schematic diagram of the power characteristic curve of the thermoelectric device;

[0028] Figure 2 It is a three-dimensional structural schematic diagram of a resistance element with adjustable resistance provided by some embodiments of the present application;

[0029] Figure 3 It is a cross-sectional structural schematic diagram of a sliding assembly along the axial direction of the resistance tube provided by some other embodiments of the present application.

[0030] Description of the Reference Numerals

[0031] 1. Insulating tube; 111. First end; 112. Second end; 2. Bearing seat; 201. First bracket; 202. Second bracket; 203. Base; 3. Support seat; 4. Insulating member; 41. First connecting portion; 42. Second connecting portion; 43. Third connecting portion; 5. Linear bearing; 6. Motor; 7. Wiring terminal; 8. Guide rod bracket; 9. Guide rod; 10. Driving rod; 11. Resistance tube; 12. Sliding portion; 13. Clamping portion; 14. Conductive member; 20. Support seat; 100. Resistance element with adjustable resistance. Detailed Embodiments

[0032] The embodiments of the technical solution of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0033] A thermoelectric element is an element that converts thermal energy into electrical energy using the Seebeck effect of thermoelectric materials. It has a wide range of applications in industrial and thermoelectric power generation, automotive exhaust waste heat power generation, and isotope decay heat power generation, and is a key element of the above-mentioned heat differential generators. The output power is an important technical index of thermoelectric elements (thermoelectric devices), and its power characteristic curve, which is an important parameter for the design of various thermoelectric generators, needs to be accurately measured. Its power curve characteristics are as Figure 1 shown. As the load current increases, the output power first increases and then decreases. The output power has a maximum value, and the current-power curve is in a parabolic shape. To the left of the maximum value of the output power, the resistance of the load is greater than the internal resistance of the device, and to the right of the maximum value of the output power, the resistance of the load is less than the internal resistance of the device. When the resistance of the external load is equal to the internal resistance of the device, the device reaches the maximum output power. Generally, a DC electronic load is used to simulate the external load. By changing its resistance value, the output voltage at different currents can be measured, thereby measuring its power curve. For some special thermoelectric generators to improve reliability, the thermoelectric devices generally adopt a parallel structure. Therefore, its internal resistance is generally very small, which can be lower than the milliohm level, and its output current is relatively large, reaching the level of dozens of amperes. However, the minimum load resistance of the existing DC electronic load is often higher than the internal resistance of this type of device. Therefore, the external load resistance and the internal resistance of the device do not match, and the maximum output power and the complete power characteristic curve of the thermoelectric device cannot be measured. Although multiple electronic loads can be connected in parallel to reduce the external load resistance to achieve the matching of the load resistance and the internal resistance of the device, the cost of high-current DC electronic loads is relatively high, resulting in a high test cost.

[0034] To solve the above technical problems, the present application provides a resistance element with adjustable resistance value that can achieve the adjustment of a lower resistance, so that it can be applied to measure the output power and the complete power characteristic curve of thermoelectric elements. Based on the same or similar concept, the present application also provides a thermoelectric element test device including the aforementioned resistance element, and this thermoelectric element test device can accurately measure the maximum output power and the complete power characteristic curve of thermoelectric elements.

[0035] The adjustable-resistance value resistor element provided by the present application is applied to a thermoelectric element testing device. The adjustable-resistance value resistor element includes: a support base; a resistance tube having a first end and a second end disposed opposite to each other along its axial direction, the first end and the second end are respectively fixed to the support base, the first end is insulated from the support base, and the second end is used to connect to a thermoelectric element to pass a test current into the resistance tube; a sliding assembly including a conductive member and a sliding member electrically connected to each other, the resistance tube passes through an installation ring of the sliding member, the sliding member is disposed on the resistance tube in a manner capable of sliding along the axial direction of the resistance tube, the conductive member is connected to the inner wall surface of the installation ring and at least partially protrudes from the inner wall surface to be electrically connected to the resistance tube; and a driving member disposed on the support base, the driving member is used to drive the sliding member to slide on the resistance tube.

[0036] In the present application, at least a part of the conductive member protrudes from the inner wall surface of the sliding member, and electrical connection with the resistance tube is achieved through the conductive member. With such a setting, compared with the overall electrical connection of the sliding assembly to the resistance tube, the contact area can be reduced. Thus, the overall internal resistance of the resistor element can be reduced, which is more matched with the internal resistance of the actual thermoelectric element with a relatively small internal resistance, and the output power and the complete power characteristic curve of the thermoelectric element can be measured better. At the same time, due to the reduction of the contact area, during the adjustment of the resistance, it can also be adjusted more precisely.

[0037] Figure 1 Schematic diagram of the power characteristic curve of the thermoelectric device; Figure 2 Schematic perspective view of the adjustable-resistance value resistor element provided by some embodiments of the present application; Figure 3 Schematic cross-sectional view of the sliding assembly along the axial direction of the resistance tube provided by some other embodiments of the present application.

[0038] As Figure 2 and Figure 3 shown, the adjustable-resistance value resistor element 100 of the present application may include a support base 20, a resistance tube 11, a sliding assembly, and a driving member. The resistance tube 11 is disposed on the support base 20, and the support base 20 supports the resistance tube 11. The sliding assembly is disposed on the resistance tube 11 and can move along the axial direction of the resistance tube 11 under the drive of the driving member.

[0039] As Figure 2 shown, the resistance tube 11 has a first end 111 and a second end 112 along its axial direction. The second end 112 can be used to connect to a thermoelectric element, and a wiring terminal 7 can be provided at the second end 112, and current can flow into the resistance tube 11 through the wiring terminal 7.

[0040] In this application, the material of the resistance tube 11 can be a nickel-based alloy with a suitable resistivity and wear resistance, but this application is not limited thereto. The cross-sectional dimension (in the radial direction) of the resistance tube 11 can be selected according to the internal resistance of the thermoelectric element to be tested. The roundness and straightness of the outer circle of the resistance tube 11 are strictly controlled for geometric tolerances, and the surface is polished. The polished surface of the resistance tube is beneficial to reducing the contact resistance between it and the conductive member 14.

[0041] As Figure 2 shown, the support base 20 can include a base 203, a first bracket 201, and a second bracket 202. The first bracket 201 and the second bracket 202 are arranged at intervals along the axial direction of the resistance tube 11 and supported on the base 203. The second end 112 is electrically connected to the second bracket 202, and the first end 111 is insulated from the first bracket 201. For example, the resistance element 100 with an adjustable resistance value can include an insulating tube 1, and the insulating tube 1 can be arranged between the first end 111 and the first bracket 201 so that the first end 111 and the first bracket 201 are insulated from each other.

[0042] In some embodiments of this application, as Figure 2 shown, the driving member can include a motor 6 and a driving rod 10. The driving rod 10 can be connected to the sliding assembly, and the motor 6 can drive the sliding assembly to move through the driving rod 10. The motor 6 can be fixed on the base 203.

[0043] In some embodiments, the motor 6 can be a stepper motor, but this application is not limited thereto. The stepper motor can accurately adjust the resistance change rate, thereby changing the current change rate, and can realize the power characteristic curve test at different current scanning rates.

[0044] In some embodiments, the driving rod 10 can be a lead screw (threaded rod). The axial direction of the lead screw is parallel to the axial direction of the resistance tube. Both ends of the lead screw can be fixed on the base 203 through bearing seats 2. The lead screw is driven by a motor 6 fixed at one end of the base 203 to drive the sliding assembly to move linearly along the axial direction of the lead screw. The setting of the lead screw is beneficial to accurately controlling the position of the sliding assembly and improving the accuracy of test data. However, this application is not limited thereto. For example, in some embodiments, the driving rod 10 can be a slide bar.

[0045] In some embodiments of this application, the driving member can be arranged on the support base 20. Along the axial direction of the resistance tube, the driving member is arranged close to the second end 112. As Figure 2 shown, compared with the first end 111, the motor 6 is arranged closer to the second end 112.

[0046] The motor 6 is arranged close to the second end 112. The second end 112 is used as the end for accessing the test current, which can facilitate the adjustment of a smaller resistance value.

[0047] In some embodiments of the present application, as Figure 2 shown, the resistive element 100 with adjustable resistance value may include a guide rod 9, and the axial direction of the guide rod 9 is parallel to the axial direction of the resistive tube 11.

[0048] As Figure 2 and Figure 3 shown, the sliding assembly may include a conductive member 14 and a sliding member that are electrically connected to each other. The resistive tube 11 may pass through the mounting ring of the sliding member. The sliding member is arranged on the resistive tube 11 in a manner that it can slide along the axial direction of the resistive tube 11. The conductive member 14 is connected to the inner wall surface of the mounting ring and at least partially protrudes from the inner wall surface to be electrically connected to the resistive tube 11.

[0049] In some embodiments of the present application, the conductive member 14 may be an annular elastic member, and the number thereof is multiple. Along the axial direction of the resistive tube, the multiple conductive members 14 are spaced apart on the inner wall surface of the mounting ring. The annular elastic member is in close contact with the surface of the precision resistive tube, greatly reducing the contact resistance between the sliding assembly and the precision resistive tube. The present application is not limited thereto. In some embodiments, the conductive member 14 may also be in a semi-circular shape, and the contact area between the conductive member 14 and the resistive tube 11 is relatively smaller.

[0050] It should be noted that the present application is not limited thereto. In some embodiments, one conductive member 14 may include multiple conductive members that are not connected to each other, or may include multiple conductive members that are connected to each other. The present application does not make specific limitations.

[0051] In the present application, the conductive member 14 is annular, which is beneficial to strengthening the electrical connection between the conductive member 14 and the resistive tube. The conductive member 14 has elasticity, which is beneficial to maintaining the electrical connection with the resistive tube 11 during the sliding process of the sliding assembly. The conductive member 14 is provided with multiple ones, which is beneficial to maintaining the electrical connection with the resistive tube 11 during the sliding process of the sliding assembly, making the sliding of the sliding assembly along the resistive tube smoother.

[0052] As Figure 3 shown, in some embodiments, the conductive member 14 may be a spring coil. The conductive member 14 may include multiple layers of conductive coatings, and the coating material of the outermost layer of the conductive member 14 is the same as the coating material of the outermost layer of the resistive tube 11.

[0053] For example, the conductive member 14 may be a gold-plated beryllium copper spring coil to form good electrical contact with the outer surface of the precision resistive tube 11. It should be noted that the present application does not limit the specific material of the conductive member.

[0054] When current flows through different materials, it will cause an increase in impedance. In the present application, the coating material of the outermost layer of the conductive member is the same as the coating material of the outermost layer of the resistive tube, which is beneficial to reducing the contact resistance between the two and thus reducing the impedance of the resistive element, so as to be applicable to the test of thermoelectric elements.

[0055] In the present application, the conductive member 14 can be disposed to protrude from the inner wall surface of the mounting ring, so as to separate the sliding member from the resistance tube 11, minimizing their contact as much as possible, thereby reducing the contact area as much as possible to reduce the resistance and achieve precise adjustment of the resistance.

[0056] As Figure 2 shown, the sliding assembly may include an insulating member 4. The sliding member is connected to the insulating member 4, and the insulating member 4 is connected to the driving rod 10 and can move under the drive of the driving rod, thereby driving the sliding member to slide along the resistance tube.

[0057] In the present application, the material of the insulating member 4 can be polyetheretherketone (PEEK for short) engineering plastic. A ball screw nut is installed in the middle of the insulating member 4. Linear bearings 5 are installed on both sides of the insulating member 4. The linear bearings 5 penetrate the corresponding guide rods 9. By providing the linear bearings 5, the friction during sliding can be reduced and the movement accuracy can be improved.

[0058] In the present application, the driving rod moves under the drive of the motor to drive the sliding assembly to move, thereby realizing the adjustment of the resistance value. By adjusting with the motor, it is beneficial to improve the adjustment accuracy.

[0059] In the present application, as Figure 2 shown, the insulating member 4 is slidably sleeved on the guide rod 9. The setting of the guide rod 9 enables the sliding assembly to move along the guide rod 9 when sliding, which helps the sliding assembly to slide stably to precisely adjust the resistance value. In some embodiments, the guide rod 9 can be a slide rail or a slideway, but the present application is not limited thereto.

[0060] As Figure 2 shown, the support seat 20 may include a guide rod bracket 8, and the guide rod 9 can be disposed on the guide rod bracket 8.

[0061] In some embodiments of the present application, as Figure 2 shown, the guide rod 9 can be provided as a pair, and the pair of guide rods 9 can be symmetrically arranged with the driving rod 10 as the center.

[0062] A double-track structure is formed by a pair of guide rods 9. Through the double-track structure and the precision nickel-based alloy tube, it can be ensured that the conductive slider is always in a coaxial state with the precision resistance tube during linear motion, ensuring that the contact state between the spring coil and the outer surface of the precision resistance tube is always the same, thereby ensuring that its contact resistance remains unchanged.

[0063] As Figure 2As shown, the insulating member 4 may include a first connecting portion 41, a second connecting portion 42, and a third connecting portion 43 that are sequentially connected. The second connecting portion 42 may be disposed on the driving rod 10, and the first connecting portion 41 and the second connecting portion 42 may be slidably connected to a pair of guide rods 9 respectively. The pair of guide rods 9 is beneficial to the stable sliding of the sliding assembly, but the present application does not limit the number and position of the guide rods 9.

[0064] In some embodiments of the present application, the second connecting portion 42 may be provided with a lead screw nut that is adapted to the lead screw. The sliding of the sliding assembly along the resistance tube is achieved through the adaptation between the lead screw and the lead screw nut, which can increase the accuracy of resistance adjustment. By adopting a ball screw, a ball screw nut, and a stepper motor structure, the position of the conductive slider can be accurately controlled, and its position positioning accuracy can reach 10 microns, making the change of the variable load (a resistance element with an adjustable resistance value) smooth, thus ensuring the smoothness and accuracy of the test data.

[0065] In some embodiments of the present application, as Figure 2 shown, the resistance element 100 with an adjustable resistance value may include a plurality of connection terminals 7, and some of the connection terminals 7 among the plurality of connection terminals 7 may be disposed on the second bracket 202 for inputting a test current.

[0066] As Figure 2 shown, the sliding member may include a sliding portion 12 and a clamping portion 13. The sliding portion 12 is disposed on the resistance tube 11 in a manner that it can slide along the resistance tube 11, and the clamping portion 13 clamps the outer periphery of the sliding portion 12. The remaining connection terminals 7 among the plurality of connection terminals 7 may be disposed on the clamping portion 13 for outputting a test current.

[0067] In some embodiments, the surface coating of the sliding portion 12 may also have the same coating material as the outermost coating of the conductive member 14 and the outermost coating of the resistance tube 11. For example, in some embodiments, the material of the sliding portion 12 may be copper, and the outermost coating of the sliding portion 12 may be gold-plated.

[0068] In the present application, the sliding portion 12 may be integral or may be formed by connecting a plurality of sliding portions 12. In some embodiments where the sliding portion 12 is formed by connecting a plurality of sliding portions 12, the clamping portion 13 may also fix the sliding portion 12 more stably. In such embodiments, it is convenient to replace resistance tubes with different diameters. The cross-section (in the radial direction of the resistance tube) of the resistance tube is different, and the resistance value is different. Thus, it is possible to apply to resistance tubes with different resistance values to test thermoelectric elements with a variety of different resistance values.

[0069] The clamping portion 13 may be beneficial to fixing the sliding portion 12 and contribute to the stable connection between the sliding portion 12 and the conductive member 14.

[0070] In some embodiments of the present application, the inner wall surface of the mounting ring is coated with an anti-oxidation coating. For example, the inner wall of the mounting ring can be gold-plated, and the gold-plated layer can effectively prevent the oxidation of the surface of the slider, avoiding the increase of the contact resistance between the conductive member 14 and the precision resistance tube over time.

[0071] The thermoelectric element testing device provided by the present application includes: a housing that forms a sealed cavity; a resistance element with adjustable resistance as described in the foregoing embodiments, disposed in the sealed cavity, and the second end of the resistance element with adjustable resistance is used for electrical connection with the thermoelectric element.

[0072] In the present application, at least a part of the conductive member protrudes from the inner wall surface of the sliding member, and electrical connection with the resistance tube is achieved through the conductive member. Such a setting can reduce the contact area compared with the overall electrical connection of the sliding assembly with the resistance tube. Therefore, the overall internal resistance of the resistance element can be reduced. At the same time, due to the reduction of the contact area, more precise adjustment can also be made during the adjustment of the resistance. Thus, the thermoelectric element testing device can accurately measure the maximum output power and the complete power characteristic curve of the thermoelectric element.

[0073] In some embodiments of the present application, the resistance element with adjustable resistance as a variable load may include a base, a slide rail (guide rod), a linear bearing, a ball screw (drive rod), a ball screw nut, a slide rail bracket (guide rod bracket), a screw bearing seat, a precision resistance tube (resistance tube), a resistance tube bracket (a first bracket and a second bracket), an insulating tube, a conductive slider (sliding part), a conductive slider clamp, an insulating block (insulating member), a terminal, and a stepping motor (motor). The base is made of aluminum profile for installing and fixing various components. The precision resistance tube is an external simulated load, and its material is a nickel-based alloy with appropriate resistivity and wear resistance. Its cross-sectional size can be selected according to the internal resistance of the thermoelectric device to be tested. Its roundness and straightness strictly control the geometric tolerances, and the surface is polished. One end is sleeved with an insulating tube. Both ends of the resistance tube are fixed to the base with resistance tube brackets. The conductive slider penetrates through the precision resistance tube, and its material is copper with a gold-plated surface. Several gold-plated beryllium copper spring rings are installed on the inner wall to form good electrical contact with the outer surface of the precision resistance tube. The conductive slider is tightly clamped by the conductive slider clamp and fixed on the insulating block. The insulating block is made of PEEK engineering plastic, and a ball screw nut is installed in the middle. Linear bearings are installed at both ends. The linear bearings penetrate the corresponding linear guide rails. Terminals are provided on the conductive slider clamp and the resistance tube bracket. The ball screw nut penetrates through the ball screw of the corresponding specification, and both ends of the ball screw are fixed to the base with bearing seats. The ball screw is driven by a stepping motor fixed at one end of the base, driving the ball screw nut to move linearly along the axial direction of the screw, thereby driving the conductive slider to move linearly along the axial direction of the precision resistance tube, changing the resistance value of the resistance tube between the conductive slider and one end of the resistance tube bracket. By controlling the position of the conductive slider, a series of load resistances can be obtained.

[0074] By adopting a double-track structure and precision nickel-based alloy tubes, it can ensure that the conductive slider and the precision resistance tube are always coaxial during linear motion, ensuring that the contact state between the spring coil and the outer surface of the precision resistance tube is always consistent, thus ensuring that its contact resistance remains unchanged. The surface of the precision resistance tube is polished, and a beryllium copper spring coil with excellent elasticity is installed on the inner wall of the conductive slider. The spring coil is in close contact with the surface of the precision resistance tube, greatly reducing the contact resistance between the conductive slider and the precision resistance tube. The surface of the conductive slider is gold-plated, effectively avoiding oxidation on the surface of the slider and preventing the contact resistance between the conductive slider and the precision resistance tube from increasing over time. The cross-sectional size of the precision tube adapted to the device and the extremely small contact resistance ensure that the system has sufficient current-carrying capacity. By adopting a ball screw, a ball screw nut and a stepping motor structure, the position of the conductive slider can be accurately controlled, and its position positioning accuracy can reach 10 microns, making the change of the variable load resistance smooth, thus ensuring the smoothness and accuracy of the test data. Moreover, the stepping motor can accurately adjust the resistance change rate, thereby changing the current change rate, and can realize the test of the power characteristic curve under different current scanning rates. According to different internal resistances of the devices, alloy resistance tubes with different cross-sections can be selected for replacement, with wide adaptability and strong practicability.

[0075] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0076] In the description of the embodiments of this application, technical terms such as "first", "second", "third", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, "a plurality of" means more than two, unless otherwise specifically defined.

[0077] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0078] In the description of the embodiments of the present application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0079] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0080] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0081] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense. It may be direct contact or contact through an intermediate medium layer. It may be contact where there is basically no mutual force between the two in contact, or contact where there is a mutual force between the two in contact.

[0082] The above embodiments are only used to illustrate the technical solutions of the present application, rather than limiting them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A resistance element with adjustable resistance value, characterized in that, Applied to a thermoelectric element testing device, the resistance element with adjustable resistance value includes: A support base; A resistance tube having a first end and a second end oppositely arranged along its axial direction, the first end and the second end are respectively fixed to the support base, the first end is insulated from the support base, and the second end is used to connect with the thermoelectric element to introduce a test current into the resistance tube; A sliding assembly including a conductive member and a sliding member electrically connected to each other. The resistance tube passes through an installation ring of the sliding member, and the sliding member is arranged on the resistance tube in a manner that can slide along the axial direction of the resistance tube. The conductive member is connected to the inner wall surface of the installation ring and at least partially protrudes from the inner wall surface to be electrically connected to the resistance tube; and A driving member arranged on the support base, and the driving member is used to drive the sliding member to slide on the resistance tube.

2. The resistance element with adjustable resistance value according to claim 1, wherein The conductive member is an annular elastic member and the number is multiple. Along the axial direction of the resistance tube, multiple conductive members are spaced apart and distributed on the inner wall surface of the installation ring; and / or The conductive member is a spring coil, the spring coil includes multiple layers of conductive coatings, and the coating material of the outermost layer of the spring coil is the same as the coating material of the outermost layer of the resistance tube.

3. The resistance element with adjustable resistance value according to claim 1 or 2, wherein The driving member includes a motor and a driving rod, the driving rod is connected to the sliding assembly, and the motor drives the sliding assembly to move through the driving rod; The sliding assembly further includes an insulating member, the sliding member is connected to the insulating member, and the insulating member is connected to the driving rod and can move under the drive of the driving rod, thereby driving the sliding member to slide along the resistance tube.

4. The adjustable resistance value resistor element according to claim 3, characterized in that, The resistance element with adjustable resistance value includes: A guiding rod, the axial direction of the guiding rod is parallel to the axial direction of the resistance tube, and the insulating member is slidably sleeved on the guiding rod.

5. The resistance element with adjustable resistance value according to claim 4, wherein The guiding rod is provided as a pair, and the pair of guiding rods are symmetrically arranged with the driving rod as the center; The insulating member includes a first connecting portion, a second connecting portion, and a third connecting portion connected in sequence. The second connecting portion is arranged on the driving rod, and the first connecting portion and the second connecting portion are respectively slidably connected to the pair of guiding rods.

6. The resistance element with adjustable resistance value according to claim 5, wherein The driving rod is provided as a lead screw, and the axial direction of the lead screw is parallel to the axial direction of the resistance tube; The second connecting portion is provided with a lead screw nut, and the lead screw nut is adapted to the lead screw.

7. The resistance element with adjustable resistance value according to claim 1, wherein The support base includes a base, a first bracket, and a second bracket. The first bracket and the second bracket are spaced apart along the axial direction of the resistance tube and supported on the base. The second end is electrically connected to the second bracket, and the first end is insulatedly connected to the first bracket; The resistance element with adjustable resistance value includes: a plurality of connection terminals, and some of the plurality of connection terminals are arranged on the second bracket for inputting the test current; The sliding member includes a sliding portion and a clamping portion. The sliding portion is arranged on the resistance tube in a manner capable of sliding along the resistance tube, and the clamping portion is clamped on the outer periphery of the sliding portion. The remaining connection terminals among the plurality of connection terminals are arranged on the clamping portion for outputting the test current.

8. The resistance element with adjustable resistance value according to claim 1, wherein The driving member is arranged on the support seat and is arranged close to the second end along the axial direction of the resistance tube.

9. The resistance element with adjustable resistance value according to claim 1, wherein The inner wall surface of the mounting ring is coated with an anti-oxidation coating.

10. A thermoelectric element testing device, characterized in that, Comprising: A housing that forms a sealed cavity; The resistance element with adjustable resistance value according to any one of claims 1 to 9, which is arranged in the sealed cavity, and the second end of the resistance element with adjustable resistance value is used for electrically connecting with the thermoelectric element.

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