阅读说明：本技术 一种测量直流小电压的低热电势接线模块 (Low-heat electromotive force wiring module for measuring direct-current small voltage ) 是由 朱珠 康焱 张力丹 于 2020-05-13 设计创作，主要内容包括：本发明公开一种测量直流小电压的低热电势接线模块,包括接线端子和恒温块,恒温块上装有接线柱,接线柱穿过恒温块与接线端子相接,所述恒温块、接线柱和接线端子均采用紫铜镀金材料。本发明所述的恒温块、接线柱和接线端子均采用紫铜镀金材料,减小连接点由于不同材料的热电系数造成的温度差,利用恒温块,快速吸收接线柱及接线端子上的热量,使其快速达到温度均衡,减小两头接线端子之间的温度差,有效的减小了连接端子上产生的热电势至nV量级,并且连接后热电势在30秒以后即可达到稳定,提高了测试效率。(The invention discloses a low-heat electromotive force wiring module for measuring direct-current small voltage, which comprises a wiring terminal and a constant-temperature block, wherein the constant-temperature block is provided with a wiring terminal, the wiring terminal penetrates through the constant-temperature block to be connected with the wiring terminal, and the constant-temperature block, the wiring terminal and the wiring terminal are all made of red copper gold-plated materials. The constant temperature block, the binding post and the binding post are all made of red copper gold-plated materials, so that the temperature difference of a connecting point caused by thermoelectric coefficients of different materials is reduced, the constant temperature block is utilized to quickly absorb heat on the binding post and the binding post, so that the temperature of the binding post and the binding post is quickly balanced, the temperature difference between the binding post at two ends is reduced, the thermoelectric force generated on the binding post is effectively reduced to the order of nV, the thermoelectric force after connection can be stabilized after 30 seconds, and the testing efficiency is improved.)

1. The utility model provides a measure low-heat electromotive force wiring module of direct current low-voltage which characterized in that: the temperature-constant connecting device comprises a connecting terminal and a constant temperature block, wherein the constant temperature block is provided with a binding post, the binding post penetrates through the constant temperature block to be fixedly connected with the connecting terminal, and the constant temperature block, the binding post and the connecting terminal are all made of red copper gold-plated materials.

2. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 1, characterized in that: and an insulating heat-conducting gasket is arranged between the constant-temperature block and the wiring terminal.

3. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 2, characterized in that: the insulating heat-conducting gasket is made of beryllium oxide ceramic material.

4. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 2 or 3, characterized in that: and the wiring terminal is provided with a limiting surface for positioning the insulating heat-conducting gasket.

5. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 1, characterized in that: the constant temperature block is provided with a terminal mounting hole, and a limiting check ring for fixing the terminal is arranged at the port of the terminal mounting hole.

6. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 5, characterized in that: the limiting retainer ring is made of high-temperature-resistant insulating materials.

7. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 1, characterized in that: the binding post is equipped with two at least, and binding post is all equipped with at the both ends of every binding post.

8. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 7, wherein: the terminals are arranged crosswise on different cross sections of the thermostatic block.

9. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 1, characterized in that: the terminal end of the binding post is fixed with a connecting post, a pipe joint connected with the connecting post is arranged on the connecting terminal, and the outer diameter of the pipe joint is larger than that of the connecting post.

10. The low thermoelectric potential wiring module for measuring a small direct current voltage according to claim 9, characterized in that: the pipe joint is provided with an internal thread, and the connecting column is provided with an external thread matched with the internal thread.

Technical Field

The invention relates to a low-thermoelectrical potential module, in particular to a low-thermoelectrical potential wiring module for measuring direct current small voltage.

Background

In the magnitude transfer of quantum voltages, the influence of the connected thermoelectric potential is a non-negligible introduction into the evaluation of the uncertainty of the measurement results. In general, without the selection of the connection terminal contact metal, the thermoelectric voltage may reach the microvolt level, which seriously affects the measurement uncertainty of the direct current voltage, especially the direct current small voltage below 10 mV.

According to the seebeck effect formula EAB ═ SAB (T1-T2), where EAB is the thermoelectric potential when different materials are connected, and is given in V, SAB is the thermoelectric coefficient of different materials A, B, and is given in V/° c, and T1 and T2 are the temperatures of two bonding points, respectively, and are given in ℃. As can be seen from the Seebeck effect formula, the magnitude of thermoelectric potential is related to the contact material and temperature of the bonding point, and the thermoelectric coefficients of different materials in contact with copper are very different, for example, the thermoelectric coefficient of Cu-Cu is less than or equal to 0.2 μ V/DEG C, the thermoelectric coefficient of Cu-Au is about 0.3 μ V/DEG C, the thermoelectric coefficient of Cu-Pb/Sn is about (1-3) μ V/DEG C, the thermoelectric coefficient of Cu-Si is about 400 μ V/DEG C, and the thermoelectric coefficient of Cu oxide-Cu oxide is about 1400 μ V/DEG C. Therefore, in the wire connection in high-precision measurement, a connection terminal made of pure copper is generally used to generate the minimum thermoelectric force, but since the surface of pure copper is very easy to oxidize, the connection position must be kept clean, and polishing of the copper surface is required after oxidation to avoid the generation of large thermoelectric force in the Cu oxide-Cu oxide connection.

In addition, a certain temperature difference exists between the two terminals during connection, and the temperature needs to be balanced for a period of time after connection, so that a variable thermoelectric potential is brought in the period, and a certain influence is brought to precision measurement, particularly precision direct-current small-voltage measurement.

Disclosure of Invention

The invention aims to provide a low-thermoelectric-potential wiring module for measuring direct-current small voltage, which is reasonable in design and solves the problem that a connection terminal generates large thermoelectric potential to influence a measurement result in precise direct-current small voltage measurement.

In order to achieve the above purpose, the invention provides the following technical scheme:

the invention relates to a low-heat electromotive force wiring module for measuring direct-current small voltage, which comprises a wiring terminal and a constant-temperature block, wherein the constant-temperature block is provided with a wiring terminal, the wiring terminal penetrates through the constant-temperature block to be fixedly connected with the wiring terminal, and the constant-temperature block, the wiring terminal and the wiring terminal are all made of red copper gold-plated materials.

Compared with the prior art, the connecting terminal and the connecting terminal are made of red copper gold-plated materials, the temperature difference of the connecting point caused by thermoelectric coefficients of different materials is reduced, the constant temperature block is utilized to quickly absorb heat on the connecting terminal and the connecting terminal, so that the temperature of the connecting terminal and the connecting terminal is quickly balanced, the temperature difference between the two connecting terminals is reduced, the thermoelectric force generated on the connecting terminal is effectively reduced to the nV magnitude, the thermoelectric force after connection can be stabilized after 30 seconds, and the testing efficiency is improved.

Preferably, an insulating heat-conducting gasket is arranged between the constant-temperature block and the binding post, the insulating heat-conducting gasket is made of beryllium oxide ceramic materials, and a limiting surface used for positioning the insulating heat-conducting gasket is arranged on the binding post.

Preferably, be equipped with the terminal mounting hole on the constant temperature block, the port department of terminal mounting hole is equipped with the spacing retaining ring that is used for fixed terminal, spacing retaining ring adopts high temperature resistant insulating material.

Preferably, the number of the binding posts is at least two, the two ends of each binding post are provided with connecting terminals, and the binding posts are arranged on different cross sections of the thermostatic block in a crossing mode.

Preferably, the terminal end of the binding post is fixed with a connecting post, a pipe joint connected with the connecting post is arranged on the connecting post, the outer diameter of the pipe joint is larger than that of the connecting post, an internal thread is arranged on the pipe joint, and an external thread matched with the internal thread is arranged on the connecting post.

The low-thermoelectric-potential wiring module for measuring the small direct-current voltage has the same beneficial effects as the low-thermoelectric-potential wiring module, and the description is omitted.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a structural view of a low thermoelectric potential wiring module according to the present invention.

Reference numerals:

1-wiring terminal, 2-wiring terminal, 3-constant temperature block, 4-insulating heat conduction gasket and 5-connecting column.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1, the invention provides a low-heat electromotive force wiring module for measuring direct-current small voltage, which comprises a wiring terminal 1 and a constant-temperature block 3, wherein a wiring terminal 2 is arranged on the constant-temperature block 3, the wiring terminal 2 penetrates through the constant-temperature block 3 to be fixedly connected with the wiring terminal 1, and the constant-temperature block 3, the wiring terminal 2 and the wiring terminal 1 are all made of red copper gold-plated materials; an insulating heat conduction gasket 4 is arranged between the constant temperature block 3 and the binding post 2, the insulating heat conduction gasket 4 is made of beryllium oxide ceramic materials, a limiting surface for positioning the insulating heat conduction gasket is arranged on the binding post 1, a binding post mounting hole is formed in the constant temperature block 3, a limiting check ring for fixing the binding post is arranged at the port of the binding post mounting hole, the limiting check ring is made of high-temperature-resistant insulating materials, the binding post 2 and the insulating heat conduction gasket 4 can be stably mounted in the binding post mounting hole and cannot slide out under the action of the limiting surface and the binding post limiting check ring, the limiting surface can be an end surface of the binding post connected with the binding post, and the outer diameter of the end surface is larger than that of;

the wiring terminals 2 are at least two, the two ends of each wiring terminal 2 are provided with wiring terminals, the wiring terminals 2 are crossly arranged on different cross sections of the constant temperature block 3, and the heat conduction positions are staggered, so that the heat dissipation area can be increased, and the temperature can quickly reach balance;

2 end fixing of terminal has spliced pole 5, is equipped with the coupling that meets with spliced pole 5 on the binding post 1, the external diameter of coupling is greater than the external diameter of spliced pole be equipped with the internal thread on the coupling, be equipped with on the spliced pole with internal thread complex external screw thread, increase the area of contact between terminal and the binding post, improve heat transfer speed and efficiency.

When two terminals are connected, a thermoelectric potential EAB (SAB) (T1-T2) is generated at the connection according to the seebeck effect formula, and the thermoelectric coefficient, the temperature difference and the fluctuation thereof need to be controlled to reduce the thermoelectric potential and the fluctuation thereof at the connection. The thermoelectric coefficient is reduced by selecting proper materials, and the temperature difference and the fluctuation thereof need to increase the heat capacity of the connecting part so as to ensure that the temperatures of the two wiring terminals are quickly balanced, so the wiring terminals are connected by the wiring terminals, and the wiring terminals are made of red copper gold-plated materials, thereby reducing the thermoelectric potential and the fluctuation thereof of the connecting point caused by the thermoelectric coefficients of different materials, and simultaneously, the wiring terminals and the wiring terminals made of red copper gold-plated materials can prevent the thermoelectric potential deterioration caused by the oxidation of red copper; the insulating heat-conducting gasket is used for insulation and heat conduction between the wiring terminal and the constant temperature block, and is made of a material with high insulation and high heat conduction, such as a beryllium oxide ceramic material; the constant temperature block is used for rapidly absorbing heat on the wiring terminal to enable the wiring terminal to rapidly reach temperature balance.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.