阅读说明：本技术 一种用于量热计外表面温度控制的固态恒温装置 (Solid-state constant temperature device for controlling temperature of outer surface of calorimeter ) 是由 武超 刘丽飞 吕卫星 任英 胡石林 尹文续 于 2019-10-31 设计创作，主要内容包括：本发明属于放射性环境温度控制技术领域,具体涉及一种用于量热计外表面温度控制的固态恒温装置。包括设置在量热计外表面的串联的若干块半导体制冷片,能够随着输入半导体制冷片的电流的方向的改变对量热计进行制冷或制热,改变电流大小能够控制半导体制冷片的制冷或者制热的功率；还包括用于为半导体制冷片提供电流的高精度数字源表,用于监测反馈量热计外表面温度的测温元件,用于读取测温元件测量的温度的多功能数字万用表,连接高精度数字源表和多功能数字万用表的计算机,计算机设有用于控制高精度数字源表的电流的输出大小及方向的温度控制程序。本发明使量热计的测量不再受到环境温度波动的影响,且不存在水泄露的隐患。(The invention belongs to the technical field of radioactive environment temperature control, and particularly relates to a solid constant temperature device for controlling the temperature of the outer surface of a calorimeter. The calorimeter comprises a plurality of semiconductor refrigerating sheets which are arranged on the outer surface of the calorimeter and connected in series, the calorimeter can be cooled or heated along with the change of the direction of current input into the semiconductor refrigerating sheets, and the cooling or heating power of the semiconductor refrigerating sheets can be controlled by changing the current; the temperature control device comprises a semiconductor refrigeration piece, a temperature measuring element, a multifunctional digital multimeter and a computer, wherein the semiconductor refrigeration piece is used for providing current for the semiconductor refrigeration piece, the temperature measuring element is used for monitoring the temperature of the outer surface of the feedback calorimeter, the multifunctional digital multimeter is used for reading the temperature measured by the temperature measuring element, the computer is connected with the high-precision digital source meter and the multifunctional digital multimeter, and the computer is provided with a temperature control program used for controlling the output size and the direction of the current of the high-precision digital source meter. The invention ensures that the measurement of the calorimeter is not influenced by the fluctuation of the ambient temperature any more, and has no hidden trouble of water leakage.)

1. A solid-state constant temperature device for controlling the temperature of the outer surface of a calorimeter is characterized in that: the temperature control surface of the semiconductor refrigeration piece (5) is in contact with the outer surface of the calorimeter (7), the temperature control surface can refrigerate or heat the calorimeter (7) along with the change of the direction of current input into the semiconductor refrigeration piece (5), and the change of the current can control the refrigerating or heating power of the semiconductor refrigeration piece (5); the high-precision digital source meter (2) is used for monitoring and feeding back the temperature measuring element (6) of the temperature of the outer surface of the calorimeter (7), the multifunctional digital multimeter (3) is used for reading the temperature measured by the temperature measuring element (6), the high-precision digital source meter (2) and the computer (1) of the multifunctional digital multimeter (3) are connected, and the computer (1) is provided with a temperature control program which is used for controlling the output size and the direction of the current of the high-precision digital source meter (2).

2. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the heat dissipation surface of each semiconductor refrigeration piece (5) is provided with a radiator (4), the heat dissipation surface is the surface of the semiconductor refrigeration piece (5) which is not in contact with the calorimeter (7), and the radiators (4) are connected in parallel.

3. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: and a heat insulation layer is arranged on the outer surface of the calorimeter (7), and is used for insulating the area, which is not in contact with the semiconductor refrigeration sheet (5), on the outer surface of the calorimeter (7).

4. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the distance between the semiconductor refrigerating pieces (5) is 10-15 cm.

5. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the current output precision of the high-precision digital source meter (2) is better than 1 microampere.

6. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the resolution of the temperature measuring element (6) is better than 0.001 ℃.

7. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: and the temperature control program selects proper parameters according to the temperature read by the multifunctional digital multimeter (3) through a PID algorithm to adjust the output magnitude and direction of the current of the high-precision digital source meter (2), so that the temperature of the outer surface of the calorimeter (7) is constant at a set value.

8. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the temperature control range of the temperature control surface of the semiconductor refrigerating plate (5) is-40 ℃ to +200 ℃.

9. The solid-state thermostat for calorimeter external surface temperature control of claim 1, wherein: the temperature measuring elements (6) are fixed on the outer surface of the calorimeter (7), and the number of the temperature measuring elements (6) is two, one for one.

10. The solid-state thermostat for calorimeter external surface temperature control of claim 2, wherein: and heat-conducting silicone grease is coated between the semiconductor refrigerating sheet (5) and the calorimeter (7), and heat-conducting silicone grease is coated between the radiator (4) and the semiconductor refrigerating sheet (5).

Technical Field

The invention belongs to the technical field of radioactive environment temperature control, and particularly relates to a solid constant temperature device for controlling the temperature of the outer surface of a calorimeter.

Background

Calorimetry is a method of measuring the thermal power generated by a sample, and is widely used for chemical energy, biological energy, radioactive half-life, average decay energy, and radioactivity measurement. The analysis process is non-destructive, so the method is very suitable for the analysis and the quantification of the radioactive substance, and the emission of the radioactive substance to the environment is not increased when the radioactive substance is analyzed.

However, when a sample with a small thermal power is analyzed, the analysis result is greatly influenced by the fluctuation of the ambient temperature, and in order to improve the analysis accuracy, two methods are mainly applied at present, wherein one method is to add a constant temperature body on the outer surface of the calorimeter, the influence of the fluctuation of the ambient temperature on the measurement accuracy of the calorimeter is reduced by controlling the temperature of the constant temperature body to keep the temperature of the outer surface of the calorimeter constant temperature, and the other method is to perform temperature compensation on the fluctuation of the ambient temperature on the basis of an algorithm, but the compensation algorithm is not mature. In the first mode, the most used constant temperature body is circulating water, and the influence of the fluctuation of the ambient temperature on the measurement precision of the calorimeter is reduced by controlling the temperature of the circulating water to make the temperature of the outer surface of the calorimeter constant. However, in some special locations, such as radioactive locations, the presence or leakage of water can increase the amount of radioactive waste that can be disposed of.

Disclosure of Invention

Aiming at the defects of the constant temperature body of circulating water adopted at present, the invention mainly aims to provide a solid constant temperature device which can keep the outer surface of a calorimeter constant in temperature, reduce the influence of environment temperature fluctuation on measurement and improve the measurement precision.

In order to achieve the above purpose, the technical scheme adopted by the invention is a solid-state constant temperature device for controlling the temperature of the outer surface of a calorimeter, wherein the solid-state constant temperature device comprises a plurality of semiconductor chilling plates which are arranged on the outer surface of the calorimeter and are connected in series, the temperature control surfaces of the semiconductor chilling plates are in contact with the outer surface of the calorimeter, the temperature control surfaces can refrigerate or heat the calorimeter along with the change of the direction of current input into the semiconductor chilling plates, and the change of the current can control the refrigerating or heating power of the semiconductor chilling plates; the temperature control device comprises a semiconductor refrigeration piece, a high-precision digital source meter, a temperature measuring element, a multifunctional digital multimeter and a computer, wherein the high-precision digital source meter is used for providing current for the semiconductor refrigeration piece, the temperature measuring element is used for monitoring and feeding back the temperature on the outer surface of the calorimeter, the multifunctional digital multimeter is used for reading the temperature measured by the temperature measuring element, the computer is connected with the high-precision digital source meter and the multifunctional digital multimeter, and the computer is provided with a temperature control program used for controlling the output size and the direction of the current of the high-.

Furthermore, a radiator is arranged on the radiating surface of each semiconductor refrigerating sheet, the radiating surface refers to the surface of each semiconductor refrigerating sheet which is not in contact with the calorimeter, and the radiators are connected in parallel.

Further, a heat insulation layer is arranged on the outer surface of the calorimeter and used for insulating a region, which is not in contact with the semiconductor refrigeration sheet, on the outer surface of the calorimeter.

Further, the distance between the semiconductor refrigeration pieces is 10-15 cm.

Further, the current output precision of the high-precision digital source meter is superior to 1 microampere.

Furthermore, the resolution of the temperature measuring element is better than 0.001 ℃.

Further, the temperature control program selects proper parameters through a PID algorithm according to the temperature read by the multifunctional digital multimeter to adjust the output magnitude and direction of the current of the high-precision digital source meter, so that the temperature of the outer surface of the calorimeter is constant at a set value.

Further, the temperature control range of the temperature control surface of the semiconductor refrigerating sheet is-40 ℃ to +200 ℃.

Furthermore, the temperature measuring elements are fixed on the outer surface of the calorimeter, and the number of the temperature measuring elements is two, one for one.

Further, heat-conducting silicone grease is coated between the semiconductor refrigeration piece and the calorimeter, and heat-conducting silicone grease is coated between the radiator and the semiconductor refrigeration piece.

The invention has the beneficial effects that:

1. the solid constant temperature device provided by the invention can stabilize the temperature of the outer surface of the calorimeter at +/-0.002 ℃, so that the measurement is not influenced by the fluctuation of the ambient temperature, and the measurement precision of the calorimeter is improved from 1% to less than 0.3%.

2. Different from a circulating water constant temperature mode, the method has no hidden danger of water leakage, does not have vibration and noise of a circulating water pump, increases the application range of the calorimeter, and reduces the requirement of the calorimeter on environmental conditions.

Drawings

FIG. 1 is a schematic view of a solid-state thermostat for calorimeter external surface temperature control, as described in the detailed description of the invention;

FIG. 2 is a schematic view of the arrangement of a solid-state thermostat for calorimeter external surface temperature control in an embodiment of the present invention on the external surface of the calorimeter;

in the figure: the method comprises the following steps of 1-a computer, 2-a high-precision digital source meter, 3-a multifunctional digital multimeter, 4-a radiator, 5-a semiconductor refrigeration sheet, 6-a temperature measurement element, 7-a calorimeter and 8-a temperature control unit.

Detailed Description

The invention is further described below with reference to the figures and examples.

The idea of the invention is to invent a set of solid-state constant temperature device to replace a circulating water constant temperature mode which is widely applied, thereby not only ensuring the analysis precision, but also not worrying about the leakage problem of water. Semiconductor cooling fins (peltier) transfer heat from the cold side to the hot side by using the principle that when current is passed through a thermocouple, one of the nodes dissipates heat and the other node absorbs heat. The cooling power and the current direction can be changed by changing the current magnitude, and the cooling and heating modes can be switched. Therefore, a certain amount of semiconductor refrigeration pieces are uniformly distributed on the outer surface of the calorimeter and are connected in series, the magnitude and the direction of current supplied to the semiconductor refrigeration pieces are controlled through a temperature control program, the temperature of the calorimeter main body is monitored, the temperature of the outer surface of the calorimeter is constant, the influence of environment temperature fluctuation on measurement is reduced, and the purpose of improving the measurement accuracy of the calorimeter is achieved.

According to the above idea, as shown in fig. 1, the components of the solid-state constant temperature device for calorimeter outer surface temperature control provided by the invention comprise a semiconductor refrigeration sheet 5, a high-precision digital source meter 2, a radiator 4, a temperature measuring element 6, a multifunctional digital multimeter 3 and a computer 1 provided with a temperature control program.

As shown in fig. 2, the semiconductor chilling plates 5 are arranged on the outer surface of the calorimeter 7, and the semiconductor chilling plates 5 are connected in series. The installation number and the installation positions of the semiconductor refrigeration pieces 5 are determined according to the size of the calorimeter 7, and the semiconductor refrigeration pieces 5 are uniformly distributed on the outer surface of the calorimeter 7, are 10-15 cm away from each other and are used for directly controlling the temperature of the outer surface of the calorimeter 7. The temperature control surface of the semiconductor refrigerating sheet 5 is in contact with the outer surface of the calorimeter 7, the temperature control surface can refrigerate or heat the calorimeter 7 along with the change of the direction of the current input into the semiconductor refrigerating sheet 5 (namely, the direction of the current is changed, the semiconductor refrigerating sheet 5 can be switched between two working modes of refrigeration or heating), and the refrigeration or heating power of the semiconductor refrigerating sheet 5 can be controlled by changing the current.

As shown in fig. 1, a heat sink 4 is arranged on a heat dissipation surface of each semiconductor refrigeration sheet 5, the heat dissipation surface refers to a surface of the semiconductor refrigeration sheet 5 which is not in contact with the calorimeter 7, the heat sinks 4 are connected in parallel, and after the heat sinks 4 are connected in parallel, a common power supply meeting requirements is connected according to requirements of input voltage and total power of the heat sinks. The radiator 4 is used for radiating heat of the hot end of the semiconductor refrigeration piece 5 and preventing the hot end of the semiconductor refrigeration piece 5 from being burnt due to overheating, the semiconductor refrigeration piece 5 and the radiator 4 which are arranged together form a temperature control unit 8, and the temperature control unit 8 and the calorimeter 7 are fixed through screws.

The high-precision digital source meter 2 is connected with the semiconductor refrigerating piece 5 which is connected in series and used for providing current for the semiconductor refrigerating piece 5, and the current output precision of the high-precision digital source meter 2 is superior to 1 microampere.

The outer surface of the calorimeter 7 is provided with a heat preservation layer, and the heat preservation layer is used for preserving heat of an area, which is not in contact with the semiconductor refrigeration sheet 5, on the outer surface of the calorimeter 7. The heat preservation layer is provided with a hole, and the semiconductor refrigeration piece 5 is arranged in the hole of the heat preservation layer.

The temperature measuring element 6 is fixed on the outer surface of the calorimeter 7 and used for monitoring the temperature of the outer surface of the feedback calorimeter 7, and the resolution is superior to 0.001 ℃. The number of the temperature measuring elements 6 is two, one for each use.

The multifunctional digital multimeter 3 is used for reading the temperature measured by the temperature measuring element 6. And a lead of the temperature measuring element 6 is led out from the heat insulation layer and is connected with the multifunctional digital multimeter 3.

The high-precision digital source meter 2 and the multifunctional digital multimeter 3 are connected to the computer 1, and the computer 1 is provided with a temperature control program for controlling the output magnitude and direction of the high-precision digital source meter 2 to the current of the semiconductor refrigeration sheet 5. And the temperature control program selects proper parameters through a PID algorithm according to the temperature read by the multifunctional digital multimeter 3 to adjust the output size and the output direction of the high-precision digital source meter 2 to the current of the semiconductor refrigeration sheet 5, so that the temperature of the outer surface of the calorimeter 7 is constant at a set value.

In actual use, firstly, the high-precision digital source meter 2, the multifunctional digital multimeter 3, the computer 1 and the radiator 4 are connected to commercial power by power supply and started; and then opening a temperature control program, setting a temperature value which needs to be reached by the calorimeter 7 in the temperature control program, then operating the temperature control program, controlling the high-precision digital source meter 2 to output corresponding current to the semiconductor refrigeration sheet 5 by the temperature control program, monitoring the temperature value fed back by the multifunctional digital multimeter 3 by the temperature control program, adjusting the current output of the high-precision digital source meter 2 at any time according to the temperature value, observing the temperature change condition by a worker, and starting to measure by using the calorimeter 7 when the temperature fluctuation reaches an expected value. In this process, the radiator 4 is in operation.

The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.