CN107449794A - The active liquid-solid-phase changeable temperature detection device and method of a kind of semiconductor refrigerating - Google Patents

Abstract

The active liquid-solid-phase changeable temperature detection device and method of a kind of semiconductor refrigerating, including temperature sensor, conduction cooling module, semiconductor, radiating module and circuit module；Conduction cooling module is connected to the top of semiconductor, and temperature sensor is provided with above conduction cooling module；Radiating module is connected with below semiconductor, circuit module is provided with below radiating module.The component price that the device of the present invention uses is low, simple in construction, has relative to traditional large-scale measurement apparatus easily operated, and measurement temperature scope is big, and cost low the advantages of being easy to be widely applied.

Description

An active liquid-solid phase transition temperature detection device and method for semiconductor refrigeration

technical field

The invention belongs to the field of sensor and computer measurement and control, in particular to an active liquid-solid phase transition temperature detection device and method for semiconductor refrigeration.

Background technique

The liquid-solid phase transition temperature (or freezing point temperature) of liquids is an important meteorological monitoring data, and the measurement indicators such as liquid-solid phase transition temperature of liquids are particularly important in many industries such as warehousing, transportation, electric power, automobiles, and logistics. Taking the warehousing industry as an example, a wide variety of liquids are easily affected by the liquid-solid phase transition temperature, which reduces product quality, thereby reducing the user's stickiness to the product. In the power industry, rainwater condensation can cause transmission lines to break or poor transmission, resulting in large-scale regional power outages.

Due to the influence of altitude, air pressure, chemical composition and many other factors, there is always a difference between the real liquid-solid phase transition temperature and the theoretical value. In many occasions, detecting the precise phase transition temperature before the liquid-solid phase transition occurs can help prevent the occurrence probability and time of the liquid-solid phase transition phenomenon, and help avoid or reduce the liquid-solid phase transition through pre-treatment. harm.

However, the existing mainstream liquid-solid phase transition temperature measuring devices (such as automatic freezing point tester, petroleum freezing point tester) and the like all have the problems of high price and large volume, and are still mainly used in teaching or other special fields. , Transportation, electricity, automobiles, logistics and other industries have restrictions on the wide-scale popularization and use of them.

Contents of the invention

The purpose of the present invention is to provide an active liquid-solid phase transition temperature detection device and method for semiconductor refrigeration, so as to solve the problems of high price and large volume in the existing mainstream liquid-solid phase transition temperature measurement devices.

To achieve the above object, the present invention adopts the following technical solutions:

An active liquid-solid phase change temperature detection device for semiconductor refrigeration, including a temperature sensor, a cooling module, a semiconductor, a heat dissipation module, and a circuit module; the cooling module is connected above the semiconductor, and a temperature sensor is arranged above the cooling module; A cooling module is connected under the semiconductor, and a circuit module is arranged under the cooling module.

Further, the outside of the cooling module and the semiconductor are wrapped with heat insulating material except for the position where the temperature sensor and the heat dissipation module are connected; grooves are formed around the temperature sensor.

Further, a water circulation heat dissipation device is provided on the side of the heat dissipation module, and a heat dissipation material is provided outside the water circulation heat dissipation device.

Further, the circuit module includes a 7805 chip, a water pump, a power supply and an stm32 single-chip microcomputer; the stm32 single-chip microcomputer, the 7805 chip and the water pump are all connected to the power supply.

Further, the stm32 microcontroller is connected to the temperature sensor; the 7805 chip is used to reduce the power supply voltage to supply power to the temperature sensor; the water pump is used to supply water to the water circulation cooling device.

Further, the temperature sensor is a DS18B20 temperature sensor; the semiconductor is a TEC1-12706 semiconductor.

Further, a liquid-solid phase transition temperature detection method based on a semiconductor refrigeration active liquid-solid phase transition temperature detection device, the semiconductor refrigeration active liquid-solid phase transition temperature detection device includes a temperature sensor, a cooling module, a semiconductor , a heat dissipation module and a circuit module; the cooling module is connected above the semiconductor, and a temperature sensor is arranged above the cooling module; a heat dissipation module is connected below the semiconductor, and a circuit module is arranged below the heat dissipation module;

The circuit module includes 7805 chip, water pump, power supply and stm32 microcontroller; stm32 microcontroller, 7805 chip and water pump are all connected to the power supply;

The stm32 microcontroller is connected to the temperature sensor; the 7805 chip is used to reduce the power supply voltage to supply power to the temperature sensor;

The liquid-solid phase transition temperature detection method of the active liquid-solid phase transition temperature detection device based on semiconductor refrigeration comprises the following steps:

Step 1: Place the device in the environment where the liquid to be tested is located, fill the groove around the temperature sensor with the liquid to be tested, and turn on the power of the device;

Step 2: The temperature sensor uploads the temperature to the stm32 microcontroller every minute; the stm32 microcontroller uses the detection algorithm to obtain the liquid-solid phase transition temperature;

Step 3: Output the obtained liquid-solid phase transition temperature and turn off the power.

Further, the detection algorithm in step 2 includes the following steps:

1) Note that the system works at a fixed period t during the working process, and the recorded temperature sequence is T ₁ , T ₂ , T ₃ , ..., T _n ; compare the temperature changes in sequence, find out the first temperature minimum value and mark it as T _k ;

2) Extract three adjacent temperature coordinates T _k-3 , T _k-2 , T _k-1 from T _k forward respectively to form point sets (t _k-3 , T _k-3 ), (t _{k- 2} ,T _k-2 ), (t _k-1 ,T _k-1 ); extract three adjacent temperature coordinates T _k+1 , T _k+2 , T _k+3 backwards to form a point set (t _k+1 , T _k+1 ), (t _k+2 , T _k+2 ), (t _k+3 , T _k+3 );

3) Carry out linear fitting on the two sets of data sequences respectively, and use the Newton interpolation method to obtain the formula f(t)=f(t _k-3 )+f[t _k-3 ,t _k-2 ](tt _k-3 )+f[t _k-3 ,t _k-2 ,t _k-1 ](tt _k-3 )(tt _k-2 ) and g(t)=f(t _k+1 )+f[t _{k+ 1} ,t _k+2 ](tt _k+1 )+f[t _k+1 ,t _k+2 ,t _k+3 ](tt _k+1 )(tt _k+2 ), where the parameters are Newton interpolation The specific value obtained by the method; the former represents the linearized instantaneous liquid temperature drop process, and the latter represents the linearized temperature change process of the liquid-solid coexistence state, and its independent variables all represent temperature;

4) Obtain the intersection point of two linear changes by solving the equation f(x)=g(x), record it as T, and this temperature value is the detected liquid-solid phase transition temperature.

Compared with the prior art, the present invention has the following technical effects:

The device of the invention has low price of components and simple structure, and has the advantages of easy operation, large measurement temperature range, low cost and easy large-scale promotion compared with traditional large-scale measuring devices.

The device has compact structure, good cooling effect of water circulation system, small volume and accurate measurement results.

Description of drawings

Fig. 1 is the structural representation of device of the present invention;

Fig. 2 is the circuit module connection schematic diagram of the present invention;

Fig. 3 is the schematic diagram of the detection algorithm of the device of the present invention;

Fig. 4 is the temperature variation curve when pure water freezes that device of the present invention draws;

Fig. 5 is the temperature change curve when the salt solution freezes drawn by the device of the present invention.

Among them: 1. Temperature sensor; 2. Cooling module; 3. Semiconductor; 4. Heat insulation material; 5. Heat dissipation material; 6. Water circulation cooling device; 7. Heat dissipation material; 8. Circuit module.

detailed description

The present invention is further described below in conjunction with accompanying drawing:

An active liquid-solid phase change temperature detection device for semiconductor refrigeration, including a temperature sensor 1, a cooling module 2, a semiconductor 3, a heat dissipation module 5, and a circuit module 8; the cooling module 2 is connected above the semiconductor 3, and the cooling module A temperature sensor 1 is arranged above the semiconductor 2 ; a heat dissipation module 5 is connected below the semiconductor 3 , and a circuit module 8 is arranged below the heat dissipation module 5 .

The entire outside of the cooling module 2 and the semiconductor 3 is wrapped with a heat insulating material 4 except for the position where the temperature sensor 1 and the heat dissipation module 5 are connected; grooves are formed around the temperature sensor 1 .

A water circulation heat dissipation device 6 is provided on the side of the heat dissipation module 5 , and a heat dissipation material 7 is provided outside the water circulation heat dissipation device 6 .

The circuit module 8 includes a 7805 chip, a water pump, a power supply and a stm32 single-chip microcomputer; the stm32 single-chip microcomputer, the 7805 chip and the water pump are all connected to the power supply.

The stm32 microcontroller is connected to the temperature sensor 1; the 7805 chip is used to reduce the power supply voltage to supply power to the temperature sensor 1; the water pump is used to supply water to the water circulation cooling device 6.

Temperature sensor 1 is a DS18B20 temperature sensor; semiconductor 3 is a TEC1-12706 semiconductor.

The working principle of the present invention:

Step 1: Place the device in the environment where the liquid to be tested is located, fill the groove around the temperature sensor 1 with the liquid to be tested, and turn on the power of the device;

Step 2: The temperature sensor 1 uploads the temperature to the stm32 microcontroller every minute; the stm32 microcontroller uses the detection algorithm to obtain the liquid-solid phase transition temperature;

Step 3: Output the obtained liquid-solid phase transition temperature and turn off the power.

The detection algorithm in step 2 includes the following steps:

1) Note that the system works at a fixed period t during the working process, and the recorded temperature sequence is T ₁ , T ₂ , T ₃ , ..., T _n ; compare the temperature changes in sequence, find out the first temperature minimum value and mark it as T _k ;

2) Extract three adjacent temperature coordinates T _k-3 , T _k-2 , T _k-1 from T _k forward respectively to form point sets (t _k-3 , T _k-3 ), (t _{k- 2} ,T _k-2 ), (t _k-1 ,T _k-1 ); extract three adjacent temperature coordinates T _k+1 , T _k+2 , T _k+3 backwards to form a point set (t _k+1 , T _k+1 ), (t _k+2 , T _k+2 ), (t _k+3 , T _k+3 );

3) Carry out linear fitting on the two sets of data sequences respectively, and use the Newton interpolation method to obtain the formula f(t)=f(t _k-3 )+f[t _k-3 ,t _k-2 ](tt _k-3 )+f[t _k-3 ,t _k-2 ,t _k-1 ](tt _k-3 )(tt _k-2 ) and g(t)=f(t _k+1 )+f[t _{k+ 1} ,t _k+2 ](tt _k+1 )+f[t _k+1 ,t _k+2 ,t _k+3 ](tt _k+1 )(tt _k+2 ), where the parameters are Newton interpolation The specific value obtained by the method; the former represents the linearized instantaneous liquid temperature drop process, and the latter represents the linearized temperature change process of the liquid-solid coexistence state, and its independent variables all represent temperature;

4) Obtain the intersection point of two linear changes by solving the equation f(x)=g(x), record it as T, and this temperature value is the detected liquid-solid phase transition temperature.

Example 1:

As shown in Figure 4, the temperature sensor inputs 7 data of 16.3, 8.0, 1.4, -3.7, 0.5, 0.5, 0.5 to the data acquisition center, and the processed marked temperature is T ₄ =-3.7.

The fitting curve from (1, 16.3), (2, 8.0), (3, 1.4) is F(t)=16.3-8.3(t-1)+0.85(t-1)(t-2). The fitting curve from (5, 0.5), (6, 0.5), (7, 0.5) is L(t)=0.5.

The y-coordinate of the intersection of the two curves is y=0.5. The output temperature signal of the data acquisition center is 0.5°C.

Example 2:

As shown in Figure 5, the temperature sensor inputs 8 data of 9.5, 2.3, -3.1, -6.8, -4.4, -4.4, -4.9 to the data acquisition center, and the processed marked temperature is T ₅ = -6.8.

The fitting curve from (1, 9.5), (2, 2.3), (3, -3.1) is F(t)=9.5-7.2(t-2)+0.9(t-2)(t-3). The fitting curve from (5, -4.4), (6, -4.4), (7, -4.9) is L(t)=-4.4-0.25(t-6)(t-7).

The vertical coordinate of the intersection of the two curves is y=-5.6, and the output temperature signal of the data acquisition center is -5.6°C.

Claims (8)

1. the active liquid-solid-phase changeable temperature detection device of a kind of semiconductor refrigerating, it is characterised in that including temperature sensor (1), conduction cooling module (2), semiconductor (3), radiating module (5) and circuit module (8)；Conduction cooling module (2) is connected to semiconductor (3) Top, be provided with temperature sensor (1) above conduction cooling module (2)；Radiating module (5) is connected with below semiconductor (3), Circuit module (8) is provided with below radiating module (5).

2. a kind of active liquid-solid-phase changeable temperature detection device of semiconductor refrigerating according to claim 1, its feature exist In the outside of conduction cooling module (2) and semiconductor (3) entirety is except the position for being connected with temperature sensor (1) and radiating module (5) It is enclosed with heat-barrier material (4)；Groove is formed around temperature sensor (1).

3. a kind of active liquid-solid-phase changeable temperature detection device of semiconductor refrigerating according to claim 1, its feature exist In the side of radiating module (5) is provided with water circulation heat radiation device (6), and water circulation heat radiation device is provided with radiating on the outside of (6) Material (7).

4. a kind of active liquid-solid-phase changeable temperature detection device of semiconductor refrigerating according to claim 1, its feature exist In circuit module (8) includes 7805 chips, water pump, power supply and stm32 single-chip microcomputers；Stm32 single-chip microcomputers, 7805 chips and water pump It is all connected to power supply.

5. a kind of active liquid-solid-phase changeable temperature detection device of semiconductor refrigerating according to claim 4, its feature exist In stm32 single-chip microcomputers and temperature sensor (1) connection；7805 chips supply for reducing supply voltage to temperature sensor (1) Electricity；Water pump water supply circulation heat radiator (6) supplies water.

6. a kind of active liquid-solid-phase changeable temperature detection device of semiconductor refrigerating according to claim 1, its feature exist In temperature sensor (1) is DS18B20 temperature sensors；Semiconductor (3) is TEC1-12706 semiconductors.

7. a kind of liquid-solid-phase changeable temperature detection method of the active liquid-solid-phase changeable temperature detection device based on semiconductor refrigerating, its It is characterised by, the active liquid-solid-phase changeable temperature detection device of the semiconductor refrigerating includes temperature sensor (1), conduction cooling module (2), semiconductor (3), radiating module (5) and circuit module (8)；Conduction cooling module (2) is connected to the top of semiconductor (3), conduction cooling Temperature sensor (1) is provided with above module (2)；Radiating module (5), radiating module (5) are connected with below semiconductor (3) Lower section be provided with circuit module (8)；

Circuit module (8) includes 7805 chips, water pump, power supply and stm32 single-chip microcomputers；Stm32 single-chip microcomputers, 7805 chips and water pump It is all connected to power supply；

Stm32 single-chip microcomputers and temperature sensor (1) connection；7805 chips supply for reducing supply voltage to temperature sensor (1) Electricity；

The liquid-solid-phase changeable temperature detection method of the active liquid-solid-phase changeable temperature detection device based on semiconductor refrigerating, including Following steps：

Step 1：Device is placed in testing liquid local environment, prepare liquid is filled with the groove around temperature sensor (1) Body, starter power supply；

Step 2：Temperature sensor (1) uploaded temperature every one minute to stm32 single-chip microcomputers；Stm32 single-chip microcomputers are calculated using detection Method obtains liquid-solid-phase changeable temperature；

Step 3：Obtained liquid-solid-phase changeable temperature is exported, closes power supply.

8. a kind of liquid of active liquid-solid-phase changeable temperature detection device based on semiconductor refrigerating according to claim 7 is consolidated Phase transition temperature detection method, it is characterised in that the probe algorithm in step 2 comprises the following steps：

1) remember in system work process and worked with fixed cycle t, the temperature sequence of record is T₁、T₂、T₃、…、T_n；Compare in order Temperature change, find out first temperature minimum and be labeled as T_k；

2) respectively from T_k3 adjacent temperature coordinate T are extracted forward_k-3、T_k-2、T_k-1, form point set (t_k-3,T_k-3)、(t_k-2, T_k-2)、(t_k-1,T_k-1)；3 adjacent temperature coordinate T are extracted backward_k+1、T_k+2、T_k+3, form point set (t_k+1,T_k+1)、(t_k+2, T_k+2)、(t_k+3,T_k+3)；

3) linear fit is carried out respectively to two groups of data sequences, formula f (t)=f (t is respectively obtained using Newton interpolating method_k-3)+f [t_k-3,t_k-2](t-t_k-3)+f[t_k-3,t_k-2,t_k-1](t-t_k-3)(t-t_k-2) and g (t)=f (t_k+1)+f[t_k+1,t_k+2](t-t_k+1) +f[t_k+1,t_k+2,t_k+3](t-t_k+1)(t-t_k+2), wherein parameter is the concrete numerical value obtained using Newton interpolating method；The former The moment liquid temperature of linearisation declines process, and the latter represents the temperature changing process of the solid coexisting state of the liquid of linearisation, and it is certainly Variable represents temperature；

4) intersection point of two linear changes is obtained by solving Equation f (x)=g (x), is recorded as T, the temperature value is to detect The liquid-solid-phase changeable temperature arrived.