High-precision temperature control system and method based on multi-stage temperature control strategy

Abstract

The invention relates to a high-precision temperature control system and method based on a multi-stage temperature control strategy, and the system comprises a first-stage temperature control subsystem, a second-stage temperature control subsystem, a constant-temperature water circulation temperature control subsystem and a heat insulation water tank, the first-stage temperature control subsystem comprises a temperature control device, and water in the heat insulation water tank is subjected to heat exchange through the temperature control device; the temperature of the water in the heat insulation water tank is controlled, and constant-temperature water is obtained; the secondary temperature control subsystem comprises an industrial personal computer, a high-precision temperature measuring device and a power control device; the high-precision temperature measuring device collects temperature signals in real time and transmits the temperature signals to the industrial personal computer to obtain feedback adjusting signals, and the power control device precisely adjusts the temperature of the constant-temperature water according to the feedback adjusting signals. The constant-temperature water circulation temperature control subsystem comprises a circulating water pump, constant-temperature water in the heat insulation water tank is pumped through the circulating water pump to conduct heat exchange on the temperature control object, and therefore temperature control over the temperature control object is achieved. Compared with the prior art, the precision of temperature control is improved.

Description

Technical Field

[0001] The present invention relates to the field of temperature control technology, and in particular to a high-precision temperature control system and method based on a multi-stage temperature control strategy. Background Art

[0002] At present, there are many constant temperature water systems that have been applied in different fields. Common constant temperature water systems usually use a single temperature control method, such as adjusting the heating or cooling device through a simple proportional integral differential (PID) control algorithm to maintain the stability of the water temperature.

[0003] In some advanced constant temperature water systems, sensors are used to monitor the water temperature in real time and adjust the temperature based on the feedback signal. For example, temperature sensors such as thermocouples or thermistors are used to sense water temperature changes, and then the heating or cooling equipment is controlled by a controller.

[0004] In addition, some constant temperature water systems use intelligent control algorithms such as fuzzy control to improve the accuracy and stability of temperature control.

[0005] However, the existing constant temperature water system has some shortcomings. First, a single temperature control method is often difficult to meet the requirements of high-precision temperature control, especially in situations where the temperature changes greatly or the temperature stability requirements are extremely high. For example, when conducting certain precision experiments in the laboratory, even a small temperature fluctuation may have a significant impact on the experimental results.

[0006] Secondly, existing temperature sensors may have problems such as insufficient accuracy and slow response speed, which may lead to untimely temperature feedback and affect the effect of temperature control.

[0007] Furthermore, although some intelligent control algorithms have improved the accuracy of temperature control to a certain extent, the algorithms are complex, the amount of calculation is large, and the performance requirements of the controller are high, which increases the cost and complexity of the system. Summary of the invention

[0008] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a high-precision temperature control system and method based on a multi-stage temperature control strategy, thereby improving the accuracy of temperature control.

[0009] The purpose of the present invention can be achieved by the following technical solutions:

[0010] A high-precision temperature control system based on a multi-stage temperature control strategy, including: a primary temperature control subsystem, a secondary temperature control subsystem, a constant temperature water circulation temperature control subsystem and an insulated water tank.

[0011] The primary temperature control subsystem includes a temperature control device, which includes a ±0.1°C water cooler and a heat exchange coil, wherein the ±0.1°C water cooler and the heat exchange coil are connected via an insulated water pipe, and the water in the insulated water tank is heat-exchanged via the ±0.1°C water cooler and the heat exchange coil, thereby temperature-controlling the water in the insulated water tank to obtain constant temperature water;

[0012] The secondary temperature control subsystem includes an industrial computer, a high-precision temperature measuring device and a power control device. The high-precision temperature measuring device includes a desktop digital multimeter and a high-precision temperature sensor. The power control device includes a high-precision programmable power supply and an electric heating rod. The desktop digital multimeter collects the temperature signal of the high-precision temperature sensor in real time and transmits it to the industrial computer to obtain a feedback adjustment signal. The industrial computer adjusts the output current of the high-precision programmable power supply according to the feedback adjustment signal, and then adjusts the power of the electric heating rod, so as to precisely adjust the water temperature of the constant temperature water.

[0013] The constant temperature water circulation temperature control subsystem includes a circulating water pump, which is used to extract constant temperature water from the insulated water tank to exchange heat with the temperature-controlled object, thereby achieving temperature control of the temperature-controlled object. The circulating water pump, the temperature-controlled object and the insulated water tank are connected by an insulated water pipe.

[0014] Furthermore, the primary temperature control subsystem also includes a stirring device, which includes a stirring paddle motor and a stirring paddle, and the stirring paddle is driven by the stirring paddle motor to stir the constant temperature water in the insulated water tank.

[0015] Furthermore, the insulated water pipe is composed of a polyvinyl chloride water pipe with a rubber-plastic insulation pipe sheathed on the outside.

[0016] Furthermore, the insulated water tank is provided with a circulating water inlet and a circulating water outlet, the heating rod, the stirring paddle and the heat exchange coil are arranged on one side of the circulating water outlet of the insulated water tank, and the high-precision temperature sensor is arranged on the other side.

[0017] Furthermore, the feedback regulation signal is obtained by a PID control program set inside the industrial computer.

[0018] Furthermore, the heat-insulating water tank is wrapped with a low heat-conductivity material to perform heat insulation treatment.

[0019] Furthermore, the insulated water tank, the temperature-controlled object and the circulating water pump form a circulating water circuit.

[0020] Furthermore, the circulating water pump is arranged downstream of the circulating water circuit.

[0021] Furthermore, the circulating water pump draws constant temperature water from the insulated water tank through the circulating water inlet to perform heat exchange on the temperature-controlled object, and the constant temperature water that has completed the heat exchange is transported back to the insulated water tank through the circulating water outlet for temperature control again, and the constant temperature water that has completed the temperature control is again drawn into the circulating water circuit, thereby achieving the effect of circulating temperature control.

[0022] According to another aspect of the present invention, a high-precision temperature control method based on a multi-stage temperature control strategy is provided, comprising the following steps:

[0023] The water in the insulated water tank is heat exchanged by a ±0.1°C water chiller and a heat exchange coil, and the temperature of the water in the insulated water tank is controlled to obtain constant temperature water;

[0024] The temperature signal of the high-precision temperature sensor is collected in real time by a desktop digital multimeter, and transmitted to the industrial computer to obtain a feedback adjustment signal. The industrial computer adjusts the output current of the high-precision programmable power supply according to the feedback adjustment signal, and then adjusts the power of the electric heating rod, so as to precisely adjust the water temperature of the constant temperature water;

[0025] A circulating water pump is used to extract the constant temperature water in the insulating water tank to perform heat exchange on the temperature-controlled object, thereby achieving temperature control of the temperature-controlled object.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention is based on a multi-stage temperature control strategy, and uses a ±0.1℃ chiller in conjunction with a heat exchange coil to perform temperature control in an insulated water tank, completing the first-level temperature control subsystem; and uses a second-level temperature control subsystem to perform more precise temperature control on the constant temperature water, and uses multi-stage temperature control to achieve step-by-step temperature control. The constant temperature water finally obtained is passed through the constant temperature water circulation temperature control subsystem to exchange heat with the temperature control object to achieve the purpose of precise temperature control, thereby improving the temperature control accuracy.

[0028] 2. The present invention uses a circulating water pump to draw constant temperature water from the insulated water tank through the circulating water inlet to exchange heat with the temperature-controlled object, and transports the constant temperature water that has completed the heat exchange back to the insulated water tank through the circulating water outlet for temperature control again, and the constant temperature water that has completed the temperature control is again drawn into the circulating water circuit, thereby achieving the effect of circulating temperature control and saving energy consumption.

[0029] 3. The present invention provides a stirring device in the insulated water tank, and drives a stirring paddle through a stirring paddle motor to stir the constant temperature water in the insulated water tank, thereby promoting uniform mixing of heat, thereby obtaining constant temperature water with higher precision and improving temperature control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1This is a schematic diagram of the structure of a high-precision constant temperature water system based on multi-stage temperature control measurement proposed by the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure of the insulated water tank;

[0032] Legend: 1. Industrial computer; 2. Desktop digital multimeter; 3. High-precision programmable power supply; 4. Stirring paddle motor; 5. Insulated water tank; 6. ±0.1℃ chiller; 7. Temperature control object; 8. Circulating water pump; 9. High-precision temperature sensor; 10. Electric heating rod; 11. Heat exchange coil; 12. Stirring paddle; 13. Circulating water inlet; 14. Circulating water outlet. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0034] Abbreviations involved:

[0035] Proportional Integral Derivative: Proportional Integral Derivative, PID

[0036] Example 1

[0037] This embodiment provides a high-precision temperature control system based on a multi-level temperature control strategy, such as Figure 1 As shown, it includes: a primary temperature control subsystem, a secondary temperature control subsystem, a constant temperature water circulation temperature control subsystem and an insulating water tank 5,

[0038] The primary temperature control subsystem includes a temperature control device consisting of a ±0.1℃ water chiller 6 and a heat exchange coil 11, a stirring device consisting of a stirring paddle motor 4 and a stirring paddle 12, and an insulated water tank 5 as a temperature control carrier. The ±0.1℃ water chiller 6 and the heat exchange coil 11 are connected by an insulated water pipe, and the water in the insulated water tank 5 is heat-exchanged by the ±0.1℃ water chiller 6 and the heat exchange coil 11, thereby controlling the temperature of the water in the insulated water tank 5 to obtain constant temperature water;

[0039] Based on the primary temperature control subsystem, the secondary temperature control subsystem includes an industrial computer 1, a high-precision temperature measuring device and a power control device. The high-precision temperature measuring device includes a desktop digital multimeter 2 and a high-precision temperature sensor 9. The power control device includes a high-precision programmable power supply 3 and an electric heating rod 10. The temperature signal of the high-precision temperature sensor 9 is collected in real time by the desktop digital multimeter 2. The industrial computer 1 is provided with a PID control program inside, which is transmitted to the industrial computer 1 to obtain a feedback adjustment signal. The industrial computer 1 adjusts the output current of the high-precision programmable power supply 3 according to the feedback adjustment signal, and then adjusts the power of the electric heating rod 10, so as to precisely adjust the water temperature of the constant temperature water.

[0040] The constant temperature water circulation temperature control subsystem includes a circulating water pump 8, which uses the circulating water pump 8 to extract the constant temperature water in the insulated water tank 5 to exchange heat with the temperature control object 7, thereby realizing temperature control of the temperature control object 7. The circulating water pump 8, the temperature control object 7 and the insulated water tank 5 are connected by an insulated water pipe. The insulated water pipe is composed of a polyvinyl chloride water pipe with a rubber and plastic insulation pipe sheathed on the outside.

[0041] The primary temperature control subsystem also includes a stirring device, which includes a stirring paddle motor 4 and a stirring paddle 12. The stirring paddle motor 4 drives the stirring paddle 12 to stir the constant temperature water in the insulated water tank 5 to promote uniform temperature and achieve better temperature control effect.

[0042] The steps of temperature control of the high-precision temperature control system with the multi-stage temperature control strategy proposed in this embodiment include: exchanging heat with the water in the insulated water tank 5 through the ±0.1℃ water chiller 6 and the heat exchange coil 11, and then controlling the temperature of the water in the insulated water tank 5 to obtain constant temperature water; collecting the temperature signal of the high-precision temperature sensor 9 in real time through the desktop digital multimeter 2, transmitting it to the industrial computer 1 to obtain a feedback adjustment signal, and the industrial computer 1 adjusts the output current of the high-precision programmable power supply 3 according to the feedback adjustment signal, and then adjusts the power of the electric heating rod 10, thereby precisely adjusting the water temperature of the constant temperature water; using the circulating water pump 8 to extract the constant temperature water in the insulated water tank 5 for heat exchange with the temperature control object 7, thereby realizing temperature control of the temperature control object 7.

[0043] Example 2

[0044] This embodiment provides an internal structure of the heat insulation water tank 5, such as Figure 2 As shown, the insulated water tank 5 is provided with a circulating water inlet 13 and a circulating water outlet 14. The electric heating rod 10, the stirring paddle 12 and the heat exchange coil 11 are arranged on the side of the circulating water outlet 14 of the insulated water tank 5, and the high-precision temperature sensor 9 is arranged on the side of the circulating water inlet 13 of the insulated water tank 5. Since the stirring paddle 12, the heat exchange coil 11 and the electric heating rod 10 are arranged on the side of the circulating water outlet 14, the side of the circulating water outlet 14 can obtain more stable constant temperature water as the final temperature control medium.

[0045] The insulated water tank 5 is wrapped with a material with a low heat transfer coefficient for heat insulation treatment to reduce the impact of heat intrusion on the overall temperature control accuracy. The circulating water pump 8 extracts the constant temperature water in the insulated water tank 5 from the circulating water inlet 13 to exchange heat with the temperature control object 7, and the constant temperature water that has completed the heat exchange is transported back to the insulated water tank 5 through the circulating water outlet 14 for temperature control again. The constant temperature water that has completed the temperature control is extracted into the circulating water circuit again, thereby achieving the effect of circulating temperature control. The circulating water pump 8 is set downstream of the circulating water circuit to prevent the thermal pollution of the circulating water pump 8 from affecting the temperature control effect of the temperature control object 7.

[0046] The rest is the same as in Example 1.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A high-precision temperature control system based on a multi-level temperature control strategy, characterized in that: include: The primary temperature control subsystem, the secondary temperature control subsystem, the constant temperature water circulation temperature control subsystem and the insulated water tank (5) are The primary temperature control subsystem comprises a temperature control device, the temperature control device comprises a ±0.1°C water cooler (6) and a heat exchange coil (11), the ±0.1°C water cooler (6) and the heat exchange coil (11) are connected via an insulating water pipe, and the water in the insulated water tank (5) is heat-exchanged via the ±0.1°C water cooler (6) and the heat exchange coil (11), thereby controlling the temperature of the water in the insulated water tank (5) to obtain constant temperature water; The secondary temperature control subsystem comprises an industrial computer (1), a high-precision temperature measuring device and a power control device, wherein the high-precision temperature measuring device comprises a desktop digital multimeter (2) and a high-precision temperature sensor (9), and the power control device comprises a high-precision programmable power supply (3) and an electric heating rod (10); the desktop digital multimeter (2) collects the temperature signal of the high-precision temperature sensor (9) in real time, and transmits the temperature signal to the industrial computer (1) to obtain a feedback adjustment signal; the industrial computer (1) adjusts the output current of the high-precision programmable power supply (3) according to the feedback adjustment signal, and further adjusts the power of the electric heating rod (10), thereby precisely adjusting the water temperature of the constant temperature water; The constant temperature water circulation temperature control subsystem comprises a circulation water pump (8), which is used to extract the constant temperature water in the insulated water tank (5) to exchange heat with the temperature control object (7), thereby achieving temperature control of the temperature control object (7); the circulation water pump (8), the temperature control object (7) and the insulated water tank (5) are connected by an insulated water pipe.

2. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1 is characterized in that: The primary temperature control subsystem further comprises a stirring device, wherein the stirring device comprises a stirring paddle motor (4) and a stirring paddle (12), and the stirring paddle motor (4) drives the stirring paddle (12) to stir the constant temperature water in the insulating water tank (5).

3. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1 is characterized in that: The heat-insulating water pipe is composed of a polyvinyl chloride water pipe with a rubber-plastic heat-insulating pipe sheathed on the outside.

4. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1 is characterized in that: The insulated water tank (5) is provided with a circulating water inlet (13) and a circulating water outlet (14); the heating rod (10), the stirring paddle (12) and the heat exchange coil (11) are arranged on one side of the circulating water outlet (14) of the insulated water tank (5); and the high-precision temperature sensor (9) is arranged on the other side.

5. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1, characterized in that: The feedback adjustment signal is obtained by a PID control program set inside the industrial computer (1).

6. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1, characterized in that: The heat-insulating water tank (5) is wrapped with a low heat-conductivity material for heat insulation.

7. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 1, characterized in that: The insulating water tank (5), the temperature-controlled object (7) and the circulating water pump (8) form a circulating water circuit.

8. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 7, characterized in that: The circulating water pump (8) is arranged downstream of the circulating water circuit.

9. The high-precision temperature control system based on a multi-level temperature control strategy according to claim 7, characterized in that: The circulating water pump (8) draws constant temperature water from the insulating water tank (5) through the circulating water inlet (13) to perform heat exchange on the temperature-controlled object (7); the constant temperature water that has completed the heat exchange is transported back to the insulating water tank (5) through the circulating water outlet (14) to perform temperature control again; the constant temperature water that has completed the temperature control is again drawn into the circulating water circuit, thereby achieving the effect of circulating temperature control.

10. A temperature control method using a high-precision temperature control system based on a multi-stage temperature control strategy as described in any one of claims 1 to 9, characterized in that: The following steps are involved: The water in the insulated water tank (5) is heat exchanged by a ±0.1°C water chiller (6) and a heat exchange coil (11), and the temperature of the water in the insulated water tank (5) is then controlled to obtain constant temperature water; The temperature signal of the high-precision temperature sensor (9) is collected in real time by a desktop digital multimeter (2), and transmitted to the industrial computer (1) to obtain a feedback adjustment signal. The industrial computer (1) adjusts the output current of the high-precision programmable power supply (3) according to the feedback adjustment signal, and then adjusts the power of the electric heating rod (10), thereby precisely adjusting the water temperature of the constant temperature water; A circulating water pump (8) is used to extract constant temperature water from the insulating water tank (5) to perform heat exchange on the temperature-controlled object (7), thereby achieving temperature control of the temperature-controlled object (7).

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