Temperature control device for testing membrane electrode

Abstract

The utility model discloses a temperature control device for a membrane electrode test, relates to the technical field of membrane electrode tests, and aims to solve the problems of poor cooling control precision and non-ideal cooling control caused by uncontrollable air volume in the conventional membrane electrode test. According to the technical scheme, the device is characterized by comprising a cold-hot double-control instrument, a solid-state relay, a heater, a PWM speed regulation fan and a PWM signal conversion module, when the temperature of a membrane electrode exceeds a set temperature, the cold-hot double-control instrument and an instrument with a cold-hot double-control function start PID cooling control, the cooling control outputs an analog quantity 4-20 mA signal, continuous regulation of the air volume is achieved, and the temperature of the membrane electrode is controlled by the solid-state relay. According to the PWM signal conversion module, the output of the instrument cannot be directly butted with the air volume setting of the fan, so that the signal conversion module is adopted in the middle, and a 4-20 mA signal is converted into a PWM signal which can be identified by the fan. And the effect of facilitating test and use is achieved.

Description

Technical Field

[0001] This utility model relates to the field of membrane electrode testing technology, and in particular to a temperature control device for membrane electrode testing. Background Technology

[0002] Membrane electrode assembly (MEA) is a core component of fuel cells (such as proton exchange membrane fuel cells, PEMFCs) or electrolyzers (such as proton exchange membrane water electrolyzers, PEMWEs), and its performance directly determines the efficiency, lifespan, and cost of the entire electrochemical device. Therefore, systematic, comprehensive, and standardized testing is crucial. During MEA testing, temperature control is essential, and the accuracy of temperature control directly affects MEA performance.

[0003] In existing testing solutions, heating control typically uses a heating element and a temperature controller with PID control, which is relatively accurate. However, cooling control is less than ideal. Currently, cooling control mainly relies on manual fan control or over-temperature alarm contacts on the temperature controller. When the temperature exceeds the set temperature, the contact closes, starting the cooling fan; when the set temperature is reached, the contact opens, stopping the fan. This method suffers from poor cooling control accuracy due to uncontrollable airflow. To achieve better cooling, operators frequently need to adjust the distance and angle between the fan and the membrane electrode assembly (MEA), resulting in slow response times and significant temperature overshoot and hysteresis. This inadequate cooling control often causes step-shaped changes in the MEA performance curve, negatively impacting test results. Utility Model Content

[0004] The purpose of this invention is to provide a temperature control device for membrane electrode testing.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The temperature control device for membrane electrode testing includes a dual-control instrument for cooling and heating, a solid-state relay, a heater, a PWM speed-regulating fan, and a PWM signal conversion module. The dual-control instrument for cooling and heating functions to control both cooling and heating. When the membrane electrode temperature exceeds the set temperature, the instrument starts PID cooling control. The cooling control output is an analog 4-20mA signal to realize continuous adjustment of the air volume.

[0007] The solid-state relay can quickly switch circuits to achieve cold and hot control of the instrument.

[0008] The heater is used to raise the temperature when the temperature is too low to meet the test temperature requirements.

[0009] The PWM speed-regulating fan controls the fan speed by changing the pulse width of the power signal. When the pulse width is narrow, the fan speed is low, and when the pulse width is wide, the fan speed is high. PWM speed regulation can achieve very precise speed control.

[0010] The PWM signal conversion module is used because the instrument output cannot be directly connected to the fan airflow setting. Therefore, a signal conversion module is used to convert the 4-20mA signal into a PWM signal that the fan can recognize.

[0011] By adopting the above technical solution, when the membrane electrode temperature exceeds the set temperature, the dual-control instrument for cooling and heating starts PID cooling control. The cooling control output is an analog 4-20mA signal to realize continuous adjustment of air volume.

[0012] Furthermore, pins 1 and 2 of the dual-control instrument for both cooling and heating are connected to 220V AC power. Pin 3 of the dual-control instrument for both cooling and heating is electrically connected to pin A1 of the solid-state relay. Pin 4 of the dual-control instrument for both cooling and heating is electrically connected to pin A2 of the solid-state relay. Pin 1 of the solid-state relay is connected to 220V AC power. Pin 2 of the solid-state relay is electrically connected to one end of the heater. The other end of the heater is connected to 220V AC power.

[0013] By adopting the above technical solution, solid-state relays can quickly switch circuits to achieve cold and hot control of instruments with dual control of cold and hot circuits.

[0014] Furthermore, pin 7 of the dual-control instrument for hot and cold is electrically connected to the ground terminal of the PWM signal conversion module, pin 9 of the dual-control instrument for hot and cold is electrically connected to pin A1 of the PWM signal conversion module, pin 14 of the PWM signal conversion module is electrically connected to the ground terminal of the PWM speed-regulating fan, and pin 10 of the PWM signal conversion module is electrically connected to the PWM input terminal of the PWM speed-regulating fan.

[0015] By adopting the above technical solution, since the output of the dual-control instrument for hot and cold air cannot be directly connected to the airflow setting of the PWM speed-regulating fan, a PWM signal conversion module is used in the middle to convert the 4-20mA signal into a PWM signal that the PWM speed-regulating fan can recognize, and the PWM speed-regulating fan starts to cool down.

[0016] In summary, the beneficial technical effects of this utility model are as follows:

[0017] The system employs a dual-control instrument for both cooling and heating, along with a PWM speed-regulating fan. This primarily improves the cooling control in the original membrane electrode temperature control system by replacing the original alarm point switch control with PID control. The dual-control instrument can adjust the cooling airflow based on the real-time temperature of the membrane electrode, significantly improving temperature control accuracy and ensuring the accuracy of test parameters. When the membrane electrode overheats, the cooling airflow can be continuously adjusted to ensure that the membrane electrode is tested under a constant ambient temperature, accurately reflecting the true performance of the membrane electrode and providing a convenient testing experience. Attached Figure Description

[0018] Figure 1 This is the electrical schematic diagram of the fuel cell temperature control system of this utility model;

[0019] Figure 2 This is a functional diagram of the fuel cell temperature control system of this utility model. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the accompanying drawings.

[0021] Reference Figure 1-2 The temperature control device for membrane electrode testing includes a dual-control instrument for both cooling and heating, a solid-state relay (SSR), a heater (HTR 001), a PWM speed-regulating fan (RAD001), and a PWM signal conversion module. The dual-control instrument, with its dual-control function, activates PID cooling control when the membrane electrode temperature exceeds the set temperature. The cooling control output is a 4-20mA analog signal, enabling continuous adjustment of the airflow. The solid-state relay can quickly switch circuits to achieve cooling and heating control. The heater heats the device when the temperature is too low to meet the testing requirements. The PWM speed-regulating fan controls its speed by changing the pulse width of the power signal; a narrower pulse width results in a lower fan speed, while a wider pulse width results in a higher fan speed, allowing for very precise speed control. The PWM signal conversion module is used because the instrument output cannot be directly interfaced with the fan airflow setting; it converts the 4-20mA signal into a PWM signal that the fan can recognize.

[0022] like Figure 1-2As shown, pins 1 and 2 of the dual-control instrument for both cooling and heating are connected to 220V AC power. Pin 3 of the dual-control instrument for both cooling and heating is electrically connected to pin A1 of the solid-state relay. Pin 4 of the dual-control instrument for both cooling and heating is electrically connected to pin A2 of the solid-state relay. Pin 1 of the solid-state relay is connected to 220V AC power. Pin 2 of the solid-state relay is electrically connected to one end of the heater. The other end of the heater is connected to 220V AC power. Pin 7 of the dual-control instrument for both cooling and heating is electrically connected to the ground terminal of the PWM signal conversion module. Pin 9 of the dual-control instrument for both cooling and heating is electrically connected to pin A1 of the PWM signal conversion module. Pin 14 of the PWM signal conversion module is electrically connected to the ground terminal of the PWM speed-regulating fan. Pin 10 of the PWM signal conversion module is electrically connected to the PWM input terminal of the PWM speed-regulating fan.

[0023] The implementation principle of this embodiment is as follows: In order to achieve precise control of the cooling process, continuous control of the fan airflow is required. A fan with PWM speed regulation function was selected, and an instrument with dual cooling and heating control function was used. When the membrane electrode temperature exceeds the set temperature, the dual cooling and heating control instrument starts PID cooling control. The cooling control output is an analog 4-20mA signal to achieve continuous adjustment of the airflow. Since the output of the dual cooling and heating control instrument cannot be directly connected to the fan airflow setting, a signal conversion module is used in the middle to convert the 4-20mA signal into a PWM signal that the fan can recognize. The cooling process is carried out by the PWM speed-regulating fan. When the membrane electrode overheats, the cooling airflow can be continuously adjusted to ensure that the membrane electrode is tested under a constant ambient temperature, which accurately reflects the true performance of the membrane electrode.

[0024] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A temperature control device for membrane electrode testing, comprising a dual-control instrument for both hot and cold heating, a solid-state relay, a heater, a PWM speed-regulating fan, and a PWM signal conversion module, characterized in that: The aforementioned dual-control instrument for both cooling and heating, when the membrane electrode temperature exceeds the set temperature, the instrument activates PID cooling control, and the cooling control output is an analog 4-20mA signal to achieve continuous adjustment of the air volume; The solid-state relay can quickly switch circuits to achieve cold and hot control of the instrument. The heater is used to raise the temperature when the temperature is too low to meet the test temperature requirements. The PWM speed-regulating fan controls the fan speed by changing the pulse width of the power signal. When the pulse width is narrow, the fan speed is low, and when the pulse width is wide, the fan speed is high. PWM speed regulation can achieve very precise speed control. The PWM signal conversion module is used because the instrument output cannot be directly connected to the fan airflow setting. Therefore, a signal conversion module is used to convert the 4-20mA signal into a PWM signal that the fan can recognize.

2. The temperature control device for membrane electrode testing according to claim 1, characterized in that: Pins 1 and 2 of the dual-control instrument for both heating and cooling are connected to 220V AC power. Pin 3 of the dual-control instrument for heating and cooling is electrically connected to pin A1 of the solid-state relay. Pin 4 of the dual-control instrument for heating and cooling is electrically connected to pin A2 of the solid-state relay. Pin 1 of the solid-state relay is connected to 220V AC power. Pin 2 of the solid-state relay is electrically connected to one end of the heater. The other end of the heater is connected to 220V AC power.

3. The temperature control device for membrane electrode testing according to claim 1, characterized in that: Pin 7 of the dual-control instrument for hot and cold is electrically connected to the ground terminal of the PWM signal conversion module. Pin 9 of the dual-control instrument for hot and cold is electrically connected to pin A1 of the PWM signal conversion module. Pin 14 of the PWM signal conversion module is electrically connected to the ground terminal of the PWM speed-regulating fan. Pin 10 of the PWM signal conversion module is electrically connected to the PWM input terminal of the PWM speed-regulating fan.

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