A multi-connection calibration device for a hydrogen concentration sensor module

Abstract

The utility model provides a kind of multiple connection calibration device of hydrogen concentration sensor module, applied to sensor calibration technical field, including calibration carrier plate and calibration chamber, multiple sensor modules are assembled on calibration carrier plate, multiple sensor modules are connected in parallel between;Sensor module includes circuit board and sensor main body, sensor main body and circuit board electrically connected, stamp hole interface is provided on circuit board, calibration carrier plate is equipped with stamp hole test needle;Calibration chamber has the cavity of accommodating calibration carrier plate and multiple sensor modules inside;Calibration chamber is equipped with air inlet and power supply communication interface respectively, air inlet is used to inject test gas into calibration chamber, power supply communication interface is used to power supply calibration carrier plate and communication with external equipment.This multiple connection calibration device can realize multiple module parallel calibration, improve calibration consistency and improve calibration efficiency, and is suitable for hydrogen concentration sensor module large-scale calibration application.

Description

Technical Field

[0001] This utility model belongs to the field of sensor calibration technology, specifically relating to a multi-unit calibration device for a hydrogen concentration sensor module. Background Technology

[0002] A thermal conductivity gas sensor is a sensing device that measures gas concentration by detecting differences in the thermal conductivity of gases. Its working principle is as follows: when the target gas comes into contact with a reference gas, the sensitive element inside the sensor experiences a temperature change due to the difference in thermal conduction. The concentration of the target gas is determined by measuring this temperature change. Hydrogen has a significantly higher thermal conductivity than other gases, therefore thermal conductivity gas sensors are widely used for hydrogen measurement. A hydrogen concentration sensor module consists of a hydrogen sensor probe, signal conditioning circuitry, analog-to-digital conversion circuitry, and a microcontroller.

[0003] Calibration of a hydrogen concentration sensor module is the process of establishing the relationship between hydrogen concentration and the module's output signal. During the production of hydrogen concentration sensor modules, calibration is required to ensure the consistency of the output of each module.

[0004] The limitations and shortcomings of existing technologies: The thermal conductivity of a gas is closely related to ambient temperature, humidity, and pressure. Therefore, the calibration of thermal conductivity hydrogen concentration sensors requires a stable temperature, humidity, and pressure environment. For the calibration of small hydrogen concentration sensor modules, we need to provide a stable gas source, a suitable calibration chamber, and data acquisition and transmission interfaces. Traditional calibration of a single module requires the creation of a suitable calibration fixture for each module, which is costly and inefficient. The consistency of batch calibration also varies, making large-scale application impossible. Utility Model Content

[0005] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a multi-module calibration device for hydrogen concentration sensor modules, which can realize parallel calibration of multiple modules, improve calibration consistency and increase calibration efficiency, and is suitable for large-scale calibration applications of hydrogen concentration sensor modules.

[0006] A multi-unit calibration device for hydrogen concentration sensor modules includes a calibration carrier plate and a calibration chamber. Multiple sensor modules are mounted on the calibration carrier plate in a horizontal array and connected in parallel. Each sensor module includes a circuit board and a sensor body, which is electrically connected to the circuit board. The circuit board has a stamp hole interface. The calibration carrier plate is equipped with a stamp hole test probe that mates with the stamp hole interface. The calibration chamber has an internal cavity to accommodate the calibration carrier plate and the multiple sensor modules. Both ends of the calibration chamber are closable to keep the cavity sealed during calibration. Each end of the calibration chamber is equipped with an air inlet and a power supply / communication interface. The air inlet is used to inject test gas into the calibration chamber, and the power supply / communication interface is used to power the calibration carrier plate and communicate with external devices.

[0007] Preferably, the power supply terminals of multiple sensor modules are all connected to a power source and are each connected to a CAN transceiver for communication.

[0008] Preferably, the calibration chamber is equipped with a temperature and humidity sensor and a pressure sensor. The temperature and humidity sensor is used to monitor the ambient temperature and humidity inside the calibration chamber, and the pressure sensor is used to monitor the ambient pressure inside the calibration chamber.

[0009] Preferably, the calibration chamber is provided with a fixing member and a connecting member at both ends. The fixing member is connected to the calibration chamber, and the connecting member is detachably connected to the fixing member by a fixing bolt.

[0010] Preferably, the calibration carrier plate has sliding plates on its two opposite side walls, and the inner wall of the calibration chamber has a sliding groove that mates with the sliding plate. The sliding plate and the sliding groove are slidably connected to guide the calibration carrier plate into and out of the calibration chamber.

[0011] Preferably, the bottom of both ends of the calibration carrier plate is provided with mounting grooves, and a support plate is connected to the mounting groove through a rotating shaft. The support plate can be flipped between the storage state and the support state.

[0012] Preferably, the bottom of the calibration carrier plate is connected to a baffle via a pivot at the position corresponding to the mounting groove. The baffle is used to limit and fix the support plate when the support plate is in the storage state.

[0013] The beneficial effects of this utility model are: the multi-connection calibration device for the hydrogen concentration sensor module, Multiple horizontal array calibration stations are set on the calibration carrier board, enabling multiple hydrogen concentration sensor modules to be arrayed and loaded in parallel. Parallel power supply and independent communication acquisition based on CAN transceiver are adopted. This improves the throughput of a single calibration while avoiding the impact of a single module failure on other modules, thereby significantly improving the efficiency and stability of batch calibration.

[0014] By setting a stamp hole interface on the circuit board and configuring a stamp hole test probe at the workstation to achieve snap-fit ​​clamping and electrical connection, clamping time can be effectively reduced and the risk of mechanical damage to the module can be reduced. It can also suppress signal fluctuations caused by module loosening during calibration, and improve installation reliability and reusability.

[0015] By incorporating detachable closure structures at both ends of the calibration chamber to form a sealed cavity, and providing air inlets and power / communication interfaces at each end, the calibration process achieves excellent sealing, ease of maintenance, and external compatibility. Furthermore, the simultaneous air intake from both ends allows for opposing mixing of gases within the chamber, accelerating concentration equalization, shortening the time required to reach steady state, and, combined with temperature and humidity sensors and pressure sensors for monitoring / controlling calibration temperature, humidity, and chamber pressure, reduces the impact of environmental fluctuations on the calibration curve. This improves calibration consistency and result reliability, reduces calibration costs, and facilitates large-scale application.

[0016] The guide structure of the slide plate and chute improves the stability of the carrier plate entering and exiting and reduces the risk of collision and displacement. The flip-up support plate and baffle limiting structure ensure that the two ends of the carrier plate remain at the same height when it is pulled out of the cavity for material replacement, which facilitates operation and reduces calibration deviation caused by secondary displacement. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the top structure of the calibration carrier plate of this utility model; Figure 2 This is a structural schematic diagram of the calibration station of this utility model; Figure 3 This is a schematic diagram of the calibration chamber of this utility model; Figure 4 This is a schematic diagram of the bottom structure of the calibration carrier plate of this utility model; Figure 5 This is a schematic diagram of the support plate of this utility model in a supported state; Figure 6 This is a circuit block diagram of the multi-connection calibration of this utility model.

[0018] The following are labeled in the diagram: 1. Calibration carrier plate; 2. Slide plate; 3. Circuit board; 4. Sensor body; 5. Stamp hole test probe; 6. Stamp hole interface; 7. Calibration chamber; 8. Fixture; 9. Connector; 10. Power supply and communication interface; 11. Air inlet; 12. Mounting slot; 13. Support plate; 14. Baffle. Detailed Implementation

[0019] Example 1 A multi-unit calibration device for a hydrogen concentration sensor module includes a calibration carrier plate 1 and a calibration chamber 7.

[0020] like Figure 1 , Figure 6 As shown, the calibration carrier board 1 has multiple calibration stations arranged in a horizontal array. These stations are used to assemble sensor modules, allowing for an array distribution of multiple sensor modules. The sensor modules are connected in parallel, and their power supply terminals are all connected to a power source for unified power supply. Simultaneously, each sensor module is connected to a CAN transceiver for signal transmission. Because the sensor modules are connected in parallel, the calibration process is not affected by the failure of a single module, and data acquisition and comparison of multiple sensor modules can be completed simultaneously.

[0021] like Figure 1 , Figure 2 As shown, the sensor module includes a circuit board 3 and a sensor body 4. The sensor body 4 is electrically connected to the circuit board 3. The circuit board 3 is provided with a stamp hole interface 6. At the same time, a stamp hole test pin 5, which works with the stamp hole interface 6, is arranged at the corresponding calibration position on the calibration carrier plate 1. The sensor module is quickly clamped onto the calibration carrier plate 1 by the snap-fit ​​action between the stamp hole test pin 5 and the stamp hole interface 6, preventing the sensor module from falling off and avoiding damage. The stamp hole test pin 5 is an elastic test pin structure to achieve stable electrical connection while snapping and clamping.

[0022] like Figure 3 As shown, the calibration chamber 7 has a cavity inside that accommodates the calibration carrier plate 1 and multiple sensor modules. The two ends of the calibration chamber 7 are closed by the cooperation between the fixing member 8 and the connecting member 9. The fixing member 8 is connected to both ends of the calibration chamber 7, and the connecting member 9 is detachably connected to the fixing member 8 by fixing bolts, so that the interior of the calibration chamber 7 remains sealed during the calibration process.

[0023] Furthermore, the calibration chamber 7 is equipped with an air inlet 11 and a power supply and communication interface 10 at its two ends, respectively. The air inlet 11 is used to inject test gas into the calibration chamber 7. In this embodiment, the sensor module is a hydrogen concentration sensor module, so hydrogen is injected into the calibration chamber 7.

[0024] Injecting hydrogen gas into the calibration chamber 7 through the inlets 11 at both ends improves the efficiency of gas injection. Compared to single-sided injection, simultaneous injection from both sides creates a counter-current effect, quickly balancing the gas concentration within the chamber. Furthermore, the calibration chamber 7 is equipped with temperature and humidity sensors and a pressure sensor. The temperature and humidity sensors monitor the calibration temperature and humidity, while the pressure sensor controls the internal gas pressure to ensure the chamber environment meets calibration requirements.

[0025] Calibrating multiple sensor modules within the same cavity reduces individual variability and improves the consistency of calibration results. Simultaneously, it increases calibration efficiency, reduces calibration costs, and facilitates large-scale applications.

[0026] Working Principle: This multi-unit calibration device for hydrogen concentration sensor modules involves sequentially assembling multiple sensor modules onto the calibration carrier plate 1 at their respective calibration stations. The modules are clamped and electrically connected via the stamp hole test probe 5 and the stamp hole interface 6. The calibration carrier plate 1 is then placed into the cavity of the calibration chamber 7, and both ends are closed to achieve a seal. Power is supplied to the calibration carrier plate 1 through the power and communication interface 10, and communication with external devices is established. Test gas is simultaneously injected into the chamber through the two air inlets 11, and environmental stabilization is achieved under the monitoring / control of temperature, humidity, and pressure sensors. Each sensor module outputs calibration signals via a CAN transceiver for acquisition and processing, completing the parallel calibration of multiple modules. Calibrating multiple sensor modules within the same chamber reduces individual differences, improves the consistency of calibration results, increases calibration efficiency, reduces calibration costs, and facilitates large-scale applications.

[0027] Example 2 like Figure 4 , Figure 5 As shown, the structure of this embodiment is basically the same as that of Embodiment 1. The difference is that the calibration carrier plate 1 in this embodiment is equipped with sliding plates 2 on its opposite side walls. Correspondingly, the inner wall of the calibration chamber 7 is provided with a sliding groove that works with the sliding plates 2. Through the sliding connection between the sliding plates 2 and the sliding groove, the stability of the calibration carrier plate 1 entering the calibration chamber 7 can be improved, and the calibration results can be avoided due to the displacement of the sensor module caused by external force collision.

[0028] Furthermore, mounting grooves 12 are respectively provided at the bottom of both ends of the calibration carrier plate 1. A support plate 13 is connected to the inside of the mounting groove 12 via a rotating shaft. A baffle 14 is also connected to the bottom of the calibration carrier plate 1 at the position corresponding to the mounting groove 12 via a rotating shaft. When the support plate 13 is inside the mounting groove 12, it is limited and fixed by the baffle 14. After rotating the baffle 14, the support plate 13 can be rotated out and abut against the ground plane to achieve the support function.

[0029] like Figure 5As shown, when loading or unloading the sensor module, the calibration carrier plate 1 needs to be pulled out to the outside of the calibration chamber 7. When the sensor module needs to be replaced, removed or otherwise operated, one end of the calibration carrier plate 1 is mounted inside the calibration chamber 7 through the cooperation of the slide plate 2 and the slide groove. The other end of the calibration carrier plate 1 is made to abut against the plane by rotating the support plate 13 to provide support force, so that both ends of the calibration carrier plate 1 can be on the same horizontal plane, which is convenient for the operator to operate.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-unit calibration device for a hydrogen concentration sensor module, characterized in that, It includes a calibration carrier plate and a calibration chamber. The calibration carrier plate is equipped with multiple sensor modules arranged in a horizontal array and connected in parallel. The sensor module includes a circuit board and a sensor body. The sensor body is electrically connected to the circuit board. The circuit board is provided with a stamp hole interface. The calibration carrier is provided with a stamp hole test probe that is used in conjunction with the stamp hole interface. The calibration chamber has an internal cavity that accommodates a calibration carrier plate and multiple sensor modules. Both ends of the calibration chamber can be closed to keep the cavity sealed during the calibration process. The calibration chamber is equipped with an air inlet and a power supply and communication interface at both ends. The air inlet is used to inject test gas into the calibration chamber, and the power supply and communication interface is used to supply power to the calibration carrier and communicate with external devices.

2. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 1, characterized in that, The power supply terminals of multiple sensor modules are all connected to the power supply, and each is also connected to a CAN transceiver for communication.

3. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 1, characterized in that, The calibration chamber is equipped with a temperature and humidity sensor and a pressure sensor. The temperature and humidity sensor is used to monitor the ambient temperature and humidity inside the calibration chamber, and the pressure sensor is used to monitor the ambient pressure inside the calibration chamber.

4. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 1, characterized in that, The calibration chamber is equipped with a fixing component and a connecting component at both ends. The fixing component is connected to the calibration chamber, and the connecting component is detachably connected to the fixing component by fixing bolts.

5. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 1, characterized in that, The calibration carrier plate has sliding plates on its two opposite side walls, and the inner wall of the calibration chamber has a sliding groove that mates with the sliding plate. The sliding plate and the sliding groove are slidably connected to guide the calibration carrier plate into and out of the calibration chamber.

6. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 1, characterized in that, The calibration carrier plate has mounting slots at the bottom of both ends. A support plate is connected to the mounting slot through a rotating shaft. The support plate can be flipped between the storage state and the support state.

7. The multi-unit calibration device for the hydrogen concentration sensor module according to claim 6, characterized in that, The bottom of the calibration carrier plate is connected to a baffle via a pivot at the position corresponding to the mounting groove. The baffle is used to limit and fix the support plate when the support plate is in the storage state.

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