Sealing cavity water vapor content detection device based on surface condensation detection

Abstract

The utility model discloses a sealed cavity water vapor content detection device based on surface condensation detection, and relates to the technical field of water vapor content detection, a shell internally comprises a control processing unit, a refrigeration unit and a detection unit, the refrigeration unit and the detection unit are electrically connected with the control processing unit, one side of the shell is a detection surface, and the refrigeration unit penetrates through the detection surface to be in contact with the outer wall of a sealed cavity. The detection unit obtains temperature and diffuse reflection signal data of the outer wall of the cavity and sends the data to the control processing unit, and the control processing unit obtains the water vapor content according to the data of the outer wall of the cavity. The integrity of the sealing cavity does not need to be damaged in the detection process, detection can be started only by making the heat transfer block of the refrigeration unit make contact with the outer wall of the sealing cavity, damage to the sealing performance of the cavity caused by traditional intrusive detection is avoided, the cavity does not need to be disassembled by shutdown, and the online detection device is particularly suitable for online detection of the sealing cavity of industrial equipment.

Description

Technical Field

[0001] This utility model relates to the field of water vapor content detection technology, specifically a water vapor content detection device for a sealed cavity based on surface condensation detection. Background Technology

[0002] In fields such as power, communications, automotive, and aerospace, a large number of devices use sealed cavities (such as battery packs, junction boxes, and optical device housings) for protection. The airtightness of these cavities is crucial; if water or excessive humidity enters, it can lead to serious problems such as short circuits, corrosion, and failure.

[0003] Traditional methods for detecting moisture content in sealed cavities all have certain shortcomings. For example, disassembling the cavity is required, which will damage the seal. In addition to completing the disassembly and assembly process on-site, it is also necessary to replace the seals and perform complex operations such as drying, nitrogen filling, and leak detection inside the cavity. For example, the pressure attenuation method (leak detection) requires reserved interfaces and may damage the cavity. In situations where on-site conditions are limited, this operation is time-consuming, labor-intensive, and carries certain risks. Methods that integrate humidity sensors internally are costly and not applicable to existing products. Utility Model Content

[0004] In view of the above-mentioned shortcomings and deficiencies, this utility model provides a sealed cavity water vapor content detection device based on surface condensation detection to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the main technical solution adopted by this utility model is a sealing cavity water vapor content detection device based on surface condensation detection, comprising a housing. The housing is characterized in that it is a handheld housing, and the housing includes a control processing unit and a cooling unit and a detection unit electrically connected thereto. One side of the housing is a detection surface, and the cooling unit passes through the detection surface and contacts the outer wall of the sealing cavity. The detection unit acquires the temperature and diffuse reflection signal data of the outer wall of the cavity and sends them to the control processing unit. The control processing unit obtains the water vapor content of the outer wall of the cavity based on the data of the outer wall of the cavity.

[0006] The cooling unit includes a semiconductor refrigeration chip. The cooling end of the semiconductor refrigeration chip is provided with a heat transfer block. A portion of the heat transfer block extends out of the detection surface and contacts the outer wall of the sealed cavity. The other side of the semiconductor refrigeration chip is connected to a heat sink and a cooling fan. The cooling fan is fixed on the housing.

[0007] The housing corresponding to the heat sink has heat dissipation holes.

[0008] The heat transfer block is an aluminum block or a copper block.

[0009] The detection unit includes a temperature sensor, which is installed on the heat transfer block to obtain the temperature of the heat transfer block and transmit the temperature data to the control processing unit.

[0010] The detection unit also includes a diffuse reflection laser sensor, which is fixed on the inner wall of the housing and set at an angle of 20 to 45 degrees to the housing. Its transmitting and receiving interfaces extend out of the heat transfer block and are aligned with the detection area. The diffuse reflection laser sensor acquires the diffuse reflection laser signal and transmits it to the control and processing unit.

[0011] The control processing unit is an MCU control board, which is electrically connected to the power supply and the display screen located on the outside of the housing.

[0012] The control and processing unit has built-in data on the correspondence between ambient temperature, relative humidity and dew point temperature. Based on the temperature data obtained by the detection unit at the moment of diffuse reflection signal, it calculates the absolute humidity inside the cavity and displays the value on the display screen.

[0013] This utility model has the following beneficial effects and advantages:

[0014] 1. The structure of this utility model allows operators to complete the test with one hand without relying on fixed equipment or complicated installation procedures; the test process does not require damaging the integrity of the sealed cavity, and the test can be started simply by contacting the heat transfer block of the refrigeration unit with the outer wall of the sealed cavity, avoiding the damage to the cavity's sealing caused by traditional invasive testing, and also eliminating the need to stop work to disassemble the cavity, making it particularly suitable for online testing of sealed cavities in industrial equipment.

[0015] 2. The semiconductor cooling chip has high cooling efficiency and can quickly reduce the temperature of the heat transfer block to the target value, ensuring that the outer wall of the sealed cavity can accurately reach the condensation condition; the heat sink and cooling fan work together, and with the corresponding heat dissipation holes in the shell, the heat generated by the semiconductor cooling chip can be discharged in time, avoiding the internal temperature of the shell from being too high and affecting the cooling effect, effectively avoiding detection errors caused by cooling fluctuations, and improving the reliability of water vapor content detection results.

[0016] 3. This utility model can acquire the temperature data of the heat transfer block, i.e. the contact point of the outer wall of the cavity, in real time, and accurately capture the temperature at the moment of condensation. The diffuse reflection laser sensor is set at an angle of 20-45 degrees, and its transmitting and receiving interfaces extend out of the heat transfer block and are aligned with the detection area. It can sensitively identify the changes in diffuse reflection signals before and after condensation on the outer wall of the cavity. The control and processing unit combines the temperature data at this time with the built-in relationship between ambient temperature and humidity and dew point temperature to quickly determine the absolute humidity inside the sealed cavity. Attached Figure Description

[0017] Figure 1 This is an exploded view of the structure of the sealed cavity water vapor content detection device based on surface condensation detection according to this utility model.

[0018] Figure 2 This is a schematic diagram illustrating the operating principle of this utility model;

[0019] Figure 3 This is a table of ambient temperature, relative humidity, and dew point.

[0020] The components are as follows: 1. Housing; 2. Semiconductor cooling chip; 3. Heat transfer block; 4. Cooling fan; 5. Diffuse reflection laser sensor; 6. Temperature sensor; 7. Control processing unit; 8. Display screen; 9. Power supply; 10. Outer wall of sealed cavity; 11. Condensation droplets; 12. Heat sink; 13. Detection surface; 14. Heat dissipation hole. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. Figure 1 As shown, this utility model is a water vapor content detection device for a sealed cavity based on surface condensation detection. It includes a handheld housing 1. The housing 1 includes a control processing unit and a cooling unit and a detection unit electrically connected to it. One side of the housing 1 is a detection surface 13. The cooling unit passes through the detection surface 13 and contacts the outer wall 10 of the sealed cavity. The detection unit acquires the temperature and diffuse reflection signal data of the outer wall of the cavity and sends them to the control processing unit. The control processing unit obtains the water vapor content of the outer wall of the cavity based on the data.

[0022] Furthermore, the cooling unit includes a semiconductor cooling chip 2. The cooling end of the semiconductor cooling chip 2 is provided with a heat transfer block 3 of aluminum or copper. A portion of the heat transfer block 3 extends out of the detection surface 13 and contacts the outer wall 10 of the sealed cavity. The other side of the semiconductor cooling chip 2 is connected to a heat sink 12 and a cooling fan 4. The cooling fan 4 is fixed on the housing 1. A heat dissipation hole 14 is provided at the position of the housing 1 corresponding to the heat sink 12.

[0023] Furthermore, the detection unit includes a temperature sensor 6 and a diffuse reflection laser sensor 5. The temperature sensor 6 is set on the heat transfer block 3 to obtain the temperature of the heat transfer block 3 and transmits the temperature data to the control processing unit 7. The diffuse reflection laser sensor is fixed on the inner wall of the housing and is set at an angle of 20 to 45 degrees with the housing. Its transmitting and receiving interfaces extend out of the heat transfer block 3 and are aligned with the detection area. Since this scheme determines the internal humidity value by whether there are water droplets inside the cavity during the cooling process, if there are water droplets, the diffuse reflection laser will be returned. If the diffuse reflection laser sensor 5 is not tilted, the value will be misled by the laser reflected by the glass. The diffuse reflection laser sensor 5 obtains the diffuse reflection laser signal and transmits it to the control processing unit 7.

[0024] Furthermore, the control processing unit 7 is an MCU control board, and the control processing unit 7 is electrically connected to the power supply 9 and the display screen 8 located on the outside of the housing.

[0025] The control processing unit 7 acquires the temperature data from the temperature sensor 6 and the diffuse reflection signal from the diffuse reflection laser sensor 5 in real time; the control processing unit has built-in dew point comparison data, and calculates the absolute humidity inside the cavity based on the temperature data at the time the diffuse reflection signal is acquired, and displays the value on the display screen 8.

[0026] When using this invention to detect the water vapor content in a sealed cavity, such as Figure 1 As shown, the sealed cavity is made of glass. The device is placed tightly against the outer wall of the sealed cavity. Upon activation, the control processing unit 7 first obtains the initial ambient temperature via the temperature sensor 6. Then, it starts the cooling fan 4 and the thermoelectric cooler 2. Once the thermoelectric cooler 2 starts working, its surface cools rapidly. This cooling temperature is then transferred to the outer wall 10 of the sealed cavity via the heat transfer block 3, directly contacting the outer wall. While one side of the thermoelectric cooler 2 is cooling, energy is conserved, and the other side becomes extremely hot. The other side of the thermoelectric cooler is cooled by heat sinks, ventilation holes, and the fan, preventing the cooling surface from being affected. As the wall temperature decreases, if the cavity contains water vapor, condensation will occur on the inner side of the cold wall, forming water droplets. The laser beam emitted by the diffuse reflection laser sensor 5 illuminates this area at a certain angle. The water droplets caused by the condensation will diffusely reflect the laser light. The reflected light is received by the sensor, triggering a signal control processing unit 7 to continuously monitor the readings of the temperature sensor 6 and the signal from the diffuse reflection laser sensor 5. Once the diffuse reflection laser sensor 5 is triggered, indicating that condensation droplets 11 have formed on the inner wall, the control processing unit 7 immediately records the current temperature value, which is the dew point temperature, and stops cooling. The control processing unit 7 retrieves the internally stored data on the correspondence between ambient temperature, relative humidity, and dew point temperature. Figure 3 ), combining the initial temperature (i.e., ambient temperature) and the measured dew point temperature, and comparing Figure 3 The absolute humidity inside the cavity, i.e. the water vapor content inside the cavity, is obtained and displayed on display screen 8. Subsequently, manual judgment is made to determine whether there is excessive humidity or poor sealing.

Claims

1. A sealed cavity water vapor content detection device based on surface condensation detection, comprising a housing, characterized in that, The housing is a handheld housing, containing a control processing unit and an electrically connected cooling and detection unit. One side of the housing is a detection surface, through which the cooling unit contacts the outer wall of the sealed cavity. The detection unit includes a temperature sensor mounted on a heat transfer block to acquire its temperature and transmit the data to the control processing unit. The detection unit also includes a diffuse reflection laser sensor, fixed to the inner wall of the housing at a 20-45 degree angle. Its transmitting and receiving interfaces extend from the heat transfer block and are aligned with the detection area. The diffuse reflection laser sensor acquires diffuse reflection laser signals and transmits them to the control processing unit. The control processing unit contains data on the relationship between ambient temperature, relative humidity, and dew point temperature. Based on the temperature data obtained by the detection unit at the moment of acquiring the diffuse reflection signal, it calculates the absolute humidity inside the cavity and displays the value on a screen.

2. The device for detecting water vapor content in a sealed cavity based on surface condensation detection according to claim 1, characterized in that: The cooling unit includes a semiconductor refrigeration chip. The cooling end of the semiconductor refrigeration chip is provided with a heat transfer block. A portion of the heat transfer block extends out of the detection surface and contacts the outer wall of the sealed cavity. The other side of the semiconductor refrigeration chip is connected to a heat sink and a cooling fan. The cooling fan is fixed on the housing.

3. The device for detecting water vapor content in a sealed cavity based on surface condensation detection according to claim 2, characterized in that: The housing corresponding to the heat sink has heat dissipation holes.

4. The device for detecting water vapor content in a sealed cavity based on surface condensation detection according to claim 2, characterized in that: The heat transfer block is an aluminum block or a copper block.

5. The device for detecting water vapor content in a sealed cavity based on surface condensation detection according to claim 1, characterized in that: The control processing unit is an MCU control board, which is electrically connected to the power supply and the display screen located on the outside of the housing.

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