Weather-resistant humidity-sensitive element packaging structure based on polymer breathable film

Abstract

The weather-resistant humidity-sensitive element packaging structure comprises a humidity-sensitive assembly and a PCB (Printed Circuit Board), and further comprises a supporting shell and the macromolecule breathable film, the supporting shell is arranged on the PCB, the humidity-sensitive assembly is arranged in the supporting shell, a pin of the humidity-sensitive assembly extends out of the supporting shell and is fixedly connected with the PCB, and the macromolecule breathable film is arranged on the supporting shell. A plurality of air holes are formed in the supporting shell, the supporting shell is wrapped with the macromolecule air-permeable membrane, the macromolecule air-permeable membrane is fixed to the PCB, the PCB is wrapped with the supporting shell, the pins of the humidity-sensitive assembly penetrate through the macromolecule air-permeable membrane, and a micropore structure is arranged on the macromolecule air-permeable membrane. According to the utility model, the interaction between the humidity sensitive element and the external environment can be maintained, the response speed of the humidity sensitive element is maintained, and the cost is lower.

Description

Technical Field

[0001] This utility model relates to a weather-resistant humidity-sensitive element packaging structure based on a polymer breathable membrane, belonging to the field of humidity measurement elements. Background Technology

[0002] Humidity measurement has always been an important research area. Humidity is measured using humidity-sensitive elements. To protect these elements, they need to be encapsulated. Currently, common humidity-sensitive element encapsulation methods mainly include the following two types:

[0003] One approach is to use a metal or plastic casing for sealing to protect the humidity-sensitive element from the influence of the external environment. This packaging method can ensure the stability of the humidity-sensitive element to a certain extent, but due to the limitations of the sealing structure, the interaction between the humidity-sensitive element and the external environment is hindered, resulting in a slower response speed.

[0004] Secondly, there is microporous ceramic encapsulation, which utilizes the air permeability of microporous ceramic materials to enable the interaction between the humidity-sensitive element and the external environment. Microporous ceramics have a certain degree of air permeability and stability, but the manufacturing process is complex and the cost is high. Summary of the Invention

[0005] The purpose of this invention is to provide a weather-resistant humidity sensor encapsulation structure based on a polymer breathable membrane, which not only maintains the interaction between the humidity sensor and the external environment and preserves the response speed of the humidity sensor, but also has a low cost.

[0006] To solve the above problems, the technical solution adopted by this utility model is: a weather-resistant humidity-sensitive element packaging structure based on a polymer breathable membrane, including a humidity-sensitive component and a PCB board, as well as a support shell and a polymer breathable membrane. The support shell is disposed on the PCB board, the humidity-sensitive component is disposed inside the support shell, the pins of the humidity-sensitive component extend out of the support shell and are fixedly connected to the PCB board, the support shell is provided with a number of vent holes, the polymer breathable membrane covers the support shell, the polymer breathable membrane is fixed to the PCB board, and the support shell is wrapped on the PCB board, wherein the pins of the humidity-sensitive component pass through the polymer breathable membrane, and the polymer breathable membrane is provided with a microporous structure.

[0007] This invention uses a high-molecular breathable membrane to cover the support shell and PCB board. Due to the microporous structure on the high-molecular breathable membrane, water molecules can pass through it into the support shell, maintaining the interaction between the humidity-sensitive element and the external environment while preventing liquid water and dust from entering the support shell. Simultaneously, the support shell reduces the impact of ultraviolet radiation on the humidity-sensitive component, improving its weather resistance under different climatic conditions and enabling stable operation in complex environments. This avoids performance degradation or damage caused by temperature and humidity changes, ultraviolet radiation, dust, etc. Compared to existing technologies, this invention ensures the humidity-sensitive element can accurately sense changes in ambient humidity while preventing excessive moisture intrusion and damage, thus extending its service life. Furthermore, the high-molecular breathable membrane used in this invention has a lower cost compared to existing technologies using microporous ceramic materials, reducing the overall cost.

[0008] As a further improvement of this utility model, the support shell includes a housing and a sealing plate. One end of the sealing plate is connected to one end of the housing opening and can be flipped relative to the housing. The sealing plate is used to encapsulate the humidity-sensitive component inside the housing, and the sealing plate is in contact with the PCB board. A notch is provided at the other end of the housing opening for the pins of the humidity-sensitive component to pass through. The shell-support structure of this utility model, by flipping the sealing plate, opens the housing structure, facilitating the installation of the humidity-sensitive component inside the support shell. At the same time, the notch in the housing facilitates the extension of the pins of the humidity-sensitive component, thus simplifying the assembly of this utility model.

[0009] As a further improvement of this invention, the vent is located on one side of the housing, parallel to the PCB board. This placement of the vent facilitates the entry of water vapor molecules into the supporting housing, thereby improving the accuracy of humidity measurement.

[0010] As a further improvement of this utility model, several ventilation grooves are provided on both sides of the sealing plate, and these ventilation grooves communicate with the shell. The ventilation grooves on both sides of the sealing plate improve the air permeability of this utility model, further enhancing the accuracy of its measurements.

[0011] As a further improvement of this utility model, sealant is provided on the outer surface of the polymer breathable membrane where it is in contact with the surface of the shell with the notch, on the outer surface of the membrane where it is in contact with the side of the shell used to connect the sealing plate, and on the outer surface of the membrane where it is in contact with the PCB board. This utility model uses sealant to seal the joints of the polymer breathable membrane, which can effectively prevent liquid water and dust from entering the support shell through the joints of the polymer breathable membrane during use.

[0012] As a further improvement of this invention, the polymer breathable membrane is made of expanded polytetrafluoroethylene (ePTFE). This invention utilizes the excellent corrosion resistance of ePTFE, which exhibits strong resistance to the vast majority of chemical substances. Whether it is strong acid, strong alkali, organic solvent, or other corrosive media, ePTFE maintains stable performance and will not be corroded or degraded, thus improving the service life of this invention.

[0013] As a further improvement of this utility model, the thickness of the polymer breathable membrane is 0.18mm, the air permeability is greater than 2000mL / cm2 / min@7kPa, and the water pressure resistance is greater than 20kPa / 60s.

[0014] As a further improvement of this invention, the support shell is made of polytetrafluoroethylene (PTFE), and indentations are provided at the connection between the shell and the sealing plate for the sealing plate to flip relative to the shell. This invention utilizes the excellent weather resistance and corrosion resistance of PTFE to improve the service life of the entire support shell, while providing support for the polymer breathable membrane.

[0015] In summary, the beneficial effects of this invention are as follows: This invention significantly improves the weather resistance of humidity-sensitive elements, enabling them to operate stably under various harsh climatic conditions, such as high temperature, high humidity, low temperature, and strong ultraviolet radiation; this invention achieves a good balance between breathability and waterproofness, ensuring that the humidity-sensitive element can accurately sense changes in ambient humidity while effectively preventing excessive moisture intrusion and damage to the element; this invention enhances the reliability and durability of the humidity-sensitive element's packaging, extends the lifespan of the humidity-sensitive element, and reduces maintenance costs; the packaging method of this invention is suitable for various types of humidity-sensitive elements, has broad application prospects, and can be applied to meteorological monitoring and industrial automation. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention (excluding the polymer breathable membrane).

[0017] Figure 2 This is a three-dimensional exploded view of the present invention.

[0018] The components are: 1. Humidity-sensitive component; 2. PCB board; 3. Support shell; 4. Polymer breathable membrane; 5. Pins; 6. Ventilation holes; 7. Housing; 8. Sealing plate; 9. Notch; 10. Ventilation groove. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 and Figure 2The illustrated weather-resistant humidity-sensitive element packaging structure based on a polymer breathable membrane includes a humidity-sensitive component 1 and a PCB board 2, both of which are existing technologies. This invention includes a support shell 3 and a polymer breathable membrane 4. The support shell 3 is mounted on the PCB board 2 and is attached to the PCB panel 2. The humidity-sensitive component 1 is housed within the support shell 3, with two leads 5 extending out of the support shell 3 and soldered to the PCB board 2. The support shell 3 has several ventilation holes 6. The polymer breathable membrane 4 covers the support shell 3 and is fixed to the PCB board 2, encasing the support shell 3 within the PCB board 2. The leads 5 of the humidity-sensitive component 1 pass through the polymer breathable membrane 4, sealing the humidity-sensitive element 1 within a specific cavity formed by the support shell 3. The surface of the support shell 3 is covered by the polymer breathable membrane 4, ensuring that the humidity-sensitive element 1 can exchange humidity with the external environment while protecting the element from other adverse factors.

[0021] like Figure 1 and Figure 2 As shown, the support shell 3 of this invention includes a shell 7 and a sealing plate 8. One end of the sealing plate 8 is connected to one end of the shell 7 with an opening and can be flipped relative to the shell 7. The sealing plate 8 is used to encapsulate the humidity-sensitive component 1 inside the shell 7, and the sealing plate 8 is in contact with the PCB board 2. Two notches 9 are provided at the other end of the shell 7 with an opening for the pins 5 of the humidity-sensitive component 1 to pass through. In this invention, the notch 9 is open at the end closer to the PCB board 2, and the width of the open end is greater than the width of the other end, making the notch 9 an isosceles trapezoid shape. The vent 6 in this invention is provided on one side of the shell 7 parallel to the PCB board 2, that is, on the side of the shell 7 away from the PCB board 2. The center line of the vent 6 is perpendicular to the PCB board 2.

[0022] To enhance air permeability, this invention provides several air permeable grooves 10 on both sides of the sealing plate 8, such as... Figure 1 and Figure 2 As shown, the ventilation groove 10 is connected to the housing 7. The ventilation groove 10 is projected onto the PCB board 2 in the shape of an isosceles trapezoid. The opening end is located at the edge of the sealing plate 8, and the width of the opening end is greater than the width of the other end.

[0023] In this invention, the seam of the polymer breathable membrane 4 is located on the side of the PCB board 2 away from the supporting shell 3. Sealant is applied to the outer surface of the polymer breathable membrane 4 where it contacts the surface of the shell 7 with the notch 9, the outer surface of the polymer breathable membrane 4 where it contacts the side of the shell 7 used to connect the sealing plate 8, and the outer surface of the polymer breathable membrane 4 where it contacts the PCB board 2. The polymer breathable membrane 4 in this invention is made of expanded polytetrafluoroethylene (E-PTFE) and has a microporous structure. This microporous structure allows water vapor molecules to pass through while blocking liquid water and impurities such as dust. The thickness of the polymer breathable membrane 4 is 0.18 mm, and its air permeability is greater than 2000 mL / cm². 2 / min@7kPa, water pressure resistance greater than 20kPa / 60s. The expanded polytetrafluoroethylene material used in this invention has excellent corrosion resistance and strong resistance to most chemical substances. Whether it is strong acid, strong alkali, organic solvent or other corrosive media, expanded polytetrafluoroethylene (E-PTFE) can maintain stable performance and will not be corroded or degraded.

[0024] The support shell 3 in this invention is made of polytetrafluoroethylene (PTFE). The shell 7 and the sealing plate 8 are integrally molded. An indentation is provided at the connection between the shell 7 and the sealing plate 8 for the sealing plate 8 to flip relative to the shell 7 during use. Polytetrafluoroethylene (PTFE) has good weather resistance and corrosion resistance. The support shell 3 can completely enclose the humidity-sensitive chip of the humidity-sensitive component 1, avoiding physical damage such as wear and collision, providing mechanical protection for the humidity-sensitive chip, and also providing support for the polymer breathable membrane 4. The large area of ​​vent holes on one side of the support shell 3 ensures that moisture passes through the polymer membrane 4 and makes full contact with the moisture-sensing part of the humidity-sensitive chip, resulting in fast and accurate measurement.

[0025] The packaging method of this utility model is as follows: First, flip the sealing plate 8 to open the support shell 3, place the humidity-sensitive component 1 inside the shell 7, and make the two pins 5 of the humidity-sensitive component 1 protrude from the two notches 9 on the shell 7 respectively. Then, flip the sealing plate 8 to seal the humidity-sensitive component 1 inside the shell 7. Place the support shell 3 on the PCB board 2 so that the sealing plate 8 is in contact with the PCB board 2. Then, cover the support shell 3 and the PCB board 2 with a polymer breathable membrane 4, wherein only the end of the PCB board 2 that is in contact with the support shell 3 is covered by the polymer breathable membrane 4. Specifically, the polymer breathable membrane 4 is first covered on the surface of the housing 7 where the vent holes 6 are opened, and then its four sides are bent downward to cover the support housing 3 and the PCB panel 2 for the end that is in contact with the support housing 3. At this time, the polymer breathable membrane 4 is located on one side of the pin 5 of the humidity-sensitive component 1, and the side opposite to the pin 5 and the side of the PCB panel 2 away from the support housing 3 are the joint seams. Then, epoxy sealant is applied to the entire outer surface of the polymer breathable membrane 4 at the joint seam, and the epoxy sealant is allowed to cure completely in 24 hours.

[0026] This invention can meet the application needs of different environments. In outdoor application scenarios such as meteorological observation and agricultural monitoring, humidity-sensitive elements need to withstand various complex climatic conditions, such as direct sunlight, wind and rain, and temperature changes. This invention can ensure that the humidity-sensitive elements work stably and accurately measure humidity in these harsh environments. In industrial production sites, there are usually factors such as high temperature, high humidity, dust, and corrosive gases, which pose a severe challenge to the performance and lifespan of humidity-sensitive elements. This invention can protect humidity-sensitive elements from the effects of these adverse factors and improve their reliability in industrial environments.

[0027] This invention improves the performance of humidity sensors. The high-molecular breathable membrane has excellent air permeability, enabling the humidity sensor to respond quickly to changes in ambient humidity, thus improving the real-time performance and accuracy of measurements. This invention can effectively block external interference factors, such as dust and chemicals, ensuring that the humidity sensor is only sensitive to water vapor molecules, thereby improving measurement accuracy. By using weather-resistant materials and optimizing the packaging structure, this invention can enhance the stability of the humidity sensor and reduce performance fluctuations caused by environmental changes.

[0028] This invention can extend the service life of humidity-sensitive elements. It provides physical and chemical protection for humidity-sensitive elements, preventing them from being affected by mechanical damage, corrosion, and aging, thus extending their service life. Because the life of humidity-sensitive elements is extended, this invention reduces the need for frequent replacement and maintenance, thereby lowering the cost of use.

[0029] Unless otherwise specified in the above description, all parts are prior art or can be implemented using existing technology. Furthermore, the specific embodiments described in this utility model are merely preferred embodiments and are not intended to limit the scope of this utility model. That is, all equivalent changes and modifications made within the scope of this utility model patent should be considered within the technical scope of this utility model.

Claims

1. A weather-resistant humidity-sensitive element packaging structure based on a breathable polymer membrane, comprising a humidity-sensitive component and a PCB board, characterized in that: It also includes a support shell and a polymer breathable membrane. The support shell is set on the PCB board, and the humidity-sensitive component is set inside the support shell. The pins of the humidity-sensitive component extend out of the support shell and are fixedly connected to the PCB board. The support shell is provided with several breathable holes. The polymer breathable membrane covers the support shell and is fixed to the PCB board, thus wrapping the support shell on the PCB board. The pins of the humidity-sensitive component pass through the polymer breathable membrane, which is provided with a microporous structure.

2. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to claim 1, characterized in that: The support shell includes a housing and a sealing plate. One end of the sealing plate is connected to one end of the housing opening and can be flipped relative to the housing. The sealing plate is used to encapsulate the humidity-sensitive component inside the housing and is attached to the PCB board. A notch is provided at the other end of the housing opening for the pins of the humidity-sensitive component to pass through.

3. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to claim 2, characterized in that: The ventilation holes are located on one side of the housing, parallel to the PCB board.

4. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to claim 2, characterized in that: Several ventilation grooves are provided on both sides of the sealing plate, and these ventilation grooves are connected to the shell.

5. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to any one of claims 2 to 4, characterized in that: Sealant is applied to the outer surface of the polymer breathable membrane where it is in contact with the surface of the housing with the notch, the outer surface of the membrane where it is in contact with the side of the housing used to connect the sealing plate, and the outer surface of the membrane where it is in contact with the PCB board.

6. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to any one of claims 1 to 4, characterized in that: The polymer breathable membrane is made of expanded polytetrafluoroethylene.

7. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to claim 6, characterized in that: The polymer breathable membrane has a thickness of 0.18 mm and an air permeability greater than 2000 mL / cm². 2 / min@7kPa, water pressure resistance greater than 20kPa / 60s.

8. The weather-resistant humidity-sensitive element encapsulation structure based on a polymer breathable membrane according to any one of claims 2 to 4, characterized in that: The support shell is made of polytetrafluoroethylene and has indentations at the junction of the shell and the sealing plate for the sealing plate to flip relative to the shell.

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