A temperature and humidity reed switch sensor assembly

Abstract

This utility model discloses a temperature and humidity reed switch sensor assembly, comprising: a tube body, a base electrode, a humidity electrode, a temperature electrode, an electrode head, a temperature sensing sheet, a film, and a shielding coating. The tube body is a sealed hollow structure with through holes. The base electrode and the electrode head constitute the signal input terminal, and the humidity electrode and the temperature electrode constitute the output sensing terminal. The temperature sensing sheet has temperature-response deformation capability to sense temperature changes. The film is made of a hygroscopic polymer material, which can expand in volume when humidity changes to change the capacitance distance. The shielding coating is used to reduce capacitive coupling interference. This utility model achieves independent temperature and humidity sensing through a dual-channel structure, with fast response, compact structure, and strong anti-interference capability, and is suitable for various precision temperature and humidity monitoring applications.

Description

Technical Field

[0001] This utility model relates to the field of reed switch sensor technology, specifically a temperature and humidity dry reed switch sensor assembly. Background Technology

[0002] Precise monitoring of environmental parameters has wide applications in smart homes, consumer electronics, and industrial control, especially in the joint detection of temperature and humidity. Traditional sensors often use separate configurations of thermistors and capacitive humidity sensors, achieving dual-parameter monitoring through integrated circuit processing. However, this type of split structure generally suffers from problems such as large size, slow response, complex structure, and susceptibility to interference, making it difficult to meet the modern sensing requirements of miniaturization, low power consumption, and high sensitivity.

[0003] In existing technologies, reed switches are widely used in position detection, Hall effect switches, and magnetic triggering, but their application in environmental monitoring, especially in dual-parameter temperature and humidity sensing, still faces many limitations. In existing temperature and humidity composite sensor structures, thermistor materials and humidity-sensitive capacitors are separately deployed on a substrate. The capacitance changes between their electrodes are easily affected by nearby conductors and electromagnetic interference, resulting in severe parasitic capacitive coupling between the temperature and humidity channels. Interference signals are unavoidable and seriously affect the stability of the sensor.

[0004] In addition, some structures attempt to achieve temperature response by setting up a temperature-sensitive deformation mechanism, such as using a bimetallic strip to warp and guide electrode displacement. However, these methods generally suffer from problems such as limited response curvature and sluggish response of the contact electrode. Furthermore, they fail to effectively integrate the mutual shielding control between the humidity-sensitive structure and the temperature-sensitive structure, which can easily lead to cross-errors.

[0005] Furthermore, most current mainstream humidity-sensitive materials are polymer thin films and oxide ceramics. Although they possess certain hygroscopic properties, their volume expansion capacity is insufficient, making it difficult to generate a sufficient mechanical response to trigger or regulate structural capacitance. In addition, due to limited structural space, traditional sensing structures cannot effectively integrate miniaturized, fast-response, and interference-resistant composite detection elements.

[0006] Therefore, existing temperature and humidity sensors still have shortcomings in terms of structural integration, response accuracy, anti-interference ability, and manufacturing adaptability. There is an urgent need for a new type of temperature and humidity reed switch sensor assembly that is compact, fast-responding, and has an optimized capacitive shielding structure to solve the above-mentioned technical problems. Utility Model Content

[0007] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, the technical solution adopted by this utility model is as follows: a temperature and humidity reed switch sensor assembly, including a tube body, a base, an electrode head, a humidity electrode, a temperature electrode, a temperature sensing sheet, a film, and a shielding coating. Temperature and humidity are respectively triggered by independent mechanical response structures that induce capacitance changes, which are then output to the processing circuit via electrodes for signal recognition, thereby achieving accurate detection of ambient temperature and humidity.

[0009] In a preferred example, the tube is a sealed hollow structure for housing the temperature and humidity response component, and its outer wall has at least a pair of symmetrically arranged through-holes on both sides of the tube. This through-hole structure guides moisture or heat from the outside air into the tube, enabling the response element to quickly sense environmental changes. Specifically, this structure helps to achieve heat and humidity conduction in a short time, improving the sensor's response speed and environmental adaptability.

[0010] In a preferred example, the base is located at one end of the tube and extends to the outside of the tube to form a common electrical reference terminal; the humidity electrode and temperature electrode are both located at the opposite ends of the tube, serving as the sensing output terminals of the humidity response channel and temperature response channel, respectively. The electrode head is located inside the base and extends into the inner side of the tube, forming one electrode of the first capacitor structure for humidity detection. Specifically, this structure forms two independent capacitive sensing paths, used for humidity and temperature detection respectively, ensuring that the dual-channel signals do not interfere with each other.

[0011] In a preferred example, the temperature-sensing element is an elastic structure with temperature-responsive deformation characteristics, disposed between the heating electrode and the base electrode, with its two ends electrically connected to the base electrode and the electrode tip, respectively. The temperature-sensing element can be made of bimetallic or shape memory alloy material, and its surface has a preset initial curvature. When the temperature rises, it warps or bends, causing a change in its relative position with the heating electrode, thus forming a stable capacitance change path. Specifically, this structure allows temperature changes to be converted into capacitance change signals, possessing the advantages of high sensitivity and repeatability.

[0012] In a preferred example, the film, disposed between the electrode head and the wet electrode, is made of a hygroscopic polymer material, such as a polyacrylic acid hydrogel sheet. It expands significantly when ambient humidity increases, and by pushing the electrode head, it changes the distance between itself and the wet electrode, thus realizing the conversion of humidity change into capacitance change. Specifically, this structure can achieve passive response without increasing energy consumption, making it particularly suitable for low-power applications.

[0013] In a preferred example, to prevent parasitic coupling interference between the temperature and humidity channels, a shielding coating is applied to the area opposite the humidity electrode and the temperature sensing plate, as well as the area opposite the temperature electrode and the electrode head. This coating, which may be composed of conductive silver paste or carbon nanotube coating, does not directly conduct with the electrodes; it exists solely as a field shielding layer, weakening or isolating interfering capacitive signals. Specifically, this shielding design significantly improves the sensor's selectivity to target environmental parameters and enhances signal decoupling accuracy.

[0014] In a preferred embodiment, the tube body can be a cylindrical structure made of glass, which has excellent airtightness and processing stability; the through-hole is located in the middle section of the tube body, which facilitates uniform gas permeation on both sides and avoids local lag. Specifically, this structure simultaneously ensures the physical protection of the response element and the sensitivity of environmental airflow exchange.

[0015] In a preferred embodiment, the two ends of the temperature sensing element are fixedly connected to the base and electrode head by spot welding, hot pressing, or laser welding, enhancing the integrated mechanical stability of the component. The wet electrode and the warm electrode are preferably elastic metal springs made of nickel-copper alloy, possessing good conductivity and environmental adaptability, suitable for long-term continuous operation.

[0016] Through the above-mentioned structural optimization design, this utility model can achieve independent and sensitive perception of ambient temperature and humidity. It has a compact structure, low cost, fast response, and good anti-interference ability. It is suitable for industrial sensing, electrical switches, smart terminals and other fields with high requirements for size, power consumption and stability.

[0017] The beneficial effects achieved by this utility model are as follows: 1. In this utility model, a temperature response structure and a humidity response structure are provided inside the tube. They form independent capacitance change paths through a temperature sensing sheet and a moisture-absorbing film, respectively. This enables simultaneous dual-channel capacitive detection of ambient temperature and humidity. It features fast response speed, high accuracy, and compact structure, making it suitable for environmental sensing applications in small electronic devices.

[0018] 2. In this invention, the film is made of a hygroscopic polymer material (such as PAA-type hydrogel), which has good humidity response expansion characteristics. Combined with the capacitance control method between the electrode head and the wet electrode, it can realize rapid and sensitive humidity change detection. At the same time, the temperature sensing sheet is a shape memory alloy or bimetallic structure with controllable curvature response. It senses temperature by changing the distance between itself and the temperature electrode. The structure is stable and has good repeatability.

[0019] 3. This utility model further improves signal independence by setting a shielding coating in key parts, effectively isolating parasitic capacitance interference between the temperature and humidity sensing structures, significantly enhancing the accuracy and anti-interference capability of temperature and humidity detection. The overall structural design is scientific and reasonable, the manufacturing process is mature, and it is suitable for mass production. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of one embodiment of the present invention.

[0021] Figure label: 10. Pipe body; 11. Through hole; 20. Base electrode; 21. Electrode tip; 30. Wet electrode; 40. Warm electrode; 50. Film; 60. Temperature sensing film; 70. Shielding coating. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0023] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0024] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a temperature and humidity reed switch sensor assembly.

[0025] Combination Figures 1-2 As shown, the present invention provides a temperature and humidity reed switch sensor assembly, comprising: a tube body 10, a base electrode 20, an electrode head 21, a wet electrode 30, a warm electrode 40, a temperature sensing sheet 60, a film 50, and a shielding coating 70.

[0026] The tube body 10 is a closed hollow structure, preferably a cylindrical structure made of glass. Its outer wall is provided with at least a pair of through holes 11 symmetrically arranged on both sides for introducing gas from the external environment into the tube body 10. The through holes 11 are preferably located on the middle section side wall of the tube body 10 to enhance the conduction efficiency of moisture and heat.

[0027] The base electrode 20 is disposed at one end of the tube body 10 and led out to the outside of the tube body 10 for connection to the base voltage. The electrode head 21 is fixedly disposed at the end of the base electrode 20 and extends inward to the inside of the tube body 10, forming a first capacitor structure with the wet electrode 30 spaced apart. The electrode head 21 and the wet electrode 30 maintain a predetermined distance to form a first capacitor detection structure for sensing humidity changes. The wet electrode 30 is disposed at the end of the tube body 10 away from the base electrode 20 and is encapsulated and connected to the tube body 10. The wet electrode 30 adopts an elastic metal spring structure, preferably made of nickel-copper alloy material, to ensure excellent conductivity and resilience.

[0028] The temperature electrode 40 is also located at the end of the tube 10 away from the base electrode 20, and is arranged in parallel with the wet electrode 30 to form another independent temperature response structure. The temperature electrode 40 is preferably a metal spring structure made of nickel-copper alloy.

[0029] The temperature-sensing element 60 is disposed between the heating electrode 40 and the base electrode 20. It is an elastic structure with temperature-responsive deformation characteristics, and its two ends are electrically connected to the base electrode 20 and the end of the electrode head 21, respectively. The temperature-sensing element 60 is preferably made of a bimetallic structure or a shape memory alloy. Its surface has an initial arc curvature. When the ambient temperature rises, it will warp and deform to one side due to the difference in thermal expansion coefficients, thereby changing the relative distance between it and the heating electrode 40, so that the capacitance value between the structures changes with temperature.

[0030] The film 50, attached between the electrode head 21 and the wet electrode 30, is a flexible sheet made of a hygroscopic polymer material, preferably a polyacrylic acid (PAA) hydrogel sheet, which has the function of expanding in volume after absorbing moisture. When the humidity increases, the film 50 will expand in volume due to moisture absorption, and push the electrode head 21 to make a slight displacement relative to the wet electrode 30, thereby changing the distance between them and causing the capacitance value between them to change with the ambient humidity.

[0031] To prevent parasitic capacitive coupling interference between the temperature and humidity detection channels, shielding coatings 70 are respectively provided at the areas opposite to the humidity electrode 30 and the temperature sensing film 60, and at the areas opposite to the temperature electrode 40 and the electrode head 21. These shielding coatings 70 are preferably made of conductive silver paste or carbon nanotube coating and are electrically isolated from the electrode leads. Their function is to shield against changes in the electric field or interference sources outside the capacitance detection path, ensuring good accuracy and independence in the response process of the temperature sensing film 60 and the film 50.

[0032] In practical applications, when the ambient temperature rises, the temperature sensing element 60 undergoes thermal deformation, changing the distance between it and the temperature electrode 40, thus altering the capacitance between the base electrode 20 and the temperature electrode 40. When the ambient humidity rises, moisture enters the tube body 10 through the through-hole 11, causing the film 50 to absorb moisture and expand, pushing the electrode head 21 to change the distance between it and the wet electrode 30, thereby changing the capacitance between the base electrode 20 and the wet electrode 30. These two capacitance change channels correspond to temperature and humidity changes respectively, and are output to the subsequent capacitance detection or decoding circuit, thereby achieving dual-channel synchronous detection of ambient temperature and humidity.

[0033] In the above specific embodiments, this utility model significantly improves the response sensitivity and anti-interference ability of temperature and humidity detection through a design with distinct structural layers and independent detection channels, while effectively controlling the structural volume and manufacturing cost, and has good prospects for industrial application.

[0034] Working principle and usage process of this utility model: This utility model provides a temperature and humidity reed switch sensor assembly, which integrates a dual-capacitive detection structure for temperature and humidity inside a sealed hollow tube 10. It combines the humidity response expansion characteristics of polymer materials and the thermal response deformation characteristics of bimetallic / shape memory materials to achieve synchronous capacitive detection of ambient temperature and humidity.

[0035] In use, the base 20 serves as the capacitor reference terminal and is connected to an external signal circuit. The humidity electrode 30 and temperature electrode 40 serve as output measurement terminals, used to sense changes in humidity and temperature, respectively. When the ambient temperature rises, heat is transferred into the tube body through the through-hole 11 on the surface of the tube body 10. The temperature sensing element 60 changes its curvature or deforms due to the temperature rise, causing a change in the distance between it and the temperature electrode 40, resulting in a change in the capacitance value between them. At the same time, the conductive path formed by the temperature sensing element 60 and the base 20 also causes the potential distribution to adjust due to deformation, further responding to temperature changes.

[0036] Under varying humidity conditions, external moisture enters the tube 10 through the perforation 11 and adheres to the surface of the film 50 positioned between the electrode head 21 and the wet electrode 30. The film 50 is made of a polymer material with high hygroscopicity and high expansion response, such as PAA hydrogel. After absorbing moisture, it expands significantly, thereby pushing the electrode head 21 and increasing or decreasing the distance between it and the wet electrode 30, thus changing the capacitance value of the first capacitor structure.

[0037] To avoid cross-interference between temperature and humidity affecting sensing accuracy, a shielding coating 70 is provided between the humidity electrode 30 and the temperature sensing plate 60, and between the temperature electrode 40 and the electrode head 21. This coating is made of conductive silver paste or carbon-based coating and has no direct conduction with the electrodes. It only serves as a parasitic capacitance isolation layer to prevent parasitic capacitance coupling in non-target electric field areas, thus ensuring independent and accurate sensing of temperature and humidity signals.

[0038] Therefore, by monitoring the capacitance change between the temperature electrode 40 and the base electrode 20 and the capacitance change between the wet electrode 30 and the electrode head 21 respectively, users can achieve independent identification and quantitative detection of ambient temperature and humidity, which is widely applicable to space-constrained and miniaturized sensor integration applications.

[0039] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A temperature and humidity reed switch sensor assembly, characterized in that, include: The tube body (10) is a closed hollow structure, and the outer wall is provided with at least a pair of through holes (11) arranged opposite to each other on both sides of the tube body (10) for conducting ambient gas to the interior. The base electrode (20), the wet electrode (30), and the warm electrode (40) are provided. The base electrode (20) is disposed at one end of the tube body (10) and led out to the outside. The wet electrode (30) and the warm electrode (40) are both encapsulated and connected to the other end of the tube body (10). The electrode head (21) is disposed at the end of the base electrode (20) and extends into the tube body (10), and is spaced apart from the wet electrode (30) to form a first capacitor structure; The temperature sensing sheet (60) is an elastic structure with temperature-responsive deformation characteristics. It is disposed between the temperature electrode (40) and the base electrode (20), and its two ends are electrically connected to the base electrode (20) and the end of the electrode head (21) respectively. It undergoes curvature changes due to temperature. The film (50) is a flexible sheet made of hygroscopic polymer material, which is attached between the electrode head (21) and the wet electrode (30). After absorbing moisture, it expands in volume to change the distance between the electrode head (21) and the wet electrode (30). A shielding coating (70) is respectively disposed in the area opposite to the wet electrode (30) and the temperature sensing plate (60), and in the area opposite to the temperature electrode (40) and the electrode head (21), to suppress parasitic capacitance changes caused by interference from non-target media.

2. The temperature and humidity dry-spring sensor assembly of claim 1, wherein: The tube body (10) is a cylindrical tube made of glass. The through hole (11) is located in the middle section of the side wall of the tube body (10) and is used to guide external moisture into the tube body to act on the film (50) and the temperature sensing plate (60).

3. The temperature and humidity dry-spring sensor assembly of claim 1, wherein: The temperature sensing element (60) has a bimetallic or shape memory alloy structure and its surface has an arc curvature. When the temperature rises, it warps and deforms to change the distance between itself and the temperature electrode (40).

4. The temperature and humidity dry-spring sensor assembly of claim 1, wherein: The film (50) is a hygroscopic sheet that can expand significantly when the humidity increases to push the electrode head (21) and change the capacitance value between it and the wet electrode (30).

5. The temperature and humidity dry-spring sensor assembly of claim 1, wherein: The shielding coating (70) is a conductive coating structure that is not connected to the electrodes. It is used to suppress capacitive interference and is only used to shield the potential changes of capacitive field interference.

6. The temperature and humidity dry-spring sensor assembly of claim 1, wherein: The two ends of the temperature sensing plate (60) are fixedly connected to the electrode head (21) and the base electrode (20); the wet electrode (30) and the warm electrode (40) are elastic metal spring structures.

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