Water quality sensing chip packaging structure for residual chlorine detection

Abstract

The utility model discloses a water quality sensing chip packaging structure for residual chlorine detection. The water quality sensing chip packaging structure comprises a shell base, a PCB (Printed Circuit Board) substrate, a detection chip and a signal interface, the detection chip is arranged on the PCB substrate, a sensitive electrode and a chip contact group are arranged on the detection chip, and the detection chip is a residual chlorine detection sensing chip; a reference electrode is arranged on the PCB substrate, and one end of the reference electrode is positioned above the sensitive electrode; the PCB substrate is provided with a substrate electrode, and the substrate electrode is electrically connected with the chip contact group; one end of the shell base is provided with a bearing cavity, and the PCB substrate is arranged in the bearing cavity; the signal interface is arranged in the shell base and is electrically connected with the reference electrode and the substrate electrode; the bearing cavity is filled with the sealing colloid, the PCB substrate is immersed in the sealing colloid, and only the sensitive electrode and the reference electrode are exposed, the technical scheme provided by the utility model can realize selective contact between the sensitive electrode and an external water body, and meanwhile, an internal circuit is protected from corrosion and water pressure impact.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor packaging technology, and more specifically, to a water quality sensor chip packaging structure for residual chlorine detection. Background Technology

[0002] Residual chlorine testing is a crucial step in ensuring water quality safety. By selecting appropriate testing methods and paying attention to relevant details, residual chlorine levels can be effectively monitored and controlled, improving the disinfection effect of water. With the development of technology, residual chlorine testing technology is also constantly being innovated and improved. The principle of residual chlorine testing is that residual chlorine refers to the chloride residue remaining after the chlorinating agent added during the water treatment process disinfects organic matter and microorganisms in the water. Residual chlorine testing is one of the important indicators for measuring the disinfection effect of water bodies and a key step in ensuring water quality safety.

[0003] Traditional sensor chip packaging is mostly metal or ceramic. Existing packaging solutions are complex to install and difficult to replace, and there are problems such as corrosion and water pressure impact on internal circuits.

[0004] Therefore, how to provide a water quality sensor chip packaging structure for residual chlorine detection that can overcome the above-mentioned technical problems, achieve selective contact between the sensitive electrode and the external water body, and protect the internal circuit from corrosion and water pressure impact has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a water quality sensor chip packaging structure for residual chlorine detection, which enables selective contact between the sensitive electrode and the external water body, while protecting the internal circuit from corrosion and water pressure impact.

[0006] The technical solution provided by this utility model is as follows:

[0007] This utility model provides a water quality sensor chip packaging structure for residual chlorine detection, including: a housing base, a PCB substrate, a detection chip, and a signal interface; the detection chip is disposed on the PCB substrate, and the detection chip is provided with a sensitive electrode and a chip contact group, the detection chip being a residual chlorine detection sensor chip; a reference electrode is disposed on the PCB substrate, one end of the reference electrode being located above the sensitive electrode; a substrate electrode is disposed on the PCB substrate, the substrate electrode being electrically connected to the chip contact group; a support cavity is provided at one end of the housing base, and the PCB substrate is disposed within the support cavity; the signal interface is disposed inside the housing base, and the signal interface is electrically connected to the reference electrode and the substrate electrode; the support cavity is filled with a sealing colloid, the sealing colloid immersing the PCB substrate, exposing only the sensitive electrode and the reference electrode.

[0008] Furthermore, in a preferred embodiment of this invention, the reference electrode is made of silver chloride wire.

[0009] Furthermore, in a preferred embodiment of this utility model, the signal interface is a headphone signal interface;

[0010] The housing base is provided with a connecting cavity for installing the signal interface, and a first interface mounting structure is provided at one end of the connecting cavity near the supporting cavity.

[0011] One end of the signal interface is connected to the first interface mounting structure.

[0012] Furthermore, in a preferred embodiment of this utility model,

[0013] One end of the signal interface is provided with a signal input terminal and a second interface mounting structure;

[0014] The other end of the signal interface is provided with a signal output terminal;

[0015] The second interface mounting structure is connected to the interface mounting structure via a threaded structure;

[0016] The signal input terminal is electrically connected to the reference electrode and the substrate electrode.

[0017] Furthermore, in a preferred embodiment of this utility model,

[0018] The signal output terminal is a 3-electrode TRS interface (TIP-RING-SLEEVE).

[0019] Furthermore, in a preferred embodiment of this utility model,

[0020] The signal output terminal is a 3-electrode TRS interface with a diameter of 2.5 mm.

[0021] Furthermore, in a preferred embodiment of this invention, a base mounting structure is provided at the end of the connecting cavity away from the supporting cavity.

[0022] The base mounting structure is a threaded structure, and the base mounting structure is used for connection with external installation.

[0023] The base mounting structure and the signal interface are coaxially arranged.

[0024] Furthermore, in a preferred embodiment of this utility model,

[0025] The signal output terminal protrudes from the end of the connecting cavity away from the supporting cavity.

[0026] Furthermore, in a preferred embodiment of the present invention, the outer wall of the outer shell base is provided with protrusions / recesses.

[0027] Furthermore, in a preferred embodiment of the present invention, a support portion is provided on the outer shell base, and a plurality of the support portions are spaced apart along the ends of the opening of the supporting cavity.

[0028] This utility model provides a water quality sensor chip packaging structure for residual chlorine detection, comprising: a housing base, a PCB substrate, a detection chip, and a signal interface; the detection chip is disposed on the PCB substrate, and the detection chip is provided with a sensitive electrode and a chip contact group, the detection chip being a residual chlorine detection sensor chip; a reference electrode is disposed on the PCB substrate, one end of the reference electrode being located above the sensitive electrode; a substrate electrode is disposed on the PCB substrate, the substrate electrode being electrically connected to the chip contact group; a support cavity is provided at one end of the housing base, and the PCB substrate is disposed within the support cavity; the signal interface is disposed inside the housing base, and the signal interface is electrically connected to the reference electrode and the substrate electrode; the support cavity is filled with a sealing colloid, the sealing colloid immersing the PCB substrate, exposing only the sensitive electrode and the reference electrode. Therefore, the technical solution provided by this utility model, through the organic combination of the above technical means, achieves the technical effect of selective contact between the sensitive electrode and external water, while protecting the internal circuitry from corrosion and water pressure impact, exhibiting significant technical advantages compared to existing technologies. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is an overall structural diagram of the packaging structure of a water quality sensor chip used for residual chlorine detection.

[0031] Figure 2 A cross-sectional view of the packaging structure of a water quality sensor chip used for residual chlorine detection;

[0032] Figure 3 This is a cross-sectional view of the outer casing base;

[0033] Figure 4 A schematic diagram of the first interface mounting structure and the base mounting structure;

[0034] Figure 5 This is a front view of the outer shell base structure.

[0035] Figure 6 A schematic diagram showing the arrangement of the sealing colloid in the cavity;

[0036] Figure 7 This is a schematic diagram of the detection chip;

[0037] Figure 8 This is a schematic diagram of a PCB substrate;

[0038] Figure 9 This is a schematic diagram of the signal interface. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0040] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0041] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0043] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0044] like Figures 1 to 9 As shown in the figure, the water quality sensor chip packaging structure for residual chlorine detection provided in this embodiment of the present invention specifically includes: a housing base 1, a PCB substrate 2, a detection chip 3, and a signal interface 4; the detection chip 3 is disposed on the PCB substrate 2, and the detection chip 3 is provided with a sensitive electrode 301 and a chip contact group 302, and the detection chip 3 is a residual chlorine detection sensor chip; a reference electrode 201 is disposed on the PCB substrate 2, one end of the reference electrode 201 being located above the sensitive electrode 301; a substrate electrode 202 is disposed on the PCB substrate 2, and the substrate electrode 202 is electrically connected to the chip contact group 302; a supporting cavity 101 is provided at one end of the housing base 1. The PCB substrate 2 is disposed within the supporting cavity 101; the signal interface 4 is disposed inside the outer casing base 1, and the signal interface 4 is electrically connected to the reference electrode 201 and the substrate electrode 202; the supporting cavity 101 is filled with a sealing colloid 102, which immerses the PCB substrate 2, exposing only the sensitive electrode 301 and the reference electrode 201. Therefore, the technical solution provided by this utility model, through the organic combination of the above-mentioned technical means, achieves the technical effect of enabling selective contact between the sensitive electrode and external water, while protecting the internal circuitry from corrosion and water pressure impact. Compared with the prior art, this has significant technical advantages.

[0045] The technical solution of this utility model will be specifically described below with reference to the embodiments:

[0046] Specifically, in the embodiments of this utility model, the reference electrode 201 is made of silver chloride wire.

[0047] Specifically, in an embodiment of this utility model, the signal interface 4 is a headphone signal interface;

[0048] The housing base 1 is provided with a connecting cavity 103 for installing the signal interface 4, and a first interface mounting structure 104 is provided at one end of the connecting cavity 103 near the supporting cavity 101.

[0049] One end of the signal interface 4 is connected to the first interface mounting structure 104.

[0050] Specifically, in an embodiment of this utility model, a signal input terminal 401 and a second interface mounting structure 403 are provided on one end of the signal interface 4;

[0051] The other end of the signal interface 4 is provided with a signal output terminal 402;

[0052] The second interface mounting structure 403 is connected to the interface mounting structure 104 via a threaded structure;

[0053] The signal input terminal 401 is electrically connected to the reference electrode 201 and the substrate electrode 202.

[0054] Specifically, in an embodiment of this utility model, the signal output terminal 402 is a 3-electrode TRS interface TIP-RING-SLEEVE.

[0055] It should be noted that traditional sensor packaging lacks waterproof isolation design for electrical connection structures, making internal circuits susceptible to water corrosion and water pressure impact. In this embodiment of the invention, a cylindrical shell made of rigid waterproof material is used, with an internal spiral structure and an open top to fix the PCB substrate and expose the sensitive electrode. Sealant is filled between the shell and the PCB substrate to cover the chip area and electrical connection structure, forming physical isolation. This enables selective contact between the sensitive electrode and external water, while protecting the internal circuit from corrosion and water pressure impact, thus improving the durability of the packaging.

[0056] Specifically, in an embodiment of this utility model, the signal output terminal 402 is a 3-electrode TRS interface with a diameter of 2.5 mm.

[0057] It should be noted that traditional packaging structures are complex to install and sensor chips are not easy to replace. In this embodiment of the utility model, a modular design is adopted, with a circular double-layer PCB substrate as the carrier of the chip and silver wire, which simplifies the assembly process. The top of the shell is open, and the PCB substrate is fixed with a spiral structure, which facilitates disassembly and replacement, reduces installation complexity, and improves the maintainability and replacement efficiency of the sensor.

[0058] Specifically, in an embodiment of this utility model, a base mounting structure 105 is provided at the end of the connecting cavity 103 away from the supporting cavity 101. The base mounting structure 105 is a threaded structure and is used for connection with external installation. The base mounting structure 105 and the signal interface 4 are coaxially arranged.

[0059] It should be noted that existing technologies suffer from insufficient signal transmission reliability. Traditional signal interfaces are prone to failure in humid environments, affecting the stability of the detection signal transmission. In this embodiment, a 2.5mm headphone signal interface with three electrodes is used as the signal transmission channel. Sealant is used to waterproof and fix the interface, ensuring stable signal transmission in humid environments and reducing detection errors caused by poor contact. Furthermore, existing technologies present a contradiction between the sealing of the sensitive electrode and the circuit. It is necessary to ensure direct contact between the sensitive electrode and the water body while avoiding sealant covering the electrode, which could lead to detection failure. When potting the sealant, the coverage area is precisely controlled to avoid the sensitive electrode area. An open structure at the top of the outer shell directly exposes the sensitive electrode to the water body being tested, enhancing overall sealing while ensuring the detection function of the sensitive electrode remains unaffected.

[0060] Specifically, in the embodiments of this utility model,

[0061] The signal output terminal 402 is exposed from the end of the connecting cavity 103 away from the supporting cavity 101.

[0062] Specifically, in an embodiment of this utility model, the outer wall of the outer shell base 1 is provided with a protrusion / recess 106.

[0063] Specifically, in an embodiment of the present invention, a support portion 107 is provided on the outer shell base 1, and a plurality of the support portions 107 are spaced apart along the end of the opening of the supporting cavity 101.

[0064] More specifically, this utility model relates to the field of semiconductor packaging technology, specifically a water quality sensor chip packaging structure for residual chlorine detection, suitable for integrated applications in water quality monitoring equipment. Residual chlorine detection is a crucial step in ensuring water quality safety. By rationally selecting detection methods and paying attention to relevant details, residual chlorine content can be effectively monitored and controlled, improving the disinfection effect of water. With the development of technology, residual chlorine detection technology is constantly being innovated and improved, providing strong support for ensuring the safety of people's drinking water. The principle of residual chlorine detection: Residual chlorine refers to the chloride residue remaining after the chlorinating agent added during water treatment disinfects organic matter and microorganisms in the water. Residual chlorine detection is one of the important indicators for measuring the disinfection effect of water bodies and a key step in ensuring water quality safety.

[0065] Traditional sensor chip packaging is mostly metal or ceramic. Existing packaging solutions lack waterproof isolation design for electrical connection structures, making installation complex and difficult to replace. To solve the above problems, a water quality sensor chip packaging structure for residual chlorine detection has been developed. The packaging structure involved in this utility model embodiment includes: a packaging shell: a semi-cylindrical shell with an internal spiral structure, the shell is made of a rigid waterproof material, the top of the shell is open, serving as the mounting carrier for the PCB substrate and allowing the sensitive electrode to contact the water body to be tested; a PCB substrate: adopting a circular double-layer board design, serving as the mounting carrier for the residual chlorine detection sensor chip and silver wire; a signal interface device: adopting a 2.5mm headphone signal interface, the interface contains 3 electrodes, serving as the signal transmission channel for chip detection; and sealant: filling the space between the shell and the PCB substrate, covering part of the chip area and the electrical connection structure with the substrate, enhancing overall sealing. Through the organic combination of the above technical means, the technical effect achieved by this utility model is to achieve selective contact between the sensitive electrode and the external water body, while protecting the internal circuit from corrosion and water pressure impact.

[0066] In this embodiment of the invention, the packaging method includes the following steps:

[0067] Material preparation: Provide residual chlorine sensitive chip, including sensitive electrode, package shell, sealant, PCB substrate, and signal interface device;

[0068] Electrode connection: Silver wires are soldered onto the PCB substrate, the chip is mounted on the PCB substrate, and the chip electrodes are connected to the corresponding electrodes on the substrate using gold wire bonding.

[0069] Housing assembly: Install the PCB board into the top of the housing and connect the signal interface with wires. After connection, fix the signal interface to the bottom of the housing.

[0070] Waterproofing: Apply sealant to the PCB substrate on the top of the casing, taking care to avoid covering the sensitive electrodes;

[0071] Testing: The packaging structure is tested to verify its sealing performance and test capabilities.

[0072] As can be seen from the above, traditional packaging methods lack standardized processes, resulting in poor quality consistency. This solution establishes clear packaging steps: electrode welding, chip mounting, shell assembly, waterproofing, and testing. Gold wire bonding technology is used to connect the chip electrodes to the PCB substrate, improving connection reliability, standardizing the packaging process, and improving product quality consistency and yield. Compared with existing technologies, it has significant technical advantages.

[0073] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A water quality sensor chip packaging structure for residual chlorine detection, characterized in that, include: The outer casing base (1), PCB substrate (2), detection chip (3), and signal interface (4) are all included. The detection chip (3) is disposed on the PCB substrate (2); The detection chip (3) is provided with a sensitive electrode (301) and a chip contact group (302); The detection chip (3) is a residual chlorine detection sensor chip; A reference electrode (201) is provided on the PCB substrate (2), and one end of the reference electrode (201) is located above the sensitive electrode (301); The PCB substrate (2) is provided with substrate electrodes (202), and the substrate electrodes (202) are electrically connected to the chip contact group (302); One end of the outer shell base (1) is provided with a supporting cavity (101), and the PCB substrate (2) is disposed in the supporting cavity (101); The signal interface (4) is disposed inside the housing base (1), and the signal interface (4) is electrically connected to the reference electrode (201) and the substrate electrode (202); The supporting cavity (101) is filled with sealing colloid (102).

2. The water quality sensor chip packaging structure for residual chlorine detection according to claim 1, characterized in that, The reference electrode (201) is made of silver chloride wire.

3. The water quality sensor chip packaging structure for residual chlorine detection according to claim 1, characterized in that, The signal interface (4) is a headphone signal interface; The housing base (1) is provided with a connecting cavity (103) for installing the signal interface (4), and a first interface mounting structure (104) is provided at one end of the connecting cavity (103) near the supporting cavity (101); One end of the signal interface (4) is connected to the first interface mounting structure (104).

4. The water quality sensor chip packaging structure for residual chlorine detection according to claim 3, characterized in that, The signal interface (4) is provided with a signal input terminal (401) and a second interface mounting structure (403) at one end; The other end of the signal interface (4) is provided with a signal output terminal (402); The second interface mounting structure (403) is connected to the interface mounting structure (104) via a threaded structure; The signal input terminal (401) is electrically connected to the reference electrode (201) and the substrate electrode (202).

5. The water quality sensor chip packaging structure for residual chlorine detection according to claim 4, characterized in that, The signal output terminal (402) is a 3-electrode TRS interface.

6. The water quality sensor chip packaging structure for residual chlorine detection according to claim 5, characterized in that, The signal output terminal (402) is a 3-electrode TRS interface with a diameter of 2.5 mm.

7. The water quality sensor chip packaging structure for residual chlorine detection according to claim 4, characterized in that, A base mounting structure (105) is provided at the end of the connecting cavity (103) away from the supporting cavity (101). The base mounting structure (105) is a threaded structure, and the base mounting structure (105) is used for connection with external installation. The base mounting structure (105) and the signal interface (4) are coaxially arranged.

8. The water quality sensor chip packaging structure for residual chlorine detection according to claim 4, characterized in that, The signal output terminal (402) is exposed from the end of the connecting cavity (103) away from the supporting cavity (101).

9. The water quality sensor chip packaging structure for residual chlorine detection according to any one of claims 1 to 8, characterized in that, The outer wall of the outer shell base (1) is provided with a protrusion / recess (106).

10. The water quality sensor chip packaging structure for residual chlorine detection according to any one of claims 1 to 8, characterized in that, The outer shell base (1) is provided with a support part (107), and a plurality of the support parts (107) are spaced apart along the end of the opening of the supporting cavity (101).

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