Fixing structure of cylindrical thermistor

Abstract

The utility model relates to thermistor technical field, and disclose a kind of fixing structure of cylindrical thermistor, including welding with substrate, the welding with substrate top is provided with multiple clamping position installation device, clamping position installation device inside is equipped with cylindrical thermistor body, the welding with substrate both sides are provided with external sleeve pipe fitting, the welding with substrate includes integrated circuit board structure, fixed mouth, and bottom plate structure, the welding with substrate top is equipped with integrated circuit board structure, multiple fixed mouth is opened in the both sides of integrated circuit board structure, the welding with substrate bottom is equipped with bottom plate structure. The fixing structure of cylindrical thermistor, by welding with substrate is welded on mainboard, welding point is welded together with external sleeve pipe fitting on mainboard, by multiple cylindrical thermistor body is integrated, one-time welding prevents other accessories on the intensive mainboard interference, increases resistance installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of thermistor technology, specifically to a fixed structure for a cylindrical thermistor. Background Technology

[0002] A thermistor is a type of sensor resistor whose resistance changes with temperature. Based on their temperature coefficient, they are classified into positive temperature coefficient (PTC) thermistors and negative temperature coefficient (NTC) thermistors. The resistance of a PTC cylindrical thermistor increases with increasing temperature, while the resistance of an NTC cylindrical thermistor decreases with increasing temperature. Both are semiconductor devices, and thermistors will remain inactive for extended periods. When the ambient temperature and current are in region C, the thermistor's heat dissipation and heat generation are close, so it may or may not activate. At the same ambient temperature, the operating time of a thermistor decreases sharply with increasing current. At relatively higher ambient temperatures, thermistors have even shorter operating times and lower holding and operating currents. The PTC effect refers to a material exhibiting a positive temperature coefficient, meaning that the material's resistance increases with increasing temperature. Most metallic materials exhibit the PTC effect. In these materials, the PTC effect manifests as a linear increase in resistance with increasing temperature; this is commonly referred to as the linear PTC effect. The nonlinear PTC effect refers to the phenomenon where, after a phase transition, the resistance of a material increases sharply by several to tens of orders of magnitude over a narrow temperature range; this is the nonlinear PTC effect. Many types of conductive polymers exhibit this effect, such as polymer PTC thermistors. These conductive polymers are very useful for manufacturing overcurrent protection devices. Polymer PTC thermistors are used for overcurrent protection and are often called resettable fuses (simply called thermistors). Due to their unique positive temperature coefficient resistance characteristics, they are extremely suitable for use as overcurrent protection devices. Thermistors are used like ordinary fuses, connected in series in a circuit. When the circuit is working normally, the thermistor's temperature is close to room temperature, and its resistance is very small, so it does not impede current flow when connected in series. However, when an overcurrent occurs due to a fault, the thermistor's temperature rises due to increased heating power. When the temperature exceeds the switching temperature, the resistance increases dramatically, and the current in the circuit rapidly decreases to a safe value. This diagram illustrates the current change during the protection of an AC circuit by a thermistor. After the thermistor trips, the current in the circuit decreases significantly. t represents the tripping time of the thermistor.Due to the good designability of polymer PTC thermistors, their temperature sensitivity can be adjusted by changing their switching temperature (ts), thus providing both over-temperature and over-current protection. For example, the KT16-1700DL thermistor, with its very low operating temperature, is suitable for over-current and over-temperature protection in lithium-ion and nickel-metal hydride batteries. The influence of ambient temperature on polymer PTC thermistors: Polymer PTC thermistors are directly heated, step-type thermistors. Their resistance change is related to their own heating and cooling, therefore their holding current (ihold), operating current (itrip), and operating time are affected by ambient temperature. When the ambient temperature and current are in region A, the thermistor's heating power exceeds its cooling power, causing it to activate. When the ambient temperature and current are in region B, the heating power is less than the cooling power, and the polymer PTC thermistor can be reused multiple times because its resistance is recoverable. A schematic diagram showing the resistance change over time during the recovery process after activation is provided. The resistance typically recovers to about 1.6 times its initial value within tens of seconds. At this point, the thermistor's holding current has returned to its rated value, and it can be used again. Thermistors with smaller area and thickness recover relatively quickly, while those with larger area and thickness recover relatively slowly. The resistance-temperature characteristic of a thermistor can be approximately expressed by the following formula: R = R0exp{B(1 / T-1 / T0)}: R: resistance value at temperature T (K), Ro: resistance value at temperature T0 (K), B: B value, *T(K)=t(ºC)+273.15. In reality, the B value of a thermistor is not constant; its variation varies depending on the material composition, and can even reach a maximum of 5K / °C. Therefore, when applying Equation 1 over a wide temperature range, there will be a certain error between the applied value and the measured value. Here, if the value of B in Equation 1 is calculated as a function of temperature using Equation 2, the error between it and the measured value can be reduced, and they can be considered approximately equal. Currently, the fixed structure of the cylindrical thermistor is inconvenient to weld on densely packed motherboards, which affects the installation of the thermistor. Utility Model Content

[0003] Technical problems to be solved

[0004] To address the shortcomings of existing technologies, this utility model provides a fixing structure for a cylindrical thermistor, which solves the problem that the current fixing structure for cylindrical thermistors is inconvenient to solder on densely packed motherboards, thus affecting the installation of the thermistors.

[0005] (II) Technical Solution

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fixing structure for a cylindrical thermistor, comprising a welding substrate, wherein a plurality of locking mounting devices are provided on the top of the welding substrate, the cylindrical thermistor body is installed inside the locking mounting devices, and external sleeve fittings are provided on both sides of the welding substrate.

[0007] The welding substrate includes an integrated circuit board structure, fixing ports, and a bottom plate structure. The top of the welding substrate is an integrated circuit board structure, and multiple fixing ports are opened on both sides of the integrated circuit board structure. The bottom of the welding substrate is a bottom plate structure, through which the entire welding substrate can be welded onto the motherboard.

[0008] The mounting device includes a fixing block and a resistor mounting slot structure. The main body of the mounting device is the fixing block, and the top of the fixing block has a resistor mounting slot structure. The cylindrical thermistor body is installed inside the resistor mounting slot structure.

[0009] The cylindrical thermistor body has welding points on both sides. By placing non-flammable heat-resistant cement inside the cylindrical thermistor body and setting the conductive layer of the cylindrical thermistor body as a glass glaze film, the cylindrical thermistor body is improved in terms of heat dissipation, moisture resistance, high temperature resistance, and safety and reliability. It can be used in some high-power and high-current applications. The welding points are inserted into the external sleeve fitting.

[0010] The external sleeve fitting includes a solder tube and a connector. The outside of the external sleeve fitting is provided with a solder tube, and the inside of the solder tube is provided with a connector.

[0011] The welding substrate is welded to the motherboard, and the welding point, together with the external sleeve fitting, is welded to the motherboard. By integrating multiple cylindrical thermistor bodies into one unit and welding them at once, interference with other components on the densely packed motherboard is prevented, increasing resistor installation efficiency. By installing the cylindrical thermistor bodies inside the resistor mounting slot structure, by placing non-flammable heat-resistant cement inside the cylindrical thermistor bodies, and by setting the conductive layer of the cylindrical thermistor bodies as a glass glaze film, the cylindrical thermistor bodies are improved in terms of heat dissipation, moisture resistance, high temperature resistance, and safety and reliability. They can be used in some high-power and high-current applications. The welding point is inserted into the external sleeve fitting, the welding substrate is welded to the motherboard, and the welding point, together with the external sleeve fitting, is welded to the motherboard. By integrating multiple cylindrical thermistor bodies into one unit and welding them at once, interference with other components on the densely packed motherboard is prevented, increasing resistor installation efficiency.

[0012] Compared with the prior art, this utility model provides a fixing structure for a cylindrical thermistor, which has the following advantages:

[0013] The fixed structure of this cylindrical thermistor involves welding a soldering substrate onto a main board, and then welding the soldering points together with the external bushing fittings onto the main board. By assembling multiple cylindrical thermistor bodies into one unit and welding them at once, interference with other components on the densely packed main board is prevented, increasing resistor installation efficiency. By placing non-flammable heat-resistant cement inside the cylindrical thermistor body and using a glass glaze film as the conductive layer of the cylindrical thermistor body, the cylindrical thermistor body is improved in terms of heat dissipation, moisture resistance, high temperature resistance, and safety and reliability, making it suitable for applications with high power and high current. Attached Figure Description

[0014] Figure 1 This is a side view of the present invention.

[0015] Figure 2 This is a top view of the structure of this utility model;

[0016] Figure 3 This is a bottom view of the structure of this utility model.

[0017] Among them: 1. Welding substrate; 101. Integrated circuit board structure; 102. Fixing port; 103. Bottom plate structure; 2. Positioning and mounting device; 201. Fixing block; 202. Resistor mounting slot structure; 3. Columnar thermistor body; 4. External sleeve fitting; 401. Welding tin tube; 402. Insertion interface; 5. Welding point. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Please see Figure 1-3 The present invention provides the following technical solution: a fixing structure for a cylindrical thermistor, including a welding substrate 1, a plurality of locking mounting devices 2 on the top of the welding substrate 1, a cylindrical thermistor body 3 installed inside the locking mounting devices 2, and external sleeve fittings 4 on both sides of the welding substrate 1.

[0022] In the first embodiment of this utility model, the welding substrate 1 includes an integrated circuit board structure 101, a fixing port 102, and a bottom plate structure 103. The top of the welding substrate 1 is the integrated circuit board structure 101, and multiple fixing ports 102 are opened on both sides of the integrated circuit board structure 101. The bottom of the welding substrate 1 is the bottom plate structure 103. The entire welding substrate 1 can be welded to the motherboard through the bottom plate structure 103. The positioning and mounting device 2 includes a fixing block 201 and a resistor mounting groove structure 202. The main body of the positioning and mounting device 2 is the fixing block 201. The top of the fixing block 201 is opened with the resistor mounting groove structure 202. The cylindrical thermistor body 3 is installed inside the resistor mounting groove structure 202.

[0023] In the second embodiment of this utility model, welding points 5 are provided on both sides of the cylindrical thermistor body 3. By setting non-flammable heat-resistant cement inside the cylindrical thermistor body 3 and setting the conductive layer of the cylindrical thermistor body 3 as a glass glaze film, the cylindrical thermistor body 3 is improved in terms of heat dissipation, moisture resistance, high temperature resistance, and safety and reliability. It can be used in some high power and high current applications. The welding points 5 are inserted into the external sleeve fitting 4. The external sleeve fitting 4 includes a solder tube 401 and a plug interface 402. The outside of the external sleeve fitting 4 is provided with a solder tube 401, and the plug interface 402 is opened inside the solder tube 401. The welding substrate 1 is welded to the main board. The welding points 5 are welded together with the external sleeve fitting 4 to the main board. By assembling multiple cylindrical thermistor bodies 3 into one piece and welding them at one time, interference with other components on the dense main board is prevented, and the resistor installation efficiency is increased.

[0024] In use, the cylindrical thermistor body 3 is installed inside the resistor mounting slot structure 202. By placing non-flammable heat-resistant cement inside the cylindrical thermistor body 3 and setting the conductive layer of the cylindrical thermistor body 3 as a glass glaze film, the cylindrical thermistor body 3 is improved in terms of heat dissipation, moisture resistance, high temperature resistance, and safety and reliability. It can be used in some high-power and high-current applications. The soldering point 5 is inserted into the external sleeve fitting 4, the soldering substrate 1 is soldered to the main board, and the soldering point 5 and the external sleeve fitting 4 are soldered together to the main board. By assembling multiple cylindrical thermistor bodies 3 into one piece and soldering them at one time, interference with other components on the dense main board is prevented, and the resistor installation efficiency is increased.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a reference structure" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A fixing structure for a cylindrical thermistor, comprising a welding substrate (1), characterized in that: The welding substrate (1) is provided with multiple slot mounting devices (2) on the top. A cylindrical thermistor body (3) is installed inside the slot mounting device (2). External sleeve fittings (4) are provided on both sides of the welding substrate (1). Welding points (5) are provided on both sides of the cylindrical thermistor body (3). The welding points (5) are inserted into the external sleeve fittings (4).

2. The fixing structure of a cylindrical thermistor according to claim 1, characterized in that: The welding substrate (1) includes an integrated circuit board structure (101), a fixing port (102), and a bottom plate structure (103). The top of the welding substrate (1) is provided as the integrated circuit board structure (101).

3. The fixing structure of a cylindrical thermistor according to claim 2, characterized in that: The integrated circuit board structure (101) has multiple fixing holes (102) on both sides, and the bottom of the welding substrate (1) is set as a bottom plate structure (103).

4. The fixing structure of a cylindrical thermistor according to claim 1, characterized in that: The mounting device (2) includes a fixing block (201) and a resistor placement groove structure (202). The main body of the mounting device (2) is the fixing block (201), and the resistor placement groove structure (202) is opened on the top of the fixing block (201).

5. The fixing structure of a cylindrical thermistor according to claim 1, characterized in that: The external sleeve fitting (4) includes a solder tube (401) and a plug interface (402). The outer side of the external sleeve fitting (4) is provided with a solder tube (401), and the plug interface (402) is opened inside the solder tube (401).

6. The fixing structure of a cylindrical thermistor according to claim 1, characterized in that: The welding substrate (1) is welded to the motherboard, and the welding point (5) is welded to the motherboard together with the external sleeve fitting (4).

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