A waterproof fuse carrying an NTC sensor

Abstract

The application relates to the field of conductive fuse devices, in particular to a waterproof fuse carrying an NTC sensor, which comprises a fuse holder, an integral installation base body, an internally-arranged central sensor cavity and four internally-arranged crimping cavities; an NTC sensor, which is arranged in the sensor cavity and is used for collecting the internal working temperature of the fuse holder and externally outputting a temperature signal; a terminal, which is arranged in the crimping cavity and is in conductive connection with a wire; and a fuse, which is detachably arranged in the fuse holder. Through the built-in NTC sensor, the internal working temperature of the fuse holder cavity is collected in real time and a temperature signal is externally outputted, fault prediction is realized, the electrical system operation safety is improved, an independent central fuse cavity is arranged for accommodating a spare fuse, the overall sealing effect is improved, external spare parts are not needed to be additionally carried, the fault downtime maintenance time is shortened, and fault recovery is convenient and efficient.

Description

Technical Field

[0001] This invention relates to the field of conductive fuses, and more specifically to a waterproof fuse carrying an NTC sensor. Background Technology

[0002] As a core overcurrent protection device in circuit systems, fuses are widely used in new energy vehicles, energy storage devices, construction machinery, outdoor electrical equipment, and other scenarios. Their function is to cut off the circuit by melting their own fuse element when an overload or short-circuit fault occurs, preventing downstream electrical equipment from burning out due to overcurrent and preventing electrical fires and other safety accidents. With the continuous increase in the power of electrical equipment, the operating environment of the equipment is becoming increasingly complex. Many devices operate for extended periods in humid, oily, splash-prone, or even short-term immersion conditions. Therefore, higher requirements are placed on the waterproof performance, heat resistance, reliability, fault monitoring capabilities, and ease of maintenance of fuse holders.

[0003] Most commercially available waterproof fuse holders are manufactured using an in-situ injection molding process, where the metal terminals are directly injection molded and encased within an internal plastic matrix. While this structure provides initial fixation between the terminals and the plastic matrix, the internal molding material used in in-situ injection molding has a relatively low melting point. When the fuse operates under high current conditions, the contact area between the terminals and the fuse continuously heats up. When the temperature exceeds the melting point of the internal molding material but has not yet reached the fuse's melting threshold, the internal plastic material melts. The molten plastic flows into the contact area between the fuse and the metal terminals, further increasing the contact resistance. This increased contact resistance exacerbates localized heating, creating a vicious cycle that ultimately leads to the burning and carbonization of the fuse holder's plastic matrix. In severe cases, this can result in fuse holder burnout, casing melting, and fire hazards.

[0004] Secondly, traditional fuse holders lack temperature detection capabilities, making it impossible to obtain real-time information about their internal operating temperature. In actual operation, factors such as poor contact, loose wiring, momentary overload, and high ambient temperatures can all cause abnormal temperature rise inside the fuse holder. This overheating often occurs before the fuse blows, representing an early sign of failure. Current technology can only identify the fault after the fuse has completely blown, failing to capture early overheat warning signals. By the time the fuse blows, high-temperature damage to components has often already occurred, hindering early fault prediction and impeding the safe management of electrical systems.

[0005] Furthermore, traditional fuse holders mostly use a one-to-one independent configuration structure, with only one working fuse installed inside each fuse holder, and no spare fuse structure. Once a circuit fault triggers the fuse to blow, the equipment will immediately lose power and stop operating. On-site maintenance personnel need to carry additional spare parts, disassemble the entire fuse assembly, remove the blown fuse, and replace it with a new one. In on-site operation scenarios such as outdoor, vehicle-mounted, and construction machinery operations, carrying spare parts is inconvenient, fault repair is time-consuming, and equipment downtime is long, seriously affecting equipment operating efficiency.

[0006] Furthermore, existing conventional waterproof fuse holders have limited waterproof protection capabilities, mostly only able to withstand oil and water splashes, meeting only the needs of ordinary indoor or light protection conditions. When equipment operates in harsh environments such as rain, wading, or oil and water immersion, moisture and oil can easily seep into the fuse holder cavity through the wire outlet and the gaps in the cap assembly. Moisture ingress can cause oxidation and corrosion of the metal terminals, increasing contact resistance, while oil buildup can exacerbate localized heating, further increasing the risk of device failure and making it difficult to meet the requirements for high protection levels. Summary of the Invention

[0007] The purpose of this invention is to provide a waterproof fuse with an NTC sensor to solve the above-mentioned problems. By using the built-in NTC sensor, the internal working temperature of the fuse holder cavity is collected in real time and output to the outside, so as to realize fault prediction, improve the operational safety of the electrical system, and set up an independent central fuse cavity for storing spare fuses. This improves the overall sealing effect, eliminates the need to carry external spare parts, shortens downtime for fault repair, and makes fault recovery convenient and efficient. See the following description for details.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] This invention provides a waterproof fuse carrying an NTC sensor, comprising:

[0010] The fuse holder forms the overall mounting base, with a sensor cavity in the center and crimping cavities at the four corners inside;

[0011] The NTC sensor is assembled inside the sensor cavity and is used to collect the internal operating temperature of the fuse holder and output a temperature signal to the outside.

[0012] A terminal is assembled inside the crimping cavity, and the terminal is electrically connected to a wire.

[0013] The fuse is detachably mounted inside the fuse holder, and its two ends are electrically connected to corresponding terminals to form a current conduction circuit.

[0014] A cap, which can be opened and closed, is fitted onto the fuse side of the fuse holder to close the assembly opening of the fuse holder.

[0015] A waterproof ring is installed between the mating surfaces of the cap and the fuse holder to achieve a waterproof seal at the joint between the cap and the fuse holder.

[0016] The cable waterproof plug is fitted onto the outside of the wire and inserted into the crimping cavity along with the terminal to seal the wire outlet.

[0017] Under normal operating conditions, the current forms a conductive loop through the wires, terminals, and fuse to achieve overcurrent protection; the NTC sensor collects the internal temperature of the fuse holder in real time and outputs a temperature monitoring signal; when the fuse blows, the cap is opened to replace and maintain the fuse.

[0018] When using the above-mentioned waterproof fuse with an NTC sensor, the operating steps are as follows:

[0019] The cable waterproof plug is pre-fitted onto the outside of the wire; the wire core crimping area of ​​the terminal is crimped to the stripped wire core conductor, and the insulation crimping area of ​​the terminal is simultaneously crimped to the wire sheath and the cable waterproof plug, so that the cable waterproof plug is fixed at the junction of the terminal and the wire, completing the crimping pre-assembly of the wire, terminal and cable waterproof plug assembly.

[0020] Insert the crimped terminal assembly into the crimping cavity from the outside of the fuse holder. The anti-reverse tongue inside the crimping cavity limits and prevents the terminal from coming loose due to wire harness pulling or equipment vibration. The cable waterproof plug enters the crimping cavity along with the terminal, forming a preliminary seal at the wire exit point. Complete the assembly of all terminal assemblies in the crimping cavity according to the number of circuits.

[0021] Place the waterproof plug of the sensor into the baffle position of the sensor cavity in the fuse holder; align the NTC sensor with the sensor cavity, allow it to pass through the clearance groove and buckle point, and insert it into the sensor cavity by rotating it after insertion. During assembly, the constraint ring of the NTC sensor squeezes the waterproof plug of the sensor. After rotating it into place, the buckle groove on the outside of the constraint ring engages with the buckle point on the inner wall of the sensor cavity; the positive clamping force generated by the rebound of the squeezed waterproof plug of the sensor realizes the anti-reverse locking of the NTC sensor, completing the installation of the temperature sensing component.

[0022] Place the working fuse in the corresponding fuse chamber of the fuse holder, ensuring that both ends of the fuse are electrically connected to the terminals on both sides to establish a current conduction path. Place the spare fuse in the central fuse chamber formed by the two positioning post partitions on the side of the fuse holder away from the sensor chamber. The positioning post partitions and the spare fuse are fixed with a slight interference fit. At the same time, the spare fuse is separated from the NTC sensor to maintain a safe distance and avoid thermal impact on the spare fuse due to operating heat.

[0023] Place the waterproof ring on the mating end face of the fuse holder and the cap. The thrust rib positions and constrains the waterproof ring to prevent it from shifting or falling off. Align the cap with the assembly position and fasten it. The press-fit seat on the cap and the press-fit buckle on the fuse holder interlock and lock together. The cap closes the assembly opening of the fuse holder, and the waterproof ring achieves a waterproof seal on the cap-cap mating surface.

[0024] When the system requires multiple overcurrent protections, take multiple sets of waterproof fuses and use the splicing buckle structure on the outside of the fuse holder to push the locking block of one fuse holder along the guide groove to the locking groove of another fuse holder. The locking block and the locking groove engage and lock, completing the splicing and fixing of multiple fuse holders and realizing modular combination installation.

[0025] Connect the NTC sensor signal output terminal to the overall circuit control system, and connect the wire to the overall electrical circuit. During normal operation, the current flows through the wire, terminal, and fuse in sequence to form a conductive loop for overcurrent protection. The NTC sensor continuously collects the internal temperature of the fuse holder cavity and transmits the temperature signal to the control system in real time. When the internal temperature rises abnormally, the control system receives a warning signal and executes the overheat protection strategy.

[0026] When an overload or short circuit occurs in the circuit and the working fuse blows, press the push-button on the fuse holder to release the locking relationship between the push-button holder and the push-button, and open the cap; take out the blown working fuse, take out the pre-stored spare fuse from the central fuse chamber, and put the spare fuse into the working fuse chamber so that it makes electrical contact with the two terminals; fasten the cap back, and the push-button will lock again, thus completing the rapid fault recovery and putting the equipment back into operation.

[0027] Preferably, the inner wall of the sensor cavity is provided with a fastening point, and the outer side of the NTC sensor is provided with a fastening groove; the fastening point can engage with the fastening groove to prevent the NTC sensor from retracting after it is assembled.

[0028] Preferably, the NTC sensor is further provided with a constraint ring and a clearance groove, the clearance groove and the fastening groove being formed in a cross shape on the outside of the constraint ring; the fuse holder is provided with a baffle at the sensor cavity, the baffle being used to limit the waterproof plug of the sensor.

[0029] Preferably, the fuse holder is provided with a splicing buckle structure on its outer side. The splicing buckle structure includes a locking block and a locking groove that cooperate with each other, and a guide groove for assembly guidance. Multiple fuse holders can be spliced ​​and fixed together by the locking block and the locking groove, and the guide groove is used for assembly guidance.

[0030] Preferably, the fuse holder is provided with a press-fit buckle, and the cap is provided with a press-fit seat adapted to the press-fit buckle; the press-fit buckle and the press-fit seat engage with each other to lock the cap and the fuse holder, and pressing the press-fit buckle can release the engagement, enabling quick disassembly of the cap.

[0031] Preferably, the fuse holder is provided with a thrust rib, which is used to position and constrain the waterproof ring to prevent the waterproof ring from shifting or falling off during assembly and use.

[0032] Preferably, the crimping cavity is provided with a backstop tongue; after the terminal is inserted into the crimping cavity, the backstop tongue abuts against the limiting terminal to prevent the terminal from moving backward.

[0033] Preferably, the terminal is provided with a wire core crimping area and an insulation crimping area on its exterior; the wire core crimping area crimps the wire core to achieve conductive connection, and the insulation crimping area crimps both the wire sheath and the cable waterproof plug to fix the cable waterproof plug to the terminal.

[0034] Preferably, the fuse holder is divided into three vertically arranged fuse chambers on the side away from the sensor cavity by two positioning post partitions, wherein the central fuse chamber is used to place the spare fuse; the positioning post partitions are fixed with the spare fuse by interference fit, and at the same time isolate the spare fuse from the NTC sensor.

[0035] Preferably, the fuse holder has a conductive cavity structure inside to facilitate heat flow and transfer within the fuse holder.

[0036] The beneficial effects are as follows: 1. This invention uses a built-in NTC sensor to collect the working temperature inside the fuse holder cavity in real time and output the temperature signal to the outside. In the early overheating stage before the fuse blows, the system can obtain the temperature warning signal and execute the overheat protection strategy in advance. This changes the passive mode of traditional products that can only identify the fault after the fuse blows, realizes fault prediction, and improves the safety of electrical system operation.

[0037] 2. The NTC sensor adopts an insertion and rotation positioning assembly method. The cross-shaped clearance groove and fastening groove on the outer side of the constraint ring, together with the fastening points on the inner wall of the sensor cavity, achieve anti-reverse locking. At the same time, the rebound force of the sensor's waterproof plug provides positive clamping force. The assembly is simple, the sensor is firmly fixed, and the vibration resistance is strong, ensuring stable and accurate temperature acquisition. The fuse holder adopts a conductive cavity structure, which facilitates the internal heat flow and transfer, further ensuring the temperature measurement accuracy of the NTC sensor.

[0038] 3. An independent central fuse compartment is provided to store the spare fuse. The spare fuse is reliably fixed by a slight interference fit between the spare fuse and two positioning column partitions. The spare fuse is not easy to move or shift under equipment vibration conditions. There is no need to carry external spare parts, which shortens the downtime for fault repair. It is especially suitable for application scenarios with limited on-site maintenance conditions such as outdoor, vehicle-mounted, and construction machinery. Fault recovery is convenient and efficient.

[0039] 4. A waterproof ring is installed at the mating position between the cap and the fuse holder, and the waterproof ring is limited and constrained by a thrust rib to prevent the waterproof ring from shifting or falling off; a cable waterproof plug is installed at the wire exit position, and the cable waterproof plug is simultaneously pressed and fixed by the terminal insulation crimping area; a sensor waterproof plug is matched at the sensor position. Multiple seals work together to improve the product's protection effect, adapt to harsh working conditions such as rain, water immersion, and oil and moisture, and reduce failure problems such as terminal corrosion and increased contact resistance caused by water and gasoline intrusion.

[0040] 5. The fuse holder is equipped with a splicing buckle structure on the outside. With the cooperation of locking blocks, locking grooves and guide grooves, multiple fuse holders can be quickly spliced ​​and combined. When facing multi-circuit protection requirements, there is no need to fix each fuse holder individually, reducing installation parts, simplifying the whole machine assembly process, saving internal layout space of the equipment, and making the wiring harness neatly arranged, which also facilitates the later whole machine inspection and maintenance. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a front view structural diagram of the present invention;

[0043] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0044] Figure 3 This is a right-side structural diagram of the present invention;

[0045] Figure 4 This is a three-dimensional structural schematic diagram of another aspect of the present invention;

[0046] Figure 5 This is a partial structural breakdown diagram of the present invention;

[0047] Figure 6 This is a three-dimensional structural disassembly diagram of the present invention;

[0048] Figure 7This is a three-dimensional structural disassembly diagram of another aspect of the present invention;

[0049] Figure 8 This is a three-dimensional structural schematic diagram of the fuse holder of the present invention;

[0050] Figure 9 This is a right-side structural view of the fuse holder of the present invention;

[0051] Figure 10 This is the present invention. Figure 9 Cross-sectional view of section AA;

[0052] Figure 11 This is a three-dimensional structural disassembled diagram of the fuse holder of the present invention;

[0053] Figure 12 This is a three-dimensional structural schematic diagram of the terminal of the present invention;

[0054] Figure 13 This is a three-dimensional structural disassembled diagram of the terminal of the present invention;

[0055] Figure 14 This is a three-dimensional structural schematic diagram of the NTC sensor of the present invention;

[0056] Figure 15 This is a schematic diagram of the modular assembly of the fuse holder of the present invention.

[0057] The annotations in the attached figures are explained as follows:

[0058] 1. Fuse holder; 101. Sensor cavity; 102. Clip; 103. Baffle; 104. Locking outer clip; 104a. Locking block; 105. Locking inner clip; 105a. Locking groove; 105b. Guide groove; 106. Press-fit buckle; 107. Thrust rib; 108. Crimping cavity; 108a. Anti-reverse tongue; 109. Positioning post partition; 2. NTC sensor; 201. Constraint ring; 202. Alternating groove; 203. Snap-fit ​​groove; 3. Sensor waterproof plug; 4. Wire; 5. Cable waterproof plug; 6. Terminal; 601. Wire core crimping area; 602. Insulation crimping area; 7. Fuse; 8. Cap; 801. Press-fit holder; 9. Waterproof ring. Detailed Implementation

[0059] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0060] It should be noted that all directional and positional terms used in this invention, such as "up," "down," "left," "right," "front," "back," "vertical," "horizontal," "inner," "outer," "top," "lower," "lateral," "longitudinal," and "center," are only used to explain the relative positional relationships and connections between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0061] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0062] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the 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.

[0063] See Figures 1-15 As shown, the present invention provides a waterproof fuse carrying an NTC sensor, comprising:

[0064] The fuse holder 1 forms the overall mounting base, and has a sensor cavity 101 located in the center and crimping cavities 108 located at the four corners inside, which are used to provide installation and accommodation space for various components and realize the integrated arrangement of various functional components.

[0065] NTC sensor 2 is assembled inside sensor cavity 101 and is used to collect the internal working temperature of fuse holder 1 and output temperature signal to the outside. It serves as a sensing element for the overheating state inside the device and realizes real-time monitoring of the internal temperature of fuse holder 1.

[0066] Terminal 6 is assembled in crimping cavity 108. Terminal 6 is electrically connected to wire 4 to realize the conductive transition between wire 4 and fuse 7 and ensure stable current transmission.

[0067] Fuse 7 is detachably mounted inside fuse holder 1. Both ends of fuse 7 are electrically connected to the corresponding terminals 6 to form a current conduction circuit. It serves as an overcurrent protection actuator for the circuit, melting and cutting off the circuit when the circuit is overloaded or short-circuited.

[0068] The cap 8 is foldably mounted on the fuse 7 side of the fuse holder 1 to close the assembly opening of the fuse holder 1, thereby providing physical protection for the internal fuse 7 and sensing components, and also working with the sealing component to achieve overall protection.

[0069] The waterproof ring 9 is set between the mating surfaces of the cap 8 and the fuse holder 1 to achieve a waterproof seal at the joint between the cap 8 and the fuse holder 1. As a sealing medium for the joint surface, it prevents external moisture and oil from entering the cavity through the gap between the cap 8 and the fuse holder 1.

[0070] The cable waterproof plug 5 is sleeved on the outside of the wire 4 and is installed into the crimping cavity 108 together with the terminal 6 to seal the wire 4 outlet position, thereby blocking the assembly gap between the wire 4 and the fuse holder 1 and preventing the medium from entering the product from the wire harness outlet.

[0071] Under normal operating conditions, the current forms a conductive loop through wire 4, terminal 6, and fuse 7 to achieve overcurrent protection; NTC sensor 2 collects the internal temperature of fuse holder 1 in real time and outputs a temperature monitoring signal; when fuse 7 blows, the cap 8 is opened to replace and maintain fuse 7, serving as a protection unit for the entire electrical circuit, and also having the ability to provide temperature warning and rapid fault repair.

[0072] As an optional implementation, a fastening point 102 is provided on the inner wall of the sensor cavity 101, and a fastening groove 203 is provided on the outside of the NTC sensor 2; the fastening point 102 can fasten with the fastening groove 203 to prevent the NTC sensor 2 from falling back after assembly. With this configuration, the snap-fit ​​and limiting structure of the fastening point 102 and the fastening groove 203 can prevent the NTC sensor 2 from falling back due to vibration or pulling, and ensure the stability of the sensor assembly position.

[0073] The NTC sensor 2 is also provided with a constraint ring 201 and a clearance groove 202. The clearance groove 202 and the fastening groove 203 are formed in a cross shape on the outside of the constraint ring 201. The fuse holder 1 is provided with a baffle 103 at the sensor cavity 101. The baffle 103 is used to limit the sensor waterproof plug 3. This setting can be adapted to the assembly form of NTC sensor 2 being inserted and rotated. During the assembly rotation process, the clearance groove 202 plays a guiding role, and the baffle 103 can constrain the position of the sensor waterproof plug 3, ensuring the sealing effect while providing continuous positive clamping force for NTC sensor 2.

[0074] The fuse holder 1 is provided with a splicing buckle structure on its outer side. The splicing buckle structure includes an outer locking buckle 104 and an inner locking buckle 105 fixed to both sides of the fuse holder 1 respectively. The splicing buckle structure also includes a locking block 104a and a locking groove 105a that cooperate with each other. The outer side of the inner locking buckle 105 is provided with a guide groove 105b for assembly guidance. Multiple fuse holders 1 can be spliced ​​and fixed with each other through the locking block 104a and the locking groove 105a. The guide groove 105b is used for assembly guidance, so as to realize the splicing and fixing of multiple fuse holders 1. With this setting, multiple sets of fuse holders 1 can be quickly assembled in a modular combination, adapting to multiple electrical protection circuits, simplifying the installation of the whole machine, and saving layout space.

[0075] A push-button latch 106 is provided on the fuse holder 1, and a push-button seat 801 is provided on the cap 8 to match the push-button latch 106. The push-button latch 106 and the push-button seat 801 are engaged to lock the cap 8 and the fuse holder 1. Pressing the push-button latch 106 can release the engagement, allowing the cap 8 to be quickly disassembled. This design facilitates reliable locking and quick opening of the cap 8, while also ensuring reliable locking under normal operating conditions and convenient replacement and maintenance of the fuse 7.

[0076] The fuse holder 1 is provided with a thrust rib 107, which is used to position and constrain the waterproof ring 9 to prevent the waterproof ring 9 from shifting or falling off during assembly and use, thereby ensuring that the waterproof ring 9 is always in a sealed fit position and maintaining the sealing and waterproof performance of the cap 8 joint for a long time.

[0077] The crimping cavity 108 is provided with a backstop tongue 108a; after the terminal 6 is inserted into the crimping cavity 108, the backstop tongue 108a abuts against the limiting terminal 6 to prevent the terminal 6 from moving backward. This is used to resist the risk of the terminal 6 moving backward caused by wire harness pulling and equipment vibration, and to ensure the stability of the contact and conduction between the terminal 6 and the fuse 7.

[0078] Terminal 6 is provided with a wire core crimping area 601 and an insulation crimping area 602 on the outside. The wire core crimping area 601 crimps the wire core of the wire 4 to achieve a conductive connection. The insulation crimping area 602 crimps the outer sheath of the wire 4 and the cable waterproof plug 5 at the same time, fixing the cable waterproof plug 5 to the terminal 6. Thus, the electrical connection and wire harness sealing are integrated into one, ensuring reliable conductivity while fixing the sealing component and preventing the sealing component from falling off and failing.

[0079] The fuse holder 1, on the side away from the sensor cavity 101, is divided into three vertically arranged fuse cavities by two positioning post partitions 109. The central fuse cavity is used to hold the spare fuse 7. The positioning post partitions 109 are fixed with the spare fuse 7 by interference fit, and at the same time, the spare fuse 7 is isolated from the NTC sensor 2, thereby achieving reliable fixation of the spare fuse 7, avoiding vibration and movement problems, and isolating the working heat source to avoid thermal interference affecting the working performance of the spare fuse 7 and the NTC sensor 2.

[0080] The fuse holder 1 has a conductive cavity structure inside, which facilitates the flow and transfer of heat inside the fuse holder 1. This allows for the uniform diffusion of heat within the cavity, ensuring that the temperature collected by the NTC sensor 2 can accurately reflect the actual operating temperature inside the product and improve temperature measurement accuracy.

[0081] Using the above structure, the operating steps are as follows:

[0082] The cable waterproof plug 5 is pre-fitted onto the outside of the wire 4; the wire core crimping area 601 of the terminal 6 is crimped onto the stripped wire core conductor of the wire 4, and the insulation crimping area 602 of the terminal 6 is simultaneously crimped onto the outer sheath of the wire 4 and the cable waterproof plug 5, so that the cable waterproof plug 5 is fixed at the joint position of the terminal 6 and the wire 4, and the pre-assembly of the wire 4, terminal 6 and cable waterproof plug 5 assembly is completed.

[0083] The crimped terminal 6 assembly is inserted into the crimping cavity 108 from the outside of the fuse holder 1. The anti-reverse tongue 108a inside the crimping cavity 108 limits and blocks the terminal 6, preventing it from coming loose due to wire harness pulling or equipment vibration. The cable waterproof plug 5 enters the crimping cavity 108 along with the terminal 6, forming a preliminary seal at the wire 4 exit position. The assembly of all terminal 6 assemblies in the crimping cavity 108 is completed according to the number of circuits.

[0084] Place the waterproof plug 3 of the sensor into the baffle 103 position of the sensor cavity 101 of the fuse holder 1; align the NTC sensor 2 with the sensor cavity 101, allow it to pass through the locking point 102 along the clearance groove 202, and insert it into the sensor cavity 101 by rotating it after insertion. During the assembly process, the constraint ring 201 of the NTC sensor 2 squeezes the waterproof plug 3 of the sensor. After rotating it into place, the outer locking groove 203 of the constraint ring 201 and the locking point 102 on the inner wall of the sensor cavity 101 engage with each other; the positive clamping force generated by the rebound of the squeezed waterproof plug 3 is used to lock the NTC sensor 2, thus completing the installation of the temperature sensing component.

[0085] Place the working fuse 7 in the corresponding fuse cavity of the fuse holder 1, so that both ends of the fuse 7 are electrically connected to the terminals 6 on both sides to establish a current conduction path; place the spare fuse 7 in the central fuse cavity formed by the two positioning post partitions 109 on the side of the fuse holder 1 away from the sensor cavity 101. The positioning post partitions 109 and the spare fuse 7 are fixed by a slight interference fit. At the same time, the spare fuse 7 is separated from the NTC sensor 2 to maintain a safe distance and avoid the heat generated during operation from affecting the spare fuse 7.

[0086] The waterproof ring 9 is placed on the mating end face of the fuse holder 1 and the cap 8. The thrust rib 107 positions and constrains the waterproof ring 9 to prevent it from shifting or falling off. The cap 8 is then fastened to the assembly position. The pressing seat 801 on the cap 8 and the pressing buckle 106 on the fuse holder 1 are interlocked and locked together. The cap 8 closes the assembly opening of the fuse holder 1, and the waterproof ring 9 is used to achieve a waterproof seal on the mating surface of the cap 8.

[0087] When the system requires multi-path overcurrent protection, take multiple sets of waterproof fuses 7, and use the splicing buckle structure on the outside of the fuse holder 1 to push the locking block 104a of one fuse holder 1 into the locking groove 105a of another fuse holder 1 along the guide groove 105b. The locking block 104a and the locking groove 105a are locked together, completing the splicing and fixing of multiple fuse holders 1 and realizing modular combination installation.

[0088] Connect the signal output terminal of NTC sensor 2 to the overall circuit control system, and connect wire 4 to the overall electrical circuit. During normal operation, the current flows through wire 4, terminal 6, and fuse 7 in sequence to form a conductive circuit for overcurrent protection. NTC sensor 2 continuously collects the internal temperature of fuse holder 1 and transmits the temperature signal to the control system in real time. When the internal temperature rises abnormally, the control system receives a warning signal and executes the overheat protection strategy.

[0089] When an overload or short circuit occurs in the circuit, and the working fuse 7 blows, press the pressing latch 106 on the fuse holder 1 to release the locking relationship between the pressing latch 801 and the pressing latch 106, and open the cap 8; take out the blown working fuse 7, take out the pre-stored spare fuse 7 from the central fuse cavity, and put the spare fuse 7 into the working fuse cavity so that it makes electrical contact with the terminals 6 at both ends; fasten the cap 8 again, and the latch will lock again, thus completing the rapid fault recovery and putting the equipment back into operation.

[0090] By using the built-in NTC sensor 2, the internal working temperature of the fuse holder 1 cavity is collected in real time and the temperature signal is output to the outside. In the early overheating stage before the fuse 7 blows, the system can obtain the temperature warning signal and execute the overheat protection strategy in advance. This changes the passive mode of traditional products that can only identify the fault after the fuse 7 blows, realizes fault prediction, and improves the operational safety of the electrical system.

[0091] The NTC sensor 2 adopts an insertion and rotation positioning assembly method. The cross-shaped clearance groove 202 and the fastening groove 203 on the outer side of the constraint ring 201, together with the fastening point 102 on the inner wall of the sensor cavity 101, achieve anti-reverse locking. At the same time, the rebound force of the sensor waterproof plug 3 provides positive clamping force. The assembly is simple, the sensor is firmly fixed, and the vibration resistance is strong, ensuring stable and accurate temperature acquisition. The fuse holder 1 adopts a conductive cavity structure, which is conducive to the internal heat flow and transfer, further ensuring the temperature measurement accuracy of the NTC sensor 2.

[0092] An independent central fuse chamber is provided to house the spare fuse 7. The spare fuse 7 is reliably fixed by a slight interference fit between the two positioning column partitions 109 and the spare fuse 7. Under equipment vibration conditions, the spare fuse 7 is not easy to move or shift. There is no need to carry external spare parts, which shortens the downtime for fault repair. It is especially suitable for application scenarios with limited on-site maintenance conditions, such as outdoor, vehicle-mounted, and construction machinery. Fault recovery is convenient and efficient.

[0093] A waterproof ring 9 is installed at the mating position between the cap 8 and the fuse holder 1, and the waterproof ring 9 is limited and constrained by the thrust rib 107 to prevent the waterproof ring 9 from shifting or falling off; a cable waterproof plug 5 is installed at the outlet position of the wire 4, and the cable waterproof plug 5 is synchronously pressed and fixed by the insulation crimping area 602 of the terminal 6; a sensor waterproof plug 3 is matched at the sensor position. The multiple seals work together to improve the product's protection effect, adapt to harsh working conditions such as rain, water immersion, and oil and moisture, and reduce failure problems such as terminal 6 corrosion and increased contact resistance caused by water and gasoline intrusion.

[0094] The fuse holder 1 is equipped with a splicing buckle structure on the outside. With the cooperation of the locking block 104a, locking groove 105a and guide groove 105b, multiple fuse holders 1 can be quickly spliced ​​together. When facing multi-circuit protection requirements, there is no need to fix each fuse holder 1 separately, reducing installation parts, simplifying the whole machine assembly process, saving internal layout space of the equipment, and making the wiring harness neatly arranged, which also facilitates the later whole machine inspection and maintenance.

[0095] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A waterproof fuse carrying an NTC sensor, characterized in that, include: The fuse holder (1) forms an integral mounting base, and has a sensor cavity (101) located in the center and crimping cavities (108) located at the four corners inside. The NTC sensor (2) is assembled inside the sensor cavity (101) and is used to collect the internal working temperature of the fuse holder (1) and output the temperature signal to the outside. Terminal (6) is assembled in the crimping cavity (108) and is electrically connected to the wire (4); The fuse (7) is detachably mounted inside the fuse holder (1). The two ends of the fuse (7) are electrically connected to the corresponding terminals (6) to form a current conduction circuit. The cap (8) is foldably mounted on the fuse (7) side of the fuse holder (1) to close the mounting opening of the fuse holder (1); A waterproof ring (9) is set between the mating surfaces of the cap (8) and the fuse holder (1) to achieve a waterproof seal at the joint between the cap (8) and the fuse holder (1); The cable waterproof plug (5) is sleeved on the outside of the wire (4) and installed into the crimping cavity (108) together with the terminal (6) to achieve sealing of the wire (4) outlet position.

2. The waterproof fuse carrying an NTC sensor according to claim 1, characterized in that, The sensor cavity (101) has a snap point (102) on its inner wall and a snap groove (203) on its outer side. The snap point (102) can engage with the snap groove (203) to stop and limit the NTC sensor (2) after it is assembled.

3. The waterproof fuse carrying an NTC sensor according to claim 2, characterized in that, The NTC sensor (2) is also provided with a constraint ring (201) and a clearance groove (202). The clearance groove (202) and the fastening groove (203) are opened in a cross shape on the outside of the constraint ring (201). The fuse holder (1) is provided with a baffle (103) at the sensor cavity (101). The baffle (103) is used to limit the waterproof plug (3) of the sensor.

4. The waterproof fuse carrying an NTC sensor according to claim 1, characterized in that, The fuse holder (1) is provided with a splicing buckle structure on its outer side. The splicing buckle structure includes a locking block (104a) and a locking groove (105a) that cooperate with each other, and a guide groove (105b) for assembly guidance. Multiple fuse holders (1) can be spliced ​​and fixed with each other through the locking block (104a) and the locking groove (105a). The guide groove (105b) is used for assembly guidance, so as to realize the splicing and fixing of multiple fuse holders (1).

5. The waterproof fuse carrying an NTC sensor according to claim 1, characterized in that, The fuse holder (1) is provided with a press buckle (106), and the cap (8) is provided with a press seat (801) that is compatible with the press buckle (106). The press buckle (106) and the press seat (801) are engaged with each other to lock the cap (8) and the fuse holder (1). Pressing the press buckle (106) can release the engagement and enable the cap (8) to be quickly disassembled.

6. The waterproof fuse carrying an NTC sensor according to claim 5, characterized in that, The fuse holder (1) is provided with a thrust rib (107), which is used to position and constrain the waterproof ring (9) to prevent the waterproof ring (9) from shifting or falling off during assembly and use.

7. The waterproof fuse carrying an NTC sensor according to claim 1, characterized in that, The crimping cavity (108) is provided with a backstop tongue (108a); after the terminal (6) is inserted into the crimping cavity (108), the backstop tongue (108a) abuts against the limiting terminal (6) to prevent the terminal (6) from moving backward.

8. The waterproof fuse carrying an NTC sensor according to claim 7, characterized in that, The terminal (6) is provided with a wire core crimping area (601) and an insulation crimping area (602) on the outside; the wire core crimping area (601) crimps the wire core of the wire (4) to achieve conductive connection, and the insulation crimping area (602) crimps the outer sheath of the wire (4) and the cable waterproof plug (5) to fix the cable waterproof plug (5) on the terminal (6).

9. The waterproof fuse carrying an NTC sensor according to claim 8, characterized in that, The fuse holder (1) is divided into three vertically arranged fuse chambers on the side away from the sensor chamber (101) by two positioning post partitions (109), wherein the fuse chamber located in the center is used to place the spare fuse (7); the positioning post partition (109) is fixed with the spare fuse (7) by interference fit, and at the same time isolates the spare fuse (7) from the NTC sensor (2).

10. The waterproof fuse carrying an NTC sensor according to claim 1, characterized in that, The fuse holder (1) is configured with a conductive cavity structure to facilitate the flow and transfer of heat inside the fuse holder (1).

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