Heat conduction assembly and fuse

Abstract

The invention discloses a heat conduction assembly and a fuse, relates to the technical field of electrics, and aims to solve the problem that different parts of a current limiting element have different requirements on heat conduction performance. The heat conduction assembly is connected to the current limiting element, the current limiting element comprises a main body part and a fusing part which are connected, the heat conduction assembly comprises a main body heat conduction piece and a fusing heat conduction piece, the main body heat conduction piece is suitable for conducting heat on the main body part, and the fusing heat conduction piece is suitable for conducting heat on the fusing part; the heat conduction coefficient of the main body heat conduction piece is higher than that of the fusing heat conduction piece.

Description

Technical Field

[0001] The present application relates to the field of electrical technology, and in particular to a heat conducting component and a fuse. Background Art

[0002] In a system containing a current limiting element, the main body and the fuse part of the current limiting element have different requirements for thermal conductivity under their respective working conditions. However, as far as the current related technology is concerned, the only way to deal with the different thermal conductivity requirements of the current limiting element is to adjust the structure of the fuse. Summary of the invention

[0003] The purpose of the present application is to provide a heat-conducting component and a fuse, aiming to solve the problem that different parts of a current-limiting element have different requirements for heat-conducting performance.

[0004] In order to achieve the above objectives, this application adopts the following technical solutions:

[0005] In a first aspect, the present application provides a heat-conducting component, which is connected to a current limiting element, the current limiting element includes a main body part and a fuse part connected to each other, the heat-conducting component includes a main body heat-conducting part and a fuse heat-conducting part, the main body heat-conducting part is suitable for conducting heat to the main body part, and the fuse heat-conducting part is suitable for conducting heat to the fuse part; wherein the thermal conductivity coefficient of the main body heat-conducting part is higher than the thermal conductivity coefficient of the fuse heat-conducting part.

[0006] The main body heat conductor has a high thermal conductivity coefficient and can efficiently conduct heat to the main body of the current limiting element. The main body usually requires good heat dissipation performance during operation to ensure its stable operation. The main body heat conductor with high thermal conductivity can quickly conduct the heat generated by the main body to prevent heat accumulation from causing excessive temperature, thereby ensuring the performance and life of the main body of the current limiting element.

[0007] On the other hand, the thermal conductivity of the fusible heat conductor is relatively low, which is suitable for conducting heat to the fusible part. The function of the fusible part is to fuse under certain circumstances to protect the circuit. The low thermal conductivity can prevent the heat from being conducted away too quickly when the fusible part needs to fuse, thereby ensuring that the fusible part can fuse accurately at the right time and play an effective protective role.

[0008] Through this targeted design, the thermal conductive component can meet the different requirements of thermal conductivity of different parts of the current limiting element, which not only ensures the heat dissipation effect of the main part, but also ensures that the fuse part can reliably play a protective function at critical moments, thus improving the safety and stability of the entire circuit system.

[0009] In some embodiments, the difference between the thermal conductivity of the main body thermal conductor and the thermal conductivity of the fuse thermal conductor is greater than or equal to 0 and less than or equal to 8.

[0010] In some embodiments, the difference between the thermal conductivity of the main body thermal conductor and the thermal conductivity of the fuse thermal conductor is greater than or equal to 1 and less than or equal to 7.

[0011] In some embodiments, the difference between the thermal conductivity of the main body thermal conductor and the thermal conductivity of the fuse thermal conductor is greater than or equal to 2 and less than or equal to 6.

[0012] In some embodiments, the thermal conductivity of the fusing thermal conductor is greater than or equal to 3 and less than or equal to 7.

[0013] In some embodiments, the thermal conductivity of the fusing thermal conductor is greater than or equal to 4 and less than or equal to 6.

[0014] In some embodiments, the main heat-conducting component includes a first heat-conducting sub-component disposed at one end of the heat-conducting assembly. The first heat-conducting sub-component is provided with a first avoidance hole, and the first avoidance hole is suitable for allowing the current-limiting element to pass through so as to electrically connect the current-limiting element to the outside.

[0015] In some embodiments, the main heat-conducting component includes a second heat-conducting sub-component disposed at the other end of the heat-conducting component. The second heat-conducting sub-component is provided with a second avoidance hole, and the second avoidance hole is suitable for allowing the current-limiting element to pass through so as to electrically connect the current-limiting element to the outside.

[0016] In some embodiments, the material of the main heat conductor includes first quartz sand; the material of the fuse heat conductor includes second quartz sand.

[0017] According to a second aspect of the present application, a fuse is provided, which includes a current limiting element and a heat-conducting component. The current limiting element includes a main body part and a fuse part connected to each other. The heat-conducting component includes a main body heat-conducting part and a fuse heat-conducting part. The main body heat-conducting part is suitable for conducting heat to the main body part, and the fuse heat-conducting part is suitable for conducting heat to the fuse part. The thermal conductivity coefficient of the main body heat-conducting part is higher than the thermal conductivity coefficient of the fuse heat-conducting part.

[0018] In some embodiments, along a first direction, a cross-sectional area of ​​the main body portion is greater than a cross-sectional area of ​​the fuse portion, and the first direction is perpendicular to an extension direction of the current limiting element.

[0019] In some embodiments, the fuse portion is provided with at least one through hole, and the aperture of the through hole intersects with the extension direction of the current limiting element.

[0020] In some embodiments, the heat conducting component is disposed on the peripheral side of the current limiting element.

[0021] In some embodiments, the number of the main body portion is at least one, and the number of the fuse portion is at least one; the at least one main body portion and the at least one fuse portion are alternately arranged in sequence along the extension direction of the current limiting element.

[0022] In some embodiments, there are multiple main body parts and multiple fuse parts; the multiple main body parts and the multiple fuse parts are alternately arranged in sequence along the extension direction of the current limiting element.

[0023] In some embodiments, along the extension direction of the current limiting element, both end portions of the current limiting element are formed by the main body portion.

[0024] In some embodiments, the fuse further includes a shell, the shell is provided with a containing space, and the heat conducting component and the current limiting element are disposed in the containing space.

[0025] In some embodiments, the heat conducting component is disposed between the current limiting element and the housing.

[0026] In some embodiments, along the extension direction of the current limiting element, a third avoidance hole and a fourth avoidance hole are provided at both ends of the shell, and the third avoidance hole and the fourth avoidance hole are suitable for allowing both ends of the current limiting element to pass through so as to electrically connect the current limiting element to the outside.

[0027] In some embodiments, the fuse also includes a first connecting copper bar and a second connecting copper bar, the first connecting copper bar is arranged in the third avoidance hole, and the first connecting copper bar is suitable for being electrically connected to the current limiting element; the second connecting copper bar is arranged in the fourth avoidance hole, and the second connecting copper bar is suitable for being electrically connected to the current limiting element.

[0028] In some embodiments, the current limiting element is a fuse.

[0029] In some embodiments, the thermally conductive component includes the thermally conductive component described above.

[0030] In some embodiments, the heat-conducting component is heat-conducting particles filled between the current limiting element and the housing.

[0031] It should be noted that the technical effects brought about by the implementation method of the second aspect can refer to the technical effects brought about by the corresponding implementation method in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a fuse provided in some embodiments of the present application;

[0034] Figure 2 It is a schematic diagram of the heat conduction principle in the related technology;

[0035] Figure 3 A schematic diagram of the structure of a fuse provided in some embodiments of the present application.

[0036] Reference numerals:

[0037] 100-current limiting element; 101-main body; 102-fuse part; 1021-through hole;

[0038] 200-heat-conducting component; 201-main heat-conducting component; 2011-first heat-conducting subcomponent; 2012-second heat-conducting subcomponent; 202-fuse heat-conducting component;

[0039] 300-housing; 301-accommodation space; 302-third avoidance hole; 303-fourth avoidance hole;

[0040] 400-first connecting copper bar; 500-second connecting copper bar. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside", etc. indicate directions or positional relationships based on the directions or relative positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional description can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is met.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. It can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, article or device including the element.

[0046] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0047] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0048] A fuse is a safety device used to protect a circuit. It can automatically disconnect the circuit in the event of an overcurrent or short circuit, thereby preventing equipment damage or safety hazards such as fire. The working principle of a fuse is to use the characteristics of molten metal melting at high temperatures. When the current exceeds the set value, the current limiting element 100 inside the fuse will melt due to heat, cutting off the current path.

[0049] Exemplarily, the limiting element is a fuse. The fuse of a fuse is a key component inside the fuse, and is usually a metal wire made of a specific material (such as copper or aluminum). The main function of the fuse is to cut off the circuit according to the change of current.

[0050] When current passes through the fuse, if the current value exceeds the rated value of the fuse, the fuse will quickly heat up due to the heat generated by the current. When the temperature reaches the melting point, the fuse will melt and disconnect, completing the protection of the circuit. This process helps prevent safety hazards such as equipment damage and fire caused by overload or short circuit.

[0051] The fuse usually consists of a main body 101 and a fuse part 102. The main body 101 needs to carry current under normal working conditions. In order to ensure the stable operation of the circuit, its melting point is relatively high so that it will not melt easily under the heat generated by the normal working current. The main function of the fuse part 102 is to quickly melt when an abnormal situation occurs in the circuit to protect the circuit and other electronic components, so its melting point is relatively low. When the heat generated by the abnormal current raises the temperature of the fuse part 102 to its melting point, the fuse part 102 will quickly melt, cut off the circuit, and prevent further damage.

[0052] In the more than 100 years since the birth of fuses, people have designed a wide variety of fuses with different materials, uses and performances, but their basic principles have not changed much. To this day, various types of fuses are still widely used in electrical, electronic systems and new energy industries, becoming a highly reliable protection device to ensure the safety of various high and low voltage electrical and electronic equipment and prevent the expansion of faults.

[0053] Different parts of the current limiting element 100 (such as a fuse) have different requirements for thermal conductivity. For example, when the main body 101 and the fuse part 102 are working, they have different requirements for whether the generated heat needs to be conducted and the corresponding thermal conductivity efficiency.

[0054] For example, see Figure 1 The main body 101 needs to carry current continuously and maintain stable performance under normal working conditions. The higher thermal conductivity can ensure that the heat generated by the main body 101 under normal working current can be quickly dissipated to avoid heat accumulation and excessive temperature, thereby maintaining the main body 101 working stably within a safe temperature range.

[0055] As another example, the main function of the fuse part 102 is to quickly fuse under abnormal current conditions to protect the circuit. The lower thermal conductivity can make the fuse part 102 dissipate heat relatively slowly under the heat generated by the abnormal current, thereby making it easier to concentrate the heat and accelerate the reaching of the fuse temperature.

[0056] For the convenience of subsequent explanation, the professional terms involved in this application are explained here:

[0057] Thermal conductivity, also known as thermal conductivity, refers to the amount of heat transferred through an area of ​​1 square meter in 1 second (1S) when the temperature difference between the two surfaces of a 1 meter thick material is 1 degree (℃) under stable heat transfer conditions. The unit is watt / meter (W / (m·℃)). Thermal conductivity is an indicator to measure the thermal conductivity of a material. It indicates the amount of heat passing through a material per unit area and per unit temperature gradient per unit time, focusing on the efficiency of a material in transferring heat.

[0058] Specific heat capacity, also known as specific heat capacity, or specific heat for short, is the heat capacity of a substance per unit mass, that is, the amount of heat absorbed or released when a unit mass of an object changes unit temperature. The unit is (J / (kg·℃)). Specific heat capacity reflects the ability of a substance to store heat. It describes how much heat a substance per unit mass absorbs or releases when the temperature changes, focusing on the heat capacity characteristics of the substance itself. In the actual heat transfer process, there is a certain mutual influence between specific heat capacity and thermal conductivity.

[0059] Density refers to the mass of a substance per unit volume, represented by the symbol ρ, and the international unit is kilogram per cubic meter (kg / m 3 ). Its calculation formula is: density (ρ) = mass (m) / volume (V). In some cases, the density of a substance may have a certain indirect effect on the thermal conductivity by affecting its microstructure and other factors.

[0060] For a better understanding of the heat transfer process of heat conduction, see Figure 2 ,in, Figure 2 The X direction shown in is the direction of gravity. This application introduces three common heat transfer methods in combination with heat transfer.

[0061] Figure 2 The path shown by line A in the figure is a heat transfer method of heat conduction, which is also the main heat transfer method of the fuse in this application. Heat conduction refers to the process of heat transfer from a high-temperature part to a low-temperature part through a material in direct contact. This heat transfer process relies on the contact between two objects to transfer heat.

[0062] Qt=-λ·A·gradt(1)

[0063] The above formula (1) is a one-dimensional heat conduction formula, where q represents the heat flux density in W / m 2 ; λ is thermal conductivity, unit is W / m·℃; gradt is temperature gradient; Qt is heat flux, unit is W; A is conductor cross-sectional area, unit is m 2 .

[0064] Figure 2 The path shown by line B in the figure is a heat transfer method called thermal convection. Thermal convection is a heat transfer process caused by the relative displacement between the parts of the fluid due to the macroscopic movement of the fluid and the mixing of cold and hot fluids.

[0065] Qc=hc·A·Δt(2)

[0066] The above formula (2) is the convective heat transfer formula, where Qc represents the convective heat dissipation, in W; hc represents the convective heat transfer coefficient, in W / m 2 ℃; A represents the effective heat exchange area, in m2 ; Δt represents the temperature difference between the heat exchange surface and the fluid, in ℃.

[0067] Figure 2 The path shown by line C in the figure is a heat transfer method of thermal radiation, which is a phenomenon in which an object radiates electromagnetic waves due to its temperature.

[0068] QR=A·θ12·ε·σ0(T14-T24)(3)

[0069] The above formula (3) is the heat transfer formula for thermal radiation, where σ0 represents the Stefan Boltzmann constant, σ0 = 5.67 × 10-8 W / (m 2 ·K4); T represents the surface temperature of the object, the temperature is K; QR represents the radiation heat transfer, the unit is W; A represents the surface area of ​​the object for radiation heat transfer, the unit is m 2 ; ε is the emissivity; θ12 represents the angular coefficient between the two objects.

[0070] To solve the above problems, see Figure 1 The present application provides a fuse, which includes a current limiting element 100 and a heat-conducting component 200 . The current limiting element 100 includes a main body portion 101 and a fuse portion 102 connected to each other. The heat-conducting component 200 includes a main body heat-conducting component 201 and a fuse heat-conducting component 202 .

[0071] The main heat-conducting member 201 is suitable for conducting heat to the main part 101 , and the fuse heat-conducting member 202 is suitable for conducting heat to the fuse part 102 , wherein the thermal conductivity of the main heat-conducting member 201 is higher than that of the fuse heat-conducting member 202 .

[0072] In this way, the main body 101 is relatively sensitive to temperature changes due to the high thermal conductivity of the main body heat conductor 201, and can conduct away heat to prevent heat accumulation, and can maintain a low temperature under normal working current. The fuse part 102 is relatively insensitive to temperature changes due to the low thermal conductivity of the fuse heat conductor 202, and will quickly heat up under the high heat generated by the abnormal current, which is conducive to melting.

[0073] The heat-conducting members with different thermal conductivity coefficients conduct heat to the main body portion 101 and the fuse portion 102 respectively, which can better meet the requirements of the current limiting element 100 under different working conditions.

[0074] The main body heat conductor 201 with a high conductivity coefficient ensures the temperature stability of the main body part 101 during normal operation, reducing the risk of malfunction caused by temperature fluctuations.

[0075] At the same time, the low thermal conductivity fuse heat conductor 202 plays a role of precise control in the fusing protection process, making the fusing process more reliable and avoiding the situation of false fusing or untimely fusing.

[0076] The thermal conductivity is an indicator of the thermal conductivity of a material. The larger the value, the faster the material conducts heat. When the thermal conductivity of the main thermal conductive member 201 is higher than that of the fuse thermal conductive member 202, it means that under the same conditions, the main thermal conductive member 201 can transfer heat more quickly than the fuse thermal conductive member 202.

[0077] Exemplarily, the difference between the thermal conductivity of the main body heat conductor 201 and the thermal conductivity of the fuse heat conductor 202 is greater than or equal to 0 and less than or equal to 8.

[0078] Exemplarily, the difference between the thermal conductivity of the main body heat conductor 201 and the thermal conductivity of the fuse heat conductor 202 is greater than or equal to 1 and less than or equal to 7.

[0079] Exemplarily, the difference between the thermal conductivity of the main body heat conductor 201 and the thermal conductivity of the fuse heat conductor 202 is greater than or equal to 2 and less than or equal to 6.

[0080] In some embodiments, the material of the main heat-conducting member 201 includes a first quartz sand, and the material of the fuse heat-conducting member 202 includes a second quartz sand.

[0081] It should be noted that the difference between the first quartz sand and the second quartz sand is that the thermal conductivity coefficients of the two are different, and the thermal conductivity coefficient of the first quartz sand is greater than the thermal conductivity coefficient of the second quartz sand.

[0082] Specifically, the thermal conductivity of quartz sand can be affected by changing the specific heat capacity of quartz sand. For example, the specific heat capacity of quartz sand can be adjusted by adjusting the particle size and shape of quartz sand.

[0083] Exemplarily, the specific heat capacity of the first quartz sand is greater than or equal to 770 (J / (kg·°C)), and the specific heat capacity of the first quartz sand is less than or equal to 830 (J / (kg·°C)). The specific heat capacity of the second quartz sand is greater than or equal to 580 (J / (kg·°C)), and the specific heat capacity of the second quartz sand is less than or equal to 620 (J / (kg·°C)).

[0084] Correspondingly, the thermal conductivity of the first quartz sand is greater than or equal to 8 (w / (m·℃)), and the thermal conductivity of the first quartz sand is less than or equal to 10 (w / (m·℃)). The thermal conductivity of the second quartz sand is greater than or equal to 4 (w / (m·℃)), and the thermal conductivity of the second quartz sand is less than or equal to 6 (w / (m·℃)).

[0085] The density of the first quartz sand may be consistent with or inconsistent with the density of the second quartz sand.

[0086] Exemplarily, the first quartz sand has the same density as the second quartz sand.

[0087] In another exemplary embodiment, the density of the first quartz sand and the second quartz sand is greater than or equal to 2600 (kg / m 3 ), the density of the first quartz sand and the second quartz sand is less than or equal to 2700 (kg / m 3 ).

[0088] Correspondingly, the thermal conductivity coefficients corresponding to the first quartz sand and the second quartz sand are different, the thermal conductivity coefficient of the first quartz sand is greater than or equal to 8 (w / (m·℃)), and the thermal conductivity coefficient of the first quartz sand is less than or equal to 10 (w / (m·℃)).

[0089] The thermal conductivity of the second quartz sand is greater than or equal to 4 (w / (m·°C)), and the thermal conductivity of the second quartz sand is less than or equal to 6 (w / (m·°C)).

[0090] It should be noted that the materials of the main heat-conducting component 201 and the fuse heat-conducting component 202 can be quartz sand, or can be materials with heat-conducting properties such as silicone oil and alumina ceramics.

[0091] Among them, silicone oil has good insulation and heat dissipation properties, and alumina ceramics have high heat resistance and mechanical strength, which can achieve the role played by quartz sand in this application.

[0092] Furthermore, the present application uses the material of the main heat-conducting component 201 and the fuse heat-conducting component 202 both being quartz sand as an example.

[0093] In the present application, the main heat conductive part 201 is made of the first quartz sand, and the fuse heat conductive part 202 is made of the second quartz sand. Due to the different thermal conductivity coefficients of the two, the thermal conductivity of the fuse wire is also different, thereby being able to meet the different thermal conductivity requirements corresponding to the main part 101 and the fuse part 102.

[0094] Furthermore, the quartz sand in the present application can also play some conventional roles in the operation of the fuse.

[0095] For example, when a fuse blows due to overload or short circuit, an arc is generated. The arc is a high-temperature, high-energy discharge phenomenon. If it is not extinguished in time, it may cause damage to the fuse or even cause serious consequences such as electrical fires. Quartz sand can absorb the heat generated by the arc and quickly reduce the arc temperature. At the same time, the quartz sand particles can separate the arc, making it unable to continue to exist, thereby achieving the effect of rapid arc extinguishing.

[0096] As another example, quartz sand can increase the circuit resistance at the moment when the fuse of the fuse melts, limiting the rising speed and peak value of the short-circuit current. This is because the resistance of quartz sand changes under the high temperature of the arc, which can effectively suppress the increase of fault current, avoid excessive impact and damage to other devices in the circuit caused by the fault current, and protect the safety of the entire circuit system.

[0097] The first quartz sand may be consistent with the quartz sand used in conventional fuses. Compared with the first quartz sand, the second quartz sand has poorer thermal conductivity, so that the temperature of the fusing part 102 of the fuse wire is discharged at a slower speed.

[0098] In addition, in terms of mechanical properties, the first quartz sand and the second quartz sand can play an important role. Quartz sand can buffer the vibration of the current limiting element 100 (fuse wire) of the fuse. When the current limiting element 100 (fuse wire) is in working state, it may be affected by various vibrations of the external environment. Quartz sand can effectively absorb and disperse vibration energy by virtue of its own particle structure and physical properties, and reduce the risk of fatigue damage and accidental breakage of the current limiting element 100 (fuse wire) caused by vibration. This ensures that the fuse can operate stably and reliably in various complex working environments, providing a strong guarantee for the safety of the circuit.

[0099] In some embodiments, see Figure 1 The main heat-conducting component 201 includes a first heat-conducting component 2011 disposed at one end of the heat-conducting component 200. The first heat-conducting component 2011 is provided with a first avoidance hole, which is suitable for allowing the current-limiting element 100 to pass through so as to electrically connect the current-limiting element 100 to the outside.

[0100] On the one hand, the first avoidance hole allows the current limiting element 100 to pass through and be electrically connected to the outside world, providing a convenient electrical path. Compared with a structure without avoidance holes, this design avoids the need for additional detours or complex connection methods to achieve electrical connection of the current limiting element 100.

[0101] The current limiting element 100 (such as a fuse) can be directly connected to the external circuit through the first avoidance hole, reducing the length and complexity of the connection line, thereby reducing the possibility of line resistance and signal loss. Just like in a complex circuit board system, a good electrical connection path can ensure stable transmission of signals and currents, which helps to improve the performance and reliability of high-precision electronic equipment.

[0102] On the other hand, the first avoidance hole is opened on the first heat-conducting sub-component 2011 that needs to quickly help the main body 101 to dissipate heat, and the heat conduction path is optimized. The existence of the first avoidance hole will change the path of heat conduction inside the first heat-conducting sub-component 2011, and the heat will form a new conduction path at the edge of the first avoidance hole, which is similar to opening some "branches" on an originally continuous heat conduction "channel". These branches can guide the heat to diffuse more efficiently inside the first heat-conducting sub-component 2011, so that the heat can be conducted from the fuse to other parts of the first heat-conducting sub-component 2011 more quickly, thereby accelerating the heat dissipation.

[0103] At the same time, the first avoidance hole provides space for air flow. The heat generated by the fuse when working raises the temperature of the surrounding air, forming heat convection. Just like the principle of a chimney, the first avoidance hole plays a similar role as a chimney, allowing hot air to be discharged more smoothly and cold air to enter more timely, thereby taking away more heat and allowing the fuse to dissipate heat faster.

[0104] The first avoidance hole also increases the effective radiation surface area of ​​the first heat-conducting sub-component 2011, so that the first heat-conducting sub-component 2011 can dissipate heat with a larger radiation area. Moreover, after the heat is transferred from the fuse to the first heat-conducting sub-component 2011, the first avoidance hole changes the direction and distribution of the heat radiation, so that more heat can be effectively radiated to the surrounding space, thereby accelerating the heat dissipation of the fuse.

[0105] Correspondingly, in some embodiments, see Figure 1 The main heat-conducting component 201 includes a second heat-conducting component 2012 arranged at the other end of the heat-conducting component 200. The second heat-conducting component 2012 is provided with a second avoidance hole, which is suitable for allowing the current limiting element 100 to pass through so as to electrically connect the current limiting element 100 to the outside.

[0106] The role of the second avoidance hole can be seen with reference to the first avoidance hole, and will not be repeated here.

[0107] It should be further explained that, with respect to the current limiting element 100 , the two end portions of the current limiting element 100 along the extension direction of the current limiting element 100 are both formed by the main body 101 .

[0108] When both ends of the current limiting element 100 are formed by the main body 101, the current limiting element 100 and the main body 101 become a more compact whole from a structural point of view. This is like a bridge, where the bridge body (current limiting element 100) and the bridge pier (main body 101) are closely connected without gaps or weak connections, so that the entire device can better maintain structural integrity when facing external mechanical shocks, vibrations, etc.

[0109] At the same time, the melting points of the main parts 101 at both ends are relatively high. When the current is relatively large, the fuse part 102 will melt, but the main part 101 will not melt. This means that the two ends of the entire fuse connected to the outside world will not produce arcing caused by melting. At the same time, with the main heat conductor 201, the main parts 101 at both ends will not have dangerous situations such as excessive heat.

[0110] Therefore, even if the fuse element is blown, the fuse will not affect the connected components when the circuit is disconnected.

[0111] In some embodiments, see Figure 1 Along the first direction, the cross-sectional area of ​​the main body portion 101 is greater than the cross-sectional area of ​​the fuse portion 102 , and the first direction is perpendicular to the extension direction of the current limiting element 100 .

[0112] Exemplarily, the current limiting element 100 is a cylindrical fuse.

[0113] In another exemplary embodiment, the current limiting element 100 is a sheet-shaped fuse.

[0114] In some embodiments, see Figure 3 The fuse portion 102 is provided with at least one through hole 1021 , and the aperture of the through hole 1021 intersects with the extension direction of the current limiting element 100 .

[0115] Exemplarily, the aperture of the through hole 1021 is perpendicular to the extension direction of the current limiting element 100 .

[0116] On the one hand, from the perspective of heat dissipation, this design provides a channel for air flow, allowing hot air to rise and dissipate through the through hole 1021, while cold air can be replenished, thereby enhancing heat convection and effectively reducing the temperature of the fuse part 102, preventing overheating from affecting the performance of the fuse or causing safety problems.

[0117] On the other hand, the presence of the through hole 1021 also increases the surface area of ​​the fuse portion 102, which helps to dissipate heat more quickly in the form of thermal radiation, further improving the heat dissipation effect.

[0118] Moreover, in terms of arc suppression, when an arc is generated at the moment the fuse melts, these through holes 1021 can divide the path of the arc. Since air is usually an insulator, the through holes 1021 can hinder the continuous propagation of the arc, reduce the energy density of the arc, and reduce the damage of the arc to surrounding circuit elements, making the fusing process smoother and safer.

[0119] In some embodiments, see Figure 1 The heat conducting component 200 is disposed on the peripheral side of the current limiting element 100 .

[0120] When the current limiting element 100 generates heat during operation, the heat conducting component 200 can quickly and effectively conduct the heat away by virtue of its large contact area, thereby preventing the current limiting element 100 from being overheated and damaged. At the same time, the heat conducting component 200 surrounding the periphery can also dissipate the heat evenly, thereby preventing local overheating and ensuring that the temperature of each part of the current limiting element 100 is relatively uniform, thereby improving its working stability and service life.

[0121] In some embodiments, see Figure 1 Combined with Figure 3 The number of the main body portion 101 is at least one, and the number of the fuse portion 102 is at least one; at least one main body portion 101 and at least one fuse portion 102 are alternately arranged in sequence along the extension direction of the current limiting element 100.

[0122] Further, see Figure 1 Combined with Figure 3 The number of the main body parts 101 is multiple, and the number of the fuse parts 102 is at least multiple; the multiple main body parts 101 and the multiple fuse parts 102 are alternately arranged in sequence along the extension direction of the current limiting element 100.

[0123] By alternately arranging at least one main body portion 101 and at least one fuse portion 102 in sequence along the extension direction of the current limiting element 100 , the fusing process can be controlled more accurately.

[0124] When an abnormal situation such as overload or short circuit occurs in the circuit, the fuse part 102 can work according to the designed fuse characteristics.

[0125] Since the distribution of the fuse part 102 is regular and cooperates with the main part 101, the fusing can occur under predetermined current and time conditions. This is like setting multiple "fuses" in the process of circuit protection, which can more accurately protect the circuit in sections. Once a fuse part 102 is blown, the fault current path can be effectively cut off.

[0126] In addition, the alternating arrangement of the main body 101 and the fuse part 102 is conducive to reducing the impact of contact resistance on electrical performance. In a circuit, contact resistance may cause energy loss and local heating. This alternating arrangement ensures that when the current passes through the current limiting element 100, it will not be excessively hindered by a certain high contact resistance area. Because the main body 101 can serve as a good conductive channel and work in conjunction with the fuse part 102 to ensure that the current can pass more smoothly, thereby improving the electrical efficiency of the entire current limiting element 100 and reducing the loss of electrical energy.

[0127] It should be noted that the alternating arrangement here can be expressed as alternating multiple main parts 101 and one fuse part 102, alternating main parts 101 and fuse parts 102 one by one, alternating one main part 101 and multiple fuse parts 102, and alternating multiple main parts 101 and multiple fuse parts 102. The present application does not limit this.

[0128] In some embodiments, see Figure 1 Combined with Figure 3 The fuse includes a housing 300 , the housing 300 is provided with a containing space 301 , and the heat conducting component 200 and the current limiting element 100 are disposed in the containing space 301 .

[0129] In this way, due to the provision of the housing 300 and the accommodating space 301, the fuse can effectively resist moisture and dust, so that the components in the accommodating space 301 can work in a clean environment, thereby extending the service life of the components.

[0130] In some embodiments, see Figure 1 Combined with Figure 3 The heat conducting component 200 is disposed between the current limiting element 100 and the housing 300 .

[0131] For example, the heat-conducting assembly 200 provided in the present application may be a plurality of molded block structures, and the block structures are arranged on the side periphery of the fuse.

[0132] Specifically, the heat-conducting block structure is disposed between the fuse and the housing 300 .

[0133] In another exemplary embodiment, the heat-conducting component 200 is heat-conducting particles filled between the current limiting element 100 and the housing 300. That is, the heat-conducting particles are filled between the current limiting element 100 and the housing 300 to form a structure similar to a "filler". This filling method can make full use of the space, so that the heat-conducting particles can closely contact the current limiting element 100 and the housing 300, ensuring that heat can be effectively transferred between the two.

[0134] At this time, the housing 300 also provides a closed space for the heat-conducting particles, so that the particles can be confined in a certain area, and at the same time, the particles can be effectively prevented from leaking into the external environment.

[0135] In some embodiments, see Figure 1 Combined with Figure 3 In order to enable the current limiting element 100 (fuse) to be electrically connected to the outside world, a third avoidance hole 302 and a fourth avoidance hole 303 are provided at both ends of the housing 300 along the extension direction of the current limiting element 100. The third avoidance hole 302 and the fourth avoidance hole 303 are suitable for allowing the two ends of the current limiting element 100 to pass through so as to electrically connect the current limiting element 100 to the outside world.

[0136] In some embodiments, see Figure 1 Combined with Figure 3 The fuse also includes a first connecting copper bar 400 and a second connecting copper bar 500. The first connecting copper bar 400 is arranged in the third avoidance hole 302, and the first connecting copper bar 400 is suitable for being electrically connected to the current limiting element 100. The second connecting copper bar 500 is arranged in the fourth avoidance hole 303, and the second connecting copper bar 500 is suitable for being electrically connected to the current limiting element 100.

[0137] On the one hand, the first copper bar 400 and the second copper bar 500 have good electrical conductivity, which can ensure that the current is efficiently transmitted between the fuse and the external circuit, reducing the loss of electric energy in the connection part. The arrangement of the first copper bar 400 and the second copper bar 500 provides a stable and reliable electrical connection for the current limiting element 100, so that the current limiting element 100 can better play its current limiting protection role in the circuit.

[0138] Secondly, the design of the third avoidance hole 302 and the fourth avoidance hole 303 makes the installation of the first connecting copper bar 400 and the second connecting copper bar 500 more reasonable and compact, avoiding excessive space occupation due to unreasonable connection structure, which is conducive to the miniaturization and integration of the overall structure of the fuse.

[0139] Furthermore, this connection method is convenient for installation and maintenance. When the fuse needs to be repaired or replaced, it can be easily operated by connecting the copper busbar, thereby improving work efficiency.

[0140] Finally, the first connecting copper bar 400 and the second connecting copper bar 500 usually have high mechanical strength and stability, and can withstand certain external forces and vibrations, ensuring that the connection between the fuse and the external circuit is always reliable under various working environments, thereby improving the overall reliability and durability of the fuse.

[0141] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A heat conducting component (200), connected to a current limiting element (100), wherein the current limiting element (100) comprises a main body portion (101) and a fuse portion (101) connected to each other, characterized in that: The heat conducting component (200) comprises: A main body heat conducting member (201), adapted to conduct heat to the main body portion (101); A fusing heat-conducting member (202) adapted to conduct heat to the fusing portion (101); The thermal conductivity coefficient of the main body heat conducting component (201) is higher than the thermal conductivity coefficient of the fuse heat conducting component (202).

2. The heat conducting component (200) according to claim 1, characterized in that: The difference between the thermal conductivity coefficient of the main body heat conducting component (201) and the thermal conductivity coefficient of the fuse heat conducting component (202) is greater than or equal to 0 and less than or equal to 8.

3. The heat conducting component (200) according to claim 1, characterized in that: The difference between the thermal conductivity coefficient of the main body heat conducting component (201) and the thermal conductivity coefficient of the fuse heat conducting component (202) is greater than or equal to 1 and less than or equal to 7.

4. The heat conducting component (200) according to claim 1, characterized in that: The difference between the thermal conductivity coefficient of the main body heat conducting component (201) and the thermal conductivity coefficient of the fuse heat conducting component (202) is greater than or equal to 2 and less than or equal to 6.

5. The heat conducting component (200) according to claim 1, characterized in that: The thermal conductivity coefficient of the fusing heat-conducting component (202) is greater than or equal to 3 and less than or equal to 7.

6. The heat conducting component (200) according to claim 1, characterized in that: The thermal conductivity coefficient of the fusing heat-conducting component (202) is greater than or equal to 4 and less than or equal to 6.

7. The heat conducting component (200) according to any one of claims 1 to 6, characterized in that: The main heat-conducting component (201) comprises a first heat-conducting sub-component (2011) arranged at one end of the heat-conducting component (200), the first heat-conducting sub-component (2011) being provided with a first avoidance hole, the first avoidance hole being suitable for allowing the current-limiting element (100) to pass through so as to electrically connect the current-limiting element (100) to the outside.

8. The heat conducting component (200) according to claim 7, characterized in that: The main heat-conducting component (201) comprises a second heat-conducting subcomponent (2012) arranged at the other end of the heat-conducting component (200), the second heat-conducting subcomponent (2012) being provided with a second avoidance hole, the second avoidance hole being suitable for allowing the current-limiting element (100) to pass through so as to electrically connect the current-limiting element (100) to the outside.

9. The heat conducting component (200) according to any one of claims 1 to 6, characterized in that: The material of the main heat-conducting component (201) includes first quartz sand; the material of the fuse heat-conducting component (202) includes second quartz sand.

10. A fuse, characterized in that: include: A current limiting element (100), the current limiting element (100) comprising a main body portion (101) and a fuse portion (101) connected to each other; A heat conducting component (200), the heat conducting component (200) comprising: A main body heat conducting member (201), adapted to conduct heat to the main body portion (101); A fusing heat-conducting member (202) adapted to conduct heat to the fusing portion (101); The thermal conductivity coefficient of the main body heat conducting component (201) is higher than the thermal conductivity coefficient of the fuse heat conducting component (202).

11. The fuse according to claim 10, characterized in that: Along a first direction, the cross-sectional area of ​​the main body portion (101) is greater than the cross-sectional area of ​​the fuse portion (101), and the first direction is perpendicular to the extension direction of the current limiting element (100).

12. The fuse according to claim 10, characterized in that The fuse portion (101) is provided with at least one through hole (1021), and the aperture of the through hole (1021) intersects with the extension direction of the current limiting element (100).

13. The fuse according to claim 10, characterized in that The heat conducting component (200) is arranged on the peripheral side of the current limiting element (100).

14. The fuse according to claim 10, characterized in that The number of the main body part (101) is at least one, and the number of the fuse part (101) is at least one; at least one main body part (101) and at least one fuse part (101) are alternately arranged in sequence along the extension direction of the current limiting element (100).

15. The fuse according to claim 10, characterized in that The number of the main body parts (101) is multiple, and the number of the fuse parts (101) is multiple; the multiple main body parts (101) and the multiple fuse parts (101) are alternately arranged in sequence along the extension direction of the current limiting element (100).

16. The fuse according to claim 10, characterized in that Along the extension direction of the current limiting element (100), both end portions of the current limiting element (100) are formed by the main body portion (101).

17. The fuse according to claim 10, characterized in that: include: The housing (300) is provided with a housing space (301), and the heat conducting component (200) and the current limiting element (100) are arranged in the housing space (301).

18. The fuse according to claim 17, characterized in that The heat conducting component (200) is arranged between the current limiting element (100) and the housing (300).

19. The fuse according to claim 17, characterized in that: Along the extension direction of the current limiting element (100), two ends of the housing (300) are provided with a third avoidance hole (302) and a fourth avoidance hole (303), and the third avoidance hole (302) and the fourth avoidance hole (303) are suitable for allowing the two ends of the current limiting element (100) to pass through so as to electrically connect the current limiting element (100) to the outside.

20. The fuse according to claim 19, characterized in that Also includes: A first connecting copper bar (400), wherein the first connecting copper bar (400) is disposed in the third avoidance hole (302), and the first connecting copper bar (400) is suitable for being electrically connected to the current limiting element (100); A second connecting copper bar (500), wherein the second connecting copper bar (500) is arranged in the fourth avoidance hole (303), and the second connecting copper bar (500) is suitable for being electrically connected to the current limiting element (100).

21. The fuse according to any one of claims 10 to 20, characterized in that: The current limiting element (100) is a fuse.

22. The fuse according to any one of claims 17 to 20, characterized in that: The heat-conducting component (200) comprises the heat-conducting component (200) according to any one of claims 1 to 9.

23. The fuse according to any one of claims 17 to 20, characterized in that: The heat-conducting component (200) is heat-conducting particles filled between the current-limiting element (100) and the housing (300).

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