A shunt

Abstract

The utility model belongs to electrical instrument technical field, especially relate to a shunt, including resistance sheet and the copper bar of connection in resistance sheet both ends department, still include: the insulating protective cover, its inside hollow forms and has the heat dissipation cavity, resistance sheet is located in the heat dissipation cavity, is provided with the corresponding avoidance mouth with two copper bars on the both sides cover wall of insulating protective cover, so that the copper bar extends to the outside of insulating protective cover, the heat dissipation fan, the side cover wall of insulating protective cover is equipped with the vent, and the cover wall of insulating protective cover away from the vent is equipped with the air outlet structure, wherein, the vent, the heat dissipation cavity and the air outlet structure form the air guide channel of guiding airflow direction, and the heat dissipation fan is installed on the vent, the beneficial effects of the utility model are: the vent, the heat dissipation cavity and the air outlet structure form the directional air guide channel together, cooperate the forced air supply of heat dissipation fan, drive airflow to flow through the surface of resistance sheet along the air guide channel in order, and the joule heat produced by resistance sheet can be taken away quickly, can improve the heat dissipation efficiency greatly.

Description

Technical Field

[0001] This utility model relates to the field of electrical instrumentation technology, and in particular to a shunt. Background Technology

[0002] Shunts are core components in high-current detection and power metering systems, and are widely used in electrical metering scenarios such as charging piles, industrial power distribution, and smart meters. They are connected in series to the circuit under test and collect the voltage drop signal across the resistive element to achieve high-current measurement and power metering.

[0003] Existing shunts mainly consist of resistive elements and copper busbars fixedly connected to both ends of the resistive elements. During operation, the resistive elements generate Joule heat as current flows through them. The main heat dissipation method is natural air convection, but the efficiency of natural convection is limited. Under continuous operation with high current, the temperature rise of the resistive elements is significant. When the operating temperature of the resistive elements exceeds 80°C, the resistance value of the resistive element will experience significant temperature drift, directly causing a decrease in the accuracy of power metering, and also increasing the additional operating energy consumption of the circuit. Secondly, long-term high-temperature operation will accelerate the aging of the resistors and copper busbars themselves, and the heat will be conducted to the upstream and downstream connected electrical devices through the copper busbars, accelerating the decay rate of surrounding components, shortening the overall service life of the product, and reducing the stability and reliability of the system operation. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a shunt to solve the above problems.

[0005] The technical solution of this utility model is implemented as follows: A shunt includes a resistor element and copper busbars connected to both ends of the resistor element, and further includes: An insulating protective cover has a hollow interior forming a heat dissipation cavity. The resistor is located inside the heat dissipation cavity. The two side walls of the insulating protective cover are provided with clearance openings corresponding to the two copper busbars, so that the copper busbars can extend to the outside of the insulating protective cover. Cooling fan; The insulating protective cover has a ventilation opening on one side of its wall and an air outlet structure on the side of its wall away from the ventilation opening. The ventilation opening, heat dissipation cavity, and air outlet structure form a guide channel to direct the airflow. The cooling fan is installed on the ventilation opening to rotate and disturb the airflow, causing the airflow to flow along the guide channel.

[0006] Furthermore, the heat dissipation cavity includes: The upper heat dissipation gap is formed by the interval between the upper end of the resistor and the upper end of the inner part of the insulating protective cover. The lower heat dissipation gap is formed by the lower end of the resistor and the lower end of the inner part of the insulating protective cover. Lateral current guide gap: The gap between the front and rear sides of the resistor and the front and rear sides inside the insulating protective cover forms a lateral current guide gap. The upper heat dissipation gap is connected to the lower heat dissipation gap through a lateral airflow guide gap.

[0007] Furthermore, the cooling fan is fixed to the upper end of the insulating protective cover with screws, and the ventilation port is an upper air inlet located on the upper end of the insulating protective cover opposite to the cooling fan.

[0008] Furthermore, the insulating protective cover includes; The upper cover is located above the resistor element; The lower cover is located below the resistor element, and the upper cover and the lower cover are aligned with each other; The upper and lower covers together form a heat dissipation cavity; The upper cover and the lower cover are respectively provided with an upper clearance groove and a lower clearance groove on their mating surfaces. The upper clearance groove and the lower clearance groove opposite to it together form a clearance opening.

[0009] Furthermore, the air outlet structure includes: The ventilation windows are located on the upper edges of the front and rear sides of the upper cover. The lower ventilation windows are located on the lower edges of the front and rear sides of the lower cover. The two upper ventilation windows are connected to the upper heat dissipation gap, and the two lower ventilation windows are connected to the lower heat dissipation gap.

[0010] Furthermore, threaded mounting holes are provided on both sides of the lower end of the upper cover, and countersunk receiving grooves are provided at the openings of the threaded mounting holes; Each of the two copper busbars has a through hole corresponding to one of the two threaded mounting holes. The upper part of the lower cover has two through holes on both sides that are integrally connected to the countersunk receiving grooves. A through hole is provided axially inside the protrusion, which extends vertically through the lower cover. Among them, a countersunk receiving groove is provided at the lower opening of the through hole; Through holes one and two are coaxially aligned with the threaded mounting holes, allowing external fastening screws to be screwed into the threaded mounting holes through through holes one and two.

[0011] Furthermore, current terminal holes and voltage measurement terminal holes are respectively opened on the copper busbar; The voltage measurement terminal hole is located inside the heat dissipation cavity, and the hole wall of the voltage measurement terminal hole is provided with internal threads. A wire clamping screw is installed at the lower opening of the voltage measurement terminal hole, and a wiring clearance groove that mates with the wire clamping screw is opened at the lower end of the lower cover.

[0012] Furthermore, the bronze busbar is a purple-gold bronze busbar.

[0013] The beneficial effects of this utility model are as follows: The vents, heat dissipation cavity, and air outlet structure together form a directional airflow channel. Combined with the forced airflow from the cooling fan, this drives the airflow along the channel, flowing orderly across the surface of the resistor element and quickly removing the Joule heat generated by the resistor. Compared to traditional natural heat dissipation structures, this significantly improves heat dissipation efficiency, effectively suppresses the operating temperature rise of the resistor element, ensures stable operation of the resistor element within the precise measurement temperature range, and reduces measurement errors and additional energy consumption caused by resistance temperature drift. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the shunt structure according to a specific embodiment of the present invention; Figure 2 An explosion of the diverter in a specific embodiment of this utility model. Figure 1 ; Figure 3 An explosion of the diverter in a specific embodiment of this utility model. Figure 2 Resistors and copper busbars are not included. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0018] Example 1:

[0019] like Figures 1 to 3 As shown, this utility model discloses a shunt, including a resistor 1 and copper busbars 2 connected to the two ends of the resistor 1, and further including: The insulating protective cover 3 has a hollow interior forming a heat dissipation cavity. The resistor 1 is located inside the heat dissipation cavity. The two side walls of the insulating protective cover 3 are provided with clearance openings corresponding to the two copper busbars 2, so that the copper busbars 2 can extend to the outside of the insulating protective cover 3. Cooling fan 4; Among them, a ventilation opening 5 is provided on one side wall of the insulating protective cover 3, and an air outlet structure is provided on the wall of the insulating protective cover 3 away from the ventilation opening 5. Among them, the vent 5, the heat dissipation cavity and the air outlet structure form a guide channel to guide the airflow direction. The cooling fan 4 is installed on the vent 5 to rotate and disturb the airflow so that the airflow flows along the guide channel. In the above technical solution, the cooling fan consists of fan blades, a drive motor and a support frame, and is powered by an external power supply line connected to the drive motor, which is a mature existing technology. By adopting the above technical solution, the vents, heat dissipation cavity, and air outlet structure together form a directional airflow channel. Combined with the forced airflow from the cooling fan, the airflow is driven to flow orderly along the channel across the surface of the resistor element, quickly removing the Joule heat generated by the resistor element. Compared to traditional natural heat dissipation structures, this significantly improves heat dissipation efficiency, effectively suppresses the operating temperature rise of the resistor element, ensures stable operation of the resistor element within the precise measurement temperature range, and reduces measurement errors and additional energy consumption caused by resistance temperature drift. The forced air cooling structure can drive the surrounding air circulation, which not only cools the distributor itself, but also plays an auxiliary role in cooling the electrical components connected upstream and downstream, slowing down the aging speed of the components throughout the entire chain and extending the overall service life of the system. The insulating protective cover has clearance openings on both sides for the copper busbars to extend out, which achieves insulation protection and heat dissipation functions without affecting the circuit connection and installation of the shunt. The hollow insulating protective cover houses the resistor element within the heat dissipation cavity. This provides physical insulation protection for the charged resistor element, enhances the electrical safety performance of the product, and creates a heat dissipation space to prevent disordered airflow and ensure efficient heat exchange.

[0020] Example 2:

[0021] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0022] Furthermore, the heat dissipation cavity includes: The upper heat dissipation gap is formed between the upper end of the resistor 1 and the upper end of the inner part of the insulating protective cover 3. The lower heat dissipation gap is formed by the lower end of the resistor 1 and the lower end of the inner part of the insulating protective cover 3. Lateral current guide gap: The gap between the front and rear sides of the resistor 1 and the front and rear sides of the inner side of the insulating protective cover 3 forms a lateral current guide gap. The upper heat dissipation gap is connected to the lower heat dissipation gap through a lateral airflow guide gap.

[0023] By adopting the above technical solution, the heat dissipation cavity is divided into an upper heat dissipation gap, a lower heat dissipation gap, and two side lateral flow guide gaps that are interconnected, so that the airflow entering the cavity simultaneously covers the upper end face, lower end face, and front and rear sides of the resistor sheet, thereby achieving a surround heat exchange on the entire surface of the resistor sheet and eliminating heat dissipation dead zones. The multi-gap interconnected flow channel structure extends the heat exchange path and contact time between the airflow and the resistor, improves the fullness of heat exchange, further reduces the overall temperature rise of the resistor, and improves the temperature uniformity of the resistor.

[0024] Example 3:

[0025] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0026] Furthermore, the cooling fan 4 is fixed to the upper end of the insulating protective cover 3 with screws, and the vent 5 is an upper air inlet opened on the upper end of the insulating protective cover 3 opposite to the cooling fan 4.

[0027] By adopting the above technical solution, the cooling fan is installed on the upper part of the insulating protective cover, and the ventilation port adopts the layout of upper air intake. The airflow flows from top to bottom through the resistor plate, which conforms to the physical characteristics of hot air naturally rising. With the fan driving force, the heat can be accelerated to be discharged to the outside of the cavity, improving the overall heat dissipation efficiency. The cooling fan is fixed with screws, ensuring a secure and reliable connection. It is also easy to disassemble and assemble, facilitating future maintenance, cleaning, or replacement of the fan.

[0028] Example 4:

[0029] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0030] Furthermore, the insulating protective cover 3 includes; The upper cover 31 is located above the resistor 1; The lower cover 32 is located below the resistor 1, and the upper cover 31 and the lower cover 32 are aligned with each other; The upper cover 31 and the lower cover 32 together form a heat dissipation cavity; The upper cover 31 and the lower cover 32 are respectively provided with an upper clearance groove and a lower clearance groove on their mating surfaces. The upper clearance groove and the lower clearance groove opposite to it together form a clearance opening.

[0031] By adopting the above technical solution, the insulating protective cover adopts a split structure with the upper cover and the lower cover fitting together. During production and assembly, the resistor sheet and copper busbar assembly can be placed in place first, and then the cover can be closed and fixed, which greatly reduces the assembly difficulty of the internal components and improves the production and assembly efficiency. The mating surfaces of the upper and lower covers are respectively provided with clearance grooves, which naturally enclose the copper busbar clearance opening after mating. The mold forming process is simple, and at the same time it can limit the copper busbar to ensure the assembly position accuracy.

[0032] Example 5:

[0033] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0034] Furthermore, the air outlet structure includes: The upper ventilation windows are located on the upper edges of the front and rear sides of the upper cover 31. The lower ventilation window is located on the lower edge of the front and rear sides of the lower cover 32; The two upper ventilation windows are connected to the upper heat dissipation gap, and the two lower ventilation windows are connected to the lower heat dissipation gap.

[0035] In the above technical solution, in addition to the upper air intake, the cooling fan can also be installed on the side wall of the insulating protective cover, and the upper and lower ventilation windows are located on the other side of the insulating protective cover away from the cooling fan. The side air intake, the heat dissipation cavity and the air outlet structure together form a horizontal airflow channel, which greatly improves the installation compatibility and scenario adaptability of the product. By adopting the above technical solution, the upper ventilation window is connected to the upper heat dissipation gap, and the lower ventilation window is connected to the lower heat dissipation gap. The front and rear side walls are spatially far away from the top ventilation opening. The airflow flowing through the upper and lower areas of the resistor can be directly discharged through the front and rear ventilation windows, shortening the exhaust path, reducing the wind resistance of the air duct, and improving the airflow circulation speed and heat dissipation efficiency. The symmetrical ventilation windows on both the front and back sides make the airflow distribution inside the cavity more uniform, avoid heat accumulation in local areas of the resistor, ensure the overall temperature consistency of the resistor, and further improve the measurement stability.

[0036] Example 6:

[0037] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0038] Furthermore, threaded mounting holes are provided on both sides of the lower end of the upper cover 31, and countersunk receiving grooves are provided at the openings of the threaded mounting holes; Two through holes 34 corresponding to two threaded mounting holes are respectively opened on the two copper busbars 2; The upper sides of the lower cover 32 are integrally connected to two through holes 34 and countersunk receiving grooves, forming a protrusion. The protrusion has a through hole 33 that runs vertically through the lower cover body along the axial direction. Among them, the lower opening of the through hole 33 is provided with a countersunk receiving groove 2; Through holes 1 (33) and 2 (34) are coaxially aligned with the threaded mounting holes, allowing external fastening screws to be screwed into the threaded mounting holes through through holes 1 (33) and 2 (34).

[0039] By adopting the above technical solution, through hole one and through hole two are coaxially corresponding with the threaded mounting hole. The fastening connection of the lower cover, copper busbar and upper cover can be completed simultaneously by a single set of fastening screws, reducing the number of fasteners and simplifying the assembly process. This connection structure clamps and fixes the copper busbar between the upper and lower covers, improving the overall structural strength and vibration resistance of the shunt. It can prevent stress fatigue failure of the resistor sheet weld caused by the copper busbar shaking due to external force, thus improving the long-term reliability of the product. The protrusion simultaneously penetrates the copper busbar through hole and inserts into the countersunk receiving groove of the upper cover, realizing the radial automatic centering of the three parts, ensuring the coaxiality of the hole positions, avoiding assembly misalignment, and improving assembly efficiency and product consistency. The protrusion can directly withstand the transverse shear force, which greatly reduces the radial load on the fastening screw, prevents the screw from failing due to shear bending, and improves the product's vibration and impact resistance.

[0040] Example 7:

[0041] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0042] Furthermore, the copper busbar 2 is provided with a current terminal hole 21 and a voltage measurement terminal hole 22 respectively; The voltage measurement terminal hole 22 is located inside the heat dissipation cavity, and the hole wall of the voltage measurement terminal hole 22 is provided with internal threads. A wire clamping screw 23 is installed at the lower opening of the voltage measurement terminal hole 22, and a wiring clearance groove 24 that mates with the wire clamping screw 23 is provided at the lower end of the lower cover 32.

[0043] By adopting the above technical solution, current terminal holes and voltage measurement terminal holes are integrated on the copper busbar, which respectively meet the functional requirements of high current input to the main circuit and voltage sampling and measurement. The structure has a high degree of integration and no additional sampling terminals are required. The voltage measurement terminal hole is located inside the heat dissipation cavity, which can be used to simultaneously cool the voltage sampling terminal with the heat dissipation airflow inside the cavity, reducing the impact of terminal temperature rise on the accuracy of sampling signal and ensuring measurement accuracy. The voltage measurement terminal hole is equipped with an internal thread and a wire clamping screw, ensuring reliable wiring connection and easy operation. The lower cover is equipped with a wiring clearance groove, which allows for the removal and installation of the wire clamping screws and wiring operations without disassembling the protective cover, greatly improving the convenience of on-site wiring and subsequent maintenance.

[0044] Example 8:

[0045] This embodiment provides a splitter, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] Furthermore, copper bar 2 is a purple-gold copper bar.

[0047] By adopting the above technical solution and using purple gold copper to make copper busbars, the conductivity is high and the current carrying capacity is strong, which can effectively reduce the conduction resistance of the copper busbars themselves and reduce the additional heat generation and energy loss during the current carrying process.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shunt, comprising a resistor (1) and copper busbars (2) connected to both ends of the resistor (1), characterized in that, Also includes: An insulating protective cover (3) has a hollow interior forming a heat dissipation cavity. A resistor (1) is located inside the heat dissipation cavity. The two sides of the insulating protective cover (3) are provided with clearance openings corresponding to the two copper busbars (2) so that the copper busbars (2) can extend to the outside of the insulating protective cover (3). Cooling fan (4); Among them, a ventilation opening (5) is provided on one side of the insulating protective cover (3), and an air outlet structure is provided on the side of the insulating protective cover (3) away from the ventilation opening (5); Among them, the vent (5), the heat dissipation cavity and the air outlet structure form a guide channel to guide the airflow direction. The cooling fan (4) is installed on the vent (5) to rotate and disturb the airflow so that the airflow flows along the guide channel.

2. A shunt according to claim 1, characterized in that, The heat dissipation cavity includes: The upper heat dissipation gap is formed between the upper end of the resistor (1) and the upper end of the inner part of the insulating protective cover (3); The lower heat dissipation gap is formed by the lower end of the resistor (1) and the lower end of the inner part of the insulating protective cover (3); Lateral flow guide gap: The gap between the front and rear sides of the resistor (1) and the front and rear sides inside the insulating protective cover (3) forms a lateral flow guide gap. The upper heat dissipation gap is connected to the lower heat dissipation gap through a lateral airflow guide gap.

3. A shunt according to claim 2, characterized in that, The cooling fan (4) is fixed to the upper end of the insulating protective cover (3) by screws, and the vent (5) is an upper air inlet opened on the upper end of the insulating protective cover (3) opposite to the cooling fan (4).

4. A shunt according to claim 3, characterized in that, The insulating protective cover (3) includes: The upper cover (31) is located above the resistor (1); The lower cover (32) is located below the resistor (1), and the upper cover (31) and the lower cover (32) are aligned with each other; The upper cover (31) and the lower cover (32) together form a heat dissipation cavity; Among them, the mating surfaces of the upper cover (31) and the lower cover (32) are respectively provided with an upper clearance groove and a lower clearance groove, and the upper clearance groove and its opposite lower clearance groove together form a clearance opening.

5. A shunt according to claim 4, characterized in that, The air outlet structure includes: The upper ventilation window is located on the upper edge of the front and rear sides of the upper cover (31); The lower ventilation window is located on the lower edge of the front and rear sides of the lower cover (32); The two upper ventilation windows are connected to the upper heat dissipation gap, and the two lower ventilation windows are connected to the lower heat dissipation gap.

6. A shunt according to claim 4, characterized in that, The upper cover (31) has threaded mounting holes on both sides of its lower end, and the opening of the threaded mounting holes has a countersunk receiving groove. Two through holes (34) are respectively opened on the two copper busbars (2) to correspond to the two threaded mounting holes; The upper sides of the lower cover (32) are integrally connected to two through holes (34) and countersunk receiving grooves, forming a protrusion. A through hole (33) is provided axially through the protrusion, which extends vertically through the lower cover. Among them, the lower opening of the through hole 1 (33) is provided with a countersunk receiving groove 2; Through hole one (33) and through hole two (34) are coaxially corresponding to the threaded mounting hole, so that external fastening screws can be screwed into the threaded mounting hole through through hole one (33) and through hole two (34).

7. A shunt according to claim 4, characterized in that, The copper busbar (2) is provided with a current terminal hole (21) and a voltage measurement terminal hole (22). Among them, the voltage measurement terminal hole (22) is located in the heat dissipation cavity, and the hole wall of the voltage measurement terminal hole (22) is provided with internal thread; A wire clamping screw (23) is installed at the lower opening of the voltage measurement terminal hole (22), and a wiring clearance groove (24) that cooperates with the wire clamping screw (23) is opened at the lower end of the lower cover (32).

8. A shunt according to claim 1, characterized in that, The copper bar (2) is a purple gold copper bar.

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