Leakage current sensor

Abstract

The invention, which relates to the technical field of the current sensor, discloses a leakage current sensor comprising a sensor main body provided with a detection through hole penetrating through two opposite sides of the sensor main body. The detection busbar comprises a first end, a second end and a detection part, the detection part penetrates through the detection through hole, and the first end and the second end are arranged outside the detection through hole, are respectively connected to two opposite ends of the detection part and are bent; the busbar mounting seat is fixedly connected to the sensor main body and is provided with a first accommodating groove and a second accommodating groove which have opposite bottom walls, are respectively arranged at two opposite ends of the detection through hole and are communicated with the detection through hole, the first accommodating groove is matched with the first end, and the second accommodating groove is matched with the second end; the bottom wall of the first containing groove and / or the bottom wall of the second containing groove are / is provided with crushing ribs, and the crushing ribs abut against the peripheral side, away from the second end, of the first end and / or abut against the peripheral side, away from the first end, of the second end. According to the invention, the tolerance during busbar assembly detection can be reduced, and the busbar assembly detection precision is improved.

Description

Technical Field

[0001] This invention relates to the technical field of current sensors, and particularly to a leakage current sensor. Background Technology

[0002] Leakage current may occur in some power systems. This leakage current can affect circuit components and impact the safety of the power system and operators. Therefore, it is essential to detect leakage current in power systems so that they can be started, stopped, and repaired in a timely manner.

[0003] Chinese utility model patent CN214335173U discloses a closed-loop leakage current sensor, including a magnetic core, a housing, and a wire support. The magnetic core has a first channel in its center for a wire (i.e., a current testing busbar) to pass through. The magnetic core is fixedly disposed within a cavity formed by the housing. The wire support includes a female and a male wire support end located on opposite sides of the housing and interlocking with each other. Both the female and male wire support ends have wire receiving cavities to accommodate and fix the wire to the housing. After passing through the wire receiving cavities, the wire is bent 90° along the first channel at both ends to limit its axial movement along the first channel, preventing it from shifting axially.

[0004] In the aforementioned related technologies, the dimensional tolerances during wire bending are limited, making it impossible to achieve precise axial positioning of the wire. After installation, the wire will still move axially along the first channel, affecting its installation accuracy and stability. Simultaneously, the fit between the wire and the wire receiving cavity in the wire support also has tolerances. When the wire diameter is small, a gap exists between the wire and the receiving cavity, making the wire prone to wobbling relative to the cavity, affecting the dimensional accuracy of the bent wire and the installation of the current sensor. When the wire diameter is large, an interference fit between the wire and the receiving cavity makes it difficult to install the wire within the guide cavity, and the stress from the compression between them can easily be transmitted to the magnetic core or housing, affecting its structural stability. Summary of the Invention

[0005] The purpose of this invention is to provide a leakage current sensor that can reduce the tolerance during the assembly of the detection busbar and improve the assembly accuracy of the detection busbar.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution: This invention provides a leakage current sensor, the leakage current sensor comprising: The sensor body has detection through holes that penetrate opposite sides of the sensor body; A detection busbar, comprising a first end, a second end, and a detection section, wherein the detection section passes through the detection through hole, and the first end and the second end are disposed outside the detection through hole and respectively connected to opposite ends of the detection section, wherein the first end and the second end are bent relative to the detection section; A busbar mounting base is fixedly connected to the sensor body. The busbar mounting base has a first receiving groove and a second receiving groove disposed opposite to each other on its bottom wall. The first receiving groove and the second receiving groove are respectively disposed at opposite ends of the detection through hole and communicate with the detection through hole. The first receiving groove is fitted to the first end, and the second receiving groove is fitted to the second end. The bottom wall of the first receiving groove is provided with a crushing rib, which abuts against the periphery of the first end away from the second end; and / or, the bottom wall of the second receiving groove is provided with a crushing rib, which abuts against the periphery of the second end away from the first end; the crushing rib is capable of deforming under the compression of the detection busbar.

[0007] Furthermore, the busbar mounting base includes a first mounting body and a second mounting body that are detachably connected. The first mounting body and the second mounting body are respectively disposed on opposite sides of the sensor body. The first receiving groove is disposed on the first mounting body, and the second receiving groove is disposed on the second mounting body.

[0008] Furthermore, the detection busbar is provided with multiple sections, and the number of the first and second receiving slots is the same as the number of the detection busbars, with the first receiving slot and the second receiving slot corresponding one-to-one.

[0009] Furthermore, multiple crushing ribs are provided, the length direction of the crushing ribs is perpendicular to the axial direction of the first end or the second end, and the thickness of the crushing ribs gradually decreases along the direction close to the sensor body.

[0010] Furthermore, the first receiving groove is provided with an interference rib, the interference rib protruding from the side wall of the first receiving groove and abutting against the periphery of the first end; and / or, the side wall of the second receiving groove is provided with an interference rib, the interference rib protruding from the side wall of the second receiving groove and abutting against the periphery of the second end.

[0011] Furthermore, the busbar mounting base has a thinning region corresponding to the portion of the first receiving groove away from the detection through hole and / or the portion of the second receiving groove away from the detection through hole, wherein the thickness of the first receiving groove and / or the second receiving groove at the thinning region is less than the thickness of the other portions of the first receiving groove and / or the second receiving groove.

[0012] Furthermore, the bottom wall of the first receiving groove is provided with a limiting protrusion, which abuts against the periphery of the first end; and / or, the bottom wall of the second receiving groove is provided with a limiting protrusion, which abuts against the periphery of the second end.

[0013] Furthermore, the busbar mounting base is provided with a plurality of heat dissipation holes, which are connected to the first receiving groove or the second receiving groove.

[0014] Furthermore, the busbar mounting base also includes a limiting rib and a guide rib, the limiting rib passing through the detection through hole, and the detection part being located between the limiting rib and the inner wall of the detection channel; The limiting rib is connected to the first mounting body and extends toward the second mounting body; the guide rib is connected to the second mounting body; the guide rib forms a limiting step with the edge of the opening of the second receiving groove; and / or, the limiting rib is connected to the second mounting body and extends toward the first mounting body; the guide rib is connected to the first mounting body; the guide rib forms a limiting step with the edge of the opening of the first receiving groove; and the end of the limiting rib away from the second mounting body cooperates with the limiting step.

[0015] Furthermore, multiple first and second receiving slots are provided in a one-to-one correspondence; in two adjacent first receiving slots, the edge of the opening of one first receiving slot is connected to the limiting rib, and the edge of the opening of the other first receiving slot is provided with the guide rib to form the limiting step; in two adjacent second receiving slots, the edge of the opening of one second receiving slot is connected to the guide rib to form the limiting step, and the edge of the opening of the other second receiving slot is provided with the guide rib.

[0016] In summary, the present invention has the following beneficial effects: 1. In the leakage current sensor of the present invention, the detection part of the detection busbar passes through the detection through hole of the sensor body, and the current flowing through the detection busbar is detected by the sensor body; the first end and the second end of the detection busbar are respectively disposed outside the detection through hole and bent relative to the detection part, and the first end and the second end are correspondingly matched with the first receiving groove and the second receiving groove of the busbar mounting base, thereby limiting the axial movement of the detection busbar at both ends of the detection busbar by the bottom wall of the first receiving groove and the bottom wall of the second receiving groove, so that the detection busbar is not easy to move axially relative to the detection through hole, thereby improving the efficiency of the sensor. The stability of the busbar assembly is tested. The bottom wall of the first receiving groove and / or the second receiving groove is provided with crushing ribs. When the first end is fitted into the first receiving groove, the first end is squeezed and the crushing ribs are deformed. And / or when the second end is fitted into the second receiving groove, the second end is squeezed and the crushing ribs are deformed. This makes the test busbar tightly abut against the first receiving groove and the second receiving groove, reduces the tolerance along the axial direction of the test part when the test busbar and the busbar mounting base are assembled, and further makes the test busbar less likely to move along the axial direction of the test through hole, thereby improving the assembly accuracy of the test busbar.

[0017] 2. The busbar mounting base includes a detachable first mounting body and a second mounting body, so that when installing the busbar mounting base, the first mounting body and the second mounting body can be installed from opposite sides of the sensor body, which facilitates the installation of the busbar mounting base.

[0018] 3. Multiple detection busbars, first receiving tanks, and second receiving tanks are provided to meet the current detection requirements of three-phase three-wire, three-phase four-wire, or other multi-wire circuits.

[0019] 4. The length direction of the crushing rib is perpendicular to the axial direction of the first or second end, so that the first or second end abuts against multiple crushing ribs; the thickness of the crushing rib gradually decreases along the direction close to the sensor body, so that the first or second end can compress the crushing rib and deform it.

[0020] 5. The sidewalls of the first receiving groove and / or the second receiving groove are provided with interference ribs. When the first end is fitted with the first receiving groove, the first end abuts against and compresses the interference rib and undergoes plastic deformation, reducing the fit tolerance between the first end and the first receiving groove, making it less likely for the first end to wobble in the first receiving groove; and / or, when the second end is fitted with the second receiving groove, the second end compresses the interference rib and undergoes plastic deformation, reducing the fit tolerance between the second end and the second receiving groove, making it less likely for the second end to wobble in the second receiving groove.

[0021] 6. When the first end mates with the first receiving groove and / or the second end mates with the second receiving groove, the busbar mounting base is more likely to deform in the thinned area to release stress, thereby reducing the risk of stress transmission to the core area of ​​the sensor body and causing cracking and damage to the sensor body.

[0022] 7. A limiting protrusion is provided on the bottom wall of the first receiving groove and / or the second receiving groove. The limiting protrusion abuts against the periphery of the first end and / or the second end, thereby reducing the contact area between the first end and / or the second end and the busbar mounting base. This makes it difficult for the heat generated by the current flowing through the detection busbar to be transferred to the sensor body through the busbar mounting base. At the same time, it creates a gap for airflow convection between the first end and the first receiving groove and / or between the second end and the second receiving groove, which is beneficial for heat dissipation of the first end and / or the second end.

[0023] 8. The busbar mounting base is provided with heat dissipation holes that connect to the first or second receiving slot to improve the heat dissipation effect of the first end and / or the second end.

[0024] 9. During the installation of the first and second mounting bodies, the limiting ribs pass through the detection through-holes and cooperate with the inner wall of the detection channel to limit the detection part, reducing the shaking of the detection part within the detection through-holes. Simultaneously, the limiting ribs also separate the detection parts of adjacent detection busbars, reducing the impact of creepage between detection parts. A pair of limiting ribs and guide ribs are respectively set on the first and second mounting bodies, so that when the first and second mounting bodies are assembled, the guide ribs guide the limiting ribs, facilitating the assembly of the first and second mounting bodies. One end of the limiting rib entering the detection through-hole cooperates with the limiting step, which not only limits the limiting rib but also makes the structure of the busbar mounting base more compact and stable. At the same time, this stepped interlocking structure allows the gap formed between the end of the limiting rib extending into the detection through-hole and the limiting step to be an L-shaped zigzag line, thus making the creepage path of the detection part at this gap zigzag, significantly increasing the creepage distance. This makes it less likely for adjacent detection parts to be affected by creepage, meeting the usage requirements when there are high requirements for creepage distance under specific working conditions.

[0025] 10. The first mounting body is connected to both limiting ribs and guide ribs to form a limiting step; correspondingly, the second mounting body is connected to both guide ribs to form a limiting step and limiting ribs; wherein, on the first mounting body, the groove edges of two adjacent first receiving grooves are respectively connected to limiting ribs and guide ribs; correspondingly, on the second mounting body, in two adjacent second receiving grooves, the groove edge of one is connected to a guide rib to cooperate with the limiting rib connected to the first mounting body, and the groove edge of the other is connected to a limiting rib to be inserted into the detection through hole and cooperate with the limiting step formed by the guide rib of the first mounting body; thereby, the creepage paths of adjacent detection parts are staggered, further reducing the impact of creepage. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural schematic diagram of a leakage current sensor according to an embodiment of the present invention.

[0027] Figure 2 This is a three-dimensional structural diagram of the sensor body and the detection busbar according to an embodiment of the present invention.

[0028] Figure 3 This is an exploded structural diagram of a leakage current sensor according to an embodiment of the present invention.

[0029] Figure 4 This is a three-dimensional structural schematic diagram of a busbar mounting base according to an embodiment of the present invention.

[0030] Figure 5 This is a three-dimensional structural diagram of the first mounting body according to an embodiment of the present invention.

[0031] Figure 6 This is a three-dimensional structural diagram of the second mounting body according to an embodiment of the present invention.

[0032] In the picture: 1000 Leakage current sensor; 100 Sensor body; 110 Detection through hole; 200 Detection busbar; 210 First end; 220 Second end; 230 Detection part; 300 Busbar mounting base; 310 First mounting body; 311 Male snap-fit; 312 First receiving groove; 313 Crushing rib; 320 Second mounting body; 321 Female snap-fit; 322 Second receiving groove; 330 Interference rib; 340 Thinning area; 350 Limiting protrusion; 360 Heat dissipation hole; 370 Limiting rib; 380 Guide rib; 390 Limiting step. Detailed Implementation

[0033] The invention will now be further described with reference to the accompanying drawings.

[0034] This embodiment discloses a leakage current sensor 1000, referring to... Figure 1 and Figure 2 The leakage current sensor 1000 includes a sensor body 100, a detection busbar 200, and a busbar mounting base 300. The sensor body 100 is provided with detection through holes 110 penetrating opposite sides of the sensor body 100 to detect the leakage current flowing through the detection busbar 200. The detection busbar 200 passes through the detection through holes 110 and is fixed to the sensor body 100 through the busbar mounting base 300.

[0035] In this embodiment, the sensor body 100 is cubic in shape, and the detection through-hole 110 is located at the center of the sensor body 100. The sensor body 100 includes a magnetic core, a sensing chip, and a housing. The magnetic core is disposed inside the housing and is a rectangular ring-shaped magnetic core, with its inner ring surrounding the detection through-hole 110. An air gap is provided in the magnetic core, and the sensing chip is placed in the air gap. The sensing chip can be a fluxgate magnet or a Hall element. When current flows through the busbar 200, a magnetic field is generated. The magnetic core converges the magnetic field and detects it through the sensing chip at the air gap. The sensing chip sends the detected signal to the processor for data processing via wires connected to its pins, thereby realizing the detection of leakage current in the busbar 200.

[0036] Reference Figure 2 In this embodiment, the detection busbar 200 is a wire with a circular cross-section. In other embodiments, the detection busbar 200 may also be other suitable shapes.

[0037] The detection busbar 200 includes a first end 210, a second end 220, and a detection section 230. The detection section 230 passes through the detection through hole 110. The first end 210 and the second end 220 are disposed outside the detection through hole 110 and are respectively connected to the opposite ends of the detection section 230. The first end 210 and the second end 220 are bent relative to the detection section 230 so that the detection busbar 200 is axially limited after the busbar mounting base 300 mates with the detection busbar 200. In this embodiment, the first end 210 and the second end 220 are bent at a 90° angle to the detection section 230. In other embodiments, the first end 210 and the second end 220 may also be bent at other angles relative to the detection section 230.

[0038] Reference Figure 1 and Figure 3 The busbar mounting base 300 is fixedly connected to the sensor body 100, and extends to the detection on opposite sides of the sensor body 100. The first end 210 and the second end 220 of the detection busbar 200 are engaged with the busbar mounting base 300 to fix the detection busbar 200 to the sensor body 100.

[0039] In this embodiment, the busbar mounting base 300 includes a detachably connected first mounting body 310 and a second mounting body 320. The first mounting body 310 and the second mounting body 320 are respectively disposed on opposite sides of the sensor body 100 and located at opposite ends of the detection through hole 110. The first end 210 is engaged with the first mounting body 310, and the second end 220 is engaged with the second mounting body 320. Thus, when installing the busbar mounting base 300, the first mounting body 310 and the second mounting body 320 can be installed from opposite sides of the sensor body 100, facilitating the installation of the busbar mounting base 300.

[0040] Reference Figure 3 and Figure 4 A male latch 311 extends from the first mounting body 310 toward the second mounting body 320, and a female latch 321 extends from the second mounting body 320 toward the first mounting body 310. The male latch 311 and the female latch 321 extend parallel to the detection through hole 110 and engage with each other to connect the first mounting body 310 and the second mounting body 320. Two sets of male latches 311 and female latches 321 are provided, respectively located on opposite sides of the sensor body 100 parallel to the detection through hole 110. Therefore, when the first mounting body 310 and the second mounting body 320 are connected, the busbar mounting base 300 hugs the sensor body 100 to securely connect to it.

[0041] In addition, in other embodiments, the first mounting body 310 and the second mounting body 320 may also be detachably connected by screws or other suitable means.

[0042] In other embodiments, the busbar mounting base 300 may be configured as a single unit, while the sensor body 100 may be configured as a separate unit for connection between the busbar mounting base 300 and the sensor body 100.

[0043] Reference Figures 3 to 6 The busbar mounting base 300 has a first receiving groove 312 and a second receiving groove 322. The first receiving groove 312 and the second receiving groove 322 are respectively located at opposite ends of the detection through hole 110 and communicate with the detection through hole 110. The openings of the first receiving groove 312 and the second receiving groove 322 are both facing the opposite side of the first mounting body 310 and the second mounting body 320, so that the bottom walls of the first receiving groove 312 and the second receiving groove 322 are facing each other.

[0044] The first receiving groove 312 is fitted to the first end 210, and the second receiving groove 322 is fitted to the second end 220, thereby fixing the first end 210 and the second end 220 to the busbar mounting base 300. The bottom walls of the first receiving groove 312 and the bottom walls of the second receiving groove 322 limit the axial movement of the detection busbar 200 at both ends, making it less likely for the detection busbar 200 to move axially relative to the detection through hole 110, thus improving the assembly stability of the detection busbar 200.

[0045] Specifically, in this embodiment, the first receiving groove 312 is disposed on the first mounting body 310, and the second receiving groove 322 is disposed on the second mounting body 320. When installing the busbar mounting base 300, the first mounting body 310 and the second mounting body 320 approach and engage from opposite sides of the sensor body 100, and the first end 210 and the second end 220 are respectively inserted into the first receiving groove 312 and the second receiving groove 322, which facilitates the assembly of the leakage current sensor 1000.

[0046] In this embodiment, the extension direction of the first receiving groove 312 is parallel to the first end 210, and the extension direction of the second receiving groove 322 is parallel to the second end 220. That is, both the first receiving groove 312 and the second receiving groove 322 extend perpendicular to the direction of the detection through hole 110, so as to better fit with the first end 210 and the second end 220.

[0047] The detection busbar 200 is provided with multiple first receiving slots 312 and second receiving slots 322, the number of which is the same as the number of detection busbars 200. Each first receiving slot 312 corresponds one-to-one with each second receiving slot 322; that is, each first receiving slot 312 is directly opposite one second receiving slot 322, and each first receiving slot 312 is directly opposite only one second receiving slot 322. The first end 210 of each detection busbar 200 is inserted into a first receiving slot 312, and the second end 220 is inserted into the second receiving slot 322 directly opposite the first receiving slot 312. The detection sections 230 of the multiple detection busbars 200 are parallel and spaced apart through the detection through holes 110. This allows the detection requirements of multiple detection busbars 200 to be met, satisfying the current detection requirements of three-phase three-wire, three-phase four-wire, or other multi-wire circuits.

[0048] Specifically, in this embodiment, four detection busbars 200 are provided, one of which serves as an independent grounding wire. This means the leakage current sensor is a three-phase four-wire current sensor. The grounding wire reduces safety hazards when the equipment experiences insulation aging or a short circuit. During use, stray currents can easily introduce interference signals, affecting measurement accuracy. This embodiment provides a stable and reliable grounding path to suppress common-mode magnetic field interference.

[0049] Correspondingly, the first mounting body 310 is provided with four first receiving slots 312, and the second mounting body 320 is provided with four second receiving slots 322 corresponding to the four first receiving slots 312. In this embodiment, two first receiving slots 312 are provided on the same horizontal plane perpendicular to the detection through hole 110 and extend in opposite directions, while the other two first receiving slots 312 are provided on another horizontal plane perpendicular to the detection through hole 110 and extend in opposite directions. The two first receiving slots 312 with the same extension direction are located at the same end of the first mounting body 310, and the lengths of the two first receiving slots 312 are different, so as to facilitate wiring after the two first ends 210 are installed. The arrangement of the second receiving slots 322 on the second mounting body 320 is the same as that of the first receiving slots 312 on the first mounting body 310. This makes the structure of the busbar mounting base 300 more reasonable.

[0050] In addition, in other embodiments, the first receiving groove 312 and the second receiving groove 322 may also be configured in other suitable forms.

[0051] Reference Figure 3 and Figure 5 In this embodiment, the bottom wall of the first receiving groove 312 is provided with a crushing rib 313, which abuts against the periphery of the first end 210 away from the second end 220. When the first end 210 is engaged with the first receiving groove 312, the first end 210 compresses the crushing rib 313, causing the crushing rib 313 to deform. This allows the detection busbar 200 to tightly abut against the first receiving groove 312 and the second receiving groove 322, reducing the tolerance along the axial direction of the detection part 230 when the detection busbar 200 and the busbar mounting base 300 are assembled. Furthermore, this makes it less likely for the detection busbar 200 to move axially along the detection through hole 110, improving the assembly accuracy and stability of the detection busbar 200. This can prevent the detection busbar 200 from becoming loose due to excessive distance between it and the busbar mounting base 300, or the detection busbar 200 from becoming stress-concentrated and improperly assembled due to insufficient distance between it and the detection busbar 200 mounting body.

[0052] In other embodiments, the crushing rib 313 may also be provided on the bottom wall of the second receiving groove 322, with the crushing rib 313 abutting against the circumference of the second end 220 away from the first end 210. When the second end 220 is fitted into the second receiving groove 322, the second end 220 compresses and forces the crushing rib 313 to deform, thereby making the detection busbar 200 tightly abut against the first receiving groove 312 and the second receiving groove 322, reducing the tolerance along the axial direction of the detection section 230 when the detection busbar 200 and the busbar mounting base 300 are assembled.

[0053] In other embodiments, crushing ribs 313 may also be provided on the bottom wall of the first receiving groove 312 and the bottom wall of the second receiving groove 322.

[0054] In this embodiment, multiple crushing ribs 313 are provided, and the multiple crushing ribs 313 are arranged in parallel and spaced apart. The length direction of the crushing ribs 313 is perpendicular to the axial direction of the first end 210, so that the periphery of the first end 210 simultaneously contacts and abuts against the multiple crushing ribs 313, thereby causing the crushing ribs 313 to deform.

[0055] In other embodiments, when the bottom wall of the second receiving groove 322 is provided with crushing ribs 313, the crushing ribs 313 are perpendicular to the axial direction of the second end 220, so that the second end 220 abuts and squeezes to deform the multiple crushing ribs 313.

[0056] In this embodiment, the thickness of the crushing rib 313 gradually decreases along the direction close to the sensor body 100 (i.e., away from the bottom wall of the first receiving groove 312), so that the crushing rib 313 is forced to deform when the first end 210 contacts the crushing rib 313.

[0057] Specifically, in this embodiment, the cross-section of the crushing rib 313 is triangular. Furthermore, in other embodiments, the cross-sectional shape of the crushing rib 313 may also be arc-shaped or trapezoidal.

[0058] Reference Figure 3 , Figure 5 and Figure 6 In this embodiment, interference ribs 330 are provided on the sidewalls of the first receiving groove 312 (i.e., the inner wall of the first receiving groove 312 perpendicular to the bottom wall) and the sidewalls of the second receiving groove 322. The interference ribs 330 in the first receiving groove 312 protrude from the sidewalls of the first receiving groove 312 and abut against the periphery of the first end 210. The interference ribs 330 in the second receiving groove 322 protrude from the sidewalls of the second receiving groove 322 and abut against the periphery of the second end 220. When the first end 210 mates with the first receiving groove 312, the first end 210 abuts against and compresses the interference ribs 330 and undergoes plastic deformation, reducing the fit tolerance between the first end 210 and the first receiving groove 312, making it less likely for the first end 210 to wobble within the first receiving groove 312. When the second end 220 is engaged with the second receiving groove 322, the second end 220 compresses the interference rib 330 and undergoes plastic deformation, reducing the fit tolerance between the second end 220 and the second receiving groove 322, making it less likely for the second end 220 to shake within the second receiving groove 322.

[0059] Therefore, the first end 210 and the second end 220 of the detection busbar 200 are interference-fitted into the first receiving groove 312 and the second receiving groove 322, which can effectively and firmly clamp the detection busbar 200 in the busbar mounting base 300, preventing the detection busbar 200 from loosening or shifting. This not only improves the structural stability but also the vibration resistance and improves the assembly accuracy of the leakage current sensor 1000 during installation.

[0060] In addition, in other embodiments, interference ribs 330 may be provided only in one of the first receiving groove 312 and the second receiving groove 322.

[0061] Reference Figure 4 The busbar mounting base 300 is provided with a thinning region 340. In this embodiment, the thinning region 340 is provided in the portion of the busbar mounting base 300 corresponding to the portion of the first receiving groove 312 away from the detection through hole 110 and the portion of the second receiving groove 322 away from the detection through hole 110. At the thinning region 340, the thickness of the first receiving groove 312 and the second receiving groove 322 is less than the thickness of other portions of the first receiving groove 312 and the second receiving groove 322. This makes it easier for the busbar mounting base 300 to deform at the thinning region 340 to release stress when the first end 210 is interference-fitted with the first receiving groove 312 and the second end 220 is interference-fitted with the second receiving groove 322. This reduces the risk of stress transmission to the core area of ​​the sensor body 100, causing the sensor body 100 to crack and be damaged.

[0062] According to finite element analysis, the thinned region 340 can withstand more than 90% of the deformation of the busbar mounting base 300. In this embodiment, the crushing rib 313 absorbs the tolerance of the detection busbar 200, and the thinned region 340 absorbs the assembly deformation of the interference rib 330, achieving dual-path isolation. The thinned region 340 and the crushing rib 313 work together to shorten the position fluctuation tolerance of the first end 210 and the second end 220 from ±0.5mm to ±0.2mm, greatly improving the assembly accuracy of the leakage current sensor 1000.

[0063] Reference Figure 3 and Figure 6 In this embodiment, a limiting protrusion 350 is provided on the bottom wall of the second receiving groove 322. The limiting protrusion 350 abuts against the periphery of the second end 220, thereby reducing the contact area between the second end 220 and the inner wall of the second receiving groove 322. This makes it difficult for the heat generated by the current flowing through the detection busbar 200 to be transferred to the sensor body 100 through the busbar mounting base 300. At the same time, it creates a gap for airflow convection between the second end 220 and the second receiving groove 322, which is beneficial for the heat dissipation of the second end 220.

[0064] In addition, in other embodiments, a limiting protrusion 350 abutting against the periphery of the first end 210 may also be provided on the bottom wall of the first receiving groove 312. When both the crushing rib 313 and the limiting protrusion 350 are provided in the first receiving groove 312, the height of the crushing rib 313 should be slightly greater than the height of the limiting protrusion 350, so that the first end 210 can compress the crushing rib 313.

[0065] In this embodiment, the bottom wall of the first receiving groove 312 is provided with a crushing rib 313, and the bottom wall of the second receiving groove 322 is provided with a limiting protrusion 350. During the actual assembly process, the limiting protrusion 350 presses against the second end 220, and then force is applied to make the crushing rib 313 press against the first end 210, and the first mounting body 310 and the second mounting body 320 move towards each other and press until the assembly is fastened in place.

[0066] In this embodiment, the height of the limiting protrusion 350 (i.e., the distance from the bottom wall of the second receiving groove 322) is half the diameter of the second end 220. Furthermore, in other embodiments, the limiting protrusion 350 may be set to other suitable heights.

[0067] Reference Figures 1 to 6The busbar mounting base 300 has multiple heat dissipation holes 360, which are connected to either the first receiving groove 312 or the second receiving groove 322. Specifically, the heat dissipation holes 360 are distributed on the first mounting body 310 and the second mounting body 320. The heat dissipation holes 360 on the first mounting body 310 are connected to the first receiving groove 312, and the heat dissipation holes 360 on the second mounting body 320 are connected to the second receiving groove 322. By providing heat dissipation holes 360 that connect to the first receiving groove 312 or the second receiving groove 322, the heat dissipation effect of the first end 210 and the second end 220 is improved.

[0068] In addition, in other embodiments, only the heat dissipation hole 360 ​​communicating with the first receiving groove 312 may be provided, or only the mounting hole communicating with the second receiving groove 322 may be provided.

[0069] In this embodiment, the heat dissipation hole 360 ​​is an elongated hole, and the heat dissipation hole 360 ​​is arranged parallel to the axial direction of the detection busbar 200. That is, at the first receiving groove 312, the heat dissipation hole 360 ​​is arranged along the axial direction of the first end 210; at the second receiving groove 322, the heat dissipation hole 360 ​​is arranged along the axial direction of the second end 220. At the bend of the relative detection portion 230 between the first end 210 and the second end 220, the heat dissipation hole 360 ​​is arranged along the axial direction of the detection portion 230.

[0070] In addition, in other embodiments, the heat dissipation hole 360 ​​may also be other suitable shapes and other suitable arrangements.

[0071] Reference Figures 4 to 6 The busbar mounting base 300 also includes a limiting rib 370 and a guide rib 380. The limiting rib 370 passes through the detection through hole 110, and the detection part 230 is limited between the limiting rib 370 and the inner wall of the detection channel. When the first mounting body 310 and the second mounting body 320 are installed, the limiting rib 370 passes through the detection through hole 110 and cooperates with the inner wall of the detection channel to limit the detection part 230, reducing the shaking of the detection part 230 in the detection through hole 110. At the same time, the limiting rib 370 can also separate the detection parts 230 of adjacent detection busbars 200, reducing the impact of creepage between the detection parts 230.

[0072] The limiting rib 370 and the guide rib 380 are arranged in pairs. The limiting rib 370 is connected to one of the first mounting body 310 and the second mounting body 320, and the corresponding guide rib 380 is connected to the other of the first mounting body 310 and the second mounting body 320.

[0073] In one embodiment, the limiting rib 370 is connected to the first mounting body 310 and extends toward the second mounting body 320. The guide rib 380 is connected to the second mounting body 320, and the guide rib 380 and the edge of the groove of the second receiving groove 322 form a limiting step 390. The end of the limiting rib 370 away from the first mounting body 310 engages with the limiting step 390. This allows the guide rib 380 to guide the limiting rib 370 when the first mounting body 310 and the second mounting body 320 are engaged, facilitating the assembly of the first mounting body 310 and the second mounting body 320. The end of the limiting rib 370 that passes through the detection through hole 110 engages with the limiting step 390, which limits the limiting rib 370, making the structure of the busbar mounting base 300 more compact and stable.

[0074] This stepped interlocking structure allows the gap formed by the end of the limiting rib 370 extending into the detection through hole 110 and the limiting step 390 to be an L-shaped broken line, thereby making the creepage path of the detection part 230 at the gap a broken line, greatly increasing the creepage distance, so that the adjacent detection parts 230 are less likely to be affected by creepage, and meeting the usage requirements when there are high requirements for creepage distance under specific working conditions.

[0075] In some embodiments, the limiting rib 370 may also be connected to the second mounting body 320 and extend toward the first mounting body 310. Correspondingly, the guide rib 380 is connected to the first mounting body 310. The guide rib 380 and the groove edge of the first receiving groove 312 form a limiting step 390. The end of the limiting rib 370 away from the second mounting body 320 is engaged with the limiting step 390.

[0076] In this embodiment, multiple pairs of limiting ribs 370 and guide ribs 380 are provided, with one pair of limiting ribs 370 and guide ribs 380 corresponding to each detection part 230. On the first mounting body 310, in two adjacent first receiving grooves 312, the edge of the groove opening of one first receiving groove 312 is connected to a limiting rib 370, and the edge of the groove opening of the other first receiving groove 312 is provided with a guide rib 380 to form a limiting step 390. On the second mounting body 320, in two adjacent second receiving grooves 322, the edge of the groove opening of one second receiving groove 322 is connected to a guide rib 380 to form a limiting step 390, and the edge of the groove opening of the other second receiving groove 322 is provided with a guide rib 380.

[0077] The first mounting body 310 is connected to both a limiting rib 370 and a guide rib 380 to form a limiting step 390. Correspondingly, the second mounting body 320 is connected to both a guide rib 380 to form a limiting step 390 and a limiting rib 370. On the first mounting body 310, the edges of the openings of two adjacent first receiving grooves 312 are respectively connected to the limiting rib 370 and the guide rib 380. Correspondingly, on the second mounting body 320, in two adjacent second receiving grooves 322, one groove edge is connected to the guide rib 380 to engage with the limiting rib 370 connected to the first mounting body 310, and the other groove edge is connected to the limiting rib 370 to insert into the detection through hole 110 and engage with the limiting step 390 formed at the guide rib 380 of the first mounting body 310. This allows the creepage paths of adjacent detection units 230 to be staggered, further reducing the impact of creepage.

[0078] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A leakage current sensor, characterized in that, The leakage current sensor (1000) includes: The sensor body (100) is provided with detection through holes (110) penetrating opposite sides of the sensor body (100); A detection busbar (200) is provided, comprising a first end (210), a second end (220), and a detection section (230). The detection section (230) passes through the detection through hole (110). The first end (210) and the second end (220) are disposed outside the detection through hole (110) and respectively connected to the opposite ends of the detection section (230). The first end (210) and the second end (220) are bent relative to the detection section (230). A busbar mounting base (300) is fixedly connected to the sensor body (100). The busbar mounting base (300) has a first receiving groove (312) and a second receiving groove (322) with opposite bottom walls. The first receiving groove (312) and the second receiving groove (322) are respectively located at opposite ends of the detection through hole (110) and communicate with the detection through hole (110). The first receiving groove (312) is fitted to the first end (210), and the second receiving groove (322) is fitted to the second end (220). The bottom wall of the first receiving groove (312) is provided with a crushing rib (313), which abuts against the periphery of the first end (210) away from the second end (220); and / or, the bottom wall of the second receiving groove (322) is provided with a crushing rib (313), which abuts against the periphery of the second end (220) away from the first end (210); the crushing rib (313) can deform under the compression of the detection busbar (200).

2. A leakage current sensor as described in claim 1, characterized in that, The busbar mounting base (300) includes a first mounting body (310) and a second mounting body (320) that are detachably connected. The first mounting body (310) and the second mounting body (320) are respectively disposed on opposite sides of the sensor body (100). The first receiving groove (312) is disposed on the first mounting body (310), and the second receiving groove (322) is disposed on the second mounting body (320).

3. A leakage current sensor as described in claim 1 or 2, characterized in that, The detection busbar (200) is provided in multiple ways. The number of the first receiving slot (312) and the second receiving slot (322) is the same as the number of the detection busbar (200). The first receiving slot (312) and the second receiving slot (322) correspond one-to-one.

4. A leakage current sensor as described in claim 1, characterized in that, Multiple crushing ribs (313) are provided. The length direction of the crushing ribs (313) is perpendicular to the axial direction of the first end (210) or the second end (220). The thickness of the crushing ribs (313) gradually decreases along the direction close to the sensor body (100).

5. A leakage current sensor as described in claim 1, characterized in that, An interference rib (330) is provided in the first receiving groove (312), the interference rib (330) protrudes from the side wall of the first receiving groove (312) and abuts against the periphery of the first end (210); and / or, an interference rib (330) is provided in the side wall of the second receiving groove (322), the interference rib (330) protrudes from the side wall of the second receiving groove (322) and abuts against the periphery of the second end (220).

6. A leakage current sensor as described in claim 5, characterized in that, The busbar mounting base (300) has a thinning region (340) corresponding to the portion of the first receiving groove (312) away from the detection through hole (110) and / or the portion of the second receiving groove (322) away from the detection through hole (110), wherein the thickness of the first receiving groove (312) and / or the second receiving groove (322) at the thinning region (340) is less than the thickness of the other portions of the first receiving groove (312) and / or the second receiving groove (322).

7. A leakage current sensor as described in claim 1, characterized in that, The bottom wall of the first receiving groove (312) is provided with a limiting protrusion (350), which abuts against the periphery of the first end (210); and / or, the bottom wall of the second receiving groove (322) is provided with a limiting protrusion (350), which abuts against the periphery of the second end (220).

8. A leakage current sensor as described in claim 7, characterized in that, The busbar mounting base (300) is provided with a plurality of heat dissipation holes (360), which are connected to the first receiving groove (312) or the second receiving groove (322).

9. A leakage current sensor as described in claim 2, characterized in that, The busbar mounting base (300) further includes a limiting rib (370) and a guide rib (380). The limiting rib (370) passes through the detection through hole (110), and the detection part (230) is located between the limiting rib (370) and the inner wall of the detection channel. The limiting rib (370) is connected to the first mounting body (310) and extends toward the second mounting body (320). The guide rib (380) is connected to the second mounting body (320). The guide rib (380) and the groove edge of the second receiving groove (322) form a limiting step (390). The end of the limiting rib (370) away from the first mounting body (310) is engaged with the limiting step (390). And / or, the limiting rib (370) is connected to the second mounting body (320) and extends toward the first mounting body (310). The guide rib (380) is connected to the first mounting body (310). The guide rib (380) and the groove edge of the first receiving groove (312) form a limiting step (390). The end of the limiting rib (370) away from the second mounting body (320) is engaged with the limiting step (390).

10. A leakage current sensor as described in claim 9, characterized in that, The first receiving groove (312) and the second receiving groove (322) are provided in a one-to-one correspondence. In two adjacent first receiving grooves (312), the groove edge of one first receiving groove (312) is connected with the limiting rib (370), and the groove edge of the other first receiving groove (312) is provided with the guide rib (380) to form the limiting step (390). In two adjacent second receiving grooves (322), the groove edge of one second receiving groove (322) is connected with the guide rib (380) to form the limiting step (390), and the groove edge of the other second receiving groove (322) is provided with the guide rib (380).

Images