Current sensor

Abstract

The invention relates to the technical field of sensors, in particular to a current sensor which comprises a shell, wrenches, a driving spring and a button, the number of the wrenches is two, one ends of the two wrenches are rotationally installed in the shell through two symmetrically-arranged rotating shafts respectively, the other ends of the two wrenches extend out of the shell, and the two ends of the button are located on the inner side and the outer side of the shell respectively. The end, located in the shell, of the button is connected with the driving spring, the other end of the driving spring is connected with the shell, a transmission assembly and a plurality of clamping blocks are arranged in the wrench, the clamping blocks are annularly and evenly distributed around the axis of the wrench and installed in the wrench in a sliding mode, and the sliding directions all point to the axis of the threading hole. According to the current sensor, through the cooperation of the driving assembly and the clamping block, the clamping block is driven by the driving assembly to push the measured conductor, so that the axis of the measured conductor coincides with the axis of the threading hole, and the measurement accuracy of the current sensor is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a current sensor. BACKGROUND

[0002] The current sensor is a detection device that can sense the measured current and convert it into an available output signal according to a certain rule. The current sensor is divided into resistance shunt, electromagnetic current transformer, Hall current sensor, Rogowski coil current sensor and fluxgate current sensor according to the measurement principle. Among them, the Hall current sensor is based on the Hall effect. When the current vertically passes through the Hall element placed in the magnetic field, the charge carriers are deflected by the Lorentz force in the magnetic field, and a potential difference is generated in the direction perpendicular to the current and the magnetic field. Then the current size is obtained by measuring the voltage difference. The Hall current sensor has the advantages of fast response speed, high precision, good isolation performance and strong overload capacity, and is widely used in industrial automation, power systems, new energy fields and other fields.

[0003] When measuring the current in the measured conductor, the measured conductor needs to pass through the threading hole in the sensor for measurement. However, since the sensor does not have a limiting device, it is difficult for the measured conductor to coincide with the axis of the threading hole on the sensor. The axis of the measured conductor deviates from the axis of the threading hole of the sensor, resulting in uneven distribution of the magnetic field in the sensor, which in turn changes the distribution of the potential difference, so that the measured Hall voltage is different from the voltage under the condition of uniform magnetic field, thereby reducing the measurement accuracy.

[0004] To this problem, a solution is provided in the prior art, for example, the invention patent with patent application number CN202411388372.6 provides a magnetic flux gate current sensor and its use method, which provides the technical scheme as follows, a magnetic flux gate current sensor, comprising a base and a magnetic flux gate sensor, the magnetic flux gate sensor is installed on the top of the base, the magnetic flux gate current sensor further comprises a positioning mechanism, the positioning mechanism comprises a shell, a first turntable, a guide groove, a worm gear tooth, a sliding block, a pin and a roller, the first turntable is rotatably inserted in the inner cavity of the shell, three guide grooves are equidistantly opened on the front surface of the first turntable along the circumference, the sliding block is equidistantly inserted in the inner side of the shell along the circumference, the pin is installed on the outer side of the sliding block, the other end is inserted into the inner cavity of the guide groove, the rotation of the first turntable is converted into the linear motion of the sliding block through the cooperation of the pin and the guide groove, the roller is rotatably installed on the inner side of the sliding block, a driving assembly is installed on the top end of the side wall of the shell, the first turntable rotates clockwise under the cooperation of the worm and the worm gear tooth, the guide groove extrudes the pin inward, the sliding block moves inward, the roller clamps and limits the measured conductor, so that the measured conductor is always in the center of the magnetic flux gate sensor, the magnetic field distortion is reduced, and the measurement accuracy is improved; but there is a Hall current sensor with a clamp structure in the Hall current sensor, which combines the convenience of the clamp structure and the current measurement device of the measurement principle of the Hall effect, the clamp Hall current sensor has the advantages of small size, light weight and easy to carry, and can be used flexibly in different working sites, the design of the first turntable and the worm gear tooth in the above technical scheme conflicts with the clamp structure in the clamp Hall current sensor, so that the above scheme cannot be applied to the clamp Hall current sensor. SUMMARY

[0005] The purpose of the present application is to provide a current sensor to solve the problem that the axis of the threading hole deviates from the center of the measured conductor in the Hall current sensor with a clamp structure, causing uneven distribution of the magnetic field in the sensor, which in turn changes the distribution of the potential difference, making the measured Hall voltage different from the voltage in the case of uniform magnetic field, thereby reducing the measurement accuracy.

[0006] To achieve the above purpose, the present application provides the following technical scheme:

[0007] The utility model provides a kind of current sensor including shell, wrench, drive spring and button, the symmetry two rotating shafts are provided in the shell, two the one end of the wrench is respectively rotated and installed in shell by two rotating shafts, the other end extends to shell outside, two the inside wall of the wrench closure forms circular threading hole, the outer wall of one end of two the wrench in shell is equipped with mutually meshing tooth, the button is connected with any wrench, the two ends of the button are located at the inside and outside of shell respectively, and the one end of button in shell is connected with drive spring, the other end of drive spring is connected with shell, the drive spring is compressed state when two the wrench is in open state.

[0008] Specifically, the wrench is provided with a transmission assembly and a plurality of clamping blocks. The plurality of clamping blocks are slidingly installed in the wrench around the axis of the threading hole in a ring shape and in a direction pointing to the axis of the threading hole. One end of the clamping block provided in the wrench is provided with an inclined surface. The inclined surface is connected with the drive assembly. When the elastic potential energy of the drive spring is released, the clamping block is driven by the transmission assembly to slide in the direction of the axis of the threading hole.

[0009] When the measured conductor is to be measured, the button is pressed to move into the shell. At this time, the drive spring is compressed, and the button drives one of the wrenches to rotate around the rotating shaft. In the process, the two tooth gears on the two wrenches are meshed with each other, and the wrench connected with the button drives the other wrench to rotate. In this process, the other wrench rotates around the axis of the rotating shaft provided inside. At this time, the two ends of the two wrenches outside the shell are separated. At this time, the threading hole is open. Move the current sensor, and pass the measured conductor through the opening into the threading hole. At this time, the button is released, the elastic potential energy of the drive spring is released to push the button to move out of the shell. The button drives one of the wrenches to rotate around the rotating shaft. In the process, the other wrench is driven to rotate around the rotating shaft through the meshing of the tooth gears on one end of the two wrenches. At this time, the two ends of the two wrenches are reconnected. At this time, the threading hole is closed. At the same time, the magnetic ring is energized to form a magnetic field around the magnetic ring. At this time, the current in the measured conductor passes through the magnetic field vertically. The electrons are deflected by the Lorentz force in the magnetic field. In the direction perpendicular to the current and the magnetic field, a potential difference is generated. Then the current is obtained by measuring the voltage difference. Through the opening and closing of the wrench, the measured conductor does not need to be powered off and complicatedly installed and wired during measurement. It is convenient for current measurement and suitable for various application scenarios such as on-site detection and fault diagnosis.

[0010] Further, when measuring the measured conductor, the axis of the threading hole in the Hall current sensor of the clamp structure deviates from the center of the measured conductor, which causes the magnetic field distribution in the sensor to be uneven, thereby changing the potential difference distribution and affecting the measurement accuracy of the Hall current sensor of the clamp structure on the current and other physical quantities. Therefore, through the design of multiple clamping blocks and cooperation with the driving assembly, the driving assembly converts the energy released by the elastic potential energy of the driving spring and acts on the first inclined surface connected thereto, thereby pushing the clamping block. At this time, the sliding direction of the clamping block points to the axis of the threading hole L and the design of the annularly and uniformly distributed multiple clamping blocks, so that the multiple clamping blocks move from multiple directions to the axis of the threading hole. In the process, the clamping block contacts the measured conductor, and as the clamping block continues to move towards the axis of the threading hole, the measured conductor is pushed to the center of the threading hole, so that the axis of the measured conductor coincides with the axis of the threading hole. Avoid the situation that the axis of the threading hole in the Hall current sensor of the clamp structure deviates from the center of the measured conductor, which causes the magnetic field distribution in the sensor to be uneven, thereby changing the potential difference distribution and affecting the measurement accuracy of the Hall current sensor of the clamp structure on the current and other physical quantities. Thus, the accuracy of the measurement of the Hall current sensor of the clamp structure is ensured.

[0011] Preferably, the driving assembly comprises a driving ring and multiple push blocks, the spanner is provided with a sliding cavity, the sliding cavity is arc-shaped and coaxially arranged with the spanner, the driving ring is slidingly installed in the sliding cavity, an arc-shaped groove is coaxially arranged on the driving ring, the shaft penetrates through the arc-shaped groove, a second gear is arranged on one side wall of the arc-shaped groove, a third gear is uniformly arranged on the outer wall of the shaft in the arc-shaped groove, and the third gear is engaged with the second gear, multiple matching grooves are arranged on the inner wall of the driving ring, multiple push blocks are installed in the matching grooves, multiple clamping blocks are arranged in the matching grooves, the push block is located on the side of the clamping block close to the shaft, the first inclined surface is located on the side of the clamping block close to the shaft, a second inclined surface is arranged on the side wall of the push block, and the first inclined surface and the second inclined surface are slidingly connected.

[0012] The elastic potential energy of the driving spring is released to push the button to drive the wrench to rotate around the rotating shaft, and the two rotating shafts are engaged with the second teeth on the side wall of the arc-shaped groove through the third teeth on the outer wall of the rotating shaft, so that the driving ring and the rotating shaft rotate relatively, the driving ring slides in the sliding cavity, and the push block moves in the sliding process of the driving ring.

[0013] Preferably, the first inclined surface is provided with a first boss, and the second inclined surface is provided with a first clamping groove.

[0014] When the measurement of the measured conductor is completed, the button needs to be pressed to separate the two wrenches, and then the current sensor is removed. However, since the clamp block is in sliding connection with the wrench and loses the support of the outer wall of the measured conductor, the clamp block may be separated from the wrench during the transfer of the current sensor, resulting in the loss of the clamp block, so that the clamp block cannot clamp the measured conductor during the next measurement, and the axis of the measured conductor cannot coincide with the axis of the threading hole, affecting the measurement accuracy. Through the cooperation between the first clamping groove on the second inclined surface and the first boss on the first inclined surface, the clamp block and the push block are matched to limit the sliding direction of the clamp block, so that the clamp block cannot be separated from the wrench during the transfer of the current sensor, the loss of the clamp block is avoided, the clamp block cannot clamp the measured conductor during the next measurement, and the axis of the measured conductor cannot coincide with the axis of the threading hole, thereby ensuring the measurement accuracy of the current sensor.

[0015] Further, during the separation of the two wrenches, the wrench rotates reversely around the rotating shaft, and at this time, the third teeth on the outer wall of the rotating shaft are engaged with the second teeth on the side wall of the arc-shaped groove, thereby driving the driving ring to slide in the sliding cavity, driving the push block to move, and driving the clamp block to retreat into the wrench under the cooperation of the first clamping groove and the first boss, thereby preparing for the next measurement, avoiding the interference between the clamp block and the measured conductor during the transfer of the current sensor, and ensuring the smoothness and convenience of the measurement operation.

[0016] Preferably, the pushing block comprises a supporting part and a resilient part, the resilient part is made of elastic material, one side of the resilient part is connected with the driving ring, the other side of the resilient part is connected with the supporting part, the supporting part is slidingly installed in the matching groove, and the second inclined surface is located on the side wall of the supporting part close to the clamp block.

[0017] In the power system, the measured conductor has various specifications, which means that the diameter difference is large, and the Hall current sensor of the clamp structure needs to ensure the closure of the two wrenches during measurement, which leads to a fixed value of the sliding displacement of the clamp block, which makes the Hall current sensor of the clamp structure only measure the single diameter of the measured conductor, which limits the applicability of the Hall current sensor of the clamp structure. When the outer diameter of the measured conductor is greater than the minimum clamping diameter of the clamp block, therefore, by connecting the supporting part slidingly installed in the matching groove with the resilient part made of elastic material, the driving ring pushes the clamp block into contact with the measured conductor, and the driving ring pushes the axis of the measured conductor into coincidence with the axis of the threading hole. At this time, the clamp block and the supporting part stop moving, but the driving ring is still sliding. The driving force of the driving ring will extrude the resilient part. The resilient part is made of rubber material, which has the characteristics of wear resistance and high elasticity. Under the pressure of the driving ring, the resilient part deforms until the wrenches cooperate with each other. Through the sliding of the supporting part and the elastic design of the elastic part, the problem that the Hall current sensor of the clamp structure can only measure the single diameter of the measured conductor due to the fixed value of the sliding displacement of the clamp block is avoided, which improves the applicability of the Hall current sensor of the clamp structure for measuring different diameters of the measured conductor.

[0018] Preferably, a plurality of sliding grooves are formed on the side wall of the sliding cavity away from the axis of the threading hole, a plurality of connecting grooves are formed on the side wall of the driving ring away from the axis of the threading hole, the connecting grooves are in communication with the sliding grooves and the matching grooves, respectively, a plurality of clamping pins are slidingly arranged in the sliding cavities, the clamping pins are connected with the wrenches through the extension springs, a plurality of second clamping grooves are uniformly formed on the side wall of the supporting part away from the axis of the driving ring, a back-off groove is arranged on the side wall of the connecting groove, a chamfer is arranged on the side wall of the back-off groove, the chamfer is located on the side wall of the back-off groove away from the rotating shaft, and the clamping pins are slidingly matched with the chamfers of the second clamping grooves.

[0019] During the measurement process, due to external environmental factors, such as wind blowing, the measured conductor and the current sensor are shaken, the side wall of the measured conductor and the clamp block on the current sensor are extruded, the supporting part is pushed to extrude the rebound part, at this time the current sensor is displaced, the center of the measured conductor and the axis of the threading hole in the current sensor are deviated, which affects the measurement accuracy of the Hall current sensor with a clamp structure on the current, and the like physical quantities, therefore, a sliding groove is formed on the side wall of the sliding cavity, a clamping needle is slidingly installed in the sliding groove, the clamping needle is connected with the sliding groove through the extension spring, the sliding groove is connected with the matching groove through the connecting groove, a second clamping groove is formed on the supporting part, when the supporting part pushes the clamp block to contact the side wall of the measured conductor, and pushes the axis of the measured conductor to coincide with the axis of the threading hole, at this time the clamp block and the supporting part stop moving, the extension spring pushes the clamping needle to slide through the connecting groove to the matching groove in the sliding groove, and cooperates with the second clamping groove on the supporting part, thereby limiting the position of the supporting part, through the cooperation between the second clamping groove and the clamping needle, the problem that the side wall of the measured conductor and the clamp block on the current sensor are extruded, the supporting part is pushed to extrude the rebound part, the current sensor is displaced, the center of the measured conductor and the axis of the threading hole in the current sensor are deviated, which affects the measurement accuracy of the Hall current sensor with a clamp structure on the current, and the like physical quantities, is avoided, and the measurement accuracy of the Hall current sensor with a clamp structure is ensured.

[0020] Further, while the clamping needle and the second clamping groove are slidingly cooperated, the clamping needle and the chamfer are slidingly cooperated, through the sliding cooperation between the clamping needle and the chamfer, during the separation process between the two wrenches, the wrench is reversely rotated around the rotating shaft, thereby driving the driving ring to slide in the sliding cavity, the driving ring pushes the clamping needle to move into the sliding groove through the chamfer, at the same time, the clamping needle is separated from the second clamping groove, the position of the supporting part is released, the problem that the clamping needle interferes with the supporting part, and the clamp block cannot return to the wrench, is avoided.

[0021] Preferably, the clamp block comprises a driving part, a contact part and a parallel part, the driving part is slidingly installed in the matching groove, the driving part is slidingly connected with the supporting part on the side wall away from the axis of the threading hole, the driving part is perpendicularly connected with the side wall away from the axis of the threading hole on the side wall close to the axis of the threading hole, the side wall close to the axis of the wrench of the contact part is arc-shaped, and the diameter of the side wall is equal to the inner diameter of the wrench, the axial width of the contact part is equal to the axial thickness of the wrench, the parallel part is slidingly installed in the wrench, the parallel part is parallel to the driving part, and is connected with the side wall away from the axis of the wrench.

[0022] When the measured conductor is placed into the threading hole, the contact part is designed to have an axial width equal to that of the wrench, the contact area of the clamping block and the measured conductor is increased, the clamping block can constrain the measured conductor from more directions, and the slight deviation of the measured conductor in the radial direction is easier to be perceived and limited by the clamping block, the coincidence of the axis of the measured conductor and the axis of the threading hole is improved, the measurement error caused by the deviation of the axis is reduced, and the accuracy of the measurement of the Hall current sensor with the wrench structure is ensured.

[0023] Further, the worker will slide in the axial direction of the threading hole during the operation, the clamping block will rub against the measured conductor in the axial direction of the threading hole, the bending stress will be generated on the clamping block, the deformation of the clamping block will be caused, and the measurement accuracy of the current sensor will be affected.

[0024] Preferably, protrusions are arranged on the upper and lower end faces of the driving ring, the protrusions are semicircular, the protrusions are arranged in a ring shape and are uniformly distributed, protrusions with the same diameter are arranged in a group, the distance between the protrusions of adjacent two groups in the radial direction is equal, and the protrusions on the upper and lower end faces of the driving ring are at least in a group.

[0025] Through the design of the protrusions on the upper and lower end faces of the driving ring, the contact area of the upper and lower end faces of the driving ring and the sliding cavity is reduced, the reduction of the contact area is beneficial to the faster response speed of the driving ring when it is driven by external force, the uneven contact or excessive local friction during the sliding process of the driving ring can be effectively reduced, the sliding of the driving ring in the sliding cavity is smoother, the displacement and operation of the driving ring can be more accurately performed according to the design requirements, and the motion accuracy and reliability of the whole mechanism are improved.

[0026] Compared with the prior art, the present application has the following advantages:

[0027] 1、The present application is characterized in that the elastic potential energy of the driving spring is converted and the clamping block is driven to contact the measured conductor, and the axis of the measured conductor is pushed to the center of the threading hole, so that the axis of the measured conductor coincides with the axis of the threading hole, the deviation between the axis of the threading hole and the center of the measured conductor in the current sensor is avoided, the magnetic field distribution in the sensor is uniform, the measurement accuracy of the current sensor for physical quantities such as current is affected, and the measurement accuracy of the current sensor is ensured.

[0028] 2、The present application is through the design of the push block, the driving ring, the card needle and the telescopic spring, when the measured conductor outer diameter is greater than the minimum clamping diameter of the clamp block, the displacement amount of the clamp block can be adjusted following the size of the measured conductor outer diameter by the sliding of the supporting part and the extrusion of the elastic part deformation, at the same time, the design of the No. 2 clamping groove on the supporting part and the card needle cooperation limits the position of the supporting part, avoids the displacement of the clamp block due to vibration during use, causes the center of the wire hole axis in the current sensor to deviate from the measured conductor, ensures the accuracy of the current sensor measurement.

[0029] 3、The present application is through the design of the clamp block, through the design of the contact part along the axial width of the wrench equal to the axial width of the wrench, the contact area of the clamp block and the measured conductor is increased, so that the clamp block can constrain the measured conductor from more directions, reduces the measurement error caused by the conductor deviation, at the same time, the design of the driving part and the parallel part parallelly arranged makes the anti-bending ability of the clamp block in the axial direction of the wire hole enhanced, ensures the accuracy of the current sensor measurement. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is the structure schematic diagram of the current sensor in the open state of the application;

[0031] Figure 2 It is Figure 1 The partial enlarged view of A in the middle;

[0032] Figure 3 It is Figure 1 The partial enlarged view of B in the middle;

[0033] Figure 4 It is the structure schematic diagram of the current sensor in the closed state of the application;

[0034] Figure 5 It is Figure 4 The partial sectional view of D-D in the middle;

[0035] Figure 6 It is Figure 4 The partial enlarged view of C in the middle;

[0036] Figure 7 It is the explosion structure schematic diagram of the driving part of the driving assembly in the application;

[0037] Figure 8 It is the axial sectional view of the card needle and the driving assembly in the application.

[0038] In the figure: 1, the shell; 2, wrench; 21, a tooth; 22, sliding cavity; 23, drive ring; 231, arc-shaped slot; 232, second tooth; 24, matching slot; 25, push block; 251, support part; 252, rebound part; 253, second inclined surface; 254, second clamping groove; 255, first clamping groove; 256, connecting slot; 26, sliding slot; 261, clamping needle; 262, extension spring; 263, chamfer; 264, back-off groove; 27, protrusion; 3, drive spring; 4, rotating shaft; 41, third tooth; 5, button; 6, threading hole; 7, magnetic ring; 8, clamping block; 81, first inclined surface; 82, first boss; 83, drive part; 84, contact part; 85, parallel part; S1, back-off direction. DETAILED DESCRIPTION

[0039] Please refer to Figures 1 to 8 The application provides a current sensor, and the technical scheme is as follows:

[0040] A current sensor comprises a shell 1, a wrench 2, a drive spring 3 and a button 5, the number of the wrench 2 is 2, two rotating shafts 4 are symmetrically arranged in the shell, one end of each of the two wrenches 2 is rotatably arranged in the shell 1 through the two rotating shafts 4, and the other end of each of the two wrenches 2 extends out of the shell 1, when the two wrenches 2 are closed, the inner side wall forms a circular threading hole 6, the outer wall of one end of each of the two wrenches 2 arranged in the shell 1 is provided with a first tooth 21 which is in mesh with the first tooth 21 of the other wrench 2, the button 5 is connected with any one of the wrenches 2, the two ends of the button 5 are located on the inner and outer sides of the shell 1 respectively, one end of the button 5 arranged in the shell 1 is connected with the drive spring 3, the other end of the drive spring 3 is connected with the shell 1, and the drive spring 3 is in a compressed state when the two wrenches 2 are in an open state, characterized in that the wrench 2 is provided with a transmission assembly and three clamping blocks 8, the three clamping blocks 8 are slidingly arranged in the wrench 2 in a ring shape around the axis of the threading hole 6, and the sliding direction of each of the three clamping blocks 8 is directed to the axis of the threading hole 6, the clamping block 8 comprises a drive part 83, a contact part 84 and a parallel part 85, the drive part 83 is slidingly arranged in the matching slot 24, the side wall of the drive part 83 away from the axis of the threading hole 6 is slidingly connected with a support part 251, the side wall of the drive part 83 close to the axis of the threading hole 6 is perpendicularly connected with the side wall of the contact part 84 away from the axis of the threading hole 6, the side wall of the contact part 84 close to the axis of the wrench 2 is in a circular arc shape and has the same diameter as the inner side wall of the wrench 2, the axial width of the contact part 84 is equal to the axial thickness of the wrench 2, the parallel part 85 is slidingly arranged in the wrench 2, the parallel part 85 is arranged in parallel with the drive part 83 and connected with the side wall of the contact part 84 away from the axis of the wrench 2, a first inclined surface 81 is connected with the transmission assembly, and when the drive spring 3 releases elastic force, the elastic potential energy drives the clamping block 8 to slide towards the axis of the threading hole 6 through the transmission assembly.

[0041] Please refer to Figures 1 to 8The driving assembly comprises a driving ring 23 and three push blocks 25, the wrench is internally provided with a sliding cavity 22, the sliding cavity 22 is in the shape of a circular arc and coaxially arranged with the wrench, the driving ring 23 is slidingly installed in the sliding cavity 22, the driving ring 23 is provided with protrusions 27 on the upper and lower end faces, the protrusions 27 are in the shape of a semicircle, the protrusions 27 are annularly and uniformly arranged, the protrusions 27 of the same diameter are arranged in a group, the adjacent two groups of protrusions 27 are equally spaced in the radial direction, the protrusions 27 on the upper and lower end faces of the driving ring 23 are at least two groups, the driving ring 23 is coaxially provided with an arc-shaped groove 231, the rotating shaft 4 penetrates through the arc-shaped groove 231, a second gear tooth 232 is arranged on one side wall of the arc-shaped groove 231, a third gear tooth 41 is uniformly arranged on the outer wall of the rotating shaft 4 located in the arc-shaped groove 231, and the third gear tooth 41 is in mesh with the second gear tooth, three matching grooves 24 are arranged on the inner side wall of the driving ring 23, the three push blocks 25 are installed in the matching grooves 24, the three clamping blocks 8 are located in the matching grooves 24, the push block 25 is located on the side of the clamping block 8 close to the rotating shaft 4, the first inclined surface 81 is located on the side of the clamping block 8 close to the rotating shaft 4, the second inclined surface 253 is arranged on the side wall of the push block 25, the first inclined surface 81 and the second inclined surface 253 are in sliding connection, the first inclined surface 81 is provided with a first boss 82, a first clamping groove 255 is arranged on the second inclined surface 253, the cross sections of the first boss 82 and the first clamping groove 255 are in the shape of T, the first boss 82 is slidingly installed in the first clamping groove 255, the push block 25 comprises a supporting part 251 and a rebound part 252, the rebound part 252 is made of elastic material, one side of the rebound part 252 is connected with the driving ring 23, the other side of the rebound part 252 is connected with the supporting part 251, the supporting part 251 is slidingly installed in the matching groove 24, the second inclined surface 253 is located on the side wall of the supporting part 251 close to the clamping block 8, three sliding grooves 26 are arranged on the side wall of the sliding cavity 22 away from the axis of the threading hole 6, three connecting grooves 256 are arranged on the side wall of the driving ring 23 away from the axis of the threading hole 6, the three connecting grooves 256 are respectively in communication with the sliding grooves 26 and the matching grooves 24, three clamping needles 261 are slidingly arranged in the three sliding cavities 22, the clamping needles 261 are connected with the wrench 2 through the extension springs 262, N second clamping grooves 254 are uniformly arranged on the side wall of the supporting part 251 away from the axis of the driving ring 23, a return groove 264 is arranged on the side wall of the connecting groove 256, a chamfer 263 is arranged on the side wall of the return groove 264, the chamfer 263 is located on the side wall of the return groove 264 away from the rotating shaft 4, and the clamping needles 261 are slidingly matched with the second clamping grooves 254 and the chamfers 263.

[0042] Working principle: When measuring the conductor, manually press button 5. The drive spring 3 is compressed, increasing its elastic potential energy. During this process, the two wrenches 2 separate. The moving sensor moves the conductor through the opening into the wire hole 6. At this time, release button 5. The elastic potential energy of the drive spring 3 is released, pushing button 5 outward from the housing 1, causing one of the wrenches to rotate around the shaft 4. During this process, the two first teeth 21 on the two wrenches 2 mesh with each other. The wrench 2 connected to button 5 drives the other wrench 2 to rotate. Meanwhile, the other wrench 2 rotates around the axis of the internal rotating shaft 4. At this time, the two wrenches 2 are reconnected, and the wire hole 6 is closed. During the rotation of the wrench 2 around the rotating shaft 4, since the rotating shaft 4 is fixedly connected to the housing and passes through the arc groove 231 on the drive ring 23, the second tooth on the side wall of the arc groove 231 meshes with the third tooth 41 on the rotating shaft 4, and relative rotation occurs. The drive ring 23 slides in the sliding cavity 22. At this time, the sliding direction of the drive ring 23 is opposite to the retraction direction S1. The retraction direction S1 is... Figure 4 As shown, during the sliding process of the drive ring 23, the spring-loaded part 252 on the push block 25 moves within the mating groove 24, thereby driving the support part 251 connected to the spring-loaded part 252 to slide within the mating groove 24. Simultaneously, a second inclined surface 253 is provided on the side wall of the support part 251. The design of the second inclined surface 253 slidingly connected to the first inclined surface 81 on the side wall of the drive part 83 transforms the sliding of the support part 251 in the opposite direction of the retraction S1 into the sliding of the clamping block 8 within the mating groove 24 towards the axis of the wire hole 6. At the same time, the first slot 255 on the second inclined surface 253 and the first boss 82 on the first inclined surface 81 slide in cooperation, and the first... Both the boss 82 and the first slot 255 have T-shaped cross sections, allowing the clamping block 8 and the push block 25 to slide and engage. The push block 25 then restricts the sliding of the clamping block 8 in the sliding direction, preventing the clamping block 8 from disengaging from the wrench 2. During the sliding of the clamping block 8, the driving part 83 on the clamping block 8 slides in the mating groove 24, thereby driving the contact part 84 to slide towards the axis of the wire hole 6. At the same time, the parallel part 85 follows the contact part 84 to slide towards the axis of the wire hole 6. The contact part 84 contacts the outer wall of the conductor being measured, and under the push of the driving part 83, the axis of the conductor being measured coincides with the axis of the wire hole 6, thus ensuring the accuracy of the Hall current sensor measurement with the clamp-shaped structure.

[0043] Because the measured conductor specifications are not the same, there will be a measured conductor outer diameter greater than the minimum diameter of the clamp block 8, when the clamp block 8 pushes the measured conductor axis and the axis of the threading hole 6 coincides, under the support of the measured conductor outer wall, the clamp block 8 and the support part 251 stop moving, but the drive ring 23 is still sliding, at the same time, because the rebound part 252 is made of rubber material, it has the characteristics of wear resistance and high resilience, the driving force of the drive ring 23 will extrude the rebound part 252, and then make the rebound part 252 deform, which makes the pincer-shaped Hall current sensor can measure different diameter of the measured conductor, until the wrench 2 cooperate with each other, the drive ring 23 stop moving, when the wrench 2 is connected, the elastic potential energy of the extension spring 262 is released and pushes the clamping needle 261 to slide in the sliding groove 26, and comes to the connecting groove 256 and the matching groove 24, at this time the clamping needle 261 and the second clamping groove 254 on the support part 251 slide together, and then limit the position of the support part 251, avoid the influence of the outside, make the measured conductor side wall and the clamp block 8 on the current sensor extrude each other, and then push the support part 251 to extrude the rebound part 252, so that the current sensor is offset, in the process, the clamping needle 261 and the chamfer 263 in the back-off groove 264 are connected, at this time the two wrenches 2 form a closed threading hole 6, at this time the magnetic ring 7 is energized, and then a magnetic field is formed around the magnetic ring 7, at this time the current in the measured conductor passes through the magnetic field vertically, the electrons in the magnetic field are deflected by the Lorentz force, and a potential difference is generated in the direction perpendicular to the current and the magnetic field, and then the current is obtained by measuring the voltage difference.

[0044] When the measured conductor is to be replaced for measurement or the current sensor is to be collected, the button 5 is pressed to move into the shell 1, at this time the driving spring 3 is compressed, the elastic potential energy of the driving spring 3 is increased, and at the same time the button 5 drives one of the wrenches to rotate along the retreat direction S1 around the rotating shaft 4, in the process the mutual engagement of the two first teeth 21 on the two wrenches 2 drives the wrench 2 connected with the button 5 to rotate the other wrench 2, wherein the other wrench 2 rotates around the axis of the rotating shaft 4 arranged in the interior, at this time the two wrenches 2 are separated at the end outside the shell 1, at this time the threading hole 6 is open, in the process of rotating the wrench 2 along the retreat direction S1 around the rotating shaft 4, since the rotating shaft 4 is fixedly connected with the shell and the rotating shaft 4 passes through the arc-shaped groove 231 on the driving ring 23, at this time the second teeth on the sidewall of the arc-shaped groove 231 engage with the third teeth 41 on the rotating shaft 4 and rotate relatively, the driving ring 23 slides in the sliding cavity 22, at this time the sliding direction of the driving ring 23 is the same as the retreat direction S1, at this time the driving ring 23 pushes the clamping needle 261 matched therewith into the sliding groove 26 through the chamfer 263 in the retreat groove 264, thereby making the clamping needle 261 separate from the second clamping groove 254 and release the restriction on the supporting part 251, in the process of sliding the driving ring 23, the rebound part 252 on the push block 25 moves in the matching groove 24 along the retreat direction S1, thereby driving the supporting part 251 connected with the rebound part 252 to slide in the matching groove 24 along the retreat direction S1, at the same time the first clamping groove 255 on the second inclined surface 253 cooperates with the first protrusion 82 on the first inclined surface 81 to make the clamping block 8 and the push block 25 cooperate, the supporting part 251 drives the clamping block 8 to retreat to the wrench 2, thereby taking out the measured conductor from the threading hole 6 through the opening, and completing the replacement of the measured conductor for measurement or the collection of the current sensor.

[0045] The above describes one specific embodiment of the present application in detail in combination with the drawings, but the present application is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, replacements and variations of the embodiments without departing from the principles and ideas of the present application shall still fall within the protection scope of the present application.

Claims

1. A current sensor comprising a shell (1), a wrench (2), a driving spring (3) and a button (5), the number of the wrench (2) is 2, two rotation shafts (4) are symmetrically arranged in the shell (1), one end of the two wrenches (2) is rotatably installed in the shell (1) through the two rotation shafts (4) respectively, the other end of the two wrenches (2) extends to the outside of the shell (1), the inner side wall of the two wrenches (2) forms a circular threading hole (6) when the two wrenches (2) are closed, the outer wall of one end of the two wrenches (2) located in the shell (1) is provided with a first tooth (21) which is engaged with each other, the button (5) is connected with any wrench (2), the two ends of the button (5) are located on the inner and outer sides of the shell (1) respectively, and the end of the button (5) located in the shell is connected with the driving spring (3), the other end of the driving spring (3) is connected with the shell (1), and the driving spring (3) is in a compressed state when the two wrenches (2) are in an open state, characterized in that, The wrench (2) is internally provided with a transmission assembly and a plurality of clamping blocks (8). The plurality of clamping blocks (8) are slidingly installed in the wrench (2) around the axis of the threading hole (6) in a ring shape and the sliding direction is directed to the axis of the threading hole (6). One end of the clamping block (8) provided in the wrench (2) is provided with a first inclined surface (81). The first inclined surface (81) is connected with the driving assembly. When the driving spring (3) releases the elastic force, the elastic potential energy drives the clamping block (8) to slide towards the axis direction of the threading hole (6) through the transmission assembly.

2. A current sensor according to claim 1, characterized in that The driving assembly comprises a driving ring (23) and a plurality of push blocks (25). The wrench is internally provided with a sliding cavity (22). The sliding cavity (22) is in a circular arc shape and is coaxially arranged with the wrench. The driving ring (23) is slidingly installed in the sliding cavity (22). An arc-shaped groove (231) is coaxially arranged on the driving ring (23). The rotating shaft (4) penetrates through the arc-shaped groove (231). A second tooth (232) is arranged on one side wall of the arc-shaped groove (231). A plurality of third teeth (41) are uniformly arranged on the outer wall of the rotating shaft (4) in the arc-shaped groove (231) and are in meshing connection with the second tooth. A plurality of matching grooves (24) are arranged on the inner side wall of the driving ring (23). A plurality of push blocks (25) are installed in the matching grooves (24). A plurality of clamping blocks (8) are located in the matching grooves (24). The push block (25) is located on the side of the clamping block (8) close to the rotating shaft (4). The first inclined surface (81) is located on the side of the clamping block (8) close to the rotating shaft (4). A second inclined surface (253) is arranged on the side wall of the push block (25). The first inclined surface (81) and the second inclined surface (253) are in sliding connection.

3. A current sensor according to claim 2, wherein, A first boss (82) is arranged on the first inclined surface (81). A first clamping groove (255) is arranged on the second inclined surface (253). The cross sections of the first boss (82) and the first clamping groove (255) are in T shape. The first boss (82) is slidingly installed in the first clamping groove (255).

4. A current sensor according to claim 2, wherein, The push block (25) comprises a supporting part (251) and a rebound part (252). The rebound part (252) is made of elastic material. One side of the rebound part (252) is connected with the driving ring (23). The other side of the rebound part (252) is connected with the supporting part (251). The supporting part (251) is slidingly installed in the matching groove (24). The second inclined surface (253) is arranged on the side wall of the supporting part (251) close to the clamping block (8).

5. A current sensor according to claim 3, wherein The sliding cavity (22) is provided with a plurality of sliding grooves (26) on the side wall away from the axis of the threading hole (6), the driving ring (23) is provided with a plurality of connecting grooves (256) on the side wall away from the axis of the threading hole (6), the connecting grooves (256) are respectively communicated with the sliding grooves (26) and the matching grooves (24), a plurality of the sliding cavities (22) are slidably provided with clamping needles (261), the clamping needles (261) are connected with the wrench (2) through telescopic springs (262), the supporting portions (251) are uniformly provided with a plurality of second clamping grooves (254) on the side wall away from the axis of the driving ring (23), the connecting grooves (256) are provided with a retreat groove (264), the retreat groove (264) is provided with a chamfer (263) on the side wall, the chamfer (263) is located on the side wall away from the rotating shaft (4), and the clamping needles (261) are slidably matched with the chamfers (263) of the second clamping grooves (254).

6. A current sensor according to claim 4, wherein, The clamping block (8) comprises a driving portion (83), a contact portion (84) and a parallel portion (85), the driving portion (83) is slidably installed in the matching groove (24), the driving portion (83) is slidably connected with the supporting portion (251) on the side wall away from the axis of the threading hole (6), the driving portion (83) is perpendicularly connected with the contact portion (84) on the side wall close to the axis of the threading hole (6), the contact portion (84) is arc-shaped on the side wall close to the axis of the wrench (2) and has the same diameter as the inner side wall of the wrench (2), the contact portion (84) has the same axial width as the axial thickness of the wrench (2), and the parallel portion (85) is slidably installed in the wrench (2).

7. A current sensor according to claim 2, wherein The driving ring (23) is provided with protrusions (27) on the upper and lower end faces, the protrusions (27) are semicircular, the protrusions (27) are annularly and uniformly arranged, the protrusions (27) arranged with the same diameter are a group, the adjacent two groups of protrusions (27) have the same spacing in the radial direction, and the protrusions (27) on the upper and lower end faces of the driving ring (23) are at least two groups.

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