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CN-121995100-A - Clamp ammeter for detecting residual current

CN121995100ACN 121995100 ACN121995100 ACN 121995100ACN-121995100-A

Abstract

The invention relates to the technical field of clamp-on ampere meters, in particular to a clamp-on ampere meter for detecting residual current, which comprises a residual current handheld meter body and a residual current sensor, wherein a wiring is arranged between the residual current handheld meter body and the residual current sensor. The structure of the fixed annular jaw and the movable annular jaw is optimally designed, a jaw closing mechanism is integrated at the jaw end closing position and is combined with the negative pressure attaching assembly, so that the jaw is ensured to be completely and tightly attached when being closed, the problems that a tiny gap exists, a magnetic circuit is incomplete, and the uniformity and the measurement accuracy of a magnetic field are affected are avoided.

Inventors

  • MA YONGCHUN

Assignees

  • 南京广创科技有限公司

Dates

Publication Date
20260508
Application Date
20260310

Claims (10)

  1. 1. A clamp-on ammeter for detecting residual current comprises a residual current handheld meter body (1) and a residual current sensor (2), wherein a wiring (12) is arranged between the residual current handheld meter body (1) and the residual current sensor (2), the clamp-on ammeter is characterized in that the residual current sensor (2) comprises a body mounting mechanism and a clamp head magnetic core mechanism, the body mounting mechanism consists of a first mounting shell (21), a second mounting shell (22), a fixed annular jaw (23) and a movable annular jaw (24), the fixed annular jaw (23) and the movable annular jaw (24) are arranged on the inner sides of the first mounting shell (21) and the second mounting shell (22), the lower end of the movable annular jaw (24) is rotationally connected with the fixed annular jaw (23) through a pin shaft, the clamp head magnetic core mechanism consists of a magnetic core assembly (4), a magnetic core mounting frame (41), a Hall element (42) and a fastening bolt (43), the magnetic core assembly (4) is provided with two groups and is respectively arranged in the inner sides of the fixed annular jaw (23) and the movable annular jaw (24), a protection cavity (230) is formed in the inner sides of the fixed annular jaw (23) and the movable annular jaw (24), the magnetic core protection mechanism comprises an annular protection cover plate (3) and a negative pressure attaching assembly.
  2. 2. The clamp-on ammeter for residual current detection according to claim 1, wherein a jaw closing mechanism is arranged at the upper ends of the fixed annular jaw (23) and the movable annular jaw (24), the jaw closing mechanism comprises a joint plate (231), the joint plate (231) is fixedly arranged at a joint of the upper ends of the fixed annular jaw (23) and the movable annular jaw (24), and a joint guide gap (2300) is formed in the inner side of the joint plate (231).
  3. 3. The clamp ammeter for detecting residual current, as set forth in claim 2, wherein the jaw closing mechanism further comprises a guide post (240), the guide post (240) is fixedly installed at one end of the movable annular jaw (24) far away from the clamp head trigger (241), a V-shaped frame (2401) is fixedly connected to the outer surface of one side of the guide post (240), a guide trolley (2402) is rotatably installed at the other end of the V-shaped frame (2401), and the outer surface of the guide trolley (2402) is movably abutted against the inner wall of the engagement guide gap (2300).
  4. 4. The clamp-on ammeter for residual current detection according to claim 3, wherein the annular protective cover plate (3) is provided with four groups, every two groups of annular protective cover plates (3) are formed into one group and are distributed on two sides of the fixed annular jaw (23) and the movable annular jaw (24) in parallel through bolts, the negative pressure attaching assembly comprises a negative pressure channel (31) and an arc-shaped contact bag (32), one side outer surface of the arc-shaped contact bag (32), far away from the negative pressure channel (31), is movably abutted against the outer surface of the guide post (240), the negative pressure channel (31) penetrates through the inner wall of the annular protective cover plate (3), a micro vacuum pump is arranged at the input end of the negative pressure channel (31), and the output end of the negative pressure channel (31) is fixedly connected with one side, far away from the guide post (240), of the arc-shaped contact bag (32).
  5. 5. The clamp-on ammeter for residual current detection according to claim 4, wherein negative suction holes (320) are uniformly formed in the inner wall of one side of the arc-shaped contact bag (32) close to the guide post (240), and elastic pieces (33) are fixedly arranged on the inner cavity side wall of the arc-shaped contact bag (32).
  6. 6. The clamp-on ammeter for residual current detection according to claim 5, wherein parallel connection assemblies are arranged on two sides of the arc-shaped contact bag (32), each parallel connection assembly comprises an outer guide side plate (30) and an inner protection side plate (301), the outer guide side plates (30) and the inner protection side plates (301) are fixedly connected with the upper ends of the annular protection cover plates (3) respectively, guide grooves (300) are formed in the inner side surfaces of the outer guide side plates (30), and the inner surfaces of the guide grooves (300) are movably connected with the outer surfaces of the guide columns (240).
  7. 7. The clamp-on ammeter for residual current detection according to claim 1, wherein the inner annular surfaces of the fixed annular jaw (23) and the movable annular jaw (24) are provided with filling grooves, the inner surfaces of the filling grooves are movably clamped with the outer surfaces of the Hall elements (42), the overlook cross section of the Hall elements (42) is of a T-shaped platy structure, and the inner side surface of the Hall elements (42) is movably abutted with one side surface of the magnetic core mounting frame (41).
  8. 8. A clamp ammeter for residual current detection according to claim 7 is characterized in that the fastening bolt (43) penetrates through the Hall element (42) and the inner wall of the magnetic core mounting frame (41) and is in threaded connection with the Hall element and the inner wall of the magnetic core mounting frame (41), a central hole is formed in the central inner surface of the fastening bolt (43), and staggered drying sheets (431) are distributed on the inner wall of the central hole in a staggered mode.
  9. 9. The clamp-on ammeter for residual current detection according to claim 8, wherein the inner side surface of the magnetic core mounting frame (41) is of a U-shaped groove body structure, the inner side surface of the magnetic core mounting frame (41) is movably clamped with the outer surface of the magnetic core assembly (4), an annular channel (410) and a side channel (4101) are formed in the inner wall of the magnetic core mounting frame (41), the annular channel (410) and the side channel (4101) are communicated with each other, a heat conducting filling sheet (411) is movably clamped on the inner side surface of the side channel (4101), and the inner side surfaces of the heat conducting filling sheets (411) are respectively movably contacted with the outer surface of the magnetic core assembly (4).
  10. 10. The clamp-on ammeter for residual current detection according to claim 9, wherein a flow round hole (430) is formed in one end of the inner side of the fastening bolt (43), the flow round hole (430) is communicated with the center hole, the flow round hole (430) is butted with the input end of the annular channel (410), and a C-shaped groove (4102) is formed in the output end of the annular channel (410).

Description

Clamp ammeter for detecting residual current Technical Field The invention relates to the technical field of clamp-on ampere meters, in particular to a clamp-on ampere meter for detecting residual current. Background In the operation and maintenance process of the power system, the detection of the residual current is critical, the residual current is possibly generated due to insulation damage of electrical equipment, line leakage and other reasons, if the residual current is not detected and processed in time, potential safety hazards such as electrical fire and electric shock accidents can be caused, and the traditional current detection method has various inconveniences when the detection of the residual current is faced, such as the need of circuit breaking for detection, which not only affects normal power supply, but also increases operation complexity and safety risk, therefore, the clamp ammeter can detect the current without circuit breaking, is widely applied in the field of residual current detection, can detect the circuit in operation quickly and conveniently, discover potential leakage problems in time, and ensure the safe and stable operation of the power system. In the prior art, as a convenient residual current detection device is disclosed as CN210181114U, the side wall of the shell is provided with a change-over switch, the change-over switch is electrically connected with the circuit board, the change-over switch is provided with a first gear and a second gear, the detection jaw works when the change-over switch is switched to the first gear, the Rogowski coil works when the change-over switch is switched to the second gear, so that the detection jaw and the Rogowski coil of the residual current detection device can work independently, namely, the residual current detection device has two detection functions, the versatility of the residual current detection device is greatly improved, and the detection convenience of a clamp ammeter and the maintenance convenience of maintenance personnel can be well improved. In the practical use process, the existing fixed pliers and movable embedded structure are single, abrasion is easy to occur at the jaw under long-time opening and closing operation, complete close fitting cannot be guaranteed when closing is achieved, a tiny gap exists, a magnetic circuit is incomplete, uniformity and detection precision of a magnetic field are affected, a magnetic core assembly generates heat due to resistance after being electrified by a coil wound on the surface of the magnetic core assembly in the working process, the traditional jaw is difficult to realize heat dissipation, and therefore the magnetic core is in a high-temperature state, and service life of a clamp ammeter is affected. Therefore, the invention provides a clamp ammeter for detecting residual current, which solves the problems that the prior clamp ammeter has a single structure and cannot ensure complete close fit when closed, so that a magnetic circuit is incomplete. Disclosure of Invention In view of the shortcomings of the prior art, the present invention aims to provide a clamp ammeter for detecting residual current, so as to solve the problems set forth in the background art. The clamp-on ammeter for detecting residual current comprises a residual current handheld meter body and a residual current sensor, wiring is arranged between the residual current handheld meter body and the residual current sensor, the residual current sensor comprises a body mounting mechanism and a clamp head magnetic core mechanism, the body mounting mechanism comprises a first mounting shell, a second mounting shell, a fixed annular jaw and a movable annular jaw, the fixed annular jaw and the movable annular jaw are arranged on the inner sides of the first mounting shell and the second mounting shell, the lower end of the movable annular jaw is rotationally connected with the fixed annular jaw through a pin shaft, the clamp head magnetic core mechanism comprises a magnetic core assembly, a magnetic core mounting frame, a Hall element and a fastening bolt, the magnetic core assembly is provided with two groups and is respectively arranged in the fixed annular jaw and the movable annular jaw, magnetic core mounting cavities are respectively formed in the inner walls of the fixed annular jaw and the movable annular jaw, the magnetic core mounting cavities are internally provided with magnetic core protection mechanisms, and the magnetic core protection mechanisms comprise annular protection cover plates and negative pressure laminating assemblies. Preferably, the upper ends of the fixed annular jaw and the movable annular jaw are provided with jaw closing mechanisms, each jaw closing mechanism comprises a connecting plate, each connecting plate is fixedly arranged at the joint of the upper ends of the fixed annular jaw and the movable annular jaw, and a connecting guide gap is formed in the inner side of each conne