CN213581108U - Open type current sensor - Google Patents

Abstract

The utility model discloses an open current sensor, include the circular sensor insulating casing who has the threading inspection hole that comprises first semicircle casing and second semicircle casing, first semicircle casing is articulated with second semicircle casing one end, another looks remote site joint, articulated position is equipped with hinge means, when first semicircle casing rotates maximum angle position, first semicircle casing uses this articulated position as central symmetry point, with second semicircle casing central symmetry, first semicircle casing is equipped with fixed lock joint device with the free end of second semicircle casing, be equipped with first semicircle magnetic ring in the first semicircle casing, be equipped with second semicircle magnetic ring in the second semicircle casing, when first semicircle casing and second semicircle casing are in closed connection state, the tip clearance of first semicircle magnetic ring and second semicircle magnetic ring is 0.1 ~ 0.2 mm. The utility model discloses can avoid two semi-circular magnetic ring tip of articulated end department of two semi-circular casings problem of colliding, it is higher to detect the precision.

Description

Open type current sensor

Technical Field

The utility model relates to a current sensor technical field, concretely relates to open current sensor.

Background

The current detection technology is widely applied to the aspects of frequency converters, photovoltaic inversion, new energy and the like. The detection method generally includes a sampling resistance method and a current-magnetic field conversion method, and commonly used devices include an impedance shunt, a rogowski coil, a transformer, and a hall sensor. The impedance current divider is usually connected with a load in series, and the measured current is directly sampled for measurement, so that no isolation measurement is adopted; the mutual inductor and the Rogowski coil can only be used for detecting alternating current signals; the Hall sensors integrate the advantages of the Hall sensors, can be applied to electrical isolation measurement, can be used for detecting direct current and alternating current, and can detect various form currents. Due to the characteristics of the hall current sensor, the hall current sensor becomes the simplest and effective current detection means for measuring alternating current and direct current, and is widely applied to the current detection technology.

The working principle of the Hall sensor is as follows: firstly, a measured current penetrates through a magnetic core, a converted magnetic field acts on a Hall element arranged in the magnetic core through a magnetic core gap, the Hall element converts a signal of the magnetic field into a weak differential voltage signal through the Hall effect principle, and then the weak differential voltage signal is amplified and output through power, and the output current value reflects the condition of the measured current.

According to the structure form, the device comprises a closed current sensor and an open current sensor, wherein a threading detection port of the closed current sensor is fixed, and when the closed current sensor is used for detection, an electric wire or a cable needs to be disconnected firstly and then penetrates through the closed current sensor. The open type current sensor can open the threading detection port, and when the detection is carried out, the closed threading detection port is opened firstly, then the electric wire or the electric cable is loaded into the open threading detection port, and then the threading detection port is closed for detection, so that the electric wire or the electric cable does not need to be cut off. Therefore, the open current sensor is more suitable for current detection of outdoor power grid wires, and the existing open current sensor adopts a clamp type opening and closing structure, namely two semicircular shells are respectively provided with two semicircular magnets, one end of each semicircular shell rotates through a rotating shaft, the other end of each semicircular shell is clamped, and the rotating mode of each semicircular shell is as shown in a schematic diagram of fig. 1. There is a problem in that the gap of the magnet end portion of the hinge end is excessively large, having a large magnetic field loss, and the detection sensitivity needs to be corrected by an additional exciting coil and a gain circuit.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects existing in the prior art, the utility model provides an open type current sensor.

The utility model discloses realize that the technical scheme that above-mentioned technological effect adopted is:

an open-type current sensor comprises a circular sensor insulating shell which is composed of a first semicircular shell and a second semicircular shell and is provided with a threading detection hole, the first semicircular shell is hinged with one end of the second semicircular shell, the other opposite end is clamped, a hinge device is arranged at the hinged position, when the first semicircular shell rotates to the maximum angle position, the first semicircular shell takes the hinged position as a central symmetry point, is symmetrical with the center of the second semicircular shell, the free ends of the first semicircular shell and the second semicircular shell are provided with fixed buckling devices, a first semicircular magnetic ring is arranged in the first semicircular shell, a second semicircular magnetic ring is arranged in the second semicircular shell, when the first semicircular shell and the second semicircular shell are in a closed connection state, the end gap between the first semicircular magnetic ring and the second semicircular magnetic ring is 0.1-0.2 mm.

Preferably, in the open current sensor, the hinge device includes a first shaft seat disposed at one side of the hinge end of the first semicircular shell and a second shaft seat disposed at one side of the hinge end of the second semicircular shell, and the first shaft seat and the second shaft seat are located at the same side and are rotatably connected through a hinge shaft.

Preferably, in the open current sensor, the fixed fastening device includes a first fastening seat fixed to the free end of the first semicircular shell and a second fastening seat fixed to the free end of the second semicircular shell, the outer end of the first fastening seat is provided with a fastening arm formed by bending towards the second fastening seat in an integrated manner, and the outer end of the second fastening seat is located in a fastening groove of the fastening arm.

Preferably, in the open current sensor, a first concave arc surface is formed on a groove wall of the fastening groove corresponding to the outer end surface of the second fastening seat, a second convex arc surface adapted to the first concave arc surface is provided on the outer end surface of the second fastening seat, and the curvature radius of the first concave arc surface and the curvature radius of the second convex arc surface are the same as the curvature radius of the outer circumference of the sensor insulation housing in the closed connection state.

Preferably, in the open current sensor, the second semicircular magnetic ring is wound with a coil and provided with an air gap, a hall chip is arranged in the air gap, a circuit board connected with the hall chip is arranged in the second semicircular shell, and the circuit board is connected with a signal output interface on the second semicircular shell.

Preferably, in the open current sensor, fixing plates for fixing the magnetic ring are respectively arranged in the semicircular annular cavities of the first semicircular shell and the second semicircular shell, and the fixing plates are provided with fixing bayonets.

Preferably, in the open current sensor, an inner ring of the first semicircular shell is provided with one plastic elastic abutting contact, and an inner ring of the second semicircular shell is provided with two plastic elastic abutting contacts.

The utility model has the advantages that: the utility model discloses an open current sensor is through round hinge assembly with first semi-circular shell, the free end that makes its free end relative second semi-circular shell rotates at the coplanar dislocation formula, compare current jaw type mode that opens and shuts, it has avoided the problem that the tip of two semi-circular magnets of the articulated end department of first semi-circular shell and second semi-circular shell bumps, the relative second semi-circular shell of first semi-circular shell is 180 rotations in its articulated end department, can make both open the angle bigger, the tip of two upper and lower semi-circular magnetic rings can the relative setting of littleer interval.

Drawings

FIG. 1 is a schematic illustration of a prior art clamp-on current sensor when open;

fig. 2 is a rear view of the present invention;

FIG. 3 is an internal structural view of the present invention;

fig. 4 is a top view of the present invention corresponding to the first semicircular shell;

fig. 5 is a schematic structural view of the fastening device of the present invention;

fig. 6 is a schematic view of the fastening device of the present invention disposed at the outer end of the second fastening seat;

fig. 7 is a schematic view of the state of the present invention when the maximum angle is opened;

fig. 8 is a schematic view of the rotation path of the first semicircular shell when the maximum angle is opened according to the present invention.

Detailed Description

For a further understanding of the invention, reference is made to the following description taken in conjunction with the accompanying drawings and specific examples, in which:

in the description of the present application, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

As shown in fig. 2, for the embodiment of the present invention, an open type current sensor is proposed, which includes a circular sensor insulating housing 1 having a threading detection hole 10 and composed of a first semicircular housing 11 and a second semicircular housing 12. Wherein, first semicircle casing 11 is articulated with the one end of second semicircle casing 12, another looks remote site joint, and articulated position is equipped with hinge means 5. When the first semicircular shell 11 rotates to the maximum angle position, the first semicircular shell 11 is centrosymmetric with the second semicircular shell 12 by taking the hinge position as a centrosymmetric point. The free ends of the first semicircular shell 11 and the second semicircular shell 12 are provided with a fixing and buckling device 6, and when the free ends of the first semicircular shell 11 and the second semicircular shell 12 are opposite, the free ends of the first semicircular shell and the second semicircular shell are fixed through the fixing and buckling device 6. As shown in fig. 3, a first semicircular magnetic ring 2 is disposed in the first semicircular shell 11, a second semicircular magnetic ring 3 is disposed in the second semicircular shell 12, and when the first semicircular shell 11 and the second semicircular shell 12 are in a closed connection state, a gap between end portions of the first semicircular magnetic ring 2 and the second semicircular magnetic ring 3 is 0.1-0.2 mm. Through with first semicircle casing 11 round hinge means 5, make the relative free end of second semicircle casing 12 of its free end dislocation formula rotate on the coplanar, compare current pincers formula mode that opens and shuts, it has avoided the problem that the tip of two semicircular magnets of the articulated end department of first semicircle casing 11 and second semicircle casing 12 bumps, can make the tip of two upper and lower semicircular magnetic rings set up with littleer interval relatively.

Further, in the preferred embodiment of the present invention, as shown in fig. 2 and 4, the hinge device 5 includes a first shaft seat 51 disposed on one side of the hinge end of the first semicircular shell 11 and a second shaft seat 52 disposed on one side of the hinge end of the second semicircular shell 12, wherein the first shaft seat 51 and the second shaft seat 52 are located on the same side and are rotatably connected through a hinge shaft 53. Specifically, as shown in fig. 5 and 6, the fixing buckle device 6 includes a first buckle seat 61 fixed to the free end of the first semicircular shell 11 and a second buckle seat 62 fixed to the free end of the second semicircular shell 12. The outer end of the first fastening seat 61 is provided with a fastening arm 611 formed by integrally bending and bending towards the second fastening seat 62, and the outer end of the second fastening seat 62 is located in a fastening groove 610 of the fastening arm 611. As shown in fig. 6, the fastening groove 610 is formed with a first inner concave arc surface 6111 on a groove wall corresponding to the outer end surface of the second fastening seat 62, and the outer end surface of the second fastening seat 62 is provided with a second outer convex arc surface 621 matching with the first inner concave arc surface 6111. The radius of curvature of the first concave arc-shaped surface 6111 and the second convex arc-shaped surface 621 is the same as the radius of curvature of the outer circumference of the sensor insulation case 1 in the closed connection state. When the first semicircular shell 11 and the second semicircular shell 12 are opened by rotation, the first semicircular shell 11 is rotated by using the hinge shaft 53 as a rotating shaft towards one side. As shown in fig. 7 and 8, the path "S" is a rotation path of the first semicircular housing 11 at the maximum angle position where the first semicircular housing 11 is opened with respect to the second semicircular housing 12. Compared with the rotation path "S0" of the clamp-type opening and closing current sensor shown in fig. 1, the rotation path "S" of the present invention can be regarded as an offset translation rotation.

Further, as shown in fig. 3, a coil 4 is wound on the second semicircular magnetic ring 3 and an air gap 31 is provided, and a hall chip 32 is provided in the air gap 31. The second semicircular shell 12 is provided with a circuit board connected with the hall chip 32, and the circuit board is connected with the signal output interface 8 on the second semicircular shell 12. The semicircular ring cavities of the first semicircular shell 11 and the second semicircular shell 12 are respectively provided with a fixing plate 9 for fixing a magnetic ring, and the fixing plate 9 is provided with a fixing bayonet. In order to keep the wire or cable to be detected at the center position of the threading detection hole 10, the inner ring of the first semicircular shell 11 is provided with one plastic elastic abutting contact 7, the inner ring of the second semicircular shell 12 is provided with two plastic elastic abutting contacts 7, the wire or cable to be detected can be kept at the center position of the threading detection hole 10 through the plastic elastic abutting contacts 7, and the accuracy of current detection is improved. In the preferred embodiment of the present invention, the hall chip 32 is a single-ended output linear hall sensor chip with the model of DS-CC 6501.

To sum up, the utility model discloses an open current sensor makes the relative second semicircle casing's of its free end dislocation formula rotate on the coplanar through round hinge means with first semicircle casing, compares current jaw type mode that opens and shuts, and it has avoided the problem of the tip of two semi-circular magnets of the articulated end department of first semicircle casing and second semicircle casing collision, and the relative second semicircle casing of first semicircle casing is 180 rotations in its articulated end department, can make both open the angle bigger, and the tip of two upper and lower semi-circular magnetic rings can the relative setting of littleer interval.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, but rather is described in the foregoing embodiments and the description with reference to the principles of the invention and that various changes and modifications may be made without departing from the spirit and scope of the invention, and it is intended that all such changes and modifications fall within the scope of the invention as claimed, which is defined by the claims appended hereto and their equivalents.

Claims (7)

1. An open type current sensor is characterized by comprising a circular sensor insulating shell (1) which is composed of a first semicircular shell (11) and a second semicircular shell (12) and is provided with a threading detection hole (10), wherein the first semicircular shell (11) is hinged with one end of the second semicircular shell (12), the other opposite end is clamped, a hinge device (5) is arranged at the hinged position, when the first semicircular shell (11) rotates to the maximum angle position, the first semicircular shell (11) takes the hinged position as a central symmetry point and is centrosymmetric with the second semicircular shell (12), a fixed fastening device (6) is arranged at the free end of the first semicircular shell (11) and the free end of the second semicircular shell (12), a first semicircular magnetic ring (2) is arranged in the first semicircular shell (11), a second semicircular magnetic ring (3) is arranged in the second semicircular shell (12), when the first semicircular shell (11) and the second semicircular shell (12) are in a closed connection state, the end gap between the first semicircular magnetic ring (2) and the second semicircular magnetic ring (3) is 0.1-0.2 mm.

2. Open current sensor according to claim 1, characterised in that said hinge means (5) comprise a first axial seat (51) arranged on the side of the hinge end of said first semi-circular housing (11) and a second axial seat (52) arranged on the side of the hinge end of said second semi-circular housing (12), said first axial seat (51) being located on the same side as said second axial seat (52) and being rotatably connected by a hinge axis (53).

3. The open current sensor according to claim 1, wherein the fastening device (6) comprises a first fastening seat (61) fixed at the free end of the first semicircular shell (11) and a second fastening seat (62) fixed at the free end of the second semicircular shell (12), the outer end of the first fastening seat (61) is provided with a fastening arm (611) formed by bending towards the second fastening seat (62) in an integral forming manner, and the outer end of the second fastening seat (62) is located in a fastening groove (610) of the fastening arm (611).

4. The open current sensor according to claim 3, wherein the fastening groove (610) is formed with a first inner concave arc surface (6111) on a groove wall corresponding to the outer end surface of the second fastening seat (62), the outer end surface of the second fastening seat (62) is provided with a second outer convex arc surface (621) matched with the first inner concave arc surface (6111), and the radius of curvature of the first inner concave arc surface (6111) and the radius of curvature of the second outer convex arc surface (621) are the same as the radius of curvature of the outer circumference of the sensor insulation housing (1) in the closed connection state.

5. The open type current sensor as claimed in claim 1, wherein the second semicircular magnetic ring (3) is wound with a coil (4) and provided with an air gap (31), a hall chip (32) is arranged in the air gap (31), a circuit board connected with the hall chip (32) is arranged in the second semicircular shell (12), and the circuit board is connected with a signal output interface (8) on the second semicircular shell (12).

6. The open type current sensor according to claim 1, wherein the semicircular cavities of the first semicircular shell (11) and the second semicircular shell (12) are respectively provided with a fixing plate (9) for fixing the magnetic ring, and the fixing plate (9) is provided with a fixing bayonet.

7. Open current sensor according to claim 1, characterized in that the inner ring of the first semicircular housing (11) is provided with one plastic elastic abutment contact (7) and the inner ring of the second semicircular housing (12) is provided with two plastic elastic abutment contacts (7).

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