Wire protection frame and Hall current sensor

Abstract

The utility model relates to the technical field of electromagnetic induction, in particular to a lead protection frame and a Hall current sensor, the lead protection frame comprises an isolation part and an installation part, the isolation part is used for forming a lead protection structure, the installation part is used for being detachably arranged on an installed part of the Hall current sensor, and the Hall current sensor is arranged on the installation part. The lead protection frame is detachably arranged on the mounted piece by means of the mounting part and forms a part of the Hall current sensor; the Hall current sensor is provided with the lead protection frame. According to the utility model, the wire protection frame is detachably installed on the installed part of the Hall current sensor, so that the wire protection frame is detachably installed, and the disassembly and assembly of the annular magnetic core and other parts of the Hall current sensor are facilitated; the wire protection frame is detachably installed on the framework, so that glue is poured between the framework and the first magnetic core to form bonding fixation, and physical isolation can be formed between the glue and the to-be-tested wire so as to prevent the to-be-tested wire from being in contact with the glue.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic induction technology, specifically to a wire protection frame and a Hall current sensor. Background Technology

[0002] A Hall current sensor is a sensor that uses the Hall principle to measure current. Its measurement principle is as follows: An external power supply is connected to the Hall element, creating conductive charge carriers (positive load carriers) within the element. These positive load carriers are deflected by the Lorentz force under the influence of the magnetic field generated by the measured current (primary current), accumulating on both sides of the Hall element to form a potential difference. According to the Hall voltage calculation formula UH = RH * I * B / δ, the magnitude of UH is related to the magnetic field strength B, which is determined by the magnitude of the measured current (primary current). Therefore, by measuring UH, the magnitude of the measured current can be calculated, thus achieving current measurement. Thus, the Hall element does not need to directly contact the conductor being measured to measure the current. To measure the magnitude of the measured current, the Hall element is placed in the air gap of a toroidal magnetic core. The conductor being measured is axially inserted through the inside of the toroidal core. The toroidal core concentrates the magnetic flux generated by the measured current at the air gap. The Hall element at the air gap senses the magnetic flux of the measured current, forming a Hall voltage. The magnitude of the Hall voltage is then output through amplifiers and other components, thereby calculating the magnitude of the measured current (primary current).

[0003] To ensure the isolation withstand voltage between the test lead and the Hall element, an insulated lead protection structure is provided between them. The lead protection structure of existing Hall current sensors on the market is formed as part of a plastic skeleton. That is, the existing lead protection structure is a fixed structure that cannot be disassembled, which is not conducive to the disassembly and assembly of the magnetic core. Summary of the Invention

[0004] The purpose of this invention is to provide a wire protection frame and a Hall current sensor to solve the problem that existing wire protection structures are not removable.

[0005] To achieve the above objectives, the technical solution of this utility model includes: a wire protection frame, comprising an isolation part and a mounting part, wherein the isolation part is used to form a wire protection structure, and the mounting part is used to be detachably disposed on the mounted part of a Hall current sensor, and the wire protection frame is detachably disposed on the mounted part by means of the mounting part and forms part of the Hall current sensor.

[0006] In one embodiment, the mounting portion includes a plurality of snap fasteners disposed on one side of the isolation portion, thereby allowing the wire protection bracket to be detachably snapped onto the mounted component.

[0007] In one embodiment, a plurality of the clips are spaced apart around the isolation portion, thereby forming a multi-point connection between the wire protection frame and the installed component, and the multiple connection points formed by the multi-point connection are located around the isolation portion.

[0008] In one embodiment, the mounting portion includes an extension arm, and the latch is disposed at the end of the extension arm remote from the isolation portion.

[0009] In one embodiment, the device further includes a plurality of positioning portions disposed around the isolation portion. The plurality of positioning portions are used to cooperate with the mounted component to form multi-point positioning of the wire protection frame, thereby stably installing the wire protection frame on the mounted component.

[0010] In one embodiment, the positioning part includes a slit structure, the slit structure including a first positioning surface and a second positioning surface that are perpendicular to each other, the first positioning surface being perpendicular to the installation direction of the wire protection frame, the first positioning surface being used to cooperate with the mounted component to position the wire protection frame in the installation direction, and the second positioning surface being used to cooperate with the mounted component to position the wire protection frame perpendicular to the installation direction.

[0011] In one embodiment, there are four positioning parts, each further comprising a positioning block structure. One side of the positioning block structure forms a second positioning surface. The positioning block structure also includes a third positioning surface perpendicular to the first positioning surface and the second positioning surface. The second positioning surface and the third positioning surface are respectively used to cooperate with the installed component to form the four corner positioning of the wire protection frame.

[0012] In one embodiment, the isolation portion has an arc-shaped surface, which is used to mount the conductor to be tested.

[0013] The technical solution of this utility model also includes: a Hall current sensor, comprising a mounting component and the aforementioned wire protection frame, wherein the mounting component is provided with a mating part, and the mating part is detachably connected to the mounting part of the wire protection frame.

[0014] In one embodiment, the mounted component is a skeleton for mounting at least a portion of a toroidal magnetic core.

[0015] In one embodiment, at least two first magnetic cores are mounted on the skeleton, the first magnetic cores are spliced ​​together to form part of the annular magnetic core, the skeleton is provided with a glue injection groove, the glue injection groove is used to pour glue to bond and fix the skeleton and the first magnetic cores together, and the isolation part of the wire protection frame covers the glue injection groove.

[0016] The beneficial effects of this utility model are:

[0017] 1. The wire protection frame is detachably installed on the mounting part of the Hall current sensor, so that the wire protection frame can be detachably installed, which is beneficial to the disassembly and assembly of the toroidal magnetic core and other parts of the Hall current sensor.

[0018] 2. The snap-fit ​​connection structure is simple and easy to disassemble. The snap-fit ​​is located at the end of the extension arm, which can reduce the difficulty of disassembling and assembling the wire protection frame by means of the deformation of the extension arm, which is beneficial to the disassembly and assembly of the wire protection frame.

[0019] 3. Multiple positioning parts and buckles are provided, which enables the conductor protection frame to form multi-point connection and multi-point positioning, which is conducive to the stable installation of the conductor protection frame.

[0020] 4. The isolation section is provided with an arc-shaped surface to contact the wire to be tested, so that the inside of the toroidal core has an arc-shaped contact surface that matches the wire to be tested. This reduces the shape requirements of the toroidal core cross section, that is, the toroidal core is not limited to a toroidal shape, and can also be other toroidal shapes, such as square rings or other polygonal rings, which is beneficial to the installation and fixation of the toroidal core.

[0021] 5. The wire protection frame can be detachably installed on the frame, which facilitates the pouring of adhesive between the frame and the first magnetic core to form an adhesive bond. It can also form a physical isolation between the adhesive and the wire under test to prevent the wire under test from contacting the adhesive. Attached Figure Description

[0022] Figure 1 This is an exploded view of the Hall current sensor according to an embodiment of the present invention.

[0023] Figure 2 This is a left view of the Hall current sensor according to an embodiment of the present invention.

[0024] Figure 3 yes Figure 2 AA sectional view.

[0025] Figure 4 This is a three-dimensional wire protection frame according to an embodiment of the present utility model. Figure 1 .

[0026] Figure 5 This is a three-dimensional wire protection frame according to an embodiment of the present utility model. Figure 2 .

[0027] Figure 6 This is a three-dimensional view of the skeleton of an embodiment of this utility model.

[0028] Figure 7 This is a perspective view of the connection structure of the skeleton, the first magnetic core, and the wire protection frame in an embodiment of this utility model.

[0029] Figure 8This is a front view of the connection structure of the skeleton, the first magnetic core, and the wire protection frame in an embodiment of this utility model.

[0030] The components include: 10 wire protection frame, 11 isolation part, 12 mounting part, 121 buckle, 122 extension arm, 13 positioning part, 131 slit structure, 132 positioning block structure, 133 first positioning surface, 134 second positioning surface, 135 third positioning surface, 20 ring magnetic core, 201 air gap, 21 first magnetic core, 22 second magnetic core, 30 Hall element, 40 frame, 41 mating part, 42 positioned part, 421 first mating surface, 422 second mating surface, 43 glue injection groove, 44 glue outlet, 50 top cover, and 60 base. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings. These drawings are part of the disclosure of the present invention and are mainly used to illustrate the embodiments, and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementations and the advantages of the present invention. Components in the drawings are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0032] See Figures 1 to 3 As shown, this utility model discloses a wire protection frame 10 and a Hall current sensor having the wire protection frame 10. The Hall current sensor includes a ring magnetic core 20. The radial inner side of the ring magnetic core 20 is used to pass through the wire to be tested. The magnetic flux generated by the current of the wire to be tested (i.e., the "current to be tested") is collected through the ring magnetic core 20 and concentrated at the air gap 201. The Hall element 30 at the air gap 201 senses the magnetic flux of the current to be tested and forms a Hall voltage. The magnitude of the Hall voltage is then output through components such as an amplifier, thereby calculating the magnitude of the current to be tested. A portion of the wire protection frame 10 is disposed within the ring magnetic core 20 to form a wire protection structure. The wire protection structure is a structure disposed between the wire to be tested and the Hall element 30 to form a physical isolation structure, preventing the wire to be tested from directly contacting the Hall element 30 and the ring magnetic core 20, which is beneficial to the isolation withstand voltage of the wire to be tested.

[0033] The annular magnetic core 20 includes two first magnetic cores 21 disposed on the frame 40 and a second magnetic core 22 disposed on the upper cover 50. The first magnetic cores 21 and the second magnetic cores 22 are joined together to form the annular magnetic core 20, and an air gap 201 is formed between the two first magnetic cores 21. After the first magnetic cores 21 are installed on the frame 40, the two are jointly installed in the base 60.

[0034] See Figures 4 to 8As shown, the wire protection frame 10 includes an isolation portion 11 and a mounting portion 12. The isolation portion 11 forms a wire protection structure, and the mounting portion 12 is detachably mounted on the mounting component of the Hall current sensor. The wire protection frame 10 is detachably mounted on the mounting component by means of the mounting portion 12 and forms part of the Hall current sensor. Detachably mounting the wire protection frame 10 to the mounting component of the Hall current sensor allows for detachable mounting, facilitating the assembly and disassembly of the toroidal magnetic core and other components of the Hall current sensor.

[0035] The following description uses the Hall current sensor frame 40 as an example to illustrate the structure of the wire protection frame 10 and its connection with the mounted component. Besides the frame 40, the mounted component can also be other parts of the Hall current sensor, such as the base 60, the top cover 50, etc.

[0036] The mounting part 12 includes multiple latches 121 disposed on one side of the isolation part 11. The frame 40 is provided with a mating part 41 for the latches 121 to engage. The latches 121 engage with the mating part 41, thereby the wire protection frame 10 is detachably attached to the frame 40. The wire protection frame 10 forms a detachable engagement with the frame 40 using the latches 121, which is simple in structure and easy to assemble and disassemble. The multiple latches 121 are spaced apart around the isolation part 11, thereby forming a multi-point connection between the wire protection frame 10 and the frame 40, and the multiple connection points formed by the multi-point connection are located around the isolation part 11. The frame 40 has multiple thin walls disposed around the first magnetic core 21, and the ends of the thin walls form mating parts 41. In this example, there are four latches 121, and the four connection points formed are located at the four corners of the isolation part 11. In other embodiments, the number of latches 121 can also be other, such as two, three or more. The conductor protection frame 10 forms multiple connections around the isolation part 11, which is conducive to the reliable installation of the conductor protection frame 10 and prevents the conductor protection frame from falling off.

[0037] Continue reading Figures 4 to 8 As shown, the mounting part 12 in this example includes an extension arm 122, and a buckle 121 is located at the end of the extension arm 122 away from the isolation part 11. During the snap-fit ​​and disassembly process of the wire protection frame 10, the extension arm 122 has a certain elastic deformation, which makes it easier for the buckle 121 to be snapped up and disassembled relative to the frame 40.

[0038] In other embodiments, the wire protection frame 10 can be connected to the frame 40 by other detachable connection methods, such as threaded connection.

[0039] Since the wire protection frame 10 is detachably installed on the frame 40, compared to a fixed installation, the wire protection frame 10 is prone to instability and shaking. To make the installation of the wire protection frame 10 more stable, four positioning parts 13 are provided between the isolation part 11 and the mounting part 12. The positioning parts 13 are used to cooperate with the frame 40 to form multi-point positioning of the wire protection frame 10, thereby making the wire protection frame 10 stably installed on the frame 40. In this embodiment, the positioning part 13 includes a slit structure 131 and a positioning block structure 132. The slit structure 131 includes a first positioning surface 133 and a second positioning surface 134 that are perpendicular to each other. The first positioning surface 133 is perpendicular to the installation direction of the wire protection frame 10, that is, perpendicular to the extension direction of the extension arm 122. The first positioning surface 133 is used to cooperate with the frame 40 to position the wire protection frame 10 in the installation direction, and the second positioning surface 134 is used to cooperate with the frame 40 to position the wire protection frame 10 perpendicular to the installation direction. One side of the positioning block structure 132 forms a second positioning surface 134. The positioning block structure 132 also includes a third positioning surface 135 perpendicular to the first positioning surface 133 and the second positioning surface 134. The second positioning surface 134 and the third positioning surface 135 are used to mate with the frame 40 to form the four corner positioning of the wire protection frame 10. More specifically, during installation, the first positioning surface 133 abuts against the first mating surface 421 of the frame 40, and the second positioning surface 134 and the third positioning surface 135 respectively form a fit with a narrow gap (referred to as "gap fit") with the two second mating surfaces 422 of the frame 40. The first mating surface 421 and the two second mating surfaces 422 of the frame 40 form the positioning part 42 of the frame 40. There are four positioning parts 42, which provide four corner positioning for the wire protection frame 10 in the installation direction and in a plane perpendicular to the installation direction. The second positioning surface 134 and the third positioning surface 135 form a clearance fit with the second mating surface 422, which facilitates the insertion of the wire protection frame 10 into the frame 40 during installation. This is because, in the installation direction, there is a small gap between the wire protection frame 10 and the frame 40, allowing the wire protection frame 10 to be smoothly inserted. The abutting fit between the first positioning surface 133 and the first mating surface 421 during installation is to ensure that the snap-fit ​​121 of the wire protection frame 10 can smoothly engage with the mating part 41 of the frame 40. However, during use, it is not limited whether the first positioning surface 133 and the first mating surface 421 form an abutting fit or a clearance fit. In the clearance fit, the specific value of the small gap between the two surfaces forming the clearance fit is determined by those skilled in the art based on the actual situation, with the aim of ensuring that the wire protection frame 10 can be installed smoothly and is not prone to shaking after installation. No specific limitation is made here.

[0040] In this embodiment, the four positioning parts 13 are distributed around the isolation part 11. In other embodiments, there may be one positioning part 13, that is, a slit structure and a positioning block structure are used to form a stable installation of the wire protection frame 10; there may also be multiple positioning parts 13, such as three, which are distributed around the isolation part 11, so that the positioning surfaces or positioning points formed by each positioning part are far apart, which is beneficial to the stability of the wire protection frame 10.

[0041] In this embodiment, the mounting portion 12 and the positioning portion 13 are provided in a one-to-one correspondence. Since the extension arm 122 needs to be elastic, its cross-sectional dimension cannot be too large, which weakens the strength of the extension arm 122. The positioning block structure 132 is provided at the end of the extension arm 122 away from the buckle 121, which shortens the length of the extension arm 122 and increases its strength, preventing the extension arm 122 from breaking. Therefore, in addition to its positioning function, the positioning block structure 132 also increases the strength of the mounting portion 12, improving the stability of the wire protection frame 10.

[0042] The isolation section 11 has an arc-shaped surface for mounting the conductor to be tested. The arc-shaped surface of the isolation section 11 allows the inner side of the toroidal core 20 to have a structure matching the shape of the conductor to be tested, thus reducing the shape requirements for the toroidal core 20. That is, the toroidal core 20 is not limited to a circular ring structure and can also be other ring structures. In this embodiment, the toroidal core 20 is a square ring structure.

[0043] Furthermore, in this embodiment, the skeleton 40 is only equipped with the first magnetic core 21, which is half of the annular magnetic core 20. In other embodiments, the skeleton 40 may extend to the upper cover 50 and both the first magnetic core 21 and the second magnetic core 22 may be installed on the skeleton 40, that is, the skeleton 40 is equipped with the entire annular magnetic core 20.

[0044] The skeleton 40 is provided with a glue injection groove 41, which is used to pour glue to bond and fix the skeleton 40 and the first magnetic core 21. The isolation part 11 of the wire protection frame 10 covers the glue injection groove 41. Glue inlets 42 are also provided on both sides of the glue injection groove 41. The first magnetic core 21 is connected to the glue injection groove 41 through the glue inlets 42. Glue is poured into the glue injection groove 41 to bond and fix the skeleton 40 and the first magnetic core 21. The isolation part 11 of the wire protection frame 10 can form a physical barrier between the glue and the wire under test to prevent the wire under test from contacting the glue.

[0045] Besides the frame 40, the mounted component can also be other parts of the Hall current sensor, such as the top cover 50, the base 60, etc. When the wire protection frame 10 is mounted on the base 60, the base 60 should be provided with a corresponding snap-fit ​​structure for the installation and fixation of the wire protection frame 10. When the wire protection frame 10 is mounted on the top cover 50, the isolation part of the wire protection frame 10 can be located on one side of the semi-annular magnetic core formed by splicing the first magnetic core 21, and the mounting part 12 is located on the side of the isolation part 11 facing the second magnetic core 22; the isolation part of the wire protection frame 10 can also be located on the side of the second magnetic core 22 and form a detachable connection with the top cover 50, in which case the isolation part 11 is a wire protection structure formed between the wire to be tested and the second magnetic core 22.

[0046] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that the remaining undescribed parts are prior art, and that all changes in form and detail made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims fall within the protection scope of the present invention.

Claims

1. A conductor protection frame, characterized in that: It includes an isolation section and a mounting section. The isolation section is used to form a wire protection structure, and the mounting section is used to be detachably mounted on the mounting part of the Hall current sensor. The wire protection frame is detachably mounted on the mounting part by means of the mounting section and forms part of the Hall current sensor.

2. The conductor protection frame according to claim 1, characterized in that: The mounting portion includes multiple clips disposed on one side of the isolation portion, thereby allowing the wire protection frame to be detachably snapped into the mounted component.

3. A conductor protection frame according to claim 2, characterized in that: Multiple clips are spaced apart around the isolation section, thereby forming a multi-point connection between the wire protection frame and the installed component, and the multiple connection points formed by the multi-point connection are located around the isolation section.

4. A conductor protection frame according to claim 2, characterized in that: The mounting portion includes an extension arm, and the latch is disposed at the end of the extension arm away from the isolation portion.

5. A conductor protection frame according to claim 1, characterized in that: It also includes a plurality of positioning parts disposed around the isolation part, the plurality of positioning parts being used to cooperate with the installed component to form multi-point positioning of the wire protection frame, thereby thereby stably installing the wire protection frame on the installed component.

6. A conductor protection frame according to claim 5, characterized in that: The positioning part includes a slit structure, which includes a first positioning surface and a second positioning surface that are perpendicular to each other. The first positioning surface is perpendicular to the installation direction of the wire protection frame. The first positioning surface is used to cooperate with the installed component to position the wire protection frame in the installation direction. The second positioning surface is used to cooperate with the installed component to position the wire protection frame perpendicular to the installation direction.

7. A conductor protection frame according to claim 6, characterized in that: The positioning part consists of four parts, and it also includes a positioning block structure. One side of the positioning block structure forms the second positioning surface. The positioning block structure also includes a third positioning surface perpendicular to the first positioning surface and the second positioning surface. The second positioning surface and the third positioning surface are respectively used to cooperate with the installed part to form the four corner positioning of the wire protection frame.

8. A conductor protection frame according to claim 1, characterized in that: The isolation section has an arc-shaped surface, which is used to mount the conductor to be tested.

9. A Hall current sensor, comprising a mounted component, characterized in that: It also includes a wire protection frame as described in any one of claims 1-8, wherein the mounted component is provided with a mating part, and the mating part is detachably connected to the mounting part of the wire protection frame.

10. A Hall current sensor according to claim 9, characterized in that: The mounted component is a frame for mounting at least a portion of a toroidal magnetic core.

11. A Hall current sensor according to claim 10, characterized in that: At least two first magnetic cores are mounted on the skeleton, and the first magnetic cores are spliced ​​together to form part of the annular magnetic core. The skeleton is provided with a glue injection groove, which is used to pour glue to bond and fix the skeleton and the first magnetic cores together. The isolation part of the wire protection frame covers the glue injection groove.

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