JP3549354B2 - Clamp sensor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a clamp sensor that stabilizes the opening and closing operation of a core holder, thereby ensuring the engagement between the distal end engagement portions of the core portion at the time of closing, and contributing to facilitation of assembly work. About.
[0002]
[Prior art]
FIG. 7 shows the structure of a main part of a conventional example, in which a pair of cores 2a, 3a formed by laminating magnetic steel plates and having a semi-annular shape are wound via bobbins 2b, 3b. , 3c are housed in core holders 4, 5 made of an insulating material to form a clamp sensor 1.
[0003]
Further, a lever 5a urged in the closing direction by the coil spring 6 inserted therein is provided on the side of the one core holder 5, and the lever 5a is applied to the resilient force of the coil spring 6. When pressed against each other, the magnetic cores 2 and 3 are formed so that they can open freely via a link mechanism 7 interposed between the base ends.
[0004]
In this case, each of the magnetic cores 2 and 3 is formed so as to be openable by tightening a nut 9 on a supporting screw 8 together with the core holders 4 and 5 in which the magnetic cores 2 and 3 are stored. Since they are integrally attached, the difficult adjustment of the opening and closing operation is also performed by strongly tightening or loosening the nut 9.
[0005]
[Problems to be solved by the invention]
Therefore, when the opening and closing operation of the clamp sensor 1 is to be performed more smoothly, it can be easily performed by loosening the tightened state of the nut 9 with respect to the screw rod 8.
[0006]
However, when the tightening state of the nut 9 with respect to the threaded rod 8 is loosened, the core holders 4 and 5 are loosened to reduce the overall strength. As a result, for example, the clamp sensor 1 is not forcibly placed in a place where wiring is complicated such as a switchboard. When the wire under test is closed to enclose the target wire to be measured, the tips of the magnetic cores 2 and 3 may not mesh well with each other, and the reliability of the measurement work may be reduced. there were.
[0007]
The present invention has been made in view of the above-mentioned problems in the prior art, and provides a clamp sensor capable of performing a highly accurate measuring operation by reliably engaging the leading ends of magnetic cores with each other when closing. To do so has its purpose.
[0008]
[Means for Solving the Problems]
SUMMARY OF THE INVENTION The present invention has been made to achieve the above-described object, and the feature of the configuration is that a movable core formed by separately storing magnetic cores that are arranged in a pair in a substantially circular arc shape in a core holder. The side sensor and the fixed side sensor are supported via a support shaft inserted through the bearing, and the open end of the torsion coil spring interposed in the bearing is connected to the movable-side core holder, and the open end is connected to the open end. In the clamp sensor in which the magnetic cores can be freely opened and closed by hooking the respective portions to the fixed-side core holders, each of the magnetic cores is covered by a portion excluding the core portion and the distal end engaging portion and the proximal end engaging portion of the core portion. And a bobbin portion having projections projecting outward on both side surfaces of the start end portion and the end portion thereof, and being wound around a peripheral surface excluding the start end portion and the end portion of the bobbin portion. And each of the core holders Is formed by providing a hole portion that fits with the projection at each of the portions of the bobbin portion facing the projection, which are divided into a one-side holder portion and the other-side holder portion that face each other so as to fit freely. and, core holder mutually Rutotomoni is pivotally supported to form a sliding surface on the periphery portion of the bearing portion, the torsion coil spring is retractably inserting the open other end to be hooked to the core holder of the fixed-side With this arrangement, the position of the latching end can be freely adjusted through the latching cover so that the side of the other open end is latched .
[0009]
In this case, the torsion coil spring, prior SL with interposed by parallel two to bearing portions, each of said open second end portion adjacent and parallel to inserted into each other in the locking cover integrally It is desirable to connect. Further, at least one of the one-side holder portion and the other-side holder portion constituting the movable-side core holder, a boss portion for temporarily locking the open other end portion when the torsion coil spring is mounted is provided at the final position. It is preferable that the projection is provided in the vicinity of the bearing portion where a gap can be secured between the boss portion and the boss portion when the hook is engaged.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is an explanatory view showing an example of the internal structure of the clamp sensor according to the present invention, wherein (a) shows a closed state and (b) shows an open state.
[0011]
According to the figure, the clamp sensor 11 is a movable-side sensor in which magnetic cores 14 and 21 which are arranged in a pair in a substantially arc shape are separately housed in core holders 31 and 34 which are resin molded products. One end of an open end of a torsion coil spring 45, which supports the sensor 12 and the fixed-side sensor 13 via a support shaft 38 inserted through the bearing 37, and is disposed on the bearing 37 via a coil spring 45a. Hook 45b to the movable-side core holder 31 and hook open end 45c to the fixed-side core holder 34, respectively.
[0012]
Among these, each of the magnetic cores 14 and 21 includes, for example, core parts 15 and 22 formed by laminating a required number of magnetic thin steel sheets, and bobbin parts 16 and 23 that are separately provided on the core parts 15 and 22, respectively. The windings 20 and 27 are respectively wound around the bobbin portions 16 and 23 and pulled out.
[0013]
In this case, each of the core portions 15 and 22 includes distal engaging portions 15a and 22a and proximal engaging portions 15b and 22b, respectively, and the distal engaging portions 15a and 22a and the proximal engaging portions 15b and 22b are mutually different. Each is formed so as to be freely meshable in a comb shape.
[0014]
The bobbin portions 16 and 23 are respectively provided so as to cover at least portions of the core portions 15 and 22 except the distal end engaging portions 15a and 22a and the proximal end engaging portions 15b and 22b, and the starting end portions 16a and 23a are provided. Flanges 17 and 24 are provided at the boundary with the end portions 16b and 23b, and flange portions 18 and 25 with steps 18a and 25a are provided at the boundary with the end portions 16b and 23b.
[0015]
Further, the bobbin portions 16 and 23 are formed with projections 19 and 26 projecting outward at appropriate positions on both side surfaces of the start end portions 16a and 23a and the end portions 16b and 23b along the respective opening and closing directions. Have been.
[0016]
Furthermore, the windings 20 and 27 are formed on the peripheral surfaces of the bobbin portions 16 and 23 except for the start end portions 16a and 23a and the end portions 16b and 23b, that is, between the flange portions 17 and 18 and the flange portions 24. It is arranged by being wound on each outer peripheral surface located between the flange portion 25.
[0017]
On the other hand, the movable-side core holder 31 is fitted to the one-side holder part 32 and the other-side holder part 33 that are face-to-face with each other. And the other-side holder portion 36 are formed in two parts, respectively. The one-side holder portion 32 and the other-side holder portion 33 are formed into a cylindrical portion 37a which can form a bearing portion 37 when fitted. , 37b are formed with through holes 39, 39 for inserting a support shaft 38 into the bearing portion 37 at portions facing the one-side holder portion 35 and the other-side holder portion 36, respectively.
[0018]
In addition, the one-side holder 32 and the other-side holder 33 and the one-side holder 35 and the other-side holder 36 shown in FIG. Holes 32a, 35a and 33a, 36a are provided at positions facing the respective projections 19, 26 provided on the projections 16, 23 in a positional relationship to be fitted with the projections 19, 26.
[0019]
Further, the core holders 31 and 34 are pivotally supported by forming sliding contact surfaces 40 and 41 around the bearing portion 37 through which the support shaft 38 is inserted, as shown in FIGS. 4 and 6. Through these sliding contact surfaces 40, 41, when the lever portions 32b, 33b provided at the base end of the movable-side core holder 31 are operated, the movable-side core holder 31 is moved relative to the fixed-side core holder 34. It can be opened while supporting it stably.
[0020]
Further, the coil spring 45 torsion interposed bearing portion 37 through the coil spring portion 45a is an open end 45b to the support portion 42 of the core holder 31 of the movable, stationary side of the open other end portion 45c It would cause their respective hooked on hooking notch 43 of the core holder 34.
[0021]
In this case , the open other end 45c to be hooked on the hooking notch 43 of the fixed-side core holder 34 is defined by the relationship between the hooking notch 43 and the distance between the side wall 34a. As shown in detail in FIG. 2, the length of a portion located between the notch portion 43 and the side wall portion 34a is adjusted to provide flexibility in the length of the portion. , And the other end 45c is inserted and connected to a holding hole 46a provided in the latch cover 46 so that the latch cover 46 can move forward and backward. and to be able to freely advance and retract adjust the position of the hooking end 47 by.
[0022]
As shown in FIG. 6, two torsion coil springs 45 are interposed in parallel with the bearing 37 via the respective coil springs 45a, 45a, and the other end of the open end which is adjacent in parallel. It is preferable that each of 45c, 45c is separately inserted into holding holes 46a, 46a arranged in a row in the latch cover 46 and integrally connected.
[0023]
Further , the inner surface of at least one of the one-side holder portion 32 and the other-side holder portion 33 constituting the movable-side core holder 31, preferably both inner surfaces are twisted as shown in detail in FIG. The bosses 32c and 33c for temporarily locking the other open end 45c when the coil spring 45 is mounted, and the bearing portion 37 for securing a gap t between the bosses 32c and 33c when the coil spring 45 is finally locked. That is, it is desirable to protrude in the vicinity of the respective cylindrical portions 37a and 37b in a positional relationship where they face each other.
[0024]
In addition, the clamp sensor 11 having the above configuration can be formed as an independent unit by itself, or can be clamped by being integrally combined with a holder main body (not shown) provided with essential members such as a display panel. It may be formed as an ammeter.
[0025]
Since the present invention is configured as described above, when assembling the entire clamp sensor 11, first, the movable sensor 12 and the fixed sensor 13 are partially assembled.
[0026]
That is, after the base end engaging portion 15b of the movable side core portion 15 and the base end engaging portion 22b of the fixed side core portion 22 are engaged with each other, the magnetic core 14 is inserted into the other side holder portion 33 of the core holder 31. Deploy.
[0027]
Thereafter, the support shaft 38 is inserted into the cylindrical portion 37b of the bearing portion 37 with respect to the other holder portion 36 of the core holder 34 through which the support shaft 38 is inserted through the through hole 39, and By assembling the other side holder 33 on the movable side while disposing the, the sliding contact surface 41 is formed around the cylindrical portion 37b to be assembled.
[0028]
At this time, the projections 19 of the bobbin portion 16 constituting the movable-side magnetic core 14 correspond to the holes 33a of the other-side holder portion 33, which correspond to the respective portions, and the bobbin constituting the fixed-side magnetic core 21. Since the projections 26 of the portion 23 are mutually fitted with the holes 36a of the corresponding other-side holder portion 36, the positions are correctly fixed and combined.
[0029]
Next, after the coil spring portion 45a of the torsion coil spring 45 is interposed in the cylindrical portion 37b, and the open one end portion 45b is hooked inside the support portion 42, the one-side holder portion 32 is connected to the other-side holder portion. The movable-side core holder 31 is formed by fitting to the movable member 33. At this time, since the projection 19 of the bobbin part 16 is fitted with the hole part 32a of the one-side holder part 32, the magnetic core 14 is correctly positioned and stored in the core holder 31.
[0030]
Thereafter, the other open end 45c of the torsion coil spring 45 is hooked to the notch 43 for hooking of the other holder 36, and then the one holder 35 is fitted to the other holder 36. The fixed-side core holder 34 is assembled while forming the sliding contact surface 40 around the cylindrical portion 37a.
[0031]
In addition, at this time, since the projection 26 of the bobbin portion 23 fits with the hole 35a of the one-side holder portion 35, the magnetic core 21 is correctly positioned and stored in the core holder 34.
[0032]
The movable sensor 12 having the magnetic core 14 housed in the core holder 31 and the fixed sensor 13 having the magnetic core 21 housed in the core holder 34 are fixed to the screw holes 38 a of the support shaft 38. The clamp sensor 11 is assembled by screwing the attachment screws 44 together.
[0033]
For this reason, the clamp sensor 11 includes a movable sensor 12 in which the core holder 31 and the magnetic core 14 are structurally integrated, and a fixed sensor 13 in which the core holder 34 and the magnetic core 21 are structurally integrated. It can be formed with an increased overall strength.
[0034]
Moreover, the movable sensor 12 and the fixed sensor 13 form wide sliding contact surfaces 40, 41 between the core holders 31, 34 when the movable sensor 12 is opened and closed via the levers 32b, 33b. Meanwhile, the movable-side core holder 31 can be stably supported by the fixed-side core holder 34.
[0035]
Therefore, even when the wire to be measured is forcibly fed into a place where wiring is complicated, such as a switchboard, and is closed to enclose a target electric wire to be measured, the clamp sensor 11 can be placed between the core holders 31 and 34. Since the movable sensor 12 can be stably operated while forming the wide sliding contact surfaces 40 and 41, the tip engagement portions 15a and 22a of the core portions 15 and 22 can be reliably engaged with each other. In this case, the measuring operation can be performed accurately and smoothly.
[0036]
Moreover, the clamp sensor 11 itself can be provided as an independent product alone without being integrated with a holder main body provided with essential members such as a display panel. For example, it is possible to provide design diversity.
[0037]
On the other hand, a hooking cover 46 is connected to the open other end 45c of the torsion coil spring 45 so as to be able to advance and retreat, and the hooking end 47 of the hooking cover 46 is merely brought into contact with the side wall portion 34a, so that the hooking is performed. The hooking cover 46 can be hooked on the hooking notch 43 very easily while corresponding to the distance between the hook notch 43 and the side wall 34a, which contributes to the simplification of the assembly work. Can be.
[0038]
Further, the two torsion coil springs 40, 40 are interposed in the bearing 37 via the respective coil springs 40a, 40a, and the other open ends 40c, 40c are arranged in a row on the latch cover 41. In the case of separately inserting into the holding holes 41a and 41a and integrally connecting them, it is possible to contribute to the simplification of the assembling work while obtaining a more favorable elastic force.
[0039]
In addition, if the bosses 32c, 33c are protruded from the inner surface of one or both of the one-side holder portion 32 and the other-side holder portion 33 that constitute the movable-side core holder 31, twisting is performed. When the coil spring 45 is mounted, the other end 45c is temporarily engaged with the bosses 32c and 33c, and then the necessary assembly is performed. Finally, the other end 45c and the cover Since the locking of the torsion coil spring 45 can be carried out smoothly. Note that when the other open end 45c and the latch cover 46 are finally latched in the latch notch 43, a gap t is formed between the latch notch 43 and the boss 33c (32c) as shown in FIG. As a result, the required spring force can be exerted on the torsion coil spring 45.
[0040]
【The invention's effect】
As described above, according to the present invention, each of the magnetic cores includes a bobbin portion provided with a protrusion, and each of the core holders includes a bobbin portion that is divided into one-side holder portion and the other-side holder portion. Since the hole is formed to be fitted with the protrusion, the core holder and the magnetic core are structurally integrated to increase the overall strength of the clamp sensor, and to provide design diversity. Can be assembled.
[0041]
In addition, since the clamp sensor can be formed by stably supporting the movable core holder on the fixed core holder while forming a wide sliding contact surface between the core holders, wiring such as a switchboard is complicated. The measuring operation can be performed accurately and smoothly while reliably engaging the leading end engaging portions of the core portion with each other even in the place.
[0042]
Further, in the open other end of the torsion coil spring, and locking cover is connected retractably, simply by abutting the engaging end of the hook cover to the fixed side of the core holder, the side of the open second end portion Can be hooked very easily, which can contribute to simplification of the assembling work.
[0043]
Further, in a case where two torsion coil springs are interposed in the bearing portion, and each of the other open ends is separately inserted into the latch cover and integrally connected, a more preferable elastic force is provided. It is possible to contribute to the simplification of the assembling work while obtaining.
[0044]
Further, when the boss portion is protruded from at least one of the one-side holder portion and the other-side holder portion constituting the movable-side core holder, the other end portion is opened to the boss portion when the torsion coil spring is mounted. Can be temporarily hooked, and necessary assembly can be performed, and finally the hook can be hooked to the notch for hooking, which can contribute to smooth mounting work of the torsion coil spring.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing an example of the internal structure of a clamp sensor according to the present invention, wherein (a) shows a closed state and (b) shows an open state.
FIG. 2 is an explanatory diagram showing an enlarged main part in FIG.
FIG. 3 is an explanatory view of a principal part showing, as a longitudinal section, a correspondence relationship between a projection of a bobbin and a hole of a core holder, taking a fixed-side sensor as an example.
FIG. 4 is an explanatory view showing a state of a sliding contact surface formed between a movable-side core holder and a fixed-side core holder, taking each one-side holder portion side as an example.
5A and 5B are front views of the clamp sensor shown in correspondence with FIG. 1, wherein FIG. 5A shows a closed state, and FIG. 5B shows an open state.
FIG. 6 is a sectional view taken along line AA in FIG.
FIG. 7 is an explanatory view showing, as an example, an internal structure of a clamp sensor section in a conventional clamp-type ammeter.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Clamp sensor 2, 3 Magnetic core 2a, 3a Core part 2b, 3c Winding 4, 5 Core holder 5a Lever 6 Coil spring 7 Link mechanism 8 Screw 9 Nut 10 Holder main body 11 Clamp sensor 12 Movable sensor 13 Fixed sensor 14 , 21 magnetic cores 15, 22 core portions 15a, 22a distal end engaging portions 15b, 22b proximal end engaging portions 16, 23 bobbin portions 16a, 23a start end portions 16b, 23b end portions 17, 18, 24, 25 flange portions 25a steps 19, 26 Projection 20, 27 Winding 31, 34 Core holder 34a Side wall 32, 35 One side holder 33, 36 Other side holder 32a, 33a, 35a, 36a Hole 32b, 33b Lever 32c, 33c Boss 37 Bearing 37a, 37b cylindrical portion 38 support shaft 38a screw hole 39 through hole 40, 41 sliding contact surface 42 support column 4 Hooking notch 44 fastened screw 45 torsion coil spring 45a coil spring portion 45b open end 45c open and the other end portion 46 engaging the cover 46a holding hole 47 Kaketometan

Claims (3)

A pair of magnetic cores having a substantially arc shape and arranged in a pair are individually housed in a core holder. And a clamp sensor in which the open end of the torsion coil spring interposed in the bearing portion is hooked to the movable-side core holder, and the open other end is hooked to the fixed-side core holder, and can be freely opened and closed.
Each of the magnetic cores is covered at a portion other than the core portion and the distal engagement portion and the proximal engagement portion of the core portion, and extends outward on both side surfaces of the start end and the end. A bobbin portion having a protruded protrusion, and a winding wound around the peripheral surface excluding the start end and the end of the bobbin portion and drawn out, and each of the core holders is freely fittable. The holder is divided into two parts, one side holder part and the other side holder part, which face each other, and is formed by providing a hole part to be fitted with the projection at each of the parts of the bobbin part facing the projection, and the core holders are mutually formed. , Rutotomoni is pivotally supported to form a sliding surface on the periphery portion of the bearing portion, the torsion coil spring is hooked cover freely is inserted forward and backward to open the other end portion to be hooked to the core holder of the fixed-side Through this, the position of the latched end can be freely adjusted and Clamp sensor characterized in that is hooked to the side of the other end. Two torsion coil springs are interposed in parallel with the bearing portion, and each of the open end portions adjacent in parallel is separately inserted into the hooking cover and integrally connected. The clamp sensor according to claim 1, wherein: At least one of the one-side holder portion and the other-side holder portion constituting the movable-side core holder has a boss portion for temporarily locking the open other end portion when the torsion coil spring is mounted, and a final hook thereof. 3. The clamp sensor according to claim 1 , wherein the clamp sensor is provided so as to protrude in the vicinity of a bearing portion which can secure a gap between the boss portion and the boss portion.

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