JP7195696B2 - detection sensor - Google Patents

Description

The present invention relates to a detection sensor that clamps a wire to be measured.

Patent Literature 1 describes a detection sensor 500 that clamps a wire to be measured. The detection sensor 500 includes a pair of clip pieces 501 and 502 that are rotatably connected about a rotation axis A, as shown in FIG. A receiving surface 503 is formed on the clip piece 501, and a pressing surface 504 is formed on the clip piece 502, so that the wire W to be measured can be sandwiched.

The length of the pressing surface 504 of the clip piece 502 is shorter than the length of the receiving surface 503 of the clip piece 501. Inside the receiving surface 503 of the clip piece 501, an electrode 505 capacitively coupled with the electric wire W to be measured is provided. are arranged.

Since the electrode 505 is arranged corresponding to the pressing surface 504 when the clip pieces 501 and 502 are closed, even if the wire W to be measured has a large diameter as shown in FIG. As shown in (b), even an electric wire W to be measured having a small diameter can be clamped in a state in which the electric wire W to be measured is close to the electrode 505 .

Japanese Patent Application Laid-Open No. 2018-13500

In order to increase the detection sensitivity of the detection sensor 500, it is effective to make the measurement electrode 505 larger. However, in the configuration of the detection sensor 500, even if the measurement electrode 505 is made large, the area where the measurement electrode 505 is close to the measurement target wire W does not become large, especially when the measurement target wire W having a small diameter is clamped. The size of the electrode 505 cannot be effectively utilized.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to increase the detection sensitivity of a detection sensor capable of clamping electric wires to be measured having different diameters.

In order to solve the above-described problems, a detection sensor according to one aspect of the present invention includes a first clamp portion in which a semicircular first curved portion and a first fulcrum portion are connected, and a center angle larger than that of the first curved portion. an arc-shaped second bending portion with a small diameter and a short arc length and a second clamp portion connected to the second fulcrum portion, and the first bending portion and the first bending portion are provided with the first fulcrum portion and the second fulcrum portion as axes A detection sensor that can be opened and closed with the second curved portion, wherein the second curved portion is provided with two electrodes, and an electrode portion that can be opened and closed is connected to the inside of the second curved portion. It is characterized by
Here, the two electrodes may be curved in the same direction as the second curved portion.
The apparatus may further include an elastic member that applies force in a direction to close the two electrodes, and a releasable open fixing mechanism that fixes the two electrodes in the open state.
At this time, the open fixing mechanism can be released by further pushing one electrode in the opening direction.
Further, the opening fixing mechanism may include a link plate attached to one electrode by a shaft member and having a claw formed at an end thereof, and a latch fixed to the other electrode and engaged with the claw. .
Further, the electrode portion may be covered with a resin-molded housing.

ADVANTAGE OF THE INVENTION According to this invention, the detection sensitivity of the detection sensor which can clamp the measuring object electric wire with a different diameter can be improved.

Fig. 3 shows a detection sensor of the present invention; It is a figure explaining a lower clamp part and an electrode part. It is a figure explaining the opening fixation mechanism of an electrode part. It is a figure which shows a state when the electric wire W to be measured with a large diameter is clamped. It is a figure which shows a state when the electric wire W to be measured with a small diameter is clamped. It is a figure which shows the application example of the detection sensor of this invention. It is a figure which shows the structural example of a sensor main body. 1 is a diagram showing a conventional detection sensor; FIG.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a detection sensor 100 of the present invention. The detection sensor 100 has a function of clamping wires W to be measured having different diameters, and includes an upper clamp section 110 , a lower clamp section 120 and an electrode section 130 . The upper clamp part 110 and the lower clamp part 120 can be opened and closed with the shaft 140 as a fulcrum. Note that the names of the upper part and the lower part are for convenience.

The upper clamp part 110 connects a semicircular upper curved part 110a, an upper gripping part 110b that is opened and closed by an operator, and the upper curved part 110a and the upper gripping part 110b. and a positioned upper fulcrum portion 110c. However, it does not have to be strictly semicircular.

The lower clamping portion 120 connects an arc-shaped lower curved portion 120a having a central angle smaller than that of the upper curved portion 110a, a lower grip portion 120b that is opened and closed by the operator, and the lower curved portion 120a and the lower grip portion 120b. and a lower fulcrum portion 120c on which the shaft 140 is positioned.

The diameter length of the upper curved portion 110a and the diameter length of the lower curved portion 120a can be substantially the same, and the upper clamping portion 110 and the lower clamping portion 120 are connected by a shaft 140 so as to form a circle when opened. It is At this time, a spring 141, which is an elastic member, applies force in a direction in which the upper clamp portion 110 and the lower clamp portion 120 are closed.

Since the arc length of the lower curved portion 120a is shorter than the arc length of the upper curved portion 110a, as shown in this figure, when the wire W to be measured is not clamped, the tip of the lower curved portion 120a is moved by the action of the spring 141. The detection sensor 100 is stabilized in a state where the portion (farther from the lower fulcrum portion 120c) abuts against the inner diameter portion of the upper curved portion 110a. The operator can perform the opening operation by gripping the upper grip portion 110b and the lower grip portion 120b, and can perform the closing operation by loosening the grip.

The electrode section 130 is configured to include two quarter-circular curved electrodes (first electrode 131 and second electrode 132) along the outer circumference of the wire W to be measured. However, it does not have to be strictly circular, and may be close to a straight line. The first electrode 131 and the second electrode 132 are connected to the central portion of the lower curved portion 120a by a shaft 133 in such a direction that the respective ends can form a semicircle. That is, the electrode section 130 can perform opening and closing operations inside the lower curved portion 120a at the lower curved portion 120a. It is assumed that the diameter of the electrode portion 130 is shorter than the diameter of the lower curved portion 120a.

The first electrode 131 and the second electrode 132 are oriented so as to form a semicircle in the same direction as the lower curved portion 120a. Both the first electrode 131 and the second electrode 132 are made of metal, and may be covered with a resin-molded housing, for example. Lead wires, cables, and the like are drawn out from the electrode portion 130 .

As shown in FIG. 2(a), a spring 142, which is an elastic member, is arranged on the shaft 133 between the first electrode 131 and the second electrode 132, and the first electrode 131 and the second electrode 132 are closed. A force is applied in the direction FIG. 2(b) is a view of the lower clamp section 120 and the electrode section 130 viewed from the upper clamp section 110 side. Thus, the lower clamping part 120 and the electrode part 130 are formed with a certain thickness. The same is true for the upper clamp portion 110 .

The first electrode 131 and the second electrode 132 are applied with a force in the closing direction by a spring 142, but have a releasable open fixing mechanism so that they can be fixed in the open state. The open fixation mechanism is designed to be released by further opening from the open fixation state, and can be composed of, for example, a link plate 135 and a latch 134 as shown in FIG.

The link plate 135 has an arc shape, one end of which is attached to the open end side of the first electrode 131 by a shaft mechanism 136, and the other end of which is claw-shaped. The central portion of the link plate is U-shaped so as to avoid the shaft 133, and a projection 136 is formed in that portion. The protrusion 136 fits into a groove 123 formed in the lower clamping portion 120 . Therefore, the link plate 135 can move along the groove 123 with the shaft mechanism 136 as a fulcrum.

The latch 134 is fixed in the middle of the second electrode 132 and meshes with the claws of the link plate 135 when the electrode portion 130 is open. That is, when the claws of the link plate 135 mesh with the latch 134, the electrode portion 130 is fixed in an open state as shown in FIG. 3(a).

As shown in FIG. 3(b), when the first electrode 131 is pushed in the F direction to open further, the hook of the link plate 135 is disengaged from the latch 134, and the action of the spring 142 causes the first electrode 131 to open as shown in FIG. 3(c). As shown, the electrode portion 130 will be closed. The closed electrode portion 130 can be fixed in the open state as shown in FIG. 3(a) by manually opening and engaging the latch 134 with the pawl. However, the releasable open fixing mechanism is not limited to the example shown in this figure.

When the detection sensor 100 clamps the wire W to be measured, the electrode section 130 is previously fixed in an open state by an open fixing mechanism. Then, the upper clamp portion 110 and the lower clamp portion 120 are opened to clamp the wire W to be measured. As a result of this operation, the wire W to be measured pushes the first electrode 131 in the direction in which it opens, so that the opening fixing mechanism is released, and the electrode section 130 is moved to a state where the first electrode 131 and the second electrode 132 are in contact with the wire W to be measured. will be closed.

FIG. 4 shows how a large-diameter electric wire W to be measured is clamped, and FIG. 5 shows how a small-diameter electric wire W to be measured is clamped. As described above, in the detection sensor 100 of the present embodiment, both the large-diameter electric wire W to be measured and the small-diameter electric wire W to be measured can be brought close to the electric wire W to be measured over the entire electrode section 130 . Size can be used effectively. Thereby, the detection sensitivity of the detection sensor 100 is enhanced.

Such a detection sensor 100 can be connected to a sensor body 200 as shown in FIG. 6, for example. The sensor main body 200 is a voltage measuring instrument for measuring AC voltage. In the example of this figure, the wire W to which the AC voltage Vx of the frequency fx is applied is the object of measurement. A wire W to be measured is composed of a conductor 310 and an insulating coating 320 .

The wire W to be measured is clamped by the detection sensor 100, and the electrode section 130 and the conductor 310 of the wire W to be measured are capacitively coupled by a parasitic capacitance C1.

The sensor main body 200 is provided with a variable voltage source 210 whose output voltage Vs is variable at a frequency fs. It is assumed that both the frequency fx and the frequency fs are known and that fs>>fx. Capacitance C1 may be unknown.

Let Ix be the current of frequency fx flowing through the capacitor C1 caused by the voltage Vx to be measured, and Is the current of the frequency fs flowing through the capacitor C1 caused by the voltage Vs of the variable voltage source 210 . Actually, a current obtained by superimposing the current Ix and the current Is flows through the capacitor C1.

Further, the sensor body 200 is provided with a current detection section 220 , a difference extraction section 230 , a voltage adjustment section 240 , a voltage measurement section 250 and a calculation section 260 .

Current detection section 220 detects a current in which current Ix and current Is are superimposed. Difference extraction section 230 extracts and outputs a value corresponding to the difference between the magnitude of current Ix and the magnitude of current Is from the detection result of current detection section 220 . The voltage adjustment unit 240 changes the output voltage Vs of the variable voltage source 210 so that the output of the difference extraction unit 230 becomes 0, that is, the magnitude of the current Is becomes equal to the magnitude of the current Ix. Voltage measuring section 250 measures output voltage Vs of variable voltage source 210 . The calculation unit 260 calculates and outputs the voltage Vx based on the measurement result of the voltage Vs in the voltage measurement unit 250 .

ここで、Ａを定数としてｆｓ＝Ａ×ｆｘとすると、

が成り立つので、［数５］が得られる。

差分抽出部２３０と電圧調整部２４０により、Ｉｘ＝Ｉｓとなるように電圧Ｖｓが調整されるため、［数１］［数２］より、

そして、［数５］［数６］より［数７］が得られる。

したがって、演算部２６０は、電圧測定部２５０の測定結果ＶｓをＡ倍する演算を行なうことで、測定対象電圧Ｖｘを算出し、測定結果として出力することができる。例えば、測定対象電圧の周波数ｆｘを商用電源の５０Ｈｚとすると、測定側の周波数ｆｓが５０ｋＨであれば、電圧Ｖｓを１０００倍した値が測定対象の電圧Ｖｘとなる。すなわち、測定対象電圧が数ｋＶであっても数Ｖの電圧で測定できることになる。 In this configuration, if the impedance of the capacitor C1 with respect to the current Ix is Xcx, and the impedance of the capacitor C1 with respect to the current Is is Xcs, the currents Ix and Is can be expressed as follows.

Here, if A is a constant and fs=A×fx, then

holds, [Equation 5] is obtained.

Since the voltage Vs is adjusted so that Ix=Is by the difference extraction unit 230 and the voltage adjustment unit 240, from [Formula 1] and [Formula 2],

Then, [Equation 7] is obtained from [Equation 5] and [Equation 6].

Therefore, the calculation unit 260 can calculate the voltage Vx to be measured by multiplying the measurement result Vs of the voltage measurement unit 250 by A, and can output it as the measurement result. For example, if the frequency fx of the voltage to be measured is 50 Hz of the commercial power supply, and the frequency fs on the measurement side is 50 kHz, the value obtained by multiplying the voltage Vs by 1000 is the voltage Vx to be measured. That is, even if the voltage to be measured is several kV, it can be measured with a voltage of several volts.

The detection sensor 100 and the sensor main body 200 may be of a separate type connected by a cable 190 as shown in FIG. 7(a), or may be of an integrated type as shown in FIG. 7(b). Further, the sensor main body 200 to which the detection sensor 100 is connected is not limited to voltage measurement, and may be one that performs current measurement, magnetic measurement, or the like.

100 detection sensor 110 upper clamping portion 110a upper bending portion 110b upper gripping portion 110c upper fulcrum portion 120 lower clamping portion 120a lower bending portion 120b lower gripping portion 120c lower fulcrum portion 130 electrode portion 131 first electrode 132 second electrode 133 shaft 134 latch 135 Link plate 136 Shaft mechanism 140 Shaft 190 Cable 200 Sensor main body 210 Variable voltage source 220 Current detection unit 230 Difference extraction unit 240 Voltage adjustment unit 250 Voltage measurement unit 260 Operation unit 310 Conductor 320 Insulation coating

Claims (6)

a first clamping portion in which the semicircular first curved portion and the first fulcrum portion are connected;
An arc-shaped second curved portion having a smaller center angle and a shorter arc length than the first curved portion and a second clamp portion connected to the second fulcrum,
A detection sensor for clamping an electric wire to be measured, wherein the first bending portion and the second bending portion can be opened and closed about the first fulcrum portion and the second fulcrum portion,
The second bending portion is provided with two electrodes whose ends are connected by a shaft for capacitive coupling with the conductor of the electric wire to be measured, the electrodes being openable and closable inside the second bending portion. A detection sensor, characterized in that the parts are connected. 2. The detection sensor according to claim 1, wherein the two electrodes are curved in the same direction as the second curved portion. an elastic member that applies force in a direction to close the two electrodes;
3. The detection sensor according to claim 1, further comprising a releasable open fixation mechanism that fixes the two electrodes in an open state. 4. The detection sensor according to claim 3, wherein the open fixation mechanism is released by further pushing one of the electrodes in the opening direction. The opening and fixing mechanism is characterized by including a link plate attached to one electrode by a shaft mechanism and having a claw formed at one end thereof, and a latch fixed to the other electrode and engaged with the claw. The detection sensor according to claim 3 or 4. The detection sensor according to any one of claims 1 to 5, wherein each of the two electrodes of the electrode section is covered with a resin-molded housing.

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