JP2014013182A - Clamp sensor and measurement device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely maintain a state where a pair of sensors face each other.SOLUTION: A clamp sensor includes a body part 21 having a regulation recess 45, a slide part 23 having a beltlike member 61, and an operation part 26 having a releasing recess 82. The beltlike member 61 includes a regulation projected part 71 engaged with the regulation recess 45 in an undeformed state, and a releasing projected part 72 disposed in the releasing recess 82 in a deformed state. The operation part 26 regulates deformation of the beltlike member 61 in a slid state to a tip 21a side to maintain an engaged state between the regulation projected part 71 and the regulation recess 45, regulates sliding of the slide part 23, permits arrangement of the releasing projected part 72 in the releasing recess 82 and deformation of the beltlike member in a slid state to a base end part 21b side, and releases the engagement between the regulation projected part 71 and the regulation recess 45 to release sliding regulation of the slide part 23.

Description

  The present invention relates to a clamp sensor including a pair of sensor units that can face each other and a measuring device including the clamp sensor.

  As this type of clamp sensor, a clamp sensor disclosed by the applicant in Japanese Patent Laid-Open No. 7-325109 is known. The clamp sensor includes a main body case in which a first magnetic core is disposed at a front end portion, a slide case in which a second magnetic core is disposed at a front end portion and is slidable with respect to the main body case. It is configured with. In this clamp sensor, when the slide case is slid to the distal end side of the main body case and the lead wire to be measured is clamped at the distal ends of the two, the magnetic cores disposed at the distal ends face each other. In this state, each magnetic core detects magnetism generated by current flowing through the conducting wire. By using this clamp sensor, the current value of the current flowing through the electric wire can be measured based on the magnetic detection value detected by the clamp sensor.

  The clamp sensor also includes a mechanism for preventing the slide case from sliding toward the base end side of the main body case and releasing the clamped state (the state where the magnetic cores face each other). Specifically, this clamp sensor is a locking plate spring that is disposed in a state in which a base end portion (support portion) is fixed to a main body case and a distal end portion (swing portion) can swing vertically. And a slider that can slide relative to the slide case. In addition, a latch is formed at the lower part of the base end side of the slide case, and a leaf spring of the lower part of the base end side of the slider is moved when the slider is slid to the base end side of the slide case. A pressing portion having an inclined surface that pushes down the tip is formed. In this case, when the slide case is positioned on the distal end side of the main body case (clamped state), the distal end portion of the leaf spring engages with the latch of the slide case and slides toward the proximal end portion side of the main body case. Case sliding is regulated. On the other hand, when the slider is slid to the base end side of the slide case, the inclined surface of the pressing portion pushes down the tip of the leaf spring, thereby releasing the engagement between the tip of the leaf spring and the latch of the slide case. Thus, the slide case can be slid toward the base end side of the main body case.

Japanese Patent Laid-Open No. 7-325109 (page 4, FIG. 1-3)

  However, the above clamp sensor has the following problems to be improved. That is, in this clamp sensor, a cantilever type plate spring (cantilever spring) whose base end portion is fixed and the tip end portion swings is used as a plate spring for locking. Further, in this clamp sensor, the cantilever spring is disposed in the main body case so that the length direction of the cantilever spring is along the slide direction of the slide case. In this case, this type of cantilever spring may be buckled (curved) when a large pressing force is applied in the length direction. For this reason, when a large force is applied to the clamp sensor toward the base end during measurement, the clamp sensor is released from the locked state due to buckling of the locking plate spring, and the slide case It may be difficult to keep the two magnetic cores facing each other by sliding toward the proximal end side.

  This invention is made | formed in view of this subject, and it aims at providing the clamp sensor and measurement apparatus which can maintain reliably the state which made a pair of sensor part mutually oppose.

In order to achieve the above object, the clamp sensor according to claim 1,
A clamp sensor having a pair of sensor parts that can be opposed to each other, wherein a body part in which one of the sensor parts is disposed at a tip part and the other of the sensor parts is disposed in the tip part A slide part accommodated in the main body part so as to be slidable relative to the main body part along a slide direction connecting the base part and a base end part of the main body part, and the slide part along the slide direction. An operation of restricting the slide to the base end side of the slide part, which is disposed inside the slide part so as to be slidable relative to the distal end side, and releasing the restriction of the slide is performed. And a control recess is formed on the inner surface of the main body, and the outer wall of the slide portion extends along the outer wall of the slide portion facing the inner surface. The end is fixed to And a non-fixed portion excluding the end portion is disposed so as to be displaced toward the inside of the slide portion, and a release recess is formed on the outer surface of the operation portion facing the outer wall. Formed on the non-fixed portion of the band-shaped member and protruding toward the outer surface, and a protruding protrusion that protrudes toward the inner surface and engages with the restriction recess in the non-deformed state of the band-shaped member. A release convex portion disposed in the release concave portion in the deformed state of the belt-like member, and the operation portion regulates deformation of the belt-like member in a state of being slid to the tip end side. Thus, the sliding state of the slide part toward the base end side is restricted by maintaining the engagement state between the restriction convex part and the restriction concave part, and is slid to a predetermined position on the base end side. The release recess when The disengagement of the restricting protrusion and the restricting recess is released by permitting the disposition of the releasing protrusion and allowing the belt-shaped member to be deformed, and the slide toward the base end side. Release the restriction of the slide of the part.

  The clamp sensor according to claim 2 is a clamp sensor provided with a pair of sensor parts that can be opposed to each other, and a main body part in which any one of the sensor parts is disposed at a tip part, A slide portion housed in the main body portion slidable relative to the main body portion along a slide direction in which the other of the sensor portions is disposed and connects the distal end portion and the base end portion of the main body portion; The slide portion is disposed inside the slide portion so as to be slidable relative to the slide portion along the slide direction, and slides toward the proximal end portion of the slide portion positioned on the distal end portion side. And an operation portion for performing an operation of releasing the restriction of the slide, a restriction recess is formed on the inner surface of the main body portion, and the slide portion has an outer wall facing the inner surface. along An end portion is fixed to the outer wall so as to exist, and a deformable belt-like member is disposed so that a non-fixed portion excluding the end portion is displaced toward the inner surface, and faces the outer wall in the operation portion. A release concave portion is formed on the outer surface, and the non-fixed portion of the band-shaped member protrudes toward the inner surface and engages with the restriction concave portion in a deformed state of the band-shaped member; And a release projection that is disposed in the release recess in a non-deformed state of the belt-shaped member and protrudes toward the outer surface, and the operation unit is slid to the tip side. The belt-shaped member is deformed to maintain the engagement state between the restricting convex portion and the restricting concave portion to restrict the sliding of the slide portion toward the base end portion, and the base end portion side in advance It can be slid to a fixed position Sometimes, the arrangement of the release convex portion in the release concave portion is allowed and the belt-like member is returned to an undeformed state to release the engagement between the restriction convex portion and the restriction concave portion. The restriction | limiting of the slide of the said slide part to the said base end part side is cancelled | released.

  Further, the clamp sensor according to claim 3 is the clamp sensor according to claim 1 or 2, wherein the belt-like member is fixed to the outer wall only at one end located on the base end side and the tip. The restricting convex portion is disposed at the other end located on the portion side.

  A clamp sensor according to a fourth aspect is the clamp sensor according to any one of the first to third aspects, wherein the slide portion and the belt-like member are integrally formed.

  A measuring device according to a fifth aspect includes the clamp sensor according to any one of the first to fourth aspects, and a measuring unit that measures an electrical parameter based on a physical quantity detected by the clamp sensor. .

  In the clamp sensor according to claim 1 and the measuring device according to claim 5, the restriction convex part that can be engaged with the restriction concave part of the main body part and the release convex part that can be arranged in the release concave part of the operation part are not provided. A belt-like member formed on the fixing portion is provided, and the operation portion maintains and releases the engagement state between the restriction convex portion and the restriction concave portion according to the slide toward the distal end side and the base end portion of the main body portion. Then, the slide of the slide part to the base end side is regulated and the regulation is released. For this reason, according to the clamp sensor and the measuring apparatus, the tip of the cantilevered spring member arranged so that the length direction is along the slide direction of the slide portion is brought into contact with the slide portion to slide the slide portion. Unlike the conventional configuration that regulates the band-shaped member, even if a large force is applied in the direction toward the proximal end with respect to the slide during measurement, the band-shaped member does not buckle and As a result of reliably maintaining the engagement state with the recess, sliding of the slide portion during measurement can be reliably prevented. Therefore, according to the clamp sensor and the measuring apparatus, it is possible to reliably prevent a situation in which the measured value of the current as the electrical parameter fluctuates (fluctuates) due to the two sensors not being opposed to each other. .

  Further, in the clamp sensor according to claim 2 and the measuring device according to claim 5, the restricting convex portion that can be engaged with the restricting concave portion of the main body portion and the releasing convex portion that can be disposed in the releasing concave portion of the operation portion. Is provided with a belt-like member formed in the non-fixed portion, and the operation portion maintains and releases the engagement state between the restriction convex portion and the restriction concave portion in accordance with the slide toward the distal end side and the base end portion of the main body portion. Is performed to restrict and release the sliding of the sliding portion toward the base end side. For this reason, according to the clamp sensor and the measuring apparatus, the tip of the cantilevered spring member arranged so that the length direction is along the slide direction of the slide portion is brought into contact with the slide portion to slide the slide portion. Unlike the conventional configuration that regulates the band-shaped member, even if a large force is applied in the direction toward the proximal end with respect to the slide during measurement, the band-shaped member does not buckle and As a result of reliably maintaining the engagement state with the recess, sliding of the slide portion during measurement can be reliably prevented. For this reason, according to the clamp sensor and the measuring apparatus, it is possible to reliably prevent a situation in which the measured value of the current as the electrical parameter fluctuates (fluctuates) due to the two sensors not being opposed to each other. it can.

  In the clamp sensor according to claim 3 and the measuring device according to claim 5, only one end located on the base end side of the belt-like member is fixed to the outer wall and the other end located on the tip end side. A restricting convex portion is disposed at the end. For this reason, according to the clamp sensor and the measuring apparatus, when a force is applied in the direction toward the base end side with respect to the slide portion, a force in the pulling direction is applied to the belt-like member. However, even if a large force is applied in the direction toward the base end side, it is possible to reliably prevent the belt-like member from buckling or bending. Therefore, according to the clamp sensor and the measuring device, the engagement state between the restricting convex portion and the restricting concave portion is more reliably maintained, so that sliding of the slide portion during measurement can be more reliably prevented. .

  Moreover, according to the clamp sensor of Claim 4, and the measuring apparatus of Claim 5, compared with the structure which forms both separately by forming the slide part and the strip | belt-shaped member integrally, strip | belt-shaped. Since the step of attaching (fixing) the member to the slide portion can be made unnecessary, the manufacturing cost of the clamp sensor and the measuring device can be sufficiently reduced.

1 is a configuration diagram showing a configuration of a current measuring device 1. FIG. 3 is a side view of the clamp sensor 3. FIG. 4 is a plan view of the clamp sensor 3. FIG. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 3 is a horizontal sectional view of the clamp sensor 3 in a slide-restricted state (a cross-sectional view taken along line AA in FIG. 2). It is a horizontal sectional view of clamp sensor 3 in the state where slide regulation was canceled. It is a horizontal sectional view of clamp sensor 3 in the state where the 1st sensor 22 and the 2nd sensor 24 do not counter. It is a horizontal sectional view of clamp sensor 103 in a slide regulation state. It is a horizontal sectional view of clamp sensor 103 in the state where slide regulation was canceled.

  Hereinafter, embodiments of a clamp sensor and a measuring apparatus will be described with reference to the accompanying drawings.

  First, the configuration of a current measuring device 1 as an example of a measuring device will be described with reference to the drawings. The current measuring apparatus 1 shown in FIG. 1 is configured to be able to measure a current (an example of an electrical parameter) flowing through an electric wire 200 (see FIG. 7) as a detection target, for example. Specifically, the current measuring device 1 includes a device main body 2 and a clamp sensor 3.

  As shown in FIG. 1, the apparatus main body 2 includes a measurement unit 11, an operation unit 12, a display unit 13, and a control unit 14.

  Under the control of the control unit 14, the measurement unit 11 performs a measurement process for measuring the current flowing through the electric wire 200 based on magnetism (an example of a predetermined physical quantity) detected by the clamp sensor 3.

  The operation unit 12 includes various switches, and outputs an operation signal when each switch is operated. The display unit 13 displays a measured current value and the like under the control of the control unit 14. The control unit 14 controls each unit constituting the apparatus main body 2 according to an operation signal output from the operation unit 12.

  The clamp sensor 3 is a clamp sensor that detects magnetism as an example of a physical quantity in a state where the electric wire 200 as a detection target is clamped (sandwiched). As shown in FIGS. A sensor (sensor unit) 22, a slide unit 23, a second sensor (sensor unit) 24, a coil spring 25, and an operation unit 26 are provided.

  As shown in FIG. 2, the main body 21 includes a lower case 31 and an upper case 32 and is formed in an elongated box shape. As shown in FIG. 4, an accommodation portion 41 that accommodates the first sensor 22 is formed at the distal end portion 31 a of the lower case 31 (the distal end portion 21 a of the main body portion 21). Further, a concave portion (groove portion) 42 having a “U” -shaped cross section into which the electric wire 200 is fitted when the electric wire 200 (see FIG. 7) is clamped is formed at the distal end portion 31 a of the lower case 31.

  Further, as shown in FIG. 4, on the distal end portion 32 a side (the distal end portion 21 a side of the main body portion 21) of the upper case 32, the slide portion 23 is accommodated in a slidable state, and the accommodation portion that accommodates the coil spring 25. 43 is formed. Further, an opening 32 d for projecting the tip 23 a of the slide portion 23 toward the tip 31 a of the lower case 31 is formed in the tip 32 a of the upper case 32.

  Further, as shown in FIG. 5, a restriction recess 45 is formed on the inner surface 44 of the side wall 32 c in the upper case 32 constituting the housing portion 43. The restricting recess 45 is configured to be capable of engaging with a restricting protrusion 71 formed (arranged) on a belt-like member 61 described later (see FIG. 5).

  In this case, as shown in FIG. 5, the portion on the base end 21 b side (base end 32 b side of the upper case 32) of the main body 21 with respect to the portion where the restriction recess 45 is formed in the housing portion 43 is the base end. It is formed so as to increase in width toward the 21b side (hereinafter, this portion is also referred to as “wide portion 46”). As shown in FIG. 7, the wide portion 46 restricts the band-shaped member 61 in a state where the slide portion 23 is positioned on the base end portion 21 b side of the main body portion 21 (base end portion 32 b side of the upper case 32). It has a function of smoothly sliding the slide portion 23 while avoiding contact between the convex portion 71 for use and the side wall 32c.

  The first sensor 22 is a magnetic core as an example, and is accommodated in the accommodating portion 41 of the lower case 31 in the main body portion 21 as shown in FIG. 4. In this case, the first sensor 22 constitutes one magnetic sensor together with the second sensor 24, and detects magnetism in a state where the first sensor 22 and the second sensor 24 face each other (a state where they are abutted with each other). That is, the 1st sensor 22 and the 2nd sensor 24 are equivalent to the half of one magnetic sensor, respectively.

  The slide part 23 is slidably accommodated in the accommodating part 43 of the upper case 32 in the main body part 21. Further, as shown in FIG. 4, an accommodating portion 51 that accommodates the second sensor 24 is formed at the distal end portion 23 a of the slide portion 23. In addition, the slide portion 23 is in a slide direction (the length direction of the main body portion 21, hereinafter also referred to as “X direction”) (see the same figure) connecting the distal end portion 21 a and the base end portion 21 b of the main body portion 21. Along the main body portion 21, the main body portion 21 can slide relative to the main body portion 21. In this case, as shown in FIGS. 2 and 4, the first sensor 22 and the second sensor are in a state in which the slide portion 23 is slid to the distal end portion 21 a side (the distal end portion 31 a side of the lower case 31) of the main body portion 21. 24 are opposed to each other, and in a state where the slide portion 23 is slid to the base end portion 21b side of the main body portion 21 (base end portion 31b side of the lower case 31), both sensors 22 and 24 are in a non-opposing state. .

  A belt-like member 61 is disposed on the slide portion 23. As shown in FIG. 5, the belt-like member 61 is formed in a belt shape and extends along the outer wall 23 c of the slide portion 23 facing the inner surface 44 of the side wall 32 c in the upper case 32 of the main body portion 21 ( Specifically, the length direction is arranged along the slide direction (X direction). Further, the band-shaped member 61 is a portion (non-fixed portion) excluding the base end portion 61b, in which only the base end portion 61b (one end portion located on the base end portion 21b side of the main body portion 21) is fixed to the outer wall 23c. Is configured to be deformable (elastically deformed in this example) so as to be displaced toward the inside of the slide portion 23 (in the figure, the central portion in the width direction of the slide portion 23). That is, the belt-like member 61 is formed in a cantilever shape with the base end portion 61b fixed.

  Further, as shown in FIG. 5, a restriction convex portion 71 is provided at the distal end portion 61 a of the belt-like member 61 (corresponding to a non-fixed portion, in this example, the end portion located on the distal end portion 21 a side of the main body portion 21). And the release convex part 72 is formed (arranged). The restricting convex portion 71 protrudes toward the inner surface 44 of the side wall 32 c in the upper case 32, and the inner surface 44 is in a state where the slide portion 23 is positioned on the distal end portion 21 a side of the main body portion 21 and the band-shaped member 61 is not deformed. It engages with the restriction recess 45 formed in the. The release convex part 72 protrudes toward an outer surface 62c described later in the operation part 26, and is deformed so that the front end part 61a (non-fixed part) of the belt-like member 61 is displaced toward the inside of the slide part 23. In the state, it is disposed (positioned) in a release recess 82 described later in the operation unit 26.

  Moreover, in this clamp sensor 3, the slide part 23 and the strip | belt-shaped member 61 are integrally formed. Specifically, in the clamp sensor 3, the belt-like member 61 is configured by cutting into the outer wall 23 c of the slide portion 23. That is, the belt-like member 61 is formed by a part of the outer wall 23c.

  The second sensor 24 is a magnetic core as an example, and is accommodated in the accommodating portion 51 of the slide portion 23 (disposed at the distal end portion 23a of the slide portion 23) as shown in FIG.

  The coil spring 25 functions as an urging member and is accommodated in the accommodating portion 43 of the upper case 32 in the main body portion 21 as shown in FIG. In this case, the coil spring 25 biases the slide portion 23 toward the distal end portion 21 a side of the main body portion 21.

  The operation part 26 slides to the base end part 21b side of the main body part 21 of the slide part 23 located on the distal end part 21a side of the main body part 21 (hereinafter also simply referred to as “slide to the base end part 21b side”). 4), and is housed in the slide portion 23 so as to be slidable relative to the slide portion 23 along the X direction, as shown in FIGS. (Arrangement).

  In addition, a protrusion 81 (see FIG. 4) is formed on the upper portion of the operation portion 26 so as to protrude above the slide portion 23 and function as a knob when the operation portion 26 is slid. Further, as shown in FIG. 5, the release convex portion 72 of the belt-like member 61 can enter and be disposed inside the outer surface 62 c of the operation portion 26 facing the outer wall 23 c of the slide portion 23. A release recess 82 is formed.

  The operation unit 26 has a function of performing the slide restriction of the slide part 23 toward the base end part 21b side and the release of the slide restriction. Specifically, the operation unit 26 regulates deformation of the band-shaped member 61 in a state where the operation unit 26 is slid to the distal end 21 a side of the main body unit 21, and regulates the convex part 71 for regulating the band-shaped member 61 and the upper case 32. The engagement state with the recessed part 45 is maintained, and the sliding of the slide part 23 to the base end part 21b side is controlled. Further, when the operation portion 26 is slid to a predetermined position on the base end portion 21b side, the deformation of the belt-like member 61 due to the arrangement of the release protrusion 72 of the belt-like member 61 into the release recess 82 is performed. It has a function of releasing the restriction of the slide of the slide part 23 toward the base end part 21b by permitting and releasing the engagement between the restriction convex part 71 and the restriction concave part 45.

  Next, a method for using the current measuring device 1 will be described with reference to the drawings. In the initial state, as shown in FIGS. 4 and 5, the slide portion 23 of the clamp sensor 3 is positioned on the distal end portion 21 a side of the main body portion 21, and the operation portion 26 is slid toward the distal end portion 21 a side of the main body portion 21. It is assumed that

  First, the operation unit 12 of the apparatus main body 2 is operated to turn on the power, and then the electric wire 200 (see FIG. 7) as a measurement object is clamped by the clamp sensor 3. In this case, in the initial state, as described above, the slide portion 23 of the clamp sensor 3 is positioned on the distal end portion 21 a side of the main body portion 21, and the operation portion 26 is slid to the distal end portion 21 a side of the main body portion 21. . In this state, as shown in FIG. 5, the restriction convex portion 71 formed at the front end portion 61 a of the belt-like member 61 and the restriction concave portion 45 formed at the side wall 32 c of the upper case 32 in the main body portion 21 are formed. Is engaged.

  In addition, the outer surface 62c of the operation portion 26 comes close to the release convex portion 72 formed at the distal end portion 61a of the belt-like member 61, and the deformation of the belt-like member 61 is restricted. The engagement state with the concave portion 45 is maintained, and the sliding of the slide portion 23 toward the base end portion 21b side of the main body portion 21 is restricted. For this reason, first, this state (slide regulation state) is canceled.

  Specifically, the operation part 26 is slid to the base end part 21 b side of the main body part 21 by placing a fingertip on the protrusion 81 (see FIGS. 2 to 4) of the operation part 26. At this time, as shown in FIG. 6, a position where the release recess 82 formed on the outer surface 62 c of the operation portion 26 and the release projection 72 of the belt-like member 61 face each other (predetermined on the base end 21 b side). When the operation unit 26 is slid to the position (hereinafter also referred to as “release position”), the release convex portion 72 can be disposed in the release concave portion 82. Further, when the operation portion 26 is slid to the release position, the base end portion 62b of the operation portion 26 comes into contact with the base end portion 23b of the slide portion 23 as shown in FIG.

  Then, the operation part 26 is further slid to the base end part 21b side. At this time, the restricting convex portion 71 abuts against the edge portion (the right edge portion in FIG. 6) of the restricting concave portion 45 and is pressed toward the inner side of the slide portion 23, and this pressing force causes the band-shaped member 61 to move. The band-shaped member 61 is deformed so that the tip end portion 61 a side is displaced toward the inside of the slide portion 23, whereby the release convex portion 72 is disposed in the release concave portion 82. That is, the arrangement of the release convex portion 72 in the release concave portion 82 is allowed and the deformation of the belt-like member 61 is allowed.

  Further, when the belt-like member 61 is deformed and the distal end portion 61a is displaced toward the inside of the slide portion 23, the engagement between the regulating convex portion 71 and the regulating concave portion 45 is released, and thereby the proximal end portion 21b. The restriction of the slide of the slide part 23 to the side is released. Further, since the base end portion 62b of the operation portion 26 and the base end portion 23b of the slide portion 23 are in contact with each other, the slide portion 23 is slid toward the base end portion 21b as the operation portion 26 slides.

  Next, when the operation portion 26 is further slid to the base end portion 21b side, the slide portion 23 is slid to the base end portion 21b side together with the operation portion 26 as shown in FIG. The convex portion 71 is located in the wide portion 46 of the upper case 32. In this state, the deformation of the belt-like member 61 is released (becomes a non-deformed state), and the restricting convex portion 71 and the side wall 32c are maintained in a non-contact state, and the slide portion 23 is smoothly slid. .

  Subsequently, when the base end portion 61b of the belt-like member 61 and the base end portion 23b of the slide portion 23 are located at the end of the housing portion 43 on the base end portion 21b side, as shown in FIG. The second sensor 24 is in a non-opposing state. Next, while maintaining this state, the electric wire 200 is fitted into the recess 42 (see FIG. 4) formed in the tip 31a of the lower case 31, as shown in FIG. Subsequently, the force applied to the protruding portion 81 of the operation portion 26 in order to position the slide portion 23 on the base end portion 21 b side of the main body portion 21 is relaxed. At this time, the slide portion 23 is slid together with the operation portion 26 toward the distal end portion 21 a side of the main body portion 21 by the biasing force of the coil spring 25 that biases the slide portion 23 toward the distal end portion 21 a.

  Next, when the restricting convex portion 71 of the belt-like member 61 is positioned at the portion on the distal end portion 21a side of the wide portion 46 as the slide portion 23 slides, the base end portion of the restricting concave portion 45 on the side wall 32c of the upper case 32 is obtained. The restricting convex portion 71 is pressed toward the inner side of the slide portion 23 by the edge portion on the 21b side. In this case, since the release concave portion 82 of the operation portion 26 and the release convex portion 72 of the strip member 61 are opposed to each other, the distal end portion 61a side of the strip member 61 is brought into the slide portion 23 by the pressing force from the side wall 32c. The belt-shaped member 61 is deformed so as to be displaced toward the surface.

  Subsequently, when the slide portion 23 and the belt-like member 61 are further slid to the tip portion 21a side, as shown in FIG. 6, the first sensor disposed at the tip portion 31a of the lower case 31 in the main body portion 21. 22 and the 2nd sensor 24 arrange | positioned at the front-end | tip part 23a of the slide part 23 oppose.

  Next, as illustrated in FIG. 5, only the operation unit 26 is further slid toward the distal end portion 21 a (the operation unit 26 is slid relative to the slide unit 23). At this time, as shown in the figure, the release concave portion 82 of the operation portion 26 and the release convex portion 72 of the belt-like member 61 are not opposed to each other, and the outer surface 62 c of the operation portion 26 is close to the release convex portion 72. To do. For this reason, the deformation of the belt-like member 61 is restricted, whereby the engagement state between the restriction convex part 71 and the restriction concave part 45 is maintained, and the slide part 23 slides toward the base end part 21 b side of the main body part 21. Is regulated.

  Thus, the clamping of the electric wire 200 is completed. Subsequently, the clamp sensor 3 detects the magnetism generated by the current flowing through the electric wire 200 being clamped by the first sensor 22 and the second sensor 24 and outputs a detection signal.

  Here, for example, the distal end portion of the cantilever spring member arranged so that the length direction thereof is along the sliding direction of the slide portion 23 is brought into contact with the slide portion 23 to slide the slide portion 23 toward the proximal end portion 21b. In the configuration that restricts the slide (conventional configuration), a large force is applied to the slide portion 23 in the direction toward the proximal end portion 21b, and the spring member is moved when the force is applied in the length direction of the spring member. There is a possibility of buckling, and there is a risk that the restriction of the slide of the slide portion 23 toward the base end portion 21b will be released.

  On the other hand, in the clamp sensor 3, the slide is regulated by the engagement between the regulation convex part 71 and the regulation concave part 45, and a large force is exerted in the direction toward the base end part 21b with respect to the slide part 23. As a result, the engagement state between the restricting convex portion 71 and the restricting concave portion 45 is reliably maintained without causing buckling of the belt-like member 61, so that the slide restriction of the slide portion 23 is reliably released. It is possible to prevent.

  Next, the operation unit 12 is operated to instruct the start of measurement. At this time, the control unit 14 controls the measurement unit 11 to execute measurement processing. In this measurement process, the measurement unit 11 measures the current flowing through the electric wire 200 based on the detection signal (magnetism detected by the clamp sensor 3) output from the clamp sensor 3. Subsequently, the control unit 14 controls the display unit 13 to display the value of the current measured by the measurement unit 11. Thus, the measurement of the current flowing through the electric wire 200 is completed.

  On the other hand, when the measurement is completed and the clamp of the electric wire 200 is released, as described above, the operation portion 26 is slid toward the proximal end portion 21b of the main body portion 21 to thereby move the proximal end portion 21b of the slide portion 23. Release the side slide restriction. And the slide part 23 is slid to the base end part 21b side. Next, while maintaining this state, the electric wire 200 fitted in the recess 42 of the tip 31 a in the lower case 31 is removed from the recess 42. Thus, measurement of the current flowing through the electric wire 200 is completed.

  As described above, in the clamp sensor 3 and the current measuring device 1, the restriction convex portion 71 that can be engaged with the restriction concave portion 45 of the main body portion 21 and the release convex portion that can be disposed in the release concave portion 82 of the operation portion 26. 72 includes a belt-like member 61 formed on the distal end portion 61a, and the operation portion 26 is configured to include a regulating convex portion 71 and a regulating concave portion 45 in response to sliding toward the distal end portion 21a side and the proximal end portion 21b of the main body portion 21. The engagement state is maintained and released to restrict the slide of the slide portion 23 toward the base end portion 21b and release the restriction. For this reason, according to the clamp sensor 3 and the current measuring device 1, the tip of the cantilevered spring member arranged so that the length direction is along the slide direction of the slide portion is brought into contact with the slide portion to slide. Unlike the conventional configuration that restricts the sliding of the belt portion, even if a large force is applied to the slide portion 23 in the direction toward the base end portion 21b during measurement, the belt-like member 61 is not buckled. As a result of reliably maintaining the engagement state between the convex portion 71 and the restricting concave portion 45, it is possible to reliably prevent the slide portion 23 from sliding during the measurement. Therefore, according to the clamp sensor 3 and the current measuring device 1, it is possible to reliably prevent a situation where the measured value of the current as the electrical parameter fluctuates (fluctuates) due to the two sensors not being opposed to each other. be able to.

  In the clamp sensor 3 and the current measuring device 1, only the base end portion 61 b of the belt-like member 61 located on the base end portion 21 b side of the main body portion 21 is fixed to the outer wall 23 c of the slide portion 23, and the main body portion 21. The restricting convex portion 71 is disposed at the distal end portion 61a of the belt-like member 61 located on the distal end portion 21a side. Therefore, according to the clamp sensor 3 and the current measuring device 1, when a force is applied to the slide portion 23 in the direction toward the proximal end portion 21b, a force in the pulling direction is applied to the belt-like member 61. Even if a large force is applied to the slide portion 23 in the direction toward the base end portion 21b during the measurement, it is possible to reliably prevent the belt-like member 61 from buckling or bending. Therefore, according to the clamp sensor 3 and the current measuring device 1, as a result of the engagement state between the regulating convex portion 71 and the regulating concave portion 45 being more reliably maintained, the sliding of the slide portion 23 during measurement is more reliably performed. Can be prevented.

  Further, according to the clamp sensor 3 and the current measuring device 1, the slide member 23 and the belt-like member 61 are integrally formed, so that the belt-like member 61 is compared with the configuration in which both are formed separately. Since the process of attaching (fixing) to 23 can be made unnecessary, the manufacturing cost of the clamp sensor 3 and the current measuring device 1 can be sufficiently reduced.

  Note that the configurations of the clamp sensor and the measuring apparatus are not limited to the above configurations. For example, the clamp sensor 103 shown in FIG. 8 can be employed. In addition, about the same component as the above-mentioned clamp sensor 3, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, the clamp sensor 103 includes a band-shaped member 161 instead of the above-described band-shaped member 61, and includes an operation unit 126 instead of the above-described operation unit 26. The band-shaped member 161 is disposed so as to extend along the outer wall 23c of the slide portion 23, and only the base end portion 161b (one end portion located on the base end portion 21b side of the main body portion 21) is formed on the outer wall 23c. It is formed in a cantilever shape that is fixed and can be deformed (elastically deformed in this example) so that the non-fixed portion except the base end portion 161b is displaced toward the inner surface 44 of the upper case 32. Also in this configuration, the slide portion 23 and the belt-like member 161 are integrally formed.

  Further, as shown in FIG. 8, a restriction convex portion 71 and a release convex portion 72 are formed (arranged) at the leading end portion 161 a of the band-shaped member 161. In this case, the restricting convex portion 71 protrudes toward the inner surface 44 of the upper case 32 and engages with the restricting concave portion 45 formed on the inner surface 44 in a state where the distal end portion 161a is deformed. Further, the release convex portion 72 protrudes toward the outer surface 162c of the operation portion 126, and the operation portion 126 will be described later in a state where the distal end portion 161a (non-fixed portion) of the band-shaped member 161 is not deformed (non-deformed state). It is disposed (positioned) in the recess 182 for release.

  As shown in FIG. 8, the operation unit 126 is accommodated (arranged) in the accommodating portion 43 of the slide portion 23 so as to be slidable relative to the slide portion 23. In addition, a release recess 182 in which the release projection 72 of the strip member 161 is located in the non-deformed state of the strip member 161 is formed on the distal end 162 a side of the outer surface 162 c of the operation unit 126.

  The operation unit 126 has a function of restricting slide of the slide part 23 toward the base end 21b side and releasing the slide restriction. Specifically, as illustrated in FIG. 8, the operation unit 126 deforms the band member 61 in a state where the operation unit 126 is slid to the distal end portion 21 a side of the main body unit 21, thereby The sliding state of the slide portion 23 toward the base end portion 21b is restricted while maintaining the engagement state of the case 32 with the restriction recess 45. Further, as shown in FIG. 9, when the operation unit 126 is slid to a predetermined position on the base end 21 b side, the operation unit 126 allows the release convex portion 72 to be disposed in the release concave portion 182 ( The release convex portion 72 is positioned in the release concave portion 182), and the belt-like member 161 is returned to the non-deformed state (the deformed state is released), whereby the restriction convex portion 71 and the restriction concave portion 45 are The engagement is released and the restriction of the slide of the slide portion 23 toward the base end portion 21b is released.

  In this clamp sensor 103 as well, a conventional configuration that regulates sliding of the sliding portion by bringing the tip of a cantilevered spring member arranged so that the length direction thereof is along the sliding direction of the sliding portion into contact with the sliding portion. Unlike the case, even if a large force is applied to the slide portion 23 in the direction toward the proximal end portion 21b of the main body portion 21 during measurement, the band-shaped member 161 does not buckle and the regulating convex portion 71 and As a result of reliably maintaining the engagement state with the restricting recess 45, sliding of the slide portion 23 during measurement can be reliably prevented. Therefore, according to the clamp sensor 3 and the current measuring device 1, it is possible to reliably prevent a situation where the measured value of the current as the electrical parameter fluctuates (fluctuates) due to the two sensors not being opposed to each other. be able to.

  Further, both the distal end portions 61a and 161a and the proximal end portions 61b and 161b of the belt-like members 61 and 161 are fixed to the outer wall 23c of the slide portion 23, and the non-fixed portions other than the distal end portions 61a and 161a and the proximal end portions 61b and 161b. It is also possible to adopt a configuration in which the (center portion in the length direction) is formed to be displaceable.

  In addition, the example using the elastically deformable belt-like members 61 and 161 has been described above. However, the belt-like member is formed of a material that does not elastically deform (hard to elastically deform), and the base end portion of the belt-like member can be rotated by a hinge or the like. It is also possible to adopt a configuration in which the non-fixed portion excluding the base end portion is deformed (that is, rotated) by being fixed to the slide portion 23.

  Moreover, although the example which formed the recessed part 45 for control in the inner surface 44 of the side wall 32c in the upper case 32 of the main-body part 21 was mentioned above, the inner surface of the upper wall part in the upper case 32 (the inner surface which comprises the accommodating part 43: hereinafter " It is also possible to adopt a configuration in which a restriction recess is formed on the top surface). In this configuration, the belt-shaped member is disposed so as to extend along the outer wall of the upper portion of the slide portion 23 facing the top surface of the upper case 32. Further, in this configuration, a release concave portion is formed on the outer surface of the operation portions 26 and 126 facing the outer wall on the upper portion of the slide portion 23.

  Further, the example in which the slide portion 23 and the belt-like members 61 and 161 are integrally formed has been described above. However, the distal portions 61a and 161a and the base end portions 61b and 161b of the belt-like members 61 and 161 are formed separately. It is also possible to adopt a configuration in which at least one of these is fixed to the slide portion 23 by welding or using a screw or an adhesive. In this case, in this configuration, the slide portion 23 and the belt-like members 61 and 161 can be formed of different materials (for example, the slide portion 23 is made of resin and the belt-like members 61 and 161 are made of metal).

DESCRIPTION OF SYMBOLS 1 Current measuring device 1,103 Current measuring device 3 Clamp sensor 11 Measuring part 21 Main part 21a, 61a, 161a Tip part 21b, 61b, 161b Base end part 22 First sensor 23 Slide part 23c Outer wall 24 Second sensor 26, 126 Operation part 43 Storage part 44 Inner surface 45 Recessing concave part 61,161 Band-shaped member 71 Restricting convex part 72Relieving convex part 82,182 Recessing concave part

Claims (5)

A clamp sensor having a pair of sensor parts that can face each other,
A main body portion in which one of the sensor portions is disposed at the distal end portion, and a sliding direction connecting the distal end portion and the base end portion of the main body portion in which the other of the sensor portions is disposed. A slide portion accommodated in the main body portion so as to be slidable relative to the main body portion, and disposed inside the slide portion so as to be slidable relative to the slide portion along the sliding direction. And an operation unit for performing an operation of restricting the slide to the base end side of the slide part located on the distal end side and releasing the restriction of the slide,
On the inner surface of the main body, a restriction recess is formed,
An end portion of the slide portion is fixed to the outer wall so as to extend along the outer wall of the slide portion facing the inner surface, and an unfixed portion excluding the end portion is directed toward the inside of the slide portion. A belt-shaped member that can be deformed so as to be displaced
A recess for release is formed on the outer surface of the operation portion that faces the outer wall,
The non-fixed portion of the band-shaped member protrudes toward the inner surface and engages with the restriction concave portion in the non-deformed state of the band-shaped member, and the band-shaped member protrudes toward the outer surface. And a release protrusion disposed in the release recess in the deformed state,
The operation portion regulates deformation of the belt-like member in a state where the operation portion is slid to the distal end portion side, maintains the engagement state between the restriction convex portion and the restriction concave portion, and moves toward the proximal end portion side. The sliding portion of the belt-like member is restricted, and when the sliding portion is slid to a predetermined position on the base end portion side, the releasing convex portion is allowed to be placed in the releasing concave portion, and A clamp sensor that permits deformation and releases the engagement between the restriction convex portion and the restriction concave portion to release the restriction of the slide of the slide portion toward the base end side. A clamp sensor having a pair of sensor parts that can face each other,
A main body portion in which one of the sensor portions is disposed at the distal end portion, and a sliding direction connecting the distal end portion and the base end portion of the main body portion in which the other of the sensor portions is disposed. A slide portion accommodated in the main body portion so as to be slidable relative to the main body portion, and disposed inside the slide portion so as to be slidable relative to the slide portion along the sliding direction. An operation unit for performing a slide restriction to the base end side of the slide part located on the distal end side and a restriction release operation of the slide,
On the inner surface of the main body, a restriction recess is formed,
In the slide portion, an end portion is fixed to the outer wall so as to extend along the outer wall of the slide portion facing the inner surface, and a non-fixed portion excluding the end portion is displaced toward the inner surface. A deformable belt-like member is provided,
A recess for release is formed on the outer surface of the operation portion that faces the outer wall,
The non-fixed portion of the band-shaped member protrudes toward the inner surface and engages with the restriction concave portion in a deformed state of the band-shaped member, and protrudes toward the outer surface and protrudes toward the outer surface. A release convex portion arranged in the release concave portion in a non-deformed state,
The operation portion is configured to deform the belt-like member in a state of being slid to the distal end portion side and maintain the engagement state between the restricting convex portion and the restricting concave portion, and to the base end portion side. When the slide of the slide portion is regulated and is slid to a predetermined position on the base end side, the release convex portion is allowed to be placed in the release concave portion and the belt-like member is not deformed. A clamp sensor that returns to the state of the above, releases the engagement between the restriction convex portion and the restriction concave portion, and releases the restriction of the slide of the slide portion toward the base end portion.   In the belt-like member, only one end located on the base end side is fixed to the outer wall, and the restricting convex portion is disposed on the other end located on the tip end side. Item 3. The clamp sensor according to item 1 or 2.   The clamp sensor according to any one of claims 1 to 3, wherein the slide portion and the belt-shaped member are integrally formed.   A measuring apparatus comprising: the clamp sensor according to claim 1; and a measurement unit that measures an electrical parameter based on a physical quantity detected by the clamp sensor.

Images