Clamp sensor and measuring device

Abstract

The purpose of the present invention is to form a state in which two core members are joined with a sufficient magnetic bonding force while achieving a reduction in size. The present invention is provided with: a first core member (21) that constitutes a part of a magnetic core (20) arranged annularly in the circumferential direction; and a second core member (22) that constitutes the other part, in which a first protrusion protruding in the circumferential direction is provided at the distal end (P21a, P21b) of the member (21) in the circumferential direction and a second protrusion protruding in the circumferential direction is provided at the distal end (P22a, P22b) of the member (22) in the circumferential direction, and in a closed state, the first protrusion and the second protrusion protrude in the circumferential direction. The first protrusion on the tip (P21a) side and the second protrusion on the tip (P22a) side overlap in the insertion direction, and the first protrusion on the tip (P21b) side and the second protrusion on the tip (P22b) side overlap in the insertion direction.

Description

Technical Field

[0001] The present invention relates to a clamp sensor having a magnetic core including two core members and arranged in a ring shape in a closed state, and a measuring device including the clamp sensor. Background Art

[0002] As such a clamp-type sensor, the applicant disclosed a clamp-type sensor in the following patent document, which comprises: a main body portion, in which a first core unit is arranged in a clamping portion provided at one end side of a main body box; and a sliding portion, in which a second core unit is arranged at one end side (top end portion) of a sliding box provided so as to be able to slide along the length direction of the main body portion.

[0003] In this clamp sensor, the structure is such that the slide box can be slid relative to the main body box to an open position or a closed position by making the slide knob of the slide box protrude from the long hole-shaped window portion formed in the main body box and moving the slide knob along the length direction of the main body. In this case, the first core unit has a first sensor part, which has: a U-shaped first core that forms a part of the magnetic circuit; and a shielding body that is arranged to surround the first core. In addition, the second core unit has a second sensor part, which has: a rectangular second core that forms the other part of the magnetic circuit; and a shielding body that is arranged to surround the second core.

[0004] In addition, in the clamp type sensor, the end faces of the two legs of the first core are formed into a flat surface so as to be in contact with the side surface of the second core. In addition, in the clamp type sensor, the following structure is adopted: when the slide box slides to the closed position, the second core unit arranged in the slide box applies force toward the first core unit arranged in the main body box.

[0005] When the clamp sensor is used to detect the current or other detected quantity flowing through the detection object (e.g., an electric wire), the wire of the detection object is inserted into the clamping portion (slit) of the main body while the slide box is slid to the open position. Next, the slide box is slid to the closed position to clamp the detection object. At this time, the second core unit applies force toward the first core unit, so that the side surface of the second core and the end surface of the two legs of the first core are in surface contact and close contact. Thus, a ring-shaped closed magnetic circuit is formed around the detection object by the first core and the second core, and the magnetic field generated by the current flowing through the detection object can be detected.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2016-045187 (pp. 8-20, Figure 1-Figure 3 7) Summary of the invention

[0009] Problems to be solved by the invention

[0010] However, the clamp-type sensor disclosed by the applicant has the following problems that should be improved. Specifically, in the clamp-type sensor disclosed by the applicant, the following structure is adopted: when the sliding box is slid to the closed position, the second core unit applies force toward the first core unit, thereby the side surface of the second core is closely attached to the end surface of the two legs of the first core, and a ring-shaped closed magnetic circuit is formed around the detection object through the first core and the second core.

[0011] In this case, the clamp sensor disclosed by the applicant adopts a sliding structure. As a result, compared with a clamp sensor having a structure in which the clamp arm is rotated around a rotating shaft to open and close, the space required to be in the open state is narrow, so the detection object can be easily clamped in a narrow place. However, in order to reliably and easily clamp the detection object in a narrow place, it is necessary to further miniaturize the clamp sensor. Therefore, in this clamp sensor, it is also necessary to reduce the cross-sectional area of ​​the magnetic core used to form an annular closed magnetic circuit around the detection object (the cross-sectional area in the direction intersecting the annular closed magnetic circuit). As a result, there is a tendency that it is difficult to combine the first core and the second core (a pair of core members) constituting the magnetic core with sufficient magnetic binding force. Therefore, it is preferable to improve this point.

[0012] In addition, in the clamp-type sensor, when an unexpected external force is applied to the main box or the sliding box in the state of clamping the detection object, sometimes a small deformation occurs in the two boxes. In this case, the first core and the second core contained in the box are tilted, and it may be difficult to maintain the first core and the second core in contact with each other. In addition, when using the clamp-type sensor disclosed by the applicant to detect the detected quantity, sometimes a small foreign object is sandwiched between the end faces of the two legs of the first core and the side faces of the second core. In this case, a small gap corresponding to the size of the foreign object is generated between the first core and the second core.

[0013] Thus, in the clamp-type sensor disclosed by the applicant, when the box containing the two cores is deformed or a foreign object is inserted between the end faces of the two cores, the contact area between the first core and the second core becomes smaller or an unexpected small gap is generated in the annular closed magnetic circuit for detecting the detected quantity, and the magnetic binding force between the first core and the second core may be reduced. In addition, the size of the gap generated in the closed magnetic circuit may also change depending on the degree of deformation generated in the box and the size of the foreign object inserted. Therefore, it is preferable to improve this point.

[0014] The present invention is made in view of such problems to be improved, and its main purpose is to provide a clamp-type sensor that can be miniaturized and can make two core members connected with sufficient magnetic binding force, and a measuring device equipped with such a clamp-type sensor. Another purpose is to provide a clamp-type sensor that can clamp a conductor to be detected without generating an unexpected gap in a closed magnetic circuit formed around the conductor to be detected, and a measuring device equipped with such a clamp-type sensor.

[0015] Solutions for solving problems

[0016] The clamp sensor of the present invention comprises: a first core member and a second core member, the first core member constituting a part of a magnetic core configured as a ring in a closed state, the second core member being formed separately from the first core member and constituting the other part of the magnetic core in the circumferential direction; and a first box and a second box, the first box accommodating the first core member, the second box being configured to be able to slide relative to the first box and accommodating the second core member, the clamp sensor being configured such that the magnetic core configured as a ring in the closed state when viewed along the insertion direction of the detection object conductor relative to the magnetic core When the core is inserted into the magnetic core, the second box can slide relative to the first box along a virtual straight line intersecting the inner circumferential side edge of the magnetic core at either of the two end portions of the first core component in the circumferential direction, and the first convex portion protruding along the circumferential direction is provided at the end of at least one of the two end portions of the first core component in the circumferential direction, and the second convex portion protruding along the circumferential direction is provided at the end of at least one of the two end portions of the second core component in the circumferential direction, and the clamp sensor is configured such that, when the magnetic core is configured in an annular shape while being transformed into the closed state, the first convex portion and the second convex portion overlap in the insertion direction.

[0017] Furthermore, a measuring device of the present invention includes: the clamp sensor described above; and a measuring unit that measures a predetermined measured quantity based on a detection quantity obtained by the clamp sensor regarding the detection target conductor inserted into the magnetic core in the insertion direction.

[0018] Therefore, according to the clamp sensor and measuring device of the present invention, compared with a clamp sensor having a structure in which the two ends of the first core member and the two ends of the second core member in the circumferential direction are respectively formed into planes that run straight along the circumferential direction, and the end face of the first core member is in surface contact with the end face of the second core member in the closed state, when observed along the insertion direction in the closed state, the contact area between the first core member and the second core member in the closed state can be increased by making the first convex portion of at least one of the two ends of the first core member in the circumferential direction and the second convex portion of at least one of the two ends of the second core member in the circumferential direction overlap (the side surface of the first convex portion and the side surface of the second convex portion) mutually contact. Thus, even if the magnetic core is miniaturized, it can be set to a state in which the first core member and the second core member are combined with sufficient magnetic binding force in the closed state. Thus, the clamp sensor can be further miniaturized and the detection object conductor can be reliably and easily clamped in a narrow place, and the sensitivity of the clamp sensor can be further improved.

[0019] In addition, the clamp sensor of the present invention is constructed such that when the first convex portion is respectively provided at the two end portions in the circumferential direction of the first core member, and the second convex portion is respectively provided at the two end portions in the circumferential direction of the second core member, and when the state is transformed into the closed state and the magnetic core is configured in an annular state, the first convex portion on one end side of the first core member overlaps with the second convex portion on one end side of the second core member in the insertion direction, and the first convex portion on the other end side of the first core member overlaps with the second convex portion on the other end side of the second core member in the insertion direction.

[0020] Therefore, according to the clamp-type sensor and the measuring device of the present invention, the contact area at both ends of the two core members can be increased compared with the configuration in which the first protrusion or the second protrusion is provided only on one end side of the first core member and the second core member. Thus, the magnetic binding force of the first core member and the second core member in the closed state can be fully improved over the entire circumference of the annular magnetic core. Thus, it is possible to appropriately avoid the situation in which a portion having a lower detection sensitivity than other portions is generated at any circumferential position of the magnetic core.

[0021] In addition, the clamp sensor of the present invention is configured such that a plurality of protrusions of at least one of the first protrusion and the second protrusion are arranged in the insertion direction, and a protrusion of the other of the first protrusion and the second protrusion is sandwiched between the plurality of the at least one protrusions.

[0022] Therefore, according to the clamp sensor and the measuring device of the present invention, when the clamp sensor in which a plurality of first protrusions as "at least one protrusion" are arranged in the insertion direction of the detection target conductor relative to the magnetic core is changed from an open state to a closed state by relative sliding of the second box relative to the first box along a virtual straight line, even if a foreign object is attached in a manner sandwiched between the first protrusions adjacent to one end and the other end of the first core member, the foreign object can be pushed away by one end and the other end of the second core member (the second protrusion: the "other protrusion"). In addition, when the clamp sensor in which a plurality of second protrusions as "at least one protrusion" are arranged in the insertion direction of the detection target conductor relative to the magnetic core is changed from an open state to a closed state, even if a foreign object is attached in a manner sandwiched between the second protrusions adjacent to one end and the other end of the second core member, the foreign object can be pushed away by one end and the other end of the first core member (the first protrusion: the "other protrusion"). As a result, a state in which a foreign object is sandwiched between the first core member and the second core member in the closed state can be appropriately avoided. Furthermore, even if an unexpected external force is applied to the first and second boxes in a state where the detection object is clamped and a small deformation occurs in the two boxes, the first core member and the second core member can be kept in contact with each other by making the protruding end of the first protrusion abut against the side surface of the second protrusion and / or the protruding end of the second protrusion abut against the side surface of the first protrusion, and a gap can be appropriately avoided in the annular closed magnetic circuit. Thus, according to the clamp-type sensor and the measuring device, the detected quantity of the detection object conductor can be detected with high accuracy, and the measured quantity can be measured with high accuracy.

[0023] Furthermore, the clamp sensor of the present invention is configured such that, when the second box slides relative to the first box from the closed state to the open state, the second convex portion of the one end side overlaps with the first convex portion of the other end side in the insertion direction. Furthermore, the clamp sensor of the present invention is configured such that, when the second box slides relative to the first box from the closed state to the open state and when the second box slides relative to the first box from the open state to the closed state, the second convex portion of the one end side can pass through a position overlapping with the first convex portion of the other end side in the insertion direction.

[0024] Therefore, according to the clamp sensor and the measuring device of the present invention, the second convex portion on one end side does not abut against the first convex portion on the other end side to hinder the relative sliding of the second box relative to the first box, and the clamp sensor can be transformed into an open state and restored to a closed state. Thus, when the state of inserting the detection object conductor to the inner side of the first core member (the place surrounded by the first core member) can be set to a completely open state between the two ends of the first core member, thereby avoiding the relative movement of the detection object conductor to the inner side of the first core member being hindered by the second core member. In addition, when the state of inserting the detection object conductor to the inner side of the second core member (the place surrounded by the second core member) can be set to a completely open state between the two ends of the second core member, thereby avoiding the relative movement of the detection object conductor to the inner side of the second core member being hindered by the first core member. Therefore, the detection object conductor can be clamped smoothly.

[0025] In addition, the clamp sensor of the present invention comprises: a first shielding member, which is arranged on the outer periphery of the first core member and is accommodated in the first box together with the first core member; and a second shielding member, which is arranged on the outer periphery of the second core member and is accommodated in the second box together with the second core member, the first shielding member is accommodated in the first box in a manner that does not abut against the second core member when the clamp sensor changes from the closed state to the open state and from the open state to the closed state, and the second shielding member is accommodated in the second box in a manner that does not abut against the first core member when the clamp sensor changes from the closed state to the open state and from the open state to the closed state. In addition, the clamp sensor of the present invention comprises: a first shielding member, which is arranged on the outer periphery of the first core member and is accommodated in the first box together with the first core member; and a second shielding member, which is arranged on the outer periphery of the second core member and is accommodated in the second box together with the second core member, the first shielding member being accommodated in the first box in a manner that a first end portion of the two circumferential end portions of the first shielding member located near the first convex portion on the other end side does not abut against the second convex portion on the other end side when the clamp sensor is transformed from the closed state to the open state and from the open state to the closed state, and the second shielding member is accommodated in the second box in a manner that a second end portion of the two circumferential end portions of the second shielding member located near the second convex portion on the one end side does not abut against the first convex portion on the one end side when the clamp sensor is transformed from the closed state to the open state and from the open state to the closed state.

[0026] Therefore, according to the clamp-type sensor and measuring device of the present invention, the relative sliding of the second core member with respect to the first core member will not be hindered by the first shielding member and the second shielding member. The presence of the first shielding member and the second shielding member can appropriately avoid the mixing of noise components into the magnetic core in the closed state.

[0027] In addition, in the clamp sensor of the present invention, the first shielding member is accommodated in the first box in a manner that the first end portion does not abut against the second protrusion on the one end side when the clamp sensor is transformed from the closed state to the open state and from the open state to the closed state, and the second shielding member is accommodated in the second box in a manner that the second end portion does not abut against the first protrusion on the other end side when the clamp sensor is transformed from the closed state to the open state and from the open state to the closed state.

[0028] Therefore, according to the clamp sensor and measuring device of the present invention, the first end of the first shielding member will not abut against the second convex portion of one end side of the second core member or the second end of the second shielding member will not abut against the first convex portion of the other end side of the first core member, thereby preventing the second box from sliding relative to the first box. The clamp sensor can be turned into an open state and restored to a closed state. Thus, when the detection object conductor is inserted into the inner side of the first core member, the relative movement of the detection object conductor to the inner side of the first core member is prevented from being hindered by the second core member and the second shielding member. In addition, when the detection object conductor is inserted into the inner side of the second core member, the relative movement of the detection object conductor to the inner side of the second core member is prevented from being hindered by the first core member and the first shielding member. Therefore, the detection object conductor can be clamped smoothly.

[0029] Furthermore, in the clamp sensor of the present invention, the thickness along the insertion direction of at least one of the two ends, end A located on the first direction side in at least one of the first protrusions and end B located on the first direction side in at least one of the second protrusions, gradually becomes thinner toward the first direction side, wherein the first direction side is the direction in which the second box slides relative to the first box along a virtual straight line when the clamp sensor is changed from the closed state to the open state. Furthermore, in the clamp sensor of the present invention, the magnetic core is formed so that the thickness along the insertion direction of at least one of the two ends, end C located on the second direction side in at least one of the first protrusions and end D located on the second direction side in at least one of the second protrusions, gradually becomes thinner toward the second direction side, wherein the second direction side is the direction in which the second box slides relative to the first box along a virtual straight line when the clamp sensor is changed from the open state to the closed state.

[0030] Therefore, according to the clamp sensor and measuring device of the present invention, when the clamp sensor is changed from a closed state to an open state or from an open state to a closed state, even if the first protrusion and the second protrusion are slightly offset in the insertion direction, the first protrusion and the second protrusion are not easy to abut in the sliding direction, so the second box can slide appropriately relative to the first box.

[0031] Effects of the Invention

[0032] According to the clamp-type sensor and measuring device of the present invention, the contact area between the first core member and the second core member in the closed state can be increased, and even if the magnetic core is miniaturized, the first core member and the second core member can be set to be in a state where the first core member and the second core member are combined with sufficient magnetic binding force in the closed state. As a result, the clamp-type sensor can be further miniaturized and the conductor to be detected can be reliably and easily clamped in a narrow place, and the sensitivity of the clamp-type sensor can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram showing the structure of the measuring device 1.

[0034] Figure 2 It is a perspective view of the appearance of the clamp sensor 3 in the closed state.

[0035] Figure 3 It is a perspective view of the appearance of the clamp sensor 3 in the opened state.

[0036] Figure 4 It is a side view of the tip end portion of the clamp sensor 3 in the closed state.

[0037] Figure 5 It is an explanatory diagram for explaining the first case 11 , the first core member 21 , and the first shield member 41 .

[0038] Figure 6 It is an explanatory diagram for explaining the second case 12 , the second core member 22 , and the second shield member 42 .

[0039] Figure 7 It is a side view of the magnetic core 20 alone.

[0040] Figure 8 It is a front view of the magnetic core 20 alone.

[0041] Fig. 9 It is an exploded perspective view of the magnetic core 20 alone.

[0042] Fig.10 It is an explanatory diagram for explaining the shapes of the top ends P21a and P21b of the plates 25a of the first core members 21a and 21b.

[0043] Fig.11 This is an explanatory diagram for explaining the shapes of the top ends P22a and P22b of the plate 26a of the second core member 22.

[0044] Fig.12 It is a perspective view of the appearance of the shield 40 and the magnetic core 20 in a closed state.

[0045] Fig.13 It is a perspective view of the appearance of the shield 40 and the magnetic core 20 in the opened state.

[0046] Fig.14 It is a perspective view of the external appearance of the magnetic core 20 alone in a closed state.

[0047] Fig.15 This is a perspective view of the external appearance of the magnetic core 20 alone when the state changes from the closed state to the open state and when the state changes from the open state to the closed state.

[0048] Fig.16 This is an explanatory diagram for explaining the positional relationship between the first core members 21 a and 21 b and the second core member 22 and the first shield member 41 and the second shield member 42 of the clamp sensor 3 in the open state.

[0049] Fig.17 The diagram is an explanatory diagram for explaining the positional relationship between the first core members 21 a and 21 b and the second core member 22 and the first shield member 41 and the second shield member 42 of the clamp sensor 3 in the closed state.

[0050] Fig.18 This is an explanatory diagram for explaining the positional relationship between the first core member 21 (plate 25a) and the second core member 22 (plate 26a) when the clamp sensor 3 is opened and closed.

[0051] Fig.19 This is an explanatory diagram for explaining the positional relationship between the first core member 21 (plate 25a) and the second core member 22 (plate 26a) when the clamp sensor 3 is switched to the closed state.

[0052] Fig. 20 This is an explanatory diagram for explaining the positional relationship between the first core member 21 (plate 25a) and the second core member 22 (plate 26a) when the clamp sensor 3 according to another embodiment is opened and closed.

[0053] Fig.21 This is an explanatory diagram for explaining the positional relationship between the first core member 21 (plate 25a) and the second core member 22 (plate 26a) when the clamp sensor 3 according to another embodiment is shifted to the closed state.

[0054] Fig. 22This is an explanatory diagram for explaining the positional relationship between the top ends P41a and P41b of the first shield member 41a and the top ends P42a and P42b of the second shield member 42a when the clamp sensor 3A according to another embodiment is turned into the open state.

[0055] Fig.23 This is an explanatory diagram for explaining the positional relationship between the top ends P41a and P41b of the first shield member 41a and the top ends P42a and P42b of the second shield member 42a when the clamp sensor 3A according to another embodiment is switched to the closed state.

[0056] Fig.24 This is an explanatory diagram for explaining the relative sliding direction of the second case 12 with respect to the first case 11.

[0057] Fig.25 This is another explanatory diagram for explaining the relative sliding direction of the second case 12 with respect to the first case 11.

[0058] Fig.26 These are explanatory diagrams for explaining the positional relationship between the first core member 21 and the second core member 22 and the first shield member 41 and the second shield member 42 of the clamp sensor 3 when transitioning from the closed state to the open state and from the open state to the closed state.

[0059] Fig. 27 It is an external perspective view of a single body of a magnetic core 20 in a closed state according to another embodiment.

[0060] Fig.28 It is a side view of a clamp sensor 3B according to another embodiment in a closed state.

[0061] Fig.29 The left figure is a front view of a magnetic core 20C monomer of a clamp sensor 3C according to another embodiment. Fig.29 The right figure is a front view of the magnetic core 20D of the clamp sensor 3D. DETAILED DESCRIPTION

[0062] Hereinafter, embodiments of a clamp sensor and a measuring device will be described with reference to the drawings.

[0063] Figure 1The measuring device 1 shown is an example of a "measuring device", and is configured to include a main body 2 and a clamp sensor 3. In the main body 2, a "measuring unit (measuring circuit)" and the like that measure the measured quantity of the measuring target wire X as an example of the "detection target conductor" based on the detection quantity obtained by the clamp sensor 3 are accommodated in a housing, and an operation unit having various operation switches, a display unit that displays the measured value, etc. are provided (none of which are shown in the figure). The clamp sensor 3 is connected to the main body 2 via a cable 4.

[0064] On the other hand, the clamp sensor 3 is an example of a "clamp sensor", such as Figure 2 to Figure 6 As shown, the magnetic device includes a case 10 , a magnetic core 20 , a magnetic detection element 30 , a shield 40 , a winding 50 , and the like.

[0065] The housing 10 includes a first box 11 and a second box 12, and is configured to accommodate the magnetic core 20, the magnetic detection element 30, the shield 40, the winding 50, etc. The first box 11 is an example of a "first box". Figure 2 , Figure 3 As shown in FIG. 1 , the receiving portion 11a and the holding portion 11b are arranged in parallel along the directions of arrows A and B. Figure 4 , Figure 5 As shown, the accommodating portion 11a is provided with a notch 11s through which the conductor X to be measured can be inserted, and is configured to accommodate a first core member 21 described later in the magnetic core 20, a magnetic detection element 30, a first shield member 41 described later in the shield 40, and a winding 50, etc.

[0066] The second box 12 is an example of a "second box". Figure 2 , Figure 3 As shown, the second box 12 is provided with an operating knob 13 for sliding relative to the first box 11 in the direction of arrows A and B, and is configured to be able to slide relative to the first box 11 in the direction of arrows A and B (sliding along the "virtual straight line" described later). Figure 4 , Figure 6 As shown, the accommodation portion 12 a is configured to accommodate a second core member 22 described later in the magnetic core 20 , a second shield member 42 described later in the shield 40 , and the like.

[0067] The magnetic core 20 is a closed magnetic circuit component of a comb-teeth joint structure as an example of a "magnetic core configured in a ring shape in a closed state". Figure 4 , Figure 7 to Figure 9 , Figure 12 to Figure 15 As shown in FIG. 1 , the first core member 21 and the second core member 22 are provided, and are configured to form a closed magnetic circuit in a rectangular annular shape when viewed from the side in a closed state. The first core member 21 is an example of a first core member constituting a part of the magnetic core in the circumferential direction. Figure 4As shown, the first core member 21 is accommodated in the accommodation portion 11a of the first box 11 in such a manner that a gap G is formed in the center portion in the longitudinal direction thereof. Hereinafter, the member arranged on the distal end side of the two members constituting the first core member 21 is also referred to as the first core member 21a. In addition, the member arranged on the gripping portion 11b side is also referred to as the first core member 21b (an example in which the "first core member" is composed of two members).

[0068] The first core members 21a, 21b are as follows. Fig. 9 As shown, by alternately stacking the plates 25a, 25b, Figure 7 As shown in FIG. 1 , each is formed into a substantially L-shape when viewed from the side. Figure 8 , Fig. 9 As shown, in the clamp sensor 3 of this example, plate 25a is formed to be longer than plate 25b, and the two plates 25a and 25b are stacked in a manner such that the top end of plate 25a protrudes from the top end of plate 25b, thereby forming a "first protrusion protruding along the circumferential direction of the annular magnetic core" by the top end of plate 25a (the portion on the top end P21a, P21b side of plate 25a: hereinafter also referred to as the top end P21a of plate 25a and the top end P21b of plate 25a).

[0069] It should be noted that, in the clamp sensor 3 of this example, the plate 25a of the first core member 21a and the plate 25a of the first core member 21b are made of the same product (same member). In addition, in the clamp sensor 3 of this example, the plate 25b of the first core member 21a and the plate 25b of the first core member 21b are made of the same product (same member). Thus, by making one plate 25a and one plate 25b, both the first core members 21a and 21b can be manufactured.

[0070] In this case, in the clamp sensor 3 of this example, the tip P21a (see Figure 4 , Figure 5 , Figure 7 to Figure 9 , Figure 12 to Figure 15 ) corresponds to "one end of the first core member". In the clamp sensor 3 of this example, the top end P21b of the first core member 21 (see Figure 4 , Figure 5 , Figure 7 to Figure 9 , Figure 12 to Figure 15) is equivalent to "the other end of the first core member". In addition, in the clamp sensor 3 of this example, as an example, the first core members 21a and 21b are formed by four plates 25a and four plates 25b, respectively. That is, in the clamp sensor 3 of this example, four "first protrusions" are provided at the top end P21a of the first core member 21, and four "first protrusions" are provided at the top end P21b of the first core member 21 (an example of a configuration in which a plurality of "first protrusions" as "at least one protrusion" are arranged in the "insertion direction of the detection object conductor relative to the magnetic core"). In this case, in the magnetic core 20 of this example, the first core member 21 is configured so that the top ends P21a and P21b overlap in the relative sliding direction of the second box 12 relative to the first box 11 (the direction of arrows A and B in each figure).

[0071] The second core member 22 is an example of a "second core member formed separately from the first core member and constituting the other portion of the magnetic core in the circumferential direction". Fig. 9 As shown, the plates 26a and 26b are alternately stacked to form a substantially U-shaped shape when viewed from the side. In this case, in the clamp sensor 3 of this example, the plate 26a is formed to be longer than the plate 26b, and the two plates 26a and 26b are stacked in such a manner that the top end of the plate 26a protrudes from the top end of the plate 26b, thereby forming a "second convex portion protruding along the circumferential direction of the annular magnetic core" by the top end of the plate 26a (the portion on the side of the top end P22a and P22b of the plate 26a: hereinafter also referred to as the top end P22a of the plate 26a and the top end P22b of the plate 26a).

[0072] It should be noted that in the clamp sensor 3 of this example, the top end P22a of the second core member 22 (see Figure 4 , Figure 6 to Figure 9 , Figure 12 to Figure 15 ) corresponds to "one end of the second core member". In the clamp sensor 3 of this example, the top end P22b of the second core member 22 (see Figure 4 , Figure 6 to Figure 9 , Figure 12 to Figure 15) is equivalent to "the other end of the second core member". In this case, in the clamp sensor 3 of this example, as an example, the second core member 22 is formed by four plates 26a and four plates 26b. That is, in the clamp sensor 3 of this example, four "second protrusions" are provided at the top end P22a of the second core member 22, and four "second protrusions" are provided at the top end P22b of the second core member 22 (an example of a configuration in which a plurality of "second protrusions" as "at least one protrusion" are arranged in the "insertion direction of the detection object conductor relative to the magnetic core"). In this case, in the magnetic core 20 of this example, the second core member 22 is configured so that the top ends P22a and P22b overlap in the relative sliding direction of the second box 12 relative to the first box 11 (the direction of arrows A and B in each figure).

[0073] In this case, if Fig.24 , Fig.25 As shown, in the clamp sensor 3 of this example, when the magnetic core 20 is transformed into a closed state and configured in a ring state as viewed along the insertion direction of the measuring object conductor X relative to the magnetic core 20, the second box 12 is constructed to be able to slide relative to the first core member 21 as shown by arrows A and B along a "virtual straight line (thick dotted line L2 in the two figures)" that intersects the inner circumferential side edge (the portion of the dotted line L1 in the two figures) of the magnetic core 20 at either of the two circumferential end portions of the first core member 21 (in this example, the top ends P21a and P21b).

[0074] It should be noted that the "intersection angle relative to the inner peripheral side edge of the [virtual straight line] that intersects the inner peripheral side edge of the magnetic core at either of the two circumferential ends of the first core member" is not limited to 90° (orthogonal) in the example of the clamp sensor 3 of this example. However, when a structure is adopted in which a "virtual straight line" is slid along a "crossing angle" that is too small, the "effect achieved by the inventive effect of the present application" to be described later may not be fully achieved. Therefore, if Fig.25 As shown in the figure, the "virtual straight line" represented by the thick dotted lines L2a and L2b is preferably constructed to be able to slide along the "virtual straight line" such that the intersection angle θ1 relative to the "inner peripheral edge of the magnetic core (dashed line L1)" is within the angle range θ2 of at least 45°.

[0075] In addition, in the magnetic core 20 of the clamp sensor 3 of this example, the virtual line L1 as the "inner peripheral side edge of the magnetic core 20" is parallel to the top ends P21a and P21b of the first core member 21. Therefore, the thick virtual line L2 as an example of a "virtual straight line" intersects the virtual line L1 at the same intersection angle on both the top ends P21a and P21b of the first core member 21 (orthogonal in this example). However, unlike the magnetic core 20 of this example, when a "magnetic core" (not shown) is provided in which the "inner peripheral side edge of the magnetic core" is not parallel to "one end and the other end of the first core member", the "second box" can be configured to be able to slide relative to the "first box" along the "virtual straight line" intersecting the "inner peripheral side edge of the magnetic core" at either the "one end of the first core member" or the "other end of the first core member".

[0076] In addition, if Fig.10 , Fig.11 As shown, in the clamp sensor 3 of this example, the thickness of the conductor X to be measured along the "insertion direction (direction of arrow C)" with respect to the clamp sensor 3 is gradually reduced toward the "first direction" side at both ends Pb (an example of "end A") located on the "first direction (direction of arrow B)" side of the second case 12 relative to the first case 11 when the clamp sensor 3 is changed from the closed state to the open state on each "first convex portion (the two ends P21a, P21b of the plate 25a)" of the first core member 21 and ends Pb (an example of "end B") located on the "first direction (direction of arrow B)" side on each "second convex portion (the two ends P22a, P22b of the plate 26a)" of the second core member 22. Specifically, in each "first convex portion" of the first core member 21, the thickness of the central portion in the sliding direction (directions of arrows A and B) is thickness Ta, and the thickness of the end Pb is thickness Tb thinner than thickness Ta. In each “second convex portion” of the second core member 22 , the thickness of the center portion in the sliding direction (directions of arrows A and B) is thickness Ta, and the thickness of the end portion Pb is thickness Tb thinner than thickness Ta.

[0077] In the clamp sensor 3 of this example, the thickness of the conductor X to be measured along the "insertion direction (direction of arrow C)" with respect to the clamp sensor 3 is gradually reduced toward the "second direction" side at both ends Pa (an example of "end C") located on the "second direction (direction of arrow A)" side of each "first convex portion" of the first core member 21, which is the direction of relative sliding of the second case 12 with respect to the first case 11 when the clamp sensor 3 is changed from the open state to the closed state, and ends Pa (an example of "end D") located on the "second direction (direction of arrow A)" side of each "second convex portion" of the second core member 22. Specifically, in each "first convex portion" of the first core member 21, the thickness of the central portion in the sliding direction (directions of arrows A and B) is thickness Ta, and the thickness of the end Pa is thickness Tb thinner than thickness Ta. Specifically, in each "first convex portion" of the first core member 21, the thickness of the center portion in the sliding direction (directions of arrows A and B) is thickness Ta, and the thickness of the end portion Pa is thickness Tb thinner than thickness Ta.

[0078] In addition, if Figure 4 , Figure 7 As shown, in the clamp sensor 3 of this example, the magnetic detection element 30 is accommodated in the accommodation portion 11 a of the first case 11 so as to be arranged in the vicinity of the gap G provided between the first core members 21 a and 21 b .

[0079] On the other hand, Figure 5 , Figure 6 , Fig.12 , Fig.13 As shown in FIG. 1 , the shield 40 includes a first shield member 41 and a second shield member 42. The first shield member 41 is an example of a “first shield member”. Figure 5 , Fig.12 , Fig.13 As shown, the second shielding member 42 is disposed on the outer periphery of the first core member 21 and is accommodated in the accommodation portion 11a of the first case 11 together with the first core member 21. The second shielding member 42 is an example of a "second shielding member". Figure 6 , Fig.12 , Fig.13 As shown, the second core member 22 is housed in the housing portion 12 a of the second case 12 in a state where the second core member 22 is disposed on the outer periphery of the second core member 22 .

[0080] It should be noted that in the clamp sensor 3 of this example, the top end P41a (see Figure 5 , Fig.12 , Fig.13 ) corresponds to "one end of the first shield member". In addition, the top end P41b of the first shield member 41 (see Figure 5 , Fig.12 , Fig.13 ) corresponds to the “other end of the first shield member”. In the clamp sensor 3 of this example, the top end P42a of the second shield member 42 (see Figure 6 , Fig.12 , Fig.13 ) corresponds to "one end of the second shield member". In addition, the top end P42b of the second shield member 42 (see Figure 6 , Fig.12 , Fig.13 ) is equivalent to "the other end of the second shielding member".

[0081] like Figure 4 , Fig.14 As shown, in the clamp sensor 3, when the magnetic core 20 is configured in a ring shape and the magnetic core 20 is turned into a closed state, the "first protrusion (plate 25a)" on the top end P21a side of the first core member 21 and the "second protrusion (plate 26a)" on the top end P22a side of the second core member 22 are arranged in the insertion direction ( Figure 2 , Figure 3 In addition, the clamp sensor 3 is configured so that the "first convex portion (plate 25a)" on the top end P21b side of the first core member 21 and the "second convex portion (plate 26a)" on the top end P22b side of the second core member 22 overlap in the insertion direction of the measuring object conductor X relative to the magnetic core 20 (an example of a configuration in which the "first convex portion" as the "convex portion on the other side" is sandwiched between the "second convex portion" as the "convex portion on at least one side").

[0082] In addition, if Fig.15 As shown, in the clamp sensor 3, the structure is such that when the second box 12 is changed from a closed state to an open state and from an open state to a closed state by relative sliding of the second box 12 relative to the first box 11, the "second protrusion (plate 26a)" on the top end P22a side of the second core member 22 can pass through a position overlapping with the "first protrusion (plate 25a)" on the top end P21b side of the first core member 21 in the insertion direction of the measuring object conductor X relative to the magnetic core 20.

[0083] Specifically, if Figure 8 As shown, in the clamp sensor 3 of this example, along Figure 2 to Figure 7When the magnetic core 20 is observed in the direction of arrows A and B shown, the stacking position of the stacked plate 25a on the first core member 21 (the position of the plate 25a in the insertion direction: the position in the direction of arrow C), that is, the position of the "first convex portion" in the insertion direction, is stacked with the plate 26b on the second core member 22. In addition, in the clamp sensor 3 of this example, the stacking position of the stacked plate 25b on the first core member 21 (the position of the plate 25b in the insertion direction: the position in the direction of arrow C), that is, the position between two adjacent "first convex portions" in the "insertion direction", is stacked with the plate 26a on the second core member 22.

[0084] Furthermore, in the clamp sensor 3 of this example, at the stacking position of the stacked plate 26a on the second core member 22 (the position of the plate 26a in the insertion direction: the position in the direction of the arrow C), that is, at the position of the "second convex portion" in the insertion direction, the plate 25b is stacked on the first core member 21. Furthermore, in the clamp sensor 3 of this example, at the stacking position of the stacked plate 26b on the second core member 22 (the position of the plate 26b in the insertion direction: the position in the direction of the arrow C), that is, at the position between two adjacent "second convex portions" in the "insertion direction", the plate 25a is stacked on the first core member 21.

[0085] In addition, if Fig.12 , Fig.13 , Fig.16 , Fig.17 , Fig.26 As shown, in the clamp sensor 3 of this example, the first shielding member 41 is constructed and accommodated in the accommodating portion 11a of the first box 11 in such a manner that the "first end (top end P41b)" of the first shielding member 41 does not abut against the "second protrusion on the other end side (top end P22b of the plate 26a)" and the "second protrusion on one end side (top end P22a of the plate 26a)" when the second box 12 is changed from a closed state to an open state and when the open state is changed from a closed state to a closed state by relative sliding of the second box 12 relative to the first box 11.

[0086] In addition, in the clamp sensor 3 of the present example, the second shielding member 42 is constructed and accommodated in the accommodating portion 12a of the second box 12 in such a manner that the "second end (top end P42a)" of the second shielding member 42 does not abut against the "first protrusion on one end side (top end P21a of the plate 25a)" and the "first protrusion on the other end side (top end P21b of the plate 25a)" when the second box 12 is changed from a closed state to an open state and from an open state to a closed state by relative sliding of the second box 12 with respect to the first box 11.

[0087] Moreover, if Fig.12 , Fig.17As shown, in the clamp sensor 3 of this example, the first shield member 41 and the second shield member 42 are constructed in such a manner that, when the state is transformed into a closed state and the first core member 21 and the second core member 22 are configured in a ring shape, the top end P41a of the first shield member 41 and the top end P42a of the second shield member 42 are configured in a very close distance, and the top end P41b of the first shield member 41 and the top end P42b of the second shield member 42 are configured in a very close distance.

[0088] Next, an example of a method of using the measurement device 1 will be described with reference to the drawings.

[0089] When measuring the measured quantity of the measuring object conductor X by the measuring device 1, the measuring object conductor X is first clamped by the clamp sensor 3. At this time, as an example, by placing the thumb of the hand holding the grip portion 11b on the operating knob 13 and pulling the operating knob 13 in the direction of the arrow B, the measuring object conductor X is clamped. Figure 3 As shown, the second box 12 is slid relative to the first box 11 in the direction of arrow B (an example of the direction of the thick dotted line L2 which is an example of the above-mentioned "virtual straight line") so that the second box 12 is evaded from above the accommodating portion 11a and is transformed into an open state in which the notch 11s is opened.

[0090] At this time, if Fig.16 , Fig.26 As shown, in the clamp sensor 3 of this example, the second shield member 42 is configured so that the top end P42a of the second shield member 42 does not abut against the "first convex portion (plate 25a)" on the top end P21a side and the "first convex portion (plate 25a)" on the top end P21b side of the first core member 21 when the closed state is changed to the open state. Fig.15 As shown, in the clamp sensor 3 of this example, the structure is such that, when changing from a closed state to an open state, the "second protrusion (plate 26a)" on the top end P22a side of the second core component 22 can pass through a position overlapping with the "first protrusion (plate 25a)" on the top end P21b side of the first core component 21 in the insertion direction of the measuring object conductor X relative to the magnetic core 20 (the direction of the arrow C).

[0091] Therefore, in the clamp sensor 3 of this example, the top end P42a of the second shield member 42 and the top end P22a of the second core member 22 do not get caught with the top ends P21a and P21b of the first core member 21, and the second case 12 can be smoothly slid relative to the first case 11 in the direction of arrow B. In addition, the top ends P42a of the second shield member 42 and the top ends P22a of the second core member 22 can be slid toward the gripping portion 11b more than the top end P21b of the first core member 21, so that the entire notch 11s can be fully opened.

[0092] In this case, as described above, in the clamp sensor 3 of this example, the thickness of the end Pb) located on the "first direction (direction of arrow B)" side of each "second convex portion" of the second core member 22 along the "insertion direction (direction of arrow C)" of the measurement target wire X gradually becomes thinner toward the "first direction" side. Therefore, when the closed state is changed to the open state, even if the first core member 21 and the second core member 22 are slightly offset in the "insertion direction", the end Pb of each "second convex portion" can be smoothly inserted between each "first convex portion", so that each "second convex portion" can smoothly pass against the "first convex portion".

[0093] Specifically, if Fig.18 As shown in the right figure of , when the second box 12 is slid relative to the first box 11 in the direction of arrow B when changing from the closed state to the open state, as an example, the "second protrusion (top end P22a of plate 26a)" which should be present at the position shown by the dotted line relative to the first protrusion (top end P21b of plate 25a)" may be offset in the "insertion direction (direction of arrow C: downward in this figure in this example)" and present at the position shown by the solid line. At this time, in the clamp sensor 3 of this example, the second core member 22 is formed in such a manner that the end Pb of the top end P22a of the plate 26a gradually becomes thinner in the direction of arrow B, and the first core member 21 is formed in such a manner that the end Pa of the top end P21b of the plate 25a gradually becomes thinner in the direction of arrow A which is the opposite direction of arrow B.

[0094] Therefore, when the second box 12 is further moved in the direction of arrow B in a state where the "second convex portion" is offset relative to the "first convex portion" in the manner described above, the top end (right end in the figure) of the end Pb of the "second convex portion" is not easy to abut against the top end (left end in the figure) of the end Pa of the "first convex portion", and each "second convex portion" can be smoothly inserted between each "first convex portion". Therefore, by further moving the second box 12 in the direction of arrow B, as shown in FIG. Fig.19 As shown in the right figure of , after each "first convex part" and each "second convex part" overlap in the direction of arrow C, each "second convex part" moves smoothly in the direction of arrow B relative to each "first convex part". Figure 3 As shown by the single-dot chain line, the conductor wire X to be measured can be reliably and easily inserted into the notch 11s of the first case 11 of the clamp sensor 3 that has been turned into the open state.

[0095] It should be noted that, although the structure is different from the clamp sensor 3 of the present example, when a structure is adopted in which the "first box" is slid relative to the "second box" when changing from a closed state to an open state, the same effect as the clamp sensor 3 of the present example can be achieved by making the thickness of the "end A" located on the "first direction" side in each "first protrusion" of the "first core component" along the "insertion direction" gradually thinner toward the "first direction" side.

[0096] Then, if Figure 2 As shown, the second box 12 is slid relative to the first box 11 in the direction of arrow A (another example of the direction of the thick dotted line L2 as an example of the above-mentioned "virtual straight line") to turn into a closed state. Fig.15 As shown, in the clamp sensor 3 of this example, when the open state is changed to the closed state, the "second protrusion (plate 26a)" on the top end P22a side of the second core member 22 can also pass through the position overlapping with the "first protrusion (plate 25a)" on the top end P21b side of the first core member 21 in the insertion direction of the measurement target conductor X relative to the magnetic core 20. In addition, as Fig.16 , Fig.26 As shown, in the clamp sensor 3 of this example, the second shielding member 42 is constructed in such a manner that the top end P42a of the second shielding member 42 does not abut against the "first protrusion (plate 25a)" on the top end P21b side of the first core member 21 and the "first protrusion (plate 25a)" on the top end P21a side when changing from an open state to a closed state.

[0097] Therefore, in the clamp sensor 3 of this example, the top end P42a of the second shielding member 42 or the top end P22a of the second core member 22 will not get caught with the top ends P21b, P21a of the first core member 21, and the second box 12 can slide smoothly in the direction of arrow A relative to the first box 11.

[0098] In this case, in the clamp sensor 3 of this example, as described above, when the open state is changed to the closed state, the "second convex portion (plate 26a)" on the top end P22a side of the second core member 22 passes between the adjacent "first convex portions (plate 25a)" on the top end P21b side of the first core member 21 and is inserted between the adjacent "first convex portions (plate 25a)" on the top end P21a side. In addition, the "second convex portion (plate 26a)" on the top end P22b side of the second core member 22 is inserted between the adjacent "first convex portions (plate 25a)" on the top end P21b side of the first core member 21. In other words, when changing from an open state to a closed state, the "first protrusion (plate 25a)" on the top end P21b side of the first core member 21 relatively passes through between adjacent "second protrusions (plate 26a)" on the top end P22a side of the second core member 22, and then, the "first protrusion (plate 25a)" on the top end P21a side is relatively inserted between adjacent "second protrusions (plate 26a)" on the top end P22a side, and the "first protrusion (plate 25a)" on the top end P21b side of the first core member 21 is relatively inserted between adjacent "second protrusions (plate 26a)" on the top end P22b side of the second core member 22.

[0099] Therefore, even if foreign matter is attached to the top ends P21a and P21b of the first core member 21, the foreign matter can be pushed away from the top ends P21a and P21b by the plate 26a of the second core member 22, and even if foreign matter is attached to the top ends P22a and P22b of the second core member 22, the foreign matter can be pushed away from the top ends P22a and P22b by the plate 25a of the first core member 21. Thus, a state in which foreign matter is sandwiched between the first core member 21 and the second core member 22 in the closed state can be appropriately avoided.

[0100] In this case, as described above, in the clamp sensor 3 of this example, the thickness of the end portion Pb) located on the "first direction (direction of arrow B)" side in each "first convex portion" of the first core member 21 along the "insertion direction (direction of arrow C)" gradually becomes thinner toward the "first direction" side. In addition, in the clamp sensor 3 of this example, the thickness of the end portion Pa) located on the "second direction (direction of arrow A)" side in each "second convex portion" of the second core member 22 along the "insertion direction (direction of arrow C)" gradually becomes thinner toward the "second direction" side. Therefore, even if the first core member 21 and the second core member 22 are slightly offset in the “insertion direction” when transitioning to the closed state, the end Pa of each “second protrusion” can be smoothly inserted between each “first protrusion” (the end Pb of each “second protrusion” can be smoothly inserted between each “second protrusion”) so that each “first protrusion” and each “second protrusion” can be reliably overlapped in the “insertion direction”.

[0101] Specifically, if Fig.18 As shown in the left figure of , when the second box 12 is slid relative to the first box 11 in the direction of arrow A when changing from the open state to the closed state, as an example, the "second protrusion (top P22a of plate 26a)" which should be present at the position shown by the dotted line relative to the "first protrusion (top P21a, P21b of plate 25a)" sometimes becomes a state where the "insertion direction (direction of arrow C: downward in this figure in this example)" is offset and exists at the position shown by the solid line. At this time, in the clamp sensor 3 of this example, the second core member 22 is formed in a manner that the end Pa of the top P22a of the plate 26a gradually becomes thinner in the direction of arrow A, and the first core member 21 is formed in a manner that the end Pb of the top P21a, P21b of the plate 25a gradually becomes thinner in the direction of arrow B which is the opposite direction of arrow A.

[0102] Therefore, when the second box 12 is further moved in the direction of arrow A while the "second convex portion" is offset relative to the "first convex portion" in the manner described above, the top end of the end Pa of the "second convex portion" (the right end in the figure) is not easy to abut against the top end of the end Pb of the "first convex portion" (the left end in the figure), and each "second convex portion" can be smoothly inserted between each "first convex portion". Therefore, by further moving the second box 12 in the direction of arrow A, as shown in FIG. Fig.19 As shown in the left figure of , each "first protrusion" and each "second protrusion" overlap in the direction of arrow C, and the magnetic core 20 is arranged in a ring shape.

[0103] In this state, if Figure 8 As shown, the side surfaces of each "first protrusion" of the first core member 21 and the side surfaces of each "second protrusion" of the second core member 22 are in surface contact with each other with a sufficiently large area. As a result, the first core member 21 and the second core member 22 are combined with a sufficient magnetic binding force. As a result, the transition of the clamp sensor 3 to the closed state is completed, and an appropriate annular closed magnetic circuit is formed in a manner that surrounds the measured object conductor X.

[0104] Furthermore, in the clamp sensor 3, as described above, the “first convex portion (plate 25a)” on the tip P21a side of the first core member 21 and the “second convex portion (plate 26a)” on the tip P22a side of the second core member 22 overlap in the insertion direction of the measuring object conductor X with respect to the magnetic core 20 when the magnetic core 20 is configured in a ring shape after the magnetic core 20 is configured in a closed state. Furthermore, in the clamp sensor 3, the “first convex portion (plate 25a)” on the tip P21b side of the first core member 21 and the “second convex portion (plate 26a)” on the tip P22b side of the second core member 22 overlap in the insertion direction of the measuring object conductor X with respect to the magnetic core 20.

[0105] Therefore, even if the cable 4 or the measured conductor X is stretched and an external force is applied to the housing 10, resulting in a slight deformation, the top ends P21a and P21b of the first core member 21 are in contact with the "second protrusion (plate 26a)" of the second core member 22, and the top ends P22a and P22b of the second core member 22 are in contact with the "first protrusion (plate 25a)" of the first core member 21 in the closed state. Therefore, a state in which an unexpected gap is generated in the annular closed magnetic circuit (magnetic core 20) is appropriately avoided.

[0106] Moreover, in the clamp sensor 3 of this example, as described above, the first shield member 41 and the second shield member 42 are configured so that when the first core member 21 and the second core member 22 are configured in a ring shape, the top end P42s of the second shield member 42 is arranged close to the top end P41a of the first shield member 41. Therefore, it is possible to appropriately avoid the situation where the surrounding noise component is mixed into the ring-shaped closed magnetic circuit. After that, the measurement of the measured quantity is started by operating the operating part of the main body 2, and the measured quantity about the measured object conductor X is measured based on the detection result obtained by the clamp sensor 3.

[0107] Thus, in the clamp sensor 3, there are: a first core member 21 and a second core member 22, wherein the first core member 21 constitutes a part of the circumference of the magnetic core 20 configured in a ring shape in a closed state, and the second core member 22 is formed separately from the first core member 21 and constitutes the other part of the circumference of the magnetic core 20; and a first box 11 and a second box 22, wherein the first box 11 accommodates the first core member 21, and the second box 33 is configured to be able to slide relative to the first box 11 and accommodate the second core member 22. The clamp sensor 3 is configured such that the "first protrusion (top end of the plate 25a)" protruding along the circumferential direction is provided at the end of at least one of the two ends of the circumferential direction of the first core member 21, and the "second protrusion (top end of the plate 26a)" protruding along the circumferential direction is provided at the end of at least one of the two ends of the circumferential direction of the second core member 22, and when the magnetic core 20 is configured in a ring shape when the state is changed to the closed state, the "first protrusion" and the "second protrusion" overlap in the insertion direction.

[0108] In addition, the measuring device 1 is provided with: the above-mentioned clamp sensor 3; and a main body 2, having a "measuring unit" that measures a predetermined measured quantity based on the detection quantity of the measuring object conductor X inserted into the magnetic core 20 in the insertion direction obtained by the clamp sensor 3.

[0109] Therefore, according to the clamp sensor 3 and the measuring device 1, compared with a clamp sensor having a structure in which both ends of the first core member and both ends of the second core member in the circumferential direction are respectively formed into flat surfaces that run straight in the circumferential direction, and the end faces of the first core member and the end faces of the second core member are in surface contact in the closed state, when viewed along the insertion direction in the closed state, the "first protrusion" provided at at least one of the two ends of the first core member 21 in the circumferential direction and the "second protrusion" provided at at least one of the two ends of the second core member 22 in the circumferential direction (the "first protrusion" side surface and the "second protrusion" side surface) overlap each other, thereby increasing the contact area between the first core member 21 and the second core member 22 in the closed state. Therefore, even if the magnetic core 20 is miniaturized, the first core member 21 and the second core member 22 can be connected with a sufficient magnetic bonding force in the closed state. As a result, the clamp sensor 3 can be further miniaturized, and the conductor wire X to be measured can be reliably and easily clamped even in a narrow space, and the sensitivity of the clamp sensor 3 can be further improved.

[0110] In addition, in the clamp-type sensor 3, the structure is such that the "first protrusion" is respectively provided at the two circumferential end portions of the first core member 21, and the "second protrusion" is respectively provided at the two circumferential end portions of the second core member 22, and when the magnetic core 20 is transformed into a closed state and configured in an annular state, the "first protrusion" on one end side of the first core member 21 and the "second protrusion" on one end side of the second core member 22 overlap in the "insertion direction", and the "first protrusion" on the other end side of the first core member 21 and the "second protrusion" on the other end side of the second core member 22 overlap in the "insertion direction".

[0111] Therefore, according to the clamp sensor 3 and the measuring device 1, the contact area at both ends of the two core members 21 and 22 can be increased compared to the configuration in which the "first convex portion" or the "second convex portion" is provided only on one end side of the first core member 21 and the second core member 22. As a result, the magnetic binding force of the first core member 21 and the second core member 22 in the closed state can be fully improved over the entire circumference of the annular magnetic core 20. As a result, it is possible to appropriately avoid the situation in which a portion with lower detection sensitivity than other portions is generated at any end of the circumferential direction of the magnetic core 20.

[0112] In addition, in the clamp sensor 3, a plurality of protrusions of at least one of the "first protrusion" and the "second protrusion" are arranged in an "insertion direction", and the "protrusion of the other side" is sandwiched between the plurality of "at least one protrusion".

[0113] Therefore, according to the clamp sensor 3 and the measuring device 1, when the second box 12 is relative to the first box 11 along the "virtual straight line ( Fig.24 , Fig.25 When the clamp sensor having a plurality of “first protrusions” arranged in the insertion direction of the measuring object conductor X with respect to the magnetic core 20 is changed from an open state to a closed state by relative sliding of the “thick dotted line L2)” shown in the figure, even if a foreign object is attached in a sandwiched manner between the top ends P21a, P21a or between the top ends P21b, P21b of the first core member 21, the foreign object can be pushed away by the “second protrusion (top end P22a, P22b)” of the second core member 22. In addition, when the clamp sensor having a plurality of “second protrusions” arranged in the insertion direction of the measuring object conductor X with respect to the magnetic core 20 is changed from an open state to a closed state, even if a foreign object is attached in a sandwiched manner between the top ends P22a, P22a or between the top ends P22b, P22b of the second core member 22, the foreign object can be pushed away by the “first protrusion (top end P21 a, P21b)" pushes the foreign matter away. Thus, it is possible to appropriately avoid a state in which a foreign matter is sandwiched between the first core member 21 and the second core member 22 in a closed state. Furthermore, even if an unexpected external force is applied to the first box 11 and the second box 12 in a state in which the conductor X to be measured is clamped, thereby causing a small deformation in the two boxes 11 and 12, the first core member 21 and the second core member 22 can be maintained in a state in which the protruding end of the "first protrusion" abuts against the side of the "second protrusion" and / or the protruding end of the "second protrusion" abuts against the side of the "first protrusion", thereby appropriately avoiding a state in which a gap is generated in the annular closed magnetic circuit. Thus, according to the clamp sensor 3 and the measuring device 1, the detected quantity regarding the conductor X to be measured can be detected with high precision, and as a result, the measured quantity can be measured with high precision.

[0114] In this case, as in the clamp sensor 3 of the measuring device 1 of this example, when the magnetic core 20 is viewed along the insertion direction of the measuring object conductor X relative to the magnetic core 20, which is in a closed state and arranged in a ring shape, the second case 12 can be arranged along the inner peripheral side edge portion ( Fig.24 , Fig.25 The virtual straight line ( Fig.24 , Fig.25The first case 11 is relatively slidable by the second core member 22 (the thick dotted line L2 in FIG. 1 ), thereby enabling the top ends P22a and P22a of the second core member 22 to enter between the top ends P21a and P21a of the first core member 21 from the side when the open state is changed to the closed state. As a result, foreign matter existing between the top ends P21b and P21b can be appropriately pushed away, and the top ends P22b and P22b of the second core member 22 can enter between the top ends P21b and P21b of the first core member 21 from the side, thereby enabling foreign matter existing between the ends P21b and P21b to be appropriately pushed away. Therefore, according to the clamp sensor 3 of this example in which the intersection angle between the virtual straight line and the inner peripheral side edge of the magnetic core 20 is sufficiently large (90° as the angle of the above-mentioned angle range θ2), it is possible to reliably avoid a state in which a gap is generated in the annular closed magnetic circuit, and the detected quantity regarding the measured object conductor X can be detected with high accuracy, and as a result, the measured quantity can be measured with high accuracy.

[0115] In addition, in the clamp sensor 3, the structure is such that when the second box 12 is changed from a closed state to an open state and from an open state to a closed state by relative sliding of the second box 12 with respect to the first box 11, the "second protrusion" on the top end P22a side can pass through a position overlapping with the "first protrusion" on the top end P21b side in the insertion direction.

[0116] Therefore, according to the clamp sensor 3 and the measuring device 1, the clamp sensor 3 can be turned into the open state and restored to the closed state without causing the "second convex portion" on the tip P22a side to abut against the "first convex portion" on the tip P21b side to hinder the relative sliding of the second box 12 with respect to the first box 11. As a result, when the measurement target wire X is inserted into the inner side of the first core member 21, the relative movement of the measurement target wire X to the inner side of the first core member 21 is prevented from being hindered by the second core member 22. In addition, when the measurement target wire X is inserted into the inner side of the second core member 22, the relative movement of the measurement target wire X to the inner side of the second core member 22 is prevented from being hindered by the first core member 21. Therefore, the measurement target wire X can be clamped smoothly.

[0117] In addition, the clamp sensor 3 is provided with: a first shielding member 41, which is arranged on the outer periphery of the first core member 21 and is accommodated in the first box 11 together with the first core member 21; and a second shielding member 42, which is arranged on the outer periphery of the second core member 22 and is accommodated in the second box 12 together with the second core member 22, wherein the first shielding member 41 is arranged such that, when the clamp sensor 3 is changed from the closed state to the open state and from the open state to the closed state, one of the two top ends P41a and P41b in the circumferential direction of the first shielding member 41 is located near the top end P21b of the plate 25a. The first box 11 contains the second shielding member 42, and the second shielding member 42 is contained in the second box 12 in such a manner that the top end P42a of the second shielding member 42 located near the top end P22a of the plate 26a does not abut against the top end P21a of the plate 25a when the clamp sensor 3 is changed from a closed state to an open state and from an open state to a closed state.

[0118] Therefore, according to the clamp sensor 3 and the measuring device 1, the relative sliding of the second core member 22 with respect to the first core member 21 will not be hindered, and the presence of the first shielding member 41 and the second shielding member 42 can appropriately avoid the mixing of noise components into the magnetic core 20 in the closed state.

[0119] In addition, in the clamp sensor 3, the first shielding member 41 is accommodated in the first box 11 in such a manner that the top end P41b does not abut against the top end P22a of the second core member 22 when the clamp sensor 3 is changed from a closed state to an open state and from an open state to a closed state, and the second shielding member 42 is accommodated in the second core member 22 in such a manner that the top end P42a does not abut against the top end P21a of the first core member 21 when the clamp sensor 3 is changed from a closed state to an open state and from an open state to a closed state.

[0120] Therefore, according to the clamp sensor 3 and the measuring device 1, the clamp sensor 3 can be turned into the open state and restored to the closed state without causing the top end P41b of the first shield member 41 to abut against the top end P22a of the second core member 22 or the top end P42a of the second shield member 42 to abut against the top end P21b of the first core member 21 to hinder the relative sliding of the second case 12 with respect to the first case 11. Thus, when the measuring target wire X is inserted into the inner side of the first core member 21, the relative movement of the measuring target wire X to the inner side of the first core member 21 is prevented from being hindered by the second core member 22 and the second shield member 42. In addition, when the measuring target wire X is inserted into the inner side of the second core member 22, the relative movement of the measuring target wire X to the inner side of the second core member 22 is prevented from being hindered by the first core member 21 and the first shield member 41. Therefore, the measuring target wire X can be clamped smoothly.

[0121] In addition, in the clamp sensor 3, the thickness along the "insertion direction" is formed to gradually become thinner at an end Pb in the "first convex portion" located on the side of the "first direction (the direction of arrow B in each figure)" which is the direction of relative sliding of the second box 12 relative to the first box 11 along a virtual straight line when the clamp sensor 3 is changed from a closed state to an open state, an end Pb in the "second convex portion" located on the side of the "first direction", an end Pa in the "first convex portion" located on the side of the "second direction (the direction of arrow A in each portion)" which is the direction of relative sliding of the second box 12 relative to the first box 11 along a virtual straight line when the clamp sensor 3 is changed from an open state to a closed state, and an end Pa in the "second convex portion" located on the side of the "second direction".

[0122] Therefore, according to the clamp sensor 3 and the measuring device 1, when the clamp sensor 3 is changed from a closed state to an open state or from an open state to a closed state, even if the "first protrusion" and the "second protrusion" are slightly offset in the insertion direction, the "first protrusion" and the "second protrusion" are not easy to abut in the sliding direction, so the second box 12 can slide appropriately relative to the first box 11.

[0123] In addition, in the clamp sensor 3, along Figure 2 , Figure 3The first case 11 is configured by arranging the housing portion 11a and the gripping portion 11b for housing the first core member 21 in the direction of arrows A and B, and the housing portion 12a for housing the second core member 22 is configured so as to be relatively slidable relative to the first case 11 in the direction of arrows A and B. Therefore, according to the clamp sensor 3 and the measuring device 1, the clamp sensor 3 formed in a rod shape (straight shape) can be easily clamped even for the measuring object conductor X existing in a narrow place, and the measuring object conductor X can be reliably and easily clamped, compared with a configuration in which the housing portion 11a and the gripping portion 11b are arranged in an L shape when viewed from the side.

[0124] It should be noted that the configurations of the “clamp sensor” and the “measuring device” are not limited to the above-described examples of the configurations of the clamp sensor 3 and the measuring device 1 .

[0125] For example, the following example is described: in order to avoid the second case 12 from above the accommodating portion 11a in the open state and to completely open the notch 11s, the top end P22a (the second convex portion on one end side) of the second core member 22 is configured to pass through a position overlapping with the top end P21b (the first convex portion on the other end side) of the first core member 21 in the insertion direction when the second case 12 slides relative to the first case 11 from the closed state to the open state and from the open state to the closed state. Instead of such a configuration, a configuration may be used in which a portion of the top end side of the case 12 is located above the accommodating portion 11a in the open state, that is, a configuration in which the notch 11s is partially opened.

[0126] Specifically, if Fig. 27 As shown, as an example, the following configuration may be adopted: when the closed state is changed to the open state, the relative sliding of the second case 12 with respect to the first case 11 is stopped at a position where the top end P22a (the second convex portion on one end side) of the second core member 22 and the top end P21b (the first convex portion on the other end side) of the first core member 21 overlap in the insertion direction, that is, the top end P22a (the second convex portion on one end side) of the second core member 22 and the top end P21b (the first convex portion on the other end side) of the first core member 21 overlap in the insertion direction in the closed state. Even when such a configuration is adopted, the notch 11s is opened sufficiently wide, so the detection target conductor can be clamped smoothly.

[0127] In addition, it can also be configured that: when changing from a closed state to an open state, the second box 12 will not slide relative to the first box 11 to a position where the top end P22a of the second core member 22 (the second protrusion on one end side) and the top end P21b of the first core member 21 (the first protrusion on the other end side) overlap in the insertion direction.

[0128] In addition, when adopting a configuration in which a portion of the top end side of the box 12 in the open state is located above the accommodating portion 11a, that is, a state in which the notch 11s is partially open, it can also be configured as follows: when changing from the open state to the closed state, the top end P41b of the first shielding member 41 abuts against the top end P22a (the second protrusion on one end side) of the second core member 22, and when changing from the closed state to the open state and from the open state to the closed state, the top end P42a of the second shielding member 42 abuts against the top end P21b (the first protrusion on the other end side) of the first core member 21.

[0129] In addition, an example is described in which the thickness along the "insertion direction" gradually becomes thinner toward the end at all of the "end A" and "end C" of the "first protrusion" and the "end B" and "end D" of the "second protrusion", but the following structure may also be adopted: by gradually thinning the thickness along the "insertion direction" toward the end at at least one of the "end A" to "end D", the "end" is not easy to abut against other "protrusions".

[0130] In this case, as an example, Fig. 20 As shown in the right figure of , if the first core member 21 is constructed in such a way that the end Pa of the top end P21b of the plate 25a gradually becomes thinner in the direction of arrow A which is the opposite direction of arrow B, then for the end Pb of the top end P22a of the plate 26a, even if the thickness is not gradually thinned, the top end (right end in the figure) of the end Pb of the "second protrusion" is not easy to abut against the top end (left end in the figure) of the end Pa of the "first protrusion". Therefore, each "second protrusion" can be smoothly inserted between each "first protrusion", as shown in FIG. Fig.21 As shown in the right figure of FIG. 1 , each “first convex portion” and each “second convex portion” are overlapped in the direction of arrow C, so that each “second convex portion” can be smoothly moved relative to each “first convex portion” in the direction of arrow B. It should be noted that, although not shown in the figure, if the second core member 22 is formed in such a way that the end Pb of the top end P22b of the plate 26a gradually becomes thinner in the direction of arrow B, then for the end Pa of the top end P21a of the plate 25a, even if the thickness is not gradually thinned, the top end Pb of the “second convex portion” is not easy to abut against the top end Pa of the “first convex portion”.

[0131] In addition, as an example, Fig. 20As shown in the left figure of FIG. 2, if the first core member 21 is formed in such a way that the end Pb of the top P21a and / or the top P21b of the plate 25a gradually becomes thinner in the direction of arrow B which is the opposite direction of arrow A, then for the top P22a and / or the end Pb of the top P22b of the plate 26a, even if the thickness is not gradually thinned, the top end of the end Pa of the "second protrusion" (the left end in the figure) is not easy to abut against the top end of the end Pb of the "first protrusion" (the right end in the figure). Therefore, each "second protrusion" can be smoothly inserted between each "first protrusion", as shown in FIG. Fig.21 As shown in the left figure of , each "second convex portion" can also be smoothly moved in the direction of arrow A to a state where each "first convex portion" overlaps with each "second convex portion" in the direction of arrow C. It should be noted that, although not shown in the figure, if the second core member 22 is formed in a manner that the end Pa of the top end P22a and / or the top end P22b of the plate 26a gradually becomes thinner in the direction of arrow A, then for the end Pb of the top end P21a and / or the top end P21b of the plate 25a, even if the thickness is not gradually thinned, the top end Pb of the "second convex portion" is not easy to abut the top end Pa of the "first convex portion".

[0132] Furthermore, the clamp sensor 3 having the magnetic core 20 is described as an example, wherein the first core member 21 is configured such that the top ends P21a and P21b overlap in the relative sliding direction of the second case 12 with respect to the first case 11, and the second core member 22 is configured such that the top ends P22a and P22b overlap in the sliding direction. Fig.28 As shown in the figure, the magnetic core 20B of the clamp sensor 3B may be configured to include a magnetic core 20B in which a first core member 21B (another example of a "first core member") is configured such that the top ends P21a and P21b do not overlap in the sliding direction, and a second core member 22B (another example of a "second core member") is configured such that the top ends P22a and P22b do not overlap in the sliding direction. It should be noted that the shapes of the top ends P21a, P21b, P22a, and P22b of the two core members 21B and 22B of the magnetic core 20B are the same as those of the two core members 21 and 22 of the magnetic core 20 described above, and therefore a detailed description thereof will be omitted.

[0133] In addition, an example of a magnetic core 20 that can form an annular closed magnetic circuit that is rectangular when viewed from the side in a closed state is described, but the shape of the annular closed magnetic circuit formed by the "magnetic core" in the closed state when viewed from the side can be set to various shapes such as circular, elliptical, and irregular.

[0134] In addition, the configuration of the magnetic core 20 having four "first protrusions" respectively provided at the top ends P21a and P21b of the first core member 21 and four "second protrusions" respectively provided at the top ends P22a and P22b of the second core member 22 is described as an example. However, the number of "first protrusions" provided at one end side and the other end side of the "first core member" and the number of "second protrusions" provided at one end side and the other end side of the "second core member" are not limited thereto. For example, for a configuration in which the number of "first protrusions" is different from the number of "second protrusions", specifically, as an example, the number of "first protrusions" can be set to three and the number of "second protrusions" can be set to two or the number of "first protrusions" can be set to two and the number of "second protrusions" can be set to three. In addition, it is also possible to set the protrusion of either the "first protrusion" or the "second protrusion" to be multiple and the protrusion of the other to be one.

[0135] In addition, the number of "first convex portion" and "second convex portion" may be set to one respectively. Specifically, as an example, Fig.29 Like the magnetic core 20C of the clamp sensor 3C shown in the left figure, a "first protrusion" can be formed at the top end P21C of the first core member 21C (another example of the "first core member"), and a "second protrusion" can be formed at the top end P22C of the second core member 22C (another example of the "second core member").

[0136] In this case, the "first convex portion" and "second convex portion" are not limited to the "rectangular shape when viewed from the front" (a shape having a protruding end surface orthogonal to the annular magnetic circuit when viewed from the front) such as the "first convex portion" (top end P21C) of the first core member 21C and the "second convex portion" (top end P22C) of the second core member 22C described above. Specifically, Fig.29 Like the magnetic core 20D of the clamp sensor 3D shown in the right figure, the top end P21D (another example of the “first protrusion”) of the first core member 21D (another example of the “first core member”) is formed by an inclined surface that obliquely intersects the annular magnetic circuit when viewed from the front, and the top end P22D (another example of the “second protrusion”) of the second core member 22D (another example of the “second core member”) is formed by an inclined surface that obliquely intersects the annular magnetic circuit when viewed from the front.

[0137] In addition, the configuration of the first core member 21 formed by the laminated plates 25a and 25b and the second core member 22 formed by the laminated plates 26a and 26b has been described as an example. Instead of such a configuration, a "first core member" having the same shape as the first core member 21 and a "second core member" having the same shape as the second core member 22 may be formed by mold forming, cutting, etc. to form a "magnetic core". Furthermore, the configuration of the magnetic core 20 having the gap G provided in the first core member 21 has been described as an example, but the "magnetic core" may be formed by providing a gap in the "second core member" instead of the "first core member", or by providing a gap in neither the "first core member" nor the "second core member".

[0138] In addition, the structure of the shielding member 40 of the clamp sensor 3 can be changed to improve the shielding effect in the closed state. Fig. 22 , Fig.23 In the clamp sensor 3A shown in the figure, the first shield member 41a as another example of the “first shield member” is formed in the circumferential direction of the magnetic core 20, and the top end P41a of the first shield member 41a, which is located near the “first protrusion on the other end side (top end P21a of the plate 25a)”, protrudes from the “first protrusion on the other end side” in the circumferential direction, so that the clamp sensor 3 is opened from the open state ( Fig. 22 state shown) into a closed state ( Fig.23 In the state shown in the figure), the top end P42a (the end located near the "second convex portion on the other end side") of the second shield member 42a as another example of the "second shield member" is accommodated in the "first box" in a manner that the top end P42a (the end located near the "second convex portion on the other end side") is in contact with the top end P41a. In addition, in this clamp sensor 3A, the top end P42b of the second shield member 42a located near the "second convex portion on the one end side (top end P22b of the plate 26a)" of the two top ends P42a and P42b of the second shield member 42a formed in the circumferential direction of the magnetic core 20 protrudes from the "second convex portion on the one end side" in the circumferential direction, and when the clamp sensor 3A is changed from the open state to the closed state, the top end P42b of the first shield member 41a is accommodated in the "second box" in a manner that the top end P42b is in contact with the top end P42b.

[0139] By adopting such a structure, the first shielding member 41a and the second shielding member 42a will not abut against the magnetic core 20 (first core member and second core member) and hinder the sliding of the second box relative to the first box 11 when the clamp sensor 3A is converted to an open state or a closed state, and noise can be properly avoided from mixing in from the gap between the two shielding members 41a and 41b in the closed state.

[0140] In this case, in order to further enhance the magnetic binding force of the clamp-type sensor having a structure in which the two circumferential ends of the "first core member" and the two circumferential ends of the "second core member" are respectively formed as flat surfaces straight in the circumferential direction and the end face of the "first core member" is in surface contact with the end face of the "second core member" in a closed state, it is sufficient to make the area in which at least one of the two circumferential ends of the "first core member" and at least one of the two circumferential ends of the "second core member" in a closed state larger than the cross-sectional area of ​​the "first core member" in a direction orthogonal to the circumferential direction and the cross-sectional area of ​​the "second core member" in a direction orthogonal to the circumferential direction.

[0141] Specifically, in the clamp sensor 3 and the like, in order to achieve a state in which the side surface of the "first convex portion" and the side surface of the "second convex portion" are in surface contact with each other with a sufficiently wide area in the closed state, the circumferential length (protruding length) and the radial length (sliding direction) of the "first convex portion" are set to be sufficient lengths to increase the area of ​​the side surface of the "first convex portion" and the side surface of the "second convex portion", thereby increasing the area in which the "first core member" and the "second core member" are in contact with each other. In this way, when adopting a configuration in which the side surface of the "first convex portion" and the side surface of the "second convex portion" are in contact with each other, by further lengthening at least one of the circumferential length (protruding length) and the radial length (sliding direction) of the "first convex portion" and the "second convex portion", the area in which the "first core member" and the "second core member" are in contact with each other can be further increased, thereby further enhancing the magnetic binding force between the "first core member" and the "second core member".

[0142] Furthermore, in addition to the configuration in which the side surfaces of the "first protrusion" and the "second protrusion" are in contact with each other in the closed state, by configuring the protruding end surface of the "first protrusion" to be in contact with the "second core member" or configuring the protruding end surface of the "second protrusion" to be in contact with the "first core member", the area in which the "first core member" and the "second core member" are in contact with each other can be increased only by the amount of these areas, thereby further enhancing the magnetic binding force between the "first core member" and the "second core member".

[0143] In addition, as in the clamp sensor 3 described above, by configuring a configuration in which a plurality of "first convex portions" and "at least one convex portion" of the "second convex portions" are arranged in the "insertion direction", and a state is formed in which a "convex portion of the other side" of the "first convex portion" and the "second convex portion" are sandwiched between the plurality of "at least one convex portions", the two side surfaces of the "convex portion of the other side" are in contact with the side surfaces of the two "at least one convex portions" arranged in an arranged manner, compared with a configuration in which the "first convex portion" and the "second convex portion" are provided one by one. As a result, the area in which the "first core member" and the "second core member" are in contact with each other can be further increased, and the magnetic binding force between the "first core member" and the "second core member" can be further enhanced.

[0144] Moreover, as in the clamp sensor 3 described above, by providing the "first convex portion" at both ends of the "first core member" in the circumferential direction and the "second convex portion" at both ends of the "second core member" in the circumferential direction, compared with the configuration in which the "first convex portion" is provided only at one of the two ends of the "first core member" in the circumferential direction and the "second convex portion" is provided only at one of the two ends of the "second core member" in the circumferential direction, in the closed state, the "first convex portion" at one end of the "first core member" in the circumferential direction and the "second convex portion" at one end of the "second core member" in the circumferential direction contact each other, and the "first convex portion" at the other end of the "first core member" in the circumferential direction and the "second convex portion" at the other end of the "second core member" in the circumferential direction contact each other, thereby sufficiently increasing the area in which the "first core member" and the "second core member" contact each other. As a result, the magnetic binding force between the "first core member" and the "second core member" can be sufficiently enhanced.

[0145] It should be noted that the example in which the "first convex portion" is provided at both ends of the "first core member" in the circumferential direction and the "second convex portion" is provided at both ends of the "second core member" in the circumferential direction is described. Instead of such a configuration, the "first convex portion" may be provided at only one of the two ends of the "first core member" in the circumferential direction, and the "second convex portion" may be provided at only one of the two ends of the "second core member" in the circumferential direction. In this way, even in the configuration in which the "first convex portion" and the "second convex portion" are provided at only one of the two ends, the magnetic coupling force between the "first core member" and the "second core member" at the ends provided with the "first convex portion" and the "second convex portion" can be sufficiently improved.

[0146] Industrial Applicability

[0147] According to the present invention, by making the overlapping parts of the first protrusion and the second protrusion (the side surface of the first protrusion and the side surface of the second protrusion) contact each other when viewed in the insertion direction in the closed state, the contact area between the first core member and the second core member in the closed state can be increased. Thus, even if the magnetic core is miniaturized, a state can be formed in which the first core member and the second core member are combined with a sufficient magnetic binding force in the closed state, so that the clamp sensor can be further miniaturized and the conductor of the detection object can be reliably and easily clamped in a narrow place, and the sensitivity of the clamp sensor can be further improved. Therefore, the present invention can be widely applied to clamp sensors and measuring devices.

[0148] Description of Reference Numerals

[0149] 1: Measurement device;

[0150] 2: Main body;

[0151] 3. 3A~3C: Clamp-on sensor;

[0152] 4: Cable;

[0153] 10: Shell;

[0154] 11: First box;

[0155] 11a, 12a: accommodating portion;

[0156] 11b: grip part;

[0157] 11s: gap;

[0158] 12: The second box;

[0159] 13: Operation knob;

[0160] 20, 20B~20D: magnetic core;

[0161] 21, 21a, 21b, 21B: first core member;

[0162] 22, 22B: second core member;

[0163] 25a, 25b, 26a, 26b: plates;

[0164] 30: magnetic detection element;

[0165] 40: shielding element;

[0166] 41, 41a: first shielding member;

[0167] 42, 42a: second shielding member;

[0168] 50: Winding;

[0169] G: gap;

[0170] L1: dotted line;

[0171] L2, L2a, L2b: thick dashed lines;

[0172] P21a, P21b, P22a, P22b, P41a, P41b, P42a, P42b: apex;

[0173] Pa, Pb: end;

[0174] Ta, Tb: thickness;

[0175] X: Wire to be measured;

[0176] θ1: intersection angle;

[0177] θ2: Angle range.

Claims

1. A clamp-on sensor, comprising: a first core member and a second core member, wherein the first core member constitutes a portion of a magnetic core arranged in a ring shape in a closed state in the circumferential direction, and the second core member is formed separately from the first core member and constitutes the other portion of the magnetic core in the circumferential direction; and a first case and a second case, wherein the first case accommodates the first core member, and the second case is configured to be slidable relative to the first case and accommodates the second core member, The clamp sensor is configured such that, when the magnetic core is viewed in a state where the magnetic core is transformed into the closed state and configured in a ring shape along the insertion direction of the detection object conductor relative to the magnetic core, the second box can slide relative to the first box along a virtual straight line intersecting the inner peripheral side edge of the magnetic core at either side of the two end portions of the circumferential direction of the first core member, A first convex portion protruding along the circumferential direction is provided at at least one of the two end portions of the first core member in the circumferential direction, and a second convex portion protruding along the circumferential direction is provided at at least one of the two end portions of the second core member in the circumferential direction, The clamp sensor is configured such that, when the magnetic core is arranged in a ring shape after the sensor is turned into the closed state, the first protrusion and the second protrusion overlap in the insertion direction.

2. The clamp-on sensor according to claim 1, wherein: The clamp-type sensor is constructed such that, when the first convex portion is respectively provided at the two end portions in the circumferential direction of the first core member, and the second convex portion is respectively provided at the two end portions in the circumferential direction of the second core member, and when the closed state is transformed and the magnetic core is configured in an annular state, the first convex portion on one end side of the first core member overlaps with the second convex portion on one end side of the second core member in the insertion direction, and the first convex portion on the other end side of the first core member overlaps with the second convex portion on the other end side of the second core member in the insertion direction.

3. The clamp-type sensor according to claim 1 or 2, wherein: The clamp sensor is configured such that a plurality of at least one of the first and second protrusions are arranged in the insertion direction, and a protrusion of the other of the first and second protrusions is sandwiched between the plurality of the at least one protrusions.

4. The clamp-type sensor according to claim 2 or 3, wherein: The clamp sensor is configured such that, when the second case slides relative to the first case from the closed state to the open state, the second convex portion on the one end side overlaps with the first convex portion on the other end side in the insertion direction.

5. The clamp-type sensor according to any one of claims 2 to 4, wherein: The clamp sensor is configured so that, when the second box is changed from the closed state to the open state and when the second box is changed from the open state to the closed state by relative sliding of the second box with respect to the first box, the second protrusion on the one end side can pass through a position overlapping with the first protrusion on the other end side in the insertion direction.

6. The clamp-type sensor according to any one of claims 1 to 5, wherein: The clamp sensor includes: a first shield member disposed on an outer peripheral portion of the first core member and housed in the first case together with the first core member; and a second shielding member disposed on the outer periphery of the second core member and housed in the second box together with the second core member, The first shield member is housed in the first case in such a manner that it does not abut against the second core member when the clamp sensor changes from the closed state to the open state and when the clamp sensor changes from the open state to the closed state. The second shield member is housed in the second case so as not to abut against the first core member when the clamp sensor is changed from the closed state to the open state and when the clamp sensor is changed from the open state to the closed state.

7. The clamp-type sensor according to any one of claims 2 to 6, wherein: The clamp sensor includes: a first shield member disposed on an outer peripheral portion of the first core member and housed in the first case together with the first core member; and a second shielding member disposed on the outer periphery of the second core member and housed in the second box together with the second core member, The first shielding member is accommodated in the first box in such a manner that a first end of the two circumferential ends of the first shielding member located near the first protrusion on the other end side does not abut against the second protrusion on the other end side when the clamp sensor changes from the closed state to the open state and from the open state to the closed state, The second shielding member is housed in the second box in such a manner that a second end portion of the second shielding member's two circumferential end portions located near the second protrusion on the one end side does not abut against the first protrusion on the one end side when the clamp sensor is transformed from the closed state to the open state and from the open state to the closed state.

8. The clamp-on sensor according to claim 7, wherein: The first shielding member is accommodated in the first box in such a manner that the first end portion does not abut against the second protrusion on the one end side when the clamp sensor changes from the closed state to the open state and from the open state to the closed state. The second shield member is housed in the second case so that the second end portion does not abut against the first protrusion on the other end side when the clamp sensor changes from the closed state to the open state and from the open state to the closed state.

9. The clamp-type sensor according to any one of claims 1 to 8, wherein: The magnetic core is formed so that at least one of the two ends, namely, end A located on the first direction side in at least one of the first protrusions on one side and end B located on the first direction side in at least one of the second protrusions on one side, has a thickness that gradually becomes thinner along the insertion direction toward the first direction side, wherein the first direction side is the direction in which the second box slides relative to the first box along the virtual straight line when the clamp sensor is changed from the closed state to the open state.

10. The clamp-type sensor according to any one of claims 1 to 9, wherein: The magnetic core is formed so that at least one of the two ends, namely, an end C located on the second direction side in at least one of the first protrusions on one side and an end D located on the second direction side in at least one of the second protrusions on one side, has a thickness that gradually becomes thinner along the insertion direction toward the second direction side, wherein the second direction side is the direction in which the second box slides relative to the first box along the virtual straight line when the clamp sensor is changed from the open state to the closed state.

11. A measuring device comprising: The clamp-on sensor according to any one of claims 1 to 10; and The measuring unit measures a predetermined measured amount based on a detection amount obtained by the clamp sensor with respect to the detection target conductor inserted into the magnetic core in the insertion direction.

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