CN111742230A - Clamp sensor and measuring device - Google Patents

Abstract

Reliably clamp the clamping object. It includes a pair of clamp arms (11a), the pair of clamp arms is formed in a substantially arc shape in plan view, and at least one of the pair of clamp arms is configured to be rotatable so that the respective front ends can be opened and closed with each other , so that an annular body is formed in a state where the front end parts are closed to each other, and each part (51a) on the front end part side of each clamp arm has a pair of opposing surfaces (101) constituting the outer peripheral surface and the inner peripheral surface of the annular body , a pair of opposing surfaces (102) constituting the two sides of the annular body, a pair of opposing surfaces (103) inclined with respect to the opposing surfaces (101, 102), and a pair of opposing surfaces (101, 102) inclined The opposing surfaces (104) are formed such that, among the sides constituting the outer shape of the cut surface (Sc1) orthogonal to the longitudinal direction of the respective gripping arms, the respective locations on the front end side of the respective gripping arms are the same as the opposing surfaces (104). The lengths (L2) of the sides (E3, E4) corresponding to 103, 104) are longer than the lengths (L1) of the sides (E1, E2) corresponding to the opposite faces (101, 102).

Description

Clamp sensor and measuring device

technical field

The invention relates to a clamp-type sensor and a measuring device. The clamp-type sensor measures the detected quantity of the clamped object in a state where the clamped object is clamped by a pair of clamp arms that are approximately arc-shaped in plan view. For detection, the measuring device includes the above-mentioned clamp sensor, and measures the measured quantity of the clamped object.

Background technique

As such a clamp-type sensor, a clamp-type sensor disclosed by the applicant in the following Patent Document 1 is known. The clamp-type sensor includes a movable-side sensor and a fixed-side sensor each formed in a substantially arc shape in plan view. In this case, the movable-side sensor is connected so as to be rotatable about the base end portion by being inserted through the base end portion by the connecting pin. When using this clamp-type sensor to detect, for example, a current flowing through an electric wire, a lever provided at the proximal end of the movable-side sensor is held. At this time, the movable-side sensor is rotated, and the respective front end portions of the respective sensors are separated from each other. Next, the electric wire is passed through the divided portion, and then the grip of the lever is released. At this time, under the action of the urging force of the spring, the respective tip portions of the respective sensors come into contact with each other, and the electric wires are surrounded by the annular bodies constituted by the respective sensors and are clamped. Next, the current flowing in the electric wire is detected by each sensor.

prior art literature

Non-patent literature

Patent Document 1: Japanese Patent Laid-Open No. 2007-17188 (pp. 4-5, FIG. 1 )

SUMMARY OF THE INVENTION

The technical problem to be solved by the invention

However, the above-mentioned clamp-type sensor has the following problems that need to be improved. That is, in such a clamp sensor including the above-described clamp sensor, in order to ensure sufficient sensitivity, each sensor is formed thick, and the cross section of each sensor is formed in a substantially square shape. Therefore, the above-mentioned clamp-type sensor has the following technical problem: when another electric wire is arranged near the electric wire of the detection target or there is an obstacle near the electric wire of the detection target, it is difficult to insert the distal end of each sensor into the detection target It is desirable to improve the gap between one electric wire and another electric wire or an obstacle, so that the electric wire of the detection object cannot be clamped by each sensor.

The present invention has been made in view of the above-mentioned technical problems to be improved, and its main object is to provide a clamp-type sensor and a measuring device that can reliably clamp a clamping object.

Technical solutions adopted to solve technical problems

In order to achieve the above object, the clamp sensor of the first technical solution includes a pair of clamping arms, the pair of clamping arms are respectively formed in an approximate arc shape when viewed from above, and at least one of the pair of clamping arms is It is configured such that the front end portions of the pair of clamp arms can be turned to open and close each other, so that when the front end portions of the pair of clamp arms are closed to each other, the pair of clamp arms forms an annular body, and the clamp The type sensor is configured to be able to detect the detected amount of the clamping object in a state where the clamping object is clamped by each of the clamping arms, wherein,

Each portion on the front end portion side of each of the clamp arms has a pair of first opposing surfaces, a pair of second opposing surfaces, and a plurality of pairs of third opposing surfaces, the pair of first opposing surfaces constituting the ring The outer peripheral surface and the inner peripheral surface of the annular body, the pair of second opposing surfaces constitute two side surfaces of the annular body, and the plurality of pairs of third opposing surfaces are opposite to the first opposing surfaces and the second opposing surfaces. The opposing surfaces are inclined, and each portion on the front end portion side of each of the clamp arms is formed so that the sides constituting the outer shape of the cross-section plane perpendicular to the longitudinal direction of each of the clamp arms are aligned with each other. The length ratio of the length of the line segment connecting the two ends of at least one of the sides corresponding to the third opposing surfaces and the lengths of the respective sides corresponding to the first opposing surfaces and the second opposing surfaces. The shortest length is long.

In addition, in the clamp sensor according to claim 1, in the clamp sensor according to claim 2, each part on the side of the front end portion of each of the clamp arms is formed so as to be compatible with each of the The lengths of all the line segments connecting the two ends of the respective sides corresponding to the third opposing surfaces are longer than the shortest length among the lengths of the respective sides corresponding to the first opposing surfaces and the second opposing surfaces respectively .

In addition, the clamp sensor of claim 3 includes a pair of clamp arms, the pair of clamp arms are respectively formed in a substantially arc shape when viewed from above, and at least one of the pair of clamp arms is configured as The front end portions of the pair of clamp arms can be rotated to open and close each other, so that the pair of clamp arms forms an annular body in a state in which the front end portions are closed to each other, and the clamp sensor is composed of In order to be able to detect the detected amount of the clamping object in a state where the clamping object is clamped by each of the clamping arms, wherein,

Each portion on the front end portion side of each of the clamp arms has a pair of first opposing surfaces, a pair of second opposing surfaces, and a plurality of pairs of third opposing surfaces, the pair of first opposing surfaces constituting the ring The outer peripheral surface and the inner peripheral surface of the annular body, the pair of second opposing surfaces constitute two side surfaces of the annular body, and the plurality of pairs of third opposing surfaces are opposite to the first opposing surfaces and the second opposing surfaces. The opposing surfaces are inclined, and each portion on the front end portion side of each of the clamp arms is formed so that the sides constituting the outer shape of the cross-section plane perpendicular to the longitudinal direction of each of the clamp arms are aligned with each other. The relative distance between the line segment connecting the two ends of one of the sides corresponding to the third opposing surface and facing each other and the line segment connecting the two ends of the other side of the respective sides is within the following range: greater than (100/√2) of the relative distance of each side corresponding to each of the first opposite surfaces and the relative distance of each side corresponding to each of the second opposite surfaces among the sides (100/√2) % and below 110% of this arbitrarily shorter distance.

In addition, in the clamp sensor according to claim 3, in the clamp sensor according to claim 4, each part on the side of the front end portion of each of the clamp arms is formed such that the mutual The relative distances of all combinations of opposite sides are within the following range: greater than the relative distances of the sides corresponding to the first opposite faces and the relative distances of the sides corresponding to the second opposite faces. (100/√2)% of any shorter distance in the relative distance and less than 110% of that any shorter distance.

In addition, the clamp-type sensor of the fifth aspect includes a pair of clamping arms, the pair of clamping arms are respectively formed in a substantially arc shape when viewed from above, and at least one of the pair of clamping arms is configured as The front end portions of the pair of clamp arms can be rotated to open and close each other, so that the pair of clamp arms forms an annular body in a state in which the front end portions are closed to each other, and the clamp sensor is composed of In order to be able to detect the detected amount of the clamping object in a state where the clamping object is clamped by each of the clamping arms, wherein,

Each portion on the front end portion side of each of the clamp arms has a pair of first opposing surfaces, a pair of second opposing surfaces, and a plurality of pairs of third opposing surfaces, the pair of first opposing surfaces constituting the ring The outer peripheral surface and the inner peripheral surface of the annular body, the pair of second opposing surfaces constitute two side surfaces of the annular body, and the plurality of pairs of third opposing surfaces are opposite to the first opposing surfaces and the second opposing surfaces. The opposing surfaces are inclined, and each portion on the front end portion side of each of the clamp arms is formed so that the sides constituting the outer shape of the cross-section plane perpendicular to the longitudinal direction of each of the clamp arms are aligned with each other. The lengths of the line segments connecting the two ends of at least one of the sides corresponding to the third opposing surfaces are within the following range: The length of each side is 57% or more of the shortest length and less than 1000% of the shortest length.

In addition, in the clamp sensor according to claim 5, in the clamp sensor according to claim 6, each part on the side of the front end portion of each of the clamp arms is formed such that the The lengths of all the line segments connecting the respective two ends of the respective sides corresponding to the third opposing surfaces are within the following range: More than 57% of the shortest length among the lengths, and less than 1000% of the shortest length.

In addition, the clamp-type sensor of the seventh aspect includes a pair of clamping arms, the pair of clamping arms are respectively formed in an approximately arc shape when viewed from above, and at least one of the pair of clamping arms is configured as The front end portions of the pair of clamp arms can be rotated to open and close each other, so that the pair of clamp arms forms an annular body in a state in which the front end portions are closed to each other, and the clamp sensor is composed of In order to be able to detect the detected amount of the clamping object in a state where the clamping object is clamped by each of the clamping arms, wherein,

Each portion on the front end portion side of each of the clamp arms has a pair of first opposing surfaces and a pair of second opposing surfaces, the pair of first opposing surfaces constituting the outer peripheral surface and the inner surface of the annular body The peripheral surface, the pair of second opposing surfaces constitute the two side surfaces of the annular body, and each portion on the front end portion side of each of the clamp arms is formed so as to form the Among the sides of the outer shape of the cross-section planes perpendicular to the longitudinal direction, each side corresponding to each of the first opposing surfaces is formed as a straight line, and each side corresponding to each of the second opposing surfaces is formed to be outward. curved curve.

In addition, in the clamp sensor according to claim 7, in the clamp sensor according to claim 8, each part on the side of the front end portion of each of the clamp arms is formed so as to be compatible with each of the first The longest relative length of each side corresponding to the two opposing surfaces along the direction perpendicular to the opening surface of the annular body is equal to or less than the relative distance of each side corresponding to each of the first opposing surfaces.

In addition, the clamp sensor of claim 9 includes a pair of clamp arms, the pair of clamp arms are respectively formed in a substantially arc shape when viewed from above, and at least one of the pair of clamp arms is configured as The front end portions of the pair of clamp arms can be rotated to open and close each other, so that the pair of clamp arms forms an annular body in a state in which the front end portions are closed to each other, and the clamp sensor is composed of In order to be able to detect the detected amount of the clamping object in a state where the clamping object is clamped by each of the clamping arms, wherein,

Each portion on the front end portion side of each of the clamp arms has a pair of first opposing surfaces, a pair of second opposing surfaces, and two pairs of fourth opposing surfaces, the pair of first opposing surfaces constituting the ring The outer peripheral surface and the inner peripheral surface of the annular body, the pair of second opposing surfaces constitute two side surfaces of the annular body, and the two pairs of fourth opposing surfaces are located on each of the first opposing surfaces and the second opposing surfaces. Between the opposing surfaces, each portion on the front end portion side of each of the clamp arms is formed such that, among the sides constituting the outer shape of the cross-section plane perpendicular to the longitudinal direction of each of the clamp arms, it is the same as each other. Each side corresponding to each of the first facing surfaces and each side corresponding to each of the second facing surfaces are formed as straight lines, and each side corresponding to each of the fourth facing surfaces is formed to be curved outward. curve.

In addition, in the clamp sensor according to claim 9, in the clamp sensor according to claim 10, each part on the side of the front end portion of each of the clamp arms is formed so as to be compatible with each of the first The relative distance between the sides corresponding to the two opposing surfaces is less than or equal to the relative distance between the sides corresponding to the first opposing surfaces.

In addition, on the basis of the clamp-type sensor according to any one of technical solutions 1 to 10, in the clamp-type sensor of technical solution 11, each of the clamping arms respectively includes a Sensor housings are formed such that the thickness of each portion corresponding to the front end portion side of each of the clamp arms is uniform or substantially uniform when viewed from the cut surface.

In addition, based on the clamp sensor according to any one of technical solutions 1 to 11, in the clamp sensor according to technical solution 12, each of the clamping arms is formed as: a base of each of the clamping arms The area of the cut surface of each site on the end side is larger than the area of the cut surface of each site on the front end side.

In addition, based on the clamp sensor according to the twelfth technical solution, in the clamp sensor according to the thirteenth solution, each of the clamping arms includes a magnetic field generated by a current flowing in the clamping object, respectively. the core body, and each of the clamping arms is formed so as to pass through the top of the annular body corresponding to each of the front end portions and formed by each of the core bodies in the formed state of the annular body The straight line of the centroid of the graph of the ring-shaped magnetic circuit in plan view shall pass through the centroid as the center and within the range of the length corresponding to 40% of the straight line distance from the top to the centroid. A plane that points and is perpendicular to the straight line is defined as a boundary surface, and the area ratio of the outer shape of the cut surface at a portion located between the boundary surface and the front end portion of each site on the side of the front end portion is defined as The area of the outer shape of the cross section of each site on the side of the base end portion at the site between the boundary surface and the base end portion is small.

In addition, in the clamp sensor according to claim 12, in the clamp sensor according to claim 14, each of the clamp arms is formed so as to pass through the corresponding portion of the front end portion. The top of the annular body and the line from the centroid of the figure when viewed from above on the inner circumference of the annular body will pass through the centroid with the centroid as the center and corresponding to the straight-line distance from the top to the centroid. Any point within the range of 40% of the length and a plane perpendicular to the straight line is set as a boundary surface, and is used as all the parts located between the boundary surface and the front end part of each part on the side of the front end part. The area of the outer shape of the cut surface is smaller than the area of the outer shape of the cut surface at each site on the base end portion side located between the boundary surface and the base end portion.

In addition, in the clamp sensor according to any one of claims 1 to 14, in the clamp sensor according to claim 15, each of the clamping arms is formed such that a Each of the first opposing surfaces of the outer peripheral surface of each of the front end portions is configured as a plane orthogonal to a direction connecting the front end portion and the base end portion of the annular body in the state where the annular body is formed , the relative distance of each of the first opposing surfaces of each of the front end portions of each of the clamping arms is greater than the relative distance of each of the first opposing surfaces of the respective clamping arms except for the front end portions of each of the clamping arms. The relative distance between the faces is short.

In addition, on the basis of the clamp-type sensor according to any one of technical solutions 1 to 15, in the clamp-type sensor according to technical solution 16, each of the clamping arms is formed such that: along a line perpendicular to the line and the length along the straight line between the position parallel to the direction of the opening surface of the annular body and separated from the center of the top by 15 mm and the outer peripheral surface of the annular body is 9 mm or more and 11 mm or less. within the range.

In addition, on the basis of the clamp sensor according to any one of technical solutions 1 to 16, in the clamp sensor according to technical solution 17, each of the clamping arms is formed such that the boundary surface and the front end The longest distance among the straight-line distances between any two points in the outer shape of the cut surface at the part between one side of the section is within the range of 1/6 or more and 1/5 or less of the separation distance, and the separation The distance is the separation distance between the front end portions of the clamp arms in a state where the front end portions of the clamp arms are most separated from each other.

Further, the measurement device according to claim 18 includes: the clamp sensor according to any one of claims 1 to 17; The detected amount is used to measure the measured amount of the clamping object.

Invention effect

In the clamp sensor according to claim 1 and the measuring device according to claim 18, each portion on the front end portion side of each clamp arm is formed such that each side constituting the outer shape of the sectional plane aligns with each of the first The length of the line segment connecting both ends of at least one of the sides corresponding to the three-phase opposing surfaces is longer than the shortest length among the lengths of the sides corresponding to the first and second opposing surfaces. Therefore, in the clamp sensor and the measuring device, the relative distances of the sides corresponding to the third opposing surfaces can be compared with the relative distances of the sides corresponding to the first opposing surfaces and the second opposing surfaces. The relative distances of the corresponding sides are short. As a result, according to the clamp sensor and the measuring device, the outer shape of the cut surface of each portion on the front end portion side of each clamp arm is quadrangular, and the diagonal distance ratio of the cut surface corresponds to each of the first opposing surfaces, respectively. Compared with the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered), the relative distance between the sides and the relative distance between the sides corresponding to the second opposing faces are long. The tip of each clamp arm is easily inserted into a narrow gap with the measuring device tilted. Therefore, according to the clamp-type sensor and the measuring device, for example, even when other conductors or obstacles exist in the vicinity of the conductor to be clamped, the conductor to be clamped can be reliably clamped.

In addition, according to the clamp sensor according to claim 2 and the measuring device according to claim 18, the length ratio of all the line segments connecting the respective two ends of the respective sides corresponding to the respective third opposing surfaces to Each portion on the front end portion side of each clamp arm is formed so that the shortest length among the lengths of the respective sides corresponding to each of the first opposing surfaces and the respective second opposing surfaces is longer. The relative distances of the corresponding sides are all shorter than the relative distances of the sides corresponding to the first opposing surfaces and the relative distances corresponding to the second opposing surfaces respectively. Therefore, for example, in a state where the measuring device is tilted so as to rotate the measuring device in any one of the right-handed and left-handed rotation directions with the longitudinal direction of the measuring device as an axis, each of the clamping arms can be tilted. The front end is easily inserted into the narrow gap.

In addition, in the clamp sensor according to claim 3 and the measuring device according to claim 18, among the sides constituting the outer shape of the cut surface, one of the sides corresponding to the third facing surfaces is The relative distance between the line segment connecting the two ends and the line segment connecting the two ends of the other side of each side is within the following range: greater than the relative distance of each side corresponding to each first opposite surface among the sides and the same as (100/√2)% of any short distance among the relative distances of each side corresponding to each second opposite surface, and is less than 110% of the arbitrary short distance. Therefore, in this clamp-type sensor and measuring device, the relative distance corresponding to each third facing surface can be made sufficiently shorter than the outer shape of the cross-sectional surface at each position on the distal end portion side of each clamp arm having a quadrangular shape The diagonal distance of the cut plane in the conventional structure formed by the method (the structure in which the corners of the quadrangular prism are not chamfered). As a result, according to the clamp-type sensor and the measurement device, the tip portions of the clamp arms can be easily inserted into a narrow gap with the measurement device inclined compared to the conventional configuration. Therefore, according to the clamp-type sensor and the measuring device, for example, even when other conductors or obstacles exist in the vicinity of the conductor to be clamped, the conductor to be clamped can be reliably clamped.

In addition, according to the clamp sensor according to claim 4 and the measuring device according to claim 18, each part on the front end portion side of each clamp arm is formed so that the relative distance of all combinations of the sides facing each other is located below Within the above range: greater than (100/√2)% of any shorter distance between the relative distances of the sides corresponding to the first opposite faces and the relative distances of the sides corresponding to the second opposite faces, and within By 110% or less of the arbitrary short distance, all the relative distances corresponding to the third facing surfaces can be made sufficiently shorter than the diagonal distance of the cut surface in the conventional structure. Therefore, according to the clamp-type sensor and the measuring device, for example, in a state where the measuring device is tilted so as to rotate the measuring device in any one of the right-handed and left-handed rotation directions with the longitudinal direction of the measuring device as an axis, It is also possible to easily insert each front end portion of each clamp arm into a narrow gap.

In addition, according to the clamp sensor according to claim 5 and the measuring device according to claim 18, among the sides constituting the outer shape of the cut surface, at least two of the sides corresponding to the third facing surfaces, respectively, are at least two of the sides. The length of the line segment connecting the ends is formed in the range of 57% or more and less than 1000% of the shortest length of each side corresponding to each of the first opposing surfaces and each of the second opposing surfaces, respectively. Therefore, according to the clamp-type sensor and the measuring device, the relative distance between the sides corresponding to the third facing surfaces can be sufficiently shorter than the outer shape of the cut surface at each location on the distal end side of each clamp arm. The diagonal distance of the cut surface in the conventional structure (the structure which did not chamfer each corner part of the quadrangular prism) formed in a quadrangular shape. As a result, according to the clamp-type sensor and the measurement device, the tip portions of the clamp arms can be easily inserted into a narrow gap with the measurement device inclined compared to the conventional configuration. Therefore, according to the clamp-type sensor and the measuring device, for example, even when other conductors or obstacles exist in the vicinity of the conductor to be clamped, the conductor to be clamped can be reliably clamped.

In addition, according to the clamp sensor according to claim 6 and the measuring device according to claim 18, each part on the front end portion side of each clamp arm is formed so that each side corresponding to each third facing surface is formed. The lengths of all the line segments connecting the two ends are within the range of not less than 57% and less than 1000% of the shortest length among the lengths corresponding to the respective first and second opposing surfaces. All relative distances of the sides corresponding to the respective third opposite faces are substantially shorter than the diagonal distances of the cut faces in the existing structure. Therefore, according to the clamp-type sensor and the measuring device, for example, in a state where the measuring device is tilted so as to rotate the measuring device in any one of the right-handed and left-handed rotation directions with the longitudinal direction of the measuring device as an axis, It is also possible to easily insert each front end portion of each clamp arm into a narrow gap.

In addition, according to the clamp sensor according to claim 7 and the measuring device according to claim 18, each side corresponding to each first facing surface among the sides constituting the outer shape of the cut surface is formed as a straight line and is in line with each side. Each of the sides corresponding to the second opposing surfaces is formed in a curved line curved outward to form each portion on the front end portion side of each clamp arm. Therefore, the longest side of the respective sides corresponding to the second opposing surfaces can be The relative distance is set to be less than the relative distance of each side corresponding to each first facing surface. Therefore, the outer shape of the cross-sectional surface of each front end side portion of the clamp arm is quadrilateral and the diagonal distance of the cross-sectional surface is compared with the The conventional structure formed in such a way that the relative distance of each side corresponding to each first opposing surface and the longest relative distance of each side corresponding to each second opposing surface are long (the corners of the quadrangular prism are not inverted). The tip end portion of the clamp arm can be easily inserted into a narrower gap compared to the angle structure) in a state where the measuring device is tilted. Therefore, according to the clamp-type sensor and the measuring device, even when other conductors or obstacles exist in the vicinity of the conductor to be clamped, the conductor to be clamped can be reliably clamped.

In addition, in the clamp sensor according to claim 8 and the measurement device according to claim 18, each part on the side of the front end portion of each clamp arm is formed so as to be on each side corresponding to each second opposing surface. The longest relative distance along the direction perpendicular to the opening surface of the annular body is equal to or less than the relative distance of each side corresponding to each first facing surface. Therefore, according to the clamp-type sensor and the measuring device, by inclining the measuring device so that the inclination angle of the opening surface of the annular body with respect to the extending direction of the conductor to be clamped becomes smaller, the distal end portion of the clamp arm can be more inclined. Easily inserted into narrow gaps.

In addition, according to the clamp sensor according to claim 9 and the measuring device according to claim 18, among the sides constituting the outer shape of the cut surface, each side corresponding to each first facing surface and each second facing surface Each side corresponding to the surface is formed as a straight line, and each side corresponding to each of the fourth opposing surfaces is formed as a curve curved outwardly to form each part on the front end portion side of each clamp arm. The longest relative distance of each side corresponding to each of the opposing fourth facing surfaces is set to be equal to or less than the relative distance of each side corresponding to each of the first facing surfaces. The outer shape of the cut surface is formed in a quadrangle, and the diagonal distance of the cut surface is longer than the relative distance of each side corresponding to each first opposing surface and the relative distance of each side corresponding to each second opposing surface. Compared with the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered), the distal end of the clamp arm can be easily inserted into a narrower gap while the measuring device is tilted. Therefore, according to the clamp-type sensor and the measuring device, even when other conductors or obstacles exist in the vicinity of the conductor to be clamped, the conductor to be clamped can be reliably clamped.

In addition, in the clamp sensor according to claim 10 and the measuring device according to claim 18, each portion on the front end portion side of each clamp arm is formed as a side corresponding to each second opposing surface. The relative distance is equal to or less than the relative distance of each side corresponding to each first opposing surface. Therefore, according to the clamp-type sensor and the measuring device, by inclining the measuring device so that the inclination angle of the opening surface of the annular body with respect to the extending direction of the conductor to be clamped becomes smaller, the distal end portion of the clamp arm can be more inclined. Easily inserted into narrow gaps.

In addition, in the clamp sensor according to claim 11 and the measurement device according to claim 18, the sensor housing constituting the housing of each grip arm corresponds to the front end portion side of each grip arm Each of the clamping arms is formed in such a manner that the thickness of each part is uniform or substantially uniform when viewed at the cutting plane. Therefore, according to the clamp-type sensor and the measuring device, compared with a structure in which the thickness of each sensor case is not uniform, the stress concentration in the thin portion of each sensor case can be avoided, the strength of each sensor can be improved, and further, the strength of each sensor can be improved. It is possible to prevent breakage of each sensor case when a load is applied to each sensor case.

Further, according to the clamp sensor according to claim 12 and the measurement device according to claim 18, the area of the cut surface of each part on the base end side of each clamp arm is larger than that on the front end part side of each clamp arm. By forming each clamp arm so that the area of the cut surface of each part is equal to the area of the cut surface of each part on the distal end side, each clamp is formed so that the area of the cut surface of each part on the distal end side is the same as the area of the cut surface of each part on the base end part side. Compared with the structure of the clamp arm, the strength of each clamp arm can be sufficiently improved.

In addition, in the clamp sensor according to claim 13 and the measurement device according to claim 18, the area between the boundary surface and the base is an area ratio of the outer shape of the cut surface at the portion located between the boundary surface and the front end. Each clamp arm is formed so that the area of the outer shape of the cut surface at the portion between the ends is small, wherein on the straight line passing through the top of the annular body and the center of the graph of the magnetic circuit when viewed from above, so The boundary plane passes through a point within a range of a length corresponding to 40% of the straight line distance from the top to the centroid with the centroid as the center, and the boundary plane is orthogonal to the straight line. In this case, when a surface passing through a range exceeding the length corresponding to 40% and a point close to the top is defined as a boundary surface, the length of the portion on the side of the tip portion having a smaller area (that is, thinner) is longer than that of the boundary surface. Short, when clamping one of a plurality of clamping objects arranged side by side at a narrow interval, it is difficult to insert each front end of each clamping arm into the gap between adjacent clamping objects. Inside the narrower gap. On the other hand, when the surface passing through the range exceeding the length corresponding to 40% and the point near the base end is defined as the boundary surface, the length of the portion on the base end side with the larger area (that is, the thicker) Shorter, the strength of each clamping arm decreases. On the other hand, in the clamp sensor and the measuring device, since the surface passing through the point within the range corresponding to 40% of the length is defined as the boundary surface, it is possible to reduce the force of each clamp arm without lowering the surface. In the case of high strength, each front end portion of each clamp arm can be easily inserted into the back side of the narrow gap between adjacent clamp objects. Therefore, according to the clamp-type sensor and the measuring device, the clamping object can be clamped reliably.

In addition, in the clamp sensor according to claim 14 and the measurement device according to claim 18, the boundary surface and the base end are located at the boundary surface and the base end with an area ratio of the outer shape of the cut surface at the portion between the boundary surface and the distal end portion. Each clamp arm is formed so that the area of the outer shape of the cut surface at the portion between the parts is small, wherein a straight line passing through the top of the annular body and the inner circumference of the annular body in a plan view of the center of the figure , the boundary surface passes through a point within a range centered on the centroid and within a range corresponding to 40% of the length of the straight line distance from the top to the centroid, and the boundary surface is orthogonal to the straight line. In this case, when a surface passing through a range exceeding the length corresponding to 40% and a point close to the top is defined as a boundary surface, the length of the portion on the side of the tip portion having a smaller area (that is, thinner) is longer than that of the boundary surface. Short, when clamping one of a plurality of clamping objects arranged side by side at a narrow interval, it is difficult to insert each front end of each clamping arm into the gap between adjacent clamping objects. Inside the narrower gap. On the other hand, when a surface passing through a range exceeding the length corresponding to 40% and a point close to the base end portion is defined as a boundary surface, the length of the portion on the base end portion side having a larger area (that is, thicker) Shorter, the strength of each clamping arm decreases. On the other hand, in the clamp sensor and the measuring device, since the surface passing through the point within the range corresponding to 40% of the length is defined as the boundary surface, it is possible to reduce the force of each clamp arm without lowering the surface. In the case of high strength, each front end portion of each clamp arm can be easily inserted into the back side of the narrow gap between adjacent clamp objects. Therefore, according to the clamp-type sensor and the measuring device, the clamping object can be clamped reliably.

Further, in the clamp sensor according to claim 15 and the measurement device according to claim 18, each clamp arm is formed such that each of the outer peripheral surfaces of the annular body constituting the tip portion of each clamp arm The first opposing surface is formed as a plane orthogonal to the direction connecting the distal end portion and the proximal end portion of the annular body in the shape of the annular body, and the relative distance of each first opposing surface at each distal end portion is greater than that of each clip. The relative distances of the respective first opposing surfaces at the positions other than the respective front end portions of the tightening arm are short. Therefore, according to the clamp sensor and the measuring device, it is possible to more easily insert the tip portions of the clamp arms into the narrow gap. In addition, since the relative distances of the respective first opposing surfaces at the respective front end portions are short, for example, even when there is an obstacle such as a wall behind the clamping object and the gap between the clamping object and the obstacle is narrow, It is also possible to prevent obstacles from coming into contact with each of the clamping arms, thereby reliably clamping the clamping object.

In addition, in the clamp sensor according to claim 16 and the measurement device according to claim 18, each of the clamp arms is formed along a line orthogonal to a line passing through the top of the annular body and the centroid and The length along the straight line between the position parallel to the opening surface of the annular body by 15 mm from the center of the top and the outer peripheral surface of the annular body is in the range of 9 mm or more and 11 mm or less. In this case, when each clamp arm is formed so as to have a length greater than 11 mm, the shape of the front end portion of each clamp arm is too slender. For example, when each clamp arm pair is intended to be arranged on a wall surface When a nearby object to be clamped is clamped, each front end portion of each clamp arm may come into contact with the wall surface, which may make clamping difficult. In addition, when each clamp arm is formed so that the above-mentioned length is longer than 11 mm, the top side of the annular body is formed in an abnormally elongated shape, and the detection characteristics of the detected amount may be deteriorated. On the other hand, when each clamp arm is formed so that the above-mentioned length is less than 9 mm, the shape of the front end portion side of each clamp arm is close to an arc shape. When one of the clamping objects is clamped, it is difficult to insert each front end portion into a gap between the one clamping object and another adjacent clamping object, which may make clamping difficult. On the other hand, according to the clamp-type sensor and the measuring device, each of the clamp arms is formed in the range of 9 mm or more and 11 mm or less, so that the detection characteristics of the magnetic field can be maintained well, and the clamping object can be clamped more reliably. tight.

Further, in the clamp sensor according to claim 17 and the measurement device according to claim 18, each of the clamp arms is formed to have any of the outer shapes of the cut surfaces at the portion between the boundary surface and the front end portion side. The longest distance between two points is within the range of 1/6 to 1/5 of the separation distance, which is the separation between the front ends of the clamp arms in a state where the front ends of the clamp arms are most separated from each other distance. In this case, when each clamp arm is formed so that the above ratio is greater than 1/5, it is difficult to clamp one of the plurality of clamp objects arranged side by side at a narrow interval. Insert each front end of each clamping arm into a narrow gap between adjacent clamping objects. On the other hand, when each of the clamp arms is formed so that the above-mentioned ratio is less than 1/6, if the lever for opening each clamp arm (to separate the respective front end portions from each other) is pushed to the maximum, the respective front end portions The separation distance in the state where they are most separated from each other is too long. When a plurality of clamping objects are arranged side by side at a narrow interval, it is possible to clamp a plurality of clamping objects. Therefore, it is necessary to adjust the pressing amount of the lever, and the operability may get worse. On the other hand, according to the clamp-type sensor and the measuring device, each clamp arm is formed with a relative distance within a range of 1/6 or more and 1/5 or less of the separation distance, and the lever can be pressed to the maximum extent. Since each front end portion is easily inserted into the narrow gap between the adjacent clamp objects, the operability can be sufficiently improved, and only one of the plurality of clamp objects can be clamped more reliably.

Description of drawings

FIG. 1 is a perspective view of the clamp meter 1 .

FIG. 2 is a configuration diagram showing the configuration of the clamp meter 1 .

FIG. 3 is a perspective view of the clamp meter 1 when the clamp sensor 2 is opened.

FIG. 4 is a front view of the clamp meter 1 .

FIG. 5 is a schematic front view of the clamp meter 1 in a state in which the sensor cases 10a, 10b, a part of the main body case 30, and the like are removed.

FIG. 6 is a cross-sectional view comparing the cross section taken along the line A-A and the cross section taken along the line B-B in FIG. 4 .

FIG. 7 is a cross-sectional view taken along the line A-A in FIG. 4 .

FIG. 8 is an explanatory diagram for explaining the structure of the clamp arms 11a and 11b.

FIG. 9 is a front view of the clamp meter 1 in a state where the clamp arms 11a and 11b are opened.

FIG. 10 is a first explanatory diagram illustrating a method of using the clamp meter 1 .

FIG. 11 is a second explanatory diagram illustrating a method of using the clamp meter 1 .

FIG. 12 is a third explanatory diagram illustrating a method of using the clamp meter 1 .

FIG. 13 is a front view of the clamp meter 1A.

FIG. 14 is a cross-sectional view showing the structure of the clamp sensor 402 .

FIG. 15 is a cross-sectional view showing the structure of the clamp sensor 502 .

FIG. 16 is a cross-sectional view showing the structure of the clamp sensor 602 .

Detailed ways

Hereinafter, embodiments of the clamp sensor and the measurement device will be described with reference to the drawings.

First, the structure of the clamp meter 1 shown in FIG. 1 is demonstrated. The clamp meter 1 is an example of a measuring device, and is configured to be able to measure, in a non-contact (metal non-contact) manner, a current (an example of a measured amount) flowing through a conductor 400 to be clamped as shown in FIG. 10 , for example. to measure. Specifically, as shown in FIGS. 1 to 3 , the clamp meter 1 includes a clamp sensor 2 and a main body 3 .

As shown in FIGS. 1 and 3 , the clamp sensor 2 includes a pair of clamping arms 11a and 11b (hereinafter, also referred to as “clamping arms 11” when no distinction is made). As shown in FIG. In a state in which the tightening arms 11a and 11b clamp (enclose) the conductor 400, a magnetic field, which is a detected quantity generated when a current flows through the conductor 400, is detected in a non-contact manner.

In addition, in this clamp sensor 2, as shown in FIGS. 1 and 3 , the clamp arm 11b (one of the clamp arms 11a and 11b) is configured to be rotatable around the rotation shaft 23 (see FIG. 4 ) The clamp arm 11a is fixed to the main body case 30 of the main body portion 3 in a non-rotating state so that the front end portions 21a and 21b of the clamp arms 11a and 11b are opened and closed (contacted, separated) from each other. In addition, in this clamp-type sensor 2 , the clamp arm 11 b is configured to rotate in accordance with an operation (pressing or releasing) of the lever 30 a provided in the main body case 30 . In addition, in the following description, the state in which the front end portions 21a and 21b of the clamp arms 11a and 11b are closed to each other (the state shown in FIG. 1 ) is also referred to as a “closed state”, and the state in which the front end portions 21a and 21b are opened to each other is also referred to as a “closed state”. The state (the state shown in FIG. 3 and FIG. 9 ) is called an "open state".

Further, as shown in FIG. 4 , the clamp arm 11a includes a sensor case 10a, a core 41 (see FIGS. 5 and 7 ) housed in the sensor case 10a, and a magnetic detection element (as an example) outside the drawing. , is a Hall element). Moreover, as shown in FIG. 4, the clamp arm 11b is comprised including the sensor case 10b and the core 41 accommodated in the sensor case 10b (refer FIG. 5, FIG. 7).

Further, as shown in FIG. 4 , the clamp arms 11a and 11b are each formed in a substantially arc shape in a plan view in the thickness direction (the axial direction of the rotation shaft 23), so as to form a ring in a closed state in which the front end portions 21a and 21b are closed to each other. body 100. In this case, as shown in the same drawing, the annular body 100 is configured so as to pass through each portion on the proximal end portion 22a and 22b side of the clamp arms 11a and 11b (hereinafter also referred to as "the proximal end portion side portion 52a"). , 52b"), the inner peripheral surface on the side of the base end portion 100b is formed in a semicircular shape in plan view, and passes through each portion on the side of the front end portions 21a, 21b of the clamp arms 11a, 11b (hereinafter also referred to as "the front end" 51a, 51b") on the side of the top part 100a (the part corresponding to the front end parts 21a, 21b) is formed in an arc-shaped elongated ring shape in plan view, and the curvature of the inner peripheral surface on the side of the top part 100a is lower than that of the base The curvature of the inner peripheral surface on the side of the end portion 100b is small (the radius of curvature of the inner peripheral surface on the side of the top portion 100a is larger than the radius of curvature of the inner peripheral surface on the side of the base end portion 100b).

Further, as shown in FIG. 5 , the clamp arms 11 a and 11 b form an annular (substantially elliptical) magnetic circuit Mc by each of the core bodies 41 in a state of being formed into the annular body 100 . In this case, when a current flows through the conductor 400 surrounded (clamped) by the clamp arms 11a and 11b, a magnetic field is generated in the magnetic circuit Mc due to the current, and the magnetic detection element of the clamp arm 11a detects the magnetic field.

In addition, as shown in FIG. 6 , the outer shape of the cross-section plane Sc1 (for example, the cross section taken along the line A-A in FIG. 4 ) of the clamp arms 11 a and 11 b orthogonal to the longitudinal direction of the distal end side portions 51 a and 51 b is formed to be approximately eight, for example. The outer shape of the cross-section plane Sc2 (for example, the cross section taken along the line B-B in FIG. 4 ) of the clamp arms 11a and 11b perpendicular to the longitudinal direction of the proximal end portion side parts 52a and 52b is substantially rectangular. In addition, as shown in FIG. 6 , in the clamp arms 11a and 11b, the area Sa1 of the outer shape of the cut surface Sc1 at the distal end side parts 51a and 51b is formed to be larger than the cut surface Sc2 at the base end part side parts 52a and 52b. The area Sa2 of the outer shape (hereinafter, also referred to as "area Sa" when the areas Sa1 and Sa2 are not distinguished) is small (the area Sa2 is larger than the area Sa1). That is, the clamp arms 11a and 11b are formed so that the distal end portion side portions 51a and 51b are thinner than the proximal end portion side portions 52a and 52b.

Here, in this clamp sensor 2, the distal end portion side sites 51a, 51b and the proximal end portion side sites 52a, 52b are defined as follows. First, as shown in FIG. 5 , pass through the top portion 100 a of the annular body 100 and the magnetic circuit Mc (indicated by the dotted line in the same drawing) which is formed by each core 41 in a plan view of the graph center C1 . The straight line is defined as straight line H1. Next, a length corresponding to 40% of the distance D101 (straight-line distance) from the top portion 100a (specifically, the outer facing surface 101 in the top portion 100a) to the centroid C1 is determined as the length L101, and the length L101 is determined as the length L101. An arbitrary point within the range of the length L101 having the centroid C1 as the center is defined (hereinafter, also referred to as "predetermined point P101"). In this case, in this example, a point separated from the centroid C1 toward the top 100a by a length corresponding to 17% of the distance D101 is defined as the predetermined point P101. Next, the plane passing through the predetermined point P101 and orthogonal to the straight line H1 is defined as the boundary surface Sb1, and the portion between the boundary surface Sb1 at the clamp arms 11a, 11b and the front end portions 21a, 21b is defined as the front end portion side portion 51a and 51b define the positions between the boundary surface Sb1 and the proximal end portions 22a and 22b as proximal end portion side portions 52a and 52b.

Further, as shown in FIGS. 1 , 3 and 4 , each of the distal end side portions 51 a and 51 b of the clamp arms 11 a and 11 b has a pair of opposing surfaces 101 (equivalent to the first an opposing surface), a pair of opposing surfaces 102 (corresponding to the second opposing surface) constituting the two side surfaces of the annular body 100, a pair of opposing surfaces 103 inclined with respect to the opposing surfaces 101 and 102, and a pair of opposing surfaces 104 ( Each corresponds to the third opposing surface, and as an example of a plurality of pairs, a total of two pairs of third opposing surfaces), as shown in FIG. The outer shape of the cross-section plane Sc1 (cross section along the line A-A in FIG. 4 ) in which the longitudinal directions of the arms 11a and 11b are orthogonal is an octagonal (approximately octagonal) shape. In other words, each of the front-end side portions 51a and 51b of the clamp arms 11a and 11b is formed by chamfering the corners of the quadrangular prism shown by the dotted line in FIG. (chamfered surface)). In addition, since the cross-sectional shapes of the respective front-end side parts 51a and 51b are the same, in the same drawings, only the cross-sectional shape of the front-end part-side part 51a is shown, and the figure of the cross-sectional shape of the front-end part-side part 51b is omitted. Show.

In addition, as shown in FIG. 7 , in this clamp sensor 2, among the distal end side portions 51a and 51b of the clamp arms 11a and 11b, the portions excluding the distal end portions 21a and 21b are formed such that the outer shape of the cut surface Sc1 is eight. Among the sides of the polygon, each side E1 corresponding to each facing surface 101 and each side E2 corresponding to each facing surface 102 have the same length L1, and each side E3 corresponding to each facing surface 103 has the same length (connecting the sides). The lengths of the line segments at the respective ends of E3) and the lengths of the respective sides E4 corresponding to the opposing surfaces 104 (the lengths of the line segments connecting the respective ends of the respective sides E4) have the same length L2. In addition, in this clamp sensor 2, as shown in the same drawing, each of the distal end side parts 51a and 51b is formed so that the length L2 is longer than the length L1 (the shortest length among the lengths of the sides E1 and E2).

In the example shown in FIG. 7 , since the sides E3 and E4 are respectively straight lines, the lengths of the line segments connecting the two ends of the sides E3 and E4 are the same as those of the sides E3 and E4. However, the sides can also be used. E3 and E4 are curvilinear (arc-shaped) structures (the outer shape of the cut surface Sc1 is an approximately octagonal structure), and in this structure, the length of the line segment connecting the respective ends of the sides E3 and E4 is formed as the length L2 Each of the front-end portion side parts 51a and 51b is such that the length L2 is longer than the length L1 (the shortest length among the lengths of the sides E1 and E2).

In this clamp sensor 2, the length L1 of the sides E1, E2 and the length L2 of the sides E3, E4 are defined in the above-mentioned manner, and the distal end side portions 51a, 51b are formed as shown in FIG. The relative distance D3 of each side E3 and the relative distance D4 of each side E4 are made shorter than the relative distance D1 of each side E1 and the relative distance D2 of each side E2.

In addition, in this clamp sensor 2, as shown in FIG. 7, each part of the sensor housings 10a, 10b constituting the housing of the clamp arms 11a, 11b corresponding to the respective distal end side parts 51a, 51b (hereinafter, also referred to as The thickness T referred to as "the portion on the front end portion side of the sensor housings 10a, 10b") is formed so as to be uniform (or substantially uniform) in the state observed at the cutting plane Sc1.

In addition, in this clamp sensor 2, as shown in FIG. 8, the opposing surfaces 101 on the outer peripheral side of the distal end portions 21a and 21b of the clamp arms 11a and 11b (the opposing surfaces 101 constituting the outer peripheral surface of the annular body 100) The annular body 100 is formed so as to form a plane orthogonal to the direction (the vertical direction in the same drawing) connecting the top portion 100 a and the proximal end portion 100 b of the annular body 100 . That is, it is formed in the shape which cut|disconnected a part (part shown by the dotted line in the same drawing) of the outer peripheral side in the top part 100a of the annular body 100 with a flat surface. As described above, in this clamp sensor 2, the clamp arms 11a, 11b are formed so that the relative distance D1 (hereinafter, the relative distance D1) of the respective opposing surfaces 101 at the distal end portions 21a, 21b is formed as shown in the same drawing. , the relative distance D1 is also referred to as “relative distance D1a”) than the relative distance D1 (hereinafter, the relative distance is also referred to as the relative distance between the opposing surfaces 101 of the clamp arms 11a and 11b excluding the front end portions 21a and 21b) D1 is called "relative distance D1b") is short. Therefore, in this clamp sensor 2, the length of the annular body 100 in the direction connecting the top portion 100a and the base end portion 100b is shortened corresponding to the shortening of the relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b. .

In addition, in this clamp sensor 2, as shown in FIG. 8, the clamp arms 11a, 11b are formed so that the length L103 along the straight line H1 between the position P and the outer facing surface 101 of the annular body 100 is 9 mm or more Within the range of 11 mm or less, the position P is separated by 15 mm from the center of the top portion 100 a along the direction perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100 (hereinafter, this length is also referred to as "Length L102") position. That is, the clamp arms 11a and 11b are formed so that the ratio of the length L103 to the length L102 is in the range of not less than 9/15 and not more than 11/15.

Here, for example, when the clamp arms 11a and 11b are formed so that the length L103 is greater than 11 mm, the shape of the front end portions 21a and 21b of the clamp arms 11a and 11b is too slender. When 11a and 11b clamp the conductor 400 arranged near the wall surface (the wall surface exists behind), the front end portions 21a and 21b of the clamp arms 11a and 11b come into contact with the wall surface, which may make clamping difficult. Furthermore, when the clamp arms 11a and 11b are formed so that the length L103 is longer than 11 mm, the top 100a side of the annular body 100 is formed in an abnormally elongated shape, and the detection characteristics of the magnetic field (detected amount) may be deteriorated. On the other hand, when the clamp arms 11a and 11b are formed so that the length L103 is less than 9 mm, the shape of the front end portions 21a and 21b of the clamp arms 11a and 11b is close to an arc shape. For example, when it is desired to use the clamp arms When 11a and 11b clamp one conductor 400 among the plurality of conductors 400 arranged close to each other, it may be difficult for the front end portions 21a and 21b to be inserted into the gap between the one conductor 400 and the adjacent other conductor 400, so that the clamping becomes difficult. difficult. On the other hand, in the clamp sensor 2, the clamp is formed so that the length L103 along the straight line H1 between the position P and the opposing surface 101 on the outer side of the annular body 100 is within the range of 9 mm or more and 11 mm or less. The clamping arms 11a and 11b can maintain the detection characteristics of the magnetic field well, and can reliably clamp the conductor 400, wherein the position P is along a line perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100 The directions are 15mm apart from the center of the top 100a.

In addition, in this clamp sensor 2, as shown in FIG. 9, the clamp arms 11a and 11b are formed so that the straight line distance between any two points in the outer shape of the cross-section plane Sc1 at the distal end side parts 51a and 51b is the longest among the two points. The long distance is referred to as a relative distance D1 (see also FIG. 7 ), and the separation distance between the front end portions 21 a and 21 b in a state in which the front end portions 21 a and 21 b of the clamp arms 11 a and 11 b are separated from each other at a maximum is defined as The separation distance D102, at this time, the ratio R of the relative distance D1 to the separation distance D102 is in the range of not less than 1/6 and not more than 1/5. In addition, in this clamp sensor 2, as an example, the separation distance D102 is specified to be within a range of 56.8 mm±25%, and the relative distance D1 is specified to be within a range of 11 mm±25%.

Here, according to the experimental results of the inventors, when the clamp arms 11a and 11b are formed so that the ratio R is larger than 1/5, for example, as shown in FIG. When one of the conductors 400 is clamped, it is difficult to insert the front ends 21a and 21b of the clamp arms 11a and 11b into the narrow gaps G1 and G2 between the adjacent conductors 400 . On the other hand, when the clamp arms 11a, 11b are formed so that the ratio R is smaller than 1/6, the respective distal end portions 21a, 21b are separated from each other at the maximum distance, that is, the separation in the state where the lever 30a is pushed in the maximum If the distance D102 is too long, when a plurality of conductors 400 are arranged side by side at a narrow interval, even if only one of the conductors 400 is intended to be clamped, the plurality of conductors 400 may be clamped. Therefore, it is necessary to adjust the lever 30a The amount of press-in may deteriorate the operating performance. On the other hand, in this clamp sensor 2, the clamp arms 11a and 11b are formed so that the ratio R is in the range of not less than 1/6 and not more than 1/5, and the lever 30a is pressed in the state to the maximum extent. Therefore, the tip portions 21a and 21b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 . Therefore, in this clamp-type sensor 2, it is not necessary to adjust the pressing amount of the lever 30a, so that the operability can be sufficiently improved.

In addition, in this clamp sensor 2, as described above, the proximal end side portions 52a and 52b of the clamp arms 11a and 11b are formed in a substantially rectangular shape in cross section, and as shown in FIG. 4 , the distal end portion side portions 51a, 51b are thinner than the proximal end side parts 52a, 52b, that is, as shown in FIG. The clamp arms 11a and 11b are formed so that the area Sa2 of the outer shape of the cut surface Sc2 at 52b is small. In other words, each of the clamp arms 11a and 11b is formed such that the proximal end side parts 52a and 52b are thicker than the distal end part side parts 51a and 51b, that is, the area of the cut surface Sc2 of the proximal end part side parts 52a and 52b is larger than that of the distal end part side parts 52a and 52b. The area of the cross-section plane Sc1 of the part-side parts 51a and 51b is large. Therefore, compared with the structure in which each clamp arm 11a, 11b is formed so that the area of the cross-section surface Sc1 of the distal-end side parts 51a, 51b is the same as the area of the cross-section surface Sc2 of the base-end part-side parts 52a, 52b, in this In the clamp sensor 2, the strength of the clamp arms 11a and 11b is sufficiently improved.

In addition, in this clamp sensor 2, as described above, the positions between the boundary surface Sb1 passing through the predetermined point P101 and orthogonal to the straight line H1 and the distal end portions 21a, 21b are defined as the distal end portion side portions 51a, 51b, The portion between the boundary surface Sb1 and the proximal end portions 22a, 22b is defined as the proximal end portion side portions 52a, 52b, and the predetermined point P101 is a point defined within the range of the length L101, which is a magnetic circuit The centroid C1 of the figure in plan view of Mc is the center and corresponds to a length corresponding to 40% of the distance D101 from the top 100a to the centroid C1. In this case, when a surface passing through a point beyond the length L101 and a point close to the top 100a is defined as the boundary surface Sb1, the lengths of the front end side parts 51a and 51b having a small (thin) area Sa are short, When clamping one conductor among the plurality of conductors 400 arranged at a narrow interval, the front end portions 21 a and 21 b of the clamp arms 11 a and 11 b are inserted into the narrow space between the adjacent conductors 400 . The back side of the gaps G1 and G2 becomes difficult. On the other hand, when the surface passing through the point beyond the length L101 and close to the base end portion 100b is defined as the boundary surface Sb1, the base end portion side parts 52a and 52b having the larger area Sa (thicker) have longer lengths than the base end portion 100b. Shorter, the strength of the clamp arms 11a, 11b decreases. On the other hand, in this clamp sensor 2, since the surface passing through the predetermined point P101 defined within the range of the length L101 is defined as the boundary surface Sb1, the strength of the clamp arms 11a, 11b can be reduced without reducing the strength In this case, the front end portions 21a and 21b of the clamp arms 11a and 11b are easily inserted into the inner sides of the narrow gaps G1 and G2 between the adjacent conductors 400 .

As shown in FIG. 2 , the main body portion 3 includes a display portion 31 , an operation portion 32 , a processing portion 33 , and a main body case 30 (refer to FIGS. 1 , 3 , and 4 ) in which the above-mentioned parts are accommodated or arranged.

The display unit 31 is composed of, for example, a liquid crystal panel, and is disposed on the front panel of the main body casing 30 as shown in FIGS. 1 , 3 , and 4 . In addition, the display unit 31 displays the current measurement value and the like under the control of the processing unit 33 . The operation unit 32 is configured to include various switches 32a, a dial 32b, and the like arranged on the front panel of the main body case 30, and outputs operation signals corresponding to operations of these members.

The processing part 33 controls each part which comprises the main body part 3 based on the operation signal output from the operation part 32. Further, the processing unit 33 functions as a measuring unit that measures the current value of the current flowing through the conductor 400 based on the detection signal output from the clamp sensor 2 (magnetic detection element), and displays it on the display unit 31 .

Next, a method of using the clamp meter 1 and the operation of the clamp meter 1 during use will be described with reference to the drawings. As an example, as shown in FIG. 10 , the current value of the current flowing in one conductor (for example, conductor 400a shown in the same drawing) among a plurality of conductors 400 arranged at narrow intervals is measured. In this case, how to use it will be explained. In this case, in this example, a plurality of conductors 400 having a diameter of 21 mm are arranged side by side at intervals of 12 mm (a gap between adjacent conductors 400 is 12 mm).

First, the lever 30a (see FIGS. 1 and 4 ) of the main body 3 of the clamp meter 1 is pushed in. At this time, the clamp arm 11b is rotated in a direction in which the front end portions 21a, 21b of the clamp arms 11a, 11b in the clamp sensor 2 are opened against each other against the urging force of the spring not shown in the drawing, so that as shown in FIG. 3 , the clamp arms 11a and 11b are in the open state.

Next, as shown in FIG. 10, the front-end|tip parts 21a and 21b of the clamp arms 11a and 11b are brought close to the conductor 400a of the measuring object (clamping object). Then, as shown in FIG. 11 , the clamp meter 1 is rotated and tilted about the longitudinal direction of the clamp meter 1 (the direction connecting the top 110 a and the base end 100 b of the annular body 100 shown in FIG. 4 ) as an axis. The front end portion 21a of the clamp arm 11a is inserted into the gap G1 between the conductor 400b and the conductor 400a adjacent to the right side of the conductor 400a, and the front end portion 21b of the clamp arm 11b is inserted into the left side of the conductor 400a The gap G2 between the adjacent conductors 400c and the conductors 400a.

Here, as shown by the dotted line in FIG. 7 , the outer shape of the cut surface Sc1 at each of the front end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a conventional quadrilateral structure (the corners of the quadrangular prism are not aligned with each other). In the structure with chamfered parts), the outer shape of the cut surface Sc1, that is, the distance between the opposite corners of the quadrilateral (diagonal distance D5 shown in the same drawing) is greater than the relative distance D1 of each side E1 and each side E2 The relative distance D2 is long. Therefore, in the conventional structure, as shown in FIG. 11, when the gap G1 between the conductors 400a and 400b and the gap G2 between the conductors 400a and 400c are narrow, when the clamp meter 1 is inclined, it is difficult to clamp the clamp The front end portions 21a and 21b of the tightening arms 11a and 11b are inserted into the respective gaps G1 and G2.

On the other hand, in this clamp sensor 2, as described above, the respective distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed such that the corners of the quadrangular prism are chamfered so that the cut surface Sc1 is The outer shape is in the shape of an octagonal octagonal prism, and the length L2 of the sides E3 and E4 of the octagon, which is the outer shape of the cut surface Sc1 , is longer than the length L1 of the sides E1 and E2. Therefore, in this clamp sensor 2, the relative distance D3 of each side E3 and the relative distance D4 of each side E4 are shorter than the relative distance D1 of each side E1 and the relative distance D2 of each side E2. Therefore, in the clamp sensor 2, compared with the conventional structure, the tip portions 21a, 21b of the clamp arms 11a, 11b can be easily inserted into the narrow gaps G1, G2.

Further, in this clamp sensor 2, as described above, the clamp arms 11a and 11b are formed so that the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 or more and 1/5 or less. In the state where the lever 30a is pushed in to the maximum, the tip portions 21a and 21b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400, wherein the relative distance D1 is the portion on the tip portion side. The longest distance between any two points in the outer shape of the cut surface Sc1 at 51a, 51b, the separation distance D102 is the state in which the front end portions 21a, 21b of the clamp arms 11a, 11b are separated from each other at the maximum The separation distance between the front end portions 21a and 21b. Therefore, in this clamp-type sensor 2, it is not necessary to adjust the pressing amount of the lever 30a, so that the operability can be sufficiently improved.

Next, in a state in which the front end portions 21a and 21b of the clamp arms 11a and 11b are inserted into the gaps G1 and G2, respectively, the press-fitting of the lever 30a is released. At this time, the clamp arm 11b is rotated in the direction in which the front end portions 21a and 21b of the clamp arms 11a and 11b come into contact with each other by the urging force of the spring not shown in the drawing, so that the clamp arm 11b is clamped as shown in FIG. 12 . The arms 11a and 11b are formed in a closed state. Thus, as shown in the same drawing, the conductor 400a is clamped by the clamp arms 11a, 11b.

In this case, in this clamp sensor 2, as described above, each of the clamp arms 11a and 11b is formed so as to pass the boundary surface Sb1 passing through the predetermined point P101 and the distal end portions 21a and 21b of the clamp arms 11a and 11b. The parts between are defined as the distal end side parts 51a, 51b, and the parts between the boundary surface Sb1 and the proximal end parts 22a, 22b of the clamp arms 11a, 11b are defined as the proximal end part side parts 52a, 52b, and the distal end side The area Sa1 of the outer shape of the cut surface Sc1 at the parts 51a and 51b is smaller than the area Sa2 of the outer shape of the cut surface Sc2 of the base end side parts 52a and 52b, and the predetermined point P101 is defined within the range of the length L101, so The length L101 is a length corresponding to 40% of the distance D101 from the top portion 100a to the centroid C1 of the pattern in a plan view of the magnetic circuit Mc. Therefore, in this clamp sensor 2, the distal ends 21a and 21b of the clamp arms 11a and 11b can be easily inserted between the adjacent conductors 400 without reducing the strength of the clamp arms 11a and 11b. the inner side of the narrower gaps G1 and G2. Therefore, in this clamp sensor 2, the conductor 400a can be clamped reliably.

Next, the magnetic detection element arranged in the clamp arm 11a detects the magnetic field generated in each of the cores of the clamp arms 11a and 11b by the current flowing in the conductor 400a, and outputs a detection signal. In this case, in the clamp sensor 2, as described above, the length L103 along the straight line H1 between the position P and the outer facing surface 101 of the annular body 100 is in the range of 9 mm or more and 11 mm or less. The clamp arms 11a and 11b are formed such that the position P is a position separated by 15 mm from the center of the top portion 100a along a direction orthogonal to the straight line H1 and parallel to the opening surface F of the annular body 100 . Therefore, in this clamp sensor 2, the detection characteristics of the magnetic field can be maintained favorably. Therefore, in this clamp sensor 2, it is possible to output a detection signal capable of accurately measuring the current flowing through the conductor 400a. Next, the processing unit 33 of the main body unit 3 measures the current value of the current flowing through the conductor 400a based on the detection signal. Next, the processing unit 33 causes the display unit 31 to display the measurement value.

Then, when the measurement is completed, the lever 30a is pushed in to open the clamp arms 11a and 11b, and then the clamp sensor 2 is separated from the conductor 400a. Then, the pressing of the lever 30a is released, and the clamp arms 11a and 11b are brought into the closed state.

In this way, in the clamp sensor 2 and the clamp meter 1, the respective distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed to have an outer shape (in this example, an octagon or The length L2 of each of the sides E3 and E4 (or the length L2 of the line segment connecting the respective ends of the sides E3 and E4 ) is longer than the length L1 of each of the sides E1 and E2 . Therefore, in the clamp sensor 2 and the clamp meter 1, the relative distance D3 of each side E3 and the relative distance D4 of each side E4 can be made shorter than the relative distance D1 of each side E1 and the relative distance D2 of each side E2. As a result, according to the clamp sensor 2 and the clamp meter 1, the outer shape of the cut surface Sc1 of each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b is quadrangular, and the diagonal distance D5 of the cut surface Sc1 Compared with the conventional result formed in such a way that the relative distance D1 of each side E1 and the relative distance D2 of each side E2 (the structure in which the corners of the quadrangular prism are not chamfered), the clamp meter 1 can be tilted. The front end portions 21a, 21b of the clamp arms 11a, 11b are easily inserted into the narrow gaps G1, G2 in the state of Therefore, according to the clamp sensor 2 and the clamp meter 1, the conductor 400 to be clamped can be reliably clamped even when there are other conductors 400 or obstacles near the conductor 400 to be clamped.

In addition, according to the clamp sensor 2 and the clamp meter 1, the length L2 of the entire sides E3 and E4 (or the length L2 of all the line segments connecting the two ends of the sides E3 and E4) is greater than the length L2 of the sides E1 and E2. The length L1 of each of the clamp arms 11a and 11b is formed so that the front end side portions 51a and 51b of each of the clamp arms 11a and 11b are long, so that both the relative distance D3 of each side E3 and the relative distance D4 of each side E4 can be made shorter than that of each side E1. The relative distance D1 and the relative distance D2 of each side E2. Therefore, for example, even in a state where the clamp meter 1 is tilted by turning the clamp meter 1 in any rotational direction rightward or leftward about the longitudinal direction of the clamp meter 1, the clamp arms 11a, 11a, The front end portions 21a, 21b of 11b are easily inserted into the narrow gaps G1, G2.

In addition, in the clamp sensor 2 and the clamp meter 1, the thickness T of the portion on the distal end side of each sensor case 10a, 10b constituting the housing of each clamp arm 11a, 11b is viewed at the cut surface Sc1 The clamp arms 11a and 11b are formed so as to be uniform (or substantially uniform) in a state. Therefore, according to the clamp sensor 2 and the clamp meter 1, it is possible to avoid the thickness T of the sensor cases 10a and 10b being relatively large compared to the structure in which the thickness T of the parts on the distal end side of the sensor cases 10a and 10b is not uniform. The stress is concentrated in the thin portion, and the strength of the sensor housings 10a and 10b is increased. Therefore, the sensor housings 10a and 10b can be reliably prevented from being damaged when a load is applied to the sensor housings 10a and 10b.

Further, according to the clamp sensor 2 and the clamp meter 1, each clamp is formed so that the area of the cut surface Sc2 of the proximal end portion side portions 52a, 52b is larger than the area of the cut surface Sc1 of the distal end portion side portions 51a, 51b The arms 11a, 11b are compared with the structure in which the clamp arms 11a, 11b are formed so that the area of the cross-sectional surface Sc1 of the distal-end side parts 51a, 51b is the same as the area of the cross-sectional surface Sc2 of the base-end-side parts 52a, 52b , the strength of the clamp arms 11a and 11b can be sufficiently improved.

In addition, in the clamp sensor 2 and the clamp meter 1, the area Sa1 of the outer shape of the cut surface Sc1 at the front end side portions 51a and 51b between the boundary surface Sb1 and the front end portions 21a and 21b is greater than the boundary surface Sb1 and the boundary surface Sb1. The clamp arms 11a and 11b are formed such that the area Sa2 of the outer shape of the cut surface Sc2 at the base end side parts 52a and 52b between the base end parts 22a and 22b is small, and the boundary surface Sb1 passes through the length L101. The points within the range are orthogonal to the straight line H1, and the length L101 is on the straight line H1 on the centroid C1 of the graph when the top 110a of the annular body 100 and the magnetic circuit Mc are viewed from above, and the centroid C1 is center and a length equivalent to 40% of the distance D101 from the top 100a to the centroid C1. In this case, when a surface passing through a point beyond the length L101 and a point close to the top 100a is defined as the boundary surface Sb1, the lengths of the front-end side parts 51a and 51b having a smaller area Sa1 (that is, thinner) are relatively small. It is difficult to insert the tip portions 21a and 21b of the clamp arms 11a and 11b into the gap between the adjacent conductors 400 when clamping one of the conductors 400 arranged side by side at a narrow interval. The inner side of the narrow gaps G1 and G2. On the other hand, when the surface passing through the point beyond the length L101 and close to the base end portion 100b is defined as the boundary surface Sb1, the base end portion side parts 52a and 52b having the larger area Sa2 (that is, the larger area) have The shorter the length, the lower the strength of the clamp arms 11a, 11b. On the other hand, in this clamp sensor 2, since the surface passing through the predetermined point P101 defined within the range of the length L101 is defined as the boundary surface Sb1, the strength of the clamp arms 11a, 11b can be reduced without reducing the strength In this case, the front end portions 21a and 21b of the clamp arms 11a and 11b are easily inserted into the inner sides of the narrow gaps G1 and G2 between the adjacent conductors 400 . Therefore, according to this clamp sensor 2, the conductor 400a can be clamped reliably.

In addition, in the clamp sensor 2 and the clamp meter 1, the clamp arms 11a, 11b are formed such that the opposing surfaces 101 on the outer peripheral side of the distal end portions 21a, 21b of the clamp arms 11a, 11b are formed as In the state where the annular body 100 is formed, it is a plane perpendicular to the direction connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100, and the relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b is greater than The relative distance D1b of the respective opposing surfaces 101 at the positions other than the respective front end portions 21a and 21b of the respective clamp arms 11a and 11b is short. Therefore, according to the clamp sensor 2 and the clamp meter 1, it is possible to more easily insert the tip portions 21a, 21b of the clamp arms 11a, 11b into the narrow gaps G1, G2. In addition, since the relative distance D1a between the opposing surfaces 101 at the front end portions 21a and 21b is short, for example, even if there is an obstacle such as a wall behind the conductor 400 to be clamped, the distance between the conductor 400 and the obstacle is still relatively short. Even when the gap is narrow, it is possible to prevent an obstacle from coming into contact with each of the clamp arms 11a and 11b, and to clamp the conductor 400 to be clamped reliably.

In addition, in the clamp sensor 2 and the clamp meter 1, the length L103 along the straight line H1 between the position P and the opposing surface 101 on the outer side of the annular body 100 is formed so that the length L103 along the straight line H1 is within the range of 9 mm or more and 11 mm or less. In the clamp arms 11a and 11b, the position P is a position separated by 15 mm from the center of the top portion 100a along a direction orthogonal to the straight line H1 and parallel to the opening surface F of the annular body 100 . In this case, when the clamp arms 11a and 11b are formed so that the length L103 is greater than 11 mm, the shape of the front end portions 21a and 21b of the clamp arms 11a and 11b is too slender. For example, when it is desired to use the clamp arms When 11a and 11b clamp the conductor 400 arranged near the wall surface, the front end portions 21a and 21b of the clamp arms 11a and 11b come into contact with the wall surface, which may make clamping difficult. Furthermore, when the clamp arms 11a and 11b are formed so that the length L103 is longer than 11 mm, the top 100a side of the annular body 100 is formed in an abnormally elongated shape, and the detection characteristics of the magnetic field (detected amount) may be deteriorated. On the other hand, when the clamp arms 11a and 11b are formed so that the length L103 is less than 9 mm, the shape of the front end portions 21a and 21b of the clamp arms 11a and 11b is close to an arc shape. For example, when it is desired to use the clamp arms When 11a and 11b clamp one conductor 400 among the plurality of conductors 400 arranged close to each other, it may be difficult for the front end portions 21a and 21b to be inserted into the gap between the one conductor 400 and the adjacent other conductor 400, so that the clamping becomes difficult. difficult. On the other hand, according to the clamp sensor 2, the clamp arms 11a and 11b are formed so that the length L103 is in the range of 9 mm or more and 11 mm or less, the magnetic field detection characteristics can be maintained well, and the conductor can be clamped more reliably. 400.

In addition, in the clamp sensor 2 and the clamp meter 1, the clamp arms 11a and 11b are formed so that the relative distance D1 is separated within a range of not less than 1/6 of the distance D102 and not more than 1/5 of the distance. The relative distance D1 is the longest distance between any two points in the outer shape of the cut surface Sc1 at the front end side portions 51a, 51b, and the separation distance D102 is the front end portions 21a, 21b of the clamp arms 11a, 11b. The separation distance between the respective front end portions 21a and 21b in the state where they are most separated from each other. In this case, when the clamping arms 11a and 11b are formed so that the ratio R is larger than 1/5, it is difficult to clamp one of the conductors 400 arranged side by side at a narrow interval. The tip portions 21a and 21b of the clamp arms 11a and 11b are inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 . On the other hand, when the clamp arms 11a, 11b are formed so that the ratio R is less than 1/6, the separation distance D102 in a state where the control rod 30a is pushed in to the maximum and the respective front end portions 21a, 21b are separated from each other at the maximum If the length is too long, when the plurality of conductors 400 are arranged side by side at a narrow interval, the plurality of conductors 400 may be clamped. Therefore, it is necessary to adjust the pressing amount of the lever 30a, and the operability may be deteriorated. On the other hand, according to the clamp sensor 2, the clamp arms 11a and 11b are formed so that the relative distance D1 is in the range of 1/6 or more and 1/5 or less of the separation distance D102, so that the control lever can be moved to the maximum extent. The tip portions 21a and 21b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 in a state where the 30a is pressed in. Therefore, the handling performance can be sufficiently improved, and only the plurality of conductors can be inserted more reliably. One of the conductors in 400 is clamped.

In addition, the structures of the clamp sensor and the measuring device are not limited to the above-mentioned structures. In the above, for example, only the front end side portions 51a and 51b of the clamp arms 11a and 11b have an octagon in the outer shape of the cut surface Sc1 and the lengths L2 of the sides E3 and E4 of the octagon are compared An example in which the length L1 of the sides E1 and E2 is formed to be long and the base-end side parts 52a and 52b of the clamp arms 11a and 11b are formed in a substantially rectangular cross-section has been described. However, it is also possible to use Both of the respective distal end side portions 51a and 51b and the respective proximal end portion side portions 52a and 52b of the clamp arms 11a and 11b are formed in the above-described configuration. By adopting the above configuration, both the distal end side portions 51a and 51b and the proximal end portion side portions 52a and 52b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps.

In addition, it is also possible to adopt a configuration in which both the distal end side portions 51a and 51b and the proximal end portion side portions 52a and 52b of the clamp arms 11a and 11b are formed such that the sides E3 and E4 are curved (arc-shaped). .

In addition, each front end portion of the clamp arms 11a, 11b is formed so that the sides E1, E2 of the octagon, which are the outer shape of the cut surface Sc1, have the same length L1 and the sides E3, E4 have the same length L2. The example of the side portions 51a and 51b has been described, but the respective front end portions of the clamp arms 11a and 11b may be formed such that the lengths of the sides E1 and E2 are different and the lengths of the sides E3 and E4 are different. The structure of the side parts 51a and 51b (or both of the front end part side parts 51a and 51b and the base end part side parts 52a and 52b).

In the above, an example has been described in which the length L2 of the entire side E3 and E4 is longer than the length L1 of the side E1 and E2. , however, as long as the length of at least one of the sides E3 and E4 is longer than the shortest length of the lengths of the sides E1 and E2, the lengths of the sides E1, E2, E3, and E4 can be arbitrarily defined. .

In addition, in the above, the relative distance between the respective opposing surfaces 101 at the front end portions 21a and 21b is determined by cutting off a part of the outer peripheral side at the top portion 100a of the annular body 100 (the portion shown by the dotted line in FIG. 8 ). An example in which each of the clamp arms 11a and 11b is formed so that the relative distance D1b of the opposing surfaces 101 at the positions other than the distal end portions 21a and 21b of the clamp arms 11a and 11b is shorter than the relative distance D1b of the clamp arms 11a and 11b has been described. A structure in which a part of the outer peripheral side at the top part 100a (the part shown by the dotted line in FIG. 8 ) is not cut out.

In addition, the example in which the clamp sensor 2 detects the magnetic field, which is the amount to be detected, and the processing unit 33 measures the current, which is the amount to be detected, has been described above. However, the amount to be detected and the amount to be measured are not limited to magnetic fields and currents, but also Various physical quantities such as voltage, electricity, and resistance.

In addition, a clamp meter 1A including the clamp sensor 2A and the main body portion 3 shown in FIG. 13 can also be used. In addition, in the following description, the same code|symbol is attached|subjected to the same component as the clamp sensor 2 and the clamp meter 1 mentioned above, and the repeated description is abbreviate|omitted.

In this clamp-type sensor 2A, the distal end portion side portions 51a and 51b and the proximal end portion side portions 52a and 52b are defined as follows. First, as shown in FIG. 13 , the straight line H2 of the centroid C2 of the figure (shaded figure in the same drawing) in plan view passing through the top 100 a of the annular body 100 and the inner circumference of the annular body 100 Provisions have been made. Next, a length corresponding to 40% of the distance D101A (straight-line distance) from the top portion 100a (specifically, the opposite surface 101 on the outer side of the top portion 100a shown in FIG. 8 ) to the centroid C2 is determined as the length L101A, and the An arbitrary point within the range of the length L101A centered on the centroid C2 on the straight line H2 is defined (hereinafter, also referred to as "predetermined point P101A"). In this case, in this example, a point separated from the centroid C2 toward the top 100a by a length corresponding to 14% of the distance D101 is defined as a predetermined point P101A. Next, the plane passing through the predetermined point P101A and orthogonal to the straight line H2 is defined as the boundary surface Sb2, and the portion between the boundary surface Sb2 in the clamp arms 11a, 11b and the front end portions 21a, 21b is defined as the front end portion side portion 51a and 51b, and the parts between the boundary surface Sb1 and the proximal end parts 22a and 222b are defined as the proximal end part side parts 52a and 52b.

In this clamp sensor 2A as well, as shown in FIG. 7 , the respective distal end side portions 51 a and 51 b of the clamp arms 11 a and 11 b are formed in the same shape as the same portion in the clamp sensor 2 . Also, in this clamp sensor 2A, as shown in FIG. 6 , the area Sa1 of the outer shape of the cut surface Sc1 at the distal end side parts 51a, 51b is larger than the cut surface area at the base end part side parts 52a, 52b The clamp arms 11a and 11b are formed so that the area Sa2 of the outer shape of Sc2 is small. Therefore, according to this clamp sensor 2A, similarly to the clamp sensor 2, the distal ends 21a and 21b of the clamp arms 11a and 1b can be easily inserted into the clamp arms 11a and 11b without reducing the strength of the clamp arms 11a and 11b. The inner side of the narrow gaps G1 and G2 between the adjacent conductors 400 . Therefore, according to this clamp sensor 2, the conductor 400 can be clamped reliably.

Also, in this clamp sensor 2A, as shown in FIG. 8 , the length L103 along the straight line H1 between the position P and the facing surface 101 on the outer side of the annular body 100 is in the range of 9 mm or more and 11 mm or less. The clamping arms 11a and 11b are formed inwardly, wherein the position P is a position separated by 15 mm from the center of the top portion 100a along a direction perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100 . Therefore, according to this clamp sensor 2A, similarly to the clamp sensor 2 , the detection characteristics of the magnetic field can be maintained favorably, and the conductor 400 can be clamped more reliably.

Also, in this clamp sensor 2A, as shown in FIG. 9 , the clamp arms 11 a and 11 b are formed so that: a straight line between any two points in the outer shape of the cut surface Sc1 at the distal end side parts 51 a and 51 b is formed. The longest distance among the distances is set as the relative distance D1 (see also FIG. 7 ), and the distance between the respective tip portions 21a, 21b in a state where the respective tip portions 21a, 21b of the respective clamp arms 11a, 11b are most separated from each other The distance is set as the separation distance D102, and at this time, the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 or more and 1/5 or less. Therefore, according to this clamp sensor 2A, similarly to the clamp sensor 2, the distal end portions 21a and 21b can be easily inserted into the narrow space between the adjacent conductors 400 while the lever 30a is pushed in to the maximum extent. Therefore, the handling performance can be sufficiently improved, and only one conductor of the plurality of conductors 400 can be clamped more reliably.

In addition, the clamp sensor 202 shown in FIG. 7 may also be used. In this clamp sensor 202, like the clamp sensor 2 described above, each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b has a pair of opposing surfaces 101, a pair of opposing surfaces 102, a pair of opposing surfaces 103 and a pair of opposing surfaces 104, as shown in the same drawing, each of the front end side portions 51a, 51b of the clamp arms 11a, 11b is formed as a cut surface Sc1 orthogonal to the longitudinal direction of the clamp arms 11a, 11b The outer shape is, for example, an octagon (an example of a substantially octagon) shape (an octagonal prism shape obtained by chamfering each corner of a quadrangular prism shown by a dotted line in the same drawing).

In addition, in this clamp sensor 202, as shown in FIG. 5, similarly to the clamp sensor 2 described above, the parts between the boundary surface Sb1 and the front end parts 21a and 21b are defined as the front end part side parts 51a and 51b, In addition, the portion between the boundary surface Sb1 and the proximal end portions 22a and 22b is defined as the proximal end portion side portions 52a and 52b, wherein the boundary surface Sb1 passes through the length of the center of the centroid C1 defined on the straight line H1. The predetermined point P101 within the range of L101 is orthogonal to the straight line H1. In addition, as shown in FIG. 13 , similarly to the clamp sensor 2A described above, a configuration may be adopted in which the positions between the boundary surface Sb2 and the distal end portions 21a and 21b are defined as the distal end portion side portions 51a and 51b, and the boundary surface The portions between Sb2 and the proximal end portions 22a and 22b are defined as proximal end portion side portions 52a and 52b, wherein the boundary surface Sb2 passes through the range of the length L101A defined on the straight line H2 centered on the centroid C2 The predetermined point P101A is orthogonal to the straight line H2.

In addition, in this clamp sensor 202, as shown in FIG. 7 , the portions other than the distal end portions 21a, 21b of the respective distal end portion side portions 51a, 51b of the clamp arms 11a, 11b are formed such that the outer shape of the cut surface Sc1 is Among the sides of the octagon, each side E1 corresponding to each opposing surface 101 and each side E2 corresponding to each opposing surface 102 have the same length L1, and each side E3 corresponding to each opposing surface 103 and each opposing surface have the same length L1. Each side E4 corresponding to 104 has the same length L2. In addition, in this clamp sensor 202, the respective distal end side parts 51a and 51b are formed such that the relative distance D1 of each side E1 is the same as the relative distance D2 of each side E2, and the relative distance D3 of each side E3 (connecting each side The relative distance between the line segment at the two ends of one side of E3 and the line segment connecting the two ends of the other side of each side E3) and the relative distance D4 of each side E4 (the line segment connecting the two ends of one side of each side E4 and the line segment connecting the two ends of the other side E4) The relative distances of the line segments at both ends of the other side E4 are the same. In addition, in this clamp sensor 202, the relative distances D3 and D4 are greater than (100/√2) of the relative distances D1 and D2 (whichever is shorter between the relative distances D1 and D2) by the respective distal end side parts 51a and 51b. % and the relative distances D1 and D2 (the relative distances D1 and D2 which are any shorter distances) are formed so as to be 110% or less (99% as an example).

In this case, in the configuration in which the relative distances D3 and D4 are set to be (100/√2)% or less of the relative distances D1 and D2, the shape of the cut surface Sc1 is a thin shape (longitudinal or laterally long shape) ), and the core body 41 is also thin, and accordingly, the magnetic properties may be deteriorated, and the detection accuracy of the detected amount may be lowered. On the other hand, in a configuration in which the relative distances D3 and D4 are longer than 110% of the relative distances D1 and D2, it is difficult to sufficiently exert the effects described later by shortening the relative distances D3 and D4. Therefore, in this clamp sensor 202, in order to maintain the detection accuracy of the detected quantity at a high precision and to sufficiently exert the effect of shortening the relative distances D3 and D4, the relative distances D3 and D4 are set to be larger than The structure is within the range of (100/√2)% of the relative distances D1 and D3 and 110% or less of the relative distances D1 and D3.

In addition, in the example shown in FIG. 7 , since each side E3 is a straight line, the relative distance between a line segment connecting both ends of one side of each side E3 and a line segment connecting both ends of the other side of each side E3 It is the same as the relative distance D3 of each side E3, however, a structure in which each side E3 is a curve (arc) can also be used (the outer shape of the cut surface Sc1 is an approximately octagonal structure). The relative distance between the line segment at the two ends of one side of E3 and the line segment connecting the two ends of the other side of each side E3 is set as the relative distance D3, and the relative distance D3 is greater than the relative distances D1 and D2 (100/√2) % and within the range of 110% or less of the relative distances D1 and D2, the respective distal end portion side sites 51a and 51b are formed. Similarly, in the example shown in the same drawing, since each side E4 is a straight line, the line segment connecting both ends of one side E4 and the line segment connecting both ends of the other side E4 The relative distance is the same as the relative distance D4 of each side E4. However, each side E4 can also be a curved (arc) structure (the outer shape of the cut surface Sc1 is an approximately octagonal structure). The relative distance between the line segment at the two ends of one side of each side E4 and the line segment connecting the two ends of the other side of each side E4 is set as the relative distance D4, and the relative distance D4 is greater than the relative distances D1 and D2 (100/√ 2) Each of the distal end side portions 51a and 51b is formed so as to be within a range of 110% or less of the relative distances D1 and D2.

In addition, in this clamp sensor 202 as well, as shown in FIG. 7 , the sensor housings 10a, 10b constituting the housings of the clamp arms 11a, 11b are formed so that each of the sensor housings 10a, 10b corresponding to the respective distal end side portions 51a, 51b is formed. The thickness T of the portion (hereinafter, also referred to as "the portion on the front end portion side of the sensor housings 10a and 10b") is uniform (or substantially uniform) when viewed at the cutting plane Sc1.

In addition, in this clamp sensor 202 as well, as shown in FIG. 6 , each of the clamp arms 11 a and 11 b is formed such that the proximal end side portions 52 a and 52 b of the clamp arms 11 a and 11 b are formed to have a substantially rectangular cross section. and the outer shape area Sa2 of the cut surface Sc2 of the proximal end side parts 52a, 52b is larger than the outer shape area Sa1 of the cut surface Sc1 of the distal end part side parts 51a, 51b (the area Sa1 is smaller than the area Sa2).

Also, in this clamp sensor 202, as shown in FIG. 8, the opposing surfaces 101 constituting the outer peripheral surface of the annular body 100 at the distal end portions 21a, 21b of the clamp arms 11a, 11b are formed so as to be in the annular shape. In the formed state of the body 100 , the body 100 is a plane orthogonal to the direction connecting the top portion 100 a and the base end portion 100 b of the annular body 100 . As described above, in this clamp sensor 202, each of the clamp arms 11a, 11b is formed such that the relative distance D1a of the respective opposing surfaces 101 at the distal end portions 21a, 21b is larger than the distance D1a of the clamp arms 11a, 11b excluding the distal end portion 21a The relative distance D1b of each opposing surface 101 at other locations than 21b is short. Therefore, in this clamp sensor 202, the length of the annular body 100 in the direction connecting the top portion 100a and the base end portion 100b is shortened correspondingly to the shortening of the relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b. .

Here, as shown by the dashed line in FIG. 7 , in the conventional structure formed so that the outer shape of the cross-section plane Sc1 at each of the distal end side portions 51a and 51b of the clamp arms 11a and 11b is a quadrangle (not shown). In the structure in which the corners of the quadrangular prism are chamfered), the outer shape of the cut surface Sc1, that is, the distance between the opposite corners of the quadrilateral (diagonal distance D5 shown in the same drawing) is the relative distance of each side E1 The relative distance D2 between D1 and each side E2 is about 141% (in the case where the cut surface Sc1 is a square). Therefore, in the conventional structure, as shown in FIG. 11, when the gap G1 between the conductors 400a and 400b and the gap G2 between the conductors 400a and 400c are narrow, when the clamp meter 1 is inclined, it is difficult to clamp the clamp The front end portions 21a and 21b of the tightening arms 11a and 11b are inserted into the respective gaps G1 and G2.

On the other hand, in the clamp sensor 202 and the clamp meter 1 including the clamp sensor 202 , as described above, the respective distal end side portions 51 a and 51 b of the clamp arms 11 a and 11 b are formed so as to form a cut surface. The relative distance D3 of each side E3 among the sides of the outer shape of Sc1 (in this example, an octagon or a nearly octagon) (or a line segment connecting both ends of one side of each side E3 and a line connecting each side E3 The relative distance D3 of the line segments at the two ends of the other side of the The relative distance D4) of the line segment is greater than (100/√2)% of the relative distance D1 of each side E1 and the relative distance D2 of each side E2 and is 110% of the relative distance D1 of each side E1 and the relative distance D2 of each side E2 % or less. Therefore, according to the clamp sensor 202 and the clamp meter 1, the relative distances D3 and D4 can be made sufficiently shorter than the diagonal distance D5 of the cut surface Sc1 in the conventional structure, and therefore, compared with the conventional structure, the The tip portions 21a and 21b of the clamp arms 11a and 11b are easily inserted into the narrow gaps G1 and G2 with the clamp meter 1 tilted (see FIGS. 10 to 12 ). Therefore, according to the clamp sensor 202 and the clamp meter 1, even when there are other conductors 400 or obstacles near the conductor 400 to be clamped, the conductor 400 to be clamped can be clamped reliably.

In addition, according to the clamp sensor 202 and the clamp meter 1, the relative distances D3 and D4 (or a line segment connecting both ends of one side of each side E3 and both ends of the other side of each side E3) The relative distance D3 of the line segment, and the relative distance D4 of the line segment connecting the two ends of one side of each side E4 and the line segment connecting the two ends of the other side of each side E4) are greater than the relative distances D2, D3. The respective distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so as to be (100/√2)% and within the range of 110% or less of the relative distances D2 and D3, so that the relative distances D3, D3, Both D4 are sufficiently shorter than the diagonal distance D5 of the cutting plane Sc1 in the conventional structure. Therefore, according to the clamp sensor 202 and the clamp meter 1, for example, even when the clamp meter 1 is rotated in either the right-handed or left-handed rotation direction about the longitudinal direction of the clamp meter 1 as an axis to be tilted Even in this state, the front end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2.

In addition, in the clamp sensor 202 and the clamp meter 1, the thickness T of the portion on the distal end side of each sensor case 10a, 10b constituting the housing of each clamp arm 11a, 11b is observed at the cut surface Sc1 Since the clamp arms 11a and 11b are formed so as to be uniform (or substantially uniform) in the state, the sensor housings 10a and 10b can be prevented from having uneven thicknesses T in the front end side of the sensor housings 10a and 10b. 10a and 10b, where the thickness T is thin, the stress is concentrated to increase the strength of the sensor housings 10a and 10b. Therefore, it is possible to reliably prevent the sensor housings 10a and 10b from being damaged when a load is applied to the sensor housings 10a and 10b. damaged.

In addition, in the clamp sensor 202 and the clamp meter 1, each clamp is formed so that the area of the cut surface Sc2 of the proximal end side parts 52a, 52b is larger than the area of the cut surface Sc1 of the distal end part side parts 51a, 51b The arms 11a and 11b are thus formed such that the area of the cross-sectional surface Sc1 of the distal-end side parts 51a and 51b is the same as the area of the cross-sectional surface Sc2 of the proximal-end part-side parts 52a and 52b. Compared with the structure, the strength of the clamp arms 11a and 11b can be sufficiently improved.

In addition, in this clamp sensor 202, as described above, the area Sa1 of the outer shape of the cut surface Sc1 of the distal end side parts 51a, 51b is smaller than the area Sa2 of the outer shape of the cut surface Sc2 of the base end part side parts 52a, 52b The clamp arms 11a and 11b are formed in such a way (see FIG. 6 ). Therefore, according to the clamp sensor 202 , similarly to the clamp sensor 2 , the distal ends 21 a and 21 b of the clamp arms 11 a and 11 b can be easily inserted into the clamp arms 11 a and 11 b without reducing the strength of the clamp arms 11 a and 11 b. The inner side of the narrow gaps G1 and G2 between the adjacent conductors 400 . Therefore, according to this clamp sensor 202, the conductor 400 can be clamped reliably.

In addition, in this clamp sensor 202 , as shown in FIG. 8 , the length L103 along the straight line H1 between the position P and the facing surface 101 on the outer side of the annular body 100 is in the range of 9 mm or more and 11 mm or less. The clamping arms 11a, 11b are formed in a manner in which the position P is separated from the center of the top portion 100a by 15 mm along a direction orthogonal to the straight line H1 and parallel to the opening face F of the annular body 100. Therefore, according to the clamp sensor 202 , similarly to the clamp sensor 2 , the detection characteristics of the magnetic field can be maintained favorably, and the conductor 400 can be clamped more reliably.

Also, in this clamp sensor 202 , as shown in FIG. 9 , the clamp arms 11 a and 11 b are formed as: a straight line between any two points in the outer shape of the cut surface Sc1 at the distal end side parts 51 a and 51 b The longest distance among the distances is the relative distance D1 (see also FIG. 7 ), and the distance between the respective end portions 21 a and 21 b in a state in which the respective front end portions 21 a and 21 b of the respective clamp arms 11 a and 11 b are most separated from each other The distance is set as the separation distance D102, and at this time, the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 or more and 1/5 or less. Therefore, according to this clamp sensor 202 , like the clamp sensor 2 , the distal ends 21 a and 21 b can be easily inserted into the narrow space between the adjacent conductors 400 while the lever 30 a is pushed in to the maximum extent. Therefore, the handling performance can be sufficiently improved, and only one conductor of the plurality of conductors 400 can be clamped more reliably.

In addition, in the clamp sensor 202 and the clamp meter 1, the clamp arms 11a and 11b are formed such that the opposing surfaces 101 on the outer peripheral side of the distal end portions 21a and 21b of the clamp arms 11a and 11b are formed. The relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b is a plane that is orthogonal to the direction connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100 when the annular body 100 is formed. The distance D1b is shorter than the relative distance D1b between the opposing surfaces 101 of the clamp arms 11a and 11b other than the front end parts 21a and 21b, so that the front end parts 21a and 21b of the clamp arms 11a and 11b can be easily moved. inserted into the narrower gaps G1 and G2. In addition, since the relative distance D1a between the opposing surfaces 101 at the front end portions 21a and 21b is short, for example, even if there is an obstacle such as a wall behind the conductor 400 to be clamped, the distance between the conductor 400 and the obstacle is still relatively short. Even when the gap is narrow, it is possible to prevent an obstacle from coming into contact with each of the clamp arms 11a and 11b, and to clamp the conductor 400 to be clamped reliably.

In addition, in this clamp sensor 202, the base end side parts 52a and 52b of the clamp arms 11a and 11b may be formed in the same shape as the distal end part side parts 51a and 51b. In addition, in this clamp sensor 202 , it is also possible to adopt a configuration in which the sides E1 and E2 of the octagon, which is the outer shape of the cut surface Sc1 , have different lengths, and the sides E3 and E4 have different lengths. In addition, in this clamp sensor 202, the relative distances D1 and D2 may be set as different distances, and the relative distances D3 and D4 may be set as different distances. In addition, in the clamp sensor 202, only one of the relative distances D3 and D4 may be set to be within (100/ Each tip portion side portion 51a, 51b is configured to be within a range of 110% or less of relative distances D1, D2 (whichever is shorter among relative distances D1, D2) √2)%. In addition, in the clamp sensor 202, the respective distal end side portions 51a and 51b and the respective proximal end portion side portions of the respective clamp arms 11a and 11b may be formed such that the sides E3 and E4 are formed in a curved (arc) shape. The structures of both 52a and 52b. In addition, in this clamp sensor 202, it is also possible to adopt a configuration in which a part of the outer peripheral side of the top part 100a of the annular body 100 (the part shown by the dotted line in FIG. 8) is not cut out.

In addition, the clamp sensor 302 shown in FIG. 7 may also be used. In this clamp sensor 302, like the clamp sensor 2 described above, each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b has a pair of opposing surfaces 101, a pair of opposing surfaces 102, a pair of opposing surfaces 103 and a pair of opposing surfaces 104, as shown in the same drawing, each of the front end side portions 51a, 51b of the clamp arms 11a, 11b is formed as a cut surface Sc1 orthogonal to the longitudinal direction of the clamp arms 11a, 11b The outer shape is, for example, an octagonal (approximately octagonal) shape (an octagonal prism formed by chamfering the corners of the quadrangular prism indicated by the dotted line in the same drawing).

In addition, in this clamp sensor 302, as shown in FIG. 5, similarly to the clamp sensor 2 described above, the parts between the boundary surface Sb1 and the front end parts 21a and 21b are defined as the front end part side parts 51a and 51b, In addition, the portion between the boundary surface Sb1 and the proximal end portions 22a and 22b is defined as the proximal end portion side portions 52a and 52b, wherein the boundary surface Sb1 passes through the length of the center of the centroid C1 defined on the straight line H1. The predetermined point P101 within the range of L101 is orthogonal to the straight line H1. In addition, as shown in FIG. 13 , similarly to the clamp sensor 2A described above, a configuration may be adopted in which the positions between the boundary surface Sb2 and the distal end portions 21a and 21b are defined as the distal end portion side portions 51a and 51b, and the boundary surface The portions between Sb2 and the proximal end portions 22a and 22b are defined as proximal end portion side portions 52a and 52b, wherein the boundary surface Sb2 passes through the range of the length L101A defined on the straight line H2 centered on the centroid C2 The predetermined point P101A is orthogonal to the straight line H2.

In addition, in this clamp sensor 302, as shown in FIG. 7 , the portions other than the distal end portions 21a, 21b of the respective distal end portion side portions 51a, 51b of the clamp arms 11a, 11b are formed such that the outer shape of the cut surface Sc1 is Among the sides of the octagon, each side E1 corresponding to each opposing surface 101 and each side E2 corresponding to each opposing surface 102 have the same length L1, and each side E3 corresponding to each opposing surface 103 and each opposing surface have the same length L1. Each side E4 corresponding to 104 has the same length L2. In addition, in this clamp sensor 302, the respective distal end side portions 51a and 51b are formed such that the length L2 of the sides E3 and E4 is the shortest length of the lengths L1 of the sides E1 and E2 (the shortest of the lengths of the sides E1 and E2). ) in the range of 57% or more and less than 1000% (106% as an example).

In this case, in the structure in which the length L2 is set to be 1000% or more of the length L1, the shape of the cut surface Sc1 is formed into a thin shape (longitudinal or laterally long shape), and the core body is formed accordingly. 41 is also thin, and therefore, the magnetic properties may be deteriorated, and the detection accuracy of the detected amount may be lowered. On the other hand, in the structure in which the length L2 is set to be less than 57% of the length L1, it is difficult to sufficiently exert the effect described later by chamfering the corners of the quadrangular prism to increase the length L2 to a certain extent. . Therefore, in this clamp sensor 2, in order to maintain the detection accuracy of the detected amount with high accuracy and to sufficiently exert the effect obtained by increasing the length L2 to a certain extent, a method of setting the length L2 to the length L1 is adopted. A structure in the range of 57% or more and less than 1000%.

In addition, in the example shown in FIG. 7 , since the sides E3 and E4 are respectively straight lines, the length of the line segment connecting the two ends of E3 and E4 is the same as the length of the sides E3 and E4. However, it is also possible to use The sides E3 and E4 are curved (arc-shaped) structures (the outer shape of the cut surface Sc1 is an approximately octagonal structure), and in this structure, the length of the line segment connecting the respective ends of the sides E3 and E4 is defined as the length. The tip portion side parts 51a and 51b are formed so that the length L2 is within the range of 57% or more and less than 1000% of the length L1 (the shortest length of the lengths of the sides E1 and E2).

In addition, in this clamp sensor 302 as well, as shown in FIG. 7 , the sensor housings 10a, 10b constituting the housings of the clamp arms 11a, 11b are formed so that each of the sensor housings 10a, 10b corresponding to the respective distal end side portions 51a, 51b is formed. The thickness T of the portion (hereinafter, also referred to as "the portion on the front end portion side of the sensor housings 10a and 10b") is uniform (or substantially uniform) when viewed at the cutting plane Sc1.

In addition, in this clamp sensor 302, the proximal end side portions 52a, 52b of the clamp arms 11a, 11b may be formed to have a substantially rectangular cross-section and the area of the cut surface Sc2 of the proximal end portion side portions 52a, 52b may be formed Each of the clamp arms 11a and 11b is formed so as to be larger than the area of the cross-sectional surface Sc1 of the distal end side portions 51a and 51b (the area Sa1 is smaller than the area Sa2).

In addition, in this clamp sensor 302 as well, as shown in FIG. 8 , the opposing surfaces 101 of the distal end portions 21a and 21b of the clamp arms 11a and 11b, which constitute the outer peripheral surface of the annular body 100, are formed on the annular body. In the formed state of the annular body 100 , it is a plane perpendicular to the direction connecting the top portion 100 a and the base end portion 100 b of the annular body 100 . As described above, in this clamp sensor 302, the clamp arms 11a and 11b are formed such that the relative distance D1a between the opposing surfaces 101 at the front end portions 21a and 21b is greater than the distance D1a of the clamp arms 11a and 11b excluding the front end portion 21a. The relative distance D1b of each opposing surface 101 at other locations than 21b is short. Therefore, in this clamp sensor 302, the length of the annular body 100 in the direction connecting the top portion 100a and the base end portion 100b is shortened corresponding to the shortening of the relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b. .

Here, as shown by the dotted line in FIG. 7 , the outer shape of the cut surface Sc1 at each of the front end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a conventional quadrilateral structure (the corners of the quadrangular prism are not aligned with each other). In the structure with chamfered parts), the outer shape of the cut surface Sc1, that is, the distance between the opposite corners of the quadrilateral (diagonal distance D5 shown in the same drawing) is greater than the relative distance D1 of each side E1 and each side E2 The relative distance D2 is long. Therefore, in the conventional structure, as shown in FIG. 11, when the gap G1 between the conductors 400a and 400b and the gap G2 between the conductors 400a and 400c are narrow, when the clamp meter 1 is inclined, it is difficult to clamp the clamp The front end portions 21a and 21b of the tightening arms 11a and 11b are inserted into the respective gaps G1 and G2.

On the other hand, in the clamp sensor 302 and the clamp meter 1 including the clamp sensor 302, as described above, the respective distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so as to form a pair of quadrangular prisms. Length L2 of each side E3, E4 (or, connecting side E3, The length L2) of the line segment of each both ends of E4 is in the range of 57% or more and less than 1000% of the length L1 of each side E1 and E2. Therefore, according to the clamp sensor 302 and the clamp meter 1, by increasing the length L2 to a certain extent, the relative distances D3 and D4 can be made sufficiently shorter than the relative distance D5 of the cutting surface Sc1 in the conventional configuration. Therefore, Compared with the conventional structure, the tip portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 with the clamp meter 1 inclined (see FIGS. 10 to 12 ). Therefore, according to the clamp sensor 302 and the clamp meter 1, even when there are other conductors 400 or obstacles in the vicinity of the conductor 400 to be clamped, the conductor 400 to be clamped can be clamped reliably.

In addition, according to the clamp sensor 302 and the clamp meter 1, the distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed to have the entire length L2 of the sides E3, E4 (or the length L2 of the connecting sides E3, E4). The lengths L2) of all the line segments at the respective both ends are in the range of 57% or more and less than 1000% of the lengths L1 of the sides E1 and E2. Therefore, both the relative distances D3 and D4 can be made sufficiently shorter than the conventional structure. The relative distance D5 of the cutting plane Sc1. Therefore, according to the clamp sensor 302 and the clamp meter 1, for example, even when the clamp meter 1 is rotated in either the right-handed or left-handed rotation direction about the longitudinal direction of the clamp meter 1 as an axis to be tilted Even in this state, the front end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2.

In addition, in the clamp sensor 302 and the clamp meter 1, the thickness T of the portion on the distal end side of each sensor case 10a, 10b constituting the housing of each clamp arm 11a, 11b is viewed at the cut surface Sc1 The clamp arms 11a and 11b are formed so as to be uniform (or substantially uniform) in the state, so that the sensor case can be avoided compared with a structure in which the thickness T of the portion on the front end portion side of the sensor case 10a and 10b is not uniform. The strength of the sensor housings 10a and 10b is increased by concentrating the stress in the parts where the thickness T of the bodies 10a and 10b is thin, so that the sensor housings 10a and 10b can be reliably prevented from being subjected to a load when the sensor housings 10a and 10b are loaded. of damage.

In addition, in the clamp sensor 302 and the clamp meter 1, each clamp is formed such that the area of the cut surface Sc2 of the proximal end side parts 52a, 52b is larger than the area of the cut surface Sc1 of the distal end part side parts 51a, 51b The arms 11a and 11b are thus formed such that the area of the cross-sectional surface Sc1 of the distal-end side parts 51a and 51b is the same as the area of the cross-sectional surface Sc2 of the proximal-end part-side parts 52a and 52b. Compared with the structure, the strength of the clamp arms 11a and 11b can be sufficiently improved.

In addition, in this clamp sensor 302, as described above, the area Sa1 of the outer shape of the cut surface Sc1 at the distal end side parts 51a, 51b is smaller than the area of the outer shape of the cut surface Sc2 at the base end part side parts 52a, 52b. The clamp arms 11a and 11b are formed in the manner of Sa2 (see FIG. 6 ). Therefore, according to this clamp sensor 302 , similarly to the clamp sensor 2 , the distal ends 21 a and 21 b of the clamp arms 11 a and 11 b can be easily inserted into the clamp arms 11 a and 11 b without reducing the strength of the clamp arms 11 a and 11 b. The inner side of the narrow gaps G1 and G2 between the adjacent conductors 400 . Therefore, according to this clamp sensor 302, the conductor 400 can be clamped reliably.

In addition, in this clamp sensor 302 , as shown in FIG. 8 , the length L103 along the straight line H1 between the position P and the facing surface 101 on the outer side of the annular body 100 is in the range of 9 mm or more and 11 mm or less. The clamping arms 11a, 11b were formed in a manner in which the position P was separated from the center of the top 100a by 15 mm along a direction orthogonal to the straight line H1 and parallel to the opening face F of the annular body 100. Therefore, according to the clamp sensor 302 , similarly to the clamp sensor 2 , the detection characteristics of the magnetic field can be maintained favorably, and the conductor 400 can be clamped more reliably.

Also, in this clamp sensor 302, as shown in FIG. 9, the clamp arms 11a and 11b are formed so that: a straight line between any two points in the outer shape of the cut surface Sc1 at the distal end side parts 51a and 51b is formed. The longest distance among the distances is the relative distance D1 (see also FIG. 7 ), and the distance between the respective end portions 21 a and 21 b in a state in which the respective front end portions 21 a and 21 b of the respective clamp arms 11 a and 11 b are most separated from each other The distance is set as the separation distance D102, and at this time, the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 or more and 1/5 or less. Therefore, according to this clamp sensor 302 , similarly to the clamp sensor 2 , the distal ends 21 a and 21 b can be easily inserted into the narrow space between the adjacent conductors 400 while the lever 30 a is pushed in to the maximum extent. Therefore, the handling performance can be sufficiently improved, and only one conductor of the plurality of conductors 400 can be clamped more reliably.

In addition, in the clamp sensor 302 and the clamp meter 1, the clamp arms 11a and 11b are formed such that the opposing surfaces 101 on the outer peripheral side of the distal end portions 21a and 21b of the clamp arms 11a and 11b are formed. The relative distance D1a between the opposing surfaces 101 at the distal end portions 21a and 21b is a plane that is orthogonal to the direction connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100 when the annular body 100 is formed. The distance D1b is shorter than the relative distance D1b between the opposing surfaces 101 of the clamp arms 11a and 11b other than the front end parts 21a and 21b, so that the front end parts 21a and 21b of the clamp arms 11a and 11b can be easily moved. inserted into the narrower gaps G1 and G2. In addition, since the relative distance D1a between the opposing surfaces 101 at the front end portions 21a and 21b is short, for example, even if there is an obstacle such as a wall behind the conductor 400 to be clamped, the distance between the conductor 400 and the obstacle is still relatively short. Even when the gap is narrow, it is possible to prevent an obstacle from coming into contact with each of the clamp arms 11a and 11b, and to clamp the conductor 400 to be clamped reliably.

In addition, in this clamp sensor 302, the base end side parts 52a, 52b of the clamp arms 11a, 11b may be formed in the same shape as the distal end part side parts 51a, 51b. In addition, in the clamp sensor 302 , a configuration may be adopted in which the sides E1 and E2 of the octagon, which is the outer shape of the cut surface Sc1 , have different lengths and the sides E3 and E4 have different lengths. In addition, in this clamp sensor 302, the condition that the length of at least one of the sides E3 and E4 is within the range of 57% or more and less than 100% of the shortest length of the lengths of the sides E1 and E2 is satisfied. , the lengths of the sides E1, E2, E3, and E4 can be arbitrarily defined. In addition, in the clamp sensor 302, the respective distal end side portions 51a and 51b and the respective proximal end portions of the respective clamp arms 11a and 11b may be formed such that the sides E3 and E4 are formed in a curved (arc) shape. The structure of both the parts 52a and 52b. In addition, in this clamp sensor 302, a structure in which a part of the outer peripheral side of the top part 100a of the annular body 100 (the part shown by the broken line in FIG. 8) may not be cut off may be adopted.

In addition, the example in which the front end side parts 51a and 51b are formed so that the outer shape of the cut surface Sc1 of the front end part side parts 51a and 51b of the clamp arms 11a and 11b is substantially octagonal has been described above. However, it is also possible to adopt a configuration in which the front end portion side parts 51a and 51b are formed such that the outer shape of the cut surface Sc1 is formed into a polygonal shape other than a substantially octagonal shape (for example, a substantially dodecagonal shape or a substantially hexagonal shape). . As an example, the clamp sensor 402 shown in FIG. 14 can be used.

In this clamp sensor 402, each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b has a pair of opposing surfaces 101 corresponding to the first opposing surface, a pair of opposing surfaces 102 corresponding to the second opposing surface, A pair of opposing surfaces 103a, a pair of opposing surfaces 103b, a pair of opposing surfaces 104a, and a pair of opposing surfaces 104b inclined with respect to the opposing surfaces 101 and 102 (all correspond to the third opposing surface, and as an example of a plurality of pairs, there are four in total). With respect to the third opposing surface), the front end side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the outer shape of the cross-section plane Sc1 perpendicular to the longitudinal direction of the clamp arms 11a and 11b is substantially dodecagonal. . In addition, since the cross-sectional shapes of the respective front-end side parts 51a and 51b are the same, in the same drawings, only the cross-sectional shape of the front-end part-side part 51a is shown, and the figure of the cross-sectional shape of the front-end part-side part 51b is omitted. Show.

In addition, in this clamp sensor 402, as shown in FIG. 14, the portions other than the distal end portions 21a, 21b of the respective distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed such that the outer shape of the cut surface Sc1 is Among the sides of the dodecagon, each side E1 corresponding to each facing surface 101 and each side E2 corresponding to each facing surface 102 have the same length L1, and each side E3a, E3b corresponding to each facing surface 103a, 103b has the same length L1 (the length of the line segment connecting the respective ends of the sides E3a, E3b) and the length of the respective sides E4a, E4b corresponding to the opposing faces 104a, 104b (the line segment connecting the respective ends of the sides E4a, E4b) length) is the same length as L2. In addition, in this clamp sensor 402, each of the distal end side parts 51a and 51b is formed so that the length L2 is longer than the length L1 (the shortest length among the lengths of the sides E1 and E2).

In addition, in this clamp sensor 402 as well, as shown in FIG. 14 , each sensor case 10a, 10b constituting the housing of each clamp arm 11a, 11b is formed so as to correspond to each distal end side portion 51a, 51b The thickness T of each part (hereinafter, also referred to as "the part on the front end portion side of the sensor housings 10a and 10b") is uniform (or substantially uniform) when viewed at the cutting plane Sc1. Therefore, in the clamp sensor 402, compared with a structure in which the thickness T of the portion on the distal end side of the sensor housings 10a and 10b is not uniform, it is possible to avoid the part where the thickness T of the sensor housings 10a and 10b is thin. The stress is concentrated and the strength of the sensor housings 10a and 10b can be increased. Therefore, the sensor housings 10a and 10b can be reliably prevented from being damaged when a load is applied to the sensor housings 10a and 10b.

In addition, in this clamp sensor 402, as shown in FIG. 14, each front end portion side portion 51a, 51b may be formed such that the outer shape of the cut surface Sc1, that is, the relative distance D1 of each side E1 of a dodecagon, and each side The relative distance D2 of E2 is the same distance, the relative distance D3a, D3b of each side E3a, E3b (the line segment connecting the two ends of one side of each side E3a, E3b and the two sides connecting the other side of each side E3a, E3b The relative distance of the line segments at the ends) and the relative distances D4a, D4b of each side E4a, E4b (the line segment connecting the two ends of one of the sides E4a, E4b and the two ends connecting the other side of the sides E4a, E4b The relative distances of the line segments of the parts) are the same distance, and the relative distances D3a, D3b, D4a, D4b are greater than (100/√2)% of the relative distances D1, D2 (whichever is the shorter of the relative distances D1, D2) and It is 110% or less (99% as an example) of the relative distances D1 and D2 (whichever is shorter among the relative distances D1 and D2), and in this case, the above-mentioned effects can be achieved.

In addition, in this clamp sensor 402, as shown in FIG. 14, the outer shape of the cut surface Sc1, that is, the length L2 of each side E3a, E3b, E4a, E4b of the dodecagon, may be the same as the length L2 of each side E1, E2 Each of the front end side portions 51a and 51b is formed so as to be within a range of not less than 57% and less than 1000% (106% as an example) of L1 (the shortest length among the lengths of the sides E1 and E2). In this case, The above-described effects can also be achieved.

In addition, it is also applicable when there are three or five or more pairs of third opposing surfaces inclined with respect to the first opposing surface and the second opposing surface and the number of pairs (number of sets) of a pair of third opposing surfaces is set to n. The outer shape of the cut surface Sc1 is formed into various polygonal structures that approximate a (4+2n) polygon (n is a natural number of 2 or more). Even in this case, the above-described effects can be achieved.

In addition, it is also possible to adopt a configuration in which the distal end portion side portions 51a and 51b are formed in a shape in which a part of the outer shape of the cut surface Sc1 is formed by a curved line. As an example, the clamp sensor 502 shown in FIG. 15 can be used. In addition, since the cross-sectional shapes of the respective front-end side parts 51a and 51b are the same, in the same drawings, only the cross-sectional shape of the front-end part-side part 51a is shown, and the figure of the cross-sectional shape of the front-end part-side part 51b is omitted. Show.

In this clamp sensor 502, as shown in FIG. 15, each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b has a pair of opposing surfaces 101 (equivalent to the outer peripheral surface and the inner peripheral surface of the annular body 100) On the first opposing surface) and a pair of opposing surfaces 102 (corresponding to the second opposing surface) constituting both side surfaces of the annular body 100, the respective front end side portions 51a and 51b of the clamp arms 11a and 11b are formed so as to align with the clamp arms 11a and 11b. The outer shape of the cross-section plane Sc1 perpendicular to the longitudinal directions of the tightening arms 11a and 11b is such that both ends of the ellipse in the longitudinal direction are cut in the direction perpendicular to the opening surface F of the annular body 100 (the left-right direction in the same drawing). formed shape. In addition, in the clamp sensor 502, among the sides constituting the outer shape of the cut surface Sc1, each side E1 corresponding to each opposing surface 101 is formed as a straight line, and each side E2 corresponding to each opposing surface 102 is formed as a straight line. A curve curved outward (a shape obtained by chamfering the corners of the quadrangular prism shown by the dotted line in the same drawing). In addition, in this clamp sensor 502, the clamp is formed so that the longest relative distance D6 of each side E2 along the direction perpendicular to the opening surface F of the annular body 100 is equal to or less than the relative distance D1 of each side E1 The respective distal end side portions 51a and 51b of the tightening arms 11a and 11b. In this clamp sensor 502, the respective distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed as described above, so that the longest relative distance D7, D8 is configured to be equal to or less than the relative distance D1 of each side E1. In addition, in the same drawing, the example in which the relative distance D1 is equal to the relative distances D7 and D8 is illustrated.

In addition, in this clamp sensor 502 as well, as shown in FIG. 15 , the sensor housings 10a, 10b constituting the housings of the clamp arms 11a, 11b are formed so that each of the sensor housings 10a, 10b corresponding to the respective distal end side portions 51a, 51b is formed. The thickness T of the portion (hereinafter, also referred to as "the portion on the front end portion side of the sensor housings 10a and 10b") is uniform (or substantially uniform) when viewed at the cutting plane Sc1.

According to the clamp sensor 502 and the clamp meter 1 including the clamp sensor 502 , each side E1 of the sides constituting the outer shape of the cut surface Sc1 is formed as a straight line and each side E2 is formed as a curved line curved toward the outside By forming the front end side portions 51a and 51b of the clamp arms 11a and 11b so that the longest relative distances D7 and D8 of the respective sides E2 can be set to be equal to or smaller than the relative distance D1 of the respective sides E1 The outer shape of the cut surface Sc1 of each of the front end side portions 51a and 51b of 11a and 11b is formed into a quadrangle, and the diagonal distance D5 of the cut surface Sc1 is larger than the relative distance D1 of each side E1 and the longest relative distance D7 of each side E2, Compared with the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered) formed in such a way that D8 is long, the front ends 21a, 21a, 21b is easily inserted into the narrow gaps G1, G2. Therefore, according to the clamp sensor 502 and the clamp meter 1, even when there are other conductors 400 or obstacles near the conductor 400 to be clamped, the conductor 400 to be clamped can be clamped reliably.

In addition, in the clamp sensor 502 and the clamp meter 1 including the clamp sensor 502, the longest relative distance D6 of each side E2 along the direction perpendicular to the opening surface F of the annular body 100 is defined as each The front-end|tip part side parts 51a and 51b of each clamp arm 11a, 11b are formed so that the relative distance D1 of the side E1 may be less or less. Therefore, according to the clamp sensor 502 and the clamp meter 1, by inclining the clamp meter 1 so that the inclination angle of the opening surface F of the annular body 100 with respect to the extending direction of the conductor 400 becomes smaller, the clamp The front end portions 21a, 21b of the tightening arms 11a, 11b are more easily inserted into the narrow gaps G1, G2.

Further, according to the clamp sensor 502 and the clamp meter 1 including the clamp sensor 502, the thickness T of the portion on the distal end side of the sensor housings 10a, 10b constituting the housing of the clamp arms 11a, 11b is The clamping arms 11a and 11b are formed so as to be uniform (or substantially uniform) when viewed from the cutting plane Sc1, and compared with a structure in which the thickness T of the portion on the front end portion side of the sensor housings 10a and 10b is not uniform, it is possible to The strength of the sensor housings 10a and 10b is improved by avoiding stress concentration in the portions where the thickness T of the sensor housings 10a and 10b is thin, so that the sensor housings 10a and 10b can be reliably prevented from being subjected to a load when a load is applied to the sensor housings 10a and 10b Breakage of 10a, 10b.

In addition, as another example of the configuration in which the distal end side portions 51a and 51b are formed in a shape in which a part of the external shape of the sectional surface Sc1 is curved, the clamp sensor 602 shown in FIG. 16 can be used. In addition, since the cross-sectional shapes of the respective front-end side parts 51a and 51b are the same, in the same drawings, only the cross-sectional shape of the front-end part-side part 51a is shown, and the figure of the cross-sectional shape of the front-end part-side part 51b is omitted. Show.

In this clamp sensor 602, as shown in FIG. 16, each of the distal end side portions 51a, 51b of the clamp arms 11a, 11b has a pair of opposing surfaces 101 (equivalent to the outer peripheral surface and the inner peripheral surface of the annular body 100) On the first opposing surface), a pair of opposing surfaces 102 (equivalent to the second opposing surface) constituting the two side surfaces of the annular body 100, and two pairs of opposing surfaces 105 (equivalent to the second opposing surface) located between the opposing surfaces 101 and 102 The front end side portions 51a and 51b of the clamp arms 11a and 11b are formed such that the cross-section plane Sc1 perpendicular to the longitudinal direction of the clamp arms 11a and 11b has an outer shape such that the corners of the quadrilaterals become A rounded (rounded) shape. In addition, in this clamp sensor 602, among the sides constituting the outer shape of the cut surface Sc1, each side E1 corresponding to each opposing surface 101 and each side E2 corresponding to each opposing surface 102 are formed in a straight line, and are formed with each side. Each side E5 corresponding to the opposing surface 105 is formed as a curve curved outward (a shape formed by chamfering each corner of a quadrangular prism shown by a dotted line in the same drawing into a curved surface). In addition, in this clamp sensor 602, the respective distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the relative distance D9 of the respective sides E2 is equal to or smaller than the relative distance D1 of the respective sides E1. In this clamp sensor 602, the distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed in the above-described manner so that the longest relative distance D10 of each of the opposing sides E5 is as shown in the same drawing. , D11 is configured to be less than or equal to the relative distance D1 of each side E1. In addition, in the same drawing, the example in which the relative distance D1 is equal to the relative distances D10 and D11 is illustrated.

In addition, in this clamp sensor 602, as shown in FIG. 16, the sensor housings 10a, 10b constituting the housings of the clamp arms 11a, 11b are formed so that each corresponding to the respective distal portion side parts 51a, 51b The thickness T of the portion (hereinafter, also referred to as "the portion on the front end portion side of the sensor housings 10a and 10b") is uniform (or substantially uniform) when viewed at the cutting plane Sc1.

According to the clamp sensor 602 and the clamp meter 1 including the clamp sensor 602 , the sides E1 and E2 of the sides constituting the outer shape of the cut surface Sc1 are formed as straight lines and the sides E5 are formed as curved lines curved outward. The front end side portions 51a and 51b of the clamp arms 11a and 11b are formed in such a way that the longest relative distances D10 and D11 of the opposite sides E5 can be set to be equal to or less than the relative distance D1 of the sides E1. The outer shape of the cut surface Sc1 of each of the front end side parts 51a and 51b of the clamp arms 11a and 11b is formed into a quadrangle, and the diagonal distance D5 of the cut surface Sc1 is larger than the relative distance D1 of each side E1 and the relative distance D9 of each side E2. Compared with the conventional structure formed in a long manner (the structure in which the corners of the quadrangular prism are not chamfered), the front ends 21a and 21b of the clamp arms 11a and 11b can be clamped in a state where the clamp meter 1 is inclined. Easily inserted into narrow gaps G1, G2. Therefore, according to the clamp sensor 602 and the clamp meter 1, even when there are other conductors 400 or obstacles near the conductor 400 to be clamped, the conductor 400 to be clamped can be clamped reliably.

In addition, in the clamp sensor 602 and the clamp meter 1 including the clamp sensor 602, the respective clamp arms 11a and 11b are formed so that the relative distance D9 of each side E2 is equal to or smaller than the relative distance D1 of each side E1. Each of the front end portion side sites 51a and 51b. Therefore, according to the clamp sensor 602 and the clamp meter 1, by inclining the clamp meter 1 so that the inclination angle of the opening surface F of the annular body 100 with respect to the extending direction of the conductor 400 is reduced, the clamp meter 1 can be clamped. The front end portions 21a, 21b of the tightening arms 11a, 11b are more easily inserted into the narrow gaps G1, G2.

Further, according to the clamp sensor 602 and the clamp meter 1 including the clamp sensor 602, the thickness T of the portion on the distal end side of the sensor housings 10a, 10b constituting the housing of the clamp arms 11a, 11b is The clamping arms 11a and 11b are formed so as to be uniform (or substantially uniform) when viewed from the cutting plane Sc1, and compared with a structure in which the thickness T of the portion on the front end portion side of the sensor housings 10a and 10b is not uniform, it is possible to The strength of the sensor housings 10a and 10b is improved by avoiding stress concentration in the portions where the thickness T of the sensor housings 10a and 10b is thin, so that the sensor housings 10a and 10b can be reliably prevented from being subjected to a load when a load is applied to the sensor housings 10a and 10b Breakage of 10a, 10b.

In addition, the example in which the clamp arm 11b (one of the clamp arms 11a and 11b) is configured to be rotatable has been described above, but the clamp arm 11a may be configured to be rotatable, or the clamp arm Both 11a and 11b are configured to be rotatable.

industrial availability

According to the present invention, each tip portion of each clamp arm can be easily inserted into a narrow gap while the measuring device is tilted. Therefore, for example, even when there are other conductors or obstacles in the vicinity of the conductor to be clamped In this case, the conductor to be clamped can also be clamped reliably. Therefore, it can be widely applied to a clamp sensor that detects the measured amount of the clamping object and a measuring device that measures the measured amount of the clamping object.

Symbol Description

1 clamp meter;

2, 2A, 202, 302, 402, 502, 602 clamp sensor;

11a, 11b clamping arm;

21a, 21b front end;

22a, 22b base end;

23 rotating shaft;

33 Processing Department;

41 cores;

51a, 51b front end side part;

52a, 52b base end side part;

100 rings;

100a top;

400, 400a conductors;

101~105, 103a, 103b, 104a, 104b opposite surfaces;

C1, C2 center;

D1～D11 relative distance;

D102 separation distance;

Edges E1～E5, E3a, E3b, E4a, E4b;

H1, H2 straight line;

L1, L2 length;

L101, L101A, L102, L103 length;

Mc magnetic circuit;

P position;

P101, P101A specified points;

Sa1, Sa2 area;

Sb1, Sb2 boundary interface;

Sc1, Sc2 section plane;

T thickness.

Claims (18)

1. A clamp sensor including a pair of clamp arms each formed in a substantially arc shape in a plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close respective distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the respective distal end portions are closed, the clamp sensor being configured to be capable of detecting a detected amount of a clamping object in a state where the clamping object is clamped by the respective clamp arms,

it is characterized in that the preparation method is characterized in that,

each portion on the tip end portion side of each of the clamp arms has a pair of first facing surfaces that constitute an outer peripheral surface and an inner peripheral surface of the annular body, a pair of second facing surfaces that constitute both side surfaces of the annular body, and a plurality of pairs of third facing surfaces that are inclined with respect to each of the first facing surfaces and each of the second facing surfaces, and each portion on the tip end portion side of each of the clamp arms is formed such that: in each of the respective sides constituting the outer shape of the cross-section orthogonal to the longitudinal direction of each of the clamp arms, a length of a line segment connecting both end portions of at least one of the respective sides corresponding to the respective third opposing surfaces is longer than a shortest length among lengths of the respective sides corresponding to the respective first opposing surfaces and the respective second opposing surfaces.

2. The clamp sensor of claim 1,

each part of each of the clamp arms on the side of the front end portion is formed as follows: the length of each line segment connecting both end portions of each side corresponding to each third opposing surface is longer than the shortest one of the lengths of each side corresponding to each first opposing surface and each second opposing surface.

3. A clamp sensor including a pair of clamp arms each formed in a substantially arc shape in a plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close respective distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the respective distal end portions are closed, the clamp sensor being configured to be capable of detecting a detected amount of a clamping object in a state where the clamping object is clamped by the respective clamp arms,

it is characterized in that the preparation method is characterized in that,

each portion of each of the clamp arms on the side of the distal end portion has a pair of first opposing surfaces that form an outer peripheral surface and an inner peripheral surface of the annular body, a pair of second opposing surfaces that form both side surfaces of the annular body, and a plurality of pairs of third opposing surfaces that are inclined with respect to each of the first opposing surfaces and each of the second opposing surfaces, and each portion of each of the clamp arms on the side of the distal end portion is formed such that: in each of the lines constituting the outer shape of the cross-section orthogonal to the longitudinal direction of each of the clamp arms, a relative distance between a line segment connecting both end portions of one of the lines corresponding to each of the third opposing faces and opposing each other and a line segment connecting both end portions of the other of the lines is within the following range: greater than (100/√ 2)%, and less than 110% of any shorter distance of the relative distance of each of the sides corresponding to the first opposing faces and the relative distance of each of the sides corresponding to the second opposing faces.

4. The clamp sensor of claim 3,

each part of each of the clamp arms on the side of the front end portion is formed as follows: the relative distances of all combinations of the sides opposite to each other lie within the following ranges: greater than (100/√ 2)% of and less than 110% of any shorter distance of the relative distance of the sides corresponding to the first opposing faces and the relative distance of the sides corresponding to the second opposing faces.

5. A clamp sensor including a pair of clamp arms each formed in a substantially arc shape in a plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close respective distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the respective distal end portions are closed, the clamp sensor being configured to be capable of detecting a detected amount of a clamping object in a state where the clamping object is clamped by the respective clamp arms,

it is characterized in that the preparation method is characterized in that,

each portion on the tip end portion side of each of the clamp arms has a pair of first facing surfaces that constitute an outer peripheral surface and an inner peripheral surface of the annular body, a pair of second facing surfaces that constitute both side surfaces of the annular body, and a plurality of pairs of third facing surfaces that are inclined with respect to each of the first facing surfaces and each of the second facing surfaces, and each portion on the tip end portion side of each of the clamp arms is formed such that: the length of a line segment connecting both end portions of at least one of the respective sides corresponding to the third opposing surfaces among the respective sides constituting the outer shape of the cross-section orthogonal to the longitudinal direction of the respective clamp arms is within the following range: the length of the shortest side among the lengths of the sides corresponding to the first opposing surfaces and the second opposing surfaces is 57% or more and less than 1000% of the shortest length.

6. The clamp sensor of claim 5,

each part of each of the clamp arms on the side of the front end portion is formed as follows: the lengths of all line segments connecting both end portions of the sides respectively corresponding to the third opposing faces are within the following ranges: and 57% or more of the shortest length among the lengths of the sides corresponding to the first opposing faces and the second opposing faces, respectively, and less than 1000% of the shortest length.

7. A clamp sensor including a pair of clamp arms each formed in a substantially arc shape in a plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close respective distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the respective distal end portions are closed, the clamp sensor being configured to be capable of detecting a detected amount of a clamping object in a state where the clamping object is clamped by the respective clamp arms,

it is characterized in that the preparation method is characterized in that,

each portion of each of the clamp arms on the side of the distal end portion has a pair of first opposing surfaces that form an outer peripheral surface and an inner peripheral surface of the annular body, and a pair of second opposing surfaces that form both side surfaces of the annular body, and each portion of each of the clamp arms on the side of the distal end portion is formed such that: among the respective sides constituting the outer shape of the cross-section orthogonal to the longitudinal direction of each clamp arm, the respective sides corresponding to the first opposing surfaces are straight lines, and the respective sides corresponding to the second opposing surfaces are curved lines curved outward.

8. The clamp sensor of claim 7,

each part of each of the clamp arms on the side of the front end portion is formed as follows: the longest relative length of each side corresponding to each second opposing surface along a direction perpendicular to the opening surface of the annular body is equal to or less than the relative distance of each side corresponding to each first opposing surface.

9. A clamp sensor including a pair of clamp arms each formed in a substantially arc shape in a plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close respective distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the respective distal end portions are closed, the clamp sensor being configured to be capable of detecting a detected amount of a clamping object in a state where the clamping object is clamped by the respective clamp arms,

it is characterized in that the preparation method is characterized in that,

each portion on the tip end portion side of each of the clamp arms has a pair of first opposing surfaces that constitute an outer peripheral surface and an inner peripheral surface of the annular body, a pair of second opposing surfaces that constitute both side surfaces of the annular body, and two pairs of fourth opposing surfaces that are located between each of the first opposing surfaces and each of the second opposing surfaces, and each portion on the tip end portion side of each of the clamp arms is formed such that: among the respective sides constituting the outer shape of the cross-section orthogonal to the longitudinal direction of each clamp arm, the respective sides corresponding to the first opposing surfaces and the respective sides corresponding to the second opposing surfaces are straight lines, and the respective sides corresponding to the fourth opposing surfaces are curved lines curved outward.

10. The clamp sensor of claim 9,

each part of each of the clamp arms on the side of the front end portion is formed as follows: the relative distance between each side corresponding to each second opposing surface is equal to or less than the relative distance between each side corresponding to each first opposing surface.

11. The clamp sensor according to one of claims 1 to 10,

each of the clamp arms includes a sensor housing forming an outer shell of each of the clamp arms,

each of the sensor housings is formed such that: the thickness of each portion corresponding to the tip end portion side of each clamp arm is uniform or substantially uniform in a state viewed at the cutting plane.

12. The clamp sensor according to any one of claims 1 to 11,

each of the clamp arms is formed such that: the area of the cutting surface of each portion on the proximal end portion side of each clamp arm is larger than the area of the cutting surface of each portion on the distal end portion side.

13. The clamp sensor of claim 12,

each of the clamp arms includes a core that generates a magnetic field by a current flowing through the clamping object, and is formed such that: on a straight line passing through a center of a graph of a top portion of the annular body corresponding to each tip portion and a circular magnetic path formed by the core bodies in a formed state of the annular body, a plane passing through an arbitrary point within a range of a length corresponding to 40% of a linear distance from the top portion to the center of the graph and orthogonal to the straight line is set as a boundary surface, and an area of an outer shape of the cross-section at a portion between the boundary surface and the tip portion, which is each portion on the tip portion side, is smaller than an area of an outer shape of the cross-section at a portion between the boundary surface and the base portion, which is each portion on the base portion side.

14. The clamp sensor of claim 12,

each of the clamp arms is formed such that: on a straight line passing through a center of a figure of the annular body corresponding to each tip portion and a graph of the graph in a plan view of an inner periphery of the annular body, a plane passing through an arbitrary point within a range of a length corresponding to 40% of a linear distance from the top portion to the center of the figure and orthogonal to the straight line with the center of the figure as a boundary surface is set, and an area of an outer shape of the cross-sectional surface at a portion between the boundary surface and the tip portion of each portion on the tip portion side is smaller than an area of an outer shape of the cross-sectional surface at a portion between the boundary surface and the base portion of each portion on the base portion side.

15. The clamp sensor according to one of claims 1 to 14,

each of the clamp arms is formed such that: the first opposing surfaces constituting the outer peripheral surface of each of the distal end portions of each of the clamp arms are configured as one plane orthogonal to a direction connecting the distal end portion and the proximal end portion of the annular body in a state in which the annular body is formed, and a relative distance of each of the first opposing surfaces of each of the distal end portions of each of the clamp arms is shorter than a relative distance of each of the first opposing surfaces at a portion other than each of the distal end portions of each of the clamp arms.

16. The clamp sensor according to any one of claims 1 to 15,

each of the clamp arms is formed such that: a length along the straight line between a position separated by 15mm from the center of the top portion in a direction orthogonal to the straight line and parallel to an opening surface of the annular body and an outer peripheral surface of the annular body is in a range of 9mm to 11 mm.

17. The clamp sensor according to any one of claims 1 to 16,

each of the clamp arms is formed such that: the longest distance among linear distances between any two points in the outer shape of the cutting plane at a position between the boundary surface and the tip end portion side is within a range of 1/6 or more and 1/5 or less, which is a separation distance between the tip end portions of the clamp arms in a state where the tip end portions are maximally separated from each other.

18. An assay device, comprising:

the clamp sensor of any one of claims 1 to 17; and

and a measuring unit that measures a measured amount of the clamping object based on the detected amount detected by the clamp sensor.

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