CN111742230A - Clamp sensor and measuring device - Google Patents

Clamp sensor and measuring device Download PDF

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Publication number
CN111742230A
CN111742230A CN201980013947.7A CN201980013947A CN111742230A CN 111742230 A CN111742230 A CN 111742230A CN 201980013947 A CN201980013947 A CN 201980013947A CN 111742230 A CN111742230 A CN 111742230A
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China
Prior art keywords
clamp
clamp arms
sensor
distal end
end portions
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CN201980013947.7A
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CN111742230B (en
Inventor
中岛谦太郎
中村哲也
宫泽健明
安部裕介
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Hioki EE Corp
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Hioki Denki KK
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Priority claimed from PCT/JP2019/003597 external-priority patent/WO2019159718A1/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/186—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using current transformers with a core consisting of two or more parts, e.g. clamp-on type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/22—Tong testers acting as secondary windings of current transformers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Clamps And Clips (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

The clamping object is reliably clamped. The clamp comprises a pair of clamp arms (11a) which are respectively formed into an approximate arc shape in a plan view, at least one of the pair of clamp arms is configured to be capable of rotating to enable the front end parts to be opened and closed, so that an annular body is formed under the state that the front end parts are closed, each part (51a) of the front end part side of each clamp arm is provided with a pair of opposite surfaces (101) forming the outer peripheral surface and the inner peripheral surface of the annular body, a pair of opposite surfaces (102) forming two side surfaces of the annular body, a pair of opposite surfaces (103) inclined relative to the opposite surfaces (101, 102) and a pair of opposite surfaces (104) inclined relative to the opposite surfaces (101, 102), and each part of the front end part side of each clamp arm is formed: among the outer shapes of the cross-sectional surfaces (Sc1) perpendicular to the longitudinal direction of the clamp arms, the length (L2) of the sides (E3, E4) corresponding to the opposing surfaces (103, 104) is longer than the length (L1) of the sides (E1, E2) corresponding to the opposing surfaces (101, 102).

Description

Clamp sensor and measuring device
Technical Field
The present invention relates to a clamp sensor for detecting a measurement target amount of a clamped object in a state where the clamped object is clamped by a pair of clamp arms having a substantially arc shape in a plan view, and a measurement device including the clamp sensor for measuring the measurement target amount of the clamped object.
Background
As such a clamp sensor, a clamp sensor disclosed in patent document 1 given below by the applicant is known. The clamp sensor includes a movable sensor and a fixed sensor each formed in a substantially arc shape in plan view. In this case, the movable sensor is connected to be rotatable about the base end portion by inserting the base end portion through the connection pin. When the current flowing through the electric wire is detected using the clamp sensor, for example, a lever provided at the base end portion of the movable sensor is gripped. At this time, the movable side sensors rotate, and the tip end portions of the sensors are separated from each other. Then, the electric wire is passed through the divided portion, and then the grip state of the lever is released. At this time, the tip portions of the sensors abut against each other by the biasing force of the spring, and the electric wire is surrounded and clamped by the annular body formed by the sensors. Next, the current flowing through the electric wire is detected by each sensor.
Documents of the prior art
Non-patent document
Patent document 1: japanese laid-open patent publication No. 2007-17188 (pages 4-5, FIG. 1)
Disclosure of Invention
Technical problem to be solved by the invention
However, the above-described clamp sensor has the following problems that need improvement. That is, in the caliper sensor of the type including the above-described caliper sensor, each sensor is formed thick and the cross section of each sensor is formed in a substantially square shape in order to ensure sufficient sensitivity. Therefore, the clamp sensor has the following technical problems: in the case where another electric wire is arranged near the electric wire of the detection object or an obstacle exists near the electric wire of the detection object, it is difficult to insert the tip end portion of each sensor into a gap between the electric wire of the detection object and the other electric wire or the obstacle, and thus the electric wire of the detection object cannot be pinched by each sensor, and improvement is desired in this point.
The present invention has been made in view of the above-mentioned problems, and a main object of the present invention is to provide a caliper sensor and a measuring apparatus capable of reliably clamping a clamping target.
Technical scheme for solving technical problem
In order to achieve the above object, a first aspect of the present invention provides 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,
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.
In addition to the clamp sensor according to the first aspect, in the clamp sensor according to the second aspect, each part of each clamp arm on the side of the tip portion is formed as: 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.
A third aspect of the present invention provides 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,
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.
In addition to the clamp sensor according to the third aspect, in the clamp sensor according to the fourth aspect, each part of each clamp arm on the side of the tip portion is formed as: 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.
Further, a pincer sensor according to a fifth aspect of the present invention includes 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 pincer 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,
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.
Further, in the caliper sensor according to the fifth aspect, in the caliper sensor according to the sixth aspect, each part on the tip end portion side of each clamp arm 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.
The forceps sensor according to a seventh aspect of the present invention includes 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 each of distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the distal end portions are closed, the forceps 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 each of the clamp arms,
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.
Further, in the caliper sensor according to the eighth aspect, the respective portions of the respective clamp arms on the side of the distal end portion are 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.
The clamp sensor according to the ninth aspect of the present invention comprises a pair of clamp arms each formed in a substantially arc shape in plan view, at least one of the pair of clamp arms being configured to be rotatable so as to open and close each of distal end portions of the pair of clamp arms, the pair of clamp arms forming an annular body in a state where the 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 each of the clamp arms,
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.
In addition to the caliper sensor according to claim ninth, in the caliper sensor according to claim ten, each part on the tip end portion side of each clamp arm is formed as: 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.
Further, in the caliper sensor according to any one of claims one to ten, in the caliper sensor according to claim eleven, each of the clamp arms includes a sensor housing constituting a housing of each of the clamp arms, and 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.
In addition to the clamp sensor according to any one of claims one to eleven, in the clamp sensor according to claim twelve, each of the clamp arms is formed with: 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.
In addition to the clamp sensor according to the twelfth aspect, in the clamp sensor according to the thirteenth aspect, each of the clamp arms includes a core that generates a magnetic field by a current flowing through the object to be clamped, and each of the clamp arms 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.
In addition to the clamp sensor according to the twelfth aspect, in the clamp sensor according to the fourteenth aspect, each of the clamp arms is formed with: 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.
Further, in the caliper sensor according to any one of claims one to fourteen, in the caliper sensor according to fifteenth, 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.
Further, in the caliper sensor according to a sixteenth aspect, in addition to the caliper sensor according to any one of the first to fifteenth aspects, each of the clamp arms is formed with: 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.
Further, in the caliper sensor according to a seventeenth aspect, in addition to the caliper sensor according to any one of the first to sixteenth aspects, each of the clamp arms is formed with: 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.
The eighteenth measurement device according to the present invention comprises: the clamp sensor according to any one of claims one to seventeen; and a measuring unit that measures a measured amount of the clamping object based on the detected amount detected by the clamp sensor.
Effects of the invention
In the caliper sensor according to the first aspect and the measurement device according to the eighteenth aspect, the clamp arms are formed such that the portions on the tip end portion side thereof are: among the respective sides constituting the outer shape of the cross-section, a line segment connecting both end portions of at least one of the respective sides corresponding to the respective third opposing faces is longer than the shortest one of the lengths of the respective sides corresponding to the respective first opposing faces and the respective second opposing faces. Therefore, in the caliper sensor and the measuring apparatus, the relative distance between the sides corresponding to the third opposing surfaces can be made shorter than the relative distance between the sides corresponding to the first opposing surfaces and the relative distance between the sides corresponding to the second opposing surfaces. As a result, according to the caliper sensor and the measuring apparatus, the distal end portions of the respective clamp arms can be easily inserted into a narrow gap with the measuring apparatus tilted, as compared with a conventional structure (a structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cutting plane of each portion on the distal end portion side of the respective clamp arms is quadrangular and the diagonal distance of the cutting plane 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. Therefore, according to the clamp sensor and the measuring device, even when another conductor or an obstacle is present near the conductor to be clamped, for example, the conductor to be clamped can be reliably clamped.
Further, according to the caliper sensor of the second aspect and the measuring apparatus of the eighteenth aspect, each portion on the side of the distal end portion of each clamp arm is formed such that the length of all the line segments connecting both end portions of each side corresponding to each third opposing surface is longer than the shortest length of the lengths of the sides corresponding to each first opposing surface and each second opposing surface, and therefore, the relative distance between each side corresponding to each third opposing surface can be made shorter than the relative distance between each side corresponding to each first opposing surface and the relative distance corresponding to each second opposing surface. Therefore, for example, even in a state where the measuring device is tilted so as to be rotated in either of the right-hand rotation direction and the left-hand rotation direction with the longitudinal direction of the measuring device as an axis, the tip end portions of the clamp arms can be easily inserted into the narrow gaps.
In the caliper sensor according to the third aspect and the measuring apparatus according to the eighteenth aspect, in each of the outer shapes forming the cutting plane, a relative distance between a line segment connecting both end portions of one of the sides corresponding to the third opposing surfaces and a line segment connecting both end portions of the other of the sides is within a 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. Therefore, in the caliper sensor and the measuring apparatus, the relative distance corresponding to each third opposing surface can be sufficiently shorter than the diagonal distance of the cross-sectional surface in the conventional structure (the structure in which each corner of the quadrangular prism is not chamfered) in which the outer shape of the cross-sectional surface at each portion on the distal end portion side of each clamp arm is formed in a quadrangular shape. As a result, according to the caliper sensor and the measuring apparatus, the distal end portions of the clamp arms can be easily inserted into a narrow gap in a state where the measuring apparatus is tilted, as compared with the conventional configuration. Therefore, according to the clamp sensor and the measuring device, even when another conductor or an obstacle is present near the conductor to be clamped, for example, the conductor to be clamped can be reliably clamped.
Further, according to the caliper sensor of the fourth aspect and the measuring apparatus of the eighteenth aspect, the relative distance between all combinations of the sides of the distal end portion of each clamp arm, the sides being formed so as to face each other at each portion, is within the following range: greater than (100/√ 2)% of any shorter distance of the relative distances of the sides corresponding to the first opposing faces and the relative distances of the sides corresponding to the second opposing faces, and less than 110% of the any shorter distance, thereby making all the relative distances corresponding to the third opposing faces sufficiently shorter than the diagonal distance of the cross-sectional face in the conventional structure. Therefore, according to the caliper sensor and the measuring device, even in a state where the measuring device is tilted so as to be rotated in either of the right-hand rotation direction and the left-hand rotation direction with the longitudinal direction of the measuring device as an axis, for example, the distal end portions of the clamp arms can be easily inserted into a narrow gap.
Further, according to the caliper sensor described in the fifth aspect and the measuring apparatus described in the eighteenth aspect, the length of the line segment connecting both end portions of at least one of the sides corresponding to the third opposing surfaces among the respective sides constituting the outer shape of the cutting plane is set to fall within the following range: and 57% or more and less than 1000% of the shortest length of each of the first opposing surfaces and the second opposing surfaces. Therefore, according to the caliper sensor and the measuring apparatus, the relative distance of the sides corresponding to the third opposing surfaces can be made sufficiently shorter than the diagonal distance of the cross-sectional surface in the conventional structure (structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cross-sectional surface at each portion on the distal end portion side of each clamp arm is formed in a quadrangular shape. As a result, according to the caliper sensor and the measuring apparatus, the distal end portions of the clamp arms can be easily inserted into a narrow gap in a state where the measuring apparatus is tilted, as compared with the conventional configuration. Therefore, according to the clamp sensor and the measuring device, even when another conductor or an obstacle is present near the conductor to be clamped, for example, the conductor to be clamped can be reliably clamped.
Further, according to the caliper sensor of the sixth aspect and the measuring apparatus of the eighteenth aspect, the respective portions on the distal end portion side of the respective clamp arms are formed such that the lengths of all the line segments connecting the respective both end portions of the respective sides corresponding to the respective third opposing surfaces are within the following ranges: the shortest length among the lengths corresponding to the first opposing surfaces and the second opposing surfaces is 57% or more and less than 1000%, and thus all the opposing distances of the sides corresponding to the third opposing surfaces can be made sufficiently shorter than the diagonal distance of the cross-sectional surface in the conventional structure. Therefore, according to the caliper sensor and the measuring device, even in a state where the measuring device is tilted so as to be rotated in either of the right-hand rotation direction and the left-hand rotation direction with the longitudinal direction of the measuring device as an axis, for example, the distal end portions of the clamp arms can be easily inserted into a narrow gap.
Further, according to the caliper sensor of the seventh aspect and the measuring apparatus of the eighteenth aspect, since each portion on the distal end portion side of each clamp arm is formed such that each side corresponding to each first opposing surface among the respective sides constituting the outer shape of the cut surface is a straight line and each side corresponding to each second opposing surface is a curved line curved outward, the longest relative distance of each side corresponding to each second opposing surface can be set to be equal to or less than the relative distance of each side corresponding to each first opposing surface, and therefore, compared with the conventional structure (the structure in which each corner portion of the quadrangular prism is not chamfered) formed such that the outer shape of the cut surface of each distal end portion side portion of the clamp arm is quadrangular 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 longest relative distance of each side corresponding to each second opposing surface, the tip end portion of the clamp arm can be easily inserted into a narrow gap in a state where the measuring apparatus is tilted. Therefore, according to the clamp sensor and the measuring apparatus, even when another conductor or an obstacle exists near the conductor to be clamped, the conductor to be clamped can be reliably clamped.
In the caliper sensor according to claim eight and the measurement device according to claim eighteen, the respective portions of the distal end portion of each clamp arm are formed such that the longest relative distance along a direction perpendicular to the opening surface of the annular body of each side corresponding to each second opposing surface is equal to or less than the relative distance of each side corresponding to each first opposing surface. Therefore, according to the caliper sensor and the measuring device, the distal end portion of the clamp arm can be inserted into the narrow gap more easily by tilting the measuring device so that the tilt angle of the opening surface of the annular body with respect to the extending direction of the conductor to be clamped becomes smaller.
Further, according to the caliper sensor of the ninth aspect and the measuring apparatus of the eighteenth aspect, since each part on the front end portion side of each clamp arm is formed such that each side corresponding to each first opposing surface and each side corresponding to each second opposing surface among the respective sides constituting the outer shape of the cut surface form a straight line, and each side corresponding to each fourth opposing surface forms a curved line curved outward, the longest relative distance of each side corresponding to each fourth opposing surface opposed can be set to be equal to or less than the relative distance of each side corresponding to each first opposing surface, and therefore, compared with the conventional structure (the structure in which each corner portion of the quadrangular prism is not chamfered) in which the outer shape of the cut surface of each front end portion part of the clamp arm is formed such that 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, the tip end portion of the clamp arm can be easily inserted into a narrow gap in a state where the measuring apparatus is tilted. Therefore, according to the clamp sensor and the measuring apparatus, even when another conductor or an obstacle exists near the conductor to be clamped, the conductor to be clamped can be reliably clamped.
In the caliper sensor according to the tenth aspect and the measuring apparatus according to the eighteenth aspect, the position of each clamp arm on the distal end portion side is formed such that the relative distance between the respective sides corresponding to the second opposing surfaces is equal to or less than the relative distance between the respective sides corresponding to the first opposing surfaces. Therefore, according to the caliper sensor and the measuring device, the distal end portion of the clamp arm can be inserted into the narrow gap more easily by tilting the measuring device so that the tilt angle of the opening surface of the annular body with respect to the extending direction of the conductor to be clamped becomes smaller.
In the caliper sensor according to the eleventh aspect and the measuring apparatus according to the eighteenth aspect, the clamp arms are formed such that the thickness of each portion of the sensor case constituting the housing of each clamp arm corresponding to the tip end portion side of each clamp arm is uniform or substantially uniform when viewed in a cross-sectional view. Therefore, according to the caliper sensor and the measuring apparatus, compared to a structure in which the thickness of each sensor case is not uniform, stress concentration in a portion where the thickness of each sensor case is thin can be avoided, the strength of each sensor can be improved, and further, breakage of each sensor case when a load acts on each sensor case can be prevented.
Further, according to the caliper sensor of the twelfth aspect and the measurement device of the eighteenth aspect, the clamp arms are formed such that the area of the cross-section of each portion on the proximal end portion side of each clamp arm is larger than the area of the cross-section of each portion on the distal end portion side, whereby the strength of each clamp arm can be sufficiently increased as compared with a configuration in which each clamp arm is formed such that the area of the cross-section of each portion on the distal end portion side is the same as the area of the cross-section of each portion on the proximal end portion side.
In the clamp sensor according to the thirteenth aspect and the measuring apparatus according to the eighteenth aspect, each clamp arm is formed such that an area of an outer shape of a cross-section at a portion between a boundary surface and the distal end portion is smaller than an area of an outer shape of a cross-section at a portion between the boundary surface and the proximal end portion, wherein the boundary surface passes through a point in a range of a length corresponding to 40% of a linear distance from a top to a center of a straight line on the straight line passing through the center of the graph in a top view of the ring body and the magnetic circuit, and the boundary surface is orthogonal to the straight line. In this case, when a surface passing through a point beyond a range corresponding to 40% of the length and close to the top is defined as a boundary surface, the length of the portion on the side of the tip end portion having a small area (i.e., being thin) is short, and when one of a plurality of clamping objects arranged side by side at a narrow interval is clamped, it is difficult to insert the tip end portion of each clamping arm into the back side of the narrow gap between the adjacent clamping objects. On the other hand, when a surface passing through a point beyond a range corresponding to 40% of the length and close to the proximal end portion is defined as a boundary surface, the portion on the proximal end portion side having a large area (i.e., a large thickness) is short in length, and the strength of each clamp arm is reduced. In contrast, in the caliper sensor and the measuring apparatus, since the surface passing through the point defined within the range corresponding to 40% of the length is defined as the boundary surface, the tip end portions of the clamp arms can be easily inserted into the back side of the narrow gap between the adjacent clamp objects without reducing the strength of the clamp arms. Therefore, according to the clamp sensor and the measuring device, the clamping object can be reliably clamped.
In the caliper sensor according to the fourteenth aspect and the measurement device according to the eighteenth aspect, each clamp arm is formed such that an area of an outer shape of a cross-section at a portion between a boundary surface and the distal end portion is smaller than an area of an outer shape of a cross-section at a portion between the boundary surface and the proximal end portion, wherein the boundary surface passes through a point in a range of a length corresponding to 40% of a linear distance from a top to a center of a straight line centered on the center of the straight line passing through the center of the straight line of a graph in a top view of the top of the annular body and an inner periphery of the annular body, and the boundary surface is orthogonal to the straight line. In this case, when a surface passing through a point beyond a range corresponding to 40% of the length and close to the top is defined as a boundary surface, the length of the portion on the side of the tip end portion having a small area (i.e., being thin) is short, and when one of a plurality of clamping objects arranged side by side at a narrow interval is clamped, it is difficult to insert the tip end portion of each clamping arm into the back side of the narrow gap between the adjacent clamping objects. On the other hand, when a surface passing through a point beyond a range corresponding to 40% of the length and closer to the base end portion is defined as a boundary surface, the portion on the base end portion side having a large area (i.e., a large thickness) is short in length, and the strength of each clamp arm is reduced. In contrast, in the caliper sensor and the measuring apparatus, since the surface passing through the point defined within the range corresponding to 40% of the length is defined as the boundary surface, the tip end portions of the clamp arms can be easily inserted into the back side of the narrow gap between the adjacent clamp objects without reducing the strength of the clamp arms. Therefore, according to the clamp sensor and the measuring device, the clamping object can be reliably clamped.
In the caliper sensor according to the fifteenth aspect and the measurement device according to the eighteenth aspect, each of the clamp arms is formed with: the first opposing surfaces of the outer peripheral surface of the annular body constituting the tip end portions of the clamp arms are formed as a single plane orthogonal to the direction connecting the tip end portion and the base end portion of the annular body in the shape state of the annular body, and the relative distance between the first opposing surfaces at the tip end portions is shorter than the relative distance between the first opposing surfaces at the other portions of the clamp arms except the tip end portions. Therefore, according to the caliper sensor and the measuring apparatus, the distal end portions of the clamp arms can be inserted into the narrow gap more easily. Further, since the relative distance of each first opposing surface at each front end portion is short, for example, even in the case where an obstacle such as a wall exists behind the clamping object and the gap between the clamping object and the obstacle is narrow, it is possible to avoid the obstacle from contacting each clamping arm, thereby reliably clamping the clamping object.
In the caliper sensor according to the sixteenth aspect and the measurement device according to the eighteenth aspect, each of the clamp arms is formed with: the length along the straight line between the position separated by 15mm from the center of the top part and the outer peripheral surface of the annular body in the direction perpendicular to the straight line passing through the top part and the center of the figure and parallel to the opening surface of the annular body is in the range of 9mm to 11 mm. In this case, when the clamp arms are formed so as to have the length of more than 11mm, the shape of the tip end portion side of each clamp arm is too thin and long, and for example, when it is intended to clamp a clamping object arranged in the vicinity of the wall surface by each clamp arm, the tip end portions of the clamp arms may come into contact with the wall surface, and clamping may be difficult. Further, when the clamp arms are formed to have a length of more than 11mm, the top side of the annular body is formed into an abnormally elongated shape, and the detection characteristics of the detected amount may be deteriorated. On the other hand, when the clamp arms are formed so as to have the length of less than 9mm, the shape of the tip end portion side of each clamp arm is close to an arc shape, and for example, when one of a plurality of clamp objects arranged close to each other is to be clamped by each clamp arm, it is difficult to insert each tip end portion into a gap between the one clamp object and another adjacent clamp object, and clamping may become difficult. In contrast, according to the caliper sensor and the measuring apparatus, the clamp arms are formed in the range of 9mm to 11mm in length, and the detection characteristics of the magnetic field can be maintained well, and the clamped object can be clamped more reliably.
Further, in the caliper sensor according to the seventeenth aspect and the measurement device according to the eighteenth aspect, the maximum distance between any two points of the outer shape of the cross-section at the position between the boundary surface and the distal end portion side of each clamp arm is within a range of 1/6 or more and 1/5 or less of a separation distance between the distal end portions of each clamp arm in a state where the distal end portions are maximally separated from each other. In this case, when the clamp arms are formed so that the ratio is greater than 1/5, it is difficult to insert the tip end portions of the clamp arms into narrow gaps between adjacent clamp objects when clamping one of the clamp objects arranged side by side at narrow intervals. On the other hand, when the clamp arms are formed so that the ratio is less than 1/6, if the lever for opening the clamp arms (separating the tip end portions from each other) is pushed in to the maximum, the separation distance in the state where the tip end portions are separated from each other to the maximum becomes excessively long, and when a plurality of clamp objects are arranged at narrow intervals, there is a possibility that the plurality of clamp objects are clamped, and therefore, the amount of pushing in the lever needs to be adjusted, and the operability may be deteriorated. In contrast, according to the caliper sensor and the measuring apparatus, the clamp arms are formed at the relative distances within the range of 1/6 to 1/5 of the separation distance, and the distal end portions can be easily inserted into the narrow gaps between the adjacent clamp objects in the state where the control rod is maximally pushed in, so that the operability can be sufficiently improved, and only one of the plurality of clamp objects can be more reliably clamped.
Drawings
Fig. 1 is a perspective view of the clamp meter 1.
Fig. 2 is a structural diagram showing the structure of the clamp meter 1.
Fig. 3 is a perspective view of the clamp meter 1 in a state where 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 where the sensor housings 10a and 10b, a part of the body housing 30, and the like are removed.
Fig. 6 is a sectional view comparing the section taken along line a-a and the section taken along line B-B of fig. 4.
Fig. 7 is a sectional view taken along line a-a of fig. 4.
Fig. 8 is an explanatory diagram for explaining the structure of the clamp arms 11a and 11 b.
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 for explaining a method of using the clamp table 1.
Fig. 11 is a second explanatory diagram for explaining a method of using the clamp table 1.
Fig. 12 is a third explanatory diagram for explaining a method of using the clamp table 1.
Fig. 13 is a front view of the clamp meter 1A.
Fig. 14 is a sectional view showing the structure of the clamp sensor 402.
Fig. 15 is a sectional view showing the structure of the clamp sensor 502.
Fig. 16 is a sectional view showing the structure of the clamp sensor 602.
Detailed Description
Hereinafter, embodiments of the clamp sensor and the measuring device will be described with reference to the drawings.
First, the structure of the clamp meter 1 shown in fig. 1 will be described. The clamp meter 1 is an example of a measuring device configured to be able to measure a current (an example of a measured amount) flowing through a conductor 400 to be clamped, for example, as shown in fig. 10, in a non-contact manner (metal non-contact manner). Specifically, as shown in fig. 1 to 3, the clamp meter 1 includes a clamp sensor 2 and a main body 3.
As shown in fig. 1 and 3, the clamp sensor 2 includes a pair of clamp arms 11a and 11b (hereinafter, also referred to as "clamp arm 11" when not distinguished), and detects a magnetic field, which is a detected amount generated when a current flows through the conductor 400, in a non-contact manner in a state where the conductor 400 is clamped (surrounded) by the clamp arms 11a and 11b, as shown in fig. 4.
In the caliper sensor 2, as shown in fig. 1 and 3, the clamp arm 11b (one of the clamp arms 11a and 11 b) is configured to be rotatable about a rotation shaft 23 (see fig. 4) to open and close (contact and separate) the distal end portions 21a and 21b of the clamp arms 11a and 11b, and the clamp arm 11a is fixed to the main body case 30 of the main body portion 3 in a state of not rotating. In the caliper sensor 2, the clamp arm 11b is configured to be rotated in response to an operation (press-fitting or press-fitting release) of the control lever 30a disposed in the main body case 30. In the following description, a state in which the distal end portions 21a and 21b of the clamp arms 11a and 11b are closed (the state shown in fig. 1) is also referred to as a "closed state", and a state in which the distal end portions 21a and 21b are opened (the states shown in fig. 3 and 9) is also referred to as an "opened state".
As shown in fig. 4, the clamp arm 11a includes a sensor housing 10a, a core 41 (see fig. 5 and 7) housed in the sensor housing 10a, and a magnetic detection element (for example, a hall element) outside the drawing. As shown in fig. 4, the clamp arm 11b includes a sensor housing 10b and a core 41 (see fig. 5 and 7) housed in the sensor housing 10 b.
As shown in fig. 4, the clamp arms 11a and 11b are formed in a substantially arc shape in a plan view in the thickness direction (axial direction of the rotating shaft 23), respectively, so that the ring-shaped body 100 is formed in a closed state in which the distal end portions 21a and 21b are closed with each other. In this case, as shown in the same drawing, the annular body 100 is configured such that the inner peripheral surface on the base end 100b side is formed in a semicircular shape in plan view by the portions on the base end 22a and 22b side of the clamp arms 11a and 11b (hereinafter also referred to as "base end side portions 52a and 52 b"), the top portion 100a (portion corresponding to the tip end portions 21a and 21 b) side is formed in an arc-like elongated annular shape in plan view by the portions on the tip end portions 21a and 21b side of the clamp arms 11a and 11b (hereinafter also referred to as "tip end side portions 51a and 51 b"), and the curvature of the inner peripheral surface on the top portion 100a side is smaller than that of the inner peripheral surface on the base end portion 100b side (the curvature radius of the inner peripheral surface on the top portion 100a side is larger than that of the inner peripheral surface on the 100b side).
As shown in fig. 5, the clamp arms 11a and 11b are formed into an annular body 100, and an annular (approximately elliptical) magnetic path Mc is formed by the respective cores 41. 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 by the current, and the magnetic detection element of the clamp arm 11a detects the magnetic field.
As shown in fig. 6, the clamp arms 11a and 11B have a cross-section Sc1 (e.g., a cross-section taken along line a-a in fig. 4) perpendicular to the longitudinal direction of the distal end side portions 51a and 51B, which has an approximately octagonal outer shape, for example, and the clamp arms 11a and 11B have a cross-section Sc2 (e.g., a cross-section taken along line B-B in fig. 4) perpendicular to the longitudinal direction of the proximal end side portions 52a and 52B, which has an approximately rectangular outer shape, for example. 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 portions 51a and 51b is smaller than the area Sa2 of the outer shape of the cut surface Sc2 at the proximal end portions 52a and 52b (hereinafter, also referred to as "area Sa" when the areas Sa1 and Sa2 are not distinguished) (the area Sa2 is larger than the area Sa 1). That is, the clamp arms 11a and 11b are formed such that the distal end portions 51a and 51b are thinner than the proximal end portions 52a and 52 b.
Here, in the caliper sensor 2, the distal end portions 51a and 51b and the proximal end portions 52a and 52b are defined as follows. First, as shown in fig. 5, a straight line passing through the top 100a of the annular body 100 and a centroid C1 of a graph in a plan view of a magnetic circuit Mc (indicated by a broken line in the same drawing) formed by each core 41 is defined as a straight line H1. Next, a length corresponding to 40% of a distance D101 (linear distance) from the top portion 100a (specifically, the outer facing surface 101 of the top portion 100 a) to the center C1 is determined as a length L101, and an arbitrary point within a range of the length L101 centered on the center C1 on the straight line H1 is defined (hereinafter, also referred to as "defined point P101"). In this case, in this example, a point separated from the centroid C1 toward the apex 100a by a length corresponding to 17% of the distance D101 is defined as the predetermined point P101. Next, a plane passing through the predetermined point P101 and perpendicular to the straight line H1 is defined as a boundary surface Sb1, a region between the boundary surface Sb1 and the distal ends 21a, 21b of the clamp arms 11a, 11b is defined as distal end side regions 51a, 51b, and a region between the boundary surface Sb1 and the proximal ends 22a, 22b is defined as proximal end side regions 52a, 52 b.
As shown in fig. 1, 3, and 4, the distal end side portions 51a and 51b of the clamp arms 11a and 11b each have a pair of opposing surfaces 101 (corresponding to first opposing surfaces) constituting the outer peripheral surface and the inner peripheral surface of the annular body 100, a pair of opposing surfaces 102 (corresponding to second opposing surfaces) constituting both 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 (both corresponding to third opposing surfaces, and two pairs of third opposing surfaces in total), and as shown in fig. 7, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are each formed in an octagonal shape in the outer shape of a cross-section Sc1 (a-a line cross section in fig. 4) orthogonal to the longitudinal direction of the clamp arms 11a and 11 b. In other words, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in an octagonal prism shape in which corners of a quadrangular prism shown by a broken line in fig. 7 are chamfered (the opposing surfaces 103 and 104 correspond to surfaces formed by chamfering (chamfered surfaces)). Since the respective distal end portions 51a and 51b have the same cross-sectional shape, only the cross-sectional shape of the distal end portion 51a is shown in the same drawing, and the cross-sectional shape of the distal end portion 51b is not shown.
As shown in fig. 7, in the caliper sensor 2, the tip end portions 21a and 21b of the tip end portions 51a and 51b of the clamp arms 11a and 11b are removed: of the octagonal sides of the cross-section Sc1, the sides E1 corresponding to the opposing surfaces 101 and the sides E2 corresponding to the opposing surfaces 102 have the same length L1, and the sides E3 corresponding to the opposing surfaces 103 (the length of a line segment connecting both ends of the sides E3) and the sides E4 corresponding to the opposing surfaces 104 (the length of a line segment connecting both ends of the sides E4) have the same length L2. In the caliper sensor 2, as shown in the same drawing, the respective distal end side portions 51a and 51b are formed to have a length L2 longer than a length L1 (the shortest length of the sides E1 and E2).
In the example shown in fig. 7, since the sides E3 and E4 are straight lines, the length of the line segment connecting both end portions of the sides E3 and E4 is the same as that of the sides E3 and E4, but a configuration in which the sides E3 and E4 are curved (arc-shaped) (a configuration in which the outer shape of the cut surface Sc1 is substantially octagonal) may be employed, and in this configuration, the tip end side portions 51a and 51b are formed so that the length L2 is longer than the length L1 (the shortest length of the lengths of the sides E1 and E2) using the length of the line segment connecting both end portions of the sides E3 and E4 as the length L2.
In the caliper sensor 2, the length L1 of each side E1, E2 and the length L2 of each side E3, E4 are defined as described above, and the distal end side portions 51a, 51b are formed so that 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, as shown in fig. 7.
In the caliper sensor 2, as shown in fig. 7, the thickness T of each portion of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b corresponding to the distal end portions 51a and 51b (hereinafter, also referred to as "the distal end portion side portion of the sensor housings 10a and 10 b") is formed to be uniform (or substantially uniform) when viewed from a cross-section Sc 1.
In the caliper sensor 2, as shown in fig. 8, the outer peripheral facing surfaces 101 (facing surfaces 101 constituting the outer peripheral surface of the annular body 100) at the distal end portions 21a and 21b of the clamp arms 11a and 11b are formed as a single plane orthogonal to the direction (vertical direction in the same drawing) connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100 in the state where the annular body 100 is formed. That is, the ring body 100 is formed in a shape in which a part of the outer peripheral side (a part indicated by a broken line in the same drawing) at the top portion 100a is cut out by a flat surface. As described above, in the caliper sensor 2, the clamp arms 11a and 11b are formed such that the facing distance D1 of the facing surfaces 101 at the distal end portions 21a and 21b (hereinafter, the facing distance D1 is also referred to as "facing distance D1 a") is shorter than the facing distance D1 of the facing surfaces 101 at the other portions of the clamp arms 11a and 11b excluding the distal end portions 21a and 21b (hereinafter, the facing distance D1 is also referred to as "facing distance D1 b"), as shown in the same drawing. Therefore, in the caliper sensor 2, the length of the annular body 100 along the direction connecting the apex portion 100a and the base end portion 100b is reduced in accordance with the reduction in the facing distance D1a between the facing surfaces 101 at the distal end portions 21a and 21 b.
In the caliper sensor 2, as shown in fig. 8, the clamp arms 11a and 11b are formed such that a length L103 along a straight line H1 between a position P, which is separated by 15mm (hereinafter, this length is also referred to as "length L102") from the center of the top portion 100a in a direction perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100, and the outer facing surface 101 of the annular body 100 is in a range of 9mm to 11 mm. That is, the clamp arms 11a, 11b are formed such that the ratio of the length L103 to the length L102 is in the range of 9/15 or more and 11/15 or less.
Here, for example, when the clamp arms 11a and 11b are formed so that the length L103 is larger than 11mm, the shapes of the distal end portions 21a and 21b of the clamp arms 11a and 11b are too thin and long, and for example, when it is desired to clamp the conductor 400 arranged in the vicinity of the wall surface (behind the wall surface) by the clamp arms 11a and 11b, the distal end portions 21a and 21b of the clamp arms 11a and 11b come into contact with the wall surface, and clamping may be difficult. Further, when the clamp arms 11a and 11b are formed so that the length L103 is longer than 11mm, the top portion 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 9mm, the shape of the clamp arms 11a and 11b on the side of the distal ends 21a and 21b approaches an arc shape, and for example, when one conductor 400 of a plurality of conductors 400 arranged close to each other is to be clamped by the clamp arms 11a and 11b, the distal ends 21a and 21b may be difficult to be inserted into a gap between the one conductor 400 and the other conductor 400 adjacent thereto, and clamping may become difficult. In contrast, in the caliper sensor 2, the clamp arms 11a and 11b are formed such that the length L103 along the straight line H1 between the position P, which is a position 15mm apart from the center of the top portion 100a in the direction perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100, and the outer facing surface 101 of the annular body 100 is in the range of 9mm to 11mm, whereby the conductor 400 can be reliably clamped while the detection characteristic of the magnetic field is maintained.
In addition, in the caliper sensor 2, as shown in fig. 9, the clamp arms 11a and 11b are formed as follows: the longest distance among the straight line distances between any two points in the outer shape of the cut surface Sc1 at the distal end portions 51a, 51b is defined as a facing distance D1 (see also fig. 7), and the distance D102 is defined as the distance D102 separating the distal ends 21a, 21b of the clamp arms 11a, 11b from each other in the state where the distal ends 21a, 21b are maximally separated from each other, and at this time, the ratio R of the facing distance D1 to the distance D102 is in the range of 1/6 to 1/5. In the caliper sensor 2, the separation distance D102 is defined within a range of 56.8mm ± 25%, and the relative distance D1 is defined within a range of 11mm ± 25%, for example.
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, when one of the plurality of conductors 400 arranged side by side at a narrow interval is clamped as shown in fig. 10, it is difficult to insert the tip end portions 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 and 11b are formed so that the ratio R is smaller than 1/6, the distance D102 between the respective distal end portions 21a and 21b that are maximally apart from each other, that is, the control rod 30a that is maximally pressed in, is excessively long, and when a plurality of conductors 400 are arranged at narrow intervals, even if one of the conductors 400 is intended to be clamped, the plurality of conductors 400 may be clamped, and therefore, the amount of pressing in the control rod 30a needs to be adjusted, possibly deteriorating the operability. In contrast, in the caliper sensor 2, the clamp arms 11a and 11b are formed so that the ratio R is in the range of 1/6 or more and 1/5 or less, and the distal end 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 lever 30a is maximally pushed in. Therefore, in the caliper sensor 2, since it is not necessary to adjust the amount of pushing of the control lever 30a, the operability can be sufficiently improved.
In the caliper sensor 2, the proximal end portions 52a and 52b of the clamp arms 11a and 11b are formed in a substantially rectangular shape in cross section as described above, and the distal end portions 51a and 51b are thinner than the proximal end portions 52a and 52b as shown in fig. 4, that is, the clamp arms 11a and 11b are formed so that the area Sa1 of the outer shape of the cut-out surface Sc1 at the distal end portions 51a and 51b is smaller than the area Sa2 of the outer shape of the cut-out surface Sc2 at the proximal end portions 52a and 52b as shown in fig. 6. In other words, each clamp arm 11a, 11b is formed: the proximal end portions 52a, 52b are thicker than the distal end portions 51a, 51b, that is, the area of the cut Sc2 of the proximal end portions 52a, 52b is larger than the area of the cut Sc1 of the distal end portions 51a, 51 b. Therefore, the clamp sensor 2 has a sufficiently improved strength of the clamp arms 11a and 11b, compared to a configuration in which the clamp arms 11a and 11b are formed so that the area of the cut surface Sc1 of the distal end side portions 51a and 51b is the same as the area of the cut surface Sc2 of the proximal end side portions 52a and 52 b.
In the caliper sensor 2, as described above, the region between the boundary surface Sb1 and the distal end portions 21a, 21b, which passes through the predetermined point P101 and is orthogonal to the straight line H1, is defined as the distal end side regions 51a, 51b, and the region between the boundary surface Sb1 and the proximal end portions 22a, 22b is defined as the proximal end side regions 52a, 52b, wherein the predetermined point P101 is a point defined within the range of the length L101, and the length L101 is a length corresponding to 40% of the distance D101 from the top portion 100a to the center C1, with the center C1 of the graph in a plan view of the magnetic circuit Mc as the center. In this case, when a surface passing through a point beyond the range of the length L101 and closer to the top portion 100a is defined as the boundary surface Sb1, the length of the tip end portion side portions 51a, 51b having a small (narrow) area Sa is short, and when one of the plurality of conductors 400 arranged side by side at a narrow interval is clamped, it becomes difficult to insert the tip end portions 21a, 21b of the clamp arms 11a, 11b into the back side of the narrow gaps G1, G2 between the adjacent conductors 400. On the other hand, if a surface passing through a point beyond the length L101 and closer to the proximal end portion 100b is defined as the boundary surface Sb1, the proximal end portion side portions 52a, 52b having a large (thicker) area Sa become shorter in length, and the strength of the clamp arms 11a, 11b decreases. In contrast, in the caliper 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 distal ends 21a, 21b of the clamp arms 11a, 11b can be easily inserted into the back sides of the narrow gaps G1, G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a, 11 b.
As shown in fig. 2, the main body 3 includes a display unit 31, an operation unit 32, a processing unit 33, and a main body case 30 (see fig. 1, 3, and 4) for accommodating or arranging the above-described units.
The display unit 31 is composed of, for example, a liquid crystal panel, and is disposed on the front panel of the main body case 30 as shown in fig. 1, 3, and 4. The display unit 31 displays the measured value of the current and the like under the control of the processing unit 33. The operation unit 32 includes various switches 32a and a dial 32b disposed on a front panel of the main body case 30, and outputs operation signals according to operations of these components.
The processing unit 33 controls each unit constituting the main body 3 based on an operation signal output from the operation unit 32. 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 the measured current value on the display unit 31.
Next, a method of using the clamp meter 1 and an operation of the clamp meter 1 when used will be described with reference to the drawings. As an example, a method of using the method in the case of measuring the current value of the current flowing through one conductor (for example, the conductor 400a shown in the same drawing) of the plurality of conductors 400 arranged side by side at a narrow interval as shown in fig. 10 will be described. In this case, in this example, a plurality of conductors 400 having a diameter of 21mm are arranged side by side at intervals of 12mm (the gap between adjacent conductors 400 is 12 mm).
First, the control lever 30a (see fig. 1 and 4) of the body portion 3 of the clamp meter 1 is press-fitted. At this time, the clamp arm 11b is rotated in a direction in which the distal end portions 21a and 21b of the clamp arms 11a and 11b of the caliper sensor 2 open against the biasing force of the spring outside the drawing, and the clamp arms 11a and 11b are opened as shown in fig. 3.
Next, as shown in fig. 10, the distal end portions 21a and 21b of the clamp arms 11a and 11b are brought close to the conductor 400a to be measured (clamped). Then, as shown in fig. 11, the clamp table 1 is tilted about the longitudinal direction of the clamp table 1 (the direction of the top portion 110a and the base end portion 100b of the connection ring body 100 shown in fig. 4) as an axis, the tip end portion 21a of the clamp arm 11a is inserted into the gap G1 between the conductor 400a and the conductor 400b adjacent to the right side of the conductor 400a, and the tip end portion 21b of the clamp arm 11b is inserted into the gap G2 between the conductor 400c and the conductor 400a adjacent to the left side of the conductor 400 a.
Here, as shown by the broken line in fig. 7, in the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cut surface Sc1 at the distal end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a quadrangular shape, the outer shape of the cut surface Sc1, that is, the distance between the corners opposing each other in the quadrangular shape (the diagonal distance D5 shown in the same drawing) is longer than the opposing distance D1 of each side E1 and the opposing distance D2 of each side E2. Therefore, in the conventional configuration, 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, it is difficult to insert the distal end portions 21a and 21b of the clamp arms 11a and 11b into the gaps G1 and G2 when the clamp watch 1 is tilted.
In contrast, in the caliper sensor 2, as described above, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in the octagonal shape in which the corners of the quadrangular prism are chamfered so that the cross-section Sc1 has an octagonal shape, and the length L2 of the sides E3 and E4 formed in the octagonal shape, which is the outer shape of the cross-section Sc1, is longer than the length L1 of the sides E1 and E2. Therefore, in the caliper sensor 2, the relative distance D3 of the sides E3 and the relative distance D4 of the sides E4 are shorter than the relative distance D1 of the sides E1 and the relative distance D2 of the sides E2. Therefore, in the caliper sensor 2, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 in a state where the caliper table 1 is tilted, as compared with the conventional configuration.
In the caliper sensor 2, the clamp arms 11a and 11b are formed such that the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 to 1/5 as described above, and therefore, the tip portions 21a and 21b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 in the state where the control rod 30a is maximally pushed in, the relative distance D1 being the longest distance between any two points in the outer shape of the cut surface Sc1 at the tip portion side portions 51a and 51b, and the separation distance D102 being the separation distance between the tip portions 21a and 21b in the state where the tip portions 21a and 21b of the clamp arms 11a and 11b are maximally separated from each other. Therefore, in the caliper sensor 2, since it is not necessary to adjust the amount of pushing of the control lever 30a, the operability can be sufficiently improved.
Next, the press-fitting of the control lever 30a is released in a state where the distal end portions 21a, 21b of the clamp arms 11a, 11b are inserted into the gaps G1, G2, respectively. At this time, the clamp arm 11b is rotated in a direction in which the distal end portions 21a, 21b of the clamp arms 11a, 11b contact each other by the biasing force of the spring outside the drawing, and the clamp arms 11a, 11b are closed as shown in fig. 12. Thereby, as shown in the same drawing, the conductor 400a is clamped by the clamp arms 11a, 11 b.
In this case, in the caliper sensor 2, as described above, the clamp arms 11a and 11b are formed such that: the region between the boundary surface Sb1 passing through the predetermined point P101 defined within the range of the length L101 corresponding to 40% of the distance D101 from the apex 100a to the center C1 of the graph in a plan view of the magnetic path Mc and the tip 21a, 21b of the clamp arm 11a, 11b is defined as the tip side regions 51a, 51b, the region between the boundary surface Sb1 and the base ends 22a, 22b of the clamp arms 11a, 11b is defined as the base end side regions 52a, 52b, and the area Sa1 of the outer shape of the cut surface Sc1 at the tip side regions 51a, 51b is smaller than the area Sa2 of the outer shape of the cut surface Sc2 of the base end regions 52a, 52 b. Therefore, in the caliper sensor 2, the distal ends 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a and 11 b. Therefore, the clamp sensor 2 can reliably clamp the conductor 400 a.
Next, the magnetic detection element disposed in the clamp arm 11a detects a magnetic field generated in the core bodies of the clamp arms 11a and 11b by the current flowing through the conductor 400a, and outputs a detection signal. In this case, in the caliper sensor 2, as described above, the clamp arms 11a and 11b are formed such that the length L103 along the straight line H1 between the position P, which is a position separated by 15mm from the center of the top portion 100a in the direction perpendicular to the straight line H1 and parallel to the opening surface F of the ring body 100, and the outer facing surface 101 of the ring body 100 is in the range of 9mm to 11 mm. Therefore, the clamp sensor 2 can maintain the magnetic field detection characteristics well. Therefore, the clamp sensor 2 can output a detection signal that can accurately measure the current flowing through the conductor 400 a. 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.
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 400 a. Then, the pressing of the lever 30a is released, and the clamp arms 11a and 11b are closed.
In this way, in the caliper sensor 2 and the caliper gauge 1, the distal end portion side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the length L2 of the sides E3 and E4 (or the length L2 of a line segment connecting both end portions of the sides E3 and E4) of the outer shape (in this example, an octagon or an approximate octagon) constituting the cut-out plane Sc1 is longer than the length L1 of the sides E1 and E2. Therefore, in the caliper sensor 2 and the caliper table 1, the relative distance D3 of the sides E3 and the relative distance D4 of the sides E4 can be made shorter than the relative distance D1 of the sides E1 and the relative distance D2 of the sides E2. As a result, according to the caliper sensor 2 and the caliper table 1, the distal ends 21a, 21b of the clamp arms 11a, 11b can be easily inserted into the narrow gaps G1, G2 with the caliper table 1 tilted, as compared with the conventional result (a structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cut surface Sc1 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 is longer than the relative distance D1 of the sides E1 and the relative distance D2 of the sides E2. Therefore, according to the clamp sensor 2 and the clamp meter 1, even when another conductor 400 or an obstacle exists near the conductor 400 to be clamped, the conductor 400 to be clamped can be reliably clamped.
Further, according to the clamp sensor 2 and the clamp table 1, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the length L2 of all the sides E3 and E4 (or the length L2 of all line segments connecting both end portions of the sides E3 and E4) is longer than the length L1 of the sides E1 and E2, and both the facing distance D3 of the sides E3 and the facing distance D4 of the sides E4 can be made shorter than the facing distance D1 of the sides E1 and the facing distance D2 of the sides E2. Therefore, for example, even when the pincer table 1 is tilted by being rotated in any one of the right and left rotational directions about the longitudinal direction of the pincer table 1, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2.
In the caliper sensor 2 and the caliper gauge 1, the clamp arms 11a and 11b are formed so that the thickness T of the tip end portions of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b is uniform (or substantially uniform) when viewed from the section plane Sc 1. Therefore, according to the clamp sensor 2 and the clamp meter 1, compared to the structure in which the thickness T of the portion on the front end side of the sensor housings 10a and 10b is not uniform, the strength of the sensor housings 10a and 10b can be improved by avoiding stress concentration at the portion where the thickness T is thin in the sensor housings 10a and 10b, and therefore, the sensor housings 10a and 10b can be reliably prevented from being damaged when a load acts on the sensor housings 10a and 10 b.
Further, according to the clamp sensor 2 and the clamp meter 1, the clamp arms 11a and 11b are formed such that the area of the cut surface Sc2 of the proximal end portions 52a and 52b is larger than the area of the cut surface Sc1 of the distal end portions 51a and 51b, and the strength of the clamp arms 11a and 11b can be sufficiently increased as compared with a structure in which the clamp arms 11a and 11b are formed such that the area of the cut surface Sc1 of the distal end portions 51a and 51b is the same as the area of the cut surface Sc2 of the proximal end portions 52a and 52 b.
In the caliper sensor 2 and the caliper table 1, the clamp arms 11a and 11b are formed such that an area Sa1 of the outer shape of the cut-out surface Sc1 at the distal end portions 51a and 51b between the boundary surface Sb1 and the distal end portions 21a and 21b is smaller than an area Sa2 of the outer shape of the cut-out surface Sc2 at the proximal end portions 52a and 52b between the boundary surface Sb1 and the proximal end portions 22a and 22b, wherein the boundary surface Sb1 crosses a point within a range of a length L101 which is a length corresponding to 40% of a distance D101 from the top 100a to a center C1 around the center C1 on a straight line H1 of a center C1 of a graph in a plan view of the top portion 110a of the annular body 100 and the magnetic circuit Mc and is orthogonal to the straight line H1. In this case, when a surface passing through a point beyond the range of the length L101 and closer to the top portion 100a is defined as the boundary surface Sb1, the length of the tip end portion side portions 51a, 51b having a small (i.e., thin) area Sa1 is short, and when one conductor of the plurality of conductors 400 arranged side by side at a narrow interval is clamped, it is difficult to insert the tip ends 21a, 21b of the clamp arms 11a, 11b into the back side of the narrow gaps G1, G2 between the adjacent conductors 400. On the other hand, if a surface passing through a point beyond the length L101 and closer to the proximal end portion 100b is defined as the boundary surface Sb1, the proximal end portion side portions 52a and 52b having a large (i.e., thick) area Sa2 have a short length, and the strength of the clamp arms 11a and 11b is reduced. In contrast, in the caliper 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 distal ends 21a, 21b of the clamp arms 11a, 11b can be easily inserted into the back sides of the narrow gaps G1, G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a, 11 b. Therefore, according to the clamp sensor 2, the conductor 400a can be reliably clamped.
In the caliper sensor 2 and the caliper gauge 1, the clamp arms 11a and 11b are formed as follows: the outer peripheral facing surfaces 101 at the distal end portions 21a, 21b of the clamp arms 11a, 11b are formed as a single plane perpendicular to the direction connecting the distal end portion 100a and the proximal end portion 100b of the ring body 100 in the formed state of the ring body 100, and the facing distance D1a of the facing surfaces 101 at the distal end portions 21a, 21b is shorter than the facing distance D1b of the facing surfaces 101 at other portions of the clamp arms 11a, 11b than the distal end portions 21a, 21 b. Therefore, according to the clamp sensor 2 and the clamp meter 1, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be inserted into the narrow gaps G1 and G2 more easily. Further, since the facing distance D1a of the facing surfaces 101 at the distal end portions 21a and 21b is short, even when an obstacle such as a wall is present behind the conductor 400 to be clamped and the gap between the conductor 400 and the obstacle is narrow, for example, the conductor 400 to be clamped can be reliably clamped while avoiding the obstacle from contacting the clamping arms 11a and 11 b.
In the caliper sensor 2 and the caliper table 1, the clamp arms 11a and 11b are formed such that a length L103 along a straight line H1 between a position P, which is a position separated by 15mm from the center of the top portion 100a in a direction perpendicular to the straight line H1 and parallel to the opening surface F of the annular body 100, and the outer facing surface 101 of the annular body 100 is in a range of 9mm to 11 mm. In this case, when the clamp arms 11a and 11b are formed so that the length L103 is greater than 11mm, the shapes of the distal end portions 21a and 21b of the clamp arms 11a and 11b are too thin and long, and for example, when it is desired to clamp the conductor 400 arranged near the wall surface by the clamp arms 11a and 11b, the distal end portions 21a and 21b of the clamp arms 11a and 11b come into contact with the wall surface, and clamping may be difficult. Further, when the clamp arms 11a and 11b are formed so that the length L103 is longer than 11mm, the top portion 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 9mm, the shape of the clamp arms 11a and 11b on the side of the distal ends 21a and 21b approaches an arc shape, and for example, when one conductor 400 of a plurality of conductors 400 arranged close to each other is to be clamped by the clamp arms 11a and 11b, the distal ends 21a and 21b may be difficult to be inserted into a gap between the one conductor 400 and the other conductor 400 adjacent thereto, and clamping may become difficult. In contrast, according to the clamp sensor 2, the clamp arms 11a and 11b are formed such that the length L103 is in the range of 9mm to 11mm, and thus the conductor 400 can be more reliably clamped while the detection characteristic of the magnetic field is maintained.
In the clamp sensor 2 and the clamp meter 1, the clamp arms 11a and 11b are formed so that the facing distance D1 is set to be equal to or greater than 1/6 and equal to or less than 1/5 of the separation distance D102, wherein the facing distance D1 is the longest distance between any two points in the outer shape of the cut surface Sc1 at the distal end portions 51a and 51b, and the separation distance D102 is the separation distance between the distal end portions 21a and 21b of the clamp arms 11a and 11b in the state where the distal end portions 21a and 21b are maximally separated from each other. In this case, when the clamp arms 11a and 11b are formed so that the ratio R is greater than 1/5, when one conductor of the plurality of conductors 400 arranged side by side at a narrow interval is clamped, it is difficult to insert the distal end portions 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 and 11b are formed so that the ratio R is smaller than 1/6, the separation distance D102 is excessively long in a state where the control rod 30a is maximally pressed and the distal end portions 21a and 21b are maximally separated from each other, and when a plurality of conductors 400 are arranged at narrow intervals, there is a possibility that the plurality of conductors 400 are clamped, and therefore, it is necessary to adjust the amount of pressing of the control rod 30a, and the operability may be deteriorated. In contrast, according to the clamp sensor 2, the clamp arms 11a and 11b are formed such that the facing distance D1 is in the range of 1/6 to 1/5 of the separation distance D102, and the distal end portions 21a and 21b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 in the state where the control rod 30a is maximally pushed in, so that the operability can be sufficiently improved, and only one of the plurality of conductors 400 can be more reliably clamped.
The configuration of the clamp sensor and the measuring device is not limited to the above configuration. The above description has been made of an example in which, for example, only the distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed so that the outer shape of the cross-sectional surface Sc1 is octagonal, the length L2 of the sides E3, E4 of the octagon is longer than the length L1 of the sides E1, E2, and the proximal end side portions 52a, 52b of the clamp arms 11a, 11b are formed so as to have a substantially rectangular cross-section, but both the distal end side portions 51a, 51b and the proximal end side portions 52a, 52b of the clamp arms 11a, 11b may be formed in the above-described shapes. With the above configuration, both the distal end portions 51a and 51b and the proximal end portions 52a and 52b of the clamp arms 11a and 11b can be easily inserted into a narrow gap.
Further, both the distal end side portions 51a and 51b and the proximal end side portions 52a and 52b of the clamp arms 11a and 11b may be formed so that the sides E3 and E4 are formed in a curved line (arc shape).
In addition, although the example in which the end portion side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the sides E1 and E2 of the octagon, which is the outer shape of the cut-out plane Sc1, have the same length L1 and the sides E3 and E4 have the same length L2 has been described above, the end portion side portions 51a and 51b of the clamp arms 11a and 11b (or both of the end portion side portions 51a and 51b and the base portion side portions 52a and 52 b) may be formed so that the lengths of the sides E1 and E2 are different and the lengths of the sides E3 and E4 are different.
In the above description, the example in which the distal end side portions 51a and 551b of the clamp arms 11a and 11b are formed so that the length L2 of all the sides E3 and E4 is longer than the length L1 of the sides E1 and E2 has been described, but the lengths of the sides E1, E2, E3, and E4 can be arbitrarily determined as long as the condition that the length of at least one of the sides E3 and E4 is longer than the shortest one of the lengths of the sides E1 and E2 is satisfied.
In the above, the description has been given of the example in which the clamp arms 11a and 11b are formed so that the facing distance D1a of the facing surfaces 101 at the distal end portions 21a and 21b is shorter than the facing distance D1b of the facing surfaces 101 at the other portions of the clamp arms 11a and 11b than the distal end portions 21a and 21b by cutting off a part of the outer peripheral side at the top portion 100a (the part indicated by the broken line in fig. 8) of the annular body 100, but a structure may be employed in which a part of the outer peripheral side at the top portion 100a (the part indicated by the broken line in fig. 8) is not cut off.
Although the above description has been given of an example in which the clamp sensor 2 detects the magnetic field, which is the detected amount, and the processing unit 33 measures the current, which is the measured amount, the detected amount and the measured amount are not limited to the magnetic field and the current, and include various physical amounts such as voltage, power, and resistance.
Further, a clamp meter 1A including the clamp sensor 2A and the body portion 3 shown in fig. 13 may be used. In the following description, the same components as those of the clamp sensor 2 and the clamp table 1 are denoted by the same reference numerals, and redundant description thereof is omitted.
In the caliper sensor 2A, the distal end side portions 51a and 51b and the proximal end side portions 52A and 52b are defined as follows. First, as shown in fig. 13, a straight line H2 passing through the center C2 of a top portion 100a of the annular body 100 and the inner periphery of the annular body 100 in a plan view (a hatched figure in the same drawing) is defined. Next, a length corresponding to 40% of a distance D101A (linear distance) from the top portion 100a (specifically, an outer side opposing surface 101 of the top portion 100a shown in fig. 8) to the center C2 is determined as a length L101A, and an arbitrary point within a range of a length L101A centered on the center C2 on the straight line H2 is defined (hereinafter, also referred to as "defined point P101A"). In this case, in the present example, a point separated from the centroid C2 toward the apex 100a by a length corresponding to 14% of the distance D101 is defined as the predetermined point P101A. Next, a plane passing through the predetermined point P101A and orthogonal to the straight line H2 is defined as a boundary surface Sb2, a portion between the boundary surface Sb2 and the distal end portions 21a, 21b of the clamp arms 11a, 11b is defined as distal end portion side portions 51a, 51b, and a portion between the boundary surface Sb1 and the proximal end portions 22a, 222b is defined as proximal end portion side portions 52a, 52 b.
In the caliper sensor 2A, as shown in fig. 7, the distal end portions 51a and 51b of the clamp arms 11a and 11b have the same shape as the same portions of the caliper sensor 2. In the caliper sensor 2A, as shown in fig. 6, the clamp arms 11a and 11b are formed so that an outer area Sa1 of a cut Sc1 at the distal end side portions 51a and 51b is smaller than an outer area Sa2 of a cut Sc2 at the proximal end side portions 52A and 52 b. Therefore, according to the clamp sensor 2A, the distal ends 21a and 21b of the clamp arms 11a and 1b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a and 11b, as in the clamp sensor 2. Therefore, the clamp sensor 2 can reliably clamp the conductor 400.
In the caliper sensor 2A, as shown in fig. 8, the clamp arms 11a and 11b are formed such that a length L103 along a straight line H1 between a position P, which is a position separated by 15mm from the center of the top portion 100a in a direction perpendicular to the straight line H1 and parallel to the opening surface F of the ring body 100, and the outer facing surface 101 of the ring body 100 is in a range of 9mm to 11 mm. Therefore, according to the clamp sensor 2A, the conductor 400 can be more reliably clamped while the detection characteristics of the magnetic field are maintained in a satisfactory manner as in the clamp sensor 2.
Further, the clamp sensor 2A is also formed with clamp arms 11a, 11b as shown in fig. 9: when the longest distance among the linear distances between any two points in the outer shape of the cut surface Sc1 at the distal end portions 51a, 51b is set as a relative distance D1 (see also fig. 7), and the distance separating the distal ends 21a, 21b of the clamp arms 11a, 11b from each other in the state where the distal ends 21a, 21b are maximally separated from each other is set as a separation distance D102, the ratio R of the relative distance D1 to the separation distance D102 is in the range of 1/6 to 1/5. Therefore, according to the clamp sensor 2A, the distal end 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 control rod 30a is maximally pushed, as in the clamp sensor 2, so that the operability can be sufficiently improved, and only one of the plurality of conductors 400 can be more reliably clamped.
Further, the clamp sensor 202 shown in fig. 7 may be used. In the clamp sensor 202, as in the clamp sensor 2 described above, the distal end side portions 51a and 51b of the clamp arms 11a and 11b have the pair of opposing surfaces 101, the pair of opposing surfaces 102, the pair of opposing surfaces 103, and the pair of opposing surfaces 104, and as shown in the same drawing, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in a shape of, for example, an octagon (an example of a substantially octagon) in which the outer shape of the cross-section Sc1 is orthogonal to the longitudinal direction of the clamp arms 11a and 11b (an octagon shape in which each corner portion of a quadrangular prism shown by a broken line in the same drawing is chamfered).
In the caliper sensor 202, as shown in fig. 5, similarly to the caliper sensor 2, the portions between the boundary surface Sb1 and the distal end portions 21a and 21b are defined as distal end side portions 51a and 51b, and the portions between the boundary surface Sb1 and the proximal end portions 22a and 22b are defined as proximal end side portions 52a and 52b, wherein the boundary surface Sb1 passes through a predetermined point P101 defined within a range of a length L101 centered on a center C1 on a straight line H1 and is orthogonal to the straight line H1. As shown in fig. 13, the following configuration may be adopted similarly to the caliper sensor 2A: a region between the boundary surface Sb2 and the distal end portions 21a, 21b is defined as distal end portion side regions 51a, 51b, and a region between the boundary surface Sb2 and the proximal end portions 22a, 22b is defined as proximal end portion side regions 52a, 52b, wherein the boundary surface Sb2 passes through a predetermined point P101A defined within a range of a length L101A centered on a center C2 on a straight line H2 and is orthogonal to the straight line H2.
In addition, in the caliper sensor 202, as shown in fig. 7, the portions other than the distal end portions 21a and 21b of the distal end portion side portions 51a and 51b of the clamp arms 11a and 11b are formed as follows: of the octagonal sides of the cross-section Sc1, the sides E1 corresponding to the opposing surfaces 101 and the sides E2 corresponding to the opposing surfaces 102 have the same length L1, and the sides E3 corresponding to the opposing surfaces 103 and the sides E4 corresponding to the opposing surfaces 104 have the same length L2. In the caliper sensor 202, the distal end portions 51a and 51b are formed as follows: 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 (the relative distance between the line segment connecting both end portions of one side of each side E3 and the line segment connecting both end portions of the other side of each side E3) and the relative distance D4 of each side E4 (the relative distance between the line segment connecting both end portions of one side of each side E4 and the line segment connecting both end portions of the other side of each side E4) are the same. In the caliper sensor 202, the distal end portions 51a and 51b are formed such that the relative distances D3 and D4 are greater than (100/√ 2)% of the relative distances D1 and D2 (any shorter distance of the relative distances D1 and D2) and are not more than 110% (99% as an example) of the relative distances D1 and D2 (any shorter distance of the relative distances D1 and D2).
In this case, in a configuration in which the relative distances D3, D4 are set to (100/√ 2)% or less of the relative distances D1, D2, the shape of the cut-off surface Sc1 is a thin shape (a longitudinally long or laterally long shape), and the core 41 is also thin along with this, so that the magnetic characteristics may be deteriorated and the detection accuracy of the detected amount may be lowered. On the other hand, in the structure in which the relative distances D3, D4 are longer than 110% of the relative distances D1, D2, it is difficult to sufficiently exhibit the effects described later by shortening the relative distances D3, D4. Therefore, in the caliper sensor 202, in order to maintain the detection accuracy of the detected amount to be high and sufficiently exhibit the effect of shortening the relative distances D3 and D4, the relative distances D3 and D4 are set to be in the range of greater than (100/√ 2)% of the relative distances D1 and D3 and less than or equal to 110% of the relative distances D1 and D3.
In the example shown in fig. 7, since each side E3 is a straight line, the relative distance between the line segment connecting the two end portions of one side of each side E3 and the line segment connecting the two end portions of the other side of each side E3 is the same as the relative distance D3 of each side E3, but a configuration may be adopted in which each side E3 is a curved line (arc) (the cross-sectional surface Sc1 has a configuration that is approximately octagonal), and in this configuration, the respective front side portions 51a, 51b are formed such that the relative distance between the line segment connecting the two end portions of one side of each side E3 and the line segment connecting the two end portions of the other side of each side E3 is the relative distance D3, and the relative distance D3 is within a range of greater than (100 √ 2)% of the relative distances D1, D2 and 110% or less of the relative distances D1, D2. Similarly, in the example shown in the same drawing, since each side E4 is a straight line, the relative distance between the line segment connecting one end of each side E4 and the line segment connecting the other end of each side E4 is the same as the relative distance D4 of each side E4, but a structure in which each side E4 is a curved line (arc) (the cross-sectional surface Sc1 has an approximately octagonal shape) may be employed, in which the relative distance between the line segment connecting one end of each side E4 and the line segment connecting the other end of each side E4 is set to the relative distance D4, and the relative distance D4 is in a range of greater than (100/√ 2)% of the relative distances D1, D2 and less than or equal to 110% of the relative distances D1, D2.
In addition, in the caliper sensor 202, as shown in fig. 7, the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are formed such that: the thickness T of each portion corresponding to each of the distal end portions 51a, 51b (hereinafter, also referred to as "the portion on the distal end side of the sensor housings 10a, 10 b") is uniform (or substantially uniform) as viewed from the cut surface Sc 1.
In addition, in the caliper sensor 202, as shown in fig. 6, the clamp arms 11a and 11b are formed such that: the proximal end portions 52a, 52b of the clamp arms 11a, 11b are formed in a substantially rectangular shape in cross section, and the outer shape of the cut surfaces Sc2 of the proximal end portions 52a, 52b has an area Sa2 larger than the outer shape area Sa1 of the cut surfaces Sc1 of the distal end portions 51a, 51b (the area Sa1 is smaller than the area Sa 2).
In the caliper sensor 202, as shown in fig. 8, the opposing surface 101 constituting the outer peripheral surface of the annular body 100 at the distal end portions 21a and 21b of the clamp arms 11a and 11b is formed as a single plane orthogonal to the direction connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100 in the state where the annular body 100 is formed. In the caliper sensor 202, the clamp arms 11a and 11b are formed as follows: the facing distance D1a of the facing surfaces 101 at the distal end portions 21a, 21b is shorter than the facing distance D1b of the facing surfaces 101 at the other portions of the clamp arms 11a, 11b than the distal end portions 21a, 21 b. Therefore, in the caliper sensor 202, the length of the annular body 100 along the direction connecting the apex portion 100a and the base end portion 100b is reduced in accordance with the reduction in the facing distance D1a between the facing surfaces 101 at the distal end portions 21a and 21 b.
Here, as shown by the broken lines in fig. 7, in the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cut surface Sc1 at the distal end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a quadrangular shape, the outer shape of the cut surface Sc1, that is, the distance between the opposing corners in the quadrangular shape (the diagonal distance D5 shown in the same drawing) is about 141% of the opposing distance D1 of each side E1 and the opposing distance D2 of each side E2 (in the case where the cut surface Sc1 is square). Therefore, in the conventional configuration, 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, it is difficult to insert the distal end portions 21a and 21b of the clamp arms 11a and 11b into the gaps G1 and G2 when the clamp watch 1 is tilted.
In contrast, in the caliper sensor 202 and the caliper gauge 1 including the caliper sensor 202, as described above, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed as follows: the relative distance D3 of each side E3 (or the relative distance D3 of a line segment connecting both end portions of one side of each side E3 and a line segment connecting both end portions of the other side of each side E3) and the relative distance D4 of each side E4 (or the relative distance D4 of a line segment connecting both end portions of one side of each side E4 and a line segment connecting both end portions of the other side of each side E4) constituting the outer shape of the cut-off surface Sc1 are within a range of (100/√ 2)% of the relative distance D1 of each side E1 and the relative distance D2 of each side E2 and within 110% or less of the relative distance D1 of each side E1 and the relative distance D2 of each side E2. Therefore, according to the clamp sensor 202 and the clamp meter 1, the relative distances D3, D4 can be made sufficiently shorter than the diagonal distance D5 of the cut surface Sc1 in the conventional configuration, and therefore, the distal end portions 21a, 21b of the clamp arms 11a, 11b can be easily inserted into the narrow gaps G1, G2 (see fig. 10 to 12) in a state where the clamp meter 1 is tilted, as compared with the conventional configuration. Therefore, according to the clamp sensor 202 and the clamp meter 1, even when another conductor 400 or an obstacle is present near the conductor 400 to be clamped, the conductor 400 to be clamped can be reliably clamped.
Further, according to the clamp sensor 202 and the clamp table 1, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so that both the relative distances D3 and D4 (or both the relative distance D3 of the line segment connecting both end portions of one side of the side E3 and the line segment connecting both end portions of the other side of the side E3, and both the relative distance D4 of the line segment connecting both end portions of one side of the side E4 and the line segment connecting both end portions of the other side of the side E4) are within a range of (100/√ 2)% of the relative distances D2 and D3 and 110% or less of the relative distances D2 and D3, and therefore, both the relative distances D3 and D4 can be made sufficiently shorter than the diagonal distance D5 of the cut-off surface Sc1 in the conventional structure. Therefore, according to the clamp sensor 202 and the clamp meter 1, even when the clamp meter 1 is tilted by rotating the clamp meter 1 in either of the right-handed rotation direction and the left-handed rotation direction about the longitudinal direction of the clamp meter 1, for example, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2.
In the caliper sensor 202 and the caliper table 1, the clamp arms 11a and 11b are formed so that the thickness T of the portions on the distal end side of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b is uniform (or substantially uniform) when viewed from the cut plane Sc1, and therefore, compared to a structure in which the thickness T of the portions on the distal end side of the sensor housings 10a and 10b is not uniform, stress concentration in the portions where the thickness T of the sensor housings 10a and 10b is small can be avoided, and the strength of the sensor housings 10a and 10b can be improved, and therefore, breakage of the sensor housings 10a and 10b when a load acts on the sensor housings 10a and 10b can be reliably prevented.
In the clamp sensor 202 and the clamp meter 1, the clamp arms 11a and 11b are formed such that the area of the cut surface Sc2 of the proximal end portions 52a and 52b is larger than the area of the cut surface Sc1 of the distal end portions 51a and 51b, whereby the strength of the clamp arms 11a and 11b can be sufficiently increased as compared with a structure in which the clamp arms 11a and 11b are formed such that the area of the cut surface Sc1 of the distal end portions 51a and 51b is the same as the area of the cut surface Sc2 of the proximal end portions 52a and 52 b.
In the caliper sensor 202, as described above, the clamp arms 11a and 11b are formed so that the outer area Sa1 of the cut surface Sc1 of the distal end side portions 51a and 51b is smaller than the outer area Sa2 of the cut surface Sc2 of the proximal end side portions 52a and 52b (see fig. 6). Therefore, according to the clamp sensor 202, the distal ends 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a and 11b, as in the clamp sensor 2. Therefore, the clamp sensor 202 can reliably clamp the conductor 400.
In the caliper sensor 202, as shown in fig. 8, the clamp arms 11a and 11b are formed such that a length L103 along a straight line H1 between a position P, which is separated by 15mm from the center of the top portion 100a in a direction perpendicular to the straight line H1 and parallel to the opening surface F of the ring body 100, and the outer facing surface 101 of the ring body 100 is in a range of 9mm to 11 mm. Therefore, according to the clamp sensor 202, as in the clamp sensor 2, the conductor 400 can be clamped more reliably while the detection characteristics of the magnetic field are maintained well.
Further, the clamp sensor 202 is also formed as shown in fig. 9 as clamp arms 11a and 11 b: when the longest distance among the linear distances between any two points in the outer shape of the cut surface Sc1 at the distal end portions 51a, 51b is set as a facing distance D1 (see also fig. 7), and the distance separating the end portions 21a, 21b of the clamp arms 11a, 11b from each other in the state where the distal end portions 21a, 21b are maximally separated from each other is set as a separating distance D102, the ratio R of the facing distance D1 to the separating distance D102 is in the range of 1/6 to 1/5. Therefore, according to the clamp sensor 202, as in the clamp sensor 2, the distal end 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 control rod 30a is maximally pushed, so that the operability can be sufficiently improved, and only one of the plurality of conductors 400 can be more reliably clamped.
In the caliper sensor 202 and the caliper gauge 1, the clamp arms 11a and 11b are formed as follows: the outer peripheral facing surfaces 101 at the distal end portions 21a, 21b of the clamp arms 11a, 11b are formed as a single plane perpendicular to the direction of the distal end portion 100a and the proximal end portion 100b of the connecting ring body 100 in the formed state of the ring body 100, and the facing distance D1a of the facing surfaces 101 at the distal end portions 21a, 21b is shorter than the facing distance D1b of the facing surfaces 101 at the other portions of the clamp arms 11a, 11b than the distal end portions 21a, 21b, whereby the distal end portions 21a, 21b of the clamp arms 11a, 11b can be inserted into the narrow gaps G1, G2 more easily. Further, since the facing distance D1a of the facing surfaces 101 at the distal end portions 21a and 21b is short, even when an obstacle such as a wall is present behind the conductor 400 to be clamped and the gap between the conductor 400 and the obstacle is narrow, for example, the conductor 400 to be clamped can be reliably clamped while avoiding the obstacle from contacting the clamping arms 11a and 11 b.
In the caliper sensor 202, the proximal end portions 52a and 52b of the clamp arms 11a and 11b may be formed in the same shape as the distal end portions 51a and 51 b. In the clamp sensor 202, the sides E1 and E2 of the octagon, which is the outer shape of the cut-out plane Sc1, may be different in length, and the sides E3 and E4 may be different in length. In the clamp sensor 202, the relative distances D1 and D2 may be different from each other, and the relative distances D3 and D4 may be different from each other. In the caliper sensor 202, the distal end portions 51a and 51b may be configured such that only one of the relative distances D3 and D4 is set to be within a range of greater than (100/√ 2)% of the relative distances D1 and D2 (any shorter one of the relative distances D1 and D2) and less than or equal to 110% of the relative distances D1 and D2 (any shorter one of the relative distances D1 and D2). In the caliper sensor 202, both the distal end side portions 51a and 51b and the proximal end side portions 52a and 52b of the clamp arms 11a and 11b may be formed so that the sides E3 and E4 are curved (arc-shaped). In addition, in the caliper sensor 202, a part (a portion indicated by a broken line in fig. 8) of the outer periphery side of the top portion 100a of the ring body 100 may not be cut off.
Further, the clamp sensor 302 shown in fig. 7 may be used. In the clamp sensor 302, as in the clamp sensor 2 described above, the distal end side portions 51a and 51b of the clamp arms 11a and 11b have the pair of opposing surfaces 101, the pair of opposing surfaces 102, the pair of opposing surfaces 103, and the pair of opposing surfaces 104, and as shown in the same drawing, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in a shape of, for example, an octagon (approximate octagon) in which the outer shape of the cross-section Sc1 is orthogonal to the longitudinal direction of the clamp arms 11a and 11b (an octagon column shape in which each corner portion of a quadrangular column shown by a broken line in the same drawing is chamfered).
In the caliper sensor 302, as shown in fig. 5, similarly to the caliper sensor 2, the portions between the boundary surface Sb1 and the distal end portions 21a and 21b are defined as distal end side portions 51a and 51b, and the portions between the boundary surface Sb1 and the proximal end portions 22a and 22b are defined as proximal end side portions 52a and 52b, wherein the boundary surface Sb1 passes through a predetermined point P101 defined within a range of a length L101 centered on a center C1 on a straight line H1 and is orthogonal to the straight line H1. As shown in fig. 13, the following configuration may be adopted similarly to the caliper sensor 2A: a region between the boundary surface Sb2 and the distal end portions 21a, 21b is defined as distal end portion side regions 51a, 51b, and a region between the boundary surface Sb2 and the proximal end portions 22a, 22b is defined as proximal end portion side regions 52a, 52b, wherein the boundary surface Sb2 passes through a predetermined point P101A defined within a range of a length L101A centered on a center C2 on a straight line H2 and is orthogonal to the straight line H2.
In addition, in the caliper sensor 302, as shown in fig. 7, the portions other than the distal end portions 21a and 21b of the distal end portion side portions 51a and 51b of the clamp arms 11a and 11b are formed as follows: of the octagonal sides of the cross-section Sc1, the sides E1 corresponding to the opposing surfaces 101 and the sides E2 corresponding to the opposing surfaces 102 have the same length L1, and the sides E3 corresponding to the opposing surfaces 103 and the sides E4 corresponding to the opposing surfaces 104 have the same length L2. In the caliper sensor 302, the distal end portions 51a and 51b are formed as follows: the length L2 of each side E3, E4 is within a range of 57% or more and less than 1000% (106% as an example) of the length L1 of each side E1, E2 (the shortest length of the lengths of the sides E1, E2).
In this case, in a configuration in which the length L2 is set to 1000% or more of the length L1, the shape of the cut surface Sc1 is formed to be thin (a shape that is long in the longitudinal direction or long in the lateral direction), and along with this, the core 41 is also thin, and therefore, magnetic characteristics may deteriorate, and detection accuracy of the detected amount may decrease. On the other hand, in the structure in which the length L2 is less than 57% of the length L1, it is difficult to sufficiently exhibit the effect described later that the length L2 is increased to some extent by chamfering each corner of the quadrangular prism. Therefore, in the caliper sensor 2, in order to maintain the detection accuracy of the detected amount to be high and sufficiently exhibit the effect of increasing the length L2 to some extent, the length L2 is set to be in the range of 57% or more and less than 1000% of the length L1.
In the example shown in fig. 7, since the sides E3 and E4 are straight lines, the length of the line segment connecting the both ends of E3 and E4 is the same as the length of the sides E3 and E4, but a structure in which the sides E3 and E4 are curved (arc-shaped) (the outer shape of the cut surface Sc1 is a structure that is substantially octagonal) may be employed, and the respective distal end portions 51a and 51b are formed such that the length of the line segment connecting the both ends of the sides E3 and E4 is the length L2 and the length L2 is within a range of 57% to less than 1000% of the length L1 (the shortest length of the lengths of the sides E1 and E2).
In addition, in the caliper sensor 302, as shown in fig. 7, the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are formed such that: the thickness T of each portion corresponding to each of the distal end portions 51a, 51b (hereinafter, also referred to as "the portion on the distal end side of the sensor housings 10a, 10 b") is uniform (or substantially uniform) as viewed from the cut surface Sc 1.
In the clamp sensor 302, the clamp arms 11a and 11b may be formed such that the proximal end portions 52a and 52b of the clamp arms 11a and 11b have a substantially rectangular cross section and the area of the cut surface Sc2 of the proximal end portions 52a and 52b is larger than the area of the cut surface Sc1 of the distal end portions 51a and 51b (the area Sa1 is smaller than the area Sa 2).
In the caliper sensor 302, as shown in fig. 8, the facing 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 so as to be a single plane perpendicular to the direction connecting the distal end portion 100a and the proximal end portion 100b of the annular body 100 in the state where the annular body 100 is formed. As described above, in the caliper sensor 302, the clamp arms 11a and 11b are formed such that: the facing distance D1a of the facing surfaces 101 at the distal end portions 21a, 21b is shorter than the facing distance D1b of the facing surfaces 101 at the other portions of the clamp arms 11a, 11b than the distal end portions 21a, 21 b. Therefore, in the caliper sensor 302, the length of the annular body 100 along the direction connecting the apex portion 100a and the base end portion 100b is reduced in accordance with the reduction in the facing distance D1a between the facing surfaces 101 at the distal end portions 21a and 21 b.
Here, as shown by the broken line in fig. 7, in the conventional structure (the structure in which the corners of the quadrangular prism are not chamfered) in which the outer shape of the cut surface Sc1 at the distal end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a quadrangular shape, the outer shape of the cut surface Sc1, that is, the distance between the corners opposing each other in the quadrangular shape (the diagonal distance D5 shown in the same drawing) is longer than the opposing distance D1 of each side E1 and the opposing distance D2 of each side E2. Therefore, in the conventional configuration, 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, it is difficult to insert the distal end portions 21a and 21b of the clamp arms 11a and 11b into the gaps G1 and G2 when the clamp watch 1 is tilted.
In contrast, in the caliper sensor 302 and the caliper gauge 1 including the caliper sensor 302, as described above, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed as follows: the length L2 of each of the sides E3 and E4 (or the length L2 of a line segment connecting both end portions of the sides E3 and E4) constituting the external shape (octagonal shape or approximately octagonal shape in this example) of the cross-section Sc1 obtained by chamfering each corner portion of the quadrangular prism is within a range of 57% or more and less than 1000% of the length L1 of each of the sides E1 and E2. Therefore, according to the clamp sensor 302 and the clamp meter 1, since the length L2 is increased to some extent, the relative distances D3 and D4 can be made sufficiently shorter than the relative distance D5 of the cut-out surface Sc1 in the conventional structure, and therefore, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 (see fig. 10 to 12) in a state where the clamp meter 1 is tilted, as compared with the conventional structure. Therefore, according to the clamp sensor 302 and the clamp meter 1, even when another conductor 400 or an obstacle is present near the conductor 400 to be clamped, the conductor 400 to be clamped can be reliably clamped.
Further, according to the clamp sensor 302 and the clamp meter 1, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed such that the length L2 of all the sides E3 and E4 (or the length L2 of all line segments connecting both end portions of the sides E3 and E4) is within a range of 57% or more and less than 1000% of the length L1 of the sides E1 and E2, and therefore, both the facing distances D3 and D4 can be made sufficiently shorter than the facing distance D5 of the cut surface Sc1 of the conventional structure. Therefore, according to the clamp sensor 302 and the clamp meter 1, even when the clamp meter 1 is tilted by rotating the clamp meter 1 in either of the right-handed rotation direction and the left-handed rotation direction about the longitudinal direction of the clamp meter 1, for example, the distal end portions 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2.
In the caliper sensor 302 and the caliper table 1, the clamp arms 11a and 11b are formed so that the thickness T of the portions on the front end side of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b is uniform (or substantially uniform) when viewed from the cut plane Sc1, and therefore, compared to a structure in which the thickness T of the portions on the front end side of the sensor housings 10a and 10b is not uniform, stress concentration in the portions where the thickness T of the sensor housings 10a and 10b is small can be avoided, and the strength of the sensor housings 10a and 10b can be improved, and therefore, breakage of the sensor housings 10a and 10b when a load acts on the sensor housings 10a and 10b can be reliably prevented.
In the clamp sensor 302 and the clamp meter 1, the clamp arms 11a and 11b are formed such that the area of the cut surface Sc2 of the proximal end portions 52a and 52b is larger than the area of the cut surface Sc1 of the distal end portions 51a and 51b, whereby the strength of the clamp arms 11a and 11b can be sufficiently increased as compared with a structure in which the clamp arms 11a and 11b are formed such that the area of the cut surface Sc1 of the distal end portions 51a and 51b is the same as the area of the cut surface Sc2 of the proximal end portions 52a and 52 b.
In the caliper sensor 302, as described above, the clamp arms 11a and 11b are formed so that the outer area Sa1 of the cut Sc1 at the distal end side portions 51a and 51b is smaller than the outer area Sa2 of the cut Sc2 at the proximal end side portions 52a and 52b (see fig. 6). Therefore, according to the clamp sensor 302, the distal ends 21a and 21b of the clamp arms 11a and 11b can be easily inserted into the narrow gaps G1 and G2 between the adjacent conductors 400 without reducing the strength of the clamp arms 11a and 11b, as in the clamp sensor 2. Therefore, the clamp sensor 302 can reliably clamp the conductor 400.
In the caliper sensor 302, as shown in fig. 8, the clamp arms 11a and 11b are formed such that a length L103 along a straight line H1 between a position P, which is separated by 15mm from the center of the top portion 100a in a direction perpendicular to the straight line H1 and parallel to the opening surface F of the ring body 100, and the outer facing surface 101 of the ring body 100 is in a range of 9mm to 11 mm. Therefore, according to the clamp sensor 302, as in the clamp sensor 2, the conductor 400 can be clamped more reliably while the detection characteristics of the magnetic field are maintained well.
Further, as shown in fig. 9, the clamp sensor 302 is also formed with clamp arms 11a and 11 b: when the longest distance among the linear distances between any two points in the outer shape of the cut surface Sc1 at the distal end portions 51a, 51b is set as a facing distance D1 (see also fig. 7), and the distance separating the end portions 21a, 21b of the clamp arms 11a, 11b from each other in the state where the distal end portions 21a, 21b are maximally separated from each other is set as a separating distance D102, the ratio R of the facing distance D1 to the separating distance D102 is in the range of 1/6 to 1/5. Therefore, according to the clamp sensor 302, as in the clamp sensor 2, the distal end 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 control rod 30a is maximally pushed, so that the operability can be sufficiently improved, and only one of the plurality of conductors 400 can be more reliably clamped.
In the clamp sensor 302 and the clamp meter 1, the clamp arms 11a and 11b are formed as follows: the outer peripheral facing surfaces 101 at the distal end portions 21a, 21b of the clamp arms 11a, 11b are formed as a single plane perpendicular to the direction of the distal end portion 100a and the proximal end portion 100b of the connecting ring body 100 in the formed state of the ring body 100, and the facing distance D1a of the facing surfaces 101 at the distal end portions 21a, 21b is shorter than the facing distance D1b of the facing surfaces 101 at the other portions of the clamp arms 11a, 11b than the distal end portions 21a, 21b, whereby the distal end portions 21a, 21b of the clamp arms 11a, 11b can be inserted into the narrow gaps G1, G2 more easily. Further, since the facing distance D1a of the facing surfaces 101 at the distal end portions 21a and 21b is short, even when an obstacle such as a wall is present behind the conductor 400 to be clamped and the gap between the conductor 400 and the obstacle is narrow, for example, the conductor 400 to be clamped can be reliably clamped while avoiding the obstacle from contacting the clamping arms 11a and 11 b.
In the caliper sensor 302, the proximal end portions 52a and 52b of the clamp arms 11a and 11b may be formed in the same shape as the distal end portions 51a and 51 b. In the clamp sensor 302, the sides E1 and E2 of the octagon, which is the outer shape of the cut-off plane Sc1, may be different in length, and the sides E3 and E4 may be different in length. In the caliper sensor 302, the lengths of the sides E1, E2, E3, and E4 can be arbitrarily defined as long as the condition that the length of at least one of the sides E3 and E4 is within a range of 57% or more and less than 100% of the shortest length of the lengths of the sides E1 and E2 is satisfied. In the caliper sensor 302, both the distal end side portions 51a and 51b and the proximal end side portions 52a and 52b of the clamp arms 11a and 11b may be formed so that the sides E3 and E4 are curved (arc-shaped). In addition, in the caliper sensor 302, a part (a portion indicated by a broken line in fig. 8) of the outer periphery side of the top portion 100a of the ring body 100 may not be cut off.
Although the examples in which the distal end side portions 51a and 51b are formed such that the outer shape of the cut surface Sc1 of the distal end side portions 51a and 51b of the clamp arms 11a and 11b is substantially octagonal have been described above, the distal end side portions 51a and 51b may be formed such that the outer shape of the cut surface Sc1 is formed into a polygonal shape other than substantially octagonal (for example, substantially dodecagonal shape or substantially hexadecagonal shape). As an example, the clamp sensor 402 shown in fig. 14 can be used.
In the caliper sensor 402, the distal end side portions 51a and 51b of the clamp arms 11a and 11b have a pair of opposing surfaces 101 corresponding to the first opposing surfaces, a pair of opposing surfaces 102 corresponding to the second opposing surfaces, a pair of opposing surfaces 103a inclined with respect to the opposing surfaces 101 and 102, a pair of opposing surfaces 103b, a pair of opposing surfaces 104a, and a pair of opposing surfaces 104b (each corresponding to the third opposing surfaces, and four pairs of third opposing surfaces in total are provided as an example of the plurality of pairs), and the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in a shape of an approximately dodecagon in an outer shape of a cross-sectional surface Sc1 orthogonal to the longitudinal direction of the clamp arms 11a and 11 b. Since the respective distal end portions 51a and 51b have the same cross-sectional shape, only the cross-sectional shape of the distal end portion 51a is shown in the same drawing, and the cross-sectional shape of the distal end portion 51b is not shown.
In addition, in the caliper sensor 402, as shown in fig. 14, the portions other than the distal end portions 21a and 21b of the distal end portion side portions 51a and 51b of the clamp arms 11a and 11b are formed as follows: of the dodecagon which is 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 have the same length L1, and the length of each side E3a, E3b corresponding to each opposing surface 103a, 103b (the length of a line segment connecting both end portions of each side E3a, E3 b) and the length of each side E4a, E4b corresponding to each opposing surface 104a, 104b (the length of a line segment connecting both end portions of each side E4a, E4 b) are the same length L2. In the caliper sensor 402, the distal end side portions 51a and 51b are formed so that the length L2 is longer than the length L1 (the shortest length of the sides E1 and E2).
In addition, in the caliper sensor 402, as shown in fig. 14, the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are formed such that: the thickness T of each portion corresponding to each of the distal end portions 51a, 51b (hereinafter, also referred to as "the portion on the distal end side of the sensor housings 10a, 10 b") is uniform (or substantially uniform) as viewed from the cut surface Sc 1. Therefore, in the caliper sensor 402, as compared with the structure in which the thickness T of the portion on the front end side of the sensor housings 10a and 10b is not uniform, the strength of the sensor housings 10a and 10b can be improved while avoiding stress concentration in the portion where the thickness T of the sensor housings 10a and 10b is thin, and 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 10 b.
As shown in fig. 14, the caliper sensor 402 may be formed such that the distal end side portions 51a and 51 b: the relative distance D1 of each side E1 and the relative distance D1 of each side E1 of the dodecagon, which is the outer shape of the cross-section Sc1, are the same distance, the relative distance D3 1, D3 1 of each side E3 1, E3 1 (the relative distance between a line connecting both ends of one side of each side E3 1, E3 1 and a line connecting both ends of the other side of each side E3 1, E3 1) and the relative distance D4 1, D4 1 of each side E4 1, E4 1 (the relative distance between a line connecting both ends of one side of each side E4 1, E4 1 and a line connecting both ends of the other side of each side E4 1, E4 1) are the same distance, and the relative distance D3 1, D4 1 is greater than the relative distance D1, D1 (the relative distance D1, D72, D1) and is a shorter distance (100% of the relative distance D1, 1) and is a shorter distance (1, 1) and a shorter distance is equal to a shorter distance (3672), the above-described respective effects can be achieved.
In the caliper sensor 402, as shown in fig. 14, the respective distal end portions 51a and 51b may be formed such that the length L2 of the respective sides E3a, E3b, E4a, and E4b of the dodecagon, which is the outer shape of the cut-out surface Sc1, is within a range (106% as an example) of 57% or more and less than 1000% of the length L1 of the respective sides E1 and E2 (the shortest length of the lengths of the respective sides E1 and E2).
In addition, when there are three 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 the pair of third opposing surfaces is n, a configuration in which the outer shape of the cut-off surface Sc1 is formed into various polygons approximating a (4+2n) polygon (n is a natural number of 2 or more) can also be applied, and in this case, the above-described respective effects can be achieved.
The distal end portions 51a and 51b may be formed in a shape in which a part of the outer shape of the cut-out surface Sc1 is curved. As an example, the clamp sensor 502 shown in fig. 15 can be used. Since the respective distal end portions 51a and 51b have the same cross-sectional shape, only the cross-sectional shape of the distal end portion 51a is shown in the same drawing, and the cross-sectional shape of the distal end portion 51b is not shown.
In the caliper sensor 502, as shown in fig. 15, the distal end side portions 51a and 51b of the clamp arms 11a and 11b have a pair of opposing surfaces 101 (corresponding to a first opposing surface) that form the outer peripheral surface and the inner peripheral surface of the annular body 100, and a pair of opposing surfaces 102 (corresponding to a second opposing surface) that form both side surfaces of the annular body 100, and the distal end side portions 51a and 51b of the clamp arms 11a and 11b have a shape in which both end portions in the major axis direction of the ellipse are cut away in a direction (the left-right direction in the same drawing) perpendicular to the opening surface F of the annular body 100, in the outer shape of a cut surface Sc1 that is orthogonal to the longitudinal direction of the clamp arms 11a and 11 b. In the caliper sensor 502, among the respective sides constituting the outer shape of the cut surface Sc1, the side E1 corresponding to each opposing surface 101 is formed as a straight line, and the side E2 corresponding to each opposing surface 102 is formed as a curved line curved outward (a shape obtained by chamfering each corner portion of a quadrangular prism indicated by a broken line in the same drawing). In the caliper sensor 502, the distal end portions 51a and 51b of the clamp arms 11a and 11b are formed such that the longest relative distance D6 of the sides E2 in the direction perpendicular to the opening surface F of the ring body 100 is equal to or less than the relative distance D1 of the sides E1. In the caliper sensor 502, the distal end portions 51a and 51b of the clamp arms 11a and 11b are formed in the above-described manner, and the longest relative distances D7 and D8 of the sides E2 are configured to be equal to or less than the relative distance D1 of the sides E1, as shown in the same drawing. In the same drawing, an example in which the relative distance D1 is equal to the relative distances D7 and D8 is shown.
In addition, in the caliper sensor 502, as shown in fig. 15, the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are formed such that: the thickness T of each portion corresponding to each of the distal end portions 51a, 51b (hereinafter, also referred to as "the portion on the distal end side of the sensor housings 10a, 10 b") is uniform (or substantially uniform) as viewed from the cut surface Sc 1.
According to the clamp sensor 502 and the clamp meter 1 including the clamp sensor 502, the distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed so that the sides E1 among the sides forming the outer shape of the cut surface Sc1 are straight lines and the sides E2 are curved lines curved outward, and thus the longest relative distance D7, D8 of the sides E2 can be set to be equal to or less than the relative distance D1 of the sides E1, and therefore, compared to the conventional structure (structure in which the corners of the rectangular prism end portions 21a, 21b of the clamp arms 11a, 11b are not chamfered) in which the outer shape of the cut surface Sc1 of the distal end side portions 51a, 51b of the clamp arms 11a, 11b is formed so that the diagonal distance D5 of the cut surface Sc1 is longer than the relative distance D1 of the sides E1 and the longest relative distances D7, D8 of the sides E2, the front end portions 21a, 11b of the clamp arms 11a, 11b can be inclined in a state that the clamp table 1 is inclined, 21b are easily inserted into the narrower gaps G1, G2. Therefore, according to the clamp sensor 502 and the clamp meter 1, even when another conductor 400 or an obstacle is present near the conductor 400 to be clamped, the conductor 400 to be clamped can be reliably clamped.
In the clamp sensor 502 and the clamp table 1 including the clamp sensor 502, the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed so that the longest relative distance D6 of the sides E2 along the direction perpendicular to the opening surface F of the ring body 100 is equal to or less than the relative distance D1 of the sides E1. Therefore, according to the clamp sensor 502 and the clamp meter 1, the tip end portions 21a and 21b of the clamp arms 11a and 11b can be inserted into the narrow gaps G1 and G2 more easily by tilting the clamp meter 1 so that the tilt angle of the opening surface F of the ring body 100 with respect to the extending direction of the conductor 400 is reduced.
Further, according to the clamp sensor 502 and the clamp meter 1 including the clamp sensor 502, the clamp arms 11a and 11b are formed so that the thickness T of the portions on the front end side of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b is uniform (or substantially uniform) when viewed from the section plane Sc1, and as compared with the structure in which the thickness T of the portions on the front end side of the sensor housings 10a and 10b is not uniform, it is possible to avoid stress concentration in the portions where the thickness T of the sensor housings 10a and 10b is thin, and to improve the strength of the sensor housings 10a and 10b, and 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 10 b.
As another example of the configuration in which the distal end portions 51a and 51b are formed in a shape in which a part of the outer shape of the cut-out plane Sc1 is curved, the clamp sensor 602 shown in fig. 16 can be used. Since the respective distal end portions 51a and 51b have the same cross-sectional shape, only the cross-sectional shape of the distal end portion 51a is shown in the same drawing, and the cross-sectional shape of the distal end portion 51b is not shown.
In the caliper sensor 602, as shown in fig. 16, the distal end side portions 51a and 51b of the clamp arms 11a and 11b have a pair of opposing surfaces 101 (corresponding to a first opposing surface) constituting the outer peripheral surface and the inner peripheral surface of the annular body 100, a pair of opposing surfaces 102 (corresponding to a second opposing surface) constituting both side surfaces of the annular body 100, and two pairs of opposing surfaces 105 (corresponding to a fourth opposing surface) located between the opposing surfaces 101 and the opposing surfaces 102, and the distal end side portions 51a and 51b of the clamp arms 11a and 11b are formed in such a shape that the outer shape of a cross-section Sc1 perpendicular to the longitudinal direction of the clamp arms 11a and 11b is rounded (chamfered) at the corners of a quadrangle. In the caliper sensor 602, among the respective sides constituting the outer shape of the cut surface Sc1, the side E1 corresponding to each opposing surface 101 and the side E2 corresponding to each opposing surface 102 are formed as straight lines, and the side E5 corresponding to each opposing surface 105 is formed as a curved line curved outward (formed by chamfering each corner portion of a quadrangular prism shown by a broken line in the same drawing into a curved surface shape). In the caliper sensor 602, the distal end portions 51a and 51b of the clamp arms 11a and 11b are formed such that the facing distance D9 of the sides E2 is equal to or less than the facing distance D1 of the sides E1. In the caliper sensor 602, the distal end portions 51a and 51b of the clamp arms 11a and 11b are formed in the above-described manner, and the longest relative distances D10 and D11 of the opposing sides E5 are configured to be equal to or less than the relative distance D1 of the sides E1, as shown in the same drawing. In the same drawing, an example in which the relative distance D1 is equal to the relative distances D10 and D11 is shown.
In addition, in the caliper sensor 602, as shown in fig. 16, the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are formed such that: the thickness T of each portion corresponding to each of the distal end portions 51a, 51b (hereinafter, also referred to as "the portion on the distal end side of the sensor housings 10a, 10 b") is uniform (or substantially uniform) as viewed from the cut surface Sc 1.
According to the clamp sensor 602 and the clamp meter 1 including the clamp sensor 602, the distal end side portions 51a, 51b of the clamp arms 11a, 11b are formed so that the sides E1 and E2 of the respective sides forming the outer shape of the cut surface Sc1 are formed in a straight line and the sides E5 are formed in an outwardly curved line, and thus the longest relative distance D10, D11 of the opposing sides E5 can be set to be equal to or less than the relative distance D1 of the sides E1, and therefore, compared with the conventional structure (the structure in which the corners of the four prisms are not chamfered) formed so that the outer shape of the cut surface Sc1 of the distal end side portions 51a, 51b of the clamp arms 11a, 11b is formed in a quadrangular shape and the diagonal distance D5 of the cut surface Sc1 is longer than the relative distance D1 of the sides E1 and the relative distance D9 of the sides E2, the clamp arms 11a, 11b can be clamped with the front end portions 21a, 11b inclined in the state of the clamp meter 1 being inclined, 21b are easily inserted into the narrower gaps G1, G2. Therefore, according to the clamp sensor 602 and the clamp meter 1, even when another conductor 400 or an obstacle is present near the conductor 400 to be clamped, the conductor 400 to be clamped can be reliably clamped.
In the clamp sensor 602 and the clamp table 1 including the clamp sensor 602, the distal end portions 51a and 51b of the clamp arms 11a and 11b are formed such that the facing distance D9 of the sides E2 is equal to or less than the facing distance D1 of the sides E1. Therefore, according to the clamp sensor 602 and the clamp meter 1, the tip end portions 21a and 21b of the clamp arms 11a and 11b can be inserted into the narrow gaps G1 and G2 more easily by tilting the clamp meter 1 so that the tilt angle of the opening surface F of the ring body 100 with respect to the extending direction of the conductor 400 is reduced.
Further, according to the clamp sensor 602 and the clamp meter 1 including the clamp sensor 602, the clamp arms 11a and 11b are formed so that the thicknesses T of the portions on the front end side of the sensor housings 10a and 10b constituting the housings of the clamp arms 11a and 11b are uniform (or substantially uniform) when viewed from the section plane Sc1, and as compared with a structure in which the thicknesses T of the portions on the front end side of the sensor housings 10a and 10b are not uniform, it is possible to avoid stress concentration in the portions where the thicknesses T of the sensor housings 10a and 10b are thin, and to improve the strength of the sensor housings 10a and 10b, and 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 10 b.
Although the example in which the clamp arm 11b (one of the clamp arms 11a and 11 b) is configured to be rotatable has been described above, the clamp arm 11a may be configured to be rotatable, or both of the clamp arms 11a and 11b may be configured to be rotatable.
Industrial applicability of the invention
According to the present invention, the tip end portions of the clamp arms can be easily inserted into the narrow gaps in a state where the measuring apparatus is tilted, and therefore, even when another conductor or an obstacle is present near the conductor to be clamped, for example, the conductor to be clamped can be reliably clamped. Therefore, the clamp sensor can be widely applied to a clamp sensor for detecting a detected amount of a clamped object and a measuring device for measuring a measured amount of the clamped object.
Description of the symbols
1, a clamp meter;
2. 2A, 202, 302, 402, 502, 602 clamp sensors;
11a, 11b clamp arms;
21a, 21b front end portions;
base ends 22a and 22 b;
23 rotating the shaft;
33 a processing unit;
41 a core body;
51a, 51b front end parts;
52a, 52b on the proximal side;
100 an annular body;
100a top;
400. a 400a conductor;
101-105, 103a, 103b, 104a, 104b opposite faces;
c1, C2 centroid;
relative distance D1-D11;
d102 separation distance;
edges E1-E5, E3a, E3b, E4a and E4 b;
h1, H2 straight line;
l1, L2 length;
l101, L101A, L102, L103 length;
a Mc magnetic circuit;
the P position;
p101, P101A;
sa1, Sa2 area;
the boundary surfaces of Sb1 and Sb 2;
sc1 and Sc2 cutting planes;
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.
CN201980013947.7A 2018-02-19 2019-02-01 Clamp type sensor and measuring device Active CN111742230B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116430101A (en) * 2023-06-13 2023-07-14 云南电网有限责任公司 On-line sampling device for running current
CN116430101B (en) * 2023-06-13 2023-11-10 云南电网有限责任公司 On-line sampling device for running current

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