TW201437643A - Current sensor and power sensor using the same current sensor - Google Patents

Abstract

The invention provides a current sensor that is convenient and easy for mounting and dismounting, thus, a current sensor 1 provided for externally measuring the current circulating around said coated wires 80a, 80b, and 80c. Preferably that it is composed of the following elements: a sensor body 10, having built-in current sensors which are, respectively, juxtaposed with notched insertion grooves 22a, 22b, and 22c capable of inserting at least two wires; and a stoppage base 70, used as a holding means for holding the aforementioned wires 80a, 80b, and 80c inserted into the insertion grooves 22a, 22b, and 22c to the bottom surface of the aforementioned insertion grooves 22a, 22b, and 22c.

Description

Current sensor and power sensor using the same

The present invention relates to a current sensor and a power sensor for measuring power using the current sensor.

Conventionally, as a current sensor, for example, a "converter" having a pair of cores having a split type structure using a material having a high magnetic permeability; and a core of such a core is used a resin case having a through-hole through which a wire can pass through, and a resin case having a water-repellent function, which is not saturated even when a large current of AC1000A is applied, and the measurement accuracy is high. Current detecting device (refer to Citation 1).

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2000-88889

However, since the current detecting device is in the shape of a surrounding electric wire, when the current detecting device is provided, after the electric wire is temporarily removed from the electric device, the current detecting device must be inserted into the electric current line, which is time consuming and labor intensive. Moreover, the aforementioned current detecting device is required to be used for fixing The installation structure of its own, and the problem of additional work is required.

The current sensor of the present invention is directed to providing a current sensor that is simple and easy to install and unload in view of the foregoing problems.

The current sensor of the present invention is a current sensor for externally measuring the current flowing through the covered wire, and is configured to include: a sensor body, a built-in current sensor element and a parallel arrangement separately insertable a notch-shaped insertion groove of at least two of the electric wires; and a holding means for holding the electric wire inserted into the insertion groove on a bottom surface of the insertion groove.

According to the present invention, it is possible to obtain a current sensor which is easy and easy to attach and detach the electric wire via the holding means.

According to an embodiment of the present invention, the width of the insertion groove may be configured to be smaller from the notch-shaped opening toward the bottom surface.

According to this embodiment, by inserting an electric wire into the insertion slot and pushing it in, the electric wire can be accurately positioned at a predetermined position, and a current sensor having high measurement accuracy can be obtained.

In another embodiment of the present invention, the bottom surface of the insertion groove may be located at the same depth.

According to this embodiment, it is convenient to consistently position the electric wires.

According to still another embodiment of the present invention, the bottom surface of the insertion groove may have a circular arc shape.

According to this embodiment, the electric wire can be positioned without looseness, and a current sensor having high measurement accuracy can be obtained.

As a different embodiment of the present invention, the bottom surface of the insertion groove may have a substantially V shape.

According to this embodiment, the electric wire can be positioned without looseness, and a current sensor having high measurement accuracy can be obtained.

According to a new embodiment of the present invention, the holding means may be integrally formed with the sensor body so as to be protruded from at least one of the opposing inner side surfaces of the insertion groove.

According to this embodiment, since the holding means is integrally formed with the sensor body, it is possible to obtain a current sensor having a small number of parts and a small number of assembling steps.

In an embodiment of the present invention, the holding means may include another member that is different from the sensor body.

According to this embodiment, it is possible to diversify the holding means of the electric wire in accordance with the field expectation, and it is possible to obtain a highly versatile current sensor.

According to still another embodiment of the present invention, the holding means may be formed by a binding protrusion that protrudes laterally from an edge portion of the insertion groove, and a cable tie bundle that can be bundled by the binding protrusion.

According to this embodiment, it is possible to obtain a current sensor which is easy to use and can be held by a cable tie which is easy to handle.

According to still another embodiment of the present invention, the holding means may be an elastic holding member that is attached to the sensor body and that can be ejected into and out of the insertion groove, and detachably holds the inserted electric wire.

According to this embodiment, the electric wire can be detachably held in a single step, so that a current sensor having better usability can be obtained.

According to a different embodiment of the present invention, the elastic holding member may be formed of a plurality of elastic J-shaped elastic arms arranged in parallel.

According to the present embodiment, since the elastic holding portion has a substantially J-shape, the electric wire can be easily attached and detached, and a current sensor having better usability can be obtained.

According to a new embodiment of the present invention, the holding means can be provided with a base for the movement, and a pressing protrusion that can be inserted into the insertion groove of each of the sensor bodies can be arranged in parallel and can be fixed to the sensor body.

According to the present embodiment, the electric wire is crimped to the bottom surface of the insertion groove by the pressing protrusion of the base for the stopper, so that a current sensor having high measurement accuracy can be obtained.

According to the embodiment of the present invention, the stopper base may be provided with a pair of elastic support portions that are press-contactable to the electric wires on the upper end surface of the pressing protrusion.

According to the present embodiment, the electric wire is pressed against the bottom surface of the insertion groove by the elastic support portion of the pressing protrusion, and the electric wire is crimped to the predetermined pressure by the elastic support portion of the pressing protrusion. Since the bottom surface of the groove is inserted, it is possible to obtain a current sensor that can avoid a decrease in measurement accuracy due to unevenness in part precision and assembly precision.

In another embodiment of the present invention, the stopper base may be configured to have a pressing member that is vertically movably accommodated in an upper end portion of the pressing protrusion and that is pressed upward by a spring member.

According to the embodiment, the pressing member incorporated in the pressing protrusion is crimped to the electric wire and positioned by the spring member. A current sensor capable of avoiding measurement accuracy due to unevenness in part precision and assembly accuracy is obtained.

According to still another embodiment of the present invention, the stopper base may be formed such that an upper end surface of the pressing member has a circular arc shape.

According to this embodiment, the electric wire can be positioned without looseness, and a current sensor having high measurement accuracy can be obtained.

According to a different embodiment of the present invention, the stopper base may be provided such that an upper end surface of the pressing member has a substantially V shape.

According to this embodiment, the electric wire can be positioned without looseness, and a current sensor having high measurement accuracy can be obtained.

As a new embodiment of the present invention, a display portion may be disposed in advance on the upper surface of the sensor body.

According to this embodiment, since the measurement result can be visually observed, the measurement operation can be performed efficiently at the site.

In order to solve the above problems, the power sensor of the present invention is configured such that a voltage sensor that can measure the voltage of the electric wire is disposed in the sensor body of the current sensor described above, and a control circuit is provided. The control circuit calculates the power value by using the current value measured by the current sensor and the voltage value measured by the voltage sensor.

According to the present invention, it is possible to obtain a power sensor which can measure not only the current but also the voltage and the current, and which is easy and easy to install and remove the electric wire via the holding means.

According to another embodiment of the present invention, in the sensor body of the current sensor described above, a communication port is provided in the sensor element, and a control circuit is provided, and the control circuit is used before The voltage value of the aforementioned electric wire received by the communication port and the current value of the aforementioned electric wire measured by the current sensor are used to calculate the electric power value.

According to this embodiment, it is possible to obtain a power sensor that can measure a wide range of power consumption.

According to another embodiment of the present invention, in the sensor body of the current sensor described above, a storage element for storing a voltage value of the electric wire is provided, and a control circuit is provided, and the control circuit uses the current sense The current value of the aforementioned wire measured by the detector and the voltage value stored by the aforementioned storage element calculate the power value.

According to this embodiment, it is possible to obtain an effect of measuring a power sensor having a wider range of power consumption.

1‧‧‧ Current Sensor

2‧‧‧Manufacture of equipment

3‧‧‧Wire

4‧‧‧Distribution panel

10‧‧‧Sensor body

20‧‧‧ Shell

20a, 20b‧‧‧stop groove

20c‧‧‧ middle wall

21‧‧‧Connecting opening

22a, 22b, 22c‧‧‧ insertion slot

23a, 23b, 23c‧‧‧

24‧‧‧Flexible claws

25a, 26b‧‧‧ support ribs

26‧‧‧Snap hole

27‧‧‧ bearing recess

27a‧‧‧ Bearing projections

27b‧‧‧ bearing groove

30‧‧‧Top cover

31‧‧‧LCD display

40‧‧‧ front cover

41a, 41b, 41c‧‧‧ notch groove

42‧‧‧ Positioned wrists

43‧‧‧ Guided ridges

44‧‧‧Operation display hole

45a, 45b‧‧‧ connection holes

46‧‧‧Steering plate switch

47‧‧‧Activity display hole

48‧‧‧Clamping claws

49‧‧‧Bundle

49a‧‧‧ bearing projections

49b‧‧‧ bearing groove

50, 51‧‧‧Measurement gate type printed circuit board

60‧‧‧Locking members

61‧‧‧operation ribs

62‧‧‧Locking foot

63‧‧‧ guiding slot

65‧‧‧ fixing screws

65a‧‧‧ Male screw department

67‧‧‧Sliding parts

67a‧‧‧Card ridges

67b‧‧‧Cards with claws

67c‧‧‧ card stop

70‧‧‧Stop base

70a‧‧‧Door-type door support

71a, 71b, 71c‧‧‧ Pressing protrusions

72‧‧‧Flexible support

73‧‧‧Clock support

74‧‧‧ Guidance support

75‧‧‧ fixed table

75a‧‧‧ screw holes

75b‧‧‧Fixed table (clicking ribs)

76‧‧‧Card ridges

77‧‧‧Compressed coil spring

78‧‧‧ Pressing members

78a‧‧‧Arc face

80a, 80b, 80c‧‧‧ wires

90‧‧‧Back cover

91a, 91b, 91c‧‧‧ notch slot

92‧‧‧Clamping claws

93‧‧‧Bundle with protrusions

100‧‧‧Elastic retaining members

101‧‧‧Rotary axis

101a‧‧‧ bearing recess

102‧‧‧1st spring member

103, 105‧‧‧ sliding axis

103a, 105a‧‧‧ sliding protrusion

104‧‧‧2nd spring member

110‧‧‧Bundle belt

Fig. 1 is a perspective view showing a first embodiment of a current sensor according to the present invention.

Fig. 2 is an exploded perspective view of the current sensor shown in Fig. 1.

Fig. 3 is an exploded perspective view of the current sensor shown in Fig. 1 viewed from different angles.

4A and B are perspective views showing the current sensor shown in Fig. 1 before and after assembly.

Fig. 5A is a schematic front view showing a state in which an electric wire is assembled, and B is a partial enlarged view of A.

Fig. 6 is a longitudinal sectional view showing the current sensor shown in Fig. 1 from the back side.

Figure 7 is a diagram for explaining the use of the current sensor of the present invention Description of the figure.

Fig. 8 is a perspective view showing a second embodiment of the current sensor of the present invention.

Fig. 9 is an exploded perspective view of the current detector shown in Fig. 8.

Fig. 10 is an exploded perspective view of the current sensor shown in Fig. 8 viewed from different angles.

11A and B are perspective views showing the front and rear of the current sensor shown in Fig. 8.

Fig. 12 is a perspective view showing a third embodiment of the current sensor of the present invention.

Fig. 13 is an exploded perspective view of the current detector shown in Fig. 12.

Fig. 14 is an exploded perspective view of the current sensor shown in Fig. 12 viewed from different angles.

Fig. 15 is a perspective view showing the front and rear of the current sensor shown in Fig. 12 before and after assembly.

Fig. 16 is a partially enlarged cross-sectional view showing the assembled current sensor shown in Fig. 15B.

Fig. 17 is a perspective view showing a fourth embodiment of the current sensor of the present invention and a schematic front view showing a state of use.

Figure 18 is an exploded perspective view of the current detector shown in Figure 17A.

Figure 19 is an exploded perspective view of the current sensor shown in Figure 17 from a different angle.

20A and B are perspective views showing the front and rear of the current sensor shown in Fig. 17A.

21A and B show a fifth embodiment of the current sensor of the present invention. A perspective view of the form and a perspective view showing the state of use.

Fig. 22 is an exploded perspective view showing the current detector shown in Fig. 21A.

Fig. 23 is an exploded perspective view showing the current sensor shown in Fig. 21A from different angles.

[Formation of the Invention]

Embodiments of the current sensor of the present invention are illustrated in accordance with additional figures of Figures 1 through 23.

As shown in FIGS. 1 to 7, the first embodiment is a case where the current sensor 1 for measuring the current value of three electric wires is used, and is basically constituted by the sensor main body 10 and the stopper base 70.

As shown in FIG. 2, the sensor body 10 is composed of an outer casing 20, an upper cover 30 integrally attached to the upper surface of the outer casing 20, and a front cover 40 covering the front surface of the outer casing 20; The member 50 is slidably attached to the back surface of the front cover 40, and the gate-type printed boards 50 and 51 for measurement are disposed in the casing 20.

As shown in Fig. 2, the outer casing 20 has a box shape having an opening on the front side, and has a connection opening 21 on the upper surface thereof, and is formed at a predetermined pitch by cutting from the lower end surface to the rear surface. U-shaped insertion grooves 22a, 22b, 22c. Further, partition walls 23a, 23b, and 23c having a substantially U-shape are integrally formed along the insertion grooves 22a, 22b, and 22c. In particular, the substantially U-shaped partition wall 23b separating the center insertion grooves 22b is formed by cutting the both end portions thereof from the outer casing 20, and the elastic claw portions 24 are formed at the opposite lower end edge portions of the inner circumferential surface thereof. Moreover, on the slightly U-shaped wall 23b located at the center, it will be used for front and rear support of two pieces of control not shown. The support ridges 25a and 25b for the first and second printed boards are protruded and provided on the side. Further, the outer casing 20 is formed with the engaging holes 26 at a predetermined interval along the opening edge portion thereof.

The upper cover 30 has a planar shape that can cover the upper surface of the outer casing 20, and a liquid crystal display 31 is embedded in a central portion thereof. The liquid crystal display device 31 is connected to the control first and second printed boards (not shown) incorporated in the casing 20, and can be appropriately displayed based on the switching operation of the seesaw type switch 46 to be described later. Current value, voltage value and power value.

As shown in Fig. 2, the front cover 40 has a front surface shape that can cover the front surface of the outer casing 20, and a notch groove 41a having a substantially U-shape at a position corresponding to the insertion grooves 22a, 22b, and 22c of the outer casing 20, 41b, 41c. Further, as shown in Fig. 3, in the three notch grooves 41a, 41b, and 41c, the position defining arm portions 42, 42 are protruded to the side at the opposite side edge portions of the center notch groove 41b. square. Moreover, the guide ridges 43 provided with the guide grooves 43a are respectively extended in the vertical direction at the inner edge portions of the notch grooves 41a and 41c located on both sides. Further, the front cover 40 has an operation display hole 44 at the center of the upper portion of the front surface thereof, and connection holes 45a and 45b are provided on both sides of the operation display window 44, respectively. Further, between the operation display hole 41 and the connection hole 45a, a seesaw type switch 46 and a pair of actuating display holes 47 and 47 disposed above and below are provided. Further, the front cover 40 is provided with an engaging claw portion 48 projecting along the outer peripheral edge portion of the inner facing surface thereof.

As shown in FIG. 2 and FIG. 3, the gate-type printed boards 50 and 51 for measurement are assembled in a slanted state in a state in which the housing 20 is provided. Walls 23a, 23c between the glyphs. A current sensor element such as a GMR element that can measure the current of the electric wire is attached to each of the measurement gate type printed boards 50 and 51, and a magnetic field generated by the electric wire such as a Hall element can also be measured. Tester component. Also, a voltage sensor element that can measure voltage can be mounted as needed.

In the present embodiment, FIGS. 2 and 3 show two gate-type printed boards 50 and 51 for measurement. For the convenience of explanation, between the pair of the measurement gate type printed boards 50 and 51 and the front cover 40, the two pieces of control are not shown via the support ridges 25a and 25b of the outer casing 20. 1. The second printed substrate. In particular, an IC chip is mounted on a first printed circuit board for control (not shown) located on the depth side to constitute a control circuit. Further, in the second printed circuit board for control (not shown) on the front side, a pair of connection sockets are arranged in parallel on both sides of the outward surface, and a pair of switching elements arranged up and down are arranged between the pair of connection sockets. A pair of light-emitting elements configured.

Further, in the first printed circuit board for control, the current value and the voltage value which can be measured based on the current sensor element and the voltage sensor element mounted on the measurement printed boards 50 and 51 can be mounted in advance. And an IC chip that measures the power value by the power factor.

Further, by providing a communication port on any of the first and second control substrates for control, the voltage value of the externally measured wire is received by the communication port, and the wire is measured by the IC chip. Power value.

As shown in Fig. 2, the lock member 60 displays "LOCK" and "FREE" on the upper front side thereof, and the operation rib 61 is protruded from the upper end portion thereof, and the pair is slightly L-shaped on the lower side thereof. locking The feet 62, 62 extend in parallel. Further, as shown in Fig. 3, the lock member 60 is fitted to the pair of guide grooves 63, 63 provided at the side edge portions, respectively, to the guide projections 40a, 40a provided on the back surface of the front cover 40, and It is slidably assembled to the aforementioned front cover 40.

As shown in Fig. 2, the stopper base 70 has a planar shape that can cover the bottom surface of the outer casing 20, and a pressing protrusion that can be fitted into the insertion grooves 22a, 22b, and 22c of the outer casing 20 is protruded from the upper surface. The upper end faces of the pressing protrusions 71a, 71b, and 71c are integrally formed so that the pair of elastic supporting portions 72 and 72 face each other. Further, a corrugated locking support portion 73 is provided at both base portions of the pressing projections 71b located at the center, and the inner side edge portions of the pressing projections 71a and 71c located on both sides are respectively protruded. The guide portion 74 is referenced.

Next, a method of assembling the current sensor 1 of the present embodiment will be described.

First, as shown in FIG. 2, the measurement printed boards 50 and 51 are assembled via the partition walls 23a and 23c in the casing 20, and the first control for the control is positioned via the pair of support ribs 25a and 25b. The second printed substrate. Then, after the liquid crystal display panel 31 of the upper cover 30 is electrically connected to the first and second printed substrates for control via the connection holes 21 of the outer casing 20, the upper cover 30 is integrally bonded to the upper surface of the outer casing 20.

Further, as shown in Fig. 6, the guide grooves 63 and 63 of the lock member 60 are fitted to the center of the back surface of the front cover 40 via the pair of guide projections 40a and 40a, and are slidably attached in the vertical direction. Therefore, the locking legs 62, 62 of the locking member 60 are respectively adjacent to the position defining arms 42, 42 of the front cover 40, and are simultaneously frontward The display window 44 of the cover 40 visually views the characters "LOCK" and "FREE".

Then, the engaging claw portion 48 of the front cover 40 is engaged with the engaging hole 26 of the outer casing 20. Thereby, a connection socket (not shown) attached to the outer surface of the second printed circuit board for control (not shown) protrudes from the connection holes 45a and 45b. Further, a pair of light-emitting elements mounted on the outer surface of the second printed circuit board (not shown) are fitted to the operation display holes 47 and 47 of the front cover 40, respectively. Moreover, the seesaw type switch 46 provided in the front cover 40 can be operated on a switching element (not shown) for controlling the second printed circuit board, and the sensor body 10 is completed.

As shown in FIG. 4A, the electric wires 80a, 80b, and 80c are respectively positioned on the pressing projections 71a, 71b, and 71c of the stopper base 70 that is locked to the base (not shown). In the pressing protrusions 71a, 71b, and 71c of the stopper base 70, the insertion grooves 22a, 22b, and 22c of the sensor body 10 in a state in which the lock member 60 is pulled up are fitted and pushed. Thereby, the elastic claw portions 24 and 24 of the outer casing 20 are elastically deformed, and are respectively engaged with the corrugated locking support portions 73 and 73 of the above-described stopper base 70. Then, the aforementioned sensor body 10 pushes the aforementioned electric wires 80a, 80b, 80c to the pair of elastic supporting portions 72, 72. Further, the locking foot portion 62 is pressed between the elastic claw portion 24 and the position defining arm portion 42 by pushing down the locking member 60, so that the sensor body 10 is locked with respect to the stopping base 70 (fourth Figure B).

In other words, as shown in Figs. 5 and 6, the position of the elastic claw portion 24 can be defined by the locking foot portion 62 of the lock member 60, and the stop base 70 can be surely prevented from coming off the sensor body 10. .

Use of the current sensor 1 of the present embodiment For example, as shown in FIG. 7, the current and voltage can be installed and measured by the electric wire 3 of the manufacturing device 2 in each factory, and the power consumption is constantly measured, and can also be installed on the switchboard 4 The internal measurement measures the total power consumption.

Further, according to the present embodiment, when the electric wires 80a, 80b, and 80c are sandwiched between the sensor main body 10 and the stopper base 70, current or the like can be measured, so that current can be measured at a desired position. Use a convenient current sensor 1 (or / and power sensor).

Further, it is convenient to attach the current sensor to the wired electric wire by attaching the stopper base 70.

As shown in FIGS. 8 to 11, the current sensor of the second embodiment is substantially the same as the first embodiment, and the difference is the connection structure between the sensor body 10 and the stopper base 70.

That is, as shown in Fig. 9 and Fig. 10, unlike the first embodiment, the partition wall 23b of the outer casing 20 is integrally formed without cutting both end portions.

Further, on both side edge portions of the front side of the front cover 40, a through hole 40a through which the fixing screw 65 is inserted is provided, and a locking slit 40b is provided.

Further, the stopper base 70 fixed by the screw 66 (refer to FIG. 10) forms a screw hole 75a in the fixing table 75 projecting from the both end portions of the upper surface thereof, and the fixing bases 75, 75 and the pressing protrusions are simultaneously formed. The engaging ridges 75b and 75b are integrally formed between the respective 71a and 71c.

The other parts are substantially the same as those in the first embodiment, and the same components are denoted by the same reference numerals, and the description thereof will be omitted.

Here, a method of assembling the current sensor 1 of the present embodiment will be described.

As shown in Fig. 11, the electric wires 80a, 80b, and 80c are respectively positioned on the pressing projections 71a, 71b, and 71c of the stopper base 70 that are locked to the base (not shown). Then, the insertion grooves 22a, 22b, and 22c of the sensor body 10 are fitted to and pushed into the pressing protrusions 71a, 71b, and 71c of the stopper base 70. Thereby, the engagement rib 75b of the stopper base 70 is engaged with the engagement slit 40b of the outer casing 20. Then, the fixing screw 65 is inserted into the through hole 40a provided in the front cover 40, and the male screw portion 65a is locked to the screw hole 75a of the stopper base 70, thereby firmly fixing the aforementioned electric wires 80a, 80b. , 80c.

Therefore, according to the present embodiment, it is possible to more accurately position the electric wire with a predetermined position, and it is possible to obtain the advantage of the current sensor 1 having high measurement accuracy.

As shown in Fig. 12 to Fig. 16, the current sensor of the third embodiment is substantially the same as that of the first embodiment, and the pressing structure of the different point stop base 70 for the electric wire and the sensor body 10 are the same. The mounting structure of the base 70 is used.

The sensor body 10 including the outer casing 20 and the front cover 40 is a pair of engaging holes 26 provided between the partition walls 23a, 23b, and 23c of the outer casing 20, and the locking claws 48 of the front cover 40 are stuck. Integration. Further, the sliders 67, 67 are slidably inserted into the lower end portion between the partition walls 23a, 23b, and 23c.

The slider 67 has a frame shape with an insertable front surface at a lower end portion between the partition walls 23a, 23b, and 23c. As shown in Fig. 16, the engaging rib 67a provided on both side surfaces can be The partition walls 23a, 23b, and 23c slide and engage. Also, as shown in Fig. 16B, the aforementioned slip The member 67 is engageable on the side of the engaging claw portions 67b and 67b provided in one of the stopper bases 70, which will be described later, for the engaging door-type support portions 70a and 70a, and is provided at the upper edge portion thereof. The locking projection 67c.

As shown in Figs. 13 and 14, the stopper base 70 has a planar shape that can cover the bottom surface of the outer casing 20, and presses the insertion grooves 22a, 22b, and 22c that are fitted to the outer casing 20 so as to protrude from the upper surface thereof. The projections 71a, 71b, and 71c are used. A pair of engagement door type support portions 70a and 70a are protruded from the upper surfaces of the pressing protrusions 71a, 71b, and 71c. Further, the pressing member 78 is fitted to the fitting hole 76 provided in the pressing protrusions 71a, 71b, and 71c via the pressing coil spring 77. Further, the pressing member 78 has an arcuate surface 78a along the outer circumferential surface of the electric wire, but is not limited thereto, and may be a substantially V-shaped concave surface.

The other parts are substantially the same as those in the first embodiment, and therefore, the same components are denoted by the same reference numerals, and the description thereof will be omitted.

Here, a method of assembling the current sensor 1 of the present embodiment will be described.

First, as shown in Fig. 15, the attachment coil spring 77 and the pressing member 78 are inserted into the fitting holes 76 of the pressing projections 71a, 71b, and 71c of the stopper base 70 that are locked to the base (not shown). Further, the electric wires 80a, 80b, and 80c are respectively positioned on the circular arc surface 78a of the pressing member 78 (Fig. 15).

Further, the engaging ribs 67a of the engaging slider 67 are slid from the side at the lower end portion between the insertion grooves 22a, 22b, and 22c of the sensor body 10, and the stopper groove 20a provided on the bottom surface of the casing 20 is attached. Card that locks the slider 67 The projections 67c are temporarily held and held (for the sake of convenience of explanation, Fig. 15 shows a state in which the slider 67 is attached to the upper surface of the stopper base 70).

Further, the insertion grooves 22a, 22b, and 22c of the sensor body 10 are fitted to and pushed into the pressing protrusions 71a, 71b, and 71c of the stopper base 70. Thereby, the electric wires 80a, 80b, 80c and the pressing member 78 push down the coil spring 77, and the bottom surface of the slider 67 abuts against the upper surface of the stopper base 70. Then, the sliders 67 are pushed into the sensor body 10, and the engagement claws 67b and 67b are engaged with the pair of engagement gate-type support portions 70a and 70a of the stopper base 70, and are simultaneously slipped. The locking projection 67c of the member 67 is locked by the stopper groove 20b provided in the bottom surface of the outer casing 20 (Fig. 16B).

According to the present embodiment, the electric wires 80a, 80b, and 80c are pressed by the pressing coil spring 77 via the pressing member 78. Therefore, even if vibration is applied from the outside, the electric wires 80a, 80b, and 80c abut against the bottom surfaces of the insertion grooves 22a, 22b, and 22c, and are often positioned at predetermined positions, so that the current sensor 1 having high measurement accuracy is obtained. advantage.

The same as the first embodiment, the same components are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in Figs. 17 to 20, the current sensor of the fourth embodiment is the same as the first embodiment, and is applied to the current sensor 1 for measuring the current value of three electric wires. The sensor body 10 and the elastic holding member 100 incorporated in the sensor body 10 are constructed.

As shown in FIGS. 18 and 19, the sensor body 10 is composed of the following items: a casing 20; an upper cover 30, and the foregoing The cover 20 is integrally bonded to the upper surface of the casing 20; the front cover 40 covers the front surface of the casing 20; the rear cover 90 covers the back surface of the casing 20; and the measuring printed boards 50 and 51 are disposed in the casing 20.

In the present embodiment, the first and second printed circuit boards for control are not shown in the same manner as in the first embodiment. However, in order to clarify the connection method, the pair of connection sockets 54a attached to the second printed circuit board for control, 54b is shown in Fig. 17A.

As shown in Fig. 18, the outer casing 20 has a box shape in which the inner wall 20c is spaced forward and backward and has an opening on the front side and the back side. Further, the outer casing 20 has a connection opening 21 on the upper surface thereof, and a substantially U-shaped insertion groove 22a, 22b, 22c is formed at a predetermined pitch by cutting from the lower end surface to the rear surface. Further, partition walls 23a, 23b, and 23c are integrally formed along the insertion grooves 22a, 22b, and 22c on the front side of the intermediate wall 20c. In particular, bearing recesses 27 are formed in the lower end edge portions of the intermediate walls 23a, 23b, and 23c, respectively, and the bearing projections 27a are protruded from the projecting surfaces thereof. Further, a bearing groove portion 27b extending vertically is provided above the bearing projection 27a. Further, above the partition wall 23b located at the center, the support ridges 25a and 25b for supporting the first and second printed boards for control, which are not shown, are protruded and provided on the side. Further, the outer casing 20 is formed with the engaging holes 26 at a predetermined interval along the opening edge portion thereof.

The upper cover 30 has a planar shape that can cover the upper surface of the outer casing 20, and a liquid crystal display 31 is embedded in a central portion thereof. The liquid crystal display 31 is connected to the control first and second printed boards (not shown) incorporated in the casing 20, and can be provided based on the front surface to be described later. The switching operation of the seesaw type switch 46 of the cover 40 appropriately displays the measured current value, voltage value, and power value.

As shown in Fig. 18, the front cover 40 has a front surface shape which can cover the front surface of the outer casing 20, and is provided with a substantially U-shaped notch groove at a position corresponding to the insertion grooves 22a, 22b, 22c of the outer casing 20. 41a, 41b, 41c. Further, as shown in Fig. 19, a bearing projection 49a is provided at a lower end edge portion between the three notch grooves 41a, 41b, and 41c, and a bearing groove portion 49b extending upward and downward is provided above the bearing projection 49a.

As shown in Figs. 19 and 20, the above-described measurement gate type printed boards 50 and 51 are incorporated in the back surface of the intermediate wall 20c of the casing 20. As in the first embodiment, a current sensor element capable of measuring the current of the electric wire, for example, a GMR element, and a voltage capable of measuring a voltage can be attached to each of the measurement gate type printed boards 50 and 51. Sensor component.

In the present embodiment, the two types of the gate-type printed boards 50 and 51 for measurement are not shown in Figs. 18 and 19 . However, the two first and second printed boards for control which are disposed on the front side of the intermediate wall 20c via the support ribs 25a and 25b are not shown. The IC chip is mounted on the first printed circuit board for control (not shown) located on the depth side to constitute a control circuit. Further, in the second printed circuit board for control (not shown) on the front side, a pair of connection sockets 54a and 54b are arranged in parallel on both sides of the outward surface, and a pair of the connection sockets 54a and 54b are disposed between the pair of connection sockets 54a and 54b. A pair of switching elements and a pair of light emitting elements arranged one above the other.

In addition, the first printed substrate for control may not be illustrated. An IC chip in which a power value is calculated using a current value, a voltage value, and a power factor measured by current sensor elements and voltage sensor elements mounted on the measurement printed substrates 50, 51 is mounted.

Further, by providing a communication port on either of the control first and second printed boards, the communication port is used to receive the voltage value of the externally measured wire, and the wire is measured by the IC chip. Power value.

As shown in Figs. 18 and 19, the rear cover 90 has a back surface shape which can cover the rear surface of the outer casing 20, and is provided with a slightly U at a position corresponding to the insertion grooves 22a, 22b, and 22c of the outer casing 20. Notched grooves 91a, 91b, 91c. Further, the rear cover 90 is provided with an engaging claw portion 92 along the outer peripheral edge portion thereof.

With respect to the elastic holding member 100, a pair of slightly J-shaped first spring members 102, 102 extend in parallel from both end edge portions of the rotating shaft 101, and the front end thereof is integrally coupled by the sliding shaft 103. Further, the second spring member 104 having a substantially J-shape extends from the center of the rotating shaft 101, and the sliding shaft 105 is integrally formed with the tip end thereof. Further, the first spring member 102 has a curvature smaller than that of the second spring member 104, and can correspond to an electric wire having a different thickness. In particular, bearing recesses 101a are provided on both end faces of the rotating shaft 101, and sliding projections 103a and 105a are provided on both end faces of the sliding shafts 103 and 105.

Further, a method of assembling the current sensor 1 of the present embodiment will be described.

First, as shown in Fig. 19, the measurement printed boards 50 and 51 are assembled to the back side of the intermediate wall 20c of the casing 20. Further, the first and second printed substrates for control (not shown) are positioned via the pair of support ribs 25a and 25b. . Further, after the first and second printed substrates for control are electrically connected to the liquid crystal display panel 31 of the upper cover 30 via the connection hole 21, the upper cover 30 is integrally bonded to the upper surface of the outer casing 20. Next, the engaging claw portion 92 of the rear cover 90 is engaged with the engaging hole 26 of the outer casing 20, and the opening on the back side is sealed.

Moreover, the rotation shaft 101 is fitted to the bearing recess 27 provided in the inner circumferential surface of the insertion grooves 22a, 22b, and 22c of the outer casing 20, and the bearing recess 101a of the rotary shaft 101 is fitted to the bearing projection 27a to be rotatable. Support. Further, the sliding projections 103a and 105a of the slide shafts 103 and 105 are fitted to the bearing groove portion 27b provided in the intermediate wall 20c to be slidably supported. Then, the engaging claw portion 48 of the front cover 40 is engaged with the engaging hole 26 of the outer casing 20, and the opening on the front side is sealed. Thereby, the bearing projections 49a of the front cover 40 are engaged with the bearing recesses 101a of the rotating shaft 101, and the sliding projections 103a, 105a of the sliding shafts 103, 105 are engaged with the bearing grooves of the front cover 40. The portion 49b completes the assembly of the current sensor 1.

As shown in FIG. 20A, as the method of using the current sensor 1 of the present embodiment, the current sensor 1 is positioned above the wires 80a, 80b, and 80c arranged in parallel, and the wires 80a, 80b, and 80c are placed. The insertion grooves 22a, 22b, 22c of the aforementioned current sensor 1 are inserted and pushed in. Thereby, the first spring portions 102 and 102 of the elastic holding member 100 are elastically deformed, and as shown in FIG. 20B, the electric wires 80a, 80b, and 80c are held.

Further, the second spring portion 104 is elastically deformed and held by the electric wires thicker than the electric wires 80a, 80b, and 80c.

According to this embodiment, the current sensor 1 can be detachably held by the electric wires 80a, 80b, and 80c in a single step, so that the advantages of current and/or electric power at any position can be easily measured.

The other portions are substantially the same as those in the first embodiment. Therefore, the same portions and the same components are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in Figs. 21 and 23, the current sensor of the fifth embodiment is substantially the same as the fourth embodiment, and the difference is the point at which the wire is held by the cable tie 110.

That is, as shown in Fig. 22, the front cover 40 has a front surface shape which can cover the front surface of the outer casing 20, and is provided with a substantially U-shaped notch at a position corresponding to the insertion grooves 22a, 22b, 22c of the outer casing 20. Grooves 41a, 41b, 41c. Further, a pair of binding projections 49 are provided on the side edges of the notch grooves 41a, 41b, and 41c.

Further, as shown in Fig. 23, the rear cover 90 has a back surface shape which can cover the rear surface of the outer casing 20, and is provided with a substantially U-shaped notch at a position corresponding to the insertion grooves 22a, 22b, 22c of the outer casing 20. Grooves 91a, 91b, 91c. Further, a pair of binding projections 93 are provided on the side edges of the notch grooves 41a, 41b, and 41c.

In the same manner as in the first embodiment, the same reference numerals will be given to the same parts and the same parts, and description thereof will be omitted.

Further, as shown in Fig. 21A, the insertion grooves 22a, 22b, and 22c of the current sensor 1 are inserted into the wires 80a, 80b, and 80c and positioned, and then the projections for the bundle of the front cover 40 are attached. 49 and the bundled projections 93 of the rear cover 90 are bundled by the tie-wrap 110 to hold the wires 80a, 80b, and 80c.

According to this embodiment, not only the number of parts is small but also the structure is simple, and the commercially available cable tie 110 can be used to obtain the advantage of the current sensor 1 which is inexpensive to manufacture.

[Industrial availability]

The current sensor of the present invention is not limited to the aforementioned three-phase 3-wire current sensor, and can also be applied to a three-phase 4-wire current sensor, or can also be applied to a voltage sensor and a power sensor.

Further, it is not necessary to provide two insertion slots for measuring the current and voltage of the electric wires, and one or more of them may be provided.

Further, at least one of the opposing inner side surfaces of the insertion grooves 22a, 22b, and 22c provided in the sensor body 10 may be integrally formed with a stopper projection for the stopper wire.

1‧‧‧ Current Sensor

10‧‧‧Sensor body

20‧‧‧ Shell

22a, 22b, 22c‧‧‧ insertion slot

24‧‧‧Flexible claws

30‧‧‧Top cover

40‧‧‧ front cover

41a, 41b, 41c‧‧‧ notch groove

44‧‧‧Operation display hole

45a, 45b‧‧‧ connection holes

46‧‧‧Steering plate switch

47‧‧‧Activity display hole

60‧‧‧Locking members

61‧‧‧operation ribs

70‧‧‧Stop base

71a, 71b, 71c‧‧‧ Pressing protrusions

72‧‧‧Flexible support

73‧‧‧Clock support

74‧‧‧ Guidance support

80a, 80b, 80c‧‧‧ wires

Claims (19)

A current sensor for externally measuring a current flowing through a covered wire, comprising: a sensor body, a built-in current sensor element and juxtaposed with a notch shape that can be inserted into at least two of the aforementioned wires, respectively Inserting a groove; and holding means for holding the wire inserted in the insertion groove on the bottom surface of the insertion groove. The current sensor of claim 1, wherein the width of the insertion groove is narrowed from the notch-like opening toward the bottom surface. The current sensor of claim 1, wherein the bottom surface of the aforementioned insertion groove is at the same depth. The current sensor of claim 1, wherein the bottom surface of the insertion groove has a circular arc shape. The current sensor of claim 1, wherein the bottom surface of the insertion groove is slightly V-shaped. The current sensor according to claim 1, wherein the holding means stop projection is integrally formed with the sensor body so as to protrude from at least one of the opposing inner side faces of the insertion groove. A current sensor according to claim 1, wherein said holding means comprises other members different from said sensor body. The current sensor according to claim 7, wherein the holding means includes at least one bundled projection protruding from the edge portion of the insertion groove toward the side, and a tie-wrap that can be bundled with the bundle for the bundle. The current sensor of claim 7, wherein the holding means is an elastic holding member, is mounted to the sensor body, and can be inserted into and out of the foregoing The slot is ejected in the slot while the previously inserted wire is detachably held. The current sensor of claim 9, wherein the elastic retaining member is formed by a plurality of elastic J-shaped elastic wrists arranged side by side. The current sensor of claim 7, wherein the holding means moves the base, and the pressing protrusions that can be inserted into the insertion grooves of each of the sensor bodies are arranged in parallel and can be fixed to the sensor body. The current sensor according to claim 11, wherein the stopper base is provided with a pair of elastic support portions pressable to the electric wires on an upper end surface of the pressing protrusion. The current sensor according to claim 11, wherein the stopper base has a pressing member that is vertically movably accommodated in an upper end portion of the pressing protrusion and that is pressed upward by a spring member. The current sensor of claim 11, wherein the stop base is configured such that an upper end surface of the pressing member has a circular arc shape. The current sensor of claim 11, wherein the stop base is configured such that an upper end surface of the pressing member has a substantially V shape. The current sensor of claim 1, wherein the display portion is disposed on the sensor body. A power sensor, characterized in that: in a sensor body of a current sensor according to any one of claims 1 to 16, a voltage sensor capable of measuring a voltage of the wire is disposed at the same time And a control circuit that calculates the power value by using the current value measured by the current sensor and the voltage value measured by the voltage sensor. A power sensor, characterized in that in the sensor body of the current sensor according to any one of claims 1 to 16, the aforementioned sensor element A communication port is provided, and a control circuit is provided. The control circuit calculates the power value by using the voltage value of the wire received via the communication port and the current value of the wire measured by the current sensor. A power sensor, characterized in that: in the sensor body of the current sensor according to any one of claims 1 to 16, a storage element for storing a voltage value of the wire is provided, and a control circuit is provided The control circuit calculates the power value using the current value of the aforementioned wire measured by the current sensor and the voltage value stored by the storage element.