JP3278569B2 - Current meter of integrated watt-hour meter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a current measuring unit incorporated in an integrated watt-hour meter.

[0002]

2. Description of the Related Art FIG. 11A is a side view showing a state before assembling a conventional current measuring unit incorporated in an electronic integrated watt-hour meter using a Hall element, and FIG. 12 (a) is a plan view of FIG. 11 (a), and FIG.
12 (b) is a plan view of FIG. 11 (b).

FIGS. 11 (a) and 11 (b) and FIGS.
In (b), a central portion of a connection line 2a of a current line 2 formed into a U-shape by casting is loosely fitted inside an iron core 7 formed from a ferrite material into a substantially C shape by casting.

At the left end of the connection line 2a in FIGS. 11 and 12, a terminal portion 2 having a larger thickness and width than the connection line 2a is provided.
The terminal 2b is formed with a pair of female screw holes 2c for connection.

On the other hand, a gap 7a formed on the right side of the iron core 7
Is inserted in the center of the left end of the printed circuit board 3A, and a magneto-electric conversion element (Hall element) 4 is soldered on the upper surface of the printed circuit board 3A in advance.

[0006] In the current measuring section configured as described above, the magnetic flux generated by the current flowing through the current line 2 and passing through the iron core 7 is converted into an electric signal by the magneto-electric conversion element 4.
Output to the input circuit of the printed circuit board 3A.

On the printed circuit board 3A, the signal of the voltage line separately detected by the voltage division by the resistor and the signal input from the magnetoelectric conversion element 4 are sent to the integrator via the multiplier, and the integrated power is displayed on the display of the watt hour meter. Is displayed. Therefore printed circuit board 3A
Incorporates a multiplication circuit and an integration circuit.

[0008]

However, in the current measuring section of the integrated watt-hour meter constructed as described above, the length of the gap 7a of the iron core 7 is shorter than the thickness of the connection line 2a. In the case where is incorporated in the iron core 7, it must be rotated 90 ° after being inserted from the terminal portion 2b on one side.

[0009] Therefore, although it is a mass-produced product, it is difficult to automate it, which is an obstacle to increasing the production. Therefore, an object of the present invention is to provide a current measuring unit of an integrated watt-hour meter that can increase the efficiency of an assembling operation.

[0010]

According to a first aspect of the present invention, there is provided a current measuring unit for an integrated watt hour meter, comprising: a current line penetrating through a U-shaped iron core; and one end inside an open end of the iron core. The magnetoelectric conversion element inserted and opposed to the inner surface of the open end of the iron core has one surface.
A substrate which is fixed to a solid of the magnetoelectric converting element of the substrate
Of the iron core piece formed in the fixed portion and fixed to the other side of the substrate.
One side characterized by comprising the insertion holes to be inserted.

According to a second aspect of the present invention, the current meter of the integrated watt-hour meter is a current meter of the first embodiment.
On one side of the printed circuit board, facing the open end of the iron core
The recess is formed .

According to the present invention, by such means, the current wire can be inserted into the iron core in a linear operation.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the current meter of the integrated watt-hour meter according to the present invention will be described below with reference to the drawings. FIG.
FIG. 11A is an exploded side view showing an embodiment of a current measuring unit of the integrated watt-hour meter of the present invention, and FIG.
FIG. 1B is a view corresponding to FIG. 1A, and FIG. 1B is a side view showing a state after assembly, and is a view corresponding to FIG. Similarly, FIGS. 2 (a) is a plan view of FIG. 1 (a), FIG., And FIG. 2 (b) corresponding to FIG. 12 (a) is likewise assembled plan view corresponding in Figure 12 (b).

FIGS. 1 (a) and 1 (b) and FIGS.
In FIG. 11B, FIG. 11A and FIG.
12 (b) and FIGS. 12 (a) and 12 (b) are the assembling structure of the iron core and the portion of the printed circuit board to be inserted into the iron core. Therefore, the same elements as those shown in FIG. 11 and FIG.
The same reference numerals are given and the description is omitted.

That is, the iron core 1A has a U-shape while the iron core 7 shown in FIGS. 11 and 12 has a C-shape. On the other hand, on the upper surface in FIG. 1 of the magnetoelectric conversion element 4 brazed to the center of the left end of the printed circuit board 3A, an iron core piece 5A that is substantially square and slightly thinner in a plan view made of a ferrite material is used as an adhesive. It is fixed at.

Further, an upper core piece 5A having the same shape as the upper core piece 5A in plan view and having a slightly larger thickness is joined to the lower surface of the magnetoelectric conversion element 4 in FIG. At the stage of assembling the printed circuit board 3A together with 6A, it is inserted from the right side into the opening side of the iron core 1A as shown by the arrow A.

In the current measuring section of the integrated watt-hour meter in which the printed circuit board 3A is assembled as described above, the work of inserting the current wire 2 into the iron core 1A is performed from the direction of the printed circuit board 3A shown in FIGS. It can be assembled by loosely fitting as shown by the arrow A, or by loosely fitting the terminal portion 2b of the current wire 2 upward from the opening 1a side and tilting the terminal 2b forward by 90 ° in a state where the terminal portion 2b of the current wire 2 is vertically oriented upward. Therefore, assembly by automation becomes easy, and it is possible to cope with mass production.

[0018] FIGS. 3 (a) is an exploded side view showing another embodiment of the current measuring section of the watt hour meter of the present invention, FIGS. 11 (a) and the embodiment shown in the prior art 1 (a) and FIG. 3 (b) are side views showing a state after assembling, and also correspond to FIG. 11 (b) also shown in the prior art and FIG. 1 (b) of one embodiment. FIG.

Similarly, FIG. 4 (a) is a plan view of FIG. 3 (a) corresponding to FIGS. 12 (a) and 2 (a), and FIG.
(B) is an assembly plan view corresponding to FIGS. 12 (b) and 2 (b).

FIGS. 3A and 3B and FIGS.
In FIG. 11B, FIG. 11A and FIG.
(B) and FIGS. 12 (a) and 12 (b) and FIGS.
2 (b) and FIGS. 2 (a) and 2 (b) are in the assembling configuration of a portion of the printed circuit board to be inserted into the iron core. Therefore, the same elements as those shown in FIGS. 11 and 12 and FIGS. 1 and 2 are denoted by the same reference numerals and description thereof will be omitted.

That is, in FIG. 3, the upper surface of the magneto-electric conversion element 4 brazed to the center of the left end of the printed circuit board 3A has a substantially square plan view made of ferrite material and has a thickness of FIGS. An iron core piece 5B, which is an added value of the iron core pieces 5A and 5B, is fixed with an adhesive.

In the current measuring section of the integrated watt-hour meter having the printed circuit board 3A assembled as described above, the operation of inserting the current wire 2 into the iron core 1A is the same as the current measuring section shown in FIGS. Or loosely fit as shown by arrow A,
Alternatively, in a state where the terminal portion 2b of the current wire 2 is vertically oriented upward, it can be incorporated by loosely fitting from the opening 1a side and falling 90 ° forward. Therefore, also in the current measuring unit of the integrated watt-hour meter configured as described above, the assembling by automation becomes easy, so that it is possible to cope with mass production.

Next, FIG. 5A is an exploded side view showing still another embodiment of the current measuring section of the integrated watt-hour meter according to the present invention. FIG. 3A and FIG. 5B are side views showing a state after assembly, and are views corresponding to FIGS. 1B and 3B.

FIG. 6A is a plan view corresponding to FIGS. 2A and 4A, and FIG.
(B) is an assembly plan view corresponding to FIG. 2 (b) and FIG. 4 (b).

FIGS. 5A and 5B and FIGS.
3B differs from FIGS. 1, 2, 3 and 4 in the assembly configuration of the part of the printed circuit board to be inserted into the iron core. Therefore, the same elements as those shown in FIGS. 1, 2, 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

That is, the same core piece 5B as the core piece 5B shown in FIGS. 3 and 4 is provided on the lower surface in FIG. 5 of the printed circuit board 3A of the magneto-electric conversion element 4 brazed at the center of the left end.
B is fixed with an adhesive.

In the current measuring section of the integrated watt-hour meter having the printed circuit board 3B assembled as described above, the operation of inserting the current wire 2 into the iron core 1A is shown in FIGS. 1, 2, 3 and 4. Similarly to the current measuring portion, loosely fit as indicated by the arrow A, or loosely fit from the opening 1a side with the terminal portion 2b of the current line 2 turned vertically upward and tilt forward by 90 °. And can be incorporated. Accordingly, the current metering section of the integrated watt-hour meter configured as described above can easily be assembled by automation, and can cope with mass production.

Next, FIG. 7A is an exploded side view showing another embodiment of the current measuring unit of the integrated watt-hour meter of the present invention, and FIG. 1A, FIG. 3A and FIG. FIG. 7B is a side view showing a state after assembly, and FIG.
It is a figure corresponding to (b) and FIG.3 (b), FIG.5 (b).

8 (a) is a plan view of FIG. 7 (a), corresponding to FIGS. 2 (a), 4 (a) and 6 (a), and FIG. FIG. 7 is an assembly plan view corresponding to FIGS. 2 (b), 4 (b), and 6 (b).

FIGS. 7A and 7B and FIGS.
1 (b) is different from FIGS. 1, 2 and 3, 4, 5, and 6 in the structure of fixing an iron core to a printed circuit board. Therefore, FIGS. 1 and 2 and FIGS.
Elements that are the same as the elements shown in FIG. 6 are given the same reference numerals, and descriptions thereof will be omitted.

That is, the lower surface of the printed circuit board 3A of the magneto-electric conversion element 4 brazed at the center of the left end in FIG. 5 has a thickness smaller than that of the core piece 5B shown in FIGS. An iron core piece 6B thicker by the plate thickness is inserted and fixed in a square hole formed in the printed circuit board 3B.

Therefore, the printed circuit board 3A
In the operation of inserting the current wire 2 into the iron core 1A also in the current measuring section of the integrated watt-hour meter in which the power meter is assembled, the current measuring section shown in FIGS. 1, 2 and 3, 4, 5, and 6 is used. In the same manner as described above, the opening portion 1a is loosely fitted as shown by the arrow A, or the terminal portion 2b of the current line 2 is vertically oriented upward.
By loosely fitting from the side and tilting 90 ° forward, not only can it be incorporated, but also the magnetic resistance in the air gap 1a of the iron core 1A can be reduced, so that the detection accuracy can be improved.

Further, since assembly by automation becomes easy, it is possible to cope with mass production. In addition, iron core 6
Since no adhesive is used for the fixing operation of B, the assembling operation is further facilitated.

Next, FIG. 9A is an exploded side view showing another embodiment of the current measuring unit of the integrated watt-hour meter according to the present invention, and FIGS. 1A and 3A and FIG. 5 (a), FIG.
9 (b) is a side view showing a state after assembly, and FIGS. 1 (b), 3 (b) and 5
(B), It is a figure corresponding to FIG.7 (b).

Similarly, FIG. 10A is a plan view of FIG. 9A, and FIG. 2A, FIG. 4A, FIG.
FIG. 10 (b) is a view corresponding to FIG. 2 (a), and FIG. 10 (b) is an assembly plan view corresponding to FIG. 2 (b), FIG. 4 (b), FIG. 6 (b), and FIG.

FIGS. 9A and 9B and FIGS.
1B, FIG. 2, FIG. 4, FIG. 5, FIG. 6, FIG. 7, and FIG. 8 is the shape of the tip of the printed circuit board to the iron core. Therefore, the same components as those shown in FIGS. 1 and 2 and FIGS. 3, 4, 5, 6, 7, and 8 are denoted by the same reference numerals, and description thereof is omitted. That is, a shallow U-shaped concave portion 3a is formed at the center of the front end of the printed circuit board 3C in FIG.

In the current measuring section of the integrated watt-hour meter having the printed circuit board 3C thus formed, the printed circuit board 3C
In the operation of inserting C into the iron core 1A, the printed circuit board 3
Since the position in the front-rear direction of the sheet of FIG. 10C can be easily confirmed, the assembling is facilitated.

[0038]

As described above, according to the present invention,
And current lines inserted through the U-shaped core, a substrate magnetoelectric converting element is fixed to one side of opposing the inner surface of the open end of the iron core on one side are inserted inside the open end of the core, magnetoelectric variations of the substrate
Formed on the fixed part of the exchange element and fixed to the other side of the substrate
The current metering section of the integrated watt-hour meter, which has an insertion hole into which one side of the core piece is inserted so that the current wire can be inserted in a straight line through the iron core, thereby increasing the efficiency of assembly work You can also get the iron core on one side of the printed circuit board
The recess and the iron core are formed by forming a recess opposite the open end of
Since the current wire can be inserted into the iron core in a straight line operation in the state of being opposed, a current measuring section of the integrated watt hour meter that can increase the efficiency of the assembling work can be obtained.

[Brief description of the drawings]

FIG. 1A is an exploded side view showing an embodiment of a current measuring unit of the integrated watt-hour meter of the present invention, and FIG. 1B is an assembled view of FIG.

2 (a) is a plan view of FIG. 1 (a), and FIG.
FIG.

FIG. 3A is an exploded side view showing another embodiment of the current measuring unit of the integrated watt-hour meter of the present invention, and FIG. 3B is an assembled view of FIG.

4A is a plan view of FIG. 3A, and FIG.
FIG.

FIG. 5A is an exploded side view showing still another embodiment of the current measuring unit of the integrated watt hour meter of the present invention, and FIG.
FIG.

6 (a) is a plan view of FIG. 5 (a), and FIG.
FIG.

7A is an exploded side view showing another embodiment of the current measuring unit of the integrated watt-hour meter of the present invention, and FIG. 7B is an assembled view of FIG.

8A is a plan view of FIG. 7, and FIG. 8B is an assembly view of FIG.

FIG. 9A is an exploded side view showing another embodiment of the current measuring unit of the integrated watt hour meter of the present invention, and FIG.
FIG.

10A is a plan view of FIG. 9A, and FIG.
FIG.

11A is an exploded side view showing an example of a current measuring unit of a conventional integrated watt hour meter, and FIG. 11B is an assembled view of FIG.

12A is a plan view of FIG. 11A, and FIG.
FIG.

[Explanation of symbols]

1A: iron core, 1a: air gap, 2: current wire, 2a: connection wire,
2b: terminal portion, 3A: printed circuit board, 3a: concave portion, 4 ...
Magnetoelectric conversion element, 5A, 5B, 6A, 6B, 6C: iron core piece.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G01R 11/02 G01R 15/20 G01B 7/00 G01B 7/30 101 G01D 5/18

Claims (2)

(57) [Claims] 1. A substrate on which a current line penetrating a U-shaped iron core and a magnetoelectric conversion element having one side inserted inside the open end of the iron core and facing the inner surface of the open end of the iron core are fixed on one side. Formed on a fixed portion of the magneto-electric conversion element of the substrate.
One side of the core piece fixed to the other side of the substrate is inserted.
Current meter of an integrated watt-hour meter with an insertion hole . 2. An open end of the iron core is formed on one side of the substrate.
The concave portion for placing is formed.
Current meter of the integrated watt hour meter.