JP4657085B2 - Measuring instrument seal structure - Google Patents

Description

  The present invention relates to, for example, a watt-hour meter that measures the amount of power in an electric circuit, and more particularly to a sealing structure that seals in a state in which a measuring instrument that measures the amount of power is housed.

Sealing of watt-hour meters in Japan is enforced in accordance with the Measurement Law, and it is necessary to apply a certification seal at the Japan Electric Meters Inspection Center.
In order to make the accuracy of each watt hour meter the same so that there is no difference in the amount of power metered by each consumer, the verification seal adjusts the measuring instrument inside the watt hour meter, and then from the outside This is done so that it is not forcibly altered.

  As one of the means for performing the verification seal, a method is used in which a dedicated sealing cap is mounted on the head of a dedicated sealing screw for fixing the case for storing the measuring instrument. Once this sealing cap is mounted, the sealing cap is used. Since it has a structure that cannot be removed unless it is destroyed, it has a function of preventing a measuring instrument inside the case from being altered by mounting a sealing cap. (For example, see Patent Document 1 and FIG. 1)

JP 2004-245704 A

  The sealing structure of a conventional measuring instrument is configured as described above, and is a structure in which sealing is performed using a dedicated sealing screw corresponding to the sealing cap, and there is a problem that the number of parts is large and assembly time is long. .

  This invention was made in order to solve the above-mentioned subject, and it aims at obtaining the sealing structure sealed in the state which accommodated the measuring instrument, without using an exclusive sealing screw. is there.

The sealing structure of the measuring instrument according to the present invention includes a measuring unit that measures the amount of electricity, a housing that joins the first case and the second case and stores the measuring unit therein, and the first In a sealing structure of a measuring instrument having a sealing means that cannot be opened in a state in which the case and the second case are joined, the sealing means forms a notch in the first case, and this notch And a sealing projection having a ring-like fitting groove formed on the outer peripheral surface, and a wall surface at a location corresponding to the cut portion of the second case , the sealing projection penetrating therethrough a projection through-hole that is, projection the sealing protrusion into the protrusion through hole and a sealing cap which covered state of the sealing projection in a state of being through the sealing cap that is fitted said sealing projection The insertion hole and the sealing protrusion There is obtained a fitting convex portion to be fitted into the fitting groove when fitted to the protrusion insertion hole.

  Since the sealing structure of the measuring instrument of this invention is configured as described above, when performing sealing with a sealing cap, it is possible to perform sealing without using a dedicated sealing screw, This has the effect of reducing the number of parts and shortening the assembly time.

Embodiment 1 FIG.
1 is an external perspective view showing a sealing structure of a measuring instrument according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of the measuring instrument of FIG. 1, and FIG. 3 is a main part before attaching the sealing cap of FIG. It is an enlarged view.
In the figure, a measuring instrument 100 includes a measuring unit 1 that measures the amount of electric power based on an electric signal input from a terminal (not shown), a first case 2 and a second case 3. Are connected to each other, and a sealing means 5 is formed so that the first case 2 and the second case 3 cannot be opened in a state where the first case 2 and the second case 3 are joined.

The sealing means 5 includes a sealing projection 2a disposed in the first case 2, a projection through-hole 3a disposed in the second case 3 and through which the sealing projection 2a passes, and the projection through-hole 3a. The sealing cap 6 is configured to cover the sealing projection 2a in a state where the sealing projection 2a is penetrated.
The sealing projection 2a includes a fitting groove 2c formed in a ring shape on the outer peripheral surface. The sealing cap 6 has a projection insertion hole 6a into which the sealing projection 2a is inserted, and the sealing projection 2a has a projection insertion hole 6a. And a fitting projection 6b that fits into the fitting groove 2c when fitted into the fitting groove 2c.
The first case 2 is provided with a case fixing claw 2b, and the second case 3 is provided with a claw locking hole 3b for locking the fixed claw 2b and a display window for displaying the electric energy measured by the measuring unit 1. 3c is arranged.

The measuring instrument 100 according to the first embodiment of the present invention configured as described above is configured such that the sealing protrusion 2a is inserted into the protrusion through hole 3a and the first case 2 and the second case 3 are joined. The case fixing claw 2b is locked in the claw locking hole 3b disposed in the second case 3, and the first case 2 and the second case 3 are integrated to form the housing 4. The
Next, when the projection insertion hole 6a of the sealing cap 6 is fitted into the sealing projection 2a, the fitting convex portion 6b is fitted into the fitting groove 2c formed in a ring shape on the outer peripheral surface of the sealing projection 2a. The sealing cap 6 is fixed to the sealing projection 2 a, and the measuring unit 1 is sealed in an unopenable state by the sealing cap 6 while being stored in the housing 4.

The measuring instrument in the first embodiment configured as described above is capable of sealing without using a dedicated sealing screw in the configuration in which the sealing of the measuring instrument 100 is performed by the sealing cap 6. The number of points can be reduced and the assembly time can be shortened.
Further, the fitting cap 6b is fitted into the fitting groove 2c formed in a ring shape on the outer peripheral surface of the sealing projection 2a, so that the sealing cap 6 is fixed to the sealing projection 2a. Since it cannot be removed unless it is destroyed, the measuring unit 1 inside the housing 4 is not altered.

Embodiment 2. FIG.
4 is an external perspective view showing a sealing structure of a measuring instrument according to Embodiment 2 of the present invention, FIG. 5 is an exploded perspective view of the measuring instrument of FIG. 4, and FIG. 6 is an enlarged view of a main part before attaching the sealing cap of FIG. 7 is an enlarged view of the main part of FIG. 5. In FIG. 7, the measuring instrument 101 measures the amount of electricity based on an electric signal input from a terminal (not shown). 1, the first case 7 and the second case 8 are joined to each other, and the housing 4 that houses the measuring unit 1 therein, and the first case 7 and the second case 8 are joined together. It is comprised with the sealing means 5 made impossible to form.
The sealing means 5 includes a sealed first protrusion 7a disposed on the first case 7, a sealed second protrusion 8a disposed on the second case 8 and in contact with the sealed first protrusion 7a, and a sealed first protrusion. 7a and the sealing second projection 8a, the sealing first projection 7a and the sealing cap 6 that covers the sealing second projection 8a.

A first fitting groove 7c is formed on the outer peripheral surface of the sealing first protrusion 7a, a second fitting groove 8d is formed on the outer peripheral surface of the sealing second protrusion 8a, and the sealing cap 6 is sealed first protrusion. 7a and the sealing second projection 8a are inserted in a state where they are in contact with each other, and when the sealing first projection 7a and the sealing second projection 8a are in contact with each other, the first is inserted. The fitting groove 7c and the fitting convex part 6b fitted to the second fitting groove 8d are provided.
A case fixing claw 7b (shown in FIG. 7) is disposed in the first case 7, and a claw locking hole 8b (shown in FIG. 7) in which the fixed claw 7b is locked in the second case 8 and measurement. A display window 8c (shown in FIG. 5) for displaying the amount of power measured by the unit 1 is provided.

In the measuring instrument 101 according to the second embodiment of the present invention configured as described above, the case fixing claw 7b is disposed in the second case 8 when the sealing first protrusion 7a and the sealing second protrusion 8a are brought into contact with each other. The case 4 is formed by the first case 7 and the second case 8 being integrated with each other by being locked in the claw locking hole 8b.
Next, when the protrusion insertion hole 6a of the seal cap 6 is fitted into the seal first protrusion 7a and the seal second protrusion 8a while the seal first protrusion 7a and the seal second protrusion 8a are in contact with each other, a ring shape is obtained. The fitting convex portion 6b is fitted into the first fitting groove 7c and the second fitting groove 8d formed in the above, and the sealing cap 6 is integrally fixed to the sealing first protrusion 7a and the sealing second protrusion 8a. Then, the measuring unit 1 is sealed in an unopenable state by the sealing cap 6 while being stored in the housing 4.

The measuring instrument in the second embodiment configured as described above is capable of sealing without using a dedicated sealing screw in the configuration in which the measuring instrument 101 is sealed with the sealing cap 6. The number of points can be reduced and the assembly time can be shortened.
Further, when the fitting convex portion 6b is fitted into the first fitting groove 7c and the second fitting groove 8d formed in a ring shape, the sealing cap 6 has the sealing first protrusion 7a and the sealing second protrusion. Since it is integrally fixed to 8a, it cannot be removed unless the sealing cap 6 is destroyed, so that the measuring unit 1 inside the housing 4 is not altered.

It is an external appearance perspective view which shows the sealing structure of the measuring device in Embodiment 1 of this invention. It is a disassembled perspective view of the measuring device of FIG. It is a principal part enlarged view before sealing cap installation of FIG. It is an external appearance perspective view which shows the sealing structure of the measuring device in Embodiment 2 of this invention. It is a disassembled perspective view of the measuring device of FIG. It is a principal part enlarged view before sealing cap installation of FIG. It is a principal part enlarged view of FIG.

Explanation of symbols

1 measurement part, 2,7 1st case, 2a sealing protrusion, 2c fitting groove,
2nd case, 3a protrusion through-hole, 4 housing, 5 sealing means, 6 sealing cap,
6a protrusion insertion hole, 6b fitting protrusion, 7a sealing first protrusion, 7c first fitting groove,
8a Sealed second protrusion, 8d Second fitting groove, 100, 101 Measuring instrument.

Claims (2)

A measurement unit that measures the amount of electricity;
A housing that joins the first case and the second case to house the measurement unit;
In the sealing structure of the measuring instrument having sealing means for forming the first case and the second case in an unopenable state in a joined state,
The sealing means is
Forming a notch in the first case, provided protruding from the notch, and a sealing protrusion having a ring-shaped fitting groove formed on the outer peripheral surface ;
A protrusion through-hole formed in a wall surface of the portion corresponding to the cut portion of the second case , and through which the sealing protrusion is passed;
A sealing cap for mounting the sealing protrusion in a state where the sealing protrusion is passed through the protrusion through hole ;
The sealing cap and protrusion insertion hole in which the sealing projection is fitted,
Seal construction of measuring instruments characterized in that a fitting convex portion to be fitted into the fitting groove when the sealing projection is inserted into the protrusion insertion hole. A measurement unit that measures the amount of electricity;
A housing that joins the first case and the second case to house the measurement unit;
In the sealing structure of the measuring instrument having sealing means for forming the first case and the second case so as not to be opened in the joined state,
The sealing means is
Forming a cut portion in the first case, protruding from the cut portion, and provided with a semicircular cross-section sealed first protrusion having a circumferential surface and a flat portion formed with a fitting groove ;
A flat surface portion formed on a wall surface of the second case corresponding to the cut portion and contacting the flat surface portion of the sealing first projection, and fitting of the sealing first protrusion when contacting the sealing first projection A sealing second protrusion having a semicircular cross section having a circumferential surface formed with a fitting groove that forms a ring-shaped groove connected to the groove ;
And a sealing cap which covered state and said sealing second protrusion and said sealing the first protrusion and the planar portion of the sealing second protrusion with the plane of the sealing first projection while abutting,
The sealing cap includes a protrusion insertion hole that is inserted into a cylindrical portion formed by contact between the sealing first protrusion and the sealing second protrusion, a fitting groove of the sealing first protrusion , and the sealing second. seal construction of measuring instruments you characterized in that a fitting convex portion to be fitted into the ring-shaped groove formed in the fitting groove of the protrusion.

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