JPS628499Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention A-1. Field of Industrial Use The present invention relates to a gas meter verification device that measures the instrumental error of a manufactured or repaired gas meter.

A-2 Prior Art Conventionally, in this type of device, a detection mark was placed on the character wheel built into the gas meter, and a detector was attached to the counter cover to detect the amount of rotation of the detection mark, and the detection was detected by the detector. There was one that measured the instrumental error of the gas meter to be verified by detecting the difference between the displayed amount of the gas meter to be verified and a reference flow meter.

A-3 Problems to be Solved by the Present Invention Conventionally, in this type of device, as a means of attaching the detector to the counter cover of the gas meter, a magnet was attached to the detector side, and the detector was attached to the counter cover using its suction force. There are some types that are attached to the counter cover, and others that have a pair of clamping rollers attached to the detector via a leaf spring, and the detector is clampedly attached to the counter cover by the rollers. However, it is impossible to install a non-ferrous metal gas meter, and the latter has a complicated structure, is large and heavy, and has poor operability. It is difficult to easily set the sensor at a suitable position, and as a result, detection may not be possible.

B. Structure of the invention B-1 Means for solving the problems The purpose of the present invention is to propose a gas meter verification device that eliminates the above-mentioned drawbacks.

That is, in order to solve the above-mentioned problems, a box-shaped cover 5 made of synthetic resin and having an open rear surface is provided, and the inner width of the circumferential wall of the cover 5 is adjusted so that the inner width of the circumferential wall is the same as that of the gas meter to be fitted. In addition, notches 8 and 9 are formed at both corners of at least one side of the peripheral wall to give the sides elasticity in the outward and outward directions. 5 is provided with light emitting/receiving elements 6 and 7 which are provided in the counter cover 2 and are visible from the outside and detect the amount of rotation of the character wheel 3, which is provided with a reflective index 3a on the character wheel 3. It is characterized by this.

RO-2 Embodiment Next, an embodiment of the present invention shown in the drawings will be described.

1 is a gas meter main body, and a counter cover 2 is provided integrally with the main body on the upper front surface thereof.

The upper and lower, left and right outer surfaces of the counter cover 2 are formed into tapered surfaces that widen from the front toward the rear. Further, as shown in FIG. 4, a character wheel 3 is built into the counter cover 2 so that it can be seen from the front outside, and a suitable length is provided on the surface of the character wheel 3 in a direction orthogonal to its rotation. A reflective indicator 3a is provided which has a width and has a much higher reflectance than other parts. A detector 4 includes a cover 5, a light emitting element 6, and a light receiving element 7. Cover 5 is
It is formed of a thermoplastic synthetic resin material into a box shape with an open rear surface, and its upper and lower walls 5a,
5b is formed by setting its inner width so that these fit tightly to the upper and lower outer surfaces of the counter cover 2, and the left and right walls 5c and 5d are formed so that they fit closely to the left and right outer surfaces of the counter cover 2. It is formed by setting the inner width as follows. Further, notches 8 and 9 with open rear surfaces are formed at both left and right corners of the lower end of the cover 5, so that the lower wall 5b has elasticity in the vertical direction. Reinforcing ribs 10 are formed on the inner surfaces of the upper and lower walls 5a and 5b, and stoppers 11 are formed on the inner surfaces of the left and right walls 5c and 5d, respectively, in the front-rear direction. The light emitting element 6 and the light receiving element 7 are housed in the cover 5 by a holder 12, and their mounting position and inclination are adjusted so that the emitted light beam is reflected on the reflective index 3a of the character wheel 3 and enters the light receiving element 7. Angle is set. Further, the light emitting/receiving elements 6 and 7 are arranged in the direction of rotation of the character wheel 3, so that even if the position of the detector 4 is shifted, it can be detected. Reference numeral 13 denotes a brightness adjuster, which adjusts this to make the detector 4 of uniform performance when detection becomes impossible due to variations in the performance of the light emitting/receiving elements 6 and 7. The light emitting/receiving elements 6, 7 and the brightness adjuster 13 are wired as shown in FIG. 5, and are connected to a pulse counter (not shown) through a cord 14.

As described above, when testing a gas meter, the cover 5 is press-fitted into the counter cover 2 of the gas meter from the front side.

Thereby, the cover 5 is elastically held on the counter cover 2 by the vertical elastic force of the lower wall 5b. By fitting in this way, the light emitting/receiving elements 6 and 7 naturally align with the reflective index 3.
It is set at the verification position for the character wheel 3 with a.

Then, at the same time as gas is flowing through the gas meter 1, the verification device is activated, and the light emitting/receiving elements 6, 7 are
As a result, the rotational speed of the character wheel 3 provided with a reflective index 3a on the surface of the character wheel is detected, and compared with a reference flowmeter as is well known, to verify the instrumental error. Reflection index 3
When a is provided at 10 locations equally dividing the entire circumference of the character wheel 3, the amount of rotation can also be detected in units of 1/10 times.

C. Effect of the invention As described above, in the present invention, the light emitting and receiving elements 6 and 7 are built into the cover 5 so that the cover 5 can be fitted to the counter cover 2 in a cover-like manner. It can block light and prevent detector malfunction. In addition, the counter cover 2 of the detector
Since the attachment to the cover 5 is simply done by fitting the cover 5 into the surrounding wall and using the elastic force of the surrounding wall, the structure is extremely simple and can be manufactured at low cost compared to conventional systems that use a complicated mechanism. The gas meter main body 1 can be made lightweight, and the detector can be installed even if the gas meter main body 1 is made of a non-magnetic material. Furthermore, by using the peripheral wall of the cover 5 as the mounting means, the detector 4 can always be set at a constant position, and the mounting position will not shift and become impossible to detect. In addition, since the notches 8 and 9 are provided at both left and right corners of the lower end of the cover 5, the elasticity of the cover 5 is increased, and even if the verification device is attached to the gas meter 1 after painting, the paint film will not be scratched. It is extremely effective as a gas meter verification device.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figure 1 is a side view of the gas meter body and detector, Figure 2 is a perspective view of the detector as seen from the rear, Figure 3 is a rear view of the detector, and Figure 3 is a rear view of the detector. Figure 4 is a sectional view taken along line A-A' in Figure 3;
FIG. 5 is a wiring diagram. 1...Gas meter body, 2...Counter cover, 3...Character wheel, 3a...Reflection indicator, 4...Detector, 5...Cover, 5a to 5d...Upper and lower, left and right walls that are peripheral walls, 6. 7... Light emitting/receiving element, 8, 9...
...Notch.

Claims (1)

[Scope of utility model registration request] A detector 4 which is used by fitting the counter cover in a covering manner in a gas meter in which a character wheel inside a counter cover is visible from the outside and a reflective index is provided on the character wheel.
a box-shaped cover 5 made of synthetic resin having a fitting opening on the rear surface and having elasticity on at least one side, and a projection built in the cover 5 that detects the number of rotations of the character wheel using a reflective index of the character wheel. 1. A gas meter verification device comprising a light receiving element.