JPS6241213Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a water meter for measuring the amount of water consumed in water supply, and particularly to an airtight protection device for an electronic circuit in this water meter.

[Technical background of the invention]

Once installed in a water pipe, this type of water meter is required to have a service life of 8 years or more, and the electronic circuit built into the water meter that measures the amount of water consumed is Since it is easily corroded by water droplets that condense due to humidity caused by changes in temperature, the container body housing the electronic circuit is hermetically sealed with a mechanical seal, an O-ring, etc., and an epoxy resin.

That is, as shown in FIGS. 1 and 2, a supply port 1b and a discharge port 1c equipped with a strainer 1a.
A middle partition plate 2 is formed in the middle of a case body (meter housing) 1 having a diameter, and a lower bottomed cylindrical body (also referred to as a lower inner case) 3 is sunk into the case body 1 where the middle partition plate 2 is located. This lower bottomed cylinder 3
An inlet 3a and an outlet 3b for fluid (water) are bored in the outer periphery of the lower part of the body, and a rotating shaft 4a of an impeller 4 is vertically rotatably mounted in this lower bottomed cylindrical body 3. A magnet 5 having N and S poles is integrally attached to the upper end of the rotating shaft 4a, and a boss 6a is provided at the upper opening 3c of the lower bottomed cylinder 3 where the magnet 5 is located. An upper bottomed cylindrical body (upper inner case) 6 is stacked, and an electronic circuit 7 for counting the number of rotations of the magnet 5 is quietly installed inside the upper bottomed cylindrical body 6 located directly above the magnet 5. A liquid crystal display board 8 for displaying water consumption is attached to the upper bottomed cylinder 6 above the electronic circuit 7, and the upper bottomed cylinder 6 above the liquid crystal display board 8 is made of a transparent synthetic resin material. A plate 9 is placed with each O-ring 10 interposed therebetween, and the transparent plate 9 is screwed onto the case body 1 with a tightening nut 11, and a part of the transparent plate 9 is connected to the electronic circuit 7. It is constructed by installing a plurality of (three) terminals 12 and connecting each terminal 12 to a cable 14 connected to a storage device of a computer (not shown) through a lead wire inside an insulating material 13. .

Therefore, the water meter described above has the supply port 1b.
The fluid (water) that has flowed in through the strainer 1a is passed through the strainer 1a, and then passed through the inlet 3 of the bottomed cylinder 3.
It flows in from a and rotates the impeller 4. The fluid that has completed its work in this manner is discharged from the outlet 3b through the discharge port 1c.

On the other hand, when the impeller 4 rotates, the magnet 6 attached to the rotating shaft 4a of the impeller 4 also rotates, so that the electronic circuit 7 disposed directly above the magnet 6 adjusts the rotation speed of the magnet 6. is counted, converted into the amount of water consumed, and displayed on the liquid crystal display panel 8, as well as stored in the computer via the cable 14.

[Problems with background technology]

However, as mentioned above, the above-mentioned water meter is required to maintain a required lifespan for a certain period of time, and moreover, the above-mentioned electronic circuit 7
Although the atmosphere containing the electronic circuits 7 is sealed with O-rings 10 and epoxy resin adhesive, this alone is not sufficient to maintain sufficient airtightness over a long period of time.
It is also predicted that dew condensation will occur in the upper bottomed cylinder 6 in which the electronic circuit 7 is incorporated and corrode the electronic circuit 7, which poses a problem in terms of reliability.

[Purpose of invention]

The present invention has been developed in view of the above-mentioned circumstances, and is designed to seal the joints with low-melting glass and protect them by covering them with a protective frame, without using an O-ring. The present invention provides a water meter that protects electronic circuits in a completely airtight state for a long period of time, and that also aims to improve reliability.

[Summary of the idea]

In this invention, a frame body with a flange is provided at the opening of the upper bottomed cylindrical body that houses the electronic circuit of a water meter, and a transparent plate equipped with a terminal is made of low-melting glass inside the flange. A protective frame is provided on the outside of the frame, and the terminal is connected to the cable of the protective frame with a lead wire, and the recess of the protective frame located directly above the terminal is connected to the cable of the protective frame. It is constructed by filling the cavity with an insulating material.

[Example of idea]

Hereinafter, the present invention will be described with reference to an illustrated embodiment.

It should be noted that the present invention will be described with the same reference numerals attached to the same constituent members as in the above-described specific example.

In Fig. 1, Fig. 3 to Fig. 5, reference numeral 1
is a case main body having a supply port 1b and a discharge port 1c equipped with a strainer 1a, and a partition plate 2 is formed in the middle of the case main body 1,
A lower bottomed cylinder 3 is sunk in the middle of the case body 1 where the partition plate 2 is located. or,
A fluid inlet 3a and an outlet 3b are bored in the lower outer periphery of the lower bottomed cylinder 3, and a rotating shaft 4a of an impeller 4 rotates vertically within the lower bottomed cylinder 3. It is freely mounted on a shaft, and this rotating shaft 4a
A magnet 5 having N and S poles is integrally attached to the upper end of the holder. Further, a ring portion 6a is provided at the upper opening 3c of the lower bottomed cylinder 3 where the magnet 5 is located.
An electronic circuit 7 for counting the number of rotations of the magnet 5 is installed inside the upper bottomed cylinder 6 located directly above the magnet 5. .

On the other hand, the upper bottomed cylinder 6 above the electronic circuit 7 is attached with a liquid crystal display board 8 for displaying water consumption. A frame 15 having a ring-shaped flange 15a is fixed to the opening 6b in an airtight manner. Also, this collar part 15
A transparent plate 9 made of, for example, a disk-shaped transparent glass plate is melted and adhered to the inside of a to maintain airtightness with a low melting point glass 16. Furthermore, a portion of the transparent plate 9 has a plurality of (3
) small holes are drilled in each hole.
Each terminal 12 made of a composite wire made of Ni--Fe alloy is implanted by glass brazing with bead glass 19. Note that each terminal 1
One end of each terminal 2 is connected to the electronic circuit 7 via a lead wire 17a, and the other end of each terminal 12 is connected to the cable 14 through a lead wire 17b.

On the other hand, on the outside of the frame 15, there is a protective frame (cover member) 18 formed of, for example, a synthetic resin material.
A concave portion 18a is formed in a portion of the protective frame 18 located directly above each terminal 12. Further, an electrical insulating material 13 is filled and buried in the recessed portion 18a after the lead wire 17b is connected to the cable 14.

Therefore, in the present invention, the joint between the inner side of the flange 15a of the frame 15 and the transparent plate 9 is sealed with the low melting point glass 16, and each terminal 12 implanted in the transparent plate 9 is sealed. is sealed with bead glass 19 by glass brazing, so the electronic circuit 7 housed in the upper bottomed cylindrical body 6 is protected in a completely airtight state for a long period of time. It's becoming like that.

Next, the embodiment shown in FIGS. 6 and 7 is as follows:
This is another embodiment of the present invention, in which a pair of ears 18b is formed on the upper part of the protective frame 18, a lid body 20 is pivotally attached to the ears 18b by a pin shaft 21, and an insulating material is A blind plate 1 is placed in the concave portion 18a filled with 13.
8c is added, and has the same content as the specific example described above.

[Effect of idea]

As described above, according to the present invention, the frame 15 having the flange 15a is provided in the opening 6b of the upper bottomed cylinder 6 that houses the electronic circuit 7 of the water meter, and the inside of the flange 15a is A transparent plate 9 provided with an alligator terminal 12 is closely fixed with a low melting point glass 16, and a protective frame body 18 is provided on the outside of the frame body 15,
The terminal 12 is attached to the cable 14 of this protective frame 18.
are connected with lead wires 17a and 17b, and the terminal 1
2, the concave portion 1 of the protective frame 18 is located directly above the protective frame 18.
8a is filled with the insulating material 13, the electronic circuit 7 housed in the upper bottomed cylinder 6 is kept completely airtight, so reliability can be improved. Not only is this possible, but it also has impact resistance and vibration resistance, and the number of component parts can be reduced, making it easy to assemble and saving labor through mass production.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a previously proposed water meter, FIG. 2 is a sectional view of a transparent plate incorporated into the water meter, and FIG. 3 is a plan view of a water meter according to the present invention. FIG. 4 is a partially cutaway side view of the water meter of the present invention, FIG. 5 is an enlarged cross-sectional view of the same, and FIGS. 6 and 7 are each showing other embodiments of the present invention. It is a diagram. 1...Case body, 3...Lower bottomed cylinder, 4...
... Impeller, 5 ... Magnet, 6 ... Upper bottomed cylinder, 7
... Electronic circuit, 8 ... Liquid crystal display board, 9 ... Transparent plate, 12 ... Terminal, 13 ... Insulating material, 14 ... Cable, 15 ... Frame, 16 ... Low melting point glass,
17a, 17b... Lead wire, 18... Protective frame, 19... Bead glass.

Claims (1)

[Scope of utility model registration request] A frame body with a flange is provided at the opening of the upper bottomed cylindrical body that houses the electronic circuit of the water meter, and a transparent plate with a terminal is attached to the inside of the flange and fixed with low melting point glass. A protective frame is provided on the outside of the frame, the terminal is connected to the cable of the protective frame with a lead wire, and a recess of the protective frame located directly above the terminal is provided. A water meter characterized by having a portion filled with an insulating material.