JPH0219699Y2 - - Google Patents

Description

[Detailed explanation of the invention] - Industrial application field This invention forms an instrument room for pressure sensors, printed circuit boards, seismic sensors, shutoff valves, etc. in the upper part of the gas meter body, and the back side of this instrument room is completely open. The present invention relates to a gas meter back cover device configured such that the pressure sensor, printed circuit board, etc. are installed through this opening, and then the opening is completely closed by the back cover.

・Conventional technology and its problems Modern gas meters not only have a measuring function, but also have the ability to prevent gas accidents in the event of an abnormal flow rate or a continued flow rate that is considered to be abnormal, or in the event of an earthquake of a specified seismic intensity or higher. For the purpose of prevention, emergency shutoff instruments have been incorporated.

For the purpose of protection, these instruments are built into an instrument chamber 02 with a die-cast body at the top of the gas meter main body 01, with only the back side fully open, as shown in Fig. 10, and the back cover 0.
However, since there is a pressure sensor 03 in the instrument chamber 02, a ventilation hole 05 is provided in the back cover 04 to communicate with the atmosphere.

For this reason, rainwater enters the control room 02 through the ventilation hole 05, causing various electrical troubles.

・Purpose of this invention The purpose of this invention is as follows.

a. Prevent rainwater from entering the instrument room via the ventilation holes.

b. Condensation water generated in the instrument room can be easily discharged from the ventilation holes.

c. The dew water can be drained even if the gas meter is installed at an angle.

d. Prevent insects from entering the instrument room through the ventilation holes.

・ Structure of this invention The configuration of the present invention is as follows.

In a gas meter configured such that an instrument chamber containing a pressure sensor, a printed circuit board, a seismic sensor, a shutoff valve, etc. is formed in the upper part of the meter body, and a fully open opening on the back side of the instrument chamber is closed by a back cover, The back of the case back is bulged out to form a bulge, and a horizontally long recess is formed in the center of the bulge and close to the bottom, and a ventilation hole is formed in the center of the recess. A back lid device for a gas meter, further comprising a cover that covers the recessed part from the outside in a watertight manner, and drain holes are provided at both ends of the cover at positions communicating with the recessed part.

As mentioned above, if a concave part is integrally formed on the back cover, a ventilation hole is provided in the center of this concave part, and drainage holes are provided on both sides of the cover that closes the concave part, the interior of the instrument compartment can be It communicates with the atmosphere, and even if rainwater enters the recess through the drainage hole, it will not reach the instrument room due to the distance to the ventilation hole.
In addition, by forming the ventilation holes and drainage holes vertically, even if dew water accumulates inside the ventilation holes,
There is no need to worry about the drain hole being blocked, thus ensuring ventilation with the interior, and if the gas meter is installed at an angle, dew water will be drained from either the left or right drain hole. .

Next, by making the ventilation holes and drainage holes vertically long, we ensured a sufficient opening area while increasing the width by 1.
By setting the diameter to about mm, it is possible to prevent insects from entering the instrument room.

・Example FIGS. 1 and 2 show a gas meter equipped with the above-mentioned back cover device of the present invention. 1 is a gas meter main body, 2 is an instrument room formed by a die-cast body on the upper part of the gas meter main body 1, and this instrument room is A pressure sensor 3, a seismic sensor 4, a flow rate transmitter 5, a printed circuit board 6, a shutoff valve 7, etc. are incorporated inside the device 2, and the back side is completely open.

In FIG. 3, reference numeral 8 designates a back cover that closes a fully open opening 2' on the back side of the control chamber 2, and this back cover bulges out to the rear. A horizontally long concave portion 9 is integrally formed by press working.

In addition, as a means for forming the concave portion 9, in addition to the above-mentioned embodiment, as shown in FIG.
A ventilation hole 10 may be provided at 1'.

Reference numeral 10 denotes a ventilation hole opened in the center of the recessed part 9, and this ventilation hole 10 is vertically long and has a width of 1 mm and a length of 10 mm.

11 is a cover that closes the recessed part 9;
Vertically long drainage holes 12, 12' each having a width of 1 mm and a length of 10 mm are provided on both sides of the cover 11.

In the above embodiment, the ventilation hole 10 and the drainage hole 1
The inside of the instrument room 2 is communicated with the atmosphere via 2 and 12', and the inside of the instrument room 2 is always maintained at atmospheric pressure.
As a result, the operation of the pressure sensor 3 is ensured.

Note that the ventilation hole 10 and the drainage holes 12, 12' are the third
As shown in the figure, it is possible to prevent rainwater from entering by separating them as much as possible, but if necessary, water-shielding walls 13 and 13' may be provided as shown in FIGS. 5 and 6. However, it goes without saying that the water-shielding walls 13, 13' should not impede ventilation.

Furthermore, for the same purpose, the ventilation hole 10 may be covered with a single water-shielding wall 13 as shown in FIG.

FIG. 8 shows an example of the formation of the ventilation hole 10 and the drainage holes 12, 12', in which a waterproof membrane is left in the holes during press working to prevent rainwater from penetrating straight through.

- Effects of the present invention As described above, the present invention forms a bulge on the back cover, forms a recess at the center bottom of the bulge, provides a ventilation hole in the center of the recess, and forms a recess. By closing the area with a cover and providing drainage holes on both sides of the cover, the following effects can be expected.

a The drainage hole is located farthest from the ventilation hole, so even if sprayed rainwater enters the recess, it will not enter the instrument room, making it completely waterproof.

b. Condensation water generated in the instrument room is completely drained from the ventilation hole via the drainage hole. Further, when draining water, if the vent hole and the drain hole are made vertically long, a ventilation space can be secured above the vent hole and the drain hole even during draining.

c. If the gas meter is installed at an angle, there are drainage holes on either side, so the dew water will be completely drained from either of them.

d By making the drain hole vertically long, the width can be reduced to prevent insects from entering, while still ensuring a sufficient opening area.

e By pressing the concave part on the back cover side, there is no seal part inside the concave part. As a result, the problem of rainwater intrusion due to poor sealing is completely eliminated, and the process is simple.

f By providing a water-shielding wall, it is possible to more completely prevent rainwater from entering.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the back cover of a gas meter implementing the present invention, Fig. 2 is a view of the instrument compartment with the back cover removed, Fig. 3 is a perspective view of the back cover, and Fig. 4 is a sectional view of the back cover. Figures 5 to 7 are perspective views of a part of the back cover showing an example of installing a water-shielding wall, Figure 8 is a perspective view of the back cover and cover showing an example of forming ventilation holes and drainage holes, and Figure 9 is a perspective view of a part of the back cover showing an example of how a water-shielding wall is attached. FIG. 10 is a sectional view of a back cover showing another embodiment in which a cover is attached to the inside to form a recessed portion, and FIG. 10 is a sectional view of a conventional back cover. 1... Gas meter, 2... Instrument room, 8... Back cover, 9... Recessed part, 10... Ventilation hole, 12, 1
2'...Drain hole, 13,13'...Waterproof wall.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An instrument room containing a pressure sensor, a printed circuit board, a seismic sensor, a shutoff valve, etc. is formed in the upper part of the meter body, and a fully open opening on the back side of this instrument room is opened with the back cover. In the gas meter configured to be closed, the back cover is bulged at the rear to form a bulge, and a horizontally long recess is formed in the center of the bulge and near the bottom. A gas meter back cover device comprising: a ventilation hole in the center of the recess; a cover that covers the recess in a watertight manner from the outside; and drainage holes communicating with the recess at both ends of the cover. . 2. The back lid device for a gas meter according to claim 1, which is a utility model registration, and comprises a water-shielding wall provided in the recessed portion between the ventilation hole and the drainage hole. 3. A back cover device for a gas meter according to claim 1, which is a utility model registered claim, wherein a drainage hole is formed on the back cover side, a cover with a recessed part is attached to the inside of the back cover, and a ventilation hole is provided in the center of the cover. . 4. The back cover device for a gas meter according to claim 1, wherein the ventilation holes and drainage holes are vertical grooves. 5. The back lid device for a gas meter according to claim 1, wherein the ventilation hole is covered with a waterproof plate to the extent that ventilation is not impaired.