JP3502453B2 - Mounting structure of counter cover in membrane gas meter - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a counter cover mounting structure for a membrane gas meter.

[0002]

2. Description of the Related Art Conventionally, in a membrane gas meter, a controller such as a seismic sensor and a counter for displaying a measured value are provided in an upper case portion, and these are covered with a counter cover.

As a conventional mounting structure for such a counter cover, as shown in FIG. 18, a counter cover 103 is arranged in front of an upper case 101 of a membrane gas meter with a gasket 102 interposed therebetween. In some cases, the counter cover 103 is attached to the upper case 101 by inserting and screwing a screw rod 106 into the screw hole 104 formed in the upper case 101 and the female screw hole 105 engraved in the upper case 101.

Further, as a method for providing a mark after the counter cover is attached as described above, as shown in FIG.
Wire 10 between upper case 101 and counter cover 103
There is a method of binding the wire through the wire 7 and attaching the indicia member 108 to the wire.

[0005]

In the above-mentioned conventional counter cover mounting structure, firstly, the work of forming the upper case 101 and then forming the female screw hole 105 therein,
After forming the counter cover 103, screw holes 10 are formed in the counter cover 103.
Since the work of drilling 4 is required, the number of man-hours increases and the manufacturing cost becomes high. Moreover, when mounting the counter cover, a large number of screw rods must be screwed by using a tool one by one. There is a problem that it takes time to install.

Secondly, as described above, the wire 107
In the method of indicating by using, there is a problem that the indicia work requires labor and that the wire and the indicia member are exposed to impair the appearance.

Therefore, an object of the present invention is to solve the above problems and to provide a mounting structure in which the mounting portion of the counter cover with respect to the upper case has a high sealing property.

[0008]

The present invention is for solving the above-mentioned problems, and the first invention according to claim 1 is to install a counter cover on the front surface of the upper case in the membrane gas meter, Locking surfaces (13a, 14) are formed on the outer surface of the front portion of the peripheral wall of the upper case (1), and the front surface of the peripheral wall of the upper case (1) is formed inside the peripheral wall (9) of the counter cover (7). Opposing sealing faces (16)
And a locking claw (17) having elasticity in a direction of locking the locking surface (13a, 14) is provided on the outer side of the counter cover (7) and the sealing surface (16) of the counter cover (7). The locking claw (17) of the counter cover (7) is locked to the locking surface (13a, 14) of the upper case (1) with a packing (15) interposed between the front surfaces of the peripheral walls of the upper case (1). And then
Moreover, the cross-sectional shape of the packing (15) is defined as the upper case.
It is characterized in that it is formed in a U-shape that fits in the front part of the peripheral wall of (1) .

According to a second aspect of the present invention, a recess (2) is formed on the outer surface of the peripheral wall (9) of the counter cover (7).
1) is formed, and the counter cover (7) and the upper case (1) are connected in the recess (21) with a machine screw (23), and for indicia so as to cover the machine screw (23). The cap (24) is fitted in the recess (21).

[0010]

[0011] A third invention according to claim 3, claim 1
Or projections on the front of 2 SL placing the packing (15) (15b)
Is integrally molded with the packing body, and the protrusion (15
b) is provided in series over the entire circumference of the packing.

[0012]

In the invention according to claim 1, the peripheral wall (9) of the counter cover (7) is located in front of the peripheral wall of the upper case (1), and the counter cover (7) is located on the upper case (1) side. When the locking claw (17) is pushed, the locking claw (17) is pushed open and slides on the outer surface of the peripheral wall of the upper case (1), and when the locking claw (17) reaches the locking surface (13a, 14), it is elastic. The locking claw (17) causes the locking surface (13a, 13a,
14) Fit and lock. That is, the snap-fit structure allows the counter cover (7) to be attached to the upper case (1).

Further, since the packing (15) is interposed between the front surface of the peripheral wall of the upper case (1) and the sealing surface (16), the airtightness of the mounting portion between the upper case (1) and the counter cover (7) is achieved. Sex is secured. Furthermore, packing (15)
Is formed into a U shape and is fitted to the front part of the peripheral wall of the upper case (1).
Before mounting the counter cover (7),
Fit the packing (15) to the upper case (1) side and hold it.
You can Therefore, in the case of a flat gasket
To prevent the gasket from being displaced during installation.
One has to install the counter cover.
However, in the present invention, such a situation does not occur, and
The installation work of the cover (7) becomes easy.

According to the second aspect of the present invention, after the counter cover (7) is fitted into the upper case (1), the machine screw (23) is screwed on, and the indicia cap (24) is provided with the recess (2).
1) Fit inside. As a result, the machine screw (23) is covered by the indicia cap (24). Also, when the indicia cap (24) and the machine screw (23) are removed by mischief and the counter cover (7) is removed, a scar of removal remains on the indicia cap (24), whereby mischief can be found, Demonstrate the indicia function.

[0015]

According to the third aspect of the present invention, the counter cover (7) is attached so that the sealing surface (16) is provided.
Presses it against the protrusion (15b) of the packing (15) by slightly crushing it. Therefore, compared with a packing having a wide flat sealing surface, good sealing can be performed even if the sealing surface has a processing error.

[0017]

EXAMPLE A first example of the present invention shown in FIGS. 1 to 13 will be described below. Reference numeral 1 denotes an upper case of a membrane gas meter, which is fixedly mounted on an upper portion of a lower case 2 which incorporates a measuring unit such as a membrane. On the front side of the peripheral wall of the upper case 1,
A bank-shaped cover mounting portion 3 protruding forward from the upper case body is integrally formed with the upper case body by die casting. In FIG. 6, 3a is an upper mounting portion, 3a
Reference numeral b indicates a lower mounting portion, 3c indicates a left mounting portion, and 3d indicates a right mounting portion. And the wall thickness of each of these mounting portions 3a to 3d is
It is formed thicker than the wall thickness of the constituent wall of the upper case 1.

Reference numeral 4 denotes a controller board, which is located inside the cover mounting portion 3 and fixed to the upper case 1. The controller board 4 has a shutoff valve switch 5a, a vibration sensor 5b, a transmitter 5c and the like. Is attached, and the counter 6 is further attached.

A counter cover 7 includes a front wall 8 and a peripheral wall 9.
Are integrally molded, and the rear surface is opened, and the peripheral wall 9 is fitted to the cover mounting portion 3 of the upper case 1 to form the storage chamber 10 between the counter cover 7 and the controller board 4. The transmitter 6 and the counter 6 are formed and housed and covered. The counter cover 7
Is formed of a material having elasticity, that is, flexibility and resilience, for example, a synthetic resin material. Reference numeral 11 denotes a window formed on the front wall 8 of the counter cover 7, which is provided with a transparent plate 12 so that the numerical value of the counter 6 can be seen.

Next, the mounting structure of the counter cover 7 on the upper case 1 will be described in detail. The lower mounting portion 3b and the left and right mounting portions 3 in the cover mounting portion 3 of the upper case 1 described above.
c and 3d are each formed with a concave fitting groove 13 as shown in FIG. 5 located on the outer surface of the rear part thereof, and each fitting groove 13 is located on the same vertical plane and is continuous. Is formed in.

As shown in FIGS. 2 and 3, on the outer surface of the rear portion of the upper mounting portion 3a, there is formed a locking surface 14 that is recessed inwardly in a stepwise manner. The groove 13 is formed so as to be located on the same vertical plane as the front locking surface 13a.

The front portion of each of the mounting portions 3a to 3d is shown in FIG.
As shown in, a packing fitting portion 3f having a cutout step portion 3e is formed on the outer surface thereof. Reference numeral 15 is a packing made of an elastic material, for example, a rubber material, the cross-sectional shape of which is a U-shape with the rear surface opened as shown in FIG. 5, and the inner diameter of which is a dimension that fits tightly to the packing fitting portion 3f. Has been formed. Further, as shown in FIG. 8, the front surface thereof is formed in a square shape which is successively fitted to the packing mounting portion 3f of each of the mounting portions 3a to 3d. And the packing 1
When 5 is fitted into the packing fitting portion 3f, the outer peripheral surface 15a of the packing 15 is flush with the outer peripheral surface 3g of the cover mounting portion 3 as shown in FIG.

A protrusion 15b is integrally formed on the front surface of the packing 15 by the same material as the packing body, and the projection 15b is formed continuously over the entire front surface of the packing 15 as shown in FIG. Has been done.

Further, the cross-sectional shape of the protrusion 15b is formed in a substantially semicircular shape as shown in FIG. 9 in the straight portion except the corner portion (E portion in FIG. 8) of the packing 15, and in the corner portion E, 10 and the protrusion 15 as shown in FIG.
The outer edge of the straight portion is bulged more than the outer edge of the straight portion to form a wide projection having a bulged portion 15c. By forming the corner portion of the protrusion 15b to have a wide width in this way,
The durability of the protrusion 15b in the corner portion E can be improved.

12 and 13 show another embodiment of the protrusion 15b. That is, as shown in FIG. 13, the cross-sectional shape of the above-mentioned corner portion E of the protrusion 15b is formed as a right-angled triangle in which the surface 15d located inside the packing 15 is a vertical surface. According to this cross-sectional shape, when the protrusion 15b is pressed by the counter cover 7 as described above, the protrusion 15b is deformed so as to fall inside the corner portion E as shown by the chain line in FIG. That is, the corner portion is deformed toward the compression side of the molding material, and the durability of the protrusion 15b can be improved. The cross-sectional shape of the protrusion 15b in the straight line portion other than the corner portion may be the right triangle as described above, an isosceles triangle, or another shape.

As shown in FIG. 7, the peripheral wall 9 of the counter cover 7 has upper and lower side walls 9a and 9b and left and right side walls 9c and 9c.
9d, and each of the walls is formed in the sectional shape shown in FIG. That is, the base portion 9e is formed thick, and the recessed portion into which the packing 15 fitted as described above and the cover mounting portion 3 fit is formed in the inner rear portion thereof, and the sealing surface 16 formed of the vertical surface and the outside of the base portion 9e are formed. A thin-walled extension wall 9f is integrally formed so as to project rearward from the wall. The inner surface 9g of the extension wall 9f is formed to have the same diameter as the outer peripheral surface 3g of the peripheral wall 3 so as to be closely fitted to the outer peripheral surface 3g of the peripheral wall 3.

Reference numeral 17 is a locking claw, which is integrally formed at the rear end of the extension wall 9f toward the inside and has a rear surface 1
7a is a curved surface. The position where the locking claw 17 is formed is
The distance between the claw surface 17b and the seal surface 16 is slightly shorter than the distance between the tip of the protrusion 15b and the locking surface 13a of the packing 15 before pressing which is fitted into the packing fitting portion 3f. Is set.

Further, the lateral width L of the locking claw 17 (fitting groove 13
The length in the groove direction) is set as shown in FIG. 7, and the locking claws 17 are partially provided in the circumferential direction of the circumferential wall 9. Figure 7
In the embodiment shown in FIG. 2, two pieces are provided on the upper wall 9a and the lower wall 9b side at substantially equal intervals, and one piece is provided on each of the left and right walls 9c and 9d side at the center thereof. Incidentally, this locking claw 17
The lateral width L, the position and the number of are not limited to the state of the above-described embodiment, and are determined as necessary.

In the figure, 18 is a gas inflow pipe and 19 is a gas outflow pipe. Next, the mounting operation of the counter cover in the first embodiment will be described. First, the packing 15 is fitted over the entire circumference of the packing fitting portion 3f formed on the upper case 1 side.

Next, the upper and lower side walls 9a of the counter cover 7,
9b and the extension walls 9f of the left and right side walls 9c and 9d are positioned outside the cover mounting portion 3 of the upper case 1, and the counter cover 7 is pressed toward the upper case 1. Then,
The curved rear surface 17a of each locking claw 17 hits the outer end of the packing 15 to guide the locking claw 17 outward, and accordingly, each extension wall 9f is pushed outward. When the counter cover 7 is further pressed, the claw tip of the locking claw 17 slides on the outer peripheral surface 15a of the packing 15 and the outer peripheral surface 3g of the peripheral wall, and the claw tip of the locking claw 17 reaches the fitting groove 13. Then,
Due to the restoring force accumulated in each extension wall 9f, each extension wall 9f is reduced in diameter to its original shape, and each locking claw 17 is fitted into the fitting groove 13 and the locking surface 1.
Fits in 4 parts. By the locking of the locking claws 17, the counter cover 7 is prevented from coming off from the front, and the counter cover 7 is firmly fixed and held to the upper case 1.

Therefore, the counter cover 7 can be fitted into the upper case 1 simply by pressing it, and the mounting work can be performed very easily. Each locking claw 17 has a fitting groove 1
When the engaging surfaces 13a and 3 of FIG.
The distance between b and the seal surface 16 is set to be slightly shorter than the distance between the locking surface 13a and the tip of the protrusion 15b of the packing 15 before pressing, so that the seal surface 16 pushes the protrusion 15b slightly. Press in the crushed state. In this way, by performing line-contact sealing with the protrusion 15b, it is possible to secure high sealing performance even if there is a processing error in the seal portion, compared to the case where surface-contact sealing is performed with a wide flat surface. . Further, as described above, when the packing 15 is pressed, it is pressed against the packing fitting portion 3f, and airtightness is secured between the packing 15 and the packing fitting portion 3f.

Next, the counter cover 7 is attached to the upper case 1 in order to repair the controller and the counter and replace parts.
In order to remove the counter cover 7 from above, the locking claw 17 of the counter cover 7 is lifted up by a jig so as to be removed from the fitting groove 13 and the locking surface 14, and the extension wall 9f thereof is expanded outward to bring the counter cover 7 to the front. Pull to remove from upper case 1. At this time,
Unlike the engaging groove 13 like the other engaging surface 13a, the engaging surface 14 on the side of the upper side wall 9a is formed stepwise as shown in FIG. The work of removing the claw 17 can be easily performed.

Next, the second embodiment of the present invention shown in FIGS.
Examples will be described. The second embodiment has a structure in which a mark is applied to the structure of the first embodiment.

As shown in FIG. 14, the upper mounting portion 3a of the cover mounting portion 3 of the upper case 1 is extended slightly rearward at the center portion in the left-right direction, and the extended portion 3a 'has
As shown in FIG. 17, screw holes 20 are formed from the upper surface.

At the central portion of the upper side wall 9a of the counter cover 7 in the left-right direction, an extension wall 9f thereof is slightly projected rearward, and a concave portion 21 is formed in this protruding portion 9h. Further, a hole 22 is formed through the center of the bottom of the recess 21, so that when the counter cover 7 is fitted in the upper case, the hole 22 and the screw hole 20 are aligned with each other.
The recess 21 and the hole 22 are formed at the same time when the counter cover 7 is formed.

Reference numeral 23 is a small screw, which is screwed into the screw hole 20 through the hole 22 and the head portion 23a thereof is housed in the recess 21.

Reference numeral 24 denotes an indicia cap, which is molded from a synthetic resin material, has a height equal to the depth of the recess 21, and an outer diameter of which can be press-fitted into the inner peripheral surface of the recess 21. A storage chamber 24a for storing the head portion 23a of the machine screw 23 is formed in the inside thereof with its lower surface opened.

The other structures are the same as those of the first embodiment, and the same members and the same parts are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment,
In order to mount the counter cover 7, first, as in the first embodiment, the counter cover 7 is fitted to the front portion of the upper case 1 and the locking claws 17 thereof are fitted on the locking groove 13 and the locking surface 14. Lock it.

Next, the machine screw 23 is screwed into the screw hole 20 on the upper case 1 side through the hole 22 on the counter cover 7 side to connect the counter cover 7 and the upper case 1. Next, the indicia cap 24 is press-fitted into the concave portion 21, and the indicia cap 24 covers the head portion 23a of the machine screw 23. By this fitting, the upper surface of the indicia cap 24 and the upper surface of the protruding portion 9h on the counter cover 7 side are flush with each other.

When the gas meter is installed in the customer with the indicia cap 24 attached in this way, and then the indicia cap 24 is removed by mischief, the scar of removal is left on the indicia cap 24, and the mischief is left. Can be confirmed and the indicia function can be demonstrated.

According to the second embodiment, like the first embodiment, the counter cover 7 can be easily attached, and the work of applying the indicia can be accomplished by screwing one small screw 23 and the indicia cap 24. The press-fitting operation can be performed, and the work of attaching the counter cover 7 including the work of indicia becomes easy.

Further, the counter case 7 is attached to the upper case 1 more firmly by the connection with the small screws 23.

[0043]

As described above, according to the first aspect of the present invention, it is not necessary to form holes in the upper case and the counter case after molding, which is seen in the conventional mounting with screws, and the number of steps is reduced. Therefore, the manufacturing cost can be reduced. In addition, the counter cover can be attached by simply pressing it toward the case side, and the attaching work becomes extremely easy as compared with the conventional attaching using the screw rod. Furthermore,
Fit the packing to the cover mounting part of the upper case and hold it.
The counter cover can be attached easily because it can be installed
become.

According to the second aspect of the invention, the counter cover can be easily attached as described above, and in order to apply the indicia, one small screw is screwed and the indicia cap is fitted. Therefore, the work of applying the indicia is easier than the conventional wire. Moreover, since the machine screw can be covered with the indicia cap, the external appearance is extremely better than that of the conventional one in which the wire and the indicia member are exposed in a protruding manner, which is effective in improving the aesthetic appearance of the gas meter.

According to the third aspect of the present invention, the protrusion formed on the packing improves the sealing performance, ensures the airtightness of the mounting portion between the upper case and the counter cover, and reliably prevents the leakage of gas.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a sectional view taken along line BB in FIG.

FIG. 4 is a cross-sectional view taken along the line CC in FIG.

5 is an enlarged plan sectional view of a mounting portion of the counter cover in FIG.

FIG. 6 is a front view of the upper case with the counter cover removed.

FIG. 7 is a rear view of the counter cover.

FIG. 8 is a front view of the packing.

9 is an enlarged cross-sectional view taken along line DD of FIG.

FIG. 10 is an enlarged front view of a corner portion of the packing.

11 is a sectional view taken along line FF of FIG.

FIG. 12 is an enlarged front view of a corner portion showing another example of packing.

13 is a sectional view taken along line F′-F ′ of FIG.

FIG. 14 is a plan view showing a second embodiment of the present invention.

FIG. 15 is a side view of the same.

16 is a sectional view taken along line GG in FIG.

FIG. 17 is an enlarged side sectional view of the indicia portion in FIG.

FIG. 18 is a partially cutaway side view showing a conventional mounting structure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Upper case 3 ... Cover attachment part 7 ... Counter cover 9 ... Perimeter wall 9h ... Projection part 13 ... Fitting groove 13a, 1
4 ... Locking surface 15 ... Packing 15b ... Protrusion 16 ... Sealing surface 17 ... Locking claw 21 ... Recess 23 ... Machine screw 24 ... Marker cap

Front page continuation (72) Inventor Katsuhisa Hanaki 1-270, Sennaku, Atsuta-ku, Nagoya-shi, Aichi Aichi Clock Electric Co., Ltd. (72) Noriyuki Watanabe 1-270, Sennen-ku, Nagoya, Aichi Within Aichi Clock Electric Co., Ltd. (56) References: Kaihei 2-63423 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01F 1/00-9/02

Claims (3)

(57) [Claims] 1. A membrane gas meter having a counter cover attached to the front surface of an upper case, wherein a locking surface (13a, 1a) is provided on an outer surface of a front portion of a peripheral wall of the upper case (1).
4) is formed, a seal surface (16) facing the front surface of the peripheral wall of the upper case (1) is formed inside the peripheral wall (9) of the counter cover (7), and the locking surface (16) is formed outside. 1
3a, 14) locking claws (1 having elasticity in the direction of locking
7) is provided in a protruding manner, and a locking claw (7) of the counter cover (7) is interposed with a packing (15) interposed between the sealing surface (16) of the counter cover (7) and the front surface of the peripheral wall of the upper case (1). 17) is locked to the locking surfaces (13a, 14) of the upper case (1) , and the packing (15) is traversed.
C-shape that fits the surface shape to the front part of the peripheral wall of the upper case (1)
A counter cover mounting structure for a membrane gas meter, which is characterized in that the counter cover is formed into a shape . 2. A recess (21) is formed on the outer surface of the peripheral wall (9) of the counter cover (7) according to claim 1, and the counter cover (7) and the upper case (1) are formed in the recess (21). Of the counter cover in the membrane gas meter, characterized in that the indicia cap (24) is fitted to the recess (21) so as to cover the machine screw (23). Mounting structure. 3. A process according to claim 1 or 2 SL placing the packing (15)
A mounting structure for a counter cover in a membrane gas meter, characterized in that a projection (15b) is integrally formed on the front surface of the packing body with the packing main body, and the projection (15b) is provided in series over the entire circumference of the packing.