JPH0225134Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is based on a dry gas meter, in particular, in which all of the four gas branch channels that communicate the four fan-shaped holes in the valve seat and the four measuring chambers are constrained by the left and right wing axes. This has been improved so that the end openings can be made larger.

First, an outline of a dry gas meter will be explained with reference to FIGS. 1 to 3.

In FIGS. 1 to 3, the dry gas meter is roughly divided into a lower case 1, a valve seat 2, a crank mechanism 3, a rotary valve 4, and an upper case 5.

The lower case 1 has left and right chambers 6a, 6b (6a is not shown in the drawing and is used for convenience of explanation) formed separately from each other on the left and right sides thereof, and inner and outer measuring chambers 7a, 7b, 8a, 8b, respectively. A pair of diaphragms 9 (only the right diaphragm is shown)
and a pair of left and right wing axes 10a, 10b arranged in a point-symmetrical relationship that respond to the expansion and contraction of these diaphragms.
to include.

That is, in FIG. 2, only an exploded view of the right ventricle is shown to simplify the drawing since the structures of the left and right ventricles are substantially the same, but the left and right ventricles 6a and 6b are separated by the central partition wall 11. There is. The inner metering chamber 7a of the right ventricle is defined by a substantially circular recess formed in the lower case 1, while the outer metering chamber 8b of the right ventricle is attached to the lower case 1 by a plurality of screws 12. These inner and outer metering chambers 7a, 8 of the right ventricle are defined by a substantially circular recess in the side plate 13.
a are separated by a diaphragm 9 interposed therebetween.

The diaphragm 9 has a packing (not shown) integrally formed around its outer periphery that is fitted into an annular groove 14 formed in the lower case 1, and the outer periphery of the diaphragm 9 is tightened by the side plate 13, so that the right ventricle is closed. The inner and outer measuring chambers 7a and 8a are completely isolated.

The diaphragm 9 also has a protruding edge 16 defining a gas passage 15 on a part of its outer circumference, and this protruding edge 16 is fitted into a groove 17 formed in the lower case 1 so as to communicate with the groove 14 . Gas passage 15 is located in lower case 1
The end opening 18 of the gas branch flow path formed in the outer measuring chamber 8a is made to communicate with the outer measuring chamber 8a.

The diaphragm 9 is further held at its center by inner and outer belly plates 19, and its inner double plate (not shown) and the lower end 10'a of the right wing shaft 10a are connected by a connector not shown. and diaphragm 9
The right wing shaft 10a rotates in response to the expansion and contraction of the right wing. The two holes 20 formed in the lower end portion 10'a of the right wing shaft are for fixing the connector.

Left and right wing axes 10a arranged in a point symmetrical relationship,
10b is rotatably inserted into hollow cylindrical portions 21a and 21b integrally formed in the lower case 1, respectively.

The valve seat 2 is arranged so as to close the upper end opening side of the lower case 1, and has a central hole 22 in its center and one independent fan-shaped hole 23a to 23d formed around the outer periphery of the central hole. . These four fan-shaped holes 23a to 23d are communicated with the four inner and outer measuring chambers of the left and right chambers described above through four independent gas flow channels, and one feature of the present invention is in the manner of communication. Therefore, this point will be explained in detail later.
The valve seat 2 also has an exhaust pipe attachment hole 24 on one side thereof.

The crank mechanism 3 has left and right wing shafts 10a and 10b that respond to the expansion and contraction of a pair of diaphragms 9 based on the intake and discharge of gas into the four measurement chambers described above.
The movement is transmitted to the rotary valve 4 to rotate this valve, and at the same time, an integrating mechanism (not shown) provided in the upper case 5 is operated.

That is, the movements of the left and right wing axes 10a, 10b are as follows:
Links 25a fixed to the upper ends of these wing axes, respectively.
25b, links 26a and 26b rotatably connected to these links, and links 27 and 26b and 2 rotatably connected between these links.
A pin 28 is provided at the connection with the rotary valve 7 and engages in the slot 29 of the rotary valve 4.
(see FIG. 1) to the valve 4, thereby causing the valve 4 to rotate.

On the other hand, a link 30 further rotatably connected to the connecting portion between the links 26a and 27 has a rotating shaft 31.
This allows the rotary shaft 31 to rotate in the same manner as the valve 4 by the movement of the left and right wing shafts 10a, 10b. The rotation of the rotating shaft 31 is caused by a gear 32 fixed to the rotating shaft, a gear 33 meshing with the gear, a rotating shaft 34 to which the gear is fixed, a worm 35 fixed to the rotating shaft, and a worm 35 fixed to the rotating shaft. The transmission is transmitted to the worm gear 36 meshing with the worm gear, the rotating shaft 37 to which the worm gear is fixed, and the lever 38 fixed to one end of the rotating shaft, and as the lever rotates, the signal is transmitted through its pin 39. This activates the integration mechanism. In addition, three rotating shafts 31, 34
and 37 are each rotatably supported by a support stand 53, which is fixed to the upper end surface of the lower case 1 with screws.

The upper case 5 has an inlet cap 40 and an outlet cap 41.
and the above-mentioned integration mechanism, the exit cap 41
is connected to the exhaust pipe 42, and this pipe is connected to the mounting hole 24 of the valve seat 2 to form the exhaust passage 4.
9 (see FIG. 4 or 5). The upper case 5 is fixed to the lower case 1 with a plurality of screws 43, and covers the valve seat 2, the rotary valve 4, the left and right wing shafts 10a, 10b, the crank mechanism 3, and the exhaust pipe 42.
In order to prevent gas from leaking to the outside from the joint between the upper and lower cases, an annular groove 4 is provided on the upper surface of the lower case 1.
4 is formed, and an annular packing (not shown) is fitted into this annular groove.

The operation of the dry gas meter described above will be summarized below.

Gas is introduced into the upper case 5 through the inlet mouthpiece 40. For example, as shown in FIG.
When facing 23c of 23d, it flows into the outer measuring chamber of the left ventricle among the four measuring chambers 7a, 7b, 8a, 8b through these fan-shaped holes 45 and 23c, inflating the left diaphragm, and In response, the left wing shaft 10b swings, operating the integrating mechanism and rotating the rotary valve 4 in the manner described below.

During this action, the gas filling the inner metering chamber of the left ventricle on the opposite side flows through the fan-shaped hole in the valve seat 2.
3d, an upper closed fan-shaped space 46 formed on the lower surface of the valve 4 in point symmetry with the fan-shaped hole 45, an upper closed central space 47 located between these parts 45 and 46 and communicating with the space 46, the valve; A central circular hole 22 is formed on the inner periphery of the four fan-shaped holes in the sheet 2.
through the exhaust passage 49 (see Fig. 4 or 5) provided below the valve seat 2 of the lower case 1,
Thereafter, the air is exhausted through the exhaust pipe 42 and outlet mouthpiece 41 provided in the hole 24 of the valve seat 2.

Thereafter, by rotating the rotary valve 4, this valve and the other three fan-shaped holes in the valve seat 2 are used to switch between introducing and discharging gas into each of the other three metering chambers.

The rotary valve 4 is rotatably supported by a rod 50, which is erected on the circular left side of the exhaust passage 49 and projects into the center of the central circular hole 22 of the valve seat 2.

By the way, regarding the communication between the four fan-shaped holes in the valve seat and the four metering chambers, conventionally, a gas branch flow path as shown in FIG. 5 has been adopted.

That is, when the valve seat 2 is installed in the lower case 1 (see FIG. 2), the first fan-shaped hole 23a located closest to the right wing shaft 10a is
The second sector-shaped hole 23b located closest to the left wing shaft 10b is connected to the outer metering chamber 8a of the right ventricle through the gas branch passage 51'a.
1′b communicates with the inner metering chamber 7a of the right ventricle;
The third sector-shaped hole 23c located between the first and second sector-shaped holes and located on the left ventricular side is connected to the third gas branch flow path 51.
c communicates with the outer metering chamber 8b of the left ventricle, and the fourth sector-shaped hole 23d located between the first and second sector-shaped holes and located on the right ventricular side is connected to the fourth gas branch flow path 5.
1d communicates with the inner metering chamber 7b of the left ventricle.

In FIG. 5, 52'a indicates the end opening of the first gas branch flow path 51'a that opens to the outer metering chamber of the right ventricle, and 52'b indicates the end opening of the first gas branch flow path 51'a that opens to the inner metering chamber of the right ventricle. 52c indicates the end opening of the third gas branch passage 51'b that opens to the outer metering chamber of the left ventricle;
d indicates the end opening of the fourth gas branch flow path 51d that opens into the inner metering chamber of the left ventricle.

In addition, in FIG. 5, these gas branch flow paths 5
1'a, 51'b, 51c, 51d and exhaust passage 4
The valve seat 2 (see FIG. 2) is glued onto the top surface of each partition wall that partitions the fan-shaped holes 23a and 23c. (not shown), and the partition is adhered to this cover. Therefore, the fan-shaped holes 23a and 23c of the valve seat 2 are similar to the other fan-shaped holes 23b and 23.
Similar to d, this structure does not communicate with the exhaust passage 49.

However, in such a conventional gas distribution channel, the first fan-shaped hole 23a is connected to the outer measuring chamber 8a of the right ventricle.
When creating the first gas branch passage 51'a that communicates with the right wing shaft 10a, it is necessary to form it through the side of the hollow cylindrical part 21a of the lower case 1 that houses the right wing shaft 10a. It was not possible to make the end opening 52'a of the right ventricle to the outer measurement chamber very large.

Therefore, in the conventional dry gas meter, the other three end openings 52'b, 52c, and 52d are set to have the same size as this end opening 52'a, so that the gas inflow into each measuring chamber is reduced. This limits the amount of gas that can be measured and reduces the measurement range, which hinders the miniaturization of gas meters.

The reason why the end openings of the four gas distribution channels to the four measuring chambers are all made the same size is to equalize the amount of gas flowing into the four measuring chambers, so that the amount of expansion and contraction of the left and right diaphragms is equal. It lies in making them equal.

In addition, in the conventional dry gas meter, the end openings 52'a, 52 of the two gas branch flow paths 51'a, 51c leading to the left and right outer measuring chambers 8a, 8b.
c are not provided in a point-symmetrical relationship, the left and right side plates 1 of the lower case 1 where these end openings are formed.
3 cannot be made to have the same shape, and therefore these side plates must be manufactured separately, which has the disadvantage of increasing costs.

The present invention aims to eliminate such conventional drawbacks.

As best shown in FIGS. 1 to 4, particularly in FIG.
The first sector-shaped hole 23a located closest to the right ventricle is connected to the inner metering chamber 7a of the right ventricle through the first gas branch flow path 51a, and the second sector-shaped hole located closest to the left wing shaft 10b 23b as the second gas branch flow path 51
b communicates with the outer measuring chamber 8a of the right ventricle, and the first
and a third sector-shaped hole 23c located on the left ventricular side between the second sector-shaped hole and communicated with the outer metering chamber 8b of the left ventricle through a third gas branch flow path 51c, and The fourth sector-shaped hole 23d located between the sector-shaped holes and located on the right ventricular side is connected to the fourth gas distribution channel 51d.
The end openings 52b, 52c of the second and third gas branch flow paths 51b, 51c communicate with the inner metering chamber 7b of the left ventricle and lead to the left and right outer metering chambers 8a, 8b.
are formed near both diagonal corners of the lower case 1 where the left and right wing shafts 10a and 10b are not arranged,
1st and 4th leading to left and right inner measuring chambers 7a, 7b
The end openings 52a of the gas branch flow paths 51a and 51d,
52d is formed near the center of the lower case 1.

That is, in the present invention, the four fan-shaped holes 23a to 23d of the valve seat 2 and the four measuring chambers 7a, 7b, 8a, and 8b of the lower case 1 are connected as described above by the four gas distribution channels 51a to 51d. By communicating at The end opening 52b (corresponding to the end opening 18 in FIG. 2) can be enlarged without being restricted by the right wing shaft 10a, and thereby the other three gas branch channels 51
Each end opening 52a, 52 of a, 51c, 51d
Similarly, c and 52d can be made large to increase the amount of gas flowing into each measuring chamber, thereby expanding the measurement range and greatly contributing to downsizing of the gas meter.

Further, according to the present invention, the left and right outer measuring chambers 8
Two gas branch channels 51b, 51 leading to a, 8b
Since the end openings 52b and 52c of c can be provided in a point-symmetrical relationship, the left and right side plates 13 (see FIG. 2) of the lower case 1 where these end openings are formed can have the same shape, Therefore, it is only necessary to manufacture one type of side plate by making the left and right side plates common, which can greatly contribute to cost reduction of the gas meter.

In addition, in FIG. 4, these gas branch flow paths 51a, 51b, 51c,
51d and the valve seat 2 bonded onto the top surface of each partition wall that partitions the exhaust passage 49 (see FIG. 2).
has an integral cover (not shown) that covers a portion of the exhaust passage 49 located under the partition that partitions the fan-shaped holes 23a and 23c, and the partition is bonded to this cover. Therefore,
The fan-shaped holes 23a and 23c of the valve seat 2, like the other fan-shaped holes 23b and 23d, are connected to the exhaust passage 4.
The structure is such that it is not connected to 9.

[Brief explanation of the drawing]

Figure 1 is a front view of a dry gas meter embodying the present invention with the upper case separated, Figure 2 is an exploded view of the main parts of the gas meter in Figure 1, and Figure 3 shows the rotary valve in the gas meter in Figure 2. 4 is a cross-sectional view showing the relationship with the valve seat; FIG. 4 is a diagram showing a gas branch flow path connecting the four fan-shaped holes of the valve seat in the gas meter of FIG. 1 to the four measuring chambers of the left and right chambers;
FIG. 5 is a diagram similar to FIG. 4 of a conventional gas meter. 2...Valve seat, 3...Crank mechanism, 4
...Rotary valve, 6a, 6b...Left and right chamber, 7
a, 7b...Inner measuring chamber, 8a, 8b...Outer measuring chamber, 9...Diaphragm, 10a, 10b...
Left and right wing axes, 23a to 23d...Valve seat 4
Two fan-shaped holes, 51a to 51d...Gas branch flow path, 5
2a to 52d...end openings.

Claims (1)

[Scope of utility model registration request] Left and right chambers formed separately on the left and right sides of the lower case 1 are respectively inner and outer measuring chambers 7a, 7b, 8a, 8b.
A pair of left and right wing shafts 10a arranged in a point symmetrical relationship responds to the expansion and contraction of a pair of diaphragms 9 that partition the
10b rotates the rotary valve 4 via a link mechanism, and four independent fan-shaped holes 23a, 23b, 23 arranged in a circular shape under the same valve and facing the said valve are rotated by the movement of the rotary valve 4.
In the dry gas meter, gas is introduced into and discharged from each of the measuring chambers by means of a valve seat 2 having a valve seat 2 having a diameter of 1.c and 23d. Regarding the first fan-shaped hole 23a located closest to the right wing shaft 10a, the first sector-shaped hole 23a is connected to the inner metering chamber 7a of the right ventricle through a first gas flow path 51a, and the first fan-shaped hole 23a located closest to the left wing shaft 10b is connected to the inner metering chamber 7a of the right ventricle. The second sector-shaped hole 23b located at A third sector-shaped hole 23c located in the left ventricle is connected to the outer measuring chamber 8b of the left ventricle through a third gas flow path 51c, and a third sector-shaped hole 23c located between the first and second sector-shaped holes is connected to the right ventricular side. The fourth fan-shaped hole 23d located in is connected to the inner measuring chamber 7b of the left ventricle through a fourth gas branch flow path 51d, and the left and right outer measuring chambers 8a,
The second and third gas branch flow paths 51 leading to 8b
The end openings 52b, 52c of the left and right wing shafts 10a, 10b are formed near both diagonal corners of the lower case 1 where the left and right wing shafts 10a, 10b are not arranged, and the left and right inner measuring chambers 7a, 7b said first leading to
A dry gas meter characterized in that end openings 52a and 52d of the fourth gas branch flow paths 51a and 51d are formed near the center of the lower case 1.