JPH10293050A - Fluidic-type gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a meter, perform measurement as a plurality of meters by a single gas meter, and prevent the mounting posture of a gas meter body from being restricted by a rotary direction with a horizontal axis as a center in a fluidic-type gas meter with a pressure fluctuation elimination means for absorbing a pressure fluctuation being transferred from an upstream pipe. SOLUTION: A pressure fluctuation elimination means 37 with a valve body 42 that can be displaced in horizontal direction at a gas channel 34 and a diaphragm 43 is provided at a gas meter body 35 where the gas channel 34 is formed over a gas flow-out port 32 and a gas delivery port 33, a load due to a dead weight and a force required for operation when the diaphragm 43 is operated are reduced, the pressure reception area of the diaphragm 43 is reduced, and a configuration is miniaturized. Also, the pressure fluctuation elimination means 37 has a cylindrical body where a gas flow-out hole 87 for a large flow-rate meter and a gas flow-out hole 88 for a small gas flow-out meter are formed, is installed so that either one of the flow-out holes 87 and 88 of the cylinder can communicate with the gas channel 34, and switches the measurable maximum flow rate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidic gas meter, and more particularly, to an improvement of a fluidic gas meter capable of accurately measuring a small flow rate of, for example, about 3 liters / hour.

[0002]

2. Description of the Related Art FIG. 10 is a sectional view schematically showing the internal structure of a fluidic gas meter 1 which is a typical conventional technique. In the gas meter main body 1a of the fluidic gas meter 1, a gas flow path 24 communicating with the gas supply port 2 and the gas discharge port 5 is formed. In the vicinity of the gas outlet 5 of the gas flow path 24, a fluidic element that generates an alternating pressure change by passing gas,
Detect the frequency of the alternating pressure wave due to this alternating pressure change,
A measuring means 4 including a flow rate measuring device for calculating a gas flow rate from this frequency is interposed. Between the measuring means 4 and the gas supply port 2 in the gas flow path 24, a pressure fluctuation removing means 3 for absorbing a pressure fluctuation in the gas supply port 2 is provided.

In the gas meter main body 1a, a first pressure chamber 6 communicating with the gas supply port 2 between the gas supply port 2 and the gas discharge port 5, a second pressure chamber 7 provided with the pressure fluctuation removing means 3, A third pressure chamber 8 communicating with the second pressure chamber 7, a passage 9, and a storage space 10 in which the measuring means 4 is stored are formed in this order in a gas passing direction, and constitute the gas flow path 24. I have.

The pressure fluctuation removing means 3 provided in the second pressure chamber 7 has a casing 11, a valve body 12, a diaphragm 13, and a connecting shaft 14 connecting the valve body 12 and the diaphragm 13. The diaphragm 13 partitions the space in the casing 11 into a first space 15 and a second space 16, and the first space 15 has the valve body 12 and the connection shaft 14.
Is disposed, and the second space 16 communicates with the gas outlet 5 through the pressure introduction passage 17. The casing 11 is surrounded by a valve seat 18 on which the valve body 12 is seated, and has a valve hole 19 communicating the first space 15 and the space below the second pressure chamber 7.
And a through hole 20 formed in the peripheral portion of the valve hole 19 and communicating the first space 15 and the space below the second pressure chamber 7, and communicating the first space 15 and the first pressure chamber 6. A communication hole 21 is formed.

The axes of the valve body 12, the connecting shaft 14 and the diaphragm 13 are on a common straight line, and the diaphragm 13 is disposed near the upper portion 22 of the gas meter main body 1a. Thus, the valve body 12 is connected to the diaphragm 13 by the connecting shaft 14 at a lower position.

[0006] Such a fluidic gas meter 1
Are arranged with the gas supply port 2 and the gas discharge port 5 facing vertically downward. A gas transport pipe (not shown) is connected to the gas supply port 2, and a gas pipe connected to a gas consuming device is connected to the gas discharge port 5. The gas supplied to the gas supply port 2 is supplied to the first pressure chamber 6 at a pressure P1 substantially equal to the supply pressure.
Through the communication hole 21 of the pressure fluctuation removing means 3 to the first space 15. Therefore, the first space 15 also has the same pressure as the pressure P1 of the first pressure chamber 6. Second
Since the space 16 communicates with the gas outlet 5 through the pressure introduction passage 17, the pressure P <b> 2 in the second space 16 is equal to the pressure in the gas outlet 5.

In this state, when the gas is consumed by the gas consuming device, the pressure P2 of the gas discharge port 5 is changed to the gas supply port 2
And lower than the pressure P1 in the first pressure chamber 6, and P1
> P2, and the diaphragm 13 is lifted upward by this differential pressure, and the valve body 12 opens the valve hole 19.
When the valve hole 19 is opened in this manner, the first space 15
The gas inside flows through the valve hole 19 into the space below the second pressure chamber 7, is guided through the passage 9 through the third pressure chamber 8 into the measuring means 4, and the flow rate is measured. Is supplied to gas consuming equipment through a gas pipe.

The gas measurement value measured by the measuring means 4 is displayed on a display unit (not shown) provided in the fluidic gas meter 1 so that the gas usage can be measured. I have.

[0009]

In such a prior art, the gas meter 1 has the upper part 22 vertically upward and the lower part 23 vertically downward, and the gas supply port 2 is provided as described above.
Is connected to the gas transport pipe, and the gas outlet 5 is supported with the gas pipe connected thereto.
3 has its own weight and the weight of the valve body 12 and the connecting shaft 14 acting vertically downward. Therefore, in order to open the valve element 12, a differential pressure is required to raise the weight of the valve element 12, the diaphragm 13 and the connecting shaft 14. Therefore, the pressure receiving area of the diaphragm 13 increases, and the diameter of the diaphragm 13 increases. Must.

In the above prior art, the diaphragm 13 is actuated by the differential pressure based on the maximum flow rate that can be measured by the fluidic gas meter 1, and the valve body 12 is linked to the diaphragm 13 to open the valve hole 19. Is changed so that the pressure loss is allowed at the maximum flow rate.However, in order to fully open the valve body 12 at the time of a large flow rate, the maximum flow rate differs depending on the number of meters. The differential pressure between the first and second spaces 15, 16 (P1-
P2) is equally required, and if the maximum flow rate changes, the pressure loss of the gas flow path at the maximum flow rate changes. Therefore, the flow path resistance must be changed due to the difference in the pressure loss, and the meter is also used. There is a problem that you can not.

An object of the present invention is to provide a fluidic type gas meter in which the diaphragm is reduced in size to reduce the size of the device and the mounting posture of the gas meter body is not restricted in the vertical direction.

Another object of the present invention is to provide a fluidic type gas meter in which one gas meter can use different numbers of meters.

[0013]

According to the first aspect of the present invention, there is provided a gas meter main body having a gas flow path communicating between a gas supply port and a gas discharge port, and a gas passage interposed in the gas flow path. Measuring means for measuring the gas flow rate based on the alternating pressure change generated by the pressure fluctuation removing means which is interposed in the gas flow path on the upstream side of the measuring means in the gas passage direction and absorbs pressure fluctuation at the gas supply port. Wherein the pressure fluctuation removing means opens the valve hole when the pressure difference between the downstream side and the gas discharge port side of the valve hole in the pressure fluctuation removing means of the gas flow path becomes large, and the gas A valve body for closing the valve hole when the differential pressure between the downstream side and the gas discharge port side of the valve hole in the pressure fluctuation removing means in the flow path is small, and a diaphragm coaxially connected to the valve body; , Diaphragm, diaphragm chamber A first space communicating with the gas outlet side of the gas flow path, a second communicating the gas supply port side of the gas passage
The valve is opened and closed by a displacement of a diaphragm caused by a differential pressure between the first and second spaces, and the valve and the diaphragm are horizontally operated with respect to a predetermined arrangement state of the gas meter main body. And a mounting direction of the gas meter body is not limited to a rotation direction about a horizontal axis. According to the present invention, the gas flow path of the gas meter body is provided with the pressure fluctuation removing means and the measuring means along the gas passing direction. The pressure fluctuation removing means is:
The valve body and the diaphragm are displaced in the horizontal direction by a differential pressure between the pressure on the downstream side of the valve hole in the pressure fluctuation removing means and the pressure on the gas outlet side. It is possible to reduce the differential pressure for causing the structural displacement, reduce the weight of the valve body, reduce the pressure receiving area of the diaphragm, reduce the diameter of the diaphragm, and reduce the configuration. it can.

According to a second aspect of the present invention, in the configuration of the first aspect, the pressure fluctuation removing means communicates with a gas flow path, and accommodates a valve chamber in which the valve element is accommodated and the diaphragm. A diaphragm that partitions the valve chamber and the diaphragm chamber and that has a through hole that limits the operation speed of the diaphragm. According to the present invention, a through-hole realized by, for example, a sufficiently small through-hole with respect to the pressure-receiving surface of the diaphragm is formed in the partition partitioning the diaphragm chamber and the valve chamber, so that the diaphragm chamber communicating with the through-hole is formed. A small amount of gas flowing into or out of one of the spaces partitioned by the diaphragm can be allowed, thereby restricting the operation speed of the diaphragm,
The disadvantage that the valve body is displaced by the pressure fluctuation and adversely affects the weighing operation can be prevented, and accurate weighing can be performed.

According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the diaphragm is magnetically attached to the partition by magnetic attraction means having a permanent magnet piece disposed in the first space. It is characterized by being sucked. According to the present invention, since the diaphragm is configured to be magnetically attracted to the partition wall by the magnetic attraction means, it is possible to prevent a problem that the valve body is displaced by pressure fluctuation and adversely affect the weighing operation, and the flow rate can be accurately determined. Can be measured.
The magnetic attraction means is disposed in the first space and has a permanent magnet piece. The amount of gas flowing into the first space is small, so that dust such as iron powder contained in the gas is prevented from adhering to the permanent magnet pieces, thereby possibly causing malfunction such as malfunction. The reliability can be improved by reducing the number of times.

According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects of the present invention, the pressure fluctuation removing means includes a gas passage downstream of the valve chamber and the pressure fluctuation removing means. A large flow meter gas outflow hole communicating with the large flow meter gas outflow hole, a small flow meter gas outflow hole having a smaller diameter than the large flow meter gas outflow hole and provided at a different position in the circumferential direction are formed. It has a cylindrical body in which the diaphragm is stored. According to the present invention, the pressure fluctuation removing means has a cylinder in which the gas outlet for the large flow meter and the gas outlet for the small flow meter are formed at different positions in the circumferential direction. When mounted on the main body, the gas flow hole is installed in the gas flow hole for the large flow meter or the gas flow hole for the small flow meter at a different position in the circumferential direction, so that the gas flow path has a flow path resistance corresponding to the number of meters. By giving a pressure such that the valve element is fully opened at the maximum flow rate, measurement can be performed by selectively switching two meter numbers with one fluidic gas meter.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the valve body and the diaphragm are coaxially connected by a connecting shaft, and the partition wall is provided with the connecting shaft. Is displaceably inserted along its axis,
The valve body is tiltably locked to one end of the connection shaft on the valve chamber side by locking means. According to the present invention, the valve body and the diaphragm are coaxially connected by the connection shaft, and the valve body is locked by the locking means so as to be tiltable with respect to the connection shaft. Since the valve body is tiltable in this manner, it can be stably seated, the gap when the valve body comes into contact with the valve seat is reduced, and the gas sealing performance can be stably maintained.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, the partition wall projects into the valve chamber,
An annular contact piece surrounding the connecting shaft and preventing displacement of the valve body in the valve opening direction is formed. According to the present invention, the valve body is stably supported in the fully opened state by the annular contact piece formed on the partition wall, and an undesired change in the flow path cross-sectional area due to the inclination of the valve body is prevented, An increase in pressure loss and an adverse effect on detection accuracy due to body displacement can be prevented.

According to a seventh aspect of the present invention, in addition to the configuration of the fourth aspect of the present invention, the cylinder is provided in the gas meter main body.
Either the gas flow hole for the large flow meter or the gas flow hole for the small flow meter is selectively rotatably mounted at a rotation position communicating with the gas flow path downstream of the pressure fluctuation removing means. It is characterized by. According to the present invention, one of the large flow meter gas outflow hole and the small flow meter gas outflow hole communicates with the gas flow path on the downstream side of the pressure fluctuation removing means with respect to the gas meter body. Since it is selectively rotatably mounted at the rotation position, the cylinder is rotated to use one of the large flow meter gas outflow hole and the small flow meter gas outflow hole. The operation for changing the number is easy, the convenience is improved, and the number of components can be measured with one gas meter as two meters. Therefore, the number of parts can be reduced and the manufacturing cost can be reduced. .

[0020]

FIG. 1 is a sectional view of a fluidic gas meter 31 according to an embodiment of the present invention as viewed from the rear side, and FIG. 2 is a front view of the fluidic gas meter 31. 3 is a side view seen from the right side of FIG. The fluidic gas meter 31 has a gas supply port 3
2, a gas meter main body 35 having a gas flow port 34 communicating with the gas supply port 32 and the gas discharge port 33, the gas meter main body 35 having a gas flow port 34,
A measuring means 36 for measuring a gas flow rate based on an alternating pressure change generated by the passage of the gas; and a gas flow path 34 which is interposed in the gas flow passage 34 on the upstream side of the measuring means 36 in the gas passage direction and transmitted from an upstream pipe. Between the pressure fluctuation removing means 37 for absorbing the pressure fluctuation and the measuring means 36 and the pressure fluctuation removing means 37 in the gas flow path 34, for example, an earthquake detected by the seismic sensor 40, an excessive flow rate, an excessive flow rate, a temperature rise, etc. And a battery 39 for supplying drive power to the shut-off valve 38 and various sensors to be described later.

The pressure fluctuation removing means 37 opens the valve hole 41 when the pressure difference between the pressure P1 on the gas supply port 32 side of the gas flow path 34 and the pressure P3 on the gas discharge port 33 side increases.
And a valve element 42 for closing the valve hole 41 when the pressure difference between the pressure P1 on the gas supply port 32 side and the pressure P3 on the gas discharge port 33 side of the gas flow path 34 is reduced. And a diaphragm 43 connected to the diaphragm 43. The diaphragm 43 causes the diaphragm chamber 44 to be in the gas flow path 3.
4, a first space 45 communicating with the gas discharge port 33 side and a second space 46 communicating with the gas supply port 32 side of the gas flow path 34, and the pressure P1 in the second space 46, Space 4
The valve body 42 is opened and closed by the displacement of the diaphragm 43 due to the pressure difference (P1-P3) from the pressure P3 in the valve 5. From a valve chamber 67 to be described later, a passage 58, a valve chamber 59, a valve hole 6
0, and the gas that has passed through the passage 61 becomes the pressure P2 in the passage 62, and the pressure P3 in the first space 45 is equal to the pressure on the gas discharge port 33 side after passing through the fluidic element 50 described later. At the same pressure.

The valve body 42 and the diaphragm 43
The operation direction is horizontal with respect to the predetermined arrangement state of the gas meter main body 35, that is, the arrangement state in which the upper part 47 is vertically upward and the lower part 48 is vertically downward and the gas supply port 32 and the gas discharge port 33 face downward. It is provided so that The first space 45 is provided with the pressure introduction passage 4 in the gas outlet 33.
9 and thus the gas outlet 33 and the first space 45 are at the same pressure. On the front side of the gas meter main body 35 shown in FIG. 2, a vibration detection sensor 51 for detecting a change in the alternating pressure generated by the fluidic element 50 is provided, and includes the fluidic element 50 and the vibration detection sensor 51. This constitutes the measuring means 36.
Although this measuring means 36 can measure a flow rate of 150 liters / hour or more,
Since a small flow rate less than the hour cannot be detected, a flow sensor 52 capable of measuring a flow rate in a range of 3 to 150 liter / hour is provided above the fluidic element 50.
Is provided. A pressure sensor 53 for detecting a pressure drop inside the meter is provided below the fluidic element 50.
Is provided.

The gas meter body 35 has a gas supply port 32
Storage space 57, passage 58, valve body 6 of shut-off valve 38 in which pressure fluctuation removing means 37 is fitted and stored in close proximity to
The valve chamber 59, the valve hole 60, the passage 61, and the passage 6 in which
The second storage space 63 in which the second and fluidic elements 50 are stored is formed in this order, and forms the gas flow path 34.

FIG. 4 is an enlarged sectional view of the pressure fluctuation removing means 37, FIG. 5 is a side view showing the appearance of the pressure fluctuation removing means 37, and FIG. FIG. 7 is a bottom view of the pressure fluctuation removing unit 37 viewed from below in FIG. The pressure fluctuation removing means 37 is provided in the passage 58 which forms a part of the gas flow path 34.
And a partition 68 that partitions a valve chamber 67 in which the valve element 42 is stored and a diaphragm chamber 44 in which the diaphragm 43 is stored.
7 and the diaphragm chamber 44 are communicated with each other, and a through hole 69 for limiting the operation speed of the diaphragm 43 is formed. The valve body 42 and the diaphragm 43 are coaxially connected by a connecting shaft 70, and a sleeve 71 through which the connecting shaft 70 is displaceably inserted along the axis is integrally formed on the partition wall 68. In the sleeve 71, a straight cylindrical bearing 72 made of a metal or a synthetic resin having a good sliding property is housed, and holds the connecting shaft 70 movably in the axial direction in a nearly airtight state.

An annular spacer 73 made of a non-magnetic material is provided at one end of the sleeve 71 protruding toward the second space 46.
An annular suction piece 74 made of a ferromagnetic material is fitted. The central portion of the diaphragm 43 is provided with two circular holding plates 75.
a, 75b, these holding plates 75a,
A small-diameter shaft portion 76 formed at a first end disposed on the second space 46 side of the connection shaft 70 is inserted through the diaphragm 75 b and the diaphragm 43. An annular permanent magnet piece 77 is mounted on the small-diameter shaft portion 76 protruding from the holding plate 75a disposed on the first space 45 side of the holding plates 75a and 75b.
A cover 78 made of, for example, a non-magnetic material is fitted to the permanent magnet piece 77, and the permanent magnet piece 77 is retained in a state in which the permanent magnet piece 77 is prevented from being removed by a retaining ring 79 attached to the distal end of the small diameter shaft portion 76. It is installed without being exposed to the outside. These spacer 73, suction piece 74, connecting shaft 70
Small diameter shaft portion 76, cover body 78 and retaining ring 79
Are included in the magnetic attraction means 81. With such a magnetic attraction means 81, even when the valve element 42 tries to open due to pressure fluctuation due to disturbance or the like while the valve element 42 is seated on the valve seat 82 surrounding the valve hole 41, the valve element 42 is seated on the valve seat 82. The state can be maintained, whereby the pressure fluctuation can be attenuated, and the accuracy of measurement by the measuring means 36 is prevented from lowering.

The peripheral edge of the diaphragm 43 is
Is airtightly fitted and held on a peripheral wall 84 of a first holding member 83 having a bottom as a bottom. The peripheral wall 84 has a large-diameter portion 85a into which the peripheral portion of the diaphragm 43 fits, and a small-diameter portion 85b coaxially connected to the large-diameter portion 85a and integrally forming the partition wall 68. One end in the axial direction of the substantially cylindrical second holding body 86 fits on the outer peripheral surface of the small diameter portion 85b. The second cylindrical body 86 has a large flow meter gas outlet hole 87 that communicates with the valve chamber 67 and a passage 58 that is a gas passage downstream of the pressure fluctuation removing unit 37 in the gas passage direction. A small flow meter gas outlet hole 88 which is smaller in diameter than the flow meter gas outlet hole 87 and provided at a 180 ° position in the circumferential direction is formed. The first
A cylindrical body 89 is constituted by the holding body 83 and the second holding body 86.

Near the other end in the axial direction of the second holding body 86, two radial holes 90, 9 are formed at 180 ° positions in the circumferential direction.
1 are formed, and each of the diameter holes 90 and 91 and each of the gas outflow holes 8 are formed.
An annular groove 93 into which the O-ring 92 fits is formed between the first groove 7 and the second groove 88. The O-ring 92 elastically abuts the inner peripheral surface defining the first storage space 57 over the entire circumference in a state where the pressure fluctuation removing means 37 is mounted in the first storage space 57 of the gas meter main body 35. In addition, gas leakage can be prevented by achieving airtightness.

The partition wall 68 also has an annular, substantially right cylindrical shape that surrounds a part of the connecting shaft 70, a part of the sleeve 71, and a part of the bearing 72, which protrude into the valve chamber 67. The contact piece 96 is formed integrally. The outer shape of the contact piece 96 is selected to be about 約 of the outer shape of the valve element 42, and the valve element 42 in the fully opened state can be stably supported on the valve chamber 67 side. At the end of such a contact piece 96, a notch 97 is formed in which a part in the circumferential direction is cut. Even when the valve element 42 is in contact with and supported by the contact piece 96 in the fully opened state by the notch 97, the valve chamber 67 and the contact piece 96
The internal space surrounded by the valve chamber 67
And the second space 46 can be communicated through the through hole 69.

At the other end in the axial direction, which is arranged on the valve chamber 67 side of the connecting shaft 70, a locking means 101 for locking the valve body 42 in a tiltable manner is provided. The locking means 101 includes a small-diameter shaft portion 102 formed coaxially and integrally with the other end of the connecting shaft 70, and an O-shape fitted at the base of the small-diameter shaft portion 102.
A ring 103 and a snap fit 10 for fitting the valve body 42 to a tip end of the small diameter shaft portion 102 protruding from the valve body 42.
And 4.

By such a locking means 101, the valve body 42 is attached to the connecting shaft 70 which is a valve shaft with flexibility without being fixed, and a gap when the valve body 42 is seated on the valve seat 82 is formed. It can be eliminated or reduced, and the seat can be stably seated. If there is a gap in spite of the fact that the valve element 42 is seated on the valve seat 82, the pressure fluctuation generated on the gas supply port 32 side of the valve element 42 is measured by the measuring means 36.
This is to prevent erroneous detection of the gas flow rate due to such erroneous detection.

FIG. 8 is a sectional view showing the operation of the pressure fluctuation removing means 37. FIG. 8A shows a state in which the valve body 42 is seated on the valve seat 82, and FIG. 8 shows a state in which gas flows through the large flow meter gas outflow hole 87 in the fully opened state, and FIG.
Shows a state in which the gas flows through. FIG. 9 shows the state shown in FIG.
9 is a graph showing the relationship between the flow rate and the pressure loss when passing through the large flow rate gas outflow hole 87 shown in FIG. 8 and when passing through the small flow rate gas outflow hole 88 shown in FIG.

First, as shown in FIG. 8 (1), when the pressure fluctuation removing means 37 is mounted on the gas meter main body 35 with the large flow meter gas outlet hole 87 communicating with the passage 58, the line L1 is used. As shown, the gas flow path 34 maintains the meter pressure loss by the valve element 42, and as the flow rate increases, the pressure loss P1-P3 between the first and second spaces 45, 46 increases, and accordingly, the valve element 42 opens and the meter pressure drop ΔP decreases. Eventually FIG.
As shown in (2), when the valve element 42 is fully opened so that the flow rate Q is indicated by reference numeral B, the pressure loss Δ
P decreases most, and in this state, as the flow rate Q further increases, the pressure loss ΔP of the meter increases.

In response to the change in the differential pressure acting on the diaphragm 43 shown by the line L2, the line L1
, The pressure loss ΔP of the meter changes.
By the action of the differential pressure on the diaphragm 43,
The valve body 42 is gradually opened, and the flow rate can be increased below the pressure loss allowed at the maximum flow rate, and a pressure loss can be generated in a flow rate range susceptible to pressure fluctuation. Further, when the gas outlet hole 88 for a small flow meter is used as shown in FIG. 8 (3), the valve body 42 is arranged such that the flow rate Q is indicated by a reference symbol C as indicated by a line L3. Is fully opened, the pressure loss ΔP decreases most,
If the flow rate Q further increases in this state, the pressure loss ΔP increases. In response to the change with the differential pressure acting on the diaphragm 43 shown by the line L4, the pressure loss ΔP of the meter changes as shown by the line L3. Diaphragm 4
The valve body 42 is gradually opened by the differential pressure P1-P3 acting on the valve 3, and the flow rate can be increased at the maximum flow rate without a pressure loss exceeding the standard.

With the above configuration, the gas flow rate of the gas meter body 35 is provided with the pressure fluctuation removing means 37 and the measuring means 36 along the gas passing direction. The pressure fluctuation removing means 37 is configured such that the valve body 42 and the diaphragm 43 are connected to the gas supply port 32 side pressure P1 and the gas discharge port 33 side pressure P1.
3 can be displaced in the horizontal direction due to the differential pressure with respect to 3, the differential pressure for causing the structural displacement can be reduced, and the weight of the valve body 42 is reduced, so that the pressure receiving area of the diaphragm 43 is reduced. Thus, the diameter of the diaphragm 43 can be reduced, and the configuration can be downsized.

Further, a through-hole realized by, for example, a sufficiently small through-hole with respect to the pressure-receiving surface of the diaphragm 43 is formed in the partition wall 68 which separates the diaphragm chamber 44 and the valve chamber 67, and communicates with this through-hole. Diaphragm room 4
The passage of a small amount of gas flowing into or out of one of the spaces partitioned by the diaphragm 43 in the diaphragm 4 can be permitted, whereby the operating speed of the diaphragm 43 is limited, and the valve body 42 is displaced by pressure fluctuation. Inconvenience of adversely affecting the weighing operation can be prevented, and more accurate weighing can be performed.

Further, since the diaphragm 43 is magnetically attracted to the partition wall 68 by the magnetic attraction means 81, the valve body 42 is displaced by the pressure fluctuation, and the weighing means erroneously detects the displacement of the valve body 42. The inconvenience described above can be prevented, and the flow rate can be accurately measured. The magnetic attraction means 81 has a permanent magnet piece disposed in the first space. The amount of gas flowing into this first space is small,
This prevents dust such as iron powder contained in the gas from adhering to the permanent magnet pieces, thereby minimizing the occurrence of malfunctions such as malfunctions and improving reliability. it can.

The pressure fluctuation removing means 37 has a cylindrical body in which the gas outlet for the large flow meter and the gas outlet for the small flow meter are formed at different positions in the circumferential direction. By mounting the gas flow hole at a different position in the circumferential direction to one of the gas flow hole for the large flow meter and the gas flow hole for the small flow meter when mounting it on the 35, the flow resistance according to the number of the meter in the gas flow path is increased. Thus, a pressure for operating the valve element 42 at the maximum flow rate is generated, and the measurement can be performed by selectively switching two meter numbers with one fluidic gas meter.

The valve 42 and the diaphragm 43 are coaxially connected by a connecting shaft, and the valve 42 is locked by a locking means so as to be tiltable with respect to the connecting shaft. Since the valve body 42 is tiltable in this manner, the gap when the valve body 42 comes into contact with the valve seat is reduced, the seat can be stably seated, and the gas sealing property can be stably maintained. .

Further, the valve body 42 is stably supported in the fully opened state by the annular contact piece formed on the partition wall 68, thereby preventing an undesired change in the cross-sectional area of the flow path due to the inclination of the valve body 42. An increase in pressure loss due to the displacement of the valve body 42 and an adverse effect on detection accuracy can be prevented.

In the cylinder, one of the gas flow hole for the large flow meter and the gas flow hole for the small flow meter communicates with the gas flow path on the downstream side of the pressure fluctuation removing means 37 with respect to the gas meter body 35. Since the cylinder is selectively rotatably mounted at the pivot position, the cylinder is pivoted to use one of the gas outlet for the large flow meter and the gas outlet for the small flow meter so that the number of the meter can be increased. Is easy, the convenience is improved, and the number of components can be measured with one gas meter as two meters. Therefore, the number of parts can be reduced, and the manufacturing cost can be reduced.

[0041]

According to the first aspect of the present invention, the gas flow path of the gas meter body is provided with the pressure fluctuation removing means and the measuring means along the gas passage direction. In the pressure fluctuation removing means, the valve body and the diaphragm are displaced in the horizontal direction by a differential pressure between a pressure downstream of the valve hole in the pressure fluctuation removing means and a pressure on the gas discharge port side. It is possible to reduce the differential pressure for causing the structural displacement, reduce the weight of the valve body, reduce the pressure receiving area of the diaphragm, reduce the diameter of the diaphragm, and reduce the configuration. it can.

According to the second aspect of the present invention, a through-hole realized by a sufficiently small through-hole with respect to the pressure-receiving surface of the diaphragm is formed in the partition partitioning the diaphragm chamber and the valve chamber. The passage of a small amount of gas flowing into or out of one of the spaces partitioned by the diaphragm in the diaphragm chamber communicating with the through hole can be allowed to pass, whereby the operating speed of the diaphragm is limited and the valve body is subjected to pressure fluctuation. As a result, the inconvenience of being displaced and adversely affecting the weighing operation can be prevented, and accurate weighing can be performed.

According to the third aspect of the present invention, the diaphragm is magnetically attracted to the partition wall by the magnetic attraction means.
The inconvenience of adversely affecting the weighing operation is prevented, and the flow rate can be accurately measured. The magnetic attraction means has a permanent magnet piece disposed in the first space. The amount of gas flowing into the first space is small, so that dust such as iron powder contained in the gas is prevented from adhering to the permanent magnet pieces, thereby possibly causing malfunction such as malfunction. The reliability can be improved by reducing the number of times.

According to the fourth aspect of the present invention, the pressure fluctuation removing means includes a cylindrical body in which the gas outlet for the large flow meter and the gas outlet for the small flow meter are formed at different positions in the circumferential direction. Therefore, when this cylinder is mounted on the gas meter main body, it is attached to one of the gas flow hole for the large flow meter and the gas flow hole for the small flow meter at a different position in the circumferential direction, so that the By giving the flow path resistance according to the number and generating the pressure so that the valve body is fully opened at the maximum flow rate, it is possible to selectively switch two meter numbers with one fluidic gas meter and measure. Becomes

According to the fifth aspect of the present invention, the valve body and the diaphragm are coaxially connected by the connecting shaft, and the valve body is locked by the locking means so as to be tiltable with respect to the connecting shaft. Since the valve body is tiltable in this manner, the gap when the valve body comes into contact with the valve seat is reduced, the seat can be stably seated, and the gas sealing property can be stably maintained.

According to the sixth aspect of the present invention, the valve body is stably supported in the fully opened state by the annular abutting piece formed on the partition, and the undesired cross-sectional area of the flow path due to the inclination of the valve body is reduced. Such a change can be prevented, and an increase in pressure loss due to the displacement of the valve body and an adverse effect on detection accuracy can be prevented.

According to the seventh aspect of the present invention, in the cylinder, one of the gas outlet for the large flow meter and the gas outlet for the small flow meter is located downstream of the pressure fluctuation removing means with respect to the gas meter body. Side so as to be selectively rotatably mounted at a rotation position communicating with the gas flow path, so that the cylinder is rotated so that one of the gas flow hole for the large flow meter and the gas flow hole for the small flow meter is rotated. By using one of them, the operation for changing the number of meters is easy, the convenience is improved, and the number of meters can be measured with one gas meter. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a rear view showing a fluidic gas meter according to an embodiment of the present invention as viewed from the rear side.

FIG. 2 is a front view of a fluidic gas meter 31.

FIG. 3 is a cross-sectional view of the fluidic gas meter 31 as viewed from the right side of FIG.

FIG. 4 is an enlarged sectional view of a pressure fluctuation removing unit 37.

FIG. 5 is a front view showing the appearance of the pressure fluctuation removing means 37.

FIG. 6 is a plan view of the pressure fluctuation removing unit 37 viewed from above in FIG. 5;

FIG. 7 is a bottom view of the pressure fluctuation removing unit 37 as viewed from below in FIG. 5;

FIG. 8 is a cross-sectional view for explaining the operation of the pressure fluctuation removing means 37. FIG. 8A shows a state in which the gas outlet hole 87 for the large flow meter is communicated with the passage 58, and the valve body 42 is a valve seat. 82
8 (2) shows a state in which the valve body 42 is fully opened using the large flow meter gas outlet hole 87, and FIG. 8 (3) shows a small flow meter gas outlet hole 88. Shows a state where the valve element 42 is fully opened.

FIG. 9 is a graph showing a relationship between a flow rate and a pressure loss of a fluidic gas meter 31 equipped with a pressure fluctuation removing unit 37.

FIG. 10 is a simplified cross-sectional view of a typical prior art fluidic gas meter 1 as viewed from the front side.

[Explanation of symbols]

 31 Fluidic gas meter 32 Gas supply port 33 Gas outlet 34 Gas flow path 35 Gas meter main body 36 Metering means 37 Pressure fluctuation removing means 37 Shut off valve 43 Diaphragm 44 Diaphragm chamber 45 First space 46 Second space 49 Pressure introduction passage 50 Fluy Dick element 67 Valve chamber 68 Partition wall 69 Through hole 70 Connecting shaft 77 Permanent magnet piece 81 Magnetic attraction means 82 Valve seat 87 Gas flow hole for large flow meter 88 Gas flow hole for small flow meter 101 Locking means

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 000156813 Kansai Gas Meter Co., Ltd. 2- 10-16 Higashi Kobashi, Higashinari-ku, Osaka City, Osaka (71) Applicant 000142425 Kinmon Manufacturing Co., Ltd. 1-2-2 Shimura, Itabashi-ku, Tokyo No. 3 (71) Applicant 000150109 Takenaka Manufacturing Co., Ltd. 1-151 Nakagawa Nishi, Ikuno-ku, Osaka-shi, Osaka (71) Applicant 000222211 Toyo Gas Meter Co., Ltd. 2975 Motoe, Shinminato-shi, Toyama Prefecture (72) Inventor Atsui Ikko 9-10 Misonodai, Fujisawa-shi, Kanagawa (72) Inventor Katsuto Sakai 4-4-11 Shichidaidai, Shirai-cho, Inba-gun, Chiba (72) Inventor Shuichi Okada Hiranocho, Chuo-ku, Osaka-shi, Osaka 1-2, Osaka Gas Co., Ltd. (72) Inventor Makoto Okabayashi 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Osaka Gas Co., Ltd. (72) Inventor Sa Takato Fuji 507-2 Shinhocho-cho, Tokai City, Aichi Prefecture Toho Gas Co., Ltd. (72) Inventor Shinji Shinji Tomoe 1-chome 2-70, Atsuta-ku, Nagoya City, Aichi Prefecture Aichi Watch Electronics Co., Ltd. (72) Inventor Masanobu Namimoto 2-10-16 Higashiobashi, Higashinari-ku, Osaka-shi, Osaka Inside Kansai Gas Meter Co., Ltd. (72) Inventor Toshiaki Aoki 1-2-3 Shimura, Itabashi-ku, Tokyo Inside Kinmon Manufacturing Co., Ltd. (72 Inventor Masanari Imazaki 4-7-131 Nishiiwata, Higashiosaka City, Osaka Prefecture Inside Kansai Research Laboratory, Kinmon Manufacturing Co., Ltd. (72) Inventor Masahiro Noto 5-35-9 Futawahigashi, Funabashi City, Chiba Prefecture (72) Inventor Fujio Hori 2975 Motoe, Shintominato-shi, Toyama Toyo Gas Meter Co., Ltd. (72) Inventor Kazuhiro Yoshino 2975 Motoe, Motoe, Shinminato-shi, Toyama Toyo Gas Meter Co., Ltd.

Claims (7)

[Claims] 1. A gas meter body in which a gas flow path communicating between a gas supply port and a gas discharge port is formed, and a gas flow rate is measured based on an alternating pressure change generated by passage of the gas and interposed in the gas flow path. And a pressure fluctuation removing means interposed in the gas flow path upstream of the measuring means in the gas passage direction and absorbing a pressure fluctuation at a gas supply port. The valve hole is opened when the differential pressure between the downstream side and the gas discharge port side of the valve in the pressure fluctuation removing means of the passage is increased, and the valve is opened more than the valve hole in the pressure fluctuation removing means of the gas flow path. It has a valve body that closes a valve hole when the differential pressure between the downstream side and the gas discharge port side is small, and a diaphragm that is coaxially connected to the valve body. The first communicating with the exit side And a second space communicating with the gas supply port side of the gas flow path, the valve body is opened and closed by the displacement of the diaphragm due to the pressure difference between the first and second spaces, and the valve body and the diaphragm are A fluidic gas meter provided such that the operating direction is horizontal with respect to a predetermined arrangement state of the gas meter main body, and the mounting posture of the gas meter main body is not limited to a rotation direction about a horizontal axis. 2. The pressure fluctuation removing means has a partition wall which communicates with a gas flow path and separates a valve chamber in which the valve element is stored and a diaphragm chamber in which the diaphragm is stored. 2. The fluidic gas meter according to claim 1, wherein a through hole is formed to communicate the valve chamber with the diaphragm chamber and to limit an operation speed of the diaphragm. 3. The fluidic gas meter according to claim 1, wherein the diaphragm is magnetically attracted to the partition wall by magnetic attraction means having a permanent magnet piece disposed in the first space. 4. A gas flow outlet for a large flow meter communicating with the valve chamber and a gas flow path downstream of the pressure fluctuation remover, and a diameter smaller than the gas outlet for a large flow meter. And a gas outlet hole for a small flow meter provided at a different position in the circumferential direction, and a cylindrical body in which the valve body and the diaphragm are housed. Fluidic gas meter as described. 5. The valve body and the diaphragm are coaxially connected by a connecting shaft, and the connecting shaft is inserted into the partition wall so as to be displaceable along its axis, and is connected to one end of the connecting shaft on the valve chamber side. The fluidic gas meter according to any one of claims 1 to 4, wherein the valve body is tiltably locked by locking means. 6. The partition wall is formed with an annular contact piece projecting into the valve chamber, surrounding the connecting shaft and preventing displacement of the valve body in the valve opening direction. 6. The fluidic gas meter according to 5. 7. The gas cylinder according to claim 1, wherein one of the large flow meter gas outlet and the small flow meter gas outlet communicates with the gas flow path downstream of the pressure fluctuation removing means. 5. The fluidic gas meter according to claim 4, wherein the fluidic gas meter is selectively rotatably mounted at the moving position.