JP2001281026A - Fluidic type gas meter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mass production by simplifying constitution. SOLUTION: A pressure change removing means 37 and a fluidic flowmeter 36 are sequentially provided in this order along a gas passing direction at the gas cannel of a gas meter body 35. A valve disc 2, which can be seated at a valve seat 82, is coupled to a diaphragm 43 via a valve stem 70. The diaphragm 43 approaches the disc 42 to a valve seat 48 as a pressure difference between the pressure on the upstream side from a valve hole 41 and the pressure of a gas exhaust port side is reduced. A pressure inlet passage for communicating with the downstream side of the flowmeter through the second space is provided at the body part of the gas meter body. An annular engaging protrusion 103 of a peripheral edge 101 of the diaphragm is made to contact elastically airtightly with a contact part 114 counterposed to a housing hole 113, by inserting a holder 107 of the means 37 into the hole 113 of the meter body 35.

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.

[0002]

2. Description of the Related Art Fluidic gas meters have a fluidic flow meter.
It includes a fluidic element that generates an alternating pressure change by passing gas, and a flow meter that detects the frequency of an alternating pressure wave of fluidic oscillation due to the alternating pressure change and calculates a gas flow rate from this frequency. When the supplied gas contains noise of pressure fluctuation, especially at a small flow rate, it adversely affects the fluidic oscillation of the fluidic element, and when the pressure fluctuation approximates the frequency of the fluidic oscillation, the correct gas flow rate is obtained. Measurement becomes impossible. In order to solve this problem, a pressure fluctuation removing means is arranged upstream of the fluidic flow meter in the gas flow over-direction to increase the flow path resistance at a small flow rate, and the gas pressure fluctuation noise reduces the fluid flow rate. To be transmitted to the meter.

The pressure fluctuation removing means has a valve element driven by a diaphragm, and obtains a flow path resistance by a gap between the valve element and a valve seat. On one surface of the diaphragm,
The pressure of the gas downstream of the valve acts, the pressure of the gas downstream of the fluidic flow meter acts on the other surface of the diaphragm, and the diaphragm is displaced by the differential pressure acting on both sides of the diaphragm. Then, the valve body is driven.

[0004] Both sides of the diaphragm must be configured so that each gas pressure acts accurately, otherwise the opening between the valve body and the valve seat must be properly achieved by the differential pressure. Therefore, the function of absorbing the external gas pressure fluctuation by the pressure fluctuation removing means becomes insufficient.

Further, since a plurality of fluidic gas meters are used, the number of parts is reduced as much as possible.
It is desired that the configuration be simplified and manufacturing be easy.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to operate a pressure fluctuation removing means smoothly, to generate an appropriate pressure loss in a gas supplied to a fluidic flow meter, and to reduce a pressure fluctuation of the supplied gas. Preventing the fluidic flowmeter from adverse effects due to noise, enabling accurate measurement, enabling accurate operation of the pressure fluctuation removing means, and simplifying the configuration to achieve mass production An object of the present invention is to provide a fluidic gas meter that can be easily manufactured.

[0007]

According to the present invention, there is provided a gas meter main body having a gas flow path communicating with a gas supply port and a gas discharge port, and (b) a gas meter body interposed in the gas flow path,
A fluidic flow meter that measures the gas flow rate based on an alternating pressure change generated by the passage of gas; and (c) a gas flow path that is interposed upstream of the fluidic flow meter in the gas passage direction and absorbs pressure fluctuations. (C1) a holding member having a valve seat communicating with the gas supply port and having a horizontally extending valve hole facing the downstream side in the gas passage direction; and (c2) proximate to the valve seat. A valve body that separates and displaces;
3) magnetic attraction force generating means for generating a magnetic attraction force in a direction in which the valve element approaches the valve seat at a small flow rate by the valve element and the valve seat;
(C4) The diaphragm chamber is connected to the valve body and partitions the diaphragm chamber into a first space communicating with the gas supply port of the gas flow path and a second space communicating with the gas discharge port side of the gas flow path. 2
The valve body is opened and closed by a force that pushes the diaphragm due to the differential pressure in the space, a force that pushes the valve body due to the differential pressure across the valve body, and a magnetic attraction force that is given by the magnetic attraction force generating unit,
A pressure fluctuation removing means having a diaphragm for largely separating the valve body from the valve seat as the flow rate approaches the maximum flow rate.
13, is housed so as to be able to be inserted and removed along the axial direction of the holder, and a step-shaped contact portion 114 is formed on the inner peripheral surface of the housing hole 113 facing the opening side of the housing hole. The peripheral portion 101 faces the downstream side in the insertion direction 116 of the holder, and this peripheral portion is a fluidic gas meter characterized by elastically and airtightly contacting the contact portion 114.

According to the present invention, in the gas flow path of the gas meter body, the pressure fluctuation removing means and the fluidic flow meter are arranged in this order along the gas passing direction. The valve body is driven in a horizontal direction, for example, in a horizontal direction by a diaphragm to open and close a laterally extending valve hole formed in the valve hole. As the differential pressure increases, the valve element is separated from the valve seat. Conversely, when the differential pressure is small and the flow rate is small, the valve element approaches or sits on the valve seat and the pressure loss increases. .

At a small flow rate of the gas, an increase in pressure loss caused by the pressure fluctuation removing means prevents adverse effects on the fluidic oscillation of the fluidic element due to the pressure fluctuation noise of the gas whose flow rate is to be measured. .

[0010] In particular, according to the present invention, the holder 107 of the pressure fluctuation removing means can be inserted and mounted in the accommodating hole of the gas meter body, and the peripheral portion of the diaphragm provided in the pressure fluctuation removing means. When the holder is inserted into the storage hole, the spring 101 resiliently comes into contact with the step-shaped contact portion 114 formed on the inner peripheral surface of the storage hole. Thereby, the second space 46 is formed.
Becomes airtight, and the pressure on the gas outlet side of the gas flow path downstream of the fluidic flow meter can be accurately transmitted to the second space. Thus, the function of absorbing the gas pressure fluctuation from the outside of the pressure fluctuation removing means can be reliably achieved.

Further, the present invention is characterized in that an end plate 119 is attached to an end face 117 of the gas meter body where the opening of the storage hole faces to close the storage hole, and the peripheral edge of the diaphragm is pressed against the contact portion by this end plate. And

According to the present invention, the pressure fluctuation removing means is inserted into the storage hole formed in the gas meter main body as described above, and the end plate 119 is attached to the end face 117 of the gas meter main body. The unit 101 is
The airtightness is achieved by being pressed against the contact portion 114. Thus, the assembling work is facilitated.

Further, according to the present invention, the diaphragm has a mounting portion 122 mounted on the valve body, and a bulging portion 253 bulging into the second space 46 surrounding the mounting portion 122 radially inward of the peripheral edge portion 110. The holding member 107 has an annular fitting groove 123 formed on the downstream side in the insertion direction, and the peripheral edge portion 110 is provided with the annular fitting protrusion 1 fitted in the fitting groove 123.
02, and the seal portion 103 protruding downstream in the insertion direction and abutting on the contact portion 114.

According to the present invention, the diaphragm mounting portion 122 (see FIG. 7 described later) is attached to the valve body, for example, the valve stem 7.
0, and an annular bulging portion 253 is formed radially outward of the mounting portion.
Protrudes into the second space 46 and bulges radially outward from the bulge portion.
Are formed to project downstream in the insertion direction of the pressure fluctuation removing means into the storage hole, that is, forward in the insertion direction (to the left in FIG. 3), and the seal portion 103 is formed by the contact portion 114 of the storage hole.
And the airtightness is achieved. An annular fitting projection 102 is formed on the peripheral edge portion 101 of the diaphragm so as to protrude upstream in the insertion direction, that is, backward in the insertion direction.
The annular fitting protrusion is formed on the holding body 107 and is located on the downstream side in the insertion direction, that is, the annular fitting groove 1 facing forward in the insertion direction.
23. Therefore, with the diaphragm attached to the holder, the holder can be inserted into the storage hole of the holder and assembled. As a result, the assembling work is facilitated, and the productivity is further improved.

Further, according to the present invention, the holding member is formed with annular sealing pieces 125, 125a protruding outward in the vicinity of the valve seat in the gas flow direction of the gas flow path. It is characterized in that it resiliently and airtightly contacts the inner peripheral surface of 113.

Further, the present invention provides (a) a gas meter body in which a gas flow path communicating with a gas supply port and a gas discharge port is formed, and (b) an alternating gas generated by passage of a gas, interposed in the gas flow path. A fluid flow meter for measuring a gas flow rate based on a pressure change; and (c) a pressure fluctuation removing means interposed in the gas flow path upstream of the fluid flow meter in the gas passage direction to absorb the pressure fluctuation. hand,
(C1) a holder having a valve seat that communicates with the gas supply port and has a valve hole that extends laterally and faces the downstream side in the gas passage direction;
(C2) a valve element that moves close to and away from the valve seat; (c3) magnetic force generating means that generates a magnetic force in a direction in which the valve element approaches the valve seat; A first space that communicates with the gas supply port of the flow path and a second space that communicates with the gas discharge port side of the gas flow path, and a force that pushes the diaphragm due to a differential pressure between the first and second spaces; A pressure fluctuation removing means having a diaphragm for opening and closing the valve body by a force for pushing the valve body by the front and rear differential pressure and a magnetic force given by the magnetic force generating means, and for separating the valve body from the valve seat as the maximum flow rate is approached; And
(D) The holding body is housed in the housing hole of the gas meter main body so as to be insertable / removable in the axial direction of the holding body, and the holding body protrudes outward near the valve seat in the gas flow direction of the gas flow path. The fluidic gas meter is characterized in that annular seal pieces 125, 125a are formed, and the seal pieces resiliently and airtightly contact the inner peripheral surface of the storage hole 113.

According to the present invention, the pressure fluctuation removing means 37 is inserted into the accommodating hole 113 of the gas meter main body, and the annular seal pieces 125, 125a formed on the holder 107 of the pressure fluctuation removing means 37 (FIG. 5) resiliently and hermetically contact the inner peripheral surface of the storage hole 113. Thereby, before and after the gas flow direction of the valve seat 82 formed on the holding body,
The gap 126 between the inner peripheral surface of the storage hole 113 and the outer peripheral surface of the holder 107 is made airtight, thereby preventing gas bypass.
Therefore, the function of suppressing the external gas pressure fluctuation noise by the pressure fluctuation removing means can be more accurately achieved.

[0018]

FIG. 1 is a longitudinal sectional view showing the vicinity of a pressure fluctuation removing means 37 according to an embodiment of the present invention. FIG.
FIG. 2 is a longitudinal sectional view of a part of a fluidic gas meter 31 including a pressure fluctuation removing unit 37 shown in FIG. 1. The fluidic gas meter 31 includes a main body 39,
And a lid 40 that air-tightly covers one surface 54 of the main body. The fluidic gas meter 31 has a gas supply port 32 and a gas discharge port 33, and a gas meter body 35 in which a gas flow path 34 communicating between the gas supply port 32 and the gas discharge port 33 is formed. A fluidic flow meter (measuring means) 36 which is interposed in the passage 34 and measures a gas flow rate based on an alternating pressure change generated by the passage of the gas; and a fluid flow meter 36 upstream of the fluidic flow meter 36 in the gas flow direction. A pressure fluctuation removing means 37 interposed in the gas flow path 34 for absorbing a pressure fluctuation of the gas transmitted through the upstream pipe; and a fluid flow meter 36 and a pressure fluctuation removing means 37 in the gas flow path 34. In addition, a shutoff valve 38 for shutting off the gas flow path 34 at the time of abnormality such as an earthquake, an excessive flow rate, an underflow rate, and a temperature rise detected by a seismic sensor is provided. Obtain.

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 and the pressure P2 on the gas discharge port 33 side of the gas flow path 34 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 P2 on the gas discharge port 33 side of the gas flow path 34 is reduced. And a diaphragm 43 made of a resilient material such as rubber and the like. The diaphragm 43 divides the diaphragm chamber 44 into a first space 45 communicating with the gas supply port 32 of the gas flow path 34 and a second space 46 communicating with the gas supply port 33 of the gas flow path 34. The pressure P1 in the first space 45 and the pressure P2 in the second space 46
The valve body 42 is opened and closed by the displacement of the diaphragm 43 due to the pressure difference (P1-P2). The valve chamber 67 on the downstream side of the valve element 42 is provided in the first space 4 where the diaphragm 43 faces.
5, and the pressure P2 acts on the diaphragm 43. Also, the pressure P2 in the second space 46
Is the same as the pressure on the gas outlet 33 side after passing through the fluidic element 50.

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 second space 46 is provided with the pressure introduction passage 4 in the gas outlet 33.
9, so that the gas outlet 33 and the second space 46 have the same pressure.

On the front side shown in FIG. 2 of the gas meter main body 35, a vibration detecting sensor 51 for detecting an alternating pressure change due to fluidic oscillation generated by the fluidic element 50 is provided. The fluid flow meter 36 is configured to include the vibration detection sensor 51. This fluidic flow meter 36
Can measure a flow rate of 150 L / h or more, but cannot detect a small flow rate of less than 150 L / h.
A flow sensor 52 capable of measuring a flow rate in a range of about 3 to 250 L / h is provided.

The pressure fluctuation removing means 37 has a valve chamber 67 in which the valve element 42 is housed.
Has a partition wall 68 for partitioning from the diaphragm chamber 44 in which the valve chamber 67 is housed, as described above.
And the diaphragm chamber 44, and the diaphragm 4
A throttle hole 69, which is a through hole that limits the operation speed of No. 3, is formed. The valve body 42 and the diaphragm 43 are coaxially connected by a valve rod 70, and the partition wall 68 is integrally formed with a sleeve 71 through which the connection rod 70 is displaceably inserted along its axis. In the sleeve 71, a sliding thrust bearing 72 made of a straight cylindrical metal having a good sliding property, for example, a material such as brass or iron plated with zinc on the surface, or a synthetic resin is housed. In this state, it is held movably in the axial direction.

FIG. 3 shows a peripheral portion 101 of the diaphragm 43.
It is an expanded sectional view of a vicinity. The diaphragm 43 is made of a resilient material such as rubber, for example.
3 swells toward the second space 46. This bulge 25
Peripheral portion 10 continuing radially outward from FIG. 3 (upward in FIG. 3)
1 has an annular fitting protrusion 102 and a seal portion 103. The annular fitting projection 102 and the seal 103 are formed on the base 104 extending to the radial direction outward from the bulge 253 on the right and left sides in FIG. 3, respectively.

A holding member 107 is formed by a bottomed cylindrical first holding portion 105 having the partition wall 68 as a bottom portion, and a cylindrical second holding portion 106 into which the cylindrical portion 108 of the first holding portion 105 is fitted. Be composed. The valve seat 82 is formed on the partition wall 124 of the second holding unit 106. Referring to FIG. 1, first holding portion 106 has a partition wall 124 in which valve hole 41 forming valve seat 82 is formed. In the second holding portion 106, gas outlet holes 110 and 111 communicating with the passage 58 downstream of the pressure fluctuation removing means 37 in the gas flow direction are formed at intervals in the circumferential direction. These gas outlet holes 110 and 111 are
The cross-sectional area of the flow passage is different, and the passage 58 and the valve chamber 6 are selectively provided.
Connect with 7. Further, a gas inflow hole 112 is formed on the upstream side of the valve seat 82 in the gas flow direction, and the gas supply port 3 is formed.
Connect to 2. The main body 39 of the gas meter main body 35 includes:
Storage hole 113 having a horizontal axis for storing holding body 107
Is formed. The holding body 107 is made of a synthetic resin material such as a Duracon resin or an ABS resin.
It has a right cylindrical shape, and the inner peripheral surface of
It is formed in a right cylindrical shape corresponding to the outer shape of 07. Storage hole 1
The opening 13 faces the opening side (the right side in FIG. 1) of the main body 39, so that the holding body 107 can be pushed into the storage hole 113 and inserted.

On the inner peripheral surface of the storage hole 113, the storage hole 1 is provided.
A stepped annular contact portion 114 is formed facing the opening side of the thirteen. The contact portion 114 is located on the axis 1 of the storage hole 113.
15 perpendicular to.

The seal portion 103 formed on the peripheral edge portion 101 of the diaphragm 43 faces the downstream side (left side in FIGS. 1 and 3) in the insertion direction 116 of the holder 107 into the storage hole 113. The seal portion 103 can resiliently and hermetically contact the contact portion 114.

Referring to FIG. 2 again, an end plate 119 is detachably attached to the end face 117 of the main body section 39 with a screw 120 via a packing 118 made of a material such as cork on the opening face facing the opening side. Mounted. This end plate 1
The end face 121 (see FIG. 1) of the second holding portion 106 is pushed in the insertion direction 116 of the storage hole 113 by 19, and the seal portion 103 can resiliently contact the contact portion 114 as described above. .

As shown in FIG. 7 described later, the diaphragm 43 is clamped between the support flange 201 and the clamping member 202 so that the end portion 76 of the valve stem 70 can be inserted.
22 and radially outward of the mounting portion 122,
The bulging portion 253 is continuous, and the bulging portion 253 is formed continuously inward in the radial direction of the peripheral portion 110. As shown in FIG. 3, the first holding portion 105 of the holding body 107 is formed with an annular fitting groove 123 facing the downstream side in the insertion direction 116 (left side in FIG. 3). An annular fitting projection 102 formed on the peripheral portion 101 of the diaphragm 43 is resiliently fitted into the annular fitting groove 123, and its fitting strength is particularly high when the gas meter 31 is assembled. Figure 107
When inserted in the insertion direction 116 together with the diaphragm 43, the valve element 42, the valve rod 70, and the like, in the insertion direction 116 as shown in FIG.
Is mounted with sufficient strength so as not to be detached from the annular fitting groove 123. This facilitates the assembling work, does not require another member for sealing the second space 46, can reduce the number of components, and facilitates the assembling work. This facilitates mass production of the gas meter 31.

FIG. 4 shows a partition 124 near the valve seat 82 of the first holding portion 106 in the embodiment shown in FIGS.
3 is a partial sectional view of FIG. FIG. 4A is a partial cross-sectional view of the first holding unit 106 in a natural state. An annular seal piece 125 projecting outward (upward in FIG. 4A) is formed on the partition wall 124 of the first holding portion 106. The thickness t1 of the annular seal piece 125 is relatively thin and can be elastically deformed and deformed. The thickness t1 is, for example, 0.
The height h1 in the radial direction may be, for example, 0.5 to 1 mm.

The holding body 107 in which the first and second cylindrical portions 105 and 106 are combined is inserted into the storage hole 113 of the main body 39.
When inserted in the insertion direction 116, as shown in FIG. 4B, the seal piece 125 comes into contact with the inner peripheral surface of the storage hole 113 so as to be elastically bent and contact airtightly. Therefore, between the gas inflow hole 112 and the gas outflow hole 110, the main body 39
The gas is prevented from flowing by bypass through the gap 126 between the inner peripheral surface of the storage hole 113 and the outer peripheral surface of the second holding portion 106. This makes it possible to reliably suppress external gas pressure fluctuation noise caused by the pressure fluctuation removing means 37, and to accurately measure the gas flow rate.

FIG. 5 is a sectional view showing a part of a second holding portion 106 according to another embodiment of the present invention. The embodiment shown in FIG. 5 is similar to the embodiment shown in FIGS. 1 to 4 described above, and the same reference numerals are used for the corresponding parts, and a suffix a is sometimes added. It should be noted that in this embodiment, a rigid annular seal piece 125a having a greater thickness t2 than the annular seal piece 125 shown in FIG. 4 is formed on the partition wall 124 of the second holding portion 106. . The outer shape of the seal piece 125a is the storage hole 113 formed on the upstream side of the passage 58 in the gas flow direction (to the right in FIG. 5).
Approximately equal to or slightly smaller than the inner diameter of
Thereby, the seal piece 125a is inserted into the storage hole 113 without being linked. The end surface 127 of the seal piece 125 a on the downstream side in the insertion direction 116 can abut on the inward flange 128 of the main body 39. This end face 129
Is perpendicular to the axis 115 of the storage hole 113, and can contact the end face 127 of the seal piece 125a in an airtight manner.
In the embodiment shown in FIG. 5 as well, gas flows through the gap 126 between the inner peripheral surface of the storage hole 113 and the inner peripheral surface of the second holding portion 106 on the upstream side in the gas flow direction with respect to the partition wall 124. Undesirably bypassed flow can be prevented.

FIG. 6 is a sectional view showing the valve seat 82 and the valve element 42. The valve body 42 has a bottomed cylindrical body 131 that can be inserted into and removed from the valve hole 41 of the holding body 86, and an annular convex part 132 provided on the cylindrical body 131. The cylindrical body 131 has a disc-shaped bottom 1.
33 and a cylindrical portion 134. The outer shape of the cylindrical portion 134 is
It has a right cylindrical shape. The contact surface of the annular projection 132 that can contact the valve seat 82 is perpendicular to the axis of the valve body 42.

When the end surface of the mounting cylinder 142a of the valve body 42 is in contact with the step 116 of the valve body 70 as shown in FIG. 6, one end 112 of the valve rod 70 is attached to the mounting cylinder of the valve body 42. The side opposite to the diaphragm 43 from the portion 142b (FIG. 3)
(To the right of the above) by a predetermined length Yj. According to the experiment of the present inventor, the length Yj is 4 to 6 mm. The valve stem 70 has a substantially horizontal axis, and the gas pressure on the gas supply port 32 side in FIG. 1 is higher than the gas pressure in the valve chamber 67, and therefore, the valve body 42 exerts a leftward force in FIG. Has always received.

A support flange 201 is formed integrally with the valve stem 70. This support flange 201 is
The end face facing the diaphragm 43 is perpendicular to the axis of the valve stem 70.

FIG. 7 is a sectional view showing a part of the diaphragm 43. The end 76 of the connecting rod 70 is inserted into the annular flat holding member 202. The support member 202 faces the diaphragm 43 on the side opposite to the support flange 201 (left side in FIG. 7). A mounting member 78 containing a permanent magnet piece 77 is fixed to the other end 76 of the valve stem 70. The connecting rod 70, the holding member 202, and the mounting member 78 are made of Duracon resin, ABS resin or other synthetic resin material, are manufactured by injection molding, and in another embodiment of the present invention, other materials that are non-magnetic. Or it may be made of a non-magnetic metal material such as aluminum.

An annular spacer 73 made of a nonmagnetic material and an annular suction piece 74 made of a ferromagnetic material are fitted on the sleeve 71. The attraction piece 74 and the permanent magnet piece 77 constitute a magnetic attraction means 81. Such magnetic attraction means 81
As a result, the valve body 42 has a valve seat 82 surrounding the valve hole 41.
Even if the valve 42 attempts to open due to pressure fluctuation due to disturbance or the like while seated on the valve seat, the state of sitting on the valve seat 82 can be maintained, whereby the pressure fluctuation can be attenuated, and the fluidic flow meter 36 This prevents the measurement accuracy from deteriorating.

[0037]

According to the first aspect of the present invention, the pressure fluctuation removing means and the fluidic flow meter are provided in this order in the gas flow path of the gas meter body along the gas passage direction. In the removing means, for example, the diaphragm, and thus the connecting rod and the valve body, are displaced in the horizontal direction, for example, in the horizontal direction by a differential pressure between the pressure on the upstream side of the horizontally extending valve hole and the pressure on the gas outlet side, At low flow rates, the valve body approaches the valve seat and increases pressure loss, thereby preventing pressure fluctuation noise of the gas whose flow rate is to be measured from propagating to the fluidic flow meter. As described above, since the connecting rod and the valve element are driven to be displaced laterally by the diaphragm, there is no need to increase the pressure receiving area of the diaphragm in order to increase the force acting on the diaphragm due to its own weight. Can be miniaturized.

In particular, according to the present invention, by inserting the holder of the pressure fluctuation removing means into the storage hole of the gas meter main body, the peripheral portion 101 of the diaphragm resiliently contacts the contact portion 114 of the storage hole. Air-tight abutment, so that the second
The space 46 is formed airtight, and the gas pressure on the gas outlet side downstream of the fluidic flow meter in the gas flow path is accurately transmitted to the second space. In this way, the production is easy, and the function of removing gas pressure fluctuation noise outside the pressure fluctuation removing means is reliably achieved.

According to the second aspect of the present invention, by mounting the end plate 119 on the end face 117 of the gas meter main body,
The holding body of the pressure fluctuation removing means is pressed to the downstream side in the insertion direction, so that the peripheral edge of the diaphragm is elastically and reliably pressed against the abutting portion, whereby airtightness is further ensured, and workability is good. , Mass production becomes easy.

According to the third aspect of the present invention, the annular fitting projection 102 of the diaphragm is fitted in the annular fitting groove 123 of the holder, and therefore, the holder 107 and the diaphragm 43 are integrated. In the state, the holder is inserted into the storage hole 113.
And the diaphragm does not come off the holder, which also simplifies the assembly operation and is suitable for mass production.

According to the fourth aspect of the present invention, the annular seal pieces 125, 125a formed on the holding body are
Resiliently and airtightly against the inner peripheral surface of the holding member, thereby preventing gas from bypassing and flowing into the gap between the inner peripheral surface of the storage hole and the outer peripheral surface of the holder, thereby ensuring airtightness. As a result, the function of suppressing the external gas pressure fluctuation noise by the pressure fluctuation removing means is more reliably achieved, the assembling work is easy, and the productivity is improved.

According to the fifth aspect of the present invention, the annular sealing pieces 125 and 125a of the holding member resiliently and air-tightly contact the inner peripheral surface of the storage hole 113 of the gas meter main body. Gas can be prevented from bypassing and flowing into the gap between the inner peripheral surface and the outer peripheral surface of the holding member 107, and as described above, the external gas pressure fluctuation noise can be suppressed and the assembling work can be easily performed. Therefore, productivity is improved.

[Brief description of the drawings]

FIG. 1 shows a pressure fluctuation removing unit 37 according to an embodiment of the present invention.
It is a longitudinal cross-sectional view of the vicinity.

FIG. 2 is a longitudinal sectional view of a part of a fluidic gas meter 31 including the pressure fluctuation removing unit 37 shown in FIG.

FIG. 3 is an enlarged sectional view of the vicinity of a peripheral portion 101 of the diaphragm 43.

FIG. 4 shows a first embodiment of the embodiment shown in FIGS.
FIG. 5 is a cross-sectional view of a part of a partition wall 124 near a valve seat 82 of a holding unit 106.

FIG. 5 is a cross-sectional view showing a part of a second holding unit 106 according to another embodiment of the present invention.

FIG. 6 is a sectional view showing a valve seat 82 and a valve element 42.

FIG. 7 is a sectional view showing a part of the diaphragm 43.

[Explanation of symbols]

 31 Fluidic Gas Meter 32 Gas Supply Port 33 Gas Outlet 34 Gas Flow Path 35 Gas Meter Main Body 36 Fluidic Flow Meter 37 Pressure Fluctuation Elimination Means 39 Main Body 40 Cover 41 Valve Hole 42 Valve Body 43 Diaphragm 50 Fluidic Element 70 Valve Rod 82 Valve seat 101 Peripheral edge 102 Annular fitting projection 103 Seal part 107 Holder 113 Storage hole 114 Contact part 115 Axis 116 Insertion direction 119 End plate 122 Mounting part 123 Annular fitting groove 124 Partition wall 125 Annular seal piece

Continued on the front page (72) Inventor Makoto Okabayashi 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture Inside Osaka Gas Co., Ltd. (72) Inventor Shuichi Okada 4-1-2, Hirano-cho, Chuo-ku, Osaka City, Osaka Prefecture No. Osaka Gas Co., Ltd. (72) Inventor Kazuichi Tomoda 4-7-31 Nishiiwata, Higashi-Osaka City, Osaka Prefecture Kansai Research Laboratory, Kinmon Co., Ltd. (72) Inventor Takuya Tadokoro 4 Nishiiwata, Higashi-Osaka City, Osaka Prefecture No. 7-31 Kansai Research Laboratories Kinmon Manufacturing Co., Ltd. (72) Inventor Tadao Shibuya 10 Nakadoji Kadamachicho, Shimogyo-ku, Kyoto-shi, Kyoto Inside Kansai Gas Meter Co., Ltd. (72) Masanobu Namimoto Shimogyo-ku, Kyoto-shi, Kyoto Kudocho, Chudo-ji 10 Kansai Gas Meter Co., Ltd. F-term (reference) 2F030 CA04 CA10 CB01 CB03 CC13 CD13 CD17 CF05 CF11 CF20 CH03 CH05 2F031 AA01 AB01 AC03 AD01

Claims (5)

[Claims] (A) a gas meter main body having a gas flow path communicating between a gas supply port and a gas discharge port; and (b) an alternating pressure change which is interposed in the gas flow path and generated by passage of gas. (C) pressure fluctuation removing means interposed in the gas flow path on the upstream side in the gas passage direction with respect to the gas flow direction to absorb the pressure fluctuation, and c1) a holder having a valve seat that communicates with the gas supply port and has a horizontally extending valve hole and faces the downstream side in the gas passage direction; (c2) a valve body that moves toward and away from the valve seat; (c3) (C4) a magnetic attraction force generating means for generating a magnetic attraction force in a direction in which the valve element approaches the valve seat when the flow rate is small due to the valve element and the valve seat; A first space communicating with the gas supply port; Partitioning into a second space communicating with the gas outlet side of the flow path, the first and second spaces
The valve body is opened and closed by a force that pushes the diaphragm due to the differential pressure in the space, a force that pushes the valve body due to the differential pressure across the valve body, and a magnetic attraction force that is given by the magnetic attraction force generating unit,
A pressure fluctuation removing means having a diaphragm for largely separating the valve body from the valve seat as the flow rate approaches the maximum flow rate. (D) The holding body 107 has a housing hole 113 for the gas meter main body.
And a stepped contact portion 114 is formed on the inner peripheral surface of the storage hole 113 facing the opening side of the storage hole, and is formed on the inner peripheral surface of the storage hole 113. The part 101 is provided in the insertion direction 11 of the holder.
6. A fluidic gas meter, which faces the downstream side of 6, and which elastically and hermetically contacts the contact portion 114. 2. An end plate 119 is attached to an end face 117 of the gas meter main body where the opening of the storage hole faces to close the storage hole, and the peripheral edge of the diaphragm is pressed against the contact portion by the end plate. Item 7. The fluidic gas meter according to Item 1. 3. The diaphragm has a mounting portion 122 mounted on the valve body, and a bulging portion 253 bulging into the second space 46 around the mounting portion 122 radially inward of the peripheral edge portion 110. An annular fitting groove 123 facing the downstream side in the insertion direction is formed in the holding body 107. The peripheral edge portion 110 has an annular fitting projection 102 fitted in the fitting groove 123 and a downstream side in the insertion direction. The fluidic gas meter according to claim 1, further comprising a protruding portion and a seal portion that comes into contact with the contact portion. 4. An annular seal piece 125, 1 protruding outward in the vicinity of the valve seat in the gas flow direction of the gas flow path.
The fluidic gas meter according to any one of claims 1 to 3, wherein a seal piece (25a) is formed, and the seal piece resiliently and airtightly contacts an inner peripheral surface of the storage hole (113). 5. A gas meter body in which a gas flow path communicating between a gas supply port and a gas discharge port is formed, and (b) an alternating pressure change which is interposed in the gas flow path and caused by the passage of gas. (C) pressure fluctuation removing means interposed in the gas flow path on the upstream side in the gas passage direction with respect to the gas flow direction to absorb the pressure fluctuation, and c1) a holder having a valve seat that communicates with the gas supply port and has a horizontally extending valve hole and faces the downstream side in the gas passage direction; (c2) a valve body that moves toward and away from the valve seat; (c3) (C4) a first space that is connected to the valve body and communicates the diaphragm chamber with a gas supply port of the gas flow path; and a gas flow path. And the second space communicating with the gas outlet side of the Divider, first and second
The valve body is opened and closed by a force that presses the diaphragm due to the differential pressure of the space, a force that presses the valve body due to the differential pressure across the valve body, and a magnetic force that is provided by the magnetic force generating means. Pressure fluctuation removing means having a diaphragm which is largely detached from the seat; and (d) the holding body is housed in a housing hole of the gas meter main body so as to be insertable and removable in the axial direction of the holding body. Near the valve seat in the gas flow direction of the road,
A fluidic gas meter, wherein annular seal pieces 125, 125a protruding outward are formed, and these seal pieces resiliently and air-tightly contact the inner peripheral surface of the storage hole 113.