JPH0674929U - Gas meter seal structure - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the airtightness of the gas meter, prevent leakage of the measured gas, and improve the measurement accuracy. A casing 4 in which a flow path of a gas to be measured is formed, and a blocking means 28 for blocking the flow path when an abnormality occurs are provided in the flow path. In the seal structure of the gas meter 1 in which the electromagnetic solenoid 25 is provided with the flange 26 attached to the casing 4.
6 is fixed to the casing 4 by at least three or more screw members 27a to 27c at intervals in the circumferential direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 INDUSTRIAL APPLICABILITY The present invention is a seal that can be suitably applied to a gas meter configured to externally attach a shutoff valve that shuts off a gas flow path to an opening of a casing when an abnormality such as an earthquake or excessive flow occurs. Regarding the structure.

[0002]

[Prior art]

 For example, a gas meter of a fluidic flow meter is provided with a shutoff unit that shuts off the flow path of a gas when an earthquake occurs or the gas flows at an excessive flow rate. The shut-off means has a valve body interposed in the flow passage and an electromagnetic solenoid for displacing and driving the valve body. The electromagnetic solenoid is attached to the casing in which the flow passage is formed. Is provided, which is screwed to the casing by two screws.

[0003]

[Problems to be solved by the device]

 In such a prior art, since the flange is fixed to the casing by two screws, the contact pressure of the flange on the casing is high near the screw and low in the region between the screws in the circumferential direction. In addition, there is a problem that airtightness is poor.

Therefore, an object of the present invention is to provide a gas meter seal structure capable of achieving high airtightness.

[0005]

[Means for Solving the Problems]

 The present invention comprises a casing in which a flow path of gas to be measured is formed, and a blocking means for blocking the flow path when an abnormality occurs, and the blocking means is interposed in the flow path. In a gas meter seal structure having a valve body and an electromagnetic solenoid for displacing and driving the valve body, the electromagnetic solenoid having a flange attached to the casing, wherein the flange is circumferentially spaced. The gas meter seal structure is characterized in that it is fixed to the casing by at least three or more screw members.

[0006]

[Action]

 According to the present invention, the flange provided on the electromagnetic solenoid is fixed to the casing by at least three or more screw members which are circumferentially spaced. As a result, the surface pressure of the flange on the casing can be made substantially uniform in the circumferential direction, and the airtightness is improved.

[0007]

【Example】

 FIG. 1 is a sectional view of a fluidic flowmeter 1 embodying the present invention as seen from the front side, and FIG. 2 is a sectional view as seen from the left side of FIG. The gas to be metered enters the casing 4 from the inlet 3, passes through the passage 5 and the valve hole 8 into the rectification space 9, and in this rectification space 9 passes through the two rectifiers 10 and 11 and is rectified. After that, the fluid passes through the nozzle hole 15 of the fluidic element 14 fitted in the measuring space 13 and is discharged from the outlet 18 while vibrating alternately as shown by imaginary lines 16 and 17. Supplied to gas consuming equipment not shown.

The alternating pressure change caused by the gas flow as shown by imaginary lines 16 and 17 in the fluidic element 14 is detected by the piezoelectric film sensor 20 through the detection hole 19 and detected. The gas flow rate corresponding to the value is digitally displayed in the display area 23 of the display means 21 realized by, for example, a liquid crystal display element.

In the flow path, a valve body 24 is provided upstream of the valve hole 8 in the gas flow direction A. The valve element 24 is displacement driven by an electromagnetic solenoid 25 attached to the outside of the casing 4 so as to close when an abnormality such as an earthquake or an excessive flow rate occurs. The electromagnetic solenoid 25 is provided with a generally triangular flange 26, which is fixed to the casing 4 by three screw members 27a, 27b, and 27c that are equally spaced in the circumferential direction. The valve body 24, the electromagnetic solenoid 25, and the flange 26 constitute the shutoff means 18.

FIG. 3 is an enlarged sectional view taken along the section line III-III in FIG. 2, and FIG. 4 is an exploded perspective view showing a state in which the breaking means 28 is removed from the casing 4. The valve chamber 29 in which the valve element 24 is housed is partitioned into the rectifying space 9 and the measuring space 13 by a partition wall 30 formed integrally in the casing 4, and through the valve hole 8. It is in communication. The valve hole 8 has an inner peripheral surface 8a of a truncated cone shape that is tapered from the valve chamber 29 toward the rectifying space 9, and an annular valve seat member 32 made of, for example, stainless steel is hermetically sealed by an O-ring 31. Is fitted in. The valve seat member 32 is attached to a ring piece 35 that is integrally formed at the tip of a plurality (three in this embodiment) of arms 34 of a guide member 33 made of synthetic resin, and the base end 36 of each arm 34 is attached. A plate-shaped base 37 is integrally formed with the base.

The valve seat member 32 is formed with a conical trapezoidal valve seat 38 that is tapered toward the valve chamber 29, and the valve body 24 abuts the entire circumference in the circumferential direction when the above-mentioned abnormality occurs. The valve chamber 29 and the rectifying space 9 are airtightly shut off from each other. Two spring bearing pieces 40, 41 are mounted on the plunger 39 of the electromagnetic solenoid 25, and the valve element is driven by the first and second compression coil springs 43, 44 interposed between the spring bearing pieces 40, 41. 24 is clamped. The spring force of the first compression coil spring 43 is selected to be larger than that of the second spring force, and when no abnormality occurs due to this, the valve body 24 separates from the valve seat 38 in the direction of arrow B2, and therefore the valve The chamber 29 and the rectifying space 9 communicate with each other through the valve hole 8, and the gas supplied from the inlet 3 is guided into the rectifying space 9. However, when the electromagnetic solenoid 25 is excited due to the occurrence of an abnormality, the valve body 24 is displaced in the arrow B1 direction and abuts on the valve seat 38. At this time, the valve body 24 is pressed by the spring force of the second compression coil spring 44, and the valve hole 8 is kept closed.

The electromagnetic solenoid 25 has an electromagnetic coil 45 that surrounds the plunger 39 and a holding piece 46 that holds the electromagnetic coil 45. The holding piece 46 is guided by the screws 47 a and 47 b to the flange 26 and the guide. It is screwed to the member 37. Each of the screws 47a and 47b is inserted in the right cylindrical sleeves 49a and 49b on the end plate 48 of the holding piece 46, and is supported by washers 50a and 50b. Both end faces of each sleeve 49a, 49b are perpendicular to each axis, whereby the end plate 48 can be uniformly pressed and fixed to the flange 26 with great strength.

The flange 26 is formed with three insertion holes 51a to 51c at equal intervals in the circumferential direction, and the respective shaft portions of the screws 27a to 27c are inserted therein. Since the flange 26 is fixed to the casing 4 by the three screws 27a to 27c in this manner, the outer surface 4a of the casing 4 and the inner peripheral surface 26a of the flange 26 are evenly distributed over the entire circumference in the circumferential direction. It can be brought into contact by surface pressure. Moreover, since an annular O-ring 53 is attached to the casing 4 and elastically contacts the inner peripheral surface 26a of the flange 26 radially inward of the insertion holes 51a to 51c, airtightness is maintained. It can be further improved.

In the above-described embodiment, the flange 26 is fixed to the casing 4 by the three screws 27a to 27c, but as another embodiment of the present invention, it may be fixed by more screws. Good. Also in this case, it is preferable that the intervals between the screws are equal in the circumferential direction.

The present invention can be suitably applied not only to the fluidic flowmeter but also to other gas meters such as a membrane gas meter.

[0016]

[Effect of device]

 As described above, according to the present invention, the flange provided with the electromagnetic solenoid is fixed to the casing by three or more screw members, so that the surface pressure of the flange to the casing can be made uniform in the circumferential direction. This makes it possible to improve the airtightness, reliably prevent gas leakage, and measure the gas flow rate with high accuracy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluidic flowmeter 1 in which the present invention is implemented, viewed from the front side.

FIG. 2 is a sectional view seen from the left side of FIG.

FIG. 3 is an enlarged sectional view taken along the section line III-III in FIG.

FIG. 4 is an exploded perspective view showing a state in which the breaking means 28 is removed from the casing 4.

[Explanation of symbols]

 1 Fluidic Flowmeter 3 Inlet 4 Casing 8 Valve Hole 9 Rectification Space 13 Metering Space 14 Fluidic Element 18 Outlet 20 Piezoelectric Membrane Sensor 21 Display Means 24 Valve Body 25 Electromagnetic Solenoid 26 Flange 27a to 27c Screw 28 Shutoff Means 30 Valve Seat Member 33 guide member 39 blanker 43 first compression coil spring 44 second compression coil spring 45 electromagnetic coil 46 holding piece

Claims (1)

[Scope of utility model registration request] 1. A casing having a flow path of gas to be measured formed therein, and a blocking means for blocking the flow path when an abnormality occurs, the blocking means being interposed in the flow path. A valve body and an electromagnetic solenoid for driving the valve body to displace, and the electromagnetic solenoid is provided with a flange attached to the casing. A seal structure for a gas meter, which is fixed to a casing by three or more screw members.