阅读说明：本技术 气量计 (gas meter ) 是由 杉山正树 片瀬博昭 永沼直人 于 2018-05-10 设计创作，主要内容包括：气量计包括：气量计主体(103),其具有供被测量流体流入的气量计入口(101)和供被测量流体流出的气量计出口(102)；以及伸出部(101a),其自气量计入口(101)向气量计主体(103)的内部伸出。另外,气量计包括：流量测量单元(10),其内装于气量计主体(103)内,具有包括被测量流体的导入部(12a)和导出部(12b)在内的直管状的测量流路(12)；以及截止阀(14),其配置于伸出部(101a)的内部通路(101b)。此外,流量测量单元(10)的导入部(12a)气密地连接于伸出部(101a)并且与内部通路(101b)相连通。(The gas meter includes: a gas meter body (103) having a gas meter inlet (101) into which a fluid to be measured flows and a gas meter outlet (102) out of which the fluid to be measured flows; and a protruding portion (101a) that protrudes from the gas meter inlet (101) into the interior of the gas meter body (103). In addition, the gas meter includes: a flow rate measurement unit (10) which is housed in the gas meter body (103) and has a straight tubular measurement flow path (12) including an introduction section (12a) and a discharge section (12b) of a fluid to be measured; and a shut valve (14) disposed in the internal passage (101b) of the extension (101 a). Furthermore, an introduction portion (12a) of the flow rate measurement unit (10) is connected to the extension portion (101a) in an airtight manner and communicates with the internal passage (101 b).)

1. A gas meter, wherein,

The gas meter includes:

A gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet out of which the fluid to be measured flows;

A projecting portion projecting from the gas meter inlet toward an interior of the gas meter main body;

A flow rate measurement unit which is incorporated in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of the fluid to be measured; and

a shut-off valve disposed in the internal passage of the extension portion,

the introduction portion of the flow rate measurement unit is hermetically connected to the protruding portion and communicates with the internal passage.

2. The gas meter of claim 1,

The gas meter inlet and the gas meter outlet are linearly arranged,

The flow rate measurement unit is configured to substantially match a center line of the measurement flow path with a center line connecting the gas meter inlet and the gas meter outlet.

3. A gas meter, wherein,

The gas meter includes:

A gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet out of which the fluid to be measured flows;

a projecting portion projecting from the gas meter outlet toward an inside of the gas meter main body;

A flow rate measurement unit which is incorporated in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of the fluid to be measured; and

a shut-off valve disposed in the internal passage of the extension portion,

The lead-out portion of the flow rate measurement unit is hermetically connected to the protruding portion and communicates with the internal passage.

4. The gas meter of claim 3,

The gas meter inlet and the gas meter outlet are arranged substantially linearly,

the flow rate measurement unit is configured to substantially match a center line of the measurement flow path with a center line connecting the gas meter inlet and the gas meter outlet.

Technical Field

The present invention relates to a gas meter equipped with a flow rate measurement unit for measuring a flow rate of a fluid such as a gas and having a shutoff function.

Background

As for a flow meter such as a gas meter, a so-called electronic meter using an ultrasonic wave or a flow sensor is put to practical use, and as an application thereof, a flow rate measurement unit capable of individually measuring a flow rate and a gas meter using the flow rate measurement unit are proposed.

The gas meter incorporates a shutoff valve as a protective function member for monitoring the flow rate of the gas and shutting off the gas in the case of an abnormality.

fig. 7 shows the gas meter as described above, and a flow rate measurement unit 403 is housed in a gas meter 400 having an inlet 401 and an outlet 402. A shutoff valve 405 is connected to the inlet 401, and the gas entering from the inlet 401 is diffused into the body of the gas meter 400 through a passage in the shutoff valve 405. The gas that is the fluid to be measured diffused in the main body of the gas meter 400 flows in from the inlet 403a of the flow rate measuring unit 403 and flows out from the outlet 403b connected to the outlet pipe 404 (see, for example, patent document 1).

As another embodiment, a gas meter 500 as shown in fig. 8 is also proposed. The gas meter 500 is configured such that a shutoff valve 502 and a flow rate measurement unit 503 are externally attached to a middle portion of a straight pipe-shaped pipe 501 (see, for example, patent document 2).

Disclosure of Invention

However, in the gas meter described in patent document 1, since the flow rate measurement unit 403 and the stop valve 405 are separated from each other, the gas diffused into the gas meter 400 through the stop valve 405 flows into the flow rate measurement unit 403 from each direction, and therefore, the inflow state of the gas flowing into the flow rate measurement unit 403 is difficult to be constant due to the influence of the shape and size of the inside of the gas meter 400, and it is necessary to optimize the shape, the flow rate coefficient, and the like of the flow rate measurement unit 403 one by one in accordance with the shape of the body of the gas meter.

In the case of the gas meter described in patent document 2, an opening 501a for attaching the flow rate measurement unit 50 and an opening 501b for attaching the shutoff valve 502 are formed in the pipe 501. Therefore, there is a problem that the gas meter is difficult to be miniaturized. Alternatively, it is necessary to ensure airtightness against gas leakage in the openings 501a and 501b, respectively, and therefore there is a problem that the sealing structure is complicated.

The invention provides a gas meter which has a shut-off function, can perform stable flow measurement regardless of the shape of a built-in gas meter, and can be miniaturized.

The gas meter according to an aspect of the present invention includes: a gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet from which the fluid to be measured flows; a protruding portion protruding from the gas meter inlet toward the inside of the housing; a flow rate measurement unit which is built in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of a fluid to be measured; and a shut-off valve disposed in the internal passage of the protruding portion, wherein the introduction portion of the measurement unit is connected to the protruding portion in an airtight manner and communicates with the internal passage.

As a result, the flow of gas from the shutoff valve to the flow rate measurement unit becomes constant, so that stable flow rate measurement can be performed regardless of the shape of the gas meter, and the shutoff valve and the flow rate measurement unit can be directly connected at the shortest distance, so that the gas meter can be downsized.

In addition, since the flow of the gas from the shutoff valve to the measurement flow path is constant, stable flow measurement can be performed regardless of the shape of the gas meter.

The gas meter according to the present invention can perform stable flow rate measurement regardless of the shape of the gas meter main body, and can directly connect the shutoff valve and the flow rate measurement unit at the shortest distance, thereby achieving downsizing of the gas meter.

In addition, a gas meter according to another aspect of the present invention includes: a gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet from which the fluid to be measured flows; a protruding portion protruding from the gas meter outlet to the inside of the gas meter main body; a flow rate measurement unit which is built in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of a fluid to be measured; and a shutoff valve disposed in the internal passage of the extension portion, wherein the lead-out portion of the flow rate measurement unit is hermetically connected to the extension portion and communicates with the internal passage.

In this way, the flow rate measuring unit and the shutoff valve can be integrated, and the shutoff valve and the flow rate measuring unit can be directly connected at the shortest distance, so that the gas meter can be downsized.

In addition, since the flow of gas is made constant by the shutoff valve, stable flow rate measurement can be performed regardless of the shape of the gas meter.

In the gas meter according to the present invention, the shutoff valve and the flow rate measurement unit can be directly connected at the shortest distance, and therefore, the gas meter can be miniaturized.

Drawings

fig. 1 is a side sectional view of an essential part of a gas meter according to embodiment 1 of the present invention.

Fig. 2 is a side sectional view of the gas meter according to embodiment 1 of the present invention.

Fig. 3 is a side sectional view of a main part of a gas meter according to embodiment 2 of the present invention.

Fig. 4 is a side sectional view of the gas meter according to embodiment 2 of the present invention.

Fig. 5 is a side sectional view of a main part of a gas meter according to embodiment 3 of the present invention.

Fig. 6 is a side sectional view of a gas meter according to embodiment 3 of the present invention.

fig. 7 is a cross-sectional view of a conventional gas meter using a flow rate measurement unit.

Fig. 8 is a sectional view of a conventional gas meter using another flow rate measurement unit.

Detailed Description

Hereinafter, embodiments of the gas meter according to the present invention will be described with reference to the drawings. The same components are denoted by the same reference numerals. The components already described are not described again. The embodiments described below do not limit the present invention.

In this specification, a gas meter is connected to a pipe for transporting a fluid and measures the flow rate of the fluid flowing through the pipe. The gas meter is equipped with a flow rate measurement unit that measures the flow rate of the fluid. That is, the flow measuring unit is provided as a component of the gas meter.

(embodiment 1)

fig. 1 is a side sectional view of a main part of a gas meter 100 according to embodiment 1. Fig. 2 is a side sectional view of the gas meter 100 according to embodiment 1 including the shutoff valve 14 and the flow rate measurement unit 10.

The gas meter 100 has a gas meter inlet 101 and a gas meter outlet 102 on the same surface (upper portion in fig. 1 and 2) of a gas meter main body 103, and the flow rate measurement unit 10 and the shutoff valve 14 are housed in the gas meter main body 103 in a coupled state.

a protruding portion 101a protruding into the gas meter main body 103 is formed at the gas meter inlet 101. In the present embodiment, a screw 101d for connecting a pipe is formed at an inlet portion of the gas meter inlet 101, and the gas meter inlet 101 and the protruding portion 101a are integrally formed.

An internal passage 101b is formed inside the extension 101 a. The outlet 101c of the extension 101a is connected to the inlet 12a of the flow rate measurement unit 10, and the internal passage 101b communicates with the measurement flow path 12. The extension 101a is provided with a mounting portion 101e of the drive device 19, and the flange 19a of the drive device 19 is fixed to the mounting portion 101e in an airtight manner with an O-ring 19b interposed therebetween by screws or the like, not shown. Further, a valve seat 17 is formed in the middle of the internal passage 101b, and the valve body 15 driven by the driving device 19 is brought into contact with the valve seat 17 to block the internal passage 101b, thereby blocking the flow of the gas flowing from the gas meter inlet 101.

The driving device 19 includes a motor 16 and a linear motion mechanism, the motor 16 includes a stator 16a, a rotor 16b, and a rotary shaft 16c, and the linear motion mechanism converts rotation of the rotary shaft 16c into linear motion by screwing a female screw 15a of the valve body 15 to a male screw 16d provided at a tip end of the rotary shaft 16c, and the driving device 19 moves the valve body 15.

The flow rate measurement unit 10 is formed of a measurement flow path 12 and a flow rate measurement module 13, the measurement flow path 12 having an introduction portion 12a and a discharge portion 12b of gas as a fluid to be measured, and the flow rate measurement module 13 measuring a flow rate of the gas flowing through the measurement flow path 12.

The flow rate measurement unit 10 uses a measurement method using ultrasonic waves. Specifically, the time during which, for example, an ultrasonic wave transmitted from one ultrasonic transceiver 13a into the measurement channel 12 propagates through the gas, is reflected by the inner wall 12c of the measurement channel 12 facing the one ultrasonic transceiver 13a, and further propagates through the gas until the ultrasonic wave is received by the other ultrasonic transceiver 13b is measured using the pair of ultrasonic transceivers 13a and 13b provided in the flow rate measurement module 13. Then, the flow velocity of the gas is obtained from the time, and finally the flow rate of the gas is obtained.

As described above, according to the gas meter 100 of the present embodiment, since the shutoff valve 14 is directly connected to the flow rate measurement unit 10 and the gas as the fluid to be measured is directly flowed into the measurement flow path without being diffused into the gas meter main body 103, a constant flow can be formed without being affected by the shape of the gas meter main body 103. Therefore, stable flow rate measurement can be performed regardless of the shape of the gas meter main body, and the shutoff valve 14 and the flow rate measurement unit 10 can be directly connected at the shortest distance, so that the gas meter 100 can be downsized.

(embodiment 2)

Fig. 3 is a side sectional view of a main part of a gas meter 200 of embodiment 2. Fig. 4 is a side sectional view of the gas meter 200 of embodiment 2 including the shutoff valve 14 and the flow rate measurement unit 10.

In the gas meter 200, a gas meter inlet 201 and a gas meter outlet 202 are provided on opposing surfaces (right and left surfaces in fig. 3 and 4) of a gas meter main body 203 so that center lines thereof are in a straight line, and a flow rate measurement unit 10 and a shutoff valve 14 are housed in the gas meter main body 203 in a coupled state. Further, the gas meter main body 203 is formed of a lower case 204 and an upper case 205, and a gas meter inlet 201 and a gas meter outlet 202 are provided on the lower case 204 side.

a protruding portion 201a protruding into the gas meter main body 203 is formed at the gas meter inlet 201. In the present embodiment, a screw 201d for connecting a pipe is formed at an inlet portion of the gas meter inlet 201, and the gas meter inlet 201 and the protruding portion 201a are formed integrally.

An internal passage 201b is formed inside the extension 201 a. The outlet 201c of the extension 201a is connected to the inlet 12a of the flow rate measurement unit 10, and the internal passage 201b communicates with the measurement flow path 12. The extension 201a is provided with a mounting portion 201e of the drive device 19, and the flange 19a of the drive device 19 is fixed to the mounting portion 201e in an airtight manner with an O-ring 19b interposed therebetween by screws or the like, not shown. Further, a valve seat 17 is formed in the middle of the internal passage 201b, and the valve body 15 driven by the driving device 19 is brought into contact with the valve seat 17 to block the internal passage 201b, thereby blocking the flow of the gas flowing from the gas meter inlet 201.

With the above configuration, the same effects as those of embodiment 1 can be obtained. Further, as shown in fig. 4, the centers of the gas meter inlet 201, the inlet portion 12a, the outlet portion 12b, and the gas meter outlet 202 are arranged in the same straight line, and therefore, the gas meter can be further downsized compared to embodiment 1. Further, the gas meter can be attached to the middle of the linear pipe, and the degree of freedom of installation is improved.

(embodiment 3)

Fig. 5 is a side sectional view of a main part of a gas meter 210 according to embodiment 3. Fig. 6 is a side sectional view of the gas meter 210 according to embodiment 3 including the shutoff valve 24 and the flow rate measurement unit 20.

In the gas meter 210, a gas meter inlet 211 and a gas meter outlet 212 are provided on opposing surfaces (right and left surfaces in fig. 5 and 6) of a gas meter main body 213 so that center lines thereof are aligned, and the flow rate measurement unit 20 and the shutoff valve 24 are housed in a state of being coupled together in the gas meter main body 213. Further, the gas meter main body 213 is formed of a lower case 214 and an upper case 215, and a gas meter inlet 211 and a gas meter outlet 212 are provided on the lower case 214 side.

A protruding portion 212a protruding into the gas meter main body 213 is formed at the gas meter outlet 212. In the present embodiment, a screw 212d for connecting a pipe is formed at an outlet portion of the gas meter outlet 212, and the gas meter outlet 212 and the stop valve 24 are hermetically connected by an O-ring seal or the like, not shown. The stop valve 24 and the extension 212a may be integrally formed as shown in the drawing.

An internal passage 212b is formed inside the extension 212 a. The inlet 212c of the extension 212a is connected to the lead-out portion 22b of the flow rate measurement unit 20, and the internal passage 212b communicates with the measurement flow path 22. The extension portion 212a is provided with a mounting portion 212e of the drive unit 29, and the flange 29a of the drive unit 29 is fixed to the mounting portion 212e of the gas meter outlet 212 in an airtight manner with a screw or the like, not shown, through the O-ring 29 b. Further, a valve seat 27 is formed in the middle of the internal passage 212b, and the valve body 25 driven by the driving device 29 is brought into contact with the valve seat 27 to block the internal passage 212b and block the flow of the gas flowing out from the gas meter outlet 212.

The driving device 29 includes a motor 26 and a linear motion mechanism, the motor 26 includes a stator 26a, a rotor 26b, and a rotary shaft 26c, and the driving device 29 converts rotation of the rotary shaft 26c into linear motion by screwing a female screw 25a of the valve body 25 to a male screw 26d provided at a tip end of the rotary shaft 26c, and moves the valve body 25.

The flow rate measurement unit 20 is formed of a measurement flow path 22 and a flow rate measurement block 23, the measurement flow path 22 having an introduction portion 22a and a discharge portion 22b of gas as a fluid to be measured, and the flow rate measurement block 23 measuring a flow rate of the gas flowing through the measurement flow path 22.

The flow rate measurement unit 20 uses a measurement method using ultrasonic waves. Specifically, the time during which, for example, an ultrasonic wave transmitted from one ultrasonic transceiver 23a into the measurement channel 22 propagates through the gas, is reflected by the inner wall 22c of the measurement channel 22 facing the one ultrasonic transceiver, and further propagates through the gas until the ultrasonic wave is received by the other ultrasonic transceiver 23b is measured using the pair of ultrasonic transceivers 23a and 23b provided in the flow rate measurement module 23. Then, the flow velocity of the gas is obtained from the time, and finally the flow rate of the gas is obtained.

As described above, according to the gas meter 210 of the present embodiment, the shutoff valve 24 and the flow rate measurement unit 20 can be directly connected to each other at the shortest distance by directly connecting the shutoff valve 24 and the flow rate measurement unit 20 to each other, and therefore, the gas meter 210 can be downsized. Further, the gas meter 210 can be attached to the middle of the linear pipe, and the degree of freedom of installation is improved.

As described above, the gas meter disclosed in the 1 st publication includes: a gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet from which the fluid to be measured flows; and a protruding portion protruding from the gas meter inlet toward the inside of the housing. In addition, the gas meter includes: a flow rate measurement unit which is built in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of a fluid to be measured; and a shut valve disposed in the internal passage of the extension portion. Further, the introduction portion of the flow rate measurement unit is hermetically connected to the protruding portion and communicates with the internal passage.

With this configuration, since the flow of gas from the shutoff valve to the flow rate measurement unit is constant, stable flow rate measurement can be performed regardless of the shape of the gas meter, and the shutoff valve and the flow rate measurement unit can be directly connected at the shortest distance, thereby enabling downsizing of the gas meter.

In the gas meter according to claim 2, in addition to the gas meter according to claim 1, the gas meter inlet and the gas meter outlet may be linearly arranged, and the flow rate measurement unit may be arranged such that a center line of the measurement flow path substantially coincides with a center line connecting the gas meter inlet and the gas meter outlet.

The gas meter disclosed in the 3 rd publication comprises: a gas meter body having a gas meter inlet into which a fluid to be measured flows and a gas meter outlet from which the fluid to be measured flows; and a protruding portion protruding from the gas meter outlet to the inside of the gas meter main body. In addition, the gas meter includes: a flow rate measurement unit which is built in the gas meter main body and has a straight pipe-shaped measurement flow path including an introduction portion and a discharge portion of a fluid to be measured; and a shut valve disposed in the internal passage of the extension portion. Further, the lead-out portion of the flow rate measurement unit is hermetically connected to the protruding portion and communicates with the internal passage.

With this configuration, the shutoff valve and the flow rate measurement unit can be directly connected at the shortest distance, and therefore the gas meter can be downsized.

In the gas meter according to claim 4, in addition to the gas meter according to claim 3, the gas meter inlet and the gas meter outlet may be arranged substantially linearly, and the flow rate measurement unit may be arranged such that a center line of the measurement flow path substantially coincides with a center line connecting the gas meter inlet and the gas meter outlet.

Industrial applicability

The gas meter of the invention can realize the miniaturization of the gas meter with the cut-off function.

Description of the reference numerals

10. 20, a flow measurement unit; 12. 22, measuring the flow path; 12a, 22a, an introduction part; 12b, 22b, a lead-out section; 14. 24, a stop valve; 19. 29, a driving device; 100. 200, 210, gas meter; 101. 201, 211, gasometer inlet; 101a, 201a, 212a, extension; 101b, 201b, 212b, internal passages; 102. 202, 212, gas meter outlet; 103. 203, 213 and a gas meter main body.