JPH08219846A - Gas meter - Google Patents

Abstract

PURPOSE: To shorten a required time for the installation of a gas meter by allowing a pressure fluctuation absorbing valve to operate normally even if the posture thereof tilts when the gas meter is installed in the gas meter equipped with the pressure fluctuation absorbing valve in which a primary side pressure fluctuation is absorbed by the change of a gas path area resulting from the movement of a disc-like valve body in an axis direction in response to a pressure difference between a primary side and a secondary side. CONSTITUTION: A pressure fluctuation absorbing valve is set in a partition plate 1 partitioning a primary side gas inflow chamber C1 and a secondary side gas amount measuring chamber C2 . The moving axis line of the valve body 2 of the pressure fluctuation absorbing valve is set to a horizontal posture, and a spring 5 energizing the valve body 2 in a valve closing direction is interposed between the valve body 2 and the supporting portion thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas meter, and more particularly to a gas meter equipped with a pressure fluctuation absorbing valve for absorbing pressure fluctuations of gas flowing into the gas meter.

[0002]

2. Description of the Related Art As the above gas meter,
Conventionally, there is one shown in FIG. In this stuff, gas
In the gas passage (C) in the meter (G), connect this to the upstream gas flow.
Enter (C₁) And the gas amount measuring chamber (C₂) And the horizontal
A posture partition plate (1) is provided, and this partition plate (1)
First pressure fluctuation absorption valve for flow rate (A₁) And a second pressure for large flow rates
Force fluctuation absorption valve (A ₂) And are provided. Absorption of each pressure fluctuation
The valve is formed in the partition plate (1) and is connected to the gas inflow chamber (C₁) And mo
Measurement room (C₂) And the communication port (11) that communicates with
Sliding on the valve stem (3) protruding upward from the center of (11)
A disc-shaped valve body (2) that fits freely on the outside and the partition plate (1)
From the outer peripheral surface of the valve body (2) and the inner peripheral surface faces upward.
It consists of a cylindrical part (6) that has a tapered shape with an enlarged diameter.
Has been established.

When the valve body (2) of the pressure fluctuation absorption valve is opened, this valve body (2) is on the primary side (gas inflow chamber (C ₁ ) side).
And the valve opening force due to the differential pressure on the secondary side (gas amount measurement chamber (C ₂ ) side) and the weight of the valve body (2) are in a balanced state. Then, in this state, when the pressure on the primary side rises, the valve body (2) moves upward according to the change in differential pressure due to this, but the weight etc. of the valve body (2) moves. Since it acts as a resistance, this causes pressure loss,
The transmission of the pressure increase to the secondary side is suppressed. That is,
The pressure fluctuation on the primary side is absorbed by the pressure fluctuation absorbing valve. The flow rate when the first pressure fluctuation absorption valve (A ₁ ) is opened from the fully closed state, that is, the valve opening operation flow rate is
It is set smaller than that of the second pressure fluctuation absorption valve (A ₂ ). Accordingly, when the flow rate is small, only the first pressure fluctuation absorption valve (A ₁ ) is opened, and when the flow rate is increased, the second pressure fluctuation absorption valve (A ₂ ) is also opened. Therefore, the pressure fluctuation absorbing effect can be obtained from a small flow rate to a large flow rate.

However, this prior art has the following problems. When the attitude of the gas meter (G) is tilted when installed, the valve shaft (3) of the valve device is tilted. However, since the direction of gravity acting on the valve body (2) is inclined with respect to the axis of the valve shaft (3), the valve opening force acting on the valve body (2) and the closing force by the gravity are closed. The relationship with the valve force will change. As a result, the pressure fluctuation absorption valve does not operate normally.

Therefore, when the gas meter (G) is installed, it must be accurately placed in an upright posture, which requires time for the installation. In particular, when the gas meter (G) is installed in the meter box, it is difficult to confirm whether or not the gas meter (G) is tilted in the front-rear direction from the front open side, and thus the installation requires time.

[0006]

[Technical Problem] The present invention has been made in view of the above-mentioned problems. "The disc-shaped valve body (2) moves in the axial direction according to the differential pressure between the primary side and the secondary side. Gas passage area changes and the pressure fluctuation absorption valve is designed to absorb the pressure fluctuation on the primary side, thereby increasing the pressure fluctuation absorption valve even when the posture of the gas meter is tilted. It is an object of the present invention to operate normally and reduce the time required for the installation.

[0007]

[Technical Means] The technical means of the present invention taken in order to solve the above-mentioned problem is that "a pressure fluctuation absorption valve is a gas inflow chamber (C ₁ ) on the primary side and a gas amount measurement chamber on the secondary side in a gas meter. (C ₂ ) is provided on the partition plate (1) and the movement axis of the valve body (2) of the pressure fluctuation absorption valve is set to a horizontal posture,
The spring (5) for urging the valve body (2) in the valve closing direction is interposed between (2) and the supporting portion thereof.

[0008]

The above technical means of the present invention operates as follows. In this case, the valve opening force due to the differential pressure between the primary side and the secondary side and the biasing force of the spring (5) are balanced to maintain the valve body (2) at a predetermined opening. In this valve open state, if the pressure on the primary side rises, the change in the differential pressure will cause a change in the valve body (2).
When moving to the secondary side, the biasing force or the like acts as a movement resistance, so that a pressure loss due to this acts and the transmission of the pressure increase to the secondary side is suppressed.

When installing this gas meter,
Even if the posture is tilted, as long as the operating axis of the valve body (2) is maintained in a horizontal posture, the valve opening force and spring acting on the valve body (2)
Since the relationship with the urging force in the valve closing direction due to (5) does not change, under this condition, even if the gas meter is installed in an inclined posture, the pressure fluctuation absorbing action is not easily impaired.

[0010]

[Effects] The present invention having the above-described structure has the following unique effects. When installing this gas meter, the pressure fluctuation absorbing valve operates normally as long as the operating axis of the valve body (2) is kept horizontal even if its posture is tilted. Can be shortened. [Others] As defined in claim 3, in the case where "the moving axis of the valve bodies of the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) is set parallel to the front surface of the gas meter", As long as the gas meter is upright as viewed from above, the movement locus of the valve body (2) is maintained horizontal even if the gas meter is installed inclining forward and backward. Therefore, it is easy to judge the quality of the installed state of the gas meter.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIGS. 2 to 4, a rectangular parallelepiped gas meter (G) is provided with a rectangular parallelepiped gas inflow chamber (C ₁ ) and a gourd-shaped gas amount measuring chamber (C ₂ ). Installed side by side with respect to the front of the gas meter, these gas inflow chamber (C ₁ ) and gas amount measurement chamber (C 1
_The partition plate (1) for partitioning them is placed at the lower end between ₂ ), and the first pressure fluctuation absorption valve for small flow rate is installed in this partition plate (1).
(A ₁ ) and the second pressure fluctuation absorption valve (A ₂ ) for large flow rate are arranged side by side vertically. In addition, on the upper surface of the gas meter (G), immediately above the gas inflow chamber (C ₁ ) and the gas amount measuring chamber (C ₂ ), a pair of gas pipe connecting portions (G ₁ ) which are respectively communicated with them.
(G ₁ ) is projected.

Each pressure fluctuation absorption valve is connected to a gas amount measuring chamber (C) from a central position of a communication port (11) formed through the partition plate (1).
₂ ) Disc-shaped valve body that slidably fits on the valve shaft (3) protruding toward the side and opens and closes the communication port (11) from the gas amount measuring chamber (C ₂ ) side.
(2) and a tubular portion (6) protruding from the partition plate (1) to the outer peripheral region of the valve body (2). The valve shaft (3) is connected to a thick disk-shaped support portion (14) supported by a plurality of support rods extending toward the center from the peripheral wall of the communication port (11), It stands upright with respect to the partition plate (1). As a result, the valve shaft (3) has a horizontal posture and is parallel to the front of the gas meter. The support portion (14) is positioned so as to contact the valve body (2) when the valve body (2) is in a fully closed state.

Further, a certain range from the shaft hole (21) for penetrating the valve shaft in the valve body (2) has a thick portion (2) protruding to the secondary side.
3), a mode in which the thick portion (23) and the disc (31) fixed to the tip of the valve shaft (3) are fitted onto the valve shaft (3) coaxially. The spring (5) is inserted. This allows
The valve body (2) is urged in the valve closing direction so that the communication port (11)
It is in contact with the valve seat (15) formed at the peripheral edge of the.

Further, the cylindrical portion (6) is formed such that the inner peripheral surface thereof is tapered so that the diameter thereof increases toward the secondary side, and the valve body (2)
The amount of separation (L) from the valve seat (15) is proportional to the gas passage area (H) between the valve body (2) and the tubular portion (6). The first pressure fluctuation absorption valve (A ₁ ) has a valve opening operation flow rate when the valve body (2) is opened from the fully closed state,
It is set smaller than that of the pressure fluctuation absorption valve (A ₂ ). As a result, when the flow rate is small, only the first pressure fluctuation absorption valve (A ₁ ) is opened, and when the flow rate is large, the second pressure fluctuation absorption valve (A ₂ ) is also opened. Therefore, the pressure fluctuation absorbing action described later is ensured from a small flow rate to a large flow rate.

Further, the valve body of the second pressure fluctuation absorption valve (A ₂ )
An annular seat (22) made of iron is provided on the primary side end surface of the thick portion (23) of (2), and is in contact with the fixed seat (9) made of permanent magnet provided in the support portion (14). Has become. Then, the iron piece adsorption holding force by the permanent magnet is set to a value that is separated when the first pressure fluctuation absorption valve (A ₁ ) is in the open state and the flow rate is the set flow rate. As a result, the second pressure fluctuation absorption valve (A
_{In 2} ), the fully closed state is reliably maintained. As a result, when the flow rate is small, the valve body (2) of the second pressure fluctuation absorption valve (A ₂ ) does not slightly move, and the operation of the first pressure fluctuation absorption valve (A ₁ ) is not affected. still,
The above-mentioned iron piece and permanent magnet are not provided in the first pressure fluctuation absorption valve (A ₁ ).

A valve chamber (B) communicating with the gas pipe connecting portion (G ₁ ) is provided above the gas inflow chamber (C ₁ ), and an opening (B ₁ ) is provided at the front surface of the valve chamber (B). Communicates with the gas inflow chamber (C ₁ ). And in the valve chamber (B), an opening (B ₁ )
A shutoff valve (7) including a movable valve (71) for opening and closing the valve and a drive section (72) for the movable valve (71) is provided. In addition, the gas amount measuring chamber (C
The reduced diameter portion (S) at the center of ₂ ) is equipped with a flow rate sensor (S ₁ ).

In the gas meter (G) having the above structure, depending on the flow rate, only the first pressure fluctuation absorption valve (A ₁ ) or the first and second
Both the pressure fluctuation absorption valves (A ₁ ) (A ₂ ) open. And
When the pressure in the gas inflow chamber (C ₁ ) rises in this valve open state, the change in the differential pressure between the primary side and the secondary side due to this causes the valve body (2) to move in the axial direction. Since the valve closing biasing force of the spring (5) acts as a movement resistance against this movement, a pressure loss occurs due to this. As a result, the amount of increase in the pressure change is greatly attenuated, and thus the pressure change is hardly transmitted to the gas amount measuring chamber (C ₂ ).

At the start of using the gas, the valve body (2) is in the closed state, but the gas pressure in the gas amount measuring chamber (C ₂ ) decreases and the valve inflow chamber (C ₁ ) becomes The valve opening state is brought about because the pressure difference between the pressures temporarily increases and the valve opening force due to this pressure difference becomes larger than the biasing force of the spring (5). When the gas is stopped, the pressure difference disappears and the valve body (2) closes. Also, when the valve is opened, there is a pressure loss when the gas flow passes through this pressure fluctuation absorption valve, so the gas amount measuring chamber (C ₂ )
The pressure of is a little lower than that of the gas inflow chamber (C ₁ ).

Furthermore, in this gas meter (G), since the valve shaft (3) of each pressure fluctuation absorption valve is installed in a horizontal posture parallel to the front of the gas meter, the posture is changed in the front-back direction when the gas meter is installed. Even when tilted, the horizontal posture of the valve shaft (3) is maintained. As a result, the relationship between the valve opening force acting on the valve body (2) and the biasing force of the spring (5) in the valve closing direction does not change, so that the pressure fluctuation absorbing action is unlikely to be impaired. The valve shaft (3) does not have to be parallel to the front of the gas meter as long as it is in a horizontal posture. In this case, as long as the inclination of the gas meter is around the axis of the valve shaft (3), the pressure fluctuation absorbing action is unlikely to be impaired.

[Regarding Modifications] In the above embodiment, the partition plate (1) is provided with a pair of large and small pressure fluctuation absorbing valves, but it may be configured to have one pressure fluctuation absorbing valve. ． In the above embodiment, the valve body of the second pressure fluctuation absorption valve (A ₂ )
The annular seat (22) of (2) is an iron piece and the fixed seat (9) is a permanent magnet, but this may be reversed. Further, the permanent magnet or the iron piece may not be provided.

[0021]. In the above embodiment, the valve shaft (3) is connected to the communication port (1
Although the structure for supporting at the center of 1) is adopted, the structure for supporting the valve shaft (3) may be another structure. For example, as shown in FIG. 6, the valve shaft (3) is supported by a plurality of L-shaped connecting bars (18) (18) which are continuously provided at the tip of the tubular portion (6) and is connected to the primary side. It may be extended. In this case, as shown in the same figure, the valve shaft (3) is slidably fitted into the support cylinder (25) protruding from the central portion of the valve body (2) to the secondary side,
A spring (5) may be interposed between the tubular portion (25) and the connecting bars (18, 18). Further, the structure for holding the spring (5) may be a structure other than the above-mentioned embodiment.

[Brief description of drawings]

FIG. 1 is a sectional view of a gas meter in a conventional example.

FIG. 2 is a sectional view of a gas meter according to an embodiment of the present invention.

FIG. 3 is a sectional view of the second pressure fluctuation absorption valve (A ₂ ).

FIG. 4 is an explanatory view of the partition plate (1) viewed from the gas inflow chamber (C ₁ ) side.

[Fig. 5] Upper sectional view of the gas inflow chamber (C ₁ )

FIG. 6 is a sectional view of a modified example of the pressure fluctuation absorption valve.

[Explanation of symbols]

(C ₁ ) ・ ・ ・ Gas inflow chamber (C ₂ ) ・ ・ ・ Gas amount measuring chamber (1) ・ ・ ・ Partition plate (2) ・ ・ ・ Valve body (3) ・ ・ ・ Valve shaft (5) ・ ・・ Spring (A ₁ ) ・ ・ ・ First pressure fluctuation absorption valve (A ₂ ) ・ ・ ・ Second pressure fluctuation absorption valve (21) ・ ・ ・ Shaft hole (22) ・ ・ ・ Annular seat (9) ・ ・ ・Fixed seat

Claims (4)

[Claims] 1. The disc-shaped valve body (2) moves in the axial direction according to the pressure difference between the primary side and the secondary side, and the gas passage area changes,
As a result, in a gas meter equipped with a pressure fluctuation absorption valve designed to absorb pressure fluctuations on the primary side, the pressure fluctuation absorption valve is installed in the gas inlet chamber (C
₁₎ and the secondary side of the gas amount measuring chamber (C ₂₎ and partition plate for partitioning (1)
In addition, the moving axis of the valve body (2) of the pressure fluctuation absorption valve is set to a horizontal posture, and the valve body (2) is closed between the valve body (2) and its supporting portion in the valve closing direction. A gas meter equipped with a spring (5) that biases against. 2. The partition plate (1) is provided with a first pressure fluctuation absorption valve (A ₁ ) for a small flow rate and a second pressure fluctuation absorption valve (A ₂ ) for a large flow rate, and one of the first The gas meter according to claim 1, wherein the valve opening flow rate of the first pressure fluctuation absorbing valve (A ₁ ) is set smaller than that of the other second pressure fluctuation absorbing valve (A ₂ ). 3. The gas meter according to claim 2, wherein the moving axes of the valve bodies of the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) are set parallel to the front of the gas meter. 4. The second pressure fluctuation absorption valve (A ₂ ) has a structure in which a valve body (2) is slidably fitted onto a valve shaft (3), and the valve in the valve body (2) is The annular seat (22) on the outer periphery of the shaft hole (21) for shaft penetration and the annular seat (22) at the valve closed position of the valve body (2).
One of the fixed seats (9) facing the permanent magnet is one and the other is an iron piece attracted to this permanent magnet, and the iron piece attracting and holding force by the permanent magnet is the first pressure fluctuation absorbing valve (A ₁ ) in the open state. The gas meter according to claim 2, wherein the gas meter is set to such a value that the flow rate is set and the flow rate is separated from the set flow rate.