JPH08226841A - Gas meter - Google Patents

Abstract

PURPOSE: To provide a gas meter in which the manual operation of a pressure change absorption valve in a tilted state is ensured, whose installation time is shortened, in which the cross section of a gas flow passage in which the pressure change absorption valve has been installed is made small and which can be miniaturized. CONSTITUTION: A gas meter is provided with a first pressure change absorption valve A1 , for a small flow rate, and a second pressure change absorption valve A2 , for a large flow rate, which are of a type in which a disk-shaped valve body is moved to the direction of an axial line so as to absorb a pressure change on the primary side. Then, in the second pressure change absorption valve A2 , a second valve body 2b is fitted externally, so as to be freely slidable, to a hollow valve shaft 3b which is passed through the center of a passage port 11 and both ends of which are opened, a second spring 5b which energizes the second valve body 2b to a valve closing direction is provided, and the axial line of the hollow valve shaft 3b is set to a horizontal posture. In addition, in the first pressure change absorption valve A1 , a first valve body 2a which is supported coaxially on the downstream side of the hollow valve shaft 3b is faced with a valve seat body 4 installed at the downstream end of the hollow valve shaft 3b, and a first spring 5a which energizes the first valve body 2a to a valve closing direction is provided.

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 having a pressure fluctuation absorbing valve for absorbing pressure fluctuations of gas passing through the gas meter.

[0002]

2. Description of the Related Art As the gas meter, there is a conventional one shown in FIG. This gas meter
In (G), these gas inflow chambers (C ₁ ) are located in the gas flow path between the upstream gas inflow chamber (C ₁ ) and the downstream gas amount measurement chamber (C ₂ ).
The horizontal support plate (T) is arranged so as to partition the gas amount measuring chamber (C ₂ ) and the gas amount measuring chamber (C ₂ ), and the support plate (T) has a disk shape that opens and closes due to the differential pressure between the gas chambers. A pair of first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) having a valve body are provided.

Further, each pressure fluctuation absorption valve has a communication port (11) provided in the support plate (T) so that the gas chambers communicate with each other.
And a valve body (2) that opens and closes the communication port (11) from above (from the gas amount measuring chamber (C ₂ ) side), and the valve body (2) that stands upright with respect to the support plate (T). The shaft part (3) with which the
A cylindrical portion that stands upright from the support plate (T) to the outer peripheral area of the valve body (2).
It consists of (6) and.

When the valve body (2) of the pressure fluctuation absorbing valve is open, this valve body (2) is on the primary side (gas inflow chamber (C ₁ ) side).
And the valve opening force by the differential pressure and dynamic 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, a pressure loss is generated due to this, and 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 first pressure fluctuation absorption valve (A ₁ )
The flow rate when the valve is opened from the fully closed state, that is, the valve opening operation flow rate 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 above-mentioned pressure fluctuation absorbing effect is 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 installing the gas meter (G), the gas meter (G) must be correctly placed in an upright posture, which requires time for 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. Further, in this prior art, the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) are arranged in parallel in the gas flow path,
The cross section of the gas channel becomes large. Therefore, the entire size of this gas meter cannot be reduced.

[0007]

The present invention has been made in view of the above-mentioned problems. "The disc-shaped valve body moves in the axial direction in accordance with the differential pressure between the primary side and the secondary side to cause gas passage. A gas meter equipped with a pressure fluctuation absorption valve whose area changes to absorb the pressure fluctuation on the primary side, and the amount of gas on the primary side gas inlet chamber (C ₁ ) and the secondary side in the gas meter. Measuring room (C ₂ )
The first pressure fluctuation absorption valve for small flow rate (A
₁ ) and a second pressure fluctuation absorption valve (A ₂ ) for large flow rate, and the valve opening operation flow rate of the first pressure fluctuation absorption valve (A ₁ )
In the gas meter set to be smaller than that of the second pressure fluctuation absorption valve (A ₂ ), the pressure fluctuation absorption valve operates normally even if the installation attitude of this gas meter is inclined, and the time required for the installation is reduced. It is an object to reduce the size of this gas meter by shortening it and reducing the cross section of the gas flow path provided with the pressure fluctuation absorption valve. [Invention of Claim 1]

[0008]

[Technical Means] The technical means of the present invention taken to solve the above-mentioned problem is that "the second pressure fluctuation absorption valve (A ₂ ) is a passage port".
A hollow valve shaft (3b) provided at both ends of the hollow valve shaft (3b) penetrating the center of (11), a second valve body (2b) slidably fitted on the hollow valve shaft (3b), The second valve body (2b) is constituted by a second spring (5b) for urging the valve body in the closing direction, and the axis of the hollow valve shaft (3b) is set in a horizontal posture. ₁ )
Includes a first valve body (2a) supported coaxially with the hollow valve shaft (3b) on the downstream side of the hollow valve shaft (3b), and the hollow valve shaft (3
The valve seat body (4) for the first valve body (2a) provided at the downstream end of b)
And the first spring (5) for urging the first valve body (2a) in the valve closing direction.
a) It is composed of and.

[0009]

The above technical means of the present invention operates as follows. The valve seat body (4) provided at the downstream end of the hollow valve shaft (3b) which is open at both ends and which penetrates the center of the passage (11) of the second pressure fluctuation absorbing valve (A ₂ ) absorbs the first pressure fluctuation. Since the first valve body (2a) of the valve (A ₁ ) is opposed, the first valve body (2a) is opened by the valve opening force by the gas flow in the hollow valve shaft (3b) at a small flow rate. To speak. When the flow rate is large, the first valve body (2a) fitted on the hollow valve shaft (3b) is opened by the valve opening force of the gas flow in the passage port (11).

In each of the first and second valve bodies (2a) and (2b), the valve opening force due to the differential pressure between the primary side and the secondary side and the biasing force of the spring are balanced in the valve open state. Then, the opening is maintained at a predetermined value. And when the pressure on the primary side rises,
When the valve body moves to the secondary side due to the change in differential pressure due to this, the biasing force and the like act as movement resistance, which causes pressure loss and suppresses the transmission of the pressure increase to the secondary side. To be

Further, since the first valve body (2a) is supported coaxially with the horizontal hollow valve shaft (3b), the movement of the first and second valve bodies (2a) (2b). Both axes are horizontal. Therefore, when installing the gas meter, the hollow valve shaft (3
As long as b) is maintained in a horizontal position, the relationship between the valve opening force acting on each valve element and the biasing force of the spring in the valve closing direction does not change, so under this condition the pressure fluctuation absorbing action is not impaired. .

Further, in this gas meter, the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) are provided in series in the axial direction.

[0013]

[Effects] The present invention having the above-described structure has the following unique effects. In this gas meter, the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) can be normally operated as long as the axis of the hollow valve shaft (3b) is maintained in a horizontal position even if the installation position is inclined. Since it operates, the time required to install this gas meter can be shortened.

Also, in this gas meter, the first and second
Since the pressure fluctuation absorption valve (A ₁ ) (A ₂ ) is installed in series,
The cross section of the gas flow path provided with these pressure fluctuation absorption valves can be made smaller than the conventional one in which these two pressure fluctuation absorption valves are arranged in parallel. Therefore, the entire size of this gas meter can be reduced. According to the invention of claim 2, the "hollow valve shaft (3
The axis of b) was set parallel to the front of the gas meter.
However, as long as the gas meter is upright when viewed from the front, the moving axis of the valve element of each pressure fluctuation absorption valve 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. [Invention of Claim 3] The invention of Claim 3 is the same as the invention of Claim 1 or 2, wherein "a shutoff valve device (7) for opening and closing the passage opening (11) from the upstream side is provided". Yes, in this product, the shut-off valve device (7) and the pressure fluctuation absorption valve are
Since they are arranged opposite to each other across the (11), the space occupied by the shutoff valve device (7) and the pressure fluctuation absorbing valve in the gas meter is rationalized, and the pressure fluctuation absorbing device from the shutoff valve device (7) is absorbed. The passage of the gas flow to the valve becomes smooth, and the pressure loss during this period is suppressed. [Invention of Claim 4] The invention of Claim 4 is the same as the invention of Claim 3, in which one of the first and second axial directions of the partition ring (10) having the passage port (11) formed therethrough is provided. Pressure fluctuation absorption valves (A ₁ ) (A ₂ ) are connected in series, and the other side is a partition ring (10).
The valve device unit (U) is constructed by connecting the shutoff valve device (7), which is provided with the valve body part (71) facing the valve seat (14) on the end face of
The gas inflow chamber (C ₁ ) is provided with a horizontal passage part (C ₃ ) continuous to the upstream side of the gas amount measuring chamber (C ₂ ) and open to the open part (8) on the side of the gas meter. The partition ring (10) of the valve device unit (U) is press-fitted into the flow path wall at the downstream end of the passage portion (C ₃ ) in an airtight state, and the opening portion (8) is connected to the shutoff valve device (7). It is closed by the cover plate (73) which is connected to the drive unit (72).

In this structure, the partition ring (10) of the valve device unit (U) is pressed into the downstream end of the horizontal passage portion (C ₃ ) from the opening portion (8) and the shutoff valve device (7) is inserted. Opening part of the horizontal passage part (C ₃ ) by the cover plate (73) connected to the drive part (72)
If (8) is closed, the pressure fluctuation absorption valve and shutoff valve device will be
(7) is installed in the gas meter. This facilitates the assembling of the pressure fluctuation absorbing valve and the shutoff valve device (7) and their assembling to the gas meter.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, as shown in FIGS. 2 and 3, an L-shaped gas inflow chamber (C ₁ ) and a gourd-shaped gas amount measuring chamber (C ₂ ) are provided in a rectangular parallelepiped gas meter (G). , The left and right side of the gas meter in front of the gas inlet chamber (C ₁ ) in the horizontal passage (C ₃ ) on the downstream side, the first pressure fluctuation absorption valve for small flow rate (A ₁ ) and the large flow rate. A valve device unit (U) including a second pressure fluctuation absorption valve (A ₂ ) for use in the engine is inserted and arranged. 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 and the gas amount measuring chamber (C
_A flow rate sensor (S ₁ ) is provided in the central reduced diameter portion of ₂ ).

The valve device unit (U) includes a partition ring (10) which is press-fitted in an airtight state into a reduced diameter portion (C ₄ ) provided at the downstream end of the horizontal passage portion (C ₃ ), and the partition ring (10). First and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) connected downstream of (10), and a shutoff valve device (7) connected upstream of the partition ring (10). Consists of. The inner peripheral area of the partition ring (10) serves as the passage opening (11) described in claim 1.

Next, the first and second pressure fluctuation absorption valves (A ₁ )
Each of (A ₂ ) and the shutoff valve device (7) will be described below. [Regarding the second pressure fluctuation absorption valve (A ₂ )] The second pressure fluctuation absorption valve (A ₂ ) has a hollow valve shaft (3b) open at both ends, which is provided so as to penetrate the center of the passage opening (11). A disc-shaped second valve body (2b) slidably fitted on the hollow valve shaft (3b), and the second valve body (2b) from the outer peripheral portion of the downstream end face of the partition ring (10). ) And a second cylindrical portion (6b) protruding to the outer peripheral region.

The hollow valve shaft (3b) has a passage port (11).
It is supported by a plurality of support rods (32) (32) extending from the peripheral wall toward the center and projects downstream from the center of the partition ring (10). As a result, the axis of the hollow valve shaft (3b) is horizontal and parallel to the front of the gas meter. The hollow valve shaft (3b) is fitted between the valve seat body (4), which will be described later, and the second valve body (2b), which are connected to the downstream end of the hollow valve shaft (3b). A second spring (5b) is interposed, and the second valve body (2b) comes into contact with the valve seat (13) provided on the inner peripheral portion of the downstream end surface of the partition ring (10). There is.

Further, the inner peripheral surface of the second cylindrical portion (6b) is a tapered surface whose diameter increases toward the downstream side, whereby the valve seat (2b) of the second valve body (2b) is formed. The amount of separation from 13) is proportional to the gas passage area between the second valve body (2b) and the second tubular portion (6b). [Regarding First Pressure Fluctuation Absorption Valve (A ₁ )] The first pressure fluctuation absorption valve (A ₁ ) includes a disc-shaped valve seat body (4) protruding from the downstream end of the hollow valve shaft (3b), A first tubular portion (6a) provided on the peripheral edge of the valve seat body (4) and protruding downstream, and a disc-shaped first valve movably accommodated in the first tubular portion (6a). It comprises a body (2a) and a support body (3a) that is connected to the first tubular portion (6a) and supports the first valve body (2a) so as to be movable in the axial direction.

The support body (3a) has a support cylinder at the tip of the support rods (36) (36) protruding downstream from the tip of the first cylinder part (6a).
A disk (35) including (37) is connected in series, and the support tube (37) is positioned coaxially with the first tube portion (6a), and the support tube (37) A shaft portion (23) protruding from the center of the first valve body (2a) is slidably fitted therein. Further, a first spring (5a) for biasing the first valve body (2a) in the valve closing direction is interposed between the disc (35) and the first valve body (2a). .
The inner peripheral surface of the first tubular portion (6a) is formed in the same tapered shape as the second tubular portion (6b), and the valve seat body (4) of the first valve body (2a) is formed.
The amount of separation from is proportional to the gas passage area between the first valve body (2a) and the first tubular portion (6a).

Further, the first pressure fluctuation absorbing valve (A ₁ ) has a valve opening operation flow rate when the first valve body (2a) is opened from the fully closed state,
It is set smaller than that of the second 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. [About shut-off valve device (7)] The shut-off valve device (7) has a well-known configuration and is opposed to the valve seat (14) provided on the inner peripheral portion of the upstream end face of the partition ring (10). With the valve body part (71) that contacts,
It is composed of a drive unit (72) thereof. The tip of the support rods (74) (74) extending from the outer peripheral portion of the upstream end surface of the partition ring (10) to the upstream side is the inner periphery of the lid plate (73) protruding from the drive portion (72). The shutoff valve device (7) and the partition ring (10) are integrated with each other. Furthermore, the driving unit (72), the horizontal passage portion (C ₃₎
Is projected to the outside from an open part (8) that opens to the side of the gas meter, and the outer peripheral part of the lid plate (73) is fixed to the outer peripheral surface of the open part (8) by screwing or the like. As a result, the opening portion (8) is closed.

Next, the actual use and installation of the gas meter having the above construction will be described. With this gas meter (G),
Depending on the flow rate, only the first pressure fluctuation absorption valve (A ₁ ) or both the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) open.
Then, in this valve open state, when the pressure of the gas inflow chamber (C ₁ ) rises, the change in the differential pressure between the primary side and the secondary side thereby causes the valve element to move in the axial direction. Since the valve closing urging force of the spring acts as a movement resistance against the 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 use of gas, the valve body is in a closed state, but the gas pressure in the gas amount measuring chamber (C ₂ ) decreases and the differential pressure between the gas inflow chamber (C ₁ ) becomes The valve opening force due to this differential pressure becomes larger than the biasing force of the spring, resulting in the valve opening state. Further, when the use of gas is stopped, the differential pressure disappears and the valve body closes. Further, when the valve is opened, there is a pressure loss when the gas flow passes through the pressure fluctuation absorption valve,
The pressure in the gas amount measuring chamber (C ₂ ) is slightly lower than that in the gas inflow chamber (C ₁ ).

Further, when the gas meter (G) is installed, the moving axis of the valve body of each pressure fluctuation absorption valve is in a horizontal posture parallel to the front of the gas meter. Even if the valve body is tilted, the horizontal movement of the valve body is ensured. As a result, the relationship between the valve opening force acting on the valve element and the biasing force of the spring in the valve closing direction does not change, so the pressure fluctuation absorbing action is not impaired. The axis of the hollow valve shaft (3b) 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 gas meter is tilted around the moving axis, the pressure fluctuation absorbing action is not impaired.

In this gas meter (G), the first
Since the second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) are provided in series in the axial direction, the cross-sectional area of the gas flow passage in this portion can be reduced. Furthermore, since the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) and the shutoff valve device (7) are arranged opposite to each other with the partition ring (10) interposed therebetween, this gas meter (G) In this, the space occupied by the pressure fluctuation absorbing valve and the shutoff valve device (7) is rationalized. In addition, the passage of the gas flow from the shutoff valve device (7) to the pressure fluctuation absorption valve becomes smooth, and the pressure loss during this period is suppressed.

In order to mount the valve device unit (U) in the gas meter (G), the valve device unit (U) is inserted from the open part (8) of the horizontal passage part (C ₃ ). occlusion Te, dissipate press-fitting the partition ring (10) to the reduced diameter portion (C ₄₎ of the horizontal passage portion (C _3), the opening by the cover plate of the shut-off valve device (7) (73) (8) To do. As a result, the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) and the shutoff valve device (7) are connected to the gas inflow chamber (C
It will be attached to ₁ ). With this, the pressure fluctuation absorbing valve and the shutoff valve device (7) can be easily assembled, and at the same time, they can be easily assembled to the gas meter.

The first and second pressure fluctuation absorption valves (A ₁ ) (A
₂ ) and the structure for mounting the shutoff valve device (7) in the gas inflow chamber (C ₁ ) are not limited to those described above. Further, it goes without saying that the first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ) may be modified to have known structures as long as they have the structures limited in the above claims. Yes.

[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 first and second pressure fluctuation absorption valves (A ₁ ) (A ₂ ).

[Explanation of symbols]

(C ₁ ) ・ ・ ・ Gas inflow chamber (C ₂ ) ・ ・ ・ Gas amount measurement chamber (A ₁ ) ・ ・ ・ First pressure fluctuation absorption valve (A ₂ ) ・ ・ ・ Second pressure fluctuation absorption valve (2a)・ ・ ・ First valve body (2b) ・ ・ ・ Second valve body (3b) ・ ・ ・ Hollow valve shaft (5a) ・ ・ ・ First spring (5b) ・ ・ ・ Second spring (11) ・ ・ ・Communication port (7) ・ ・ ・ Shut-off valve device (10) ・ ・ ・ Partition ring (C ₃ ) ・ ・ ・ Horizontal passage (8) ・ ・ ・ Opening part

Claims (4)

[Claims] 1. A disc-shaped valve element moves in the axial direction according to the pressure difference between the primary side and the secondary side to change the gas passage area, thereby absorbing the pressure fluctuation on the primary side. A gas meter equipped with a pressure fluctuation absorption valve, for a small flow rate in the gas flow path between the gas inlet chamber (C ₁ ) on the primary side and the gas amount measuring chamber (C ₂ ) on the secondary side in the gas meter. No. 1 pressure fluctuation absorption valve (A ₁ )
And a second pressure fluctuation absorption valve (A ₂ ) for large flow rate, and the valve opening flow rate of the first pressure fluctuation absorption valve (A ₁ ) is set to the second pressure fluctuation absorption valve (A ₂ ). In the gas meter set to be smaller than that, the second pressure fluctuation absorption valve (A ₂ ) has a hollow valve shaft (3b) open at both ends, which is provided so as to penetrate the center of the passage port (11), and the hollow valve shaft (3b). It is composed of a second valve body (2b) slidably fitted on the valve shaft (3b) and a second spring (5b) for urging the second valve body (2b) in the valve closing direction. The axis of the valve shaft (3b) is set in a horizontal posture, and the first pressure fluctuation absorption valve (A ₁ ) is the hollow valve shaft (3b).
Valve body (2a) supported coaxially with the hollow valve shaft (3b) on the downstream side of the first valve body (2a) provided at the downstream end of the hollow valve shaft (3b) A gas meter comprising a valve seat body (4) for a vehicle and a first spring (5a) for urging the first valve body (2a) in a valve closing direction. 2. The gas meter according to claim 1, wherein the axis of the hollow valve shaft (3b) is set parallel to the front surface of the gas meter. 3. The gas meter according to claim 1, further comprising a shutoff valve device (7) for opening and closing the passage opening (11) from the upstream side. 4. A partition ring (1) having a passage opening (11) formed therethrough.
The first and second pressure fluctuation absorption valves (A ₁ ) are provided on one side in the axial direction of ( ₀ )
(A ₂ ) is connected in series, and on the other side, a shut-off valve device (7) including a valve body part (71) that is in contact with the valve seat (14) on the end face of the partition ring (10) is connected in series. A horizontal passage that constitutes the valve unit (U) and is connected to the gas inflow chamber (C ₁ ) upstream of the gas amount measuring chamber (C ₂ ) and to the open side (8) of the gas meter. A section (C ₃ ) is provided, and the partition ring (10) of the valve device unit (U) is press-fitted into the flow path wall at the downstream end of the horizontal passage section (C ₃ ) in an airtight state, and the opening section (8) ) Is closed by a cover plate (73) connected to the drive part (72) of the shutoff valve device (7).
Gas meter described in.