JP2012026964A - Gas pressure measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability in measurement of gas pressure and to facilitate maintenance.SOLUTION: The gas pressure measuring apparatus includes: a first closed container 2 for storing liquid; an overflow pipe 11 which can discharge liquid by overflow from an aperture of one end part to set and maintain the maximum height of a liquid level of liquid stored in the first container 2; a liquid supply path 7 for supplying liquid to the first container 2; a second container 12 for storing liquid, in which the other end part of the overflow pipe 11 is arranged; a gas conduit 4 branched from a gas pipe 3 and connected to a portion upper than one end part of the overflow pipe 11 in the first container 2; a communicating part 6 of which the one end side is communicated into the liquid 5 stored in the first container 2 and the other end side is opened to atmosphere; and a liquid level height detection device 13 for detecting a position of a liquid level on the other end side of the communicating part 6. In the gas pressure measuring apparatus, a difference between the liquid level height detected by the liquid level height detection device 13 and the liquid level height of the liquid 5 stored in the first container 2 can be measured as a detected gas pressure of the gas conduit 3.

Description

  The present invention relates to a gas pressure measuring device such as a gas pipe or a gas container.

  Conventionally, as a gas pressure measuring device, in addition to a mechanical pressure gauge such as a Bourdon tube gauge or a diaphragm gauge, a U-shaped tube having one end connected to a branch pipe of a gas conduit and the other end opened to the atmosphere There was a liquid column manometer (Fig. 4) formed by (a well-known conventional technique).

As the conventional gas pressure measuring device described above, the mechanical pressure gauge may be deteriorated with time, and there is a concern about reliability.
The liquid column manometer shown in FIG. 4 has a simple structure and high reliability over time, but measures the height of the liquid level at both ends in the U-shaped tube, and calculates the difference between the measured values. There is a problem that it takes time to measure because the liquid level at both ends of the liquid fluctuates depending on the gas pressure, and the other end of the U-shaped tube communicates with the atmosphere, Since one end side is connected to the gas conduit, there is a problem that it is difficult to incorporate a device that automatically measures the height of the water surface in an easy-to-maintain state.

  Accordingly, an object of the present invention is to provide a gas pressure measuring device that solves the above problems, has a reliable gas pressure measurement, and is easy to maintain.

  According to a first characteristic configuration of the present invention, a sealed first container storing liquid is provided, and the liquid is discharged by overflow from one end opening so as to set and maintain the maximum stored liquid level in the first container. An overflow pipe that enables discharge is provided, a liquid replenishment passage that supplies liquid to the first container is provided, and the other end of the overflow pipe is disposed in the stored liquid of the second container that stores the liquid. Is connected to the upper end of the overflow pipe in the first container, and is provided with a communication part having one end communicating with the stored liquid in the first container and having the other end open to the atmosphere. A liquid level detector for detecting the position of the liquid level is provided on the other end side of the unit, and the difference between the liquid level detected by the liquid level detector and the liquid level of the stored liquid in the first container is determined. Detection of the gas conduit There is where you have to be measured as a scan pressure.

According to the first characteristic configuration of the present invention, the overflow pipe capable of discharging the liquid by overflow from the opening at one end is provided, the other end is disposed in the stored liquid in the second container, and the gas conduit is provided. However, since it is connected in communication above the one end of the overflow pipe in the sealed first container, the space above the one end of the overflow pipe is maintained in an airtight state and has the same pressure as the gas conduit.
In the communicating portion in which one end side is communicated with the stored liquid in the first container and the other end side is opened to the atmosphere, the height of the liquid level fluctuates depending on the gas pressure of the gas conduit. Is measured by a liquid level detector.
The liquid level in the first container is maintained with the maximum liquid level set by the liquid replenishment path and the overflow pipe. For this reason, the gas level always varies in the liquid level in the first container. Even so, it remains constant.
Therefore, by measuring the difference between the liquid level height detected by the liquid level detector and the liquid level height of the stored liquid in the first container as the detected gas pressure of the gas conduit, The gas pressure in the gas conduit can be easily measured only by detection with the height detector.
In addition, since the other end side of the communicating part is open to the atmosphere, the liquid level position can be easily set by installing the liquid level detecting device on the other end side of the communicating part. It can be detected and maintained easily.
As a result, a gas pressure measuring device with high reliability and easy maintenance can be provided. In addition, in gas containers such as biogas generation tanks and gas tanks, if the gas pressure is excessively reduced, the gas container may be damaged, but if the gas pressure measuring device of the present invention is connected, the pressure will be below a certain level In this case, air is sucked from the other end side of the communication portion, and the gas container can be prevented from being damaged.

  The second characteristic configuration of the present invention is that the second container is provided with an overflow portion for holding the maximum liquid level of the stored liquid.

According to the second characteristic configuration of the present invention, the height from the other end portion of the overflow pipe disposed in the stored liquid of the second container to the overflow portion is the highest of the gas conduit connected in communication with the space. If the height is set so as to receive the same pressure as the set gas pressure, the gas exceeding the set gas pressure is discharged from the other end of the overflow pipe into the stored liquid in the second container. Can be maintained within a certain level.
And since the maximum liquid level of the stored liquid in the second container is held by the overflow part, the liquid pressure at the other end of the overflow pipe is constant, so that the set gas pressure is always constant. Maintained.
Accordingly, the maximum gas pressure in the gas conduit can be accurately maintained, and the gas pressure in the space in the first container communicating with the branch pipe is also reflected with high accuracy in the liquid level in the communicating portion, thereby increasing the high pressure. Accurate gas pressure measurement is possible.

  A third characteristic configuration of the present invention is that a flow meter for detecting the amount of liquid to be supplied is provided for the liquid supply path.

According to the third characteristic configuration of the present invention, the liquid supplied from the liquid replenishment path can be managed by the flow meter, and the liquid level in the first container can always be maintained at the maximum height that overflows by the overflow pipe. .
Therefore, the gas pressure measurement can be maintained with high accuracy.

Schematic longitudinal sectional view described in the embodiment Schematic longitudinal sectional view of another embodiment Schematic longitudinal sectional view of another embodiment Schematic longitudinal sectional view of a conventional manometer

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the parts indicated by the same reference numerals as in the conventional example indicate the same or corresponding parts.

  As shown in FIG. 1, the present invention provides a sealed first container 2 that stores water as a liquid, and opens an opening at one end to set and maintain the maximum stored liquid level in the first container 2. An overflow pipe 11 is provided that allows the liquid to be discharged by overflow, and a liquid replenishment passage 7 for supplying the liquid to the first container 2 is provided, and the overflow pipe 11 is provided in the stored liquid 5 of the second container 12 that stores the liquid. The other end 10 is arranged, and one end is connected to the gas supply source, and the gas conduit 4 branched from the gas pipe 3 that connects the other end to the gas supply destination is connected to one end of the overflow pipe 11 in the first container 2. The communication pipe 6 is connected to the upper space 1, and one end side communicates with the stored liquid 5 in the first container 2, and the other end side is opened to the atmosphere. Liquid level detection to detect position A gas pressure measuring device provided with a device 13 and capable of measuring the difference between the liquid level height detected by the liquid level detector 13 and the liquid level height of the stored liquid 5 in the first container 2 as the detected gas pressure of the gas pipe 3. Is configured.

  The second container 12 is provided with an overflow portion 14 that maintains the maximum liquid level of the stored liquid, and the gas in the space 1 is discharged to the maximum pressure of the gas pipe 3 through the overflow pipe 11. The difference between the height of the overflow portion 14 and the position of the other end portion 10 of the overflow pipe 11 is set so that the corresponding water pressure acts on the other end portion 10 of the overflow pipe 11.

  A flow meter 15 is attached to the water supply pipe 8 so that the flow rate of the liquid supplied to the second container 12 can be managed.

  The liquid stored in the first container 2 and the second container 12 is mainly water, and may be mixed with an antifreeze composed of a polyhydric alcohol such as ethylene glycol or propylene glycol in cold regions or at low temperatures. In addition, when the gas pressure in the gas pipe 3 is high, a liquid having a large specific gravity such as mercury may be used.

[Another embodiment]
Other embodiments will be described below.

<1> In addition to the water supply pipe 8, as the liquid supply path 7, if the liquid is supplied below the liquid level of the stored liquid 5 in the first container 2, The liquid supply path 7 may be formed.
<2> The overflow part 14 of the second container 12 is configured to drain from the side surface of the container as shown in FIGS. 2 and 3 even if it is configured to discharge from the bottom surface of the container as shown in FIG. It may be. Further, as shown in FIG. 2, a circulation path for returning the liquid discharged from the overflow portion 14 to the liquid supply path 7 via the pump 16 may be formed.
<3> An alarm may be issued when the liquid level detected by the liquid level detector 13 is higher than a predetermined upper limit or lower than a predetermined lower limit.

  In addition, as mentioned above, although the code | symbol was written in order to make contrast with drawing convenient, this invention is not limited to the structure of an accompanying drawing by this entry. In addition, it goes without saying that the present invention can be carried out in various modes without departing from the gist of the present invention.

The gas pressure measuring device of the present invention can be used for measuring the gas pressure of gas conduits of other chemical plants, in addition to being used for measuring the gas pressure of gas conduits of city gas, biogas, and other fuel gases. .
Further, it can be directly connected to a biogas production tank or various gas storage tanks and used for gas pressure measurement.

DESCRIPTION OF SYMBOLS 1 Space 2 1st container 3 Gas pipe 4 Gas conduit 5 Storage liquid 6 Communication part 7 Liquid supply path 9 One end part 10 Other end part 11 Overflow pipe 12 Second container 13 Liquid level height detection apparatus 14 Overflow part 15 Flowmeter

Claims (3)

Providing a sealed first container for storing liquid;
In order to set and maintain the maximum stored liquid level in the first container, an overflow pipe is provided that allows the liquid to be discharged by overflow from one end opening;
Providing a liquid supply path for supplying liquid to the first container;
Placing the other end of the overflow pipe in the stored liquid of the second container storing the liquid;
A gas conduit is connected in communication above one end of the overflow pipe in the first container;
The one end side communicates with the stored liquid in the first container, and the other end side is provided with a communication portion opened to the atmosphere,
A liquid level detection device for detecting the position of the liquid level is provided on the other end side of the communication part, and the liquid level height detected by the liquid level detection device and the liquid level height of the stored liquid in the first container A gas pressure measuring device capable of measuring a difference as a detected gas pressure of the gas conduit.   The gas pressure measuring device according to claim 1, wherein an overflow part for setting a maximum liquid level height of the stored liquid is provided in the second container.   The gas pressure measuring device according to claim 1, wherein a flow meter for detecting the amount of liquid to be supplied is provided for the liquid supply path.

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