JPS5855717A - Measuring device for flow rate - Google Patents

Abstract

PURPOSE:To permit easy handling of a titled device on site and measurement of the minute flow rate of gas by mounting an electrode bar approximately perpendicularly in an inlet chamber and using a means which calculates the flow rate of the gas from the water level detected by utilizing the correlations between the water level value in the inlet chamber and the flow rate of an orifice gas. CONSTITUTION:A measuring device is disposed between a steam supply side and a steam trap. When leakage of steam arises in the trap, the water level in the inlet chamber decreases. A calculating means such as mincrocomputer detects the water level value in the inlet chamber by utilizing the change in the electric resistance between an electrode bar and a body with the decrease in said water level. The calculating means calculates the flow rate of steam from the correlations between the water level value and the steam passing through an orifice and displays the same in a display or with a printer or the like according to need. Thus the accurate flow rate of the steam is measured by detecting the water level value in the inlet chamber with the electrode bar.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow rate measuring device that is attached to a piping system in which gas and liquid flow together, or to fluid-using equipment in any piping system, to measure the flow rate of only gas. Specifically, it is installed on the primary side of a steam piping system or air piping system, such as a trap, to measure the flow rate of steam or air leaking from this trap, and is installed on the steam piping system. It is used to measure the amount of condensed steam due to heat radiation, and when attached to the primary side of equipment that uses fluid, to measure the amount of gas used by this equipment.

As a prior art of the present invention, Japanese Patent Application Laid-Open No. 54-157333
There is something disclosed in the publication No. An outline of the structure of this prior art will be explained. An inlet, an outlet, and a container extending downward from both ends to form a chamber for storing liquid is provided. A partition wall is provided hanging downward from the upper center of the room. An orifice is provided in the bulkhead above a location corresponding to the outlet to allow gas to flow from the inlet to the outlet. An opening for liquid passage is provided under the partition wall with a passage area such that the water level difference before and after the partition wall is maintained approximately the same even if the flow rate of the liquid is maximum.

Two electrodes are mounted laterally on the wall of the chamber on the entry 20 side of the septum, located below the inlet and above the opening for the liquid. A means is provided to energize the electrode and detect and display when the electrode is submerged in water and when it is above the water surface by a change in electrical resistance.

The above structure has the following problems. The inlet and outlet are connected between the steam supply side and the steam trap. If the steam trap experiences a vapor leak, the vapor will flow from the inlet to the outlet through the orifice since the liquid opening is water-sealed. At this time, a pressure difference occurs between the inlet side and the outlet side due to the throttling action of the orifice. The pressure on the inlet side is higher than that on the outlet side, and the water level in the chamber on the inlet side is lower than the water level in the chamber on the outlet side.

At this time, the electrodes face the vapor, and the electrical resistance between the electrodes increases. The presence or absence of steam leakage is confirmed by this change in electrical resistance. With this device, it is only possible to determine whether the water level in the chamber on the inlet side is above or below the electrode. This only tells you whether the leakage of steam is above or below a certain level. If vapor leakage occurs below the location corresponding to the electrode, it will not be obvious. The exact amount of steam leaking is unknown.

The technical problem of this W is to measure the water level on the inlet side of the orifice.

The present invention consists of the following configuration. A chamber with an inlet and an outlet opening at the top and extending below the outlet for storing liquid is formed inside the container. This chamber is divided into an entrance chamber leading to the entrance and an exit chamber leading to the exit.

A partition wall is provided within the container. The bulkhead extends below the outlet opening location. An orifice is provided above the opening position of the outlet to allow gas to flow through the inlet chamber and the outlet chamber.

An opening/port for liquid passage with a large passage area is provided so that the water level in the inlet chamber and the outlet chamber are kept approximately the same even when the flow rate of the liquid increases to the maximum value. This opening is provided below the opening position of the outlet. Attach the electrode rod approximately perpendicularly to the entrance chamber. Means is provided for calculating the gas flow rate from the water level value detected by the electrode rod using the correlation between the water level value in the inlet chamber and the gas flow rate passing through the orifice. The operation of the above configuration is as follows.

When there is a consumption of gas on the outlet side, the water level in the inlet chamber of the container decreases, as in the prior art. This water level value is detected with an electrode rod. The correlation between this water level value and the flow rate passing through the orifice is determined in advance, and the gas flow rate is determined from the detected water level value. Therefore, since the water level value in the inlet chamber is detected, the accurate flow rate of gas can be measured. - Next, the present invention will be explained based on the embodiments illustrated in FIGS. 1 and 2. The container is formed of a bowl-shaped main body 1 and a lid 7 attached to cover the upper opening of the main body 1. The container forms a downwardly extending chamber 6 for storing liquid. The inlet 2 and outlet 3 are formed by tubular parts 4 and 5 extending coaxially from the top of the container to the left and right. The inlet 2 and outlet 3 open at the top of the chamber 6. In room 6, there is a distance from the ceiling! 8 is provided hanging approximately vertically. This partition wall 8 connects the chamber 6 to an inlet chamber 6a that opens the inlet 2 and an outlet 3.
It is divided into an outlet chamber 6b with an opening. The opening position of the outlet 3 - communicates with the inlet chamber 6a and the outlet chamber 6b, and allows gas to pass therethrough.
A refit 15 is provided on the partition wall 8. An opening 9 for liquid passage is provided at the bottom of the gap W8. The opening 9 is formed to have a large passage area so that the water levels in the inlet chamber 6a and the outlet chamber 6b can be maintained substantially the same even when the flow rate of the liquid increases to the maximum value. Electrode rod 1 on lid 7
0, and this electrode rod 10 is installed substantially perpendicularly from the ceiling to the bottom of the entrance chamber 6a. In addition to the electrode rod 10, a reference electrode rod 11 and a pressure sensor 13 are attached to the lid 7. Electrode chamber 10 is arranged to detect the water level above the lower end of septum 18. The electrode rod 11 is provided so that the detection part is located only in the part that is always below the water surface. The detection unit 12 determines the energization length in advance. Electrode rod 11, pressure sensor 1
3 may be provided facing either the entrance chamber (3a1 or the exit chamber 6b).

A means 14, for example a microcomputer, is provided outside the container to store in advance the correlation between the water position in the inlet chamber 6a and the amount of gas passing through the orifice 15, and to calculate the amount of gas passing from the water position detected by the electrode rod 10.

This means 14 conducts electricity between the main body 1 and the electrode rod 10, and the electrical resistance changes according to the water level in the inlet chamber 2, thereby detecting the water level value in the inlet chamber 2 by the change in electrical resistance. The reference electrode rod 11 prevents the electrical resistance from changing depending on water quality and causing measurement errors.

That is, if the length of the detection part 12 is known in advance, the electrical resistance between the detection part 12 and the main body 1 is measured, and the electrical resistance detected by the electrode rod 10 is corrected, an accurate water level value can be determined. .

The pressure sensor 13 is used when the specific weight changes depending on the pressure, such as steam.

16, 17, 18, and 19 are means 14 and electrode rods 10 and 11
, shows an electric wire connecting the pressure sensor 13 and the main body 1.

The operation of the embodiment will now be explained. The device of this embodiment is placed between the steam supply side and the steam trap 20, and is used to measure the amount of steam leaking from the trap 20.

When the trap 20 causes a steam leak, the water level in the inlet chamber 6a decreases as shown in FIG. The means 14 is an electrode rod 10
The water level value in the inlet chamber 6a is detected by utilizing the fact that the electrical resistance between the main body 1 and the main body 1 changes due to this lowering of the water level. Further, the means 14 calculates the flow rate of steam from the correlation between the water level value and the steam passing through the orifice 15, and displays it on a printer or display, etc., as necessary.

Therefore, since the water level value in the inlet chamber 6it is detected by the electrode rod 10, an accurate steam flow rate can be measured.

In this embodiment, the pressure of the steam is detected by the pressure sensor 13', and the flow rate calculated by the means 14 is corrected by τ°.

That is, the specific weight of steam changes depending on the pressure, and by integrating the specific weight corresponding to the detected pressure with the weight calculated in means 14, the mass flow rate of the leaked steam can be determined. . Further, a temperature sensor may be used in place of the pressure sensor 13, and the specific weight may be determined from the temperature.

Water produced by condensing steam often contains dissolved substances, and these dissolved substances change electrical resistance. In this embodiment, the electric resistance between the detection part 12 of the reference electrode rod 11 and the main body 1 is determined, and the water level value of the inlet chamber 6a is determined from the electric resistance between the electrode rod 10 and the main body 1 based on this electric resistance. I can do it. Therefore, measurement errors due to differences in water quality can be avoided.

When detecting the water level value of the inlet chamber 6a, the main body 1 is used,
Only one electrode rod is required. Therefore, the number of electrode rods can be reduced.

By applying a waveform alternating voltage between the electrode rod 10 and the main body 1, changes in electrical resistance due to adhesion of metal ions deposited from the electrode rod 10 or the main body 1 can be prevented, and accurate measurements can be made at all times.

Next, the embodiment shown in FIGS. 3 and 4 will be described. No orifice is provided in the partition walls 38 within the containers 31 and 32. An inlet chamber 39a and an outlet chamber 39tl are provided outside the containers 31 and 32.
A passageway 40 is provided to communicate with each other.

This passage 40 opens above the opening of the outlet 36.

An orifice plate 42 forming an orifice 41 is attached in the middle of this passage 40. The electrode rod 37 is attached by hanging downward into the entrance chamber 39a from the lid 23 forming the container.

In this embodiment, the orifice 41 is formed outside the containers 31 and 32, and can be replaced without disassembling the containers 31 and 32.

Therefore, the range of use can be expanded by using an orifice plate provided with orifices of different diameters depending on various pressures.

The present invention has the following specific effectiveness %=4 degrees. It has a structure in which the water level in the inlet chamber (low -1) does not occur when liquid passes through, but only when gas passes through.

Therefore, it is possible to measure only the flow rate of gas in a piping system where gas and liquid drip.

The flow rate of gas is detected by the water level in the inlet chamber fJ'. The water level in the inlet chamber is generated even if the gas flow rate is minute. Therefore, minute gas 8! Et can be measured.

The device of the present invention only needs to be connected to the pipe at the inlet and outlet at the measurement site. Additionally, this device consists of a container and a means for calculating the flow rate and is easily portable.

Therefore, it can be easily handled in the field.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a container portion of a flow rate measuring device according to an embodiment of the present invention, FIG. 2 is a plan view of the container shown in FIG. 1 with the lid removed, and FIG. A cross-sectional view of a container of an example,
FIG. 4 is a plan view of the container shown in FIG. 3 with the lid removed. 1.7.31.32: Container, 2: Entrance, 3.36:
Exit, 6: Indoor, 6a/39a: Entrance room,
6b -39b: Exit”!, 8/38 bulkhead,
9: Liquid opening, 1o: Electrode rod, 11: Reference electrode rod, 13: Pressure sensor, 14: Calculation means,
15.4.1 Niorifice, 4o: Passage. Patent applicant Co., Ltd. Chiinil, Bui procedural amendment (method) 1. Indication of the case Patent application 1983-157633+j 2. Name of the invention Flow rate measuring device 3. Person making the amendment Relationship with the case Patent application No. Chodakuuchi'j -＋ '・Ichi■tsuAddress 1, +2-3, Uchisaiwai-cho, Chiyoda-ku, Tokyo @81, 8th floor, Hibiya Kokusai Hibiya Kokusai Building) Ward name: TELUP Co., Ltd. 1 4. Date of amendment order: February 4, 1980 5. Amendment Subject application and specification 6, content of amendment (1) Engraving of the letter (no change in content) (2) Engraving of specification (no change in content) 7, list of attached documents (1) Application for correction 1 copy (2) 1 miscellaneous book for corrections

Claims (1)

[Claims] 1. A container with an inlet and an outlet opening at the top and extending below the outlet to form a chamber for storing liquid; a partition wall that divides the chamber into an inlet chamber communicating with the inlet and an outlet chamber communicating with the outlet; an opening at the outlet; An orifice that extends below the opening position of the outlet, and an orifice installed above the opening position of the outlet to communicate the inlet and outlet chambers to allow gas to flow, and to maintain the water level of the inlet and outlet chambers even if the liquid flow rate increases to its maximum value. An opening for liquid passage with a large passage area so as to maintain approximately the same area below the exit opening, an electrode rod installed approximately perpendicular to the entrance chamber, and the water level value and orifice of the entrance chamber. A flow rate measuring device consisting of a means for calculating the flow rate of gas from the water level value detected by an electrode rod using the correlation of the flow rate of gas passing through.