JPS62212522A - Apparatus for measuring flow rate - Google Patents

Abstract

PURPOSE:To make it possible to accurately determine the flow rate of condensed water and the consumption of steam, by operating the flow rate of condensed water passing through a weir hole from the liquid level detected by a liquid level detection means when an opening and closing valve is closed. CONSTITUTION:When a stem trap generates leakage, steam passes a passing hole 28 to flow to an outlet 18 and the liquid level of a measuring chamber 22 is lowered below that in the side of the outlet 18. Float 58 falls along with the lowering in the liquid level and an operation rod 64 displaces simultaneously by the actions of magnets 62, 66. The displacement of the operation rod 64 is converted to an electric signal by a potentiometer 52 and the liquid level of the measuring chamber 22 is converted to an electric signal to be taken out. The leakage amount of steam is operated from the the correlation between said liquid level and the passing flow amount of the passing hole 28. Next, an opening and closing valve 30 is brought to an open 28. Next, an opening and closing valve 30 is brought to an open state to convert the displacement of the float 58 floating and falling along with the change in the liquid level of the upstream space of a weir wall member 36 to an electric signal by the potentiometer 52 through the operation rod 64. Subsequently, the flow amount of condensed water is determined from the correlation with the flow rate passing through a weir hole 42.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flow meter measuring device for measuring the amount of condensate flowing through steam pipes such as steam transport pipes and condensate pipes that lead out condensate generated in steam-using equipment. Regarding.

By measuring the flow rate of steam flowing through steam pipes, it is possible to determine the amount of steam consumed by steam-using equipment, and data for improving the heating efficiency of steam-using equipment can be obtained. However, since the specific volume of steam changes greatly when it is subjected to pressure fluctuations, it is extremely difficult to measure its flow [1].

BACKGROUND OF THE INVENTION Therefore, the applicant has developed an apparatus for measuring the flow R of condensate without causing pressure changes. The principle is to place a side wall in the condensate flow path, connect the upstream space and downstream space of the wall with the upper part of the wall, and insert circular holes, vertical slits, etc. in the side wall. A pipe hole is opened, and a valve means such as a steam trap for automatically discharging condensate is placed on the downstream side of the device, and the liquid level in the upstream space of the pipe wall is detected to control the flow rate of condensate passing through the pipe hole. It is something to seek.

In this case, since the upstream space and the downstream space of the side wall communicate above the side wall, there is also a valve on the downstream side that automatically discharges condensate without letting gas such as steam I/lap escape. Because it is attached, both the upstream and downstream spaces of the wall have the same pressure as the steam in the upstream space. Therefore, condensate passes through the drain hole without re-evaporation.

Since there is a predetermined relationship between the liquid level in the upstream space of the shedding wall and the flow passing through the shedding hole, this relationship is determined in advance, the liquid level is measured, and the condensate flowing through the shedding hole is measured. Find the flow rate.

This condensate flow No. 5 is understood as the steam ω consumed by the steam-using equipment.

*Problem to be solved by the invention In this case, the condensate passes through the drain hole without being re-evaporated, so it is possible to obtain an accurate condensate flow rate. However, if a valve means such as a steam trap causes steam leakage, the amount of steam leakage cannot be measured. Not.

The technical problem of the present invention is to enable accurate determination of the condensate flow rate and steam consumption even if a valve means such as a steam trap causes steam leakage.

Means for solving the problem A casing is used to form a fluid inlet and an outlet, and a partition wall is provided inside the casing to form a measurement chamber on the inlet side and a drainage space on the outlet side. A through hole is formed above the opening position of the outlet of the partition wall to communicate the drainage space with the drain space below the partition wall, and an on-off valve that opens and closes the through hole is formed in the casing/! - Attach it through the heat, and before measurement, divide the side wall with 32 cm to separate the upper and downstream spaces, connect the upstream space and the downstream space above the C wall, and make circular holes and vertically long holes in the side wall. A drain hole such as a slit is opened, a valve means for automatically discharging water at the outlet is arranged, a means for detecting the liquid level in the upstream space is provided, and the liquid level detecting means detects the liquid when the on-off valve is opened. The amount of steam leaking through the opening is calculated from the opening, and the flow rate of condensate passing through the opening is calculated from the liquid level detected by the liquid level detecting means when the on-off valve is closed.

action The operation of the above technical means is as follows.

For measurement, first, open the on-off valve.

If the valve means does not cause steam leakage, the liquid level will be the same on the inlet side, that is, the measuring chamber and the outlet side, but if leakage occurs,
The steam passes through the hole and flows to the outlet, causing the liquid level in the measurement chamber to drop toward the outlet. This drop in the liquid level is detected by the liquid level detection means, and the amount of steam leakage is calculated from the correlation with the flow rate passing through the through hole. Next, close the on-off valve and proceed as before.
The water level on the downstream side of the lateral wall is detected by a liquid level detection means, and the flow rate of condensate is determined from the correlation with the flow rate passing through the lateral hole. Therefore, if there is no leakage (valve means), the flow rate of condensate is considered the steam consumption amount, and if there is a leakage, the sum of the flow rate of condensate and the amount of steam leakage is considered the steam consumption amount. Can be measured accurately.

Effect of the invention The present invention produces the following unique effects.

Since the amount of steam consumed by steam-using equipment can be accurately measured, data can be obtained to improve the heating efficiency of steam-using equipment and to understand the relationship between productivity and steam consumption.

Since steam leaks can be detected, leak-free valve means can be used to reduce steam usage, resulting in energy savings.

Embodiment An embodiment illustrating a specific example of the above technical means will be described (see FIG. 1).

A casing is constructed by attaching the plug 14 to the main body 12 with bolts (not shown). An inlet 16 and an outlet 18 are coaxially formed in one part of the casing. the law of nature.

- A partition wall 20 is formed inside the sink, and a measurement chamber 22 is formed on the inlet 16 side and a drainage space 24 is formed on the outlet 18 side. The measurement chamber 22 and the drainage space 24 are connected through an opening 26 between the lower end of the partition wall 20 and the bottom wall of the main body 12 .

The inlet 16 is located above the opening position of the outlet 18 of the partition wall 20.
A through hole 28 communicating with the outlet 18 is opened.

An on-off valve 30 is attached facing the through hole 28. Open/close valve 3
0, the main body 12 is placed through L'X, and the handle 3 is placed externally.
Turn 2 to the right. An O-ring packing 34 is interposed between the main body 12 and the in-moving parts to keep them confidential.

A cup-shaped wall member 36 is placed inside the measurement chamber 22.

The inside and upper part of the side wall member 36 constitutes an upstream space 38,
The outer periphery and the lower part form a downstream space 40 . A passage hole 42 is opened in the peripheral wall of the passage wall member 36. The sekihole 42 is a vertically elongated V-shaped slit whose width is narrower toward the bottom and wider toward the top. The upper part of the passage hole 42 forms an upper communication opening between the upstream space 38 and the downstream space 40.

Therefore, when the on-off valve 30 is closed, the inlet 16 communicates with the upstream space 38 of the measurement chamber 22 through the cylindrical screen 44, and the outlet 18 passes through the drain hole 42, the downstream space 40, the opening 2G, and the raised drainage space 24. communicate with. Open/close valve 3
In addition to this, when the valve 0 is open, the °C1 inlet 16 also communicates with the outlet 18 through the through hole 28.

A steam trap (not shown) is installed at outlet 18.

A heat insulating plate 46 and support members 48, 50 are attached on top of the lid 14, and a potentiometer 52 is placed in the center of the support member 50. Remove protective cap 54 over potentiometer 52. Illustrations of internal parts such as electrical wiring and connection terminals are omitted.

A thin tube 56 extends downwardly from the potentiometer 52, through the lid 14 in a sealed manner, to the lower central portion of the side wall member 36. Around it is a spherical hollow float 58
Place. A tube 60 is attached to the center of the float 58 and is slidably fitted into the tube 56. A magnet 62 is attached to the tube 60 of the float 58, and a magnet 66 is attached to the actuating rod 64 of the potentiometer 52, which is housed within the tube 56.

In the measurement, first, the on-off valve 30 is opened. If the steam trap does not cause a steam leak, inlet 16
The liquid level is the same on both sides, that is, the measurement chamber 22 and the outlet 18 side, but if a leak occurs, steam passes through the through hole 28 and reaches the outlet 1.
8, and the liquid level in the measurement chamber 22 drops to the outlet 18 side. As the liquid level decreases, the float 58 descends, and the actuating rod 64 is simultaneously displaced by the action of the magnets 62,66. The displacement of the actuating rod is then converted into an electrical signal by a potentiometer 52. In this way, the liquid level in the measurement chamber 22 is converted into an electrical signal and taken out. Steam leakage is estimated from the correlation between this liquid level and the flow rate through the through hole 28.

Next, the on-off valve 30 is closed, and the displacement of the float 58, which ascends and descends with changes in the liquid level in the upstream space 38 of the side wall member 36, is actuated. The flow rate of condensate is determined from the correlation with the flow rate passing through the opening 42.

The flow rate measuring device requires parts that calculate and display the flow rate from the detected liquid level, but since these can be manufactured using well-known techniques, their explanation is omitted.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flow rate measuring device according to an embodiment of the present invention.

Claims (1)

[Claims] 1. Form the inlet and outlet of the fluid with the casing, provide a partition wall inside the casing, form a measurement chamber on the inlet side and a drainage space on the exit side, and connect the measurement chamber and drainage space below the partition wall. A through hole that communicates the inlet and outlet is formed above the opening position of the outlet of the partition wall, an on-off valve that opens and closes the through hole is installed through the casing, and a side wall is provided inside the measurement chamber. , Separate the upstream space and downstream space, connect the upstream space and downstream space above the side wall, make a side hole such as a circular hole or a vertical slit in the side wall, and automatically discharge condensate to the outlet. A valve means is arranged, a means for detecting the liquid level in the upstream space is provided, and when the on-off valve is opened, the amount of steam leaking through the through hole is calculated from the liquid level detected by the liquid level detection means, and the amount of steam leaking through the through hole is calculated when the on-off valve is opened. A flow rate measuring device that calculates the flow rate of condensate passing through a drain hole based on the liquid level detected by the liquid level detecting means.