JPS61187618A - Apparatus for measuring flow amount - Google Patents

Abstract

PURPOSE:To accurately measure only the steam leakage amount of a trap, by measuring the flow amount of steam from a second orifice. CONSTITUTION:A control valve 11 for regulating the fluid passing area of a first orifice 8 is attached to the ceiling of a measuring container 1 and a handle 12 is operated so that steam is passed corresponding to the heat dissipation quantity between an outlet 3 and a steam trap. An electrode rod 13, of which only the leading end is formed as a continuity member, is almost vertically attached to the measuring container 1 so as to be directed to a second orifice 9 from the ceiling of said container 1. The electrode rod 13 is provided so as to detect the number of air bubbles flowed out from the second orifice 9. Now, when a trap generates the leakage of steam, the water level of an inlet chamber 6 is lowered below the second orifice 9 and air bubbles corresponding only to the leaked steam are flowed out from the orifice 9 to be contacted with the electrode rod 13. A calculation display means 14 utilizes that the electric resistance between the electrode rod 13 and the measuring container 1 changes by the passage of air bubbles and calculates a flow amount from the number of air bubbles to display the same.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application - 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 of this piping system to measure the flow rate of only gas. Specifically, it can be installed on the primary side of a trap in a steam piping system or air piping system to measure the flow rate of steam or air leaking from this trap, or it can be installed on the primary side of equipment that uses fluids to measure the flow rate of this equipment. Used for measuring the amount of steam used, etc.

Conventional technology A device for measuring the amount of steam leakage from a steam trap by attaching it to the primary side of a steam trap is disclosed in Japanese Patent Application Laid-Open No. 58-2.
There is one disclosed in Publication No. 06927. An outline of the structure of this prior art will be explained.

A container is provided that forms an inlet, an outlet, and a chamber in which liquid is stored downward from both ports. A partition wall is provided hanging downward from the upper center of the room. Fixed first orifices and second orifices are provided in the partition wall above and below the location corresponding to the outlet so as to allow gas to flow from the inlet to the outlet. An opening for liquid passage is provided at the lower end of 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 liquid flows at the maximum.

Ltl at the exit! Attach the rod. The number of bubbles flowing out from the second orifice is detected with an electrode rod to determine the steam flow rate.

This measuring device is connected to the primary side of the steam trap.

If the steam trap experiences a vapor leak, the vapor will flow from the inlet to the outlet through the first orifice since the liquid opening is water-sealed. At this time, a pressure difference is generated between the inlet side and the outlet side due to the throttling action of the first 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. Steam flows out of the second orifice in the form of bubbles to the outlet. The number of bubbles is detected with an electrode rod, the steam flow rate is calculated from the number of bubbles, and the steam leakage amount of the steam trap is measured by the sum of the steam flow rate passing through the first orifice.

This method has the problem that only the amount of steam leaking from the steam trap cannot be accurately measured.

That is, the flow rate of steam passing through the first orifice and the second orifice includes not only the amount of steam leaking from the trap but also the amount of heat released between the measuring device and the steam trap. Even if only the steam flow rate from the second orifice is measured, if the diameter of the first orifice is small, part of the heat radiation will pass through the second orifice, and if the diameter of the first orifice is large, part of the amount of steam leakage will pass through the second orifice. portion passes through the first orifice, making it impossible to accurately measure only the amount of steam leakage.

The technical problem of the present invention is to accurately measure only the amount of steam leaking from the trap by measuring the steam flow rate from the second orifice.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is that the inlet and the outlet form a cavity for storing liquid that opens at the top and extends below the outlet. A partition that divides a container into an inlet chamber that communicates the empty space with the inlet and an outlet chamber that communicates with the outlet, and that extends below the outlet opening position and that connects the inlet chamber and the outlet chamber above the outlet opening position. A first orifice adjustably provided to allow the gas to flow through the heat dissipation side on the exit side, a second orifice provided below the opening position of the outlet to communicate the inlet chamber and the exit chamber to allow the gas to flow, and the liquid. The outlet chamber is a frontage for liquid passage with a large passage area and is located below the second orifice so that the water level in the inlet chamber and the outlet chamber are maintained approximately the same even when the flow rate increases to the maximum value. the electrode rod attached to the
A means is provided for calculating and displaying the gas flow rate from the number of bubbles from the second orifice detected by the electrode rod using the correlation between the number of bubbles from the orifice and the gas flow rate passing through the second orifice.

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

The amount of heat dissipated between the steam trap and the steam trap is determined in advance from the type of steam trap and the steam working pressure, and the flow rate of steam passing through the first orifice is adjusted so that the amount of steam corresponding to the amount of heat dissipated flows. When the trap experiences a steam leak, the water level in the inlet chamber of the vessel drops, as in the prior art. The amount of heat dissipated between the measuring device and the trap flows out from the first orifice, and only the amount of steam leaked flows out from the second orifice in the form of bubbles. Therefore, by detecting the number of bubbles flowing out from the second orifice with the electrode rod, only the amount of steam leaking from the steam trap can be accurately measured.

Unique effects The present invention produces the following unique effects.

Since only the amount of steam leaking from the steam trap passes through the second orifice, it is possible to accurately determine whether or not the steam trap is good or not based on the presence or absence of steam passage.

By combining the amount of steam leaking through the second orifice and the amount of heat radiation passing through the first orifice, the amount of steam consumed on the secondary side of the measuring device can be measured.

If the first orifice is fixed as in the conventional technology, and only the amount of heat released is allowed to flow, a large number of measuring devices with different orifice diameters will be required depending on the steam trap model and steam working pressure. .

In the present invention, since the first orifice is adjustable, a single measurement device can be used at any measurement location.

Embodiment An embodiment illustrating a specific example of the above technical means will be described. (
(See FIG. 1) An inlet 2 and an outlet 3 are formed on the same axis in the upper part of a measurement container 1, and a measurement chamber 4 for storing a liquid is formed below the inlet 2 and outlet 3. measurement v
A partition wall 5 is formed in the chamber 4 downward from the ceiling to divide the measurement chamber 4 into an inlet chamber 6 where the inlet 2 is open and an outlet chamber 7 where the outlet 3 is open.

A first orifice 8 is formed by forming a portion bent toward the outlet 3 at an almost right angle above and below the opening position of the outlet 3 of the partition wall 5.
and a second orifice 9. An opening 10 for liquid passage is provided between the lower end of the partition wall 8 and the bottom wall of the measurement container 1. The inlet chamber 6 and the outlet chamber 7 communicate through a first orifice 8 and a second orifice 9 and an opening 10. The opening 10 is formed to have a large passage area so that the water levels in the inlet chamber 6 and the outlet chamber 7 can be maintained substantially the same even when the flow rate of the liquid increases to the maximum value.

A control valve 11 that adjusts the fluid passage area of the first orifice 8 is attached to the ceiling of the measurement container 1 . A scale is engraved on the outer surface of the control valve 11, and the outlet 3 and the steam trap (
(not shown), the handle 12 is operated so as to pass steam according to the amount of heat dissipated between the two.

An electrode rod 13 having only the tip as a conductive member is attached substantially perpendicularly toward the second orifice 9 from the ceiling of the measurement container 1 . The electrode rod 13 is provided to detect the number of bubbles flowing out from the second orifice 9. A second electrode is attached to the electrode rod 13 and the measuring container 1.
A means 14 for storing in advance the correlation between the number of bubbles from the orifice 9 and the amount of vapor passing through the orifice 9 and calculating the amount of gas passing from the number of bubbles detected by the electrode rod 1o, for example, a microcomputer, is connected to an electric wire 15, 16. tie. This means 14
Electricity is passed between the main body 1 and the electrode rod 1o, and the electrical resistance changes as the bubbles pass from the orifice, thereby detecting the number of bubbles coming from the orifice based on the change in electrical resistance.

The device of this example is placed between the steam supply side and the steam trap. When the trap causes steam leakage, the water level in the inlet chamber 6 drops below the second orifice 9 as shown in FIG. touch. The means 14 utilizes the fact that the electrical resistance between the electrode rod 10 and the main body 1 changes due to the passage of the bubbles, and calculates and displays the flow rate from the number of bubbles.

In the above embodiment, the control valve 11 is operated manually, but an automatic control valve is housed and the control valve 11 is manually operated.
It may be possible to automatically adjust the trap type and steam usage pressure by inputting the trap type and steam usage pressure.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a flowmeter measuring device according to an embodiment of the present invention. 1: Measuring container, 2: Inlet, 3: Outlet,
42 measurement room, 5: bulkhead,
6: Inlet chamber, 7: Outlet chamber, 8: First orifice, 9: Second orifice, 10: Liquid opening, 11
: Control valve 13: Electrode rod, 14: Calculation display means

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, and an opening at the outlet. The first orifice is adjustable to connect the inlet chamber and the outlet chamber above the outlet opening position, and to flow gas equivalent to the amount of heat dissipated on the outlet side. A second orifice is provided at the bottom to connect the inlet and outlet chambers and allow gas to flow.The passage area is increased so that the water level in the inlet and outlet chambers remains approximately the same even when the liquid flow rate increases to its maximum value. The liquid passage opening provided below the second orifice, the electrode rod attached to the outlet chamber, and the correlation between the number of bubbles from the second orifice and the gas flow rate through the second orifice are utilized. A flow measuring device consisting of means for calculating and displaying the gas flow rate from the number of bubbles detected by an electrode rod.