JPH0514838B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flow rate 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. .

Measuring the flow rate of steam flowing through steam pipes can determine the amount of steam consumed by steam-using equipment, providing data for improving the heating efficiency of steam-using equipment. However, since the specific volume of steam changes greatly when it is subjected to pressure fluctuations, it has been extremely difficult to measure its flow rate.

2. Description of the Related Art A device for measuring the flow rate of condensate without causing pressure changes is disclosed in Japanese Utility Model Application Publication No. 197399/1983. This uses a casing to form an inlet and an outlet for the fluid, a wall built into the casing, a measurement chamber on the inlet side, a drainage space on the outlet side, and a space that communicates the measurement chamber with the drainage space. Form above the side wall, make a side hole such as a circular hole or a vertically long slit in the side wall, and arrange a valve means such as a steam trap to automatically discharge condensate on the downstream side of the device. The liquid level in the upstream space of the wall is detected to determine the flow rate of condensate passing through the drain hole.

In this case, the measurement chamber and the drainage space communicate above the side wall, and a valve is installed downstream from the steam trap to automatically discharge condensate without letting steam escape. , both the measurement chamber and the drainage space have the same pressure as the steam on the inlet side. Therefore, condensate passes through the drain hole without re-evaporation.

Since there is a predetermined relationship between the liquid level in the measurement chamber and the flow rate passing through the drain hole, this relationship is determined in advance, the liquid level is measured, and the flow rate of condensate passing through the drain hole is determined.

Problems to be Solved by the Present Invention In this case, since condensate passes through the drain hole without being re-evaporated, an accurate condensate flow rate can be determined. However, if a valve means such as a steam trap causes steam leakage, the amount of steam leakage cannot be measured.

A technical object of the present invention is to enable accurate determination of the condensate flow rate and steam flow rate even if a steam leak occurs in a valve means such as a steam trap.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form the inlet and outlet of steam and condensate in a casing, and to erect a wall inside the casing. A measurement chamber is formed on the entrance side and a drainage space is formed on the exit side, and a space is formed above the side wall that connects the measurement chamber and the drainage space and through which steam flows, and a circular hole or a vertical slit is formed in the side wall. A means is provided to detect the liquid level in the measurement chamber, and a means is provided to calculate the condensate flow rate from the relationship between the detected liquid level and the amount of condensate flowing through the hole. At the same time, means for detecting the force of the jet of steam flowing through the space above the wall in the drainage space is provided, and means for calculating the steam flow rate from the relationship between the force of the detected jet and the amount of steam flowing through the space. was installed to measure both the flow rate of condensate and steam.

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

The flow measuring device according to the invention is installed upstream of a valve means for automatically discharging condensate, such as a steam trap. As long as it is installed upstream of this valve means, the pressure is the same before and after the flow measuring device. The condensate at the inlet enters the measuring chamber, collects there, flows out through the drain hole into the drainage space, and flows downstream from the outlet. Since the measurement chamber and the drainage space communicate through the space above the sidewall, the pressure is maintained at the same level, and condensate does not re-evaporate when it passes through the sidewall. The flow rate of condensate passing through the drain hole is determined by the opening area of the drain hole and the water head from the drain hole to the liquid level. If the amount of condensate flowing into the measurement chamber is greater than the amount passing through the opening, the liquid level in the measurement chamber will rise, if it is less, it will fall, and if they are the same, it will remain constant. Therefore, by detecting the liquid level in the measurement chamber, the condensate flow rate can be measured from the relationship between this liquid level and the opening area of the drain hole.

If the valve means is causing steam leakage, the steam in the measurement chamber will flow into the drainage space through the space above the side wall, so by detecting the jet caused by this steam flow in the drainage space, the force and flow rate of the jet can be determined. From the relationship, the steam flow rate can be measured.

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

Conventionally, the steam flow rate and condensate flow rate were measured separately using a steam flow meter and a condensate flow meter, but according to the present invention, it is possible to simultaneously measure the steam flow rate and condensate flow rate with one instrument. can.

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

Inlet 2 at the top of casing 1, outlet 3 at the bottom
form. A wall 4 is erected from the bottom of the casing 1. A measurement chamber 5 is provided on the entrance 2 side by a side wall 4.
A drainage space 6 is formed on the exit 3 side, and the measurement chamber 5 and the drainage space 6 communicate through a space 7 above the side wall 4. A circular opening 8 is made in the lower part of the opening wall 4.

A plurality of electrodes 9a, 9b, 9c, 9d, .

A collision plate 10 is arranged in the drainage space 6. Collision plate 1
A connecting rod 12 connected to a potentiometer 11 is attached to the upper surface of 0, and the lower surface is biased upward by a coil spring 13. A communication path 14 is opened around the collision plate 10.

Inlet 2 and outlet 3 are connected between the steam supply and the steam trap. The pressure is the same before and after the flow measuring device.

The condensate at the inlet 2 enters the measurement chamber 5 and accumulates there.
It flows out into the drainage space 6 through the drain hole 8 and flows away from the outlet 3 downstream. Since the measurement chamber 5 and the drainage space 6 communicate with the space 7 above the drain wall 4 through the communication passage 14, the pressure is maintained at the same level, and when the condensate passes through the drain hole 8, it does not evaporate again.

The flow rate of condensate passing through the drain hole 8 is determined by the opening area of the drain hole 8 and the water head from the drain hole 8 to the liquid level. The amount of condensate flowing into the measurement chamber 5 is
If the amount is greater than the amount passing through the liquid, the liquid level in the measurement chamber 5 will rise, if it is less, it will fall, and if the amount is the same, it will remain constant. Therefore, the liquid level in the measurement chamber 5 is controlled by the electrodes 9a, 9b,
By detecting at 9c, 9d, .

If the steam trap is causing steam leakage, the steam in the measurement chamber 5 will leak into the space 7 above the side wall 4.
It collides with the collision plate 10 through. The collision plate 10 is displaced downward against the elastic force of the coil spring 13 by the jet generated by the steam flow. The larger the amount of steam leakage, the greater the force of the jet, and the collision plate 1
0 is displaced further downward. Therefore, by detecting the position of the collision plate with the potentiometer 11,
Steam flow rate can be measured.

The flow rate measuring device requires parts that calculate and display the flow rate from the detected liquid level with the electrode and the detected position with the potentiometer, but these can be made using well-known technology. Explanation omitted.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a flow rate measuring device according to an embodiment of the present invention. 1...Casing, 2...Inlet, 3...Outlet,
4... Seki wall, 5... Measurement room, 6... Drainage space,
8...Seki hole, 9a, 9b, 9c, 9d...9n...
...Electrode, 10... Collision plate, 11... Potentiometer.

Claims (1)

[Claims] 1 Form the inlet and outlet of steam and condensate with a casing, erect a wall inside the casing, form a measurement chamber on the inlet side and a drainage space on the outlet side, and connect the measurement chamber and the drainage space to prevent steam A space is formed above the side wall where water flows, and a side hole is made in the side wall, such as a circular hole or a vertically elongated slit, through which condensate flows.
A means for detecting the liquid level in the measurement chamber is provided, a means is provided for calculating the flow rate of condensate from the relationship between the detected liquid level and the amount of condensate flowing through the drain hole, and a means is provided to calculate the flow rate of condensate through the space above the drain wall. A condensate and steam flow rate measuring device, comprising: means for detecting the force of a jet of steam flow; and means for calculating a steam flow rate from the relationship between the detected force of the jet flow and the amount of steam flowing through the space.