JPH0227222A - Flow rate measuring apparatus - Google Patents

Abstract

PURPOSE:To enable accurate measurement of a condenser flow rate and a steam flow rate by arranging hot-wire type flow rate measuring elements in a space for passage of gas and a space for passage for liquid respectively. CONSTITUTION:Hot-wire type flow rate measuring elements 9 and 10 are arranged respectively in a space 7 for passage of gas and a space 8 for passage of liquid having both ends thereof connected to a power source through an output terminal. A temperature sensor 12 is mounted to correct a temperature due to a stream pressure at the top of an inlet 2. With such an arrangement, a condenser at the inlet 2 enters a measuring chamber 5 and flows to a drain space 6 through the space 8 to measure a flow rate of a condenser passing through the space 8 with the element 10. In case a float 11 suffers a steam leak, steam of the measuring chamber 5 leaks out to an outlet 3 from a space 6 passing through the space 7. A flow rate of the steam passing through the space 7 is measured with the element 9, thereby enabling the determining of a correct condenser flow rate and steam flow rate.

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.

BACKGROUND OF THE INVENTION Therefore, the applicant has developed an apparatus for measuring the flow rate of condensate without causing pressure changes. The principle is that a casing forms the inlet and outlet of the fluid, a partition wall is erected inside the casing, a measurement chamber is formed on the population side, and a drainage space is formed on the exit side, and a space is created that communicates the measurement chamber and the drainage space. is formed above the partition wall, holes such as circular holes or vertical slits are made in the partition wall, and a valve means for automatically discharging condensate such as a steam trap is placed downstream 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, since the measurement chamber and the drainage space communicate above the partition wall, a valve such as a steam trap is installed on the downstream side to automatically discharge condensate without letting steam escape. Therefore, both the measuring chamber and the drainage space have the same pressure as the steam on the inlet side.Therefore, the condensate passes through the partition wall without being re-evaporated.

Since there is a predetermined relationship between the liquid level in the measurement chamber and the flow rate passing through the drain hole, the invention of the driftwood method for condensate water by determining this relationship in advance, measuring the liquid level, and passing through the drain hole solved the problem. In this case, the liquid level in the measurement chamber will ripple due to the inflowing fluid, so
Unable to measure accurate condensate flow rate. In addition, if a valve means such as a steam trap causes steam leakage,
The amount of steam leakage cannot be measured.

Therefore, the technical problem of the present invention is to enable accurate condensate flow rate and steam flow rate to be determined.

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problems is to form a fluid inlet and an outlet in a casing, and erect a partition wall in the casing. There is a measurement room on the entrance side,
A drainage space is formed on the exit side, a space for gas passage is formed above the opening position of the inlet of the partition wall, and a space for liquid passage is formed below the opening position of the exit of the partition wall, thereby forming a measurement chamber and a drainage space. A hot wire type flow rate measuring element is arranged in each of the gas passage space and the liquid passage space.

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

Valve means for automatically discharging condensate, such as a steam trap, is arranged in the drainage space on the secondary side of the outlet or on the primary side of the outlet. The pressure is the same upstream of this valve means, ie before and after the partition wall. The condensate at the inlet enters the measuring chamber and flows out through the liquid passage space into the drainage space. When a hot wire flow rate measuring element is energized and maintained in a self-heating state, the temperature drops due to the passage of fluid and its resistance value decreases. This temperature change indicates the amount of heat dissipated by the hot wire, and by utilizing the fact that this is proportional to the flow rate of the fluid passing through, the flow rate of the fluid is detected from the change in the resistance value or the change in the terminal voltage. A hot wire flow rate measurement element placed in the liquid passage space measures the flow rate of condensate passing through it.

If the valve means is leaking steam, the steam in the measurement chamber flows into the drainage space through the gas passage space at the top of the partition wall. Arranged in the space for gas passage! I! A linear flow measurement element can measure the flow rate of steam passing through it.

Since the flow rate is measured using a hot wire type flow rate measurement element, the flow rate can be measured without being affected by ripples.

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

As described above, according to the present invention, accurate condensate flow rate and steam flow rate can be determined.

Furthermore, in the past, 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, steam flow rate and condensate flow rate can be measured simultaneously with one instrument. be able to.

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

An inlet 2 is formed in the upper part of the casing 1, and an outlet 3 is formed in the lower part. A partition wall 4 is formed in the casing 1 to form a measurement chamber 5 on the inlet 2 side and a drainage space 6 on the outlet 3 side. Partition wall 4
A gas passage space 7 is provided above the opening position of the inlet 2,
A liquid passage space 8 is opened below the opening position of the outlet 3 to communicate the measurement chamber 5 and the drainage space 6.

A hot wire flow rate measurement element 9 is placed in the gas passage space 7, and a hot wire flow rate measurement element 10 is placed in the liquid passage space 8. Each measuring element 9.10 is connected at both ends to a power supply via an output terminal.

A float 11 serving as a drain valve for opening and closing the outlet 3 is housed in the drain space 6 in a free state. The float 11 ascends and descends with the liquid level to open and close the outlet 3 and discharge only condensate.

A temperature sensor 12 is attached to the upper part of the inlet 2.

The temperature sensor 12 is for temperature correction based on steam pressure.

The condensate at the inlet 2 enters the measuring chamber 5 and flows through the liquid passage space 8 to the drainage space 6. The flow rate of condensate passing through this space 8 is measured by a hot wire flow rate measuring element 10. float 11
If steam leakage occurs, the steam in the probe 5 passes through the gas passage space 7 and flows out from the drainage space 6 to the outlet 3. The flow rate of steam passing through this space 7 is measured by a hot wire type flow rate measuring element 9.

In the above embodiment, since the drain valve means is disposed within the casing on the primary side of the outlet, there is no need to provide separate piping for the drain valve means and the flow rate measuring device.

[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: Partition wall 5: Measuring element 6: Drainage space 7: Space for gas passage 8: Space for liquid passage 9.10:
Hot wire flow rate measuring element 10 heat vJl measurement and measurement tke 5 slots

Claims (1)

[Claims] 1. Form the inlet and outlet of the fluid with the casing, set up a partition wall inside the casing, form a measurement chamber on the inlet side, and a drainage space on the outlet side, above the opening position of the inlet of the partition wall. A gas passage space is formed with a liquid passage space below the opening position of the outlet of the partition wall to connect the measurement chamber and the drainage space, and a hot wire flow rate measuring element is installed in each of the gas passage space and the liquid passage space. A flow rate measuring device with a