JPS62115322A - Flow rate measuring instrument - Google Patents

Abstract

PURPOSE:To measure up to the large flow rate and to widen a measuring range by fitting a reed switch to the outside of a casing and moreover, rotating an impeller in accordance with the flow rate without necessitating a seal means. CONSTITUTION:The casing is formed of a main body 1 and a cover 2 and a measuring chamber 3 is formed therein and an inlet 4 and an outlet 5 which are opened on the upside are formed on the same axis. Further, a partition wall 6 is provided in the measured chamber 3 and inlet and outlet spaces 7 and 8 are divided and between both spaces is communicated by the space 9 for passing a liquid downward. Then, a horizontal wall 10 which is bent to the outlet 5 side almost orthogonally to the upper part from the outlet 5 of the partition wall 6 is provided. An orifice 11 to pass gas in its vertical direction is opened and the impeller 14 to rotate in proportion to the flow rate therefrom is arranged in the downstream space. Then, a permanent magnet 16 is fitted to the impeller 14 and a read switch 18 is fitted to the position close to a locus of the permanent magnet 16 at the outside wall surface of the casing. Then, when the gas just for the consumption volume passes through the orifice 11, the rotation of the impeller 14 is counted by on and off of a switch 18 and the flow rate of the gas is operated and displayed 19.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flow rate measuring device that is attached to a piping system in which both gas and liquid flow, or to fluid-using equipment in this 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. Measurement for condensed steam due to heat dissipation, installed on the primary side of fluid-using equipment,
Used for measuring the amount of steam used by this device, etc.

Conventional technology A device installed on the primary side of a steam trap to determine steam leakage from the steam trap is disclosed in Japanese Patent Laid-Open No. 54-15.
There is one disclosed in Publication No. 73338.

In this method, a measurement chamber is formed with a casing, and an inlet and an outlet opening at the top of the measurement chamber are provided, and a partition wall is provided in the measurement chamber to separate an inlet side space communicating with the inlet and an outlet side space communicating with the outlet. A liquid passage space that communicates the inlet side space and the outlet side space is formed below the partition wall, so that the water level in the inlet side space and the outlet side space can be maintained almost the same even if the liquid flow rate increases to the maximum value. , an orifice for gas passage is opened above the opening position of the outlet of the partition wall, and an electrode is attached horizontally through the casing to a part of the inlet side space below the inlet and above the opening for liquid passage. It is.

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 passage opening is water-sealed.

At this time, a pressure difference is created between the inlet side space and the outlet side space due to the restricting action of the orifice. The pressure on the inlet side is higher than that on the outlet side, and the water level in the inlet side space is lower than the water level in the outlet side space. At this time, the electrode faces the vapor, and the electrical resistance of the electrode increases. The presence or absence of steam leakage is confirmed by this change in electrical resistance.

Problems to be solved by the present invention In this case, it is difficult to determine whether the water level in the inlet side space is above or below the electrode.
That is, only the presence or absence of steam leakage can be determined, but the amount of leakage cannot be determined.

Therefore, the technical problem of the present invention is to make it possible to measure the flow rate of gas.

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems is to form a measurement chamber and an inlet and an outlet opening at the upper part of the measurement chamber in a casing. A partition wall is provided in the partition wall to separate an inlet side space communicating with the inlet and an outlet side space communicating with the outlet, and a space for liquid passage communicating between the inlet side space and the outlet side space is formed below the partition wall. An orifice for gas passage is opened above the opening position of the outlet of the wall, an impeller that rotates at a rotation speed proportional to the flow rate from the orifice is placed in the downstream space, and a permanent magnet is attached to the impeller. A reed switch is attached to the outer wall near the rotation locus of the permanent magnet, and a means is provided to count the on/off times of the reed switch and calculate and display the flow rate.

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

When gas is consumed on the outlet side, the water level at the inlet of the container decreases as in the prior art, and the amount of gas consumed passes through the orifice and flows out to the outlet side.

Due to the gas passing through the orifice, it is placed in the outlet side space (
), the impeller rotates in proportion to its passing position. A reed switch turns on and off each time a permanent stone attached to the impeller passes. The gas flow rate can be measured by counting the on/off times and calculating the flow rate from the correlation between the gas flow rate passing through the orifice and the rotation speed of the impeller.

Unique effects The present invention produces the following unique effects.

In a conventional detection device in which an electrode is attached through a casing for detection, a sealing means is required between the casing and the electrode. In the present invention, since the reed switch is mounted outside the casing for detection, no sealing means is required.

In a device that counts the number of bubbles flowing out of an orifice, as disclosed in Japanese Patent Application Laid-Open No. 58-206927, when the flow rate increases, the bubbles become continuous and cannot be measured. In the present invention, even if the flow rate increases, the impeller rotates accordingly, so it is possible to measure up to a large flow rate and the measurement range is widened.

Example An example showing a specific example of the above technical means will be explained.

First Embodiment (See FIG. 1) A casing is formed by the main body 1 and M2, and a measurement chamber 3 and an inlet 4 and an outlet 5 opening at the upper part of the measurement chamber 3 are formed coaxially within the casing. A partition wall 6 is installed downward from the top of the measurement chamber 3.
The measuring chamber 3 is divided into an inlet side space 7 communicating with the inlet 4 and an outlet side space 8 communicating with the outlet 5. The inlet side space 7 and the outlet side space 8 are a liquid passage space 9 below the partition wall 6.
communicate through. The liquid passage space 9 is formed to have a large passage area so that the water levels in the inlet side space 7 and the outlet side space 8 can be maintained almost the same even when the flow rate of the liquid increases to the maximum value.

Above the opening position of the outlet 5 of the partition wall 6, a horizontal wall 10 bent at a right angle toward the outlet 3 is provided, and an orifice 11 for passing gas in the vertical direction is opened. A support shaft 12 is screwed to the partition wall 6 and erected.

An impeller 14 is attached to the support shaft 12 via a sliding plate 13. Reference number @15 is a nut that holds the sliding plate.

The impeller 14 has four blades shaped like a propeller. A permanent magnet 16 is attached to the top surface of one blade,
A weight 17 is attached to the blade on the opposite side to offset the weight of the permanent magnet 16 and balance the blade.

A reed switch 18 is mounted on the lid 2 at a position close to the rotation locus of the permanent magnet 16. reed switch 1
8 is connected to a counter and a flow rate calculation display integrally indicated by reference numeral 19.

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 side space 7 drops below the second orifice 9, and steam corresponding to the amount of steam leakage flows out from the orifice 9, causing the impeller 14 to rotate. Every time the permanent magnet 17 attached to the impeller 14 passes, the reed switch 18 is turned on and off. This on/off is counted by a calculation display 19, and the flow rate is calculated from the correlation between the flow rate of gas passing through the orifice and the rotational speed of the impeller and is displayed.

Second Embodiment (See Figure 2) This embodiment is different from the first embodiment shown in Figure 1 in the orifice and impeller, so only this part will be explained, and the other components are the same. Reference numbers are given and detailed explanations are omitted.

The orifice 21 can be seen laterally in the vertical part of the partition wall 6 above the horizontal wall 10.

The impeller 22 has a disk shape, and a large number of thin plate-like blades are attached to the outer periphery of the impeller.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a flow rate measuring device according to an embodiment of the present invention;
The figure is a sectional view of another embodiment. 1: Main body, 2: Lid, 3: Measurement chamber, 4: Inlet, 5: Outlet, 6: Partition wall, 7: Inlet side space, 8: Outlet side space, 9: Space for liquid passage, 10/21 Niorifice,

Claims (1)

[Claims] 1. Forming a measurement chamber with a casing, and an inlet and an outlet opening at the top of the measurement chamber, and providing a partition wall in the measurement chamber to separate it into an inlet side space communicating with the inlet and an outlet side space communicating with the outlet,
A space for liquid passage communicating between the inlet side space and the outlet side space is formed below the partition wall, an orifice for gas passage is opened above the opening position of the outlet of the partition wall, and a flow rate from the orifice is formed in the downstream space. An impeller that rotates at a rotation speed proportional to A flow meter equipped with a means to calculate and display the flow rate.