JPS6166928A - Area flowmeter - Google Patents

Abstract

PURPOSE:To measure a flow rate with high precision over a wide flow rate range by linking plural flow meters which differ in measurement range with one another and providing a float in the flow passage of each flow meter. CONSTITUTION:The flow meters 3a, 3b, 3c, and 3d which differ in flow rate measurement range are provided and upper ends of the respective flow meters are connected to lower ends of next flow meters successively so that fluid flows. The tube diameter of the flow meters are increased from 3a-3d and the measurement range of 3a is made larger than that of 3d. Then, fluid is flowed from, the flow meter 3a. Then, floats 4a and 4b in tubes stop at upper ends of the respective pipes, and a float 4d stops at a lower end, and a float 4c is positioned in the center part. Thus, the different flow meters are linked together and flow rates are easily measured with high precision over a wide range.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is an area type method that measures the flow rate of a fluid to be measured from the position of a float that guides the fluid to be measured into an internal flow path and is moved up and down by the fluid. Regarding flowmeters.

<Prior Art> As a conventional example of such an area type flowmeter, for example, Japanese Patent Application No. 1982-246666 (filed by the applicant on December 28, 1982, '6, application publication number (Application publication number not yet determined) There is an "area flowmeter" described in the specification. This area type flow meter includes a first member in which a groove is formed that has a rectangular cross section and a depth that gradually increases in the longitudinal direction, and an internal flow path that is attached to the first member and cooperates with the groove. a cylindrical float that moves up and down in the longitudinal direction within the internal flow path; and a cylindrical float that is inserted into the inlet of the fluid to be measured guided into the internal flow path and determines the lower limit of the operating range of the float. a second spring that is inserted into an inlet for discharging the fluid to be measured from the internal flow path and determines an upper limit of the operating range of the float; It is designed to measure the flow rate.

However, in the conventional example described above, the measurable flow rate range is generally narrow, and in order to measure the flow rate over a wide flow rate range, it is necessary to prepare a plurality of flow meters and use them while replacing them. A device that can measure the flow rate with high accuracy over a wide range of flow rates has the disadvantage that the glass tube forming the flow meter is long, resulting in a high price.

Moreover, when the glass tubes and the like are long, they become complicated to handle, and larger installations require more space.

<Object of the Invention> The present invention has been made in view of the above drawbacks, and an object thereof is to provide a small area flow meter that can measure flow rate with high precision over a wide flow rate range.

<Summary of the Invention> The present invention provides an area flowmeter that includes a plurality of flowmeters with different measurable ranges, and an internal flow path of each flowmeter that has a rectangular cross section and a depth that increases gradually in the length direction. A plurality of grooves are formed respectively, a plurality of cylindrical floats are moved up and down in the longitudinal direction within these internal flow paths, and a plurality of connection pipes are provided to connect the plurality of grooves in series, The flow rate of the fluid to be measured is read from a flow meter in which the cylindrical float is located near the middle of the measurable range of the plurality of flow meters.

<Example> Hereinafter, the present invention will be described in detail using the drawings. 1st
4 to 4 are explanatory diagrams of the configuration of the embodiment of the present invention, in which FIG. 1 is a front view, FIG. 2 is a rear view, FIG. The figure shows a BB' cross-sectional view. In addition, 1 is a main body having rectangular cutout windows 2a to 2d, 51 to 5d are flow meters attached to these cutout windows 2a to 2dK, and 4a to 4d are internal flow paths of these meters 5a to 5d. Cylindrical floats 5a to 5dij that move up and down in the longitudinal direction, respectively, these floats 4
Upper limit spring regulating each upper limit of movement of a to 4d, 5
'a to 5'd are lower limit springs that regulate the lower limits of the movements of these floats 4 to 4d, and 6 is a flow meter 3a.
A connection pipe 6h communicates the outlet of the flow meter 3b with the inlet of the flow meter 3b, and 6h is the connection pipe that connects the outlet of the flow meter 3b with the inlet of the flow meter 5c.
A connection pipe that communicates the inlet of the 6eVi flow meter 5c and an inlet of the flow meter 5d, 7 is an inlet that leads the fluid to be measured to the inlet of the flow meter 5a, and 7b is an outlet of the flow meter 3d. The outlet ports 1 and 8 for guiding the fluid to be measured are adhesives that bond the vibro 6C to a predetermined portion of the main body 8 in a gas-tight structure.

Note that the adhesive 8 may be replaced by welding or the like. In addition, the flow meters 5a to 3d have rectangular cross sections of 0 to 1.
001114/'m111, 0-500m1hln
,' ~2t/nll! l rO~101/n1ln.

In the embodiment of the present invention having such a configuration, for example, a fluid to be measured with a flow rate of 1500 mA/min is introduced into the inlet 7a.
When introduced from the inlet of the flow meter 3a → the outlet of the flow meter 5a → the connecting vibro a → the inlet of the flow meter 5b → the outlet of the flow meter 5b → the connecting vibro b → the inlet of the flow meter 5c → the flow meter 3c Outlet → Connection vibro c → Inlet of flow meter 5d → Flow meter 3d
Flows in the outlet flow path of and is discharged to the outside from the outlet lower d. Therefore, depending on the fluid to be measured flowing in each of the flow meters 3a to 3d, each flow 4a to 4d is at a position Kl shown in FIG. 1, for example.

That is, 70, 4m and 4b are swung to the upper limit of the measurement range υ, the float 411 is near the middle of the measurement range, and the float 4d is Ki near the lower limit of the measurement range. Therefore, by reading the scale of the flow meter 3c, the flow rate of the fluid to be measured can be known more accurately than by reading the scales of any of the other flow meters 3m, 3b, and 3o.

<Effects of the Invention> According to the embodiments of the present invention as described in detail above, the flow meter can be replaced for each measurement in a configuration in which a plurality of flow meters with different measurable ranges are installed. It has the advantage that the flow rate of the fluid to be measured can be measured with high precision over an extremely wide flow rate range. In addition, compared to conventional curved systems that measure flow rates over a wide range using a flow meter made of a single long glass tube, it is more compact because it combines multiple flow meters, and requires less space to install. It's done. Furthermore, it has the advantage that it is less expensive and easier to handle than the case where the same function is obtained by using a plurality of independent flow meters alone.

[Brief explanation of the drawing]

FIGS. 1 to 4 are explanatory diagrams of the configuration of an embodiment of the present invention.

Claims (2)

[Claims] (1) Multiple flow meters with different measurable ranges,
a plurality of grooves each having a rectangular cross section and a depth gradually increasing in the longitudinal direction forming an internal flow path of each of the flow meters; and a plurality of cylindrical floats that move up and down in the internal flow paths respectively in the longitudinal direction. and a plurality of connecting pipes that connect the plurality of grooves in series, and the cylindrical float is located near the middle of the measurable range of the plurality of flowmeters. An area type flow meter that is characterized by reading the flow rate of a fluid. (2) The area type flow meter according to claim (1), wherein the plurality of flow meters include four flow meters.