JPS5830620A - Flowmeter - Google Patents

Abstract

PURPOSE:To obtain the flowmeter having no movable part, by forming vortex by a turnaround part, detecting the frequency of its vibration, and measuring the flow rate. CONSTITUTION:A case main body 1 is constituted by a base 2 and a cover 3. An oscillating chamber 4 comprising a concave part is provided in the base 2. An input port 5 is provided at one end of the chamber and an output port 6 is provided at the other end. The opening part of the upper surface of said oscillating chamber 4 is covered by a cover 3 and hermetically sealed. The turn-back part 7 comprising a crescent shaped protruded part is provided at the central part of the oscillating chamber 4. A sensor 9 which counts the frequency of the vibration generated by the vortex is provided in the vicinity of the turn-back part 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flow meter that measures a flow rate by detecting the frequency of vibrations caused by vortex flow of fluid.

T-smeters, water meters, etc. are known as devices for measuring the flow rate of fluids such as gas and water.In the case of f-smeters, a metering membrane is moved in a reciprocating manner by the pressure of the circulating gas, and its blades It counts the number of revolutions of the car and instructs the total flow rate of each fluid.

However, all of the above-mentioned flow rate needles are structurally complex, and the assembly work is troublesome and expensive.

Therefore, the present applicant has already applied for a flow rate needle which measures the fluid flow rate by counting the frequency of a vibrating piece that vibrates due to the flow of fluid. The flow resistance is large due to the vibration of the
In addition, there is the disadvantage that the bearing part that pivotally supports the vibrating piece is subject to significant wear. This invention was made in view of the above-mentioned circumstances, and its purpose is to form a vortex flow by the reversing part, and to generate vibrations. The purpose of this invention is to provide a flow meter with no moving parts, which measures the flow rate by detecting the frequency of 1 in Figure 1 is a case body, which is composed of a pace 2 and a cover 1. This pace 2 is provided with an oscillation chamber 4 consisting of a concave portion, and an inflow port 5 is provided at one end of the oscillation chamber 4.
, an outlet e is provided at the other end. The planar shape of the oscillation chamber 4 is fan-shaped and gradually widens from the upper stream port 5 toward the outlet #, and the outlet C side is formed in an arc shape. The upper opening of this oscillation chamber 4 is covered with a cover 3 and hermetically sealed. Furthermore, an inversion part 2 consisting of a crescent-shaped protrusion is provided in the center of the oscillation chamber 4 with its arcuate concave surface 7a facing the inflow port 5, and the fluid flowing in from the inflow port 5 is directed to the arcuate concave surface. At 1a, the direction is changed to the right or left. Further, a branch passage a*mttb branching left and right is provided on the side of the outlet C from the reversing part 1, and these branch passages a*mttb are arranged to merge at the outlet 6.

(9) A sensor t# is provided near the reversing section 1 to count the frequency of vibrations caused by the eddy current. This sensor 9 is a known strain gauge, hot wire type, or
An electrical detection means such as a thermistor is used to count the frequency proportional to the flow rate, convert this Norse number into a flow rate, and instruct a counter or the like to integrate the flow rate.

Next, the operation of the flow rate needle configured as described above will be explained based on FIGS. Entrance 5
When the fluid flows in from (A)K, a part of the fluid hits the inversion part 1 in the oscillation chamber 4), and the fluid reaches the arcuate concave surface FaK.
along the arrow a. Therefore, a clockwise vortex is generated at point A in the oscillation chamber 4, pushing the main flow toward the outlet 6 to the right. Therefore, the fluid flows out from the outlet 6 via the branch passage 8a as shown in CB), but the left and right balance is maintained again (as shown in QK, the fluid collides with the inversion part IK. It turns in the direction indicated by the arrow along the arcuate concave surface 1a of the section 7, and a counterclockwise vortex is generated at four points in the oscillation chamber 4.Therefore, as shown in (6), the main flow toward the outlet is turned to the left. direction to guide the fluid to the branch passage 8b.

In this way, the fluid flowing from the inlet 5 to the outlet gK generates vortices alternately at point A and four points from the reversing part FK, and the frequency caused by the vibration at this time is counted by the sensor 9, and the frequency of the vibration is counted by the sensor 9. The fluid flow rate can be measured by converting it into a flow rate and instructing a counter or the like to integrate it.

In the above embodiment, an electrical detection means such as a strain gauge, a hot wire type, or a thermistor is used to detect the frequency of the eddy current generated in the vibration chamber 4, but the present invention is not limited to this, and optical detection means or It may be an ultrasonic detection means, as long as it can detect a frequency proportional to the flow rate, count the number of pulses, and issue an integration instruction.

As explained above, the present invention includes: (1) a reversing section that reverses the fluid flowing in from the inlet into the oscillation chamber and alternately pushes the main flow from the side to form a vortex; and (1) a sensor that detects the frequency of vibrations caused by the vortex. The feature is that the flow rate is measured by detecting the flow rate. Therefore, the gas,
It is possible to measure the flow rate of water, etc., and has the effect of having little flow resistance and fewer failures.

[Brief explanation of drawings]

The drawing is a turtle showing one embodiment of this invention, so Figure 1 is a partially cut-away, whole surface view. 12 (A) to Q)) are schematic plan views for explaining the action. 1...Case body, 4-oscillation chamber, 5-inlet, 6...
- Outlet, 1... Reversing part, 9... Sensor.

Claims (1)

[Claims] A case body, an oscillation chamber provided in the case body and having an inlet at one end and an outlet at the other end, and an oscillation chamber provided at the outlet side of the oscillation chamber that reverses the fluid flowing in from the inlet and creates a main stream. What is claimed is: 1. A flow rate needle comprising: an inversion section that alternately presses the vortex from the lateral direction to form a vortex, and a sensor that measures the flow rate by detecting the frequency of vibration generated by the vortex.