KR102355949B1 - Ultrasonic Flow Meter for Small Pipe Diameter - Google Patents

Abstract

The ultrasonic sensor does not install an ultrasonic reflection plate in the measuring pipe of the small-diameter ultrasonic flowmeter and forms a structure in which the ultrasonic sensor responds directly to the measuring pipe. We present a small-diameter ultrasonic flowmeter that is widely used for mass-use flowmeters such as water meters by designing so that there is no structure in the bent part to improve the productivity of the manufacturing and processing process.

Description

Ultrasonic Flow Meter for Small Pipe Diameter

The present invention uses the characteristic that the propagation speed of ultrasonic waves propagating inside a fluid when a fluid flows through a pipe becomes faster when it is in the same direction as the fluid flow direction, i.e., slows down when it is in the same direction as the fluid flow direction, so that the ultrasonic waves in the forward and reverse directions It relates to an ultrasonic flowmeter that calculates a flow rate using the propagation time difference of

A sensor block with a built-in ultrasonic transceiver that has a function to generate ultrasonic waves in the fluid flowing in the pipeline and to detect the ultrasonic waves that are propagating as a method of measuring the amount of fluid flowing in a pipe such as a constant water supply pipe or a sewage pipe gas pipe Hereinafter referred to as an ultrasonic sensor, a pair of ultrasonic sensors are installed in the measuring pipe through which the fluid flows to correspond to the inlet and outlet, so that the ultrasonic sensor on one side generates ultrasonic waves, and when the opposite sensors receive it, the reverse and forward directions of the fluid flow A method of measuring the flow rate by measuring the propagation time of each and using the time difference (Δt) to find the flow rate of the fluid and multiplying it with the cross-sectional area of the pipe is used. In particular, in large-sized pipes used for waterworks pipes with a sufficiently large diameter, a pair of ultrasonic sensors is installed on the outer wall of the pipe so that the direction of ultrasonic waves and the flow direction of the fluid are inclined. Large-diameter ultrasonic flowmeters are widely used commercially because they emit large ultrasonic waves so that they can be detected by counter ultrasonic sensors at large distances. In the method of installing the sensor inclined, it is difficult to secure the propagation line of the ultrasonic wave, and since a small battery power is used, there is a limitation in the emitted energy of the ultrasonic wave, so a structure that minimizes the measurement distance is required. As a way to secure a propagation line in a small-diameter ultrasonic flowmeter, install the ultrasonic sensor straight on both ends of a straight pipe to make a measuring pipe. The ultrasonic flowmeter of the form 1-A of FIG. 1 in which the central axis of the measuring pipe and the central axis connecting the inflow and outflow pipe is inclined in a form in which the outlet pipe is formed as a curved part in the .10), and the Korean Patent (Registration No.: 1016225660000 2016.05.13) shows an ultrasonic flowmeter in which the central axis of the measuring pipe and the central axis connecting the inflow and outflow pipe are parallel. The structure of the flowmeter made of casting or injection of synthetic resins is composed of a measuring pipe, an inlet pipe, and a measuring pipe and an outlet pipe, which are integrally formed with a curved pipe, so there is no productivity in manufacturing and processing. It is difficult to find its application in the type.

The small-diameter ultrasonic flowmeter as shown in 1-B of FIG. 1 has a structure that secures the propagation line of ultrasonic waves in the pipe of the measuring pipe and enables flow rate measurement. It shows an ultrasonic flowmeter that measures the flow rate by securing an ultrasonic wave propagation line in the measuring pipe by having two ultrasonic reflecting plates that change the propagation direction of This is necessary, and the reflector is installed in a direction perpendicular to the flow of the fluid to obstruct the flow of the fluid, and there are problems such as a decrease in measurement performance due to contamination of the reflector when used for a long period of time.

In order to solve the problems in the small-diameter ultrasonic flowmeter as described above, a structure in which the propagation line of the ultrasonic wave is directly piped without installing an ultrasonic reflection plate in the measuring pipe of the ultrasonic flowmeter for the small-diameter ultrasonic flowmeter, which reduces productivity in the manufacturing process. We present a small-diameter ultrasonic flowmeter widely applied to mass-use flowmeters such as water meters by removing the bends of the pipeline between the inlet pipe and the measuring pipe and between the measuring pipe and the outlet pipe to improve the productivity of the manufacturing and processing process. .

In order to achieve the above object, the ultrasonic flowmeter of the present invention is designed to have an inlet pipe part, a measuring pipe part, and an outflow pipe part, respectively, and to have a structure in which there is no shape of a bent pipe in each part. In the case of actual use, the inflow pipe and the outflow pipe part are the same, so they are shared by any one production, and each part is assembled by flange coupling by forming a flange on the coupling surface.

The ultrasonic flowmeter for small diameter of the present invention is designed to be separated so that the structure of the inflow pipe part, the measurement pipe part, and the outflow pipe part is simple and easy to manufacture and process, and the corresponding ultrasonic sensor is a structure in which the corresponding ultrasonic sensor is directly connected in the measuring pipe. It can improve the measurement sensitivity compared to the ultrasonic flowmeter that refracts and reflects the propagation line of ultrasonic waves in two stages by using it. It is possible to implement an electronic ultrasonic flowmeter that is competitive in terms of price and performance by improving the precision of measurement by replacing the vane type structure.

1 is an example of a conventional ultrasonic flow meter. In 1-A, the inlet pipe 21 has a bent part in the measurement pipe 11, and the outflow pipe 31 in the measuring pipe 11 has a bent part. Reference numerals 24 and 34 denote an ultrasonic flowmeter installed in a straight tube at both ends of the measuring pipe, and 1-B is a structural diagram of an ultrasonic flowmeter using ultrasonic reflectors 100 and 101 .
Figure 2 is a structure in which the inlet pipe section 20, the measuring pipe section 10, and the outlet pipe section 30 are separately manufactured and combined in 2-A, wherein the measuring pipe section 10 is point symmetrical at the midpoint of the central axis. It is a perspective view of an example of the ultrasonic flowmeter of the present invention of the structure, and 2-B is a cross-sectional view thereof.
In FIG. 3, 3-A is a diagram in which the fluid flow pipe of the ultrasonic flow meter according to the present invention is installed horizontally, and 3-B is a functional block diagram included with an example of the manufactured form of the ultrasonic flow meter according to the present invention.

A specific embodiment for carrying out the present invention will be described in detail with reference to FIGS. 2 and 3 . In the example of the ultrasonic flowmeter of the present invention in FIG. 2, the measuring pipe part 10 is point symmetric at the midpoint of its central axis, and the inlet part 20, the measuring pipe part 10, and the outlet part 30 are separately manufactured. It shows an ultrasonic flowmeter with a structure that is combined with each other. The inlet pipe part 20 is composed of an inlet pipe 21, an ultrasonic sensor pipe 22, and a coupling flange 23, and the ultrasonic sensor pipe 22 is inserted and fixed with an ultrasonic sensor 24, and a fixing screw 25 is provided on the outside. ), and the inside is opened so that ultrasonic waves are transmitted and received from the ultrasonic sensor through the measuring pipe 11.

The measurement pipe unit 10 induces the fluid flowing in from the inlet pipe 21 at both ends to the measuring pipe 11 and the measuring pipe 11 in which the fluid to be measured is transferred and the propagation path of the ultrasonic wave is maintained, and the measuring pipe ( 11) is composed of induction ports 12 and 13 for attracting the fluid flowing out from the right outlet pipe 31 and flange coupling portions 14 and 15.

The outflow pipe part 30 is composed of an outflow pipe 31, an ultrasonic sensor pipe 32, and a coupling flange 33, and the ultrasonic sensor 34 is inserted and fixed in the ultrasonic sensor pipe, and the outside is fixed by a fixing screw 35. It is sealed waterproof and the inside is opened so that ultrasonic waves are transmitted and received from the ultrasonic sensor through the measuring pipe 11 .

The inflow pipe part 10 and the outflow pipe part 20 differ only in the flow direction of the fluid, but have the same function and structure, so they are commonly used for manufacturing any one, and since the ultrasonic flowmeter is inserted and connected to a straight pipe and operated, the inflow pipe (21) and the central axis 40 of the outlet pipe 31 are on the same straight line and form a predetermined inclination angle with the central axis 41 of the measurement pipe 11, so the inlet pipe 21 of the inlet pipe part 10 And the sensor installation tube 22 also has a certain inclination angle of the central axis.

If the flow rate per hour of fluid flowing through pipes of different diameters is the same, the smaller the diameter of the pipe, the faster the flow rate. The ultrasonic flowmeter that measures the flow rate depending on the flow rate can increase the precision of measurement by minimizing the diameter of the measuring pipe. This is especially true in the low-speed flow section. The diameter of the measuring pipe of the ultrasonic flowmeter is determined according to the maximum flow condition required for the diameter of the pipe to be connected, the diameter of the ultrasonic sensor used, and the minimum diameter required for the propagation line and reception sensitivity.

Flowmeters such as water meters are divided into 15mm, 20mm, 25mm, 32mm, 40mm and 50mm in diameter of the connecting pipe, and the maximum flow rate and precision conditions are standardized for each diameter. As shown in 2-B of FIG. 2, in the inflow pipe, d1 is the same as the diameter of the connecting pipe and d2 is the diameter of the measuring pipe. If , only the inflow pipe part is manufactured differently, that is, d2 is the same and d1 is different.

In addition, the ultrasonic flowmeter of the present invention is a battery-built electronic flowmeter, which not only has a flow detection function, but also displays information in the meter on a display device (LCD) and adopts a wired/wireless communication method to provide a smart meter with a means to provide a function as a smart meter. It is possible to implement a small-diameter ultrasonic flowmeter equipped with.

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Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and various modifications and equivalent other embodiments will be possible therefrom by those skilled in the art, but this is the present invention It can be understood that it is within the technical idea of

10: measuring pipe section 20: inlet pipe section 30: outlet pipe section
11: measuring pipe 12: measuring pipe inlet of inflow pipe
13: outlet pipe inlet of measuring pipe 14,15: flange coupling part
21: inlet pipe 22: ultrasonic sensor pipe 24: ultrasonic sensor
25: ultrasonic sensor fixing screw
31: outflow pipe 32: ultrasonic sensor pipe 34: ultrasonic sensor
35: ultrasonic sensor fixing screw
d1 : diameter of pipe connection part d2 : diameter of measuring pipe
40: the central axis of the inlet pipe and the outlet pipe 41: the central axis of the measuring pipe
100, 101: Ultrasonic reflector L: Ultrasonic measuring distance

Claims (3)

In the ultrasonic flowmeter to obtain the flow rate by measuring the flow rate using the propagation time difference between the reverse and forward directions of the ultrasonic wave in the flow of the fluid
The ultrasonic flowmeter has a structure in which a pair of ultrasonic sensors are directly connected to the measuring pipe, and the inflow pipe part, the measuring pipe part, and the outflow pipe part are separately manufactured and combined.
a) The inlet pipe part is connected to the pipe to which it is connected, an inflow pipe for allowing the inflowing fluid to flow into the measurement pipe, and an ultrasonic sensor pipe in which an ultrasonic sensor is inserted and fixed to form an ultrasonic wave port for transmitting and receiving ultrasonic waves to the measuring pipe; It is composed of a measuring pipe part and a flange as a coupling means.
b) The measuring pipe part has a flange, which is a connection means for the inflow pipe part, formed at one end of the measuring pipe part, and the coupling part flows the fluid flowing from the ultrasonic wave propagation line and the inlet pipe to the measuring pipe connected to the ultrasonic sensor pipe of the inflow pipe part A flange as a connecting means with the outlet pipe is formed at the other end of the attracting port, and the coupling part is an ultrasonic propagation line connected to the ultrasonic sensor tube of the outlet pipe and an attracting port that allows the fluid flowing out from the measuring pipe to flow into the outlet. The central portion has an ultrasonic straight tube type measuring pipe, and the inlet port of the inlet pipe and the outlet port of the outlet pipe of the measuring pipe have a structure of a measuring pipe positioned on different sides of 180 degrees on the measuring pipe.

c) the outflow pipe part is connected to the measurement pipe part, and an outflow pipe for allowing the inflowing fluid to flow into the outflow part pipe, and an ultrasonic sensor pipe in which an ultrasonic sensor is inserted and fixed to form an ultrasonic wave port for transmitting and receiving ultrasonic waves to the measuring pipe; It consists of a measuring pipe part and a flange which is a coupling means.
Ultrasonic flow meter characterized in that in claim 1
The position of the induction port of the inlet pipe connected to the side of one end of the measuring pipe and the inducing port of the outflow pipe connected to the side of the other end of the measuring pipe is 180 degrees different from each other. Ultrasonic flow meter characterized in that
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