CN218035257U

CN218035257U - Liquid level measuring system

Info

Publication number: CN218035257U
Application number: CN202220609799.4U
Authority: CN
Inventors: 邹肖华; 陈晓玮; 罗军; 施晋旻; 王超
Original assignee: Shanghai Lixiao Medical Technology Co ltd
Current assignee: Shanghai Lixiao Medical Technology Co ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-12-13
Anticipated expiration: 2032-03-18

Abstract

The utility model relates to a liquid level height measurement system belongs to measuring instrument technical field. Comprises a measurement controller and a floating object provided with a diffuse reflection surface; the measurement controller is arranged on the container above the liquid to be measured, and is provided with an ultrasonic transmitter and an ultrasonic receiver facing the liquid to be measured; the floater provided with the diffuse reflection surface is arranged on the surface of the liquid level to be measured, and the diffuse reflection surface of the floater faces the ultrasonic transmitter and the ultrasonic receiver. Through the utility model discloses can solve present detecting instrument and measure inaccurate, the ultrasonic wave by the incident angle of air to the liquid level when the liquid level is undulant the measurement that leads to is inaccurate, liquid transport motion in-process liquid level fluctuation leads to inaccurate and liquid container slope causes liquid level and container bottom surface to incline when the unsafe problem of liquid actual height measurement.

Description

Liquid level measuring system

Technical Field

The utility model relates to a liquid level height measurement system belongs to measuring instrument technical field.

Background

Liquid level measurement can be roughly classified into ultrasonic type, laser type, sinusoidal type, pressure type, induction type, and the like according to the measurement method. Each method has the advantages that the method is mainly used for small-range liquid level measurement in a sinusoidal mode, the pressure type precision is low, the laser and ultrasonic type measurement precision is high, no mechanical part is arranged, the reliability is high, and certain requirements are met for a single reflection target. The ultrasonic liquid level measuring instrument has wide application range, and can be used for measuring hydrological water level and wastewater level, even urine leakage of patients after operation. When the ultrasonic liquid level measuring instrument is used for measuring, the physical positions of the transmitter and the receiver are usually fixed, so that certain requirements are imposed on the incident angle of the reflecting surface in the measuring process. In a real application scene, the incident angle of the ultrasonic wave is changed due to some reasons (such as liquid flowing, container inclination or vibration, etc.), so that the liquid level measurement accuracy is low. Therefore, current research on ultrasonic measurement methods mainly focuses on improvement in measurement of incident angles. At present, the technical problem how to solve the technical problems of inaccurate liquid height detection in the movement process, inaccurate liquid height detection in the liquid flowing process and inaccurate liquid height detection caused by the fact that a measuring instrument is not installed at a proper position when the ultrasonic measuring instrument is applied needs to be solved urgently in the technical field.

Disclosure of Invention

The utility model aims at solving the technical problem that the liquid height in the motion process is inaccurate, the liquid height in the liquid flow process is inaccurate and the liquid height caused by the inaccurate installation of the measuring instrument is inaccurate.

In order to achieve the objective of solving the above problems, the present invention provides a liquid level measuring system, wherein a liquid to be measured is disposed in a container, and the measuring system includes a measuring controller and a floating object having a diffuse reflection surface; the measurement controller is arranged on the container above the liquid to be measured, and is provided with an ultrasonic transmitter and an ultrasonic receiver facing the liquid to be measured; the floater with the diffuse reflection surface is arranged on the surface of the liquid level to be measured, and the diffuse reflection surface of the floater faces the ultrasonic transmitter and the ultrasonic receiver.

Preferably, the float comprises a porous foam or cork plate.

Preferably, the bottom of the container is provided with a reflector for reflecting ultrasonic waves, and the reflector is provided with a reflecting surface.

Preferably, the reflector is provided with a reflecting curved surface, and the bottom of the container is also provided with a wave-absorbing material.

Preferably, the reflector is disposed below the ultrasonic transmitter and the ultrasonic receiver at a position where the reflector can receive and reflect the ultrasonic waves.

Compared with the prior art, the utility model discloses following beneficial effect has:

the technical problem that the current detection instrument measures inaccurately when the liquid level fluctuates (such as liquid level shake caused in the liquid flowing process) can be solved; the technical problem that the measurement is inaccurate due to the change of the incident angle of the ultrasonic waves from air to the liquid level (such as the inclination of a liquid container) is solved; the problem of liquid transport in-process liquid level fluctuation lead to the measurement inaccurate to and when liquid container slope causes liquid level and container bottom surface slope, measure liquid actual height inaccurate is solved.

Drawings

FIG. 1 is a schematic view of the structure of the main components of the system of the present invention;

FIG. 2 is a schematic diagram of the ultrasonic ranging principle;

FIG. 3 is a schematic view of the ultrasonic transmission and reception when the present invention is applied without diffuse reflection object;

FIG. 4 is a schematic view of the ultrasonic wave transmission and reception when the utility model is applied with diffuse reflection objects;

FIG. 5 is a schematic diagram I of the ultrasonic wave transmission and reception in the application of the present invention;

FIG. 6 is a schematic diagram of the ultrasonic transmission and reception of the present invention;

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:

as shown in fig. 1-6, the present invention provides a liquid level measuring system, in which a liquid to be measured is disposed in a container, the measuring system includes a measuring controller 01 and a floating object 04 having a diffuse reflection surface; the measurement controller 01 is arranged on a container above the liquid to be measured, and the measurement controller 01 is provided with an ultrasonic transmitter 02 and an ultrasonic receiver 03 facing the liquid to be measured; the floater 04 provided with the diffuse reflection surface is arranged on the surface of the liquid level to be measured, and the diffuse reflection surface of the floater 04 faces the ultrasonic transmitter 02 and the ultrasonic receiver 03. The float 04 includes porous foam, cork plate, etc. The bottom of the container is provided with a reflector for reflecting ultrasonic waves, and the reflector is provided with a reflecting surface. The reflector is provided with a reflecting curved surface, and the bottom of the container is also provided with a wave-absorbing material. The reflector is disposed below the ultrasonic transmitter 02 and the ultrasonic receiver 03 at a position where the ultrasonic wave can be received and reflected.

Examples

As shown in fig. 1-6, the present invention provides a detection system for measuring the height of liquid by using the ultrasonic reflection distance measurement principle. The system architecture is as follows:

the system mainly comprises: a measurement controller 01, an ultrasonic transmitter 02, an ultrasonic receiver 03, and a float 04 provided with a diffuse reflection surface.

The measurement controller 01 is a measurement control system, and controls the work of the ultrasonic transmitter 02 and the ultrasonic receiver 03 and times; the time interval from the transmission of the ultrasonic wave to the reception of the ultrasonic echo by the ultrasonic receiver 03 is calculated, and the liquid level height is calculated based on the time interval.

And an ultrasonic transmitter 02 for converting the electrical signal into an ultrasonic signal.

And an ultrasonic receiver 03 for converting the ultrasonic signal into an electrical signal.

The floating object 04 provided with the diffuse reflection surface is an object (selected according to the type of the liquid to be detected, such as porous foam, cork board and the like) capable of floating on the surface of the liquid, and the floating object 04 is provided with the diffuse reflection surface for producing the ultrasonic wave when the ultrasonic wave is reflected from the air to the liquid surface.

The principle of ultrasonic ranging is shown in fig. 2:

assuming that h _ air is the distance between the measured liquid level and the emitter, the measured time is the emitting and receiving time interval t, and the propagation velocity of the ultrasonic wave in the air is represented by v, the relation (1) exists

h_air＝vt/2 (1)

The influence of temperature on the propagation velocity of ultrasonic waves is corrected by the formula (2)

v＝331.4+0.607T (2)

And the actual liquid level H _ liq, and the height H _ amount of the controller and the bottom of the container are measured.

h_liq＝H_amount-h_air (3)

The floater 04 with the diffuse reflection surface provides physical conditions for incident waves to be subjected to diffuse reflection. In the prior art, during actual measurement, an included angle between a liquid level and a plane where an ultrasonic transmitter is located is changed frequently, so that an ultrasonic receiver cannot receive reflected waves, and measurement fails. As shown in fig. 3;

after the floating object 04 provided with the diffuse reflection surface is added at the boundary position of the air and the liquid, no matter what kind of movement, inclination and the like of the liquid surface cause the change of the incident angle of the ultrasonic wave from the air to the liquid surface, due to the diffuse reflection, a part of the reflected ultrasonic wave is always received by the ultrasonic receiver 03, and therefore the liquid surface height of the ultrasonic receiver is accurately measured. As shown in fig. 4;

in the case where the liquid level depth is unknown, the liquid depth h _ liq is calculated from the time of reception of the ultrasonic wave by the ultrasonic receiver 03 and the velocity of the ultrasonic wave in the liquid. As shown in fig. 5;

for certain known containers, a spherical reflective curved surface may be provided near a center point of the bottom surface of the container, the spherical center point being a point location in the ultrasonic generator. Wave-absorbing materials can be paved in the area outside the spherical reflection curve of the bottom surface of the container to reduce ultrasonic interference. As shown in fig. 6.

The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.

Claims

1. A liquid level measuring system, the liquid to be measured is located in a container, characterized by that, the measuring system includes measuring the controller and floater with diffuse reflection surface; the measurement controller is arranged on the container above the liquid to be measured, and is provided with an ultrasonic transmitter and an ultrasonic receiver facing the liquid to be measured; the floater with the diffuse reflection surface is arranged on the surface of the liquid level to be measured, and the diffuse reflection surface of the floater faces the ultrasonic transmitter and the ultrasonic receiver.

2. A liquid level measuring system according to claim 1, wherein said float comprises porous foam or cork plate.

3. A liquid level measuring system according to claim 1, wherein the bottom of the container is provided with a reflector for reflecting ultrasonic waves, the reflector being provided with a reflecting surface.

4. The liquid level measuring system according to claim 3, wherein the reflector is provided with a reflecting curved surface, and the bottom of the container is further provided with a wave-absorbing material.

5. A liquid level measuring system according to claim 4, wherein the reflector is located below the ultrasonic transmitter and receiver in a position to receive and reflect the ultrasonic waves.