Multi-point liquid level sensor based on angle sensing principle

Abstract

The multi-point liquid level sensor based on the angle sensing principle comprises a power module and a protective outer pipe, the power module is arranged in an inner cavity of the protective outer pipe, a plurality of magnetic induction units are sequentially arranged on the side wall of the inner cavity of the protective outer pipe from bottom to top, and a plurality of floating magnetic rings are arranged on the outer portion of the protective outer pipe in a sleeved mode. The sensor adopts the magnetic angle principle, has the characteristics of high precision, non-contact measurement, low power consumption, high reliability and the like, is not influenced by a liquid medium, is high in applicability, is particularly suitable for industrial application scene requirements which are difficult to meet by a traditional sensor, such as severe environments, high precision requirements and design requirements of miniaturization and customization of large and small measuring ranges, and has wide application prospects. In addition, the liquid level sensor has the advantages of high integration level, low cost and the like, and solves the problem that a traditional sensor cannot measure multi-point liquid levels and mixed layered liquid levels at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid level sensor technical field, concretely to a kind of multipoint liquid level sensor based on angle sensing principle. BACKGROUND

[0002] Several commonly used liquid level sensors on market are analyzed as follows:

[0003] 1: dry reed liquid level sensor:

[0004] Advantages: simple structure, low cost.

[0005] Disadvantages: single liquid level measurement, slow response speed, low precision, signal easy to jitter, non-continuous measurement, large dead zone.

[0006] 2: capacitive liquid level sensor:

[0007] Advantages: fast response, no wear, high durability, can be used for various liquids and solid substances.

[0008] Disadvantages: single liquid level measurement, affected by liquid dielectric constant, sensitive to capacitance change, needs to be calibrated before use, greatly affected by environment.

[0009] 3, ultrasonic liquid level sensor:

[0010] Advantages: non-contact measurement, high precision. Can be used for long distance measurement.

[0011] Disadvantages: single liquid level measurement, greatly affected by liquid surface fluctuation and foam and other surface impurities. Cannot be used for small-bore liquid level measurement, with limitations. Sensitive to temperature and humidity changes, needs temperature and humidity compensation, higher cost.

[0012] 4, pressure type liquid level sensor (immersed liquid level):

[0013] Advantages: simple structure, easy to install. Can be used for liquid level measurement of closed container and deep water environment. High precision.

[0014] Disadvantages: single liquid level measurement, not suitable for small range measurement, greatly affected by liquid density change, needs to be calibrated for different measurement media. There is zero drift, may need regular maintenance and calibration when used.

[0015] Therefore, we urgently need to design a liquid level sensor to solve the above problems. INVENTION CONTENTS

[0016] The utility model aims at the deficiencies of prior art, provides a kind of multipoint liquid level sensor based on angle sensing principle to solve the problems raised in background art.

[0017] In order to achieve the above object, the utility model provides the following technical scheme:

[0018] A multi-point liquid level sensor based on angle sensing principle, including power module and protection outer tube, including power module setting in the inner chamber of protection outer tube, the inner chamber lateral wall of protection outer tube is from below to upwards and sets a plurality of magnetic induction units, the outside of protection outer tube is equipped with a plurality of floating magnetic ring.

[0019] Preferably, the power module adopts LDO linear voltage regulator power supply.

[0020] Preferably, the protection outer tube adopts stainless steel degaussing outer tube, and the length of the protection outer tube is 0.1m-1.5m.

[0021] Preferably, the floating magnetic ring includes a plastic air bag in the shape of a cylinder and a permanent magnetic ring, and the permanent magnetic ring is arranged on the outer lateral wall of the plastic air bag.

[0022] Preferably, the magnetic induction unit adopts AS5600 magnetic angle sensor, and the distance between the two adjacent magnetic induction units is 1-2cm.

[0023] Preferably, the inner chamber lateral wall of the protection outer tube is provided with a central processing unit, and the central processing unit is electrically connected with the power module and the magnetic induction unit.

[0024] Compared with the prior art, the utility model has the beneficial effects that:

[0025] The magnetic angle principle has the characteristics of high precision, non-contact measurement, low power consumption and high reliability, is not affected by liquid medium, has strong applicability, is especially suitable for the industrial application scene requirements that the traditional sensor is difficult to meet, such as harsh environment, high precision requirement and miniaturization, large and small range customization design requirement, in addition, has the advantages of high integration and low cost, and solves the problems that the traditional sensor cannot measure multi-point liquid level and mixed layered liquid level at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a kind of multi-point liquid level sensor based on angle sensing principle structure schematic diagram;

[0027] Figure 2 It is a kind of multi-point liquid level sensor based on angle sensing principle principle diagram. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0029] The specific embodiments of the present application are described in detail below in combination with the drawings and multiple embodiments.

[0030] In order to better explain the embodiments of the present application, the rectal cancer neoadjuvant chemoradiotherapy efficacy prediction method and system based on magnetic resonance image analysis are described in detail through several specific embodiments. Each embodiment covers the complete process from image acquisition, processing to efficacy prediction.

[0031] Referring to Figure 1 and Figure 2 The technical solutions of the present application mainly include a power module, a central processing unit, a magnetic angle sensing unit, a magnetic ring, a protective outer tube and the like. The power module 1 adopts a wide power input linear LDO, has a wide input voltage range, meets 9-36VDC input, has small ripple, and avoids interference of electromagnetic sensitive devices such as switching power supply and inductor on the magnetic field.

[0032] The central processing unit 2 acquires the angle value of each magnetic angle chip in real time through an IIC interface, and can accurately convert the liquid level height value after calculation through the physical position corresponding to the sensor chip number and the corresponding angle value. Since the angle values of all chips can be acquired at the same time, multiple point liquid levels and the difference of each point liquid level can be measured when multiple magnetic fields or multiple angle values exist, so as to achieve the purpose of measuring multiple point liquid levels and differential liquid levels.

[0033] The protective outer tube 3 adopts a stainless steel demagnetization outer tube, has good protection, corrosion resistance, is suitable for measurement in various industrial application occasions, has good stability and long service life.

[0034] The floating magnetic ring 4 mainly generates a stable and accurate magnetic field, so that the magnetic angle sensor can detect the change of its position, thereby converting the angle of the measured object into accurate position. Since the magnetic ring and the protective outer sleeve adopt a non-contact mode, there is no mechanical wear risk, the service life is long, the measurement has no attenuation and drift, and the density of the magnetic ring is customizable to adapt to different liquid medium multi-point (layer) liquid level measurement requirements.

[0035] Magnetic induction unit 5: AS5600 magnetic angle sensor is a non-contact rotary position sensor based on Hall effect, which can sensitively detect the magnetic field change generated by a rotating magnet on its chip. When the external magnetic ring approaches, the two magnetic chip internal Hall sensor array closest to the magnetic ring will be detected and converted into the corresponding angle value and transmitted to the central processing unit through IIC digital signal. Since the IIC signal has the ability of multiple master and multiple slave, the same CPU unit can hang multiple magnetic angle sensing chips at the same time to adapt to different range segment measurement requirements. And each magnetic induction chip acts independently, and different position magnetic sensing chip can check the existence of multiple magnetic fields (magnetic ring) at the same time, so as to achieve the purpose of measuring multi-point liquid level or differential liquid level.

[0036] Measured medium 6, whose liquid density is less than that of medium 7, floats on medium 7. The upper part of the magnetic ring has a magnetic density less than that of medium 6 and medium 7, so when the liquid surface of medium 1 fluctuates, the upper part of the magnetic ring will move with the liquid surface of medium 6, thereby causing the corresponding magnetic field angle to move.

[0037] Measured medium 7, whose liquid density is greater than that of medium 6, sinks to the bottom. The lower part of the magnetic ring has a density greater than that of medium 6 and less than that of medium 7, so it fluctuates with the fluctuation of the liquid surface of medium 7.

[0038] The same applies when there are other liquids of different media.

[0039] The contents not described in detail in the description belong to the prior art known to those skilled in the art. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A multi-point liquid level sensor based on the angle sensing principle, comprising a power supply module (1) and a protective outer tube (3), characterized in that, The system includes a power module (1) installed inside the inner cavity of the protective outer tube (3). Several magnetic induction units (5) are arranged sequentially from bottom to top on the inner wall of the protective outer tube (3). Several floating magnetic rings (4) are sleeved on the outside of the protective outer tube (3). The floating magnetic ring (4) includes a cylindrical plastic air bag and a permanent magnet ring. The permanent magnet ring is set on the outer wall of the plastic air bag. There are 1-4 floating magnetic rings (4). The magnetic induction unit (5) adopts an AS5600 magnetic angle sensor. The distance between two adjacent magnetic induction units (5) is 1-2cm. The protective outer tube (3) adopts a stainless steel demagnetizing outer tube. The length of the protective outer tube (3) is 0.1m-1.5m. The power module (1) adopts an LDO linear regulated power supply.

2. A multi-point liquid level sensor based on the angle sensing principle according to claim 1, characterized in that: The inner wall of the protective outer tube (3) is provided with a central processing unit (2), which is electrically connected to the power module (1) and the magnetic induction unit (5).

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