Liquid level measuring device and method of measuring

Abstract

The application relates to a liquid level measuring device, which comprises a container, a base fixed at the bottom of the container and comprising a horizontally arranged first wall, a bellow with one end fixed on the first wall and the other end fixed with a magnet, a displacement sensor fixed at the bottom of the first wall, which measures the distance L between the end surface of the sensor and the magnet and outputs an electric signal, wherein the air inside the bellow is communicated with the atmosphere; when the liquid level is higher, the compression amount of the bellow is larger, and the electric signal output by the displacement sensor can obtain the displacement amount of the bellow; whether the liquid level is in the icing state is judged, and the liquid level height is calculated through a formula, so that the liquid level height can be accurately measured.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of measuring devices, specifically a kind of liquid level measuring device. BACKGROUND

[0002] The conventional liquid level measuring device structure is complex, in addition, the existing liquid level measuring device has the following several shortcomings:

[0003] 1, in the ice state of liquid surface, liquid level measuring device measurement data will appear error;

[0004] 2, liquid is shaken to produce foam, leading to liquid level measuring device error;

[0005] 3, when the container is tilted, leading to liquid level measuring device error;

[0006] In summary, how to accurately measure the liquid level height becomes the problem that the company researcher needs to solve urgently. SUMMARY

[0007] The technical problem to be solved by the present application is how to accurately measure the liquid level height;

[0008] In order to solve the above technical problem, the present application adopts the following technical scheme:

[0009] The present application is a kind of liquid level measuring device, including: container;Base, it is fixed at the bottom of container, it includes the first wall of horizontal arrangement;Bellows, one end is fixed on the first wall, the other end is fixed with magnet;Displacement sensor, it is fixed at the bottom of the first wall, it measures the distance L between sensor end face and magnet, and outputs electrical signal;Wherein, the air in the bellows is communicated with atmosphere.

[0010] The role of base is to fix the bellows, and the cooperation of magnet and displacement sensor obtains the expansion displacement of bellows;The electrical signal output by displacement sensor can obtain the displacement of bellows;When the liquid level is higher, the compression amount of bellows is also larger, in addition, using the principle of pressure generating bellows displacement, liquid level detection error caused by liquid shaking to produce foam can be excluded.

[0011] In order to explain the measurement method of liquid level measuring device, the present application adopts the following steps:

[0012] S1: displacement sensor is powered on, obtains electrical signal, carries out self-checking to displacement sensor, and sends signal to ECU, signal is normal, enters S2;

[0013] S2: logical judgment:

[0014] When power-on starts, compare the measured H value with the previous H value, if the change amount suddenly increases, it can be determined that it is icing, enter S4, otherwise enter S3;

[0015] S3, calculate the liquid level height H using the displacement, the formula is H=(∆L•K) / (ρ•g), where H is the liquid level height, ρ is the liquid density, g is the gravitational acceleration, K is the bellows elastic coefficient, and ∆L is the displacement of the bellows; proceed to S5;

[0016] S4: Send a signal to the ECU to start container heating; if the change H suddenly decreases, it indicates that the ice is breaking, and proceed to S3;

[0017] S5: Send the data to the display for user viewing, end;

[0018] In S2, the change in ∆L is used to determine whether the liquid surface is in a frozen state. The change in ∆L is measured by the displacement of the upper end face of the magnet at the beginning and end.

[0019] The beneficial effects of the present invention are as follows: The present invention is a liquid level measuring device. When the liquid level is higher, the compression of the bellows is also greater. The displacement of the bellows can be obtained by the electrical signal output by the displacement sensor. It can determine whether the liquid level is in a frozen state and then calculate the liquid level height by formula. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a schematic diagram of the structure of the present invention, wherein the dashed line represents the state when the magnet is compressed;

[0022] In the diagram: 1-Container, 2-Base, 3-First wall, 4-Sensor end face, 5-Bellwall, 6-Magnet, 7-Displacement sensor. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0024] like Figure 1 As shown, the present invention is a liquid level measuring device, comprising: a container 1; a base 2, which is fixed to the bottom of the container 1 and includes a horizontally arranged first wall 3; a bellows 5, one end of which is fixed to the first wall 3 and the other end of which is fixed to a magnet 6; a displacement sensor 7, which is fixed to the bottom of the first wall 3, measures the distance L between the sensor end face 4 and the magnet 6, and outputs an electrical signal; wherein the air inside the bellows 5 is in communication with the atmosphere.

[0025] The base is used for fixing the bellows, and the cooperation of the magnet and the displacement sensor obtains the extension displacement of the bellows; the electric signal output by the displacement sensor can obtain the displacement of the bellows; when the liquid level is higher, the compression amount of the bellows is larger; in addition, the principle of generating the displacement of the bellows by pressure can eliminate the foam generated by shaking of the liquid, so as to cause the liquid level detection error.

[0026] As Figure 1 shown, in order to illustrate the measurement method of the liquid level measuring device, the present application adopts the following steps:

[0027] S1: the displacement sensor is powered on to obtain an electric signal, the displacement sensor is self-checked, and a signal is sent to the ECU; if the signal is normal, S2 is entered;

[0028] S2: logical judgment:

[0029] When the power is started, the measured H value is compared with the previous H value; if the change amount suddenly increases, it can be determined that it is icing, S4 is entered, otherwise S3 is entered;

[0030] S3: the liquid level height H is calculated through the displacement amount, and the formula is H=(AL•K) / (p•g), wherein H is the liquid level height, p is the liquid density, g is the gravitational acceleration, K is the elastic coefficient of the bellows, and AL is the displacement amount of the bellows; S5 is entered;

[0031] S4: a signal is sent to the ECU to start heating the container; if the change amount H suddenly decreases, it indicates that the ice is broken, and S3 is entered;

[0032] S5: data is sent to the display for the user to view, and the process is ended;

[0033] In S2, the change amount of AL is judged to know whether the liquid level is in the icing state, wherein the change amount of AL is measured through the displacement amount of the start and end positions of the upper end surface of the magnet.

[0034] The present application is a liquid level measuring device; when the liquid level is higher, the compression amount of the bellows is larger; the electric signal output by the displacement sensor can obtain the displacement amount of the bellows; whether the liquid level is in the icing state is judged, and the liquid level height is calculated through the formula. Embodiment

[0035] The detected V is 2.5V, so AL is 5mm;

[0036] The density of water is 1g / cm 3 , that is, 1000kg / m 3 .

[0037] AL is 5mm, that is, 5*10 -3 m, and k is 4kPa / cm, that is, 400kPa / m

[0038] H=(AL•K) / (p•g)

[0039] H=(5×10 -3 •400×10 3 ) / (1000•10)

[0040] So H=0.2 meter, i.e. the liquid level height is 0.2 meter.

[0041] The device can be used for liquid level height measurement of solar water heater, liquid level detection of automobile urea tank, liquid level detection of automobile fuel tank, etc.

[0042] The above ideal embodiments according to the present application are used as inspiration, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and the technical scope must be determined according to the scope of claims.

Claims

1. A measuring method of a liquid level measuring device, characterized by, The liquid level measuring device comprises: a container; a base fixed at the bottom of the container, comprising a first wall arranged horizontally; a bellows, one end of which is fixed to the first wall at the bottom, and the other end of which is fixed with a magnet; a displacement sensor fixed at the bottom of the first wall, which measures the distance L between the end surface of the sensor and the magnet and outputs an electrical signal; wherein the air inside the bellows is in communication with the atmosphere; the higher the liquid level, the greater the compression of the bellows; comprising the following steps: S1: the displacement sensor is powered on to obtain an electrical signal, and the displacement sensor is self-checked and sends a signal to the ECU, and if the signal is normal, it enters S2; S2: logical judgment: when the power is on, the measured H value is compared with the previous H value, if the change suddenly increases, it is determined to be icing, and it enters S4, otherwise it enters S3; S3, the liquid level height H is calculated by the displacement, the formula is H=(ΔL•K) / (ρ•g), wherein H is the liquid level height, ρ is the liquid density, g is the acceleration of gravity, K is the elastic coefficient of the bellows, and ΔL is the displacement of the bellows; enter S5; S4: send a signal to the ECU to start heating the container; if the change H suddenly decreases, it indicates that the ice is broken, and it enters S3; S5: send data to the display for the user to view, and end; wherein in S2, the change of ΔL is used to determine whether the liquid surface is in the icing state, wherein the change of ΔL is measured by the displacement of the upper end surface of the magnet.

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