CN105136240A - Liquid level sensor - Google Patents

Abstract

The invention discloses a liquid level sensor which comprises a housing, a microprocessor, a dwell vessel, a display screen, a density sensor, a pressure sensor, a mini motor, a power supply module and a wire wheel, wherein the housing comprises a T-shaped pipe including a later pipe and a handheld pipe and a longitudinal pipe, the power supply module is arranged on the right side in the handheld pipe, the mini motor is arranged on the left side of the power supply module, the wire wheel is arranged on the left side of the mini motor, the display screen is arranged on the upper surface of the lateral pipe, the microprocessor and the dwell vessel are arranged under the display screen, a foraminous waterproof separator plate is arranged in the longitudinal pipe, the pressure sensor passes through the foraminous waterproof separator plate via a signal transmission line and connects with the wire wheel, and the density sensor is arranged on the longitudinal pipe. The density sensor and the pressure sensor are connected through the microprocessor, and the density sensor and the pressure sensor send real-time measured values to the microprocessor for many times. The liquid level of the detected liquid is calculated, and the liquid level change can be measured in short time.

Description

a liquid level sensor

technical field

The invention belongs to the technical field of sensors, and in particular relates to a liquid level sensor.

Background technique

At present, liquid level sensors have been widely used for measurement in various situations and environments. According to their different working principles, liquid level sensors can be divided into many types, including: ultrasonic liquid level sensors, radar liquid level sensors and pressure liquid level sensors. , wherein the pressure liquid level sensor is the most widely used one among the above liquid level sensors.

Most of the existing pressure liquid level sensors measure the depth of liquid level by liquid density and pressure according to known solutions.

However, when the controller of the pressure liquid level sensor processes the detection signal, the liquid density set inside the controller is different from the actual density of the liquid to be measured, which will cause a certain error in the liquid level obtained by the sensor. Therefore, At present, the measurement accuracy of the pressure liquid level sensor is not high.

Contents of the invention

One of the objectives of the present invention is to provide a liquid level sensor with accurate measurement to solve the problems in the prior art.

The invention provides a liquid level sensor, comprising: a shell, a microprocessor, a register, a display screen, a density sensor, a pressure sensor, a micro motor, a power module and a wire wheel; the shell includes a T-shaped tube and a vertical tube, and the The T-shaped tube includes a horizontal tube and a hand-held tube, the right side of the hand-held tube is provided with the power module, the left side of the power module is the micro motor, and the left side of the micro motor is connected to the wire wheel; The upper surface of the horizontal tube is provided with the display screen, and the microprocessor and the register are provided below the display screen; a waterproof partition with holes is provided in the vertical tube, and the pressure sensor passes through the The waterproof partition with holes is connected to the wire wheel; the density sensor is also arranged on the longitudinal tube;

The power supply module is connected to the microprocessor, register, display screen, density sensor, pressure sensor and micro motor, and supplies power;

The density sensor is connected to the register, and stores the measured liquid density information into the register;

The microprocessor is connected to the register, the display screen and the pressure sensor, and the microprocessor acquires the liquid density information in the register and the pressure measured by the pressure sensor, processes and obtains the liquid level information, and simultaneously converts the liquid Bit information is transmitted to the display screen for display.

Further, a switch valve is provided on the handle tube, and the switch valve is connected with the micro motor for controlling its switch.

Further, the display screen is an LED display screen.

Further, the power module includes a charging interface, and the charging interface is exposed outside the right end of the handle tube.

The beneficial effects of the present invention are that, in the liquid level sensor provided by the present invention, the density sensor and the pressure sensor are connected through a microprocessor, and the density sensor and the pressure sensor can transmit real-time measured values to the microprocessor for many times, and calculate The liquid level height of the liquid to be measured is obtained, which greatly improves the measurement accuracy of the liquid level compared with the prior art, and can be applied to the measurement of the liquid level change in a short time.

Description of drawings

Fig. 1 is a sectional view of a liquid level sensor of the present invention.

Fig. 2 is a top view of a liquid level sensor of the present invention.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with specific drawings. It should be noted that the technical features or combinations of technical features described in the following embodiments should not be regarded as isolated, and they can be combined with each other to achieve better technical effects.

As shown in Figures 1 and 2, the present invention provides a liquid level sensor, including: a housing, a microprocessor 1, a register 2, a display screen 3, a density sensor 4, a pressure sensor 5, a micro motor 6, a power module 7 and Wire wheel 8; the shell includes a T-shaped tube and a vertical tube, the T-shaped tube includes a horizontal tube and a hand-held tube, and the right side of the hand-held tube is provided with a power module 7, and the left side of the power module 7 is a micro-motor 6, and the left side of the micro-motor 6 is connected Wired wheel 8; a display screen 3 is provided on the upper surface of the horizontal tube, and a microprocessor 1 and a register 2 are provided below the display screen 3; a waterproof partition 9 with a hole is provided in the vertical tube, and the pressure sensor 5 passes through the waterproof wall with a hole through the signal transmission line. The partition 9 is connected to the wire wheel 8; the longitudinal tube is also provided with a density sensor 4;

The power module 7 is connected to the microprocessor 1, the register 2, the display screen 3, the density sensor 4, the pressure sensor 5 and the micro motor 6, and supplies power;

The density sensor 4 is connected to the register 2, and stores the measured liquid density information to the register 2;

Microprocessor 1 is connected to register 2, display screen 3 and pressure sensor 5. Microprocessor 1 obtains the liquid density information in register 2 and the pressure measured by pressure sensor 5, processes it to obtain liquid level information, and transmits the liquid level information to display 3 for display.

Further, a switch valve 10 is provided on the hand-held tube, and the switch valve 10 is connected with the micro motor 6 for controlling its switch.

Further, the display screen 3 is an LED display screen.

Further, the power module 7 includes a charging interface, and the charging interface is exposed outside the right end of the handheld tube.

Example:

The measurement principle of the present invention is: the pressure sensor 5 is used to transmit the pressure information to the microprocessor 1 while acquiring the pressure value in the liquid, and the microprocessor 1 obtains the liquid level height value of the liquid according to the pressure value and the average value of the liquid density. The pressure formula is: P=ρgH, wherein H is the depth at which the pressure sensor 5 is put into the measured liquid, P is the liquid pressure at the current depth, ρ is the average density of the measured liquid, and g is the local gravity acceleration. Therefore, the pressure sensor 5 is based on The received measured liquid density average value ρ and the measured pressure P on the liquid facing surface of the sensor are obtained, and the measured liquid level height H=ΔP/ρx.g is calculated.

When measuring, start the micro motor 6 through the switch valve 10, the micro motor 6 drives the wire wheel 8 to rotate, put down the pressure sensor 5, and simultaneously immerse the density sensor 4 in the liquid and transmit multiple sets of real-time density information to the register 2 for storage. At the same time, after the microprocessor 1 obtains the density information and pressure information, it first averages multiple sets of density information and pressure information; then performs processing and calculation, and displays it through the display screen 3, so that the liquid level information can be obtained quickly and accurately. After use, press the switch valve 10 again to make the micro motor 6 run in reverse, and the pressure sensor 5 can be retracted.

A liquid level sensor provided by the present invention connects the density sensor 4 and the pressure sensor 5 through the microprocessor 1, and the density sensor 4 and the pressure sensor 5 can transmit the real-time measurement values to the microprocessor 1 many times, and calculate Compared with the prior art, the liquid level height of the liquid to be measured is measured, which greatly improves the measurement accuracy of the liquid level, and can be applied to the measurement of liquid level changes in a short period of time.

Although some embodiments of the present invention have been given herein, those skilled in the art should understand that the embodiments herein can be changed without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be used as limitations on the scope of rights of the present invention.

Claims (4)

1. a liquid level sensor, is characterized in that, comprising: shell, microprocessor, register, display screen, density sensor, pressure transducer, micromachine, power module and line are taken turns; Described shell comprises T-shaped pipe and longitudinal tubule (L tubule), and described T-shaped pipe comprises transverse tube and hand-held pipe, and described hand-held pipe inner right side is provided with described power module, is described micromachine on the left of described power module, is connected with described line wheel on the left of described micromachine; Described transverse tube upper surface is provided with described display screen, is provided with described microprocessor and register below described display screen; Be provided with a waterproof bulkhead with holes in described longitudinal tubule (L tubule), described pressure transducer is connected to described line wheel by signal transmssion line through described waterproof bulkhead with holes; Described longitudinal tubule (L tubule) is also provided with described density sensor;

Described power module connects described microprocessor, register, display screen, density sensor, pressure transducer and micromachine, and powers;

Described density sensor connects described register, and deposits to described register by the fluid density information of measurement;

Described microprocessor connects described register, display screen and pressure transducer, described microprocessor obtains the pressure that fluid density information in described register and pressure transducer record, carry out process and obtain liquid level information, described liquid level information transmission to described display screen is shown simultaneously.

2. a kind of liquid level sensor as claimed in claim 1, is characterized in that, described hand-held pipe is provided with a switch valve, and described switch valve is connected with described micromachine, and described switch valve is for controlling the switch of described micromachine.

3. a kind of liquid level sensor as claimed in claim 1, is characterized in that, described display screen is LED display.

4. a kind of liquid level sensor as claimed in claim 1, is characterized in that, described power module comprises charging inlet, and described charging inlet is exposed to outside described hand-held pipe right-hand member.