WO2010015132A1

WO2010015132A1 - Servo liquid level meter

Info

Publication number: WO2010015132A1
Application number: PCT/CN2008/073491
Authority: WO
Inventors: 范明军
Original assignee: Fan Mingjun
Priority date: 2008-08-06
Filing date: 2008-12-12
Publication date: 2010-02-11
Also published as: CN101334307B; CN101334307A

Abstract

A servo liquid level meter comprises a float (1). Measuring elements such as a temperature sensor (9), a pressure sensor (10) and an interface sensor (11) are fixed on the float (1); a contact (2) provided on the shell body of the float (1) is connected with a working circuit provided in the float (1). When the float (1) is moved up and down, the contact (2) is enabled to contact or cut off a contact electrode (3). When the contact electrode (3) is in contact with the contact (2), a main-board of the liquid level meter detects the voltage of a power supply circuit in the float (1) through the contact (2), and thereby charges the power supply circuit in the float (1) according to the detected result, and moreover, the working circuit can exchange information with exterior through the contact (2) and the contact electrode (3).

Description

Instruction Manual Servo Level Gauge

[I] Technical field

[2] The present invention relates to a liquid level measuring technique, and more particularly to a servo type liquid level meter.

[3] Background of the invention

[4] At present, liquid level gauges are widely used in the storage and transportation systems of petroleum, chemical, edible oil, beverage, brewing and other industries.

Through the measurement of the liquid level of the liquid stored in various tanks, the purpose of measuring the liquid stored and transported is achieved.

[5] The principle of the metering method of the level gauge is that by measuring the liquid level or its change, the volume of the liquid or its variation can be determined according to the cross-sectional area of the corresponding position of the tank. Then, according to the formula m=pV (where m represents the mass of the liquid, p represents the density of the liquid, and V represents the volume of the liquid), the amount of liquid stored in the tank or the amount of liquid delivered from the tank can be determined.

[6] There are many types of level gauges in the prior art, such as contact and non-contact direct level measurement methods, static pressure methods, and the like.

[7] Contact direct liquid level measurement method is to measure the liquid level or oil-water interface by the stepper motor. Depending on the buoyancy of the float in the air and in different liquids, the position of the float is sensed, and the float is equipped with a battery to supply power to the working circuit in the float.

[8] The above prior art has at least the following disadvantages:

[9] It is very inconvenient to replace the battery frequently; and the battery supply voltage is unstable and the measurement error is large.

[10] Summary of the invention

[I I] An object of the present invention is to provide a servo type liquid level gauge which is convenient to use and accurate in measurement.

[12] The object of the present invention is achieved by the following technical solutions:

[13] The servo-type liquid level gauge of the present invention includes a float, a working circuit is disposed in the float, the working circuit is connected with a power circuit, and a contact of the float is provided on the housing of the float, The power circuit connection

[14] The servo type liquid level gauge further includes a contact electrode, wherein the contact electrode can be in contact with or disconnected from the contact, the contact electrode is connected to the liquid level gauge main board, and is connected through the liquid level gauge main board. Charging unit and voltage Detection unit.

[15] It can be seen from the technical solution provided by the present invention that the servo-type liquid level gauge of the present invention has a contact on the housing of the float, and the contact is connected with the power supply circuit in the float; the contact electrode can be It is in contact with or disconnected from the contact, and the contact electrode is connected with a charging unit and a voltage detecting unit. When the contact electrode is in contact with the contact port, the charging unit and the voltage detecting unit are connected to the power supply circuit in the float, and the voltage of the power supply circuit in the float can be detected, and the power supply circuit in the float is charged according to the detected result. Solve the problem of power supply in the working circuit of the float, easy to use, stable working voltage and accurate measurement.

[16] BRIEF DESCRIPTION OF THE DRAWINGS

[17] FIG. 1 is a schematic structural view of a servo type liquid level gauge of the present invention;

[18] FIG. 2 is a circuit block diagram of a servo type liquid level gauge of the present invention.

[19] Mode for carrying out the invention

[20] The servo type liquid level meter according to the present invention, which is shown in Fig. 1, includes a float 1, and the float 1 is connected to the driven wheel 5 of the servo level gauge via a measuring rule 4. The stepping motor 7 drives the driven wheel 5 to rotate, which can drive the float 1 to move up and down. When the liquid level changes, the buoyancy of the float changes, and the generated torque acts on the force sensor 8, which can accurately measure the buoyancy and change according to the buoyancy. Measure the liquid level. The servo level gauge further includes a photoelectric collecting element 6 for collecting the height information of the measuring rule 4 and knowing the position of the float 1.

[21] The servo level gauge further comprises a contact electrode 3, the contact electrode 3 is annular, and the measuring rule 4 passes through the central hole of the contact electrode 3.

[22] The float 1 is provided with measuring elements such as a temperature sensor 9, a pressure sensor 10, and an interface sensor 11, a working circuit is arranged in the float 1, a power circuit is connected to the working circuit, and a contact 2 is arranged on the housing of the float 1. The contact 2 is connected to the power supply circuit; when the float 1 moves up and down, the contact electrode 3 can be in contact with or disconnected from the contact 2. The contact electrode 3 is connected to the liquid level monitor main board, and a charging unit and a voltage detecting unit are connected through the liquid level monitor main board, and the voltage of the power supply circuit can be detected, and the power supply circuit is charged according to the detection result.

[23] The contact 2 is also connected to the working circuit. When the contact electrode 3 is in contact with the contact 2, the working circuit can exchange information with the outside through the contact 2 and the contact electrode 3; the "external" here can be a servo liquid level The control unit or the level gauge main board can also be other control systems; the information interaction can be two-way interaction, the data stored in the working circuit can be sent to the outside, and the external control commands can also be sent to the working circuit. [24] The measuring ruler 4 can be connected to the power ground in the float as a common ground. When the contact 2 is in contact with the contact electrode 3, the contact 2 and the measuring rule 4 form a circuit loop, and the working circuit and the power supply circuit can pass the measuring rule 4 Ground.

[25] The contacts 2 are provided on the upper portion of the float housing, and may have one or more, preferably two.

[26] As shown in FIG. 2, the specific power supply circuit includes an energy storage component and a power conversion module. The working circuit includes an intelligent data collection module CPU and a measurement component, and the intelligent data collection module CPU and the measurement component can be powered by the energy storage component. It can also be powered by the power conversion module.

[27] In a specific embodiment, the energy storage component may be a capacitor, a disposable battery or a rechargeable battery, and the intelligent data collection module CPU may be powered by the energy storage component; the power conversion module may be a measurement component according to the voltage requirement of the measurement component. Power supply, intelligent data collection module CPU can control the power conversion module and measurement components.

[28] The measuring element may comprise at least one element such as a temperature sensor, a pressure sensor, an interface sensor, etc., and may also comprise other measuring elements.

[29] The external connection end of the power circuit is provided with a diode. The anode of the diode faces the power supply circuit. When the working circuit interacts with the outside, it avoids interference from the power circuit and prevents the voltage of the power circuit from being released.

[30] In the present invention, after the contact electrode contacts the contact of the float, the voltage detecting unit determines the contact voltage, and when the voltage is low, the charging unit charges the energy storage element in the float, and the charging is performed through the contact, when the charging voltage is reached. The specified value 吋, the control unit sends a collection command to the intelligent data collection module CPU in the float through the contact, and according to the command of the control unit, the intelligent data collection module CPU performs the collection operation through the measurement component

, and store the data in its own memory. When the collection is finished, the servo level gauge lifts the float to the position where the contact contacts the contact electrode through the stepping motor, and reads the stored data in the float. The control unit processes and obtains the corresponding results. Easy to use, stable working voltage and accurate measurement.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of within the technical scope disclosed by the present invention. Changes or substitutions are intended to be included within the scope of the invention.

Claims

Claim

[1] A servo type liquid level gauge, comprising a float, wherein the float is provided with a working circuit, wherein the working circuit is connected with a power supply circuit, and a cover of the float is provided with a contact, a contact is connected to the power circuit;

The servo type liquid level gauge further includes a contact electrode, wherein the contact electrode is in contact with or disconnected from the contact, the contact electrode is connected to the liquid level gauge main board, and the charging unit is connected through the liquid level gauge main board Voltage detection unit.

[2] The servo type liquid level gauge according to claim 1, wherein the contact is connected to the working circuit, and the working circuit exchanges information with the outside through the contact and the contact electrode.

[3] The servo type liquid level gauge according to claim 2, wherein the power supply circuit comprises an energy storage element and a power conversion module.

[4] The servo-type liquid level gauge according to claim 3, wherein the working circuit comprises an intelligent data collection module CPU and a measuring component, and the energy storage component is coupled to the intelligent data collection module CP u Powering, the energy storage component is a capacitor or a rechargeable battery; the power conversion module supplies power to the measurement component, and the intelligent data collection module CPU sends a control signal to the power conversion module and the measurement component.

[5] The servo type liquid level gauge according to claim 4, wherein the measuring element comprises at least one of the following: a temperature sensor, a pressure sensor, and an interface sensor.

[6] The servo type liquid level gauge according to claim 1, wherein the float is connected to a driven wheel of the servo level gauge by a measuring ruler, and the contact electrode is annular, A measuring ruler passes through the center hole of the contact electrode, and the contact is provided at an upper portion of the housing.

[7] The servo type liquid level gauge according to claim 1 or 6, wherein the contact has one or more.

[8] The servo type liquid level gauge according to claim 6, wherein the servo type liquid level gauge further comprises a photoelectric collecting element for collecting height information of the measuring rule.

[9] The servo type liquid level gauge according to claim 6, wherein the working circuit and the power supply circuit are grounded through the measuring ruler.

[10] The servo level gauge according to claim 1, wherein the external connection of the power circuit a diode is disposed at the end, and a cathode of the diode faces the power circuit