CN2185890Y - Digital display type liquid densimeter - Google Patents

Abstract

The utility model relates to a special digital instrument for measuring fluid density, and the densitometer is composed of a sensor barn, an electronic circuit barn, a numeration meter, etc. The utility model can measure the density of various liquid such as acid, alkalis and salt with only a little liquid (about 5 ml), so the utility model has convenient operation and overcomes the disadvantages of easy damaged and large error of a glass float type densitometer. Therefore, the utility model eliminates operators' reading error, and the reading precision can reach 0.001g/cm< 3 >.

Description

Digital display type liquid densimeter

The utility model relates to a kind of liquid density measurement table, and particularly a kind of liquid sucks, static measurement, and numeral shows that numerical value is liquidensitometer intuitively, is suitable for various density of liquid are measured.

Existing fluid density degree all adopts the glass ball float formula.Its structure is as follows, and glass ball float is put into fluid to be measured or fluid to be measured is sucked a glass tube, and float is subjected to buoyancy of liquid and floats.Fluid density difference, the degree of float emersion liquid level are also different, thereby the corresponding liquid density value can be read by the scale place of corresponding liquid level on float.This densitometer exists following shortcoming:

A: low precision.General this densitometric scale division value is 0.005g/cm ³, or 0.001/cm ³G.

B: easily broken.This density degree is made for glass as thin as a wafer, and is fragile, also is to cause the inaccurate factor of measuring.

C: error is big.The professional technique that its action need is certain.Particularly liquid is sucked when measuring in the glass tube, its float emersion degree and density readout and operator's method of operating, number reading method is relevant, to the liquid of same density, different operating person, the numerical value difference that often records.

D: required liquid measure is more during measurement.Floating of float needs certain liquid measure, and the liquid measure of fluid to be measured can not satisfy float and floats needed liquid measure in many cases, thereby can not measure, as measures small-sized lead-acid accumulator.

Above float type densimeter brings many inconvenience to liquid measure, makes the measurement of some fluid densities difficulty take place and produce bigger numerical error, thus the judgement that must make mistake.

Task of the present utility model is that a kind of digital display type liquidensitometer will be provided.The density that only needs liquid measure (about 5ml) seldom just can directly read fluid to be measured easily, exactly in digital watch, this instrument is easy and simple to handle simultaneously, is easy to grasp, has overcome the flimsy shortcoming of glass ball float.Eliminated operator's reading error, reading accuracy can reach 0.001g/cm ³

The utility model is finished as follows: densitometer is by the liquid storehouse, and several parts such as sensor storehouse, circuit storehouse and digital watch are formed.Upper and lower, liquid storehouse is installed rubber ball and plastic tube respectively, and a plastic float is installed in the storehouse, a force sensing element is installed in the sensor storehouse is done density sensor, realizes the conversion between physical quantity and the electric weight.Sensor in the sensor storehouse links to each other with the thin axle of U-shaped that the float in the liquid storehouse is made with an anticorrosive material, be with Sealed casing pipe on the thin axle of U-shaped, and pass dividing plate between liquid storehouse and the sensor storehouse, dividing plate cuts off fluid to be measured in the liquid storehouse, and can not enter the sensor storehouse with the rotation of axle, the other end of sensor is bonded on the base plate in sensor storehouse.Circuit is equipped with electronic devices and components in the storehouse, and the electric signal that sensor is faint amplifies the back and supplies with digital watch.Digital watch is the device that density shows.

The hand-held rubber ball of operator sucks liquid in the liquid storehouse during use, float in the liquid storehouse, under the effect of liquid buoyancy, produce certain buoyancy, density of liquid is big more, and its buoyancy is also just big more, and the axle that links to each other with float is done axially with float and rotatablely moved, thereby drive the force-sensing sensor in the sensor storehouse, make the magnitude of voltage generation respective change that is added on the force-sensing sensor.The voltage of this variation and buoyancy are linear substantially, and its non-linear electronic circuit that can utilize is proofreaied and correct.

The utility model only needs liquid (about 5ml) seldom just can measure acid, alkali, the various density of liquid of salt, and this instrument is easy and simple to handle, and it is fragile to have overcome glass ball float formula densitometer, the shortcoming that error is big.Eliminated operator's reading error, reading accuracy can reach 0.001g/cm ³

Below in conjunction with drawings and Examples the utility model is further specified:

Accompanying drawing 1 is a structural drawing of the present utility model.

Accompanying drawing 2 is that the A-A of Fig. 1 is to cut-open view.

Accompanying drawing 3 is circuit theory diagrams of the present utility model.

Among the figure: 1,31/2 LCD digital watch, 2, zero potentiometer, 3, power switch, 4, circuit board, 5, housing, 6, battery 7, rubber ball, 8, float, 9, force-sensing sensor, 10, the liquid storehouse, 11, plastic tube, 12, sensor storehouse, 13, the thin axle of U-shaped, 14, dividing plate, 15, aperture, 16, Sealed casing pipe.

With reference to Fig. 1,31/2 LCD digital watch (1) is installed on the shell (5) of liquidensitometer, the maximum readout of 31/2 figure place word table (1) is 1.999 here, has comprised the liquid-sulfuric acid 1.84g/cm of common maximal density fully ³Scope.The cavity shape that shell adopts the plastics injection to form has certain mechanical strength and resistance to acids and bases, and shell one end is installed digital watch, electronic component is installed in the chamber is formed the circuit storehouse.Be divided into two cavitys that do not communicate in the housing lower end with dividing plate 14, one is liquid storehouse 10, one is sensor storehouse 12, one aperture 15 is arranged on the dividing plate 14, the thin axle 13 of U-shaped passes from this hole, one end is bonded on the float 8 in the liquid storehouse, force-sensing sensor 9 riveted joints in the other end and sensor storehouse, and the other end of sensor 9 is bonded on the base plate in sensor storehouse.For anti-sealing enters the sensor storehouse from the liquid storehouse, be with a Sealed casing pipe 16(on the thin axle of U-shaped and see Fig. 2).

Be separately installed with rubber ball (7) and plastic tube (11) in the top and bottom in liquid storehouse.Zero potentiometer (2) is installed on shell (5), before carrying out density measure, densitometer can be sucked water earlier, adjust this potentiometer, making the displayed value of digital watch (1) is 1.000, reaches the purpose of the accuracy of calibration liquidensitometer at any time.Potentiometer (2) should adopt thick close multiturn potentiometer, adjusts more conveniently, can improve measuring accuracy greatly.Power switch (3) is connected working power for this instrument, adopts and touches moving switch, can make operator's good hand touch, turn-offs this switch saves energy but measure to finish.Circuit board (4) is installed in the housing (5), and faint electric signal is amplified, and drives digital watch (1).Amplifier in the circuit board (4) should have higher gain, lower error, good temperature characterisitic.Battery (6) is-9V side's battery that rubber ball (7) is the device that fluid to be measured is picked up.The operator discharges the air in the rubber ball (7), just fluid to be measured can be sucked in the liquid storehouse (10) after raising one's hand, float (8) upwards floats under the effect of liquid buoyancy, the thin axle (13) that links to each other with float (8) is done axially and is rotatablely moved, the force-sensing sensor (9) that drives in the sensor storehouse (12) is done displacement movement, thereby produce the change in voltage △ V of certain numerical value, the buoyancy of this △ V and buoyancy is directly proportional, △ V send digital watch (1) to show that the operator just can directly read density value on digital watch (1) after amplifier (4) amplification and calibration.

Float (8) in the liquid storehouse (10) and the sensor (2) in sensor storehouse (12) are separately positioned in two storehouses, sensor can avoid having the corrosion of corrosive liquids on the one hand, make sensor avoid damaging, can avoid on the other hand causing the error of certain measurement because the temperature of liquid exerts an influence to sensor voltage △ V.

Claims (1)

1, a kind of digital display type liquidensitometer, by the liquid storehouse, sensor storehouse, circuit storehouse and digital watch are formed, it is characterized in that: upper and lower, liquid storehouse is installed rubber ball and plastic tube respectively, a plastic float is installed in the storehouse, the sensor that one force sensing element is done is installed in the sensor storehouse, sensor in the sensor storehouse links to each other with the thin axle of U-shaped that the float in the liquid storehouse is made with an anticorrosive material, be with Sealed casing pipe on the thin axle of U-shaped, and passing dividing plate between liquid storehouse and the sensor storehouse, the other end of sensor is bonded on the base plate in sensor storehouse.

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