CN2241881Y

CN2241881Y - Built-in total immersion float-type liquid density measuring instrument

Info

Publication number: CN2241881Y
Application number: CN 95231841
Authority: CN
Inventors: 刘玉德
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-01
Filing date: 1995-08-01
Publication date: 1996-12-04
Anticipated expiration: 2005-08-01

Abstract

The utility model relates to a built-in total immersion float-typed liquid density measuring instrument, comprising a float and a sensor which is assembled with the float together, wherein, the float which is totally immersed in the liquid is assembled with the straining piece type sensor together, is fixed by a support seat, and is isolated by a protecting sieve. The conducting wire of the sensor which is used for transmitting the electric signal is led out from the conducting wire hole of the support seat. The utility model has the advantages of compact structure, no influence by the liquid characteristic, and high measuring precision, and is suitable for the industrial high precision on-line measurement.

Description

Internally-arranged type soaks the float-type liquid density measurement entirely

The utility model relates to a kind of device that is used for liquid density measurement, and particularly a kind of internally-arranged type that is used for the fluid density high precision online measuring soaks the float-type liquid density measurement entirely.

At present, the device that is used for liquid density measurement has many kinds.Commonly used have float rod type structure, little differential structure, heavy body formula structure or a ultrasonic type structure etc.Wherein the float rod type structure is to adopt the fly rod that vertically floats on liquid surface, on the fly rod scale, directly read density of liquid, though this structure is simple, its liquid body proterties, influence as viscosity, level fluctuation etc. is bigger, and measurement sensitivity is low, error big, poor repeatability; Little differential structure is at level altitude fluid column two ends output pressure reduction, by pressure transducer pressure reduction is converted into electric signal output, but its range is little, resolution is low, error is also bigger; Heavy body formula structure is that the heavy body that will be dipped in entirely in the liquid links to each other with LOAD CELLS on the liquid level through transmission rod (or silk thread), the variable density that heavy body is experienced, pass on the sensor through liquid level, produce corresponding electric signal, the range of its measurement, the equal liquid body affect trait of the scope of application are unsuitable for high precision online measuring; And the ultrasonic type structure is by measurement ultrasound wave velocity of sound in liquid, comes indirect calculation to obtain fluid density, and it is higher that it measures sensitivity, however the cost height, poor repeatability, the linearity is low, is unfavorable for promoting.

The purpose of this utility model provides a kind of internally-arranged type and soaks the float-type liquid density measurement entirely, its compact conformation, and the liquid body affect trait is not applied widely, and the measuring accuracy height is suitable for industrial high precision online measuring.

The purpose of this utility model is achieved in that this device comprises float and the sensor that fits together with float, the float and the strain-gauge transducer that wherein are dipped in entirely in the liquid fit together, fix with bearing, isolate with the protection screen cloth, the lead of sensor transmissions electric signal is by deriving in the bearing wire guide.

Because the type float is soaked in the utility model employing entirely and electrostrictive strain formula sensor groups is dressed up one, so compare with measuring instruments such as existing float rod type structures, obviously reduce additional drag, the not influence of liquid body proterties, can effectively utilize resistive element tested physical quantity, variation as power, displacement equivalent converts electric signal output to, thereby the realization high precision is measured at survey line.Has advantage applied widely, highly sensitive, that significantly improve measuring accuracy.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is a kind of concrete structure synoptic diagram of the utility model.

Fig. 2 float top load arrangement synoptic diagram.

Fig. 3 is a float underneath type structural representation.

Fig. 4 is a float group formula structural representation.

Fig. 5 is the cut-open view of Fig. 4 along the A-A line.

Fig. 6 is the cut-open view of Fig. 4 along the B-B line.

Describe concrete structure of the present utility model in detail according to Fig. 1-6.Parts such as the strain-gauge transducer 7 that this device comprises float (or float group) 5, installing plate 1 (or cover body 9 is installed), has the bearing 2 of wire guide 3, fit together by bearing 2 and float 5, corrugated tube 8.The installing plate 1 that wherein is processed with mounting hole can be packed in this device in the pipeline or container of fluid to be measured, also can utilize installation cover body 9 that the liquid in-out mouth 10,11 of this device is communicated with the pipeline or the container of fluid to be measured, realizes on-line measurement.Bearing 2 utilizes set nut 4 to be packed in installing plate 1 or installs on cover body 9 sidewalls.Constitute strain-gauge transducer 7 by foil gauge and elastic sensing element, and with corrugated tube 8 encapsulation.Float 5 can be processed into hollow or solid cursory, is dipped in the liquid entirely.It fits together by bearing 2 and strain-gauge transducer 7, isolates with protection screen cloth 6.When measuring, can avoid liquid directly to impact.The shape of screen cloth 6 and specification can be made according to actual needs as shapes such as Fig. 1, Fig. 2, Fig. 3, Fig. 4.Float 5 can be directly and the elastic sensing element of strain-gauge transducer 7 join (as shown in Figure 1).Also can will be fixed with the float 5 of force-guided stem 14, it is spacing to utilize support 12 to carry out, and along the moving axially of force-guided stem 14, float 5 is joined shown in (as Fig. 2,3) by the elastic sensing element of force-guided stem 14 with strain-gauge transducer 7.For preventing that overload from can add limiting bracket 13.Also can in cover body 9 is installed, be set communicating pipe 15 for eliminating additonal pressure, with the pressure of balance in it.Be processed with filling orifice with cover 16 on installation cover body 1 top.Also can make force-guided stem 14 other ends that are fixed with float 5 that displacer 17 is set, constitute the float group, utilize the elastic sensing element of part that its force-guided stem 14 encapsulated by corrugated tube 8 and strain-gauge transducer 7 to join.The lead of strain-gauge transducer 7 transmission signals joins with control instrument by deriving in the hold-down support wire guide 3, can obtain the change in electric that the variation of measurand converts to, thereby reaches the purpose of measuring fluid density by the measurement to electric signal.

During use, this device is packed in the pipeline or container of fluid to be measured, also can utilizes installation cover body 9 that the liquid inlet and outlet 10,11 of this device is connected with the pipeline or the container of fluid to be measured with installing plate 1.During liquid density variation, the suffered buoyancy generation of float respective change, and convert corresponding change in electric to by strain-gauge transducer 7.By the corresponding fluid density value that measures to electric signal.

Claims

1, a kind of internally-arranged type soaks the float-type liquid density measurement entirely, comprise float and the sensor that fits together with float, the float and the strain-gauge transducer that it is characterized in that being dipped in entirely in the liquid fit together, fix with bearing, isolate with the protection screen cloth, the lead of sensor transmissions electric signal is by deriving in the bearing wire guide.

2, measuring instrument according to claim 1 is characterized in that foil gauge and elastic sensing element in the strain-gauge transducer, all encapsulates with corrugated tube.

3, measuring instrument according to claim 1, it is spacing that the float that it is characterized in that being fixed with force-guided stem utilizes support to carry out, and moving axially along force-guided stem.

4, measuring instrument according to claim 1 is characterized in that the force-guided stem other end that is fixed with float is provided with displacer, constitutes the float group.