CN2061275U - Inductance type float tank gage - Google Patents

Abstract

The utility model provides an inductance type float tank gage suitable for continuous precise detection which adopts a plurality of segments of induction windings interlapped with each other and a high permeability float and is matched with a micro-computer to carry out the circuit measurement to the variation of the inductance value-liquid level value in the windings. The resolution can reach to 0.1 mm, and the utility model has the advantages of high precision, low conformance requirement to the coil, simple measuring circuit, convenient adjustment and low cost. If a connected vessel is changed into a taper, the float is changed into the corresponding shape, and the displacement of the computer is changed into the flow detection, the utility model can became an inductance type digital rotor flow meter.

Description

Inductance type float tank gage

The utility model relates to a kind of improved inductance type float level meter, is specially adapted to the variation that continuous precision detects liquid level.

In all kinds of liquid level gauge of existing measurement and demonstration liquid level change, the inductance type float level meter is to change to determine liquid level change by the inductance value of measuring an inductance winding.When the magnetic core in the telefault stretched into the degree of depth (being that core axis is to producing displacement) of winding along winding axis, inductance value also changed thereupon.A kind of " condensate tank of dehumidifier (the clear 60-2312 of Jp) " of Japan utilizes magnetic float to come in and go out in this coil along with the lifting of liquid level and carries out sensed water level, because magnetic float is corresponding to the position difference of coil, the inductance value size of coil is also different, thereby the variation that detects inductance value by relevant metering circuit is to measure the variation of water level.But, this device is because its length is subjected to the restriction of magnetic float size, cannot do longlyer, so its measurement range is just narrow, particularly the correlation curve of its inductance value L and displacement amount H exists severe nonlinear at initial latter end and peak value section, in order to calculate accurately, can only use the linearity range of center section, this has just further limited its measurement range again.In addition, (Qin Yonglie work in " thing letter measurement instrument " book of China, China Machine Press publishes in January, 1978), introduction is with the stacked method with range extension of a plurality of inductance strings, it is to belong to a position to show character that magnetic float enters the signal that each coil sends, can not change the inductance value in each coil and show continuously, though can do each coil shortly as much as possible, in the hope of meticulous reading value, but its resolution characteristic and degree of accuracy are still very limited, can't resolve 1mm following resolution and precision.

The objective of the invention is to avoid above-mentioned technical deficiency part and the winding of the overlapped formula of a kind of more piece, the inductance type float level meter that the configuration microcomputer technology detects be provided, in order to raising resolution characteristic and precision and increase measurement range, and can realize measuring automatically and automatic printing measurement result.

Task of the present invention is finished by following manner: a kind of more piece, overlapped inductance winding (1) are set, adopt high permeability material to make float (2), inductance value changes in the touring measurement of the adapted microcomputer winding, just can solve the nonlinear problem of inductance value-displacement curve with simple circuit, measurement range is expanded continuously.Each winding is made lack highly as far as possible cylindrical, and divide about layer by a constant pitch, adjacent winding is that the corresponding dislocation of ectonexine is overlapping, the L-H curve of each winding is crossed one another, and its linearity range partly overlaps, by micro processor controls, each winding is inserted Franklin's oscillation circuit successively, by means of the variation of the method inductance measuring amount of measuring oscillation frequency, determine float position, show and export corresponding level value or flow value.Change float shape and linker be Taper Pipe shape and in computer program, displacement changed into corresponding flow value after, the present invention just becomes inductance type numeral spinner-type flowmeter.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing.

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

Fig. 2 is the L-H curve of single winding.

Fig. 3 is that the L-H of dual winding construction changes curve.

Fig. 4 is a measuring circuit block diagram of the present utility model.

With reference to Fig. 1, dual lap winding (1) is to be wound on the bakelite matter frame (4) with the QZ0.25 enameled wire, the internal diameter of winding be 10.8mm earlier with a winding A around 3 layers, every layer 30 circle, the end of a thread is kept here, be right after it down just again around next B winding, also around 3 layers, every layer 30 circle is kept the end of a thread here, again the end of a thread of winding A in B winding outside around 3 layers, and then every layer 30 circle remakes winding C below the winding B, again with the Lower Half of the B winding first half outside around C, so like this analogize, just constituted the dual lap winding of inductance (1) structure.Support (5) is communicated with highlands such as fluid reservoirs by pipeline, the float made from high permeability material MXD-2000 or MXO-2000 (2) moves up and down along with the lifting of liquid level (or liquid measure) in linker (3) and passes each winding, when it enters some windings, the inductance value of this winding can change, also promptly represent the variation of liquid level amount, formed curve shown in Figure 2.Demonstrate beginning among Fig. 2 and exist the severe nonlinear problem with latter end, have only interlude partly to meet linear rule, since the present invention with two parts up and down of this winding respectively with overlapping the drawing of upper semisection of the lower semisection and the next winding of a last winding, so its L-H curve is respectively with last, the interlaced half pitch of L-H curve of following two windings, under several overlapped situations of winding of arranging like this, their L-H curve just crosses one another, and is found out in whole liquid level change scope by the linearity range of each curve shown in Fig. 3 centre to overlap.Fig. 4 shows the working condition of measuring circuit, with the touring inductance value of measuring each winding of microcomputer, it is inserted Franklin's oscillation circuit, and oscillation circuit becomes inductance value into oscillator signal output.A crystal oscillator, frequency dividing circuit provide the time value of a standard, and the counter meter has descended the vibration cycle (being frequency values) through shaping in this standard time to send in the computing machine and compared.Here, having changed digital quantity-frequency values into the quantitative change of the corresponding continually varying winding inductance of magnetic float displacement.Computing machine is found out that winding of oscillation frequency minimum (being the inductance value maximum) again according to the instruction of program, just corresponding to the winding of magnetic float, again according to its position in the L-H curve linear section that overlaps, frequency values is converted into mutual displacement to be shown on screen or prints, also can draw out relative curve automatically, can also signal be exported to other control microcomputer by interface circuit, to control relevant process.

The utility model advantage is: when going the rounds to detect the variation of each winding electric sensibility reciprocal with microprocessor, just can only use those linearity range numerical value, the precision of measuring so just can improve greatly. Want to give enlarge measurement range, only need to increase the number of winding, owing to be to use the microcomputer Sample by make rounds, even the number of winding is a lot, Also can finish one in a few tens of milliseconds and take turns detection, this just forms its measurement category almost can infinite expanding. The winding of lacking as far as possible and the magnetic float of high permeability, its resolution ratio also is greatly improved. Adopt linear interpolation to improve resolution ratio, reached at present the resolution ratio of 0.1mm, use numeral to show and have the interface circuit can be online with computer automation testing and control system, and low to the coherence request of coil, this magnetic float machining accuracy requires low than differential transformation magnetic core, relevant measurement circuitry is simple, and is easy to adjust, thereby cost is low.

Claims (3)

1, a kind of inductance type float level meter of forming by inductance winding, magnetic float, tubular linker, test circuit, it is characterized in that: inductance winding (1) is more piece, overlapped formula structure, the float of high permeability (2), the touring microcomputer of measuring the winding inductance quantitative changeization of adapted.

2, inductance type float level meter according to claim 1, it is characterized in that each short highly as far as possible columniform winding makes two parts, half is at nexine, half is at skin, overlapping by a constant pitch, the latter half that is the first half of each winding and last winding is overlapping, and the latter half is overlapping with the first half of other next winding

3, inductance type float level meter according to claim 1 and 2 is characterized in that linker (3) is made as Taper Pipe shape, and corresponding change float shape transforms the detection of the displacement in the computing machine into flow value, is inductance type numeral spinner-type flowmeter.

Images