CN2050587U

CN2050587U - Displacement sensor

Info

Publication number: CN2050587U
Application number: CN 89209261
Authority: CN
Inventors: 王德盛
Original assignee: AIR FORCE ENGINEERING DESIGN RESEARCH BUREAU PLA
Current assignee: AIR FORCE ENGINEERING DESIGN RESEARCH BUREAU PLA
Priority date: 1989-07-04
Filing date: 1989-07-04
Publication date: 1990-01-03

Abstract

The utility model provides a displacement sensor, which adopts the principle of frequency modulation with electrical inductance. The utility model is characterized in that CMOS oscillation circuit integrated blocks; a guide rod adopts a soft-magnetic alloy which has the functions of proof corrosion, high elasticity, and high magnetic conductivity; the fame of a coil adopts insulation materials with small temperature factors; meanwhile, the shapes of the frame of the coil and a casing are changed, and a seal ring and solidifiable glue are used; the sensitivity stability of the sensor are improved, and the seal of the utility model is tight. The displacement sensor is suitable for the measurement of the displacement in water or in other liquids.

Description

Displacement sensor

The utility model belongs to displacement measuring device.

Nineteen eighty-three, the present utility model people has invented a kind of inductance fm formula displacement transducer, and publishes in " sensing technology complete works " the 14th fascicle " displacement, length, angle and speed pickup " book that Hubei science tech publishing house publishes in Dec, 1985.This sensor is with B-ZD ₈Frequency-modulated generator, resonant capacitance and inductance type sensing unit attach together in a housing, form a L-C oscillatory circuit jointly.Be characterized in: the output FM signal, amplitude is big, and is anti-interference, and measuring accuracy is not subjected to supply voltage quality and transmission cable length and Effect on Performance, need not the A/D conversion with the supporting use of computing machine, helps improving precision and reduces cost.But this sensor is poorly sealed close, can not be used under water or other liquid in measure, having much room for improvement aspect stability, sensitivity, precision and the corrosion resistance simultaneously.

The purpose of this utility model be obtain that a kind of performance is more stable, sensitivity and precision be higher, fully closed inductance fm formula displacement transducer is to be applicable to the measurement of the sound attitude displacement in water and other liquid.

Housing of the present utility model is divided into conduit, barrel shell and bonnet three parts, connects by threaded engagement, both has been convenient to the processing of housing, is convenient to the assembling of electronic component and annex again.The central dividing plate that has central small hole in the barrel shell is divided into two chambers with it, and a chamber is placed with shaped framework coil, and another chamber is put integrated circuit block and electric capacity.Coil rack adopts the little insulating material of temperature coefficient, manufactures as fluoroplastic, polysulfone resin or nylon etc., has improved the corrosion resistance of sensor, and temperature influence is less.The openend of coil rack, periphery have screw thread and ring groove, other end sealing atresia.Put O-ring seal in the conduit and in the bonnet center pit, the screw thread place is coated with curable glue, and sealed waterproof effect is good, can be used for Displacement Measurement in water or other liquid.The utility model has also adopted CMOS oscillatory circuit integrated package, makes sensor bulk littler, and power consumption still less, and is stable better.Adopt novel magnetically soft alloy simultaneously, make guide rod, the corrosion resistance and the sensitivity that have improved sensor as CD-2.Guide rod one end end is processed into hemispherical, makes guide rod flexible with contacting of measured object.

The utility model accompanying drawing:

Fig. 1. the utility model displacement transducer

Fig. 2. the utility model displacement transducer circuit connects block diagram

Enforcement of the present utility model:

Fig. 1 is the cut-open view of the utility model displacement transducer (1).

Coil (2) is on skeleton (3), and coil winds back dipping lacquer, sealing, baking, aging, stores stand-by.From guide rod (4) butt end cover upper spring (5), hemispherical end is inserted in the center pit (7) of conduit (6)." O " shape rubber ring (8) is put into the Gewindefreistiche (9) of conduit (6), and the screw thread with conduit (6) and skeleton (3) is coated with gluing then, and skeleton (3) is screwed in the conduit (6) till compressing round section joint ring (8).In the screw thread of the ring groove (10) of skeleton (3) and skeleton (3), fill up glue, coil (2) barrel shell (11) of packing into, and the extension line (12) that makes coil passes the center pit (14) of dividing plate (13), then the screw thread of barrel shell (11) and skeleton (3) is tightened and obturaged, oscillatory circuit integrated package (15), electric capacity (16) are placed on cavity (17) lining of barrel shell (11).Lead-out wires of coil (12) and cable (19) connect into the L-C oscillatory circuit by Fig. 2, after temperature compensated and performance adjustment is qualified, integrated package (15), electric capacity (16) are fixed, again cable (19) is passed successively bonnet (20), " O " shape rubber ring (21) and line ball hollow screw (22).Space and screw thread screw thread in the cavity (17) of barrel shell (11) are filled curable glue, tighten bonnet (20) and screw (22) successively, after handling by the requirement of glue curing process, carry out water pressure resistance test and Performance Detection.

Claims

1, a kind of displacement transducer comprises electric capacity (16), it is characterized in that: housing is divided into barrel shell (11), conduit (6) and bonnet (20) three parts; The central dividing plate (13) that has central small hole in the barrel shell (11) is divided into two chambers with it, and one install coil (2) adorn CMOS oscillatory circuit integrated package and electric capacity for one; Semisphere is processed in guide rod (4) one end ends; Be with spring (5) on the guide rod; Coil (2) has skeleton (3), and skeleton openend periphery has screw thread and sealing ring groove (10), other end sealing; In conduit (6) and bonnet (20) center pit " O " shape O-ring seal (8) and (21) are housed respectively.

2, press the described displacement transducer of cane ɡ  , it is characterized in that coil rack (3) adopts insulating material such as fluoroplastic, polysulfone resin or nylon etc. to manufacture.

3,, it is characterized in that guide rod (4) adopts magnetically soft alloy such as CD-2 to manufacture according to claim 1 and 2 described displacement transducers.