CN2090994U

CN2090994U - Zd model sensor for rainfall

Info

Publication number: CN2090994U
Application number: CN 91209111
Authority: CN
Inventors: 张一夫
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-06-01
Filing date: 1991-06-01
Publication date: 1991-12-18

Abstract

The utility model relates to a ZD model sensor for rainfall which is composed of a probe head and a control circuit. The probe head is composed of a pectinate electrode A (vibrating electrode) and a pectinate electrode B (stationary electrode), the comb dents of the electrode A and the comb dents of the electrode A are alternatively ranged on a same plane surface, and the underside of the electrode A is provided with an electromagnet. When rain falls, the electrode A and the electrode B are connected by a raindrop astride between the electrode A and the electrode B to make the control circuit conducted, the electrode A is attracted downwards by the electromagnet, the raindrop is drawn to break, and the electric circuit is cut off; depending on elasticity, the electrode A is vibrated upwards and downwards to shake off residual water beads, and is rapidly restored to a raw condition. When the electric power is switched on once, a rainfall signal is generated. The control circuit is provided with a selection switch for sensitivity and delay time, and whether the rain falls or stops is judged according to the preset values of the sensitivity and delay time. The utility model has the advantages of strong rainfall recognizing ability, simple structure, low cost, small power consumption, etc.

Description

ZD model sensor for rainfall

The utility model ZD type precipitation sensor belongs to the precipitation measurement mechanism.

Precipitation sensor is mainly used in the beginning and the termination of measuring precipitation.The precipitation sensor that generally uses both at home and abroad has two kinds at present: a kind of is netted sensor; A kind of is rotating detector.Netted sensor is to be made of the comb electrode that is fixed in broach two mutually insulateds alternately on the same plane, raindrop drop on when top, and cross-over connection constitutes power circuit in the two poles of the earth, produce the signal of " rainy ", the start-up control system opens the sampling thief top cover, begins sampling; After rain stopped, water droplet was heated evaporation, and the two poles of the earth outage produces " rain stops " signal, and control system is closed top cover, protects sample thief.The time-lag that this sensor " rain stops " signal stops than actual rain was unfavorable for protecting sample thief more than 30 minutes, and in addition, the damp mass that resembles mist, dew even fall thereon all can produce the illusion of having rained.Rotating detector is that interior disk by the motor-driven high speed rotating is as a utmost point, and quiet two electrodes formations that motionless outer toroid as another utmost point, when raindrop drop on the disk, because the centrifugal force that the interior disk of rotation produces gets rid of raindrop to its edge, disk and outer toroid the two poles of the earth and conducting loop in the cross-over connection during disk border in raindrop arrive, and be cut off rapidly again, produce a pulse signal, and judge whether according to the unit interval umber of pulse that sets in advance by operation circuit rainy, thereby got rid of non-precipitation interference such as mist, dew.This sensor power consumption big (15 watts of powers of motor), the cost height, complex structure is measured insensitive to snowfall.

The purpose of this utility model is to provide a kind of cost low, and power consumption is little, measures accurate, the easy to use oscillatory type comb electrodes sensor of rain time.

The utility model ZD type precipitation sensor is made up of probe and operation circuit two parts, and its probe is made of the comb electrode of two mutually insulateds, promptly decides utmost point B and vibration utmost point A, and broach alternately at grade.One end (outer end) at A, B the two poles of the earth is fixed on the support, and the other end can up-down vibration.An electromagnet is arranged at A below extremely, when precipitation, raindrop cross-over connection A, B the two poles of the earth of dropping on the probe make the loop conducting, produce a pulse signal of representing raindrop; Electromagnet attracts A once extremely downwards simultaneously, and cross-over connection is broken in the globule of A, the B utmost point, makes the loop outage.The A utmost point produces upper and lower vibration because of the elasticity of self, shakes off the residual globule and very fast reinstatement, and A, the B utmost point are in not on-state again.Such raindrop produce a pulse signal, and the signal accumulative total that raindrop produce in the unit interval is proportionate with precipitation intensity.Because the elastic vibration of the A utmost point can be shaked off raindrop very soon, as soon as rain stops promptly not producing signal.Operation circuit has counting, logical process and three kinds of functions of power drives, the pulse signal that probe is produced adds up, and according to the Sensitirity va1ue that presets and after time delay of presetting carrying out logical process, the control power drives partially opens (closing) rainfall sampler.

ZD type precipitation sensor identification precipitation ability is strong, and is responsive too to snowfall, has simple in structurely, and cost is low, and volume is little, is fit to continuous working under the field condition, and power consumption is little.

Fig. 1 is a ZD type precipitation sensor probe planimetric map;

Fig. 2 is a ZD type precipitation sensor schematic diagram of structure; Wherein: 1 is A, the B utmost point; 2 is protection network; 3 is soft iron; 4 is shell; 5 is A utmost point insulating support; 6 is base plate; 7 is electromagnet; 8 positions when being attracted for the A utmost point; 9 is rain cover, interior dress operation circuit; 10 is well heater, adds rain cover 11; 12 is B utmost point insulating support.

Fig. 3 is ZD type precipitation sensor operation circuit figure.

Provide an embodiment of ZD type precipitation sensor below, the probe of this sensor constitutes (Fig. 1) by two comb electrode A, B.The useful area 40-80cm in the alternate district of broach ², B utmost point facewidth 0.5-0.75mm, A utmost point facewidth 0.75-1.0mm, the gap 0.5-0.75mm of A, B the two poles of the earth broach is equally distributed basically.A, B electrode adopt the thick beryllium-bronze material of 0.2mm.A, the B utmost point (1) broach be (Fig. 2) alternately at grade, and an end (outer end) at the two poles of the earth is fixed on A, B utmost point insulating support (5) and (12), keeps insulation.The A utmost point other end can up-down vibration, an electromagnet (7) is installed at A below extremely, and around 4000 circles, the line bag is placed in the aluminum pipe and the filling gel sealing line bag with φ 0.13mm enameled wire, and (3) unshakable in one's determination are with φ 10mm electrician soft iron, 10-15 ° of workplace inclination.After electromagnet (7) energising, the A utmost point is attracted downwards, and after the electromagnet outage, the A utmost point produces up-down vibration because of the elastic force of self, and very fast reinstatement.0.5 watt of electromagnet (7) power under the continuous rainfall condition, uses 12 volt of 1 ampere-hour battery, can support more than 2000 hours that rainfall sampler can use two kinds of power supplys of AC and DC, thereby also can work reliably in area unstable at civil power even that do not have an electricity.Well heater (8) adopts 8W, and 10 Ω enamel resistance add rain cover (11), and well heater uses (surveying snowfall uses) in the winter time.Protection network (2) adopts 2 * 2(mm) stainless (steel) wires, prevents the dust storm intrusion, and the glass cloth laminated sheet material is all adopted in base plate (6), shell (4), the two poles of the earth insulating support (5), (12), dress operation circuit (Fig. 3) in the rain cover (9).Control circuit part (Fig. 3) is divided into counting, logical process and power drives three parts, segment count is with two kinds of signals: after precipitation signal and sub-signal add up respectively in two counters, compare in comparer separately with Sensitirity va1ue that presets and delay duration, when the precipitation signal (unit interval) of accumulative total reaches a certain sensitivity of presetting, show output terminal Q=1, relay J 2 adhesives, motor just changes, and opens top cover and begins sampling; After rain stopped, sub-signal began accumulative total, when the sub-signal that adds up reaches the delay duration of presetting; one " O " holds trigger output terminal Q=1, relay J 1 adhesive for the trigger R of control section by its comparer output; top cover is closed in the motor counter-rotating, protects sample thief.Initialize switch when segment count is provided with the sensitivity initialize switch and postpones, in order to import selected Sensitirity va1ue and to postpone duration, sensitivity has 10 class, can preset according to the different location Various Seasonal, has prevented the interference that non-precipitation is connected effectively; 10 class are also arranged during delay, suitably selected after, can after precipitation stops, in time closing top cover protection sample so that accurately measure, can solve in the precipitation short time simultaneously again to have a rest and produce false " rain stops ", these two kinds of initialize switches have guaranteed the reliability of sampling.

Relay, top cover and drive motor should be selected the respective model product for use according to the physical construction power demand of automatic rainfall monitor.

Claims

1, a kind of ZD type precipitation sensor has probe and operation circuit.The probe that it is characterized in that this sensor is made of two comb electrodes, broach alternately at grade, an end (outer end) at A, B the two poles of the earth is fixed on the support, the other end can up-down vibration, an electromagnet is arranged at A below extremely.When precipitation, raindrop cross-over connection A, B the two poles of the earth of dropping on the probe make the loop conducting, produce a pulse signal.Electromagnet attracts A extremely downwards simultaneously, and cross-over connection is broken in the water droplet of A, the B utmost point, makes the loop outage, and the A utmost point is shaked off the residual globule and very fast reinstatement by the upper and lower vibration of elasticity of self, and A, the B utmost point are in not on-state again.Selector switch when operation circuit is provided with sensitivity and delay judges that according to their prevalue rainy or rain stops.

2, according to the described ZD type of claim 1 precipitation sensor, the comb electrodes that it is characterized in that this sensor is vibratile.

3, according to the described ZD type of claim 2 precipitation sensor, the useful area that it is characterized in that the alternate district of broach of this sensors A, the B utmost point is 40-80cm ², the gap of A, B the two poles of the earth broach is 0.5-0.75mm, and the A utmost point facewidth is 0.75-1.0mm, and the B utmost point facewidth is 0.5-0.75mm.