CN100445704C

CN100445704C - Double contact liquid level sensor

Info

Publication number: CN100445704C
Application number: CNB200510030559XA
Authority: CN
Inventors: 康元福; 屈晨竹; 杨文杰; 林卫东
Original assignee: United Automotive Electronic Systems Co Ltd
Current assignee: United Automotive Electronic Systems Co Ltd
Priority date: 2005-10-14
Filing date: 2005-10-14
Publication date: 2008-12-24
Anticipated expiration: 2025-10-14
Also published as: CN1786675A

Abstract

The present invention discloses a double-contact liquid level sensor which can improve signal transmission quality. The present invention is mainly composed of a main body, a rotary mechanism, a reed and an output and an input conductive wires, wherein the rotary mechanism is fixed to the main body through a bearing, and can freely rotate around the bearing. The reed is fixed to the rotary mechanism, and rotates along with the rotary mechanism. The front end of the reed is provided with two sliding contacts. The present invention also comprises a conduction belt, wherein the two sliding contacts are simultaneously pressed on the conduction belt. The input conductive wire is connected with the conduction belt, and the output conductive wire is connected with the reed. The sliding contacts are composite contacts, and the top of the front end of each sliding contact and the contacting part of the conduction belt are made of corrosion proof gold alloy.

Description

A kind of double contact liquid level sensor

Technical field

The present invention relates to a kind of liquid level sensor that is applied to the oil level of measuring vehicle fuel tank, relate in particular to a kind of double contact liquid level sensor.

Background technology

The working environment of existing liquid level sensor is more abominable, and fuel oil constantly produces corrosion to the contact and the conduction band of sensor, and contact and conduction band contact portion be the easiest excessive the or problem such as open circuit of contact resistance to occur, influences the output quality of sensor signal or opens circuit.

In addition, in order to increase the corrosion resistivity of contact, now mostly be to adopt craft of gilding or directly adopt golden contact, but price is very expensive; And in order to increase the corrosion resistivity of conduction band, the now employing the conduction band surface finish improving surface quality more, but increased the manufacture craft process.

The disclosed publication number of Japanese patent laid-open publication gazette is in the file of JP11-337387A, disclosure a kind of liquid level sensor of knowing clearly, as shown in Figure 1, it comprises body, contact board 8, contact board is fixed on the body, two contacts 11 of the front end of contact board, 12 slide on conductor belt 4, two contacts 11,12 are pressed on the conductor belt simultaneously, two contacts 11,12 adopt different materials, the better silver palladium alloy of corrosion resistance is adopted in a contact, the better silver-nickel of contact is adopted in another contact, provides a kind of economy in the hope of reaching with the different material of sliding contact, permanance, the purpose of the level sensor that contact reliability is superior.But because silver palladium alloy costs an arm and a leg, silver-nickel is also expensive, and alloy is at high price all used in integral body in two contacts, is difficult to reach simultaneously purpose durable, that contact is reliable and economic.

Summary of the invention

Technical matters to be solved by this invention provides a kind of double contact liquid level sensor, and it is durable, contact is reliable and economical, can improve signal transmission quality.

In order to solve above technical matters, the invention provides a kind of double contact liquid level sensor, it comprises a conduction band, body, rotating mechanism, reed and input, output lead, wherein, described rotating mechanism by bearing fixing on body and can rotate freely around bearing, described reed is fixed on the rotating mechanism and with rotating mechanism and rotates, front end at described reed has two sliding contacts, described sliding contact is crushed on the conduction band simultaneously, one of them of described input lead or output lead links to each other with described reed, another links to each other with described conduction band, described sliding contact adopts composite contact, front top and conduction band contact portion at sliding contact, adopt alloy material, described reed links to each other with input lead or output lead by a volute spring, and described volute spring is enclosed within on the described bearing and is fixed on the described body.

The present invention is to having adopted composite contact owing to sliding contact, use this part of very corrosion resistant billon only to take very little volume, can control comparatively cheap price, on the other hand, guarantee that also the contact part that contacts with conduction band is corrosion-resistant, contact reliably and economical, reed links to each other with input lead or output lead by volute spring in addition, has improved the signal quality of whole sensor.

Description of drawings

Below in conjunction with the drawings and specific embodiments, the present invention is further elaborated.

Fig. 1 is the disclosed liquid level sensor synoptic diagram of Japanese JP11-337387A;

Fig. 2 is a structural representation of the present invention;

Fig. 3 is the rear view of Fig. 2;

Fig. 4 is a contact contact structure synoptic diagram of the present invention.

Embodiment

Fig. 2, the 3rd, structural representation of the present invention.It mainly comprises body 29, rotating mechanism 30, reed 25, volute spring 27, conduction band 22, input lead 21 and output lead 28 compositions.Wherein, rotating mechanism 30 is fixed on the body 29 by bearing 31 and can rotates freely around bearing 31, and it drives by buoy and is rotated.Reed 25, can adopt tongue-shaped reed, be fixed on the rotating mechanism 30 and and be rotated with rotating mechanism 30, front end at reed 25 has two tongues that separate, at two tongue positions two sliding

contacts

23,24 are arranged, they are pressed on the conduction band 22 in advance, and conduction band 22 tilings also are fixed on the body 29, it links to each other with input lead 21, and output lead 28 then links to each other with volute spring 27; Volute spring 27 be enclosed within bearing 31 on and be fixed on the body 29, it links to each other by pad 26 with reed 25.

The present invention has adopted the circuit transmission mode of double-contact in parallel, its signal transduction process is as follows: signal at first is transferred on the conduction band 22 from input lead 21, be transferred to slideway contact 23 and slideway contact 24 simultaneously by conduction band 22 then, because the slideway contact coexists on the reed 25, be transferred on the volute spring 27 by reed 25 like this, pad 32 through the back side is transferred to output lead 28 then, transfers out by this output lead 28 at last.This structure has adopted redundant design to contact and the conduction band contact portion that easily goes wrong most, and one of them goes wrong, and does not influence the signal in whole loop, and the probability that goes wrong of sensor significantly reduces like this.

In addition, the present invention has also adopted special compound contact structure design to

slideway contact

23,24, as shown in Figure 4.It is 23,24 top 33 in the slideway contact, promptly with conduction band 22 contact portions, use very corrosion resistant billon, this part only takies very little volume, can control comparatively cheap price, on the other hand, it has guaranteed that also the contact part that contacts with conduction band is not corroded, and has improved the signal quality of whole sensor.

In addition, what present conduction band adopted is the GSD slurry, after need polishing, the sintering rear surface just can reach the desirable smooth finish that gets, the material of conduction band 22 of the present invention has then adopted the M slurry, the M slurry is made up of the particle that varies in size, because granule is filled into the bulky grain the inside, the surface can reach very high smooth finish behind the sintering, thereby the raising decay resistance does not need further technique for grinding again.

Claims

1, a kind of double contact liquid level sensor, it comprises a conduction band, body, rotating mechanism, reed and input, output lead, wherein, described rotating mechanism by bearing fixing on body and can rotate freely around bearing, described reed is fixed on the rotating mechanism and with rotating mechanism and rotates, front end at described reed has two sliding contacts, described two sliding contacts are crushed on the conduction band simultaneously, one of them of described input lead or output lead links to each other with described reed, another links to each other with described conduction band, it is characterized in that, described sliding contact adopts composite contact, front top and conduction band contact portion at sliding contact, adopt alloy material, described reed links to each other with input lead or output lead by a volute spring, and described volute spring is enclosed within on the described bearing and is fixed on the described body.

2, double contact liquid level sensor as claimed in claim 1 is characterized in that, the material of described conduction band adopts the M slurry.