CN207407962U - A kind of fuel tank for automobile liquid level sensor - Google Patents

Abstract

The utility model is related to a kind of fuel tank for automobile liquid level sensors, the transducing part includes the shell and inner core that are made of respectively stainless steel tube, the casing insulation, be concentrically socketed in outside the inner core, the inner core includes independent multistage, it is connected with each other paragraph by paragraph by the connector of insulation, axis on multistage segment length direction after connection overlaps, and becomes straight line；Every section is connected respectively by the different measurement ends that the conducting wire of the through hole among the inner core is passed through to be connected to the measurement part；The shell is welded in the one side of the ring flange of a metal, and is connected by the ring flange with the ground terminal for the measurement part for being fixed on the other one side of the ring flange.Implement a kind of fuel tank for automobile liquid level sensor of the utility model, have the advantages that：The connection of itself and shell is not easy to disconnect, cost is relatively low.

Description

A kind of fuel tank for automobile liquid level sensor

Technical field

The utility model is related to sensor field, more specifically to a kind of liquid level sensor for oil tank of vehicle.

Background technology

For the oil mass in oil tank of vehicle, measured using the sensor being arranged in fuel tank.For not Same required precision, may be employed different sensors.For example, in common oil mass detection, float sensor may be employed Judge the oil mass in fuel tank substantially, determine whether to need to refuel；And for control cost in operation, float sensing The measurement accuracy of device is inadequate, it will usually the oil mass in fuel tank is detected using capacitive liquid level sensor.In existing skill In art, capacitance type sensor includes an induction part, when the liquid level difference of the oil plant in fuel tank, the induction part flooded Length it is different, the capacitance for causing the induction part is different, according to different capacitances, it becomes possible to be converted and correspond to not Same fluid value (liquid level i.e. in fuel tank), so as to obtain the accurate numerical value of oil mass.And in the prior art Induction part include a shell and be arranged on the shell shaft core position, with the shell not in contact with inner core, this Capacitance refers to the capacitance that above-mentioned shell and inner core are obtained respectively as two electrodes of capacitor.In the prior art, on The two poles of the earth that inner core and shell are stated as capacitance are connected in the measurement end of above-mentioned measurement part respectively by a conducting wire.Due to vehicle The environment of work, for the sensor, vibrates and jolts and be inevitable, it is daily in use, finding on It states conducting wire and is susceptible to problem, particularly the conducting wire of connected with outer casing；Meanwhile entire inner core of the prior art be it is continuous, this The structure of sample so that the collimation of holding inner core becomes relatively difficult and cost is higher.

Utility model content

The technical problems to be solved in the utility model is, easily goes out for the conducting wire of the above-mentioned connected with outer casing of the prior art The defects of now disconnecting, causing high rejection rate and higher cost for inner core is kept to collimate, it is not easily broken to provide a kind of connection with shell It opens, a kind of lower-cost fuel tank for automobile liquid level sensor.

Technical solution is used by the utility model solves its technical problem：Construct a kind of fuel tank for automobile level sensing Device impregnates and including stretching into inside oil tank of vehicle, by the oil plant in the oil tank of vehicle according to oil plant liquid in the oil tank of vehicle The height of position shows the transducing part of different capacitances and transducing part output signal is converted to the oil tank of vehicle Level value measurement part, the transducing part includes the shell and inner core that are made of respectively stainless steel tube, and the shell is exhausted Edge, be concentrically socketed in outside the inner core, the inner core include independent multistage, it is mutual paragraph by paragraph by the connector of insulation It connects, the axis on the multistage segment length direction after connection overlaps, and becomes straight line；Every section respectively by passing through the inner core The conducting wire of intermediate through hole is connected to the different measurement ends connection of the measurement part；The shell is welded on the flange of a metal In the one side of disk, and connected by the ground terminal of the ring flange and the measurement part for being fixed on the other one side of the ring flange It connects.

Further, the measurement portion point include being fixed by screws in the sealed compartment of the other one side of the ring flange and Circuit board in the sealed compartment, completing transducing signal conversion function is arranged on, the circuit board is by being arranged on its ground wire It fixing screws made of copper on region and sets and penetrates what is contacted in the sealed compartment bottom with the another side of the ring flange Copper fixed column is fixed in the sealed compartment and its ground is electrically connected with the shell.

Further, described fixed column one end have setting length, through sealed compartment bottom surface and with the ring flange The external screw thread of another side contact；The other end of the fixed column is provided with screw hole, and inner surface is provided with to make the copper The internal thread that fixing screws processed enter.

Further, multiple ground connections are provided on the circuit board, be separately positioned on the circuit board not With on position, respectively by the fixing screws made of copper and fixed column corresponding with the setting position, make the circuit board Ground wire and the cage connection.

Further, the connector, which includes the first pontes, second connecting portion is divided and is arranged on described first connects Isolated part between socket part point and second connecting portion point, the first pontes, second connecting portion are divided and isolated part is equal To have the cylinder of setting length；It is different that the first pontes, second connecting portion point are socketed in the inner core respectively In the hollow through hole of Duan Xianglin one end, two sections are made to link together；It is provided with along the axis of the length direction of the connector Through the cable-through hole of the connector length direction.

Further, the outer diameter of the isolated part is outer more than what the first pontes and second connecting portion divided Footpath；The outer diameter of the isolated part is equal to the outer diameter of the section of the inner core, what the first pontes and second connecting portion were divided Outer diameter is identical, equal to the internal diameter of the pipeline of the section of the inner core.

Further, the induction part further include be arranged on it is outside the inner core, for making the outer of the inner core The inner surface of surface and the shell keeps setpoint distance and the insulation pillar in concentric position, and the insulation pillar is insulation Hollow cylindrical tube made of material.

Further, the induction part further includes the inner core being fixed on the insulation pillar and protect The insulating fixing piece held, the insulating fixing piece include being placed into one section adjacent with the ring flange in the inner core of top It top fasteners in end and is arranged on the top fasteners upper end, makes what is be formed by connecting by multiple sections by the connector The inner core is fixed on the locking cap on the insulation pillar.

Implement a kind of fuel tank for automobile liquid level sensor of the utility model, have the advantages that：Due to directly in electricity The ground area contacted with fixing the screw of the circuit board is above set on the plate of road, and the above-mentioned screw for fixing the circuit board is further through solid Fixed column engagement flange disk, and then realize the shell of induction part and the connection of measurement part, without passing through conducting wire by above-mentioned shell Measurement part is connected to, therefore is not in the problem of connection is bad；In addition, the multi-segment structure of inner core causes the standard for keeping inner core Straight degree is easier, as long as size specification and connector precision are higher, need not keep the collimation of a longer inner core Degree.Therefore, be not easy to disconnect with the connection of shell, cost it is relatively low.

Description of the drawings

Fig. 1 is a kind of structure diagram of the fuel tank for automobile liquid level sensor embodiment liquid level sensor of the utility model；

Fig. 2 be it is a kind of in the embodiment in the case of inner core structure diagram；

Fig. 3 is the structure diagram of fixed column in the embodiment.

Specific embodiment

The utility model embodiment is described further below in conjunction with attached drawing.

As shown in Figure 1 and Figure 2, in a kind of liquid level sensor embodiment for oil tank of vehicle of the utility model, the biography Sensor includes the transducing part (1,2 in Fig. 1 and Fig. 2) to link together and measurement part 4, the two parts pass through ring flange 3 link together, and form the sensor of an entirety.Wherein, transducing part is stretched into inside oil tank of vehicle, all or part (depending on the oil plant liquid level position in the fuel tank) is impregnated by the oil plant in the oil tank of vehicle and according to oily in the oil tank of vehicle The height of feed liquid position shows different capacitances；In other words, for sensor, above-mentioned transducing part be considered as one or Multiple capacitances, the Different electrodes of these capacitances are connected to above-mentioned measurement part by guiding or other connection modes respectively, when this During liquid level difference in fuel tank, the capacitance of the capacitance is also different；And it measures part and is obtaining the signal of above-mentioned transducing part On the basis of, transducing part output signal is converted into the level value of the oil tank of vehicle, so as to fulfill liquid level position really It is fixed.In the present embodiment, the shell 2 and inner core 1, the shell 2 that the transducing part includes being made of stainless steel tube respectively insulate Ground, the outside for being concentrically socketed in the inner core 1, the inner core 1 include independent multistage (in the present embodiment, with two sections of structures Into inner core 1 illustrate；The composition of inner core more than two sections can be analogized), the connection being made of insulating materials between every section Part 13 is insulated to link together, and the axis on the length direction of the section of multiple inner cores 1 after connection overlaps, and becomes one directly Line, to keep the collimation of inner core 1；The section of each inner core 1 is respectively by passing through the conducting wire 16 of the through hole among the inner core 1 to connect It is connected in the not homonymy measurement end of the measurement part；And shell 2 is then connected to above-mentioned measurement portion by different connection modes Point, in the present embodiment, the shell 2 is connected to the ground of the measurement part, since shell 2 is welded on one by metal structure Into ring flange 3 one side on, and what the ring flange 3 was made of metal, therefore, as long as the ground wire and flange of above-mentioned measurement part Disk 3 connects, and just realizes the ground terminal of the measurement part and the connection of shell 2.Specifically, in the present embodiment, the circuit Plate 42 is provided with ground region (one or more exposed, can be with the screw contact being disposed thereon and join domain), when The fixing screws made of copper 46 in its ground region are arranged on through the ground region of foregoing circuit plate 42 and circuit board 42, are gone forward side by side It, should after entering the copper fixed column 45 for being arranged on and penetrating and contacted in 41 bottom of sealed compartment with the another side of the ring flange 3 Circuit board 42 is fixed in the sealed compartment 42 and causes circuit board due to the fixing screws 46 contact with ground wire obtains Ground on 42 is electrically connected with the shell 2.In addition, it is additionally provided on above-mentioned sealed compartment 41 for for induction part output letter Number waterproof connector 47 and sealing cover 43.

In the present embodiment, the fixed column 45 with certain altitude, the fixed column are additionally provided in the bottom of sealed compartment 41 45 structure refers to Fig. 3, which includes head 451 and bottom 452, and bottom outer surface is provided with external screw thread 454, Its apical head is provided with blind hole, which is provided with internal thread 453. for above-mentioned fixed column 45, passes through In the recess for the other one side that the external screw thread 454 for being arranged on its bottom is fixed on above-mentioned ring flange 3；The head of fixed column 45 can be with Prism or cylinder are provided with, the internal thread 453 of intermediate position is used to enter for the fixing screws 46 of above-mentioned fixing circuit board, will Circuit board 42 is fixed in fixed column 45.Similarly, above-mentioned fixing screws 46 and fixed column 45 are that copper forms, and be ensure that good Good electric conductivity.

It is noted that in the present embodiment, multiple ground connection (are also provided on the circuit board 42 Line region), each ground region is separately positioned on the circuit board 42 on different position, respectively by respective made of copper solid Determine screw 56 and corresponding with the setting position, respective fixed column 45, make the ground wire of the circuit board 42 and the shell 2 Connection has independent how thick connection, ensures the reliability of connection.

In the present embodiment, although generally form the component of the sensor in the prior art without too many difference, It is that the composition of these components is different, and the structure of especially inner core 1 changes, and adds insulating bar by traditional copper foil, becomes For stainless steel tube (being provided with through hole along its length among it)；By an original continuous inner core, become multistage (this reality Apply in example exemplified by two sections, this two sections are inner core epimere 11 and inner core hypomere 12 respectively) by connector 13 (more than two sections In the case of, the quantity of the connector 13 is more than the inner core 1 1) being assembled.During assembling, connector 13 respectively by with it is above-mentioned not Linear, insulation the connection between two sections of above-mentioned inner core is realized in the cooperation of pipeline in rust steel pipe.In this way, in this implementation In example, except can prevent that measurement accuracy declines caused by long-time is aoxidized using the copper foil that brings, can also eliminate by In the longer accumulation of error brought of length, the accumulation of error including mechanical (collimation) and electrical property (capacitance).

In the present embodiment, above-mentioned connector 13 includes the first pontes, second connecting portion point and is arranged on described the Isolated part between one coupling part and second connecting portion point, above-mentioned the first pontes, isolated part and second connecting portion / be sequentially connected, an entirety is formed, in the present embodiment, above-mentioned connector 13 is made of rubber or silica gel, in order to protect Its precision is demonstrate,proved, it can be by precision die one-pass molding.The first pontes, second connecting portion are divided and isolated part is tool There is the cylinder of setting length, in-between axial location is provided with a through hole and runs through its both ends along its length, the through hole one Aspect is used to keep the flexibility of first connector 13, can preferably install, position, on the other hand, can also be for leading Line is by wherein passing through；In assembling, the first pontes, second connecting portion point are socketed in 11 and of inner core epimere respectively In the through hole of 12 one end of inner core hypomere, the inner core epimere 11 and inner core hypomere 12 is made to link together；Along the connector 13 The axis of length direction be provided through the cable-through hole of 13 length direction of connector.The outer diameter of the isolated part is more than The outer diameter of the first pontes and second connecting portion point.The outer diameter of the isolated part is equal to the inner core epimere 11 or interior The outer diameter of core hypomere 12, the first pontes 131 and second connecting portion divide 132 outer diameter identical, equal on the inner core The internal diameter of the pipeline of section 11 or inner core hypomere 12.

In the present embodiment, the inner core epimere 11 is the unclosed tube (stainless steel tube) in hollow, both ends, institute State lower 12 sections of inner core for hollow, one end (top or one end) away from the first connector 13 in Fig. 1 closing other end (top or With one end that the first connector 13 is connected in Fig. 1) unclosed tubulose, the length of the inner core epimere 11 and inner core hypomere 12 and Size is identical, outer diameter and diameter of bore including length, stainless steel tube.And in inner core 1 by being more than two sections of situations about forming Under, only it is sealing in one end of 1 one section of the lowermost of inner core, remaining section is the pipe of two sections of all blow-by, convenient for leading The extraction of line.

In addition, for concentric capacitor, the concentric degree between two electrode (above-mentioned shell 2 and inner core 1) And the distance of filled media is all very important parameter therebetween, simultaneously because using in vehicle, this is more special Applicable situation, it is necessary to consider due to the dislodged parts problem that may bring of jolting, in the present embodiment, the sensing Part further include be arranged on it is the inner core 1 outside, for make the inner surface of the outer surface of the inner core 1 and the shell 2 guarantor Hold setpoint distance and the insulation pillar 17 in concentric position, the insulation pillar 13 cylinder hollow made of insulating materials Shape pipe.In assembling, first the inner core 1 after above-mentioned connection is put into above-mentioned insulation pillar 17, then again by above-mentioned insulation pillar 17 are put into shell 2.In order to which position of the above-mentioned inner core 1 in above-mentioned insulation pillar 17 is fixed, in the present embodiment, the sense It should partly further include for the inner core to be fixed on the insulation pillar and the insulating fixing piece (14,15) kept, it is described Insulating fixing piece includes being placed into the pipeline or through hole in the one end of the inner core epimere away from the inner core hypomere Top fasteners 14 and be arranged on 14 upper end of top fasteners, make the inner core 1 be fixed on it is described insulation pillar 17 on Locking cap 15.In assembling, first the insertion of above-mentioned top fasteners 14 is had been placed on the inner core in above-mentioned insulating sheath 17 In the top duct of section 11.Then above-mentioned locking cap 15 is being used to be fixed on above-mentioned insulating sheath 17 so that in entire Core 1 and insulating sheath 17 are integrally formed.Similarly, in the present embodiment, above-mentioned inner core epimere 11 and inner core hypomere 12 with it is above-mentioned What the connecting line of measurement part and the cable-through hole set from above-mentioned insulating fixing piece length direction were drawn upwards.

Embodiment described above only expresses the several embodiments of the utility model, and description is more specific and detailed, But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this field For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims (8)

1. a kind of fuel tank for automobile liquid level sensor is impregnated including stretching into inside oil tank of vehicle, by the oil plant in the oil tank of vehicle And the transducing part of different capacitances is shown and by the transducing part according to the height of oil plant liquid level in the oil tank of vehicle Output signal is converted to the measurement part of the level value of the oil tank of vehicle, which is characterized in that the transducing part includes difference The shell and inner core being made of stainless steel tube, the casing insulation, be concentrically socketed in outside the inner core, the inner core bag Independent multistage is included, is connected with each other paragraph by paragraph by the connector of insulation, the axis on the multiple lengths direction after connection overlaps, into For straight line；Every section is surveyed respectively by the way that the conducting wire of the through hole among the inner core is passed through to be connected to the different of measurement part Measure end connection；The shell is welded in the one side of the ring flange of a metal, and by the ring flange and is fixed on the method The ground terminal connection of the measurement part of the blue other one side of disk.

2. fuel tank for automobile liquid level sensor according to claim 1, which is characterized in that the measurement portion point includes passing through spiral shell Nail is fixed on the sealed compartment of the other one side of the ring flange and is arranged in the sealed compartment, completion transducing signal conversion function Circuit board, the circuit board is by the fixing screws made of copper that are arranged in its ground region and sets and penetrates described close The copper fixed column that batten down bottom is contacted with the another side of the ring flange is fixed in the sealed compartment and causes its ground and institute State shell electrical connection.

3. fuel tank for automobile liquid level sensor according to claim 2, which is characterized in that described fixed column one end has setting Length, the external screw thread that is contacted through sealed compartment bottom surface and with the ring flange another side；The other end of the fixed column is set There is screw hole, inner surface is provided with the internal thread for entering the copper fixing screws.

4. fuel tank for automobile liquid level sensor according to claim 3, which is characterized in that be provided on the circuit board multiple Ground connection is separately positioned on the circuit board on different position, is set respectively by fixing screws made of copper and with described Corresponding fixed column is put in positioning, makes the ground wire of the circuit board and the cage connection.

5. fuel tank for automobile liquid level sensor according to claim 4, which is characterized in that the connector includes the first connection Partly, second connecting portion point and the isolated part being arranged between the first pontes and second connecting portion point, described the One coupling part, second connecting portion point and isolated part are the cylinder with setting length；The first pontes, Two coupling parts are socketed in respectively in the hollow through hole of the adjacent one end of the different section of the inner core, make two sections to link together； The cable-through hole of the connector length direction is provided through along the axis of the length direction of the connector.

6. fuel tank for automobile liquid level sensor according to claim 5, which is characterized in that the outer diameter of the isolated part is more than The outer diameter of the first pontes and second connecting portion point；The outer diameter of the isolated part is equal to the outer of the section of the inner core The outer diameter that footpath, the first pontes and second connecting portion are divided is identical, equal to the internal diameter of the pipeline of the section of the inner core.

7. fuel tank for automobile liquid level sensor according to claim 6, which is characterized in that the transducing part further includes setting It is outside the inner core, for the inner surface of the outer surface of the inner core and the shell to be made to keep setpoint distance and in same The insulation pillar of heart position, insulation pillar cylindrical tube hollow made of insulating materials.

8. fuel tank for automobile liquid level sensor according to claim 7, which is characterized in that the transducing part, which further includes, to be used for The inner core is fixed on to the insulating fixing piece on the insulation pillar and kept, the insulating fixing piece includes placing It top fasteners into the inner core in one section adjacent with the ring flange of top and is arranged in the top fasteners The locking cap held, the inner core being formed by connecting by multiple sections by the connector is made to be fixed on the insulation pillar.