The dry-reed sensor
Technical field
The utility model belongs to the liquid level sensor technical field.Be specifically related to a kind of sensor that is used for detecting automatically the secondary cistern water level of automobile.
Background technology
At present, the high water tank sensor that uses on the automobile mainly adopts metal insert formula structure.Such metal insert formula structure sensor is because injection moulding can not guarantee fully that sensor electrode and plastics closely cooperate, thereby there is the shortcoming of damaging Engine ECU in anti freezing solution along sensor electrode and plastic injection-moulded binding site seepage.
Summary of the invention
The purpose of this utility model be exactly provide at above-mentioned weak point a kind of compact conformation, in light weight, do not have infiltration or the high dry-reed sensor of defective, long product lifecycle and functional reliability such as leak.
Technical solution of the present utility model is: a kind of dry-reed sensor is characterized in that: be made of terminal inserted sheet assembly, housing, magnet steel, float, blanking cover, wiring board assembly and O-ring seal; Wherein, terminal inserted sheet assembly is formed by standard terminal, conduction inserted sheet integral molded plastic; Housing is the cavity of lower end closed, and the upper end is connected with terminal inserted sheet assembly, and outer surface of upper is provided with the external thread that can be connected with the secondary water tank of automobile, and the bottom is the cylinder guide shape, and the lower end is connected with blanking cover; The wiring board assembly is made of copper coating board, tongue tube, Chip-R, is positioned at the housing upper chamber; Magnet steel is positioned at float, is sleeved on the lower housing portion cylinder guide; O-ring seal is positioned at the other seal groove of housing upper external thread.
Magnet steel described in the technical solution of the present utility model and float are that integral molded plastic forms.
Wiring board assembly described in the technical solution of the present utility model is provided with heat-shrinkable T bush.
Blanking cover described in the technical solution of the present utility model and housing form by ultrasonic soldering.
Housing described in the technical solution of the present utility model adopts PA66 30%GF plastic material injection molded.
The utility model is owing to adopt the dry-reed sensor that is made of terminal inserted sheet assembly, housing, magnet steel, float, blanking cover, wiring board assembly and O-ring seal, after being contained in the secondary water tank of automobile, float can float over corresponding height with the height of anti-freezing liquid level, trigger the closed or disconnection of tongue tube by magnet steel, export different resistance values, the launched machine ECU of resistance value of output regularly collects, thereby realizes the function of indicated water level and warning.Because terminal inserted sheet assembly is formed by standard terminal, conduction inserted sheet integral molded plastic, thereby can improve reliability, water proof and dust proof, it has the independent grounding circuit and does not rely on housing that the characteristics of ground connection are installed.Because housing is the cavity of lower end closed, thereby can prevent that anti freezing solution from entering.Because float and magnet steel integral molded plastic form, thereby float, magnet steel be in conjunction with firmly, and magnet steel can not loose from float, guarantees that resistance output is normal.Because the wiring board assembly is provided with heat-shrinkable T bush, thereby can play the effect of tongue tube on the protection circuit plate.The utlity model has compact conformation, in light weight, do not have infiltration or the high characteristics of defective, long product lifecycle and functional reliability such as leak.The utility model is mainly used in the sensor of the secondary cistern water level of automatic detection automobile.
Description of drawings
Fig. 1 is the general structure synoptic diagram of the utility model level sensor;
Fig. 2 is the vertical view of the general structure synoptic diagram of the utility model level sensor;
Fig. 3 is the wiring board assembly front schematic view of the utility model level sensor;
Fig. 4 is the wiring board assembly schematic rear view of the utility model level sensor.
Embodiment
As shown in Figures 1 to 4.The utility model is made of terminal inserted sheet assembly 1, housing 3, magnet steel 4, float 5, blanking cover 6, wiring board assembly 7 and O-ring seal 2.Terminal inserted sheet assembly 1 is formed by standard terminal, conduction inserted sheet integral molded plastic, and material is PA66 30%GF plastics, and have the independent grounding circuit and do not rely on housing that the characteristics of ground connection are installed, and easy accessibility, highly versatile.Terminal above the terminal inserted sheet assembly 1 has adopted the international standard of water proof and dust proof, and is good fit with An Pu company sheath AMP1-967325 terminal, operative norm DIN72585 φ 2.5.Housing 3 is the cavity of lower end closed, and upper end and terminal inserted sheet assembly 1 are coated with the sealing of DP190 glue, protection circuit plate assembly after assembling by buckle-type.Housing 3 outer surface of upper are provided with the external thread and the seal groove that can be connected with the secondary water tank of automobile, and O-ring seal 2 is positioned at the sealing groove, tighten by the screw-internal thread fit of external thread and water tank, in conjunction with firm.O-ring seal 2 adopts the oil resistant sizing materials, is used for sealing between guaranteed water level sensor installed surface and the tank port, prevents radiator leak or infiltration.Housing 3 bottoms are the cylinder guide shape, are used to install magnet steel 4 and float 5.Housing 3 lower ends are connected with blanking cover 6, form its firm welding by ultrasonic soldering.Wiring board assembly 7 is made of copper coating board 8, tongue tube 9, Chip-R 10, heat-shrinkable T bush 11, is positioned at housing 3 upper chamber, and heat-shrinkable T bush plays the effect of tongue tube on the protection circuit plate.Magnet steel 4 is that integral molded plastic forms with float 5, is sleeved on the housing 3 lower cylindrical shape guide rods, and float, magnet steel are in conjunction with firm, and magnet steel can not loose from float, guarantees that resistance output is normal, and float decay resistance height is useful for various liquid.Housing 3 adopts PA66 30%GF plastic material injection molded, is a hermetic type structure, prevents that anti freezing solution from entering.
Magnet steel 4 adopts annular magnetic steel, and annular magnetic steel is symmetrically distributed along axis direction, can prevent that float 5 from rotating the influence to tongue tube driving magnet steel that brings, and float magnet steel assembly volume is little, and usage range is wide, and the liquid container bore that can install is minimum to be φ 16.Float decay resistance height can be applicable to the detection of various liquid.
Operating voltage is that 12/24V is general, measures accurately, is subjected to the influence of external environment less, stable performance.Highly versatile can be designed to the sensor of different length according to the height of water tank, satisfies user's needs.
Level sensor is used for the detection of the secondary antifreezing fluid for water tank of automobile, this sensor adopts tongue tube level sensing technology, float 5 is as the carrier of magnet steel 4, the induction height of water level floats over corresponding height with the height of antifreeze liquid level in the water tank, is furnished with tongue tube 9 on the wiring board assembly 7, control the connecting and disconnecting in whole loop, wiring board assembly 7 is placed on housing 3 inside, and the design of housing one end has the guide rail of cylinder guide as float 5, play the guiding role.Magnet steel 4 with float 5 when guide rod fluctuates, the driving tongue tube is switched on or switched off, export corresponding resistance and pass to instrument or Engine ECU, water level just often, tongue tube closure, the resistance of circuit output R1, when water level is lower than the liquid level of setting, tongue tube disconnects, the resistance value of circuit output R1+R2, and this moment, alarm lamp was bright.