CN103471681A - Capacitance type oil level sensor filling method - Google Patents
Capacitance type oil level sensor filling method Download PDFInfo
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- CN103471681A CN103471681A CN201310450862XA CN201310450862A CN103471681A CN 103471681 A CN103471681 A CN 103471681A CN 201310450862X A CN201310450862X A CN 201310450862XA CN 201310450862 A CN201310450862 A CN 201310450862A CN 103471681 A CN103471681 A CN 103471681A
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- circuit board
- oil level
- level sensor
- capacitive oil
- high temperature
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Abstract
A capacitance type oil level sensor filling method comprises the following steps that a circuit board mounting cavity is arranged in a capacitance type oil level sensor electronic bin; a circuit board is placed in the circuit board mounting cavity; a copper bar for sensing primary capacitance data and the circuit board are connected by a first high-temperature lead by soldering; the circuit board and the capacitance type oil level sensor electronic bin are connected by a second high-temperature lead through soldering; the circuit board and two outgoing lines are also connected by soldering; silicone rubber is filled in the circuit board mounting cavity until the circuit board is just submerged, thus finishing the first filling; after the silicone rubber is fully solidified, the circuit board mounting cavity of the capacitance type oil level sensor electronic bin is filled with epoxy resin gel, namely, the space, not filled by the silicone rubber, in the circuit board mounting cavity is filled with the epoxy resin gel until the epoxy resin gel is fully solidified, thus finishing the second filling. By the capacitance type oil level sensor filling method, the possibility that a connecting part is disconnected is reduced, the buffering action and damping performance are good, the integrity is good and the waterproof property is good.
Description
Technical field
The present invention relates to a kind of capacitive oil level sensor encapsulating method.
Background technology
The capacitive oil level sensor is to utilize oil level to change and cause the principle of capacitance variation between two electrodes and the sensor that is used for measuring oil level that designs, the variation of capacitance and oil level be varied to linear relationship, by signals collecting and modulate circuit, capacitance is converted into to electric signal, the curtage signal that output and oil level are linear.The product core component adopts highly integrated special-purpose capacitance measurement chip, through accurate temperature compensation and linear revise, has the advantages such as high precision, high stability and test constantly.The capacitive oil level sensor is mainly used in the oil-level measurement of automotive oil tank, engineering machinery oil tank, oil depot, tank wagon, therefore higher anti-vibration, shock resistance and water resistance need to be arranged, and need to do anti-vibration and water-proofing treatment to electric part.
Be arranged on the capacitive oil level sensor on large-scale walking machine, be used for monitoring the oil level height of hydraulic oil or fuel oil, in actual condition, due to the impact of engine or machine-walking, the course of work of capacitive oil level sensor is accompanied by larger mechanical vibration and impact.The capacitive oil level sensor used under vibration environment, because its circuit board section connects by soldering, therefore easily disconnect, finally cause the unstable or non-output signal of output of products; Simultaneously, because walking machine is generally used out of doors, long-term exposes to the sun and rain, and to the barrier propterty of sensor, is very large test, once rainwater is invaded sensor internal, product lost efficacy.
Existing anti-vibration processing scheme is: circuit board is fixed in electronic compartment by screw, and uses rubber seal to carry out waterproof sealing; There is following defect in it: (1) screw fixation method has loosening hidden danger under long-term vibration operating mode; (2) make the mode that is screwed, under vibration environment, being connected wire and still can rocking with ambient vibration of circuit board and electrode, the soldering place still may disconnect; (3) circuit board is required to be mounting screw and reserves more space, makes effective usable floor area of circuit board little, and the circuit board making cost is high; (4) rubber parts, can be slowly aging in long-term outdoor use procedure, thereby increased the hidden danger of product water inlet.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the above-mentioned defect that prior art exists, and provides a kind of and is conducive to improve the product shock resistance, and be conducive to for the capacitive oil level sensor encapsulating method of abundant components and parts installing space is provided on circuit board.
The technical matters that the present invention further will solve is that a kind of capacitive oil level sensor encapsulating method that product waterproof property is high that is conducive to improve is provided.
The technical solution adopted for the present invention to solve the technical problems is:
Capacitive oil level sensor encapsulating method, comprise the steps:
(1) a circuit board installation cavity is set in capacitive oil level sensor electronic cabin;
(2) circuit board that will be loaded with signals collecting and modulate circuit is put into the circuit board installation cavity;
(3) carrying out soldering with the first high temperature wire between the copper rod of induction original capacitance data and circuit board is connected; Carrying out soldering with the second high temperature wire between circuit board and capacitive oil level sensor electronic cabin is connected; Also carrying out soldering between two extension lines of circuit board and capacitive oil level sensor is connected;
(4) in the circuit board installation cavity, pour into the free from corrosion silicon rubber of circuit board, until just circuit board is all flooded, make the connecting portion between connecting portion, circuit board and two extension lines between connecting portion, circuit board and second high temperature wire in connecting portion, the second high temperature wire and capacitive oil level sensor electronic cabin of connecting portion, the first high temperature wire and copper rod between circuit board and circuit board and the first high temperature wire all be solidificated in the circuit board installation cavity by silicon rubber, can reduce the possibility that causes connecting portion to disconnect because of vibration;
Complete the encapsulating for the first time of capacitive oil level sensor by above step, described silicon rubber should be selected ND219 silicon rubber.
The specific inductive capacity of the silicon rubber further, poured in the circuit board installation cavity is preferably 3.3.
When the second high temperature wire is connected with capacitive oil level sensor electronic cabin, connected mode is: first by the second high temperature wire soldering on a thin metallic nickel sheet, then with screw, thin metallic nickel sheet is fixed on the joint of electronic compartment.
The technical scheme that the technical matters that the present invention further will solve adopts is:
After the capacitive oil level sensor completes for the first time encapsulating, after the silicon rubber poured into for the first time solidifies fully, fill the there is good fire resistance characteristic epoxide-resin glue (being by the space of silicon rubber filling, not filled epoxide-resin glue in the circuit board installation cavity) of (25 ℃ of 24 hours<0.15 wt% of water-intake rate) in the circuit board installation cavity in capacitive oil level sensor electronic cabin, until epoxy resin adhesive curing, by the sealing of epoxide-resin glue, reduce the possibility that water enters contact circuit plate in the circuit board installation cavity;
Complete the encapsulating for the second time of capacitive oil level sensor by above step.
The present invention makes the connecting portion of circuit board and circuit board installation cavity by encapsulating for the first time, connecting portion between circuit board and the first high temperature wire, the connecting portion of the first high temperature wire and copper rod, the connecting portion in the second high temperature wire and capacitive oil level sensor electronic cabin, connecting portion between circuit board and the second high temperature wire, connecting portion between circuit board and two extension lines all is solidificated in silicon rubber fully, circuit board, the first high temperature wire, the second high temperature wire, the circuit board installation cavity solidifies as a whole, the possibility that connecting portion disconnects reduces, simultaneously, because silicon rubber is soft glue, there is buffer action preferably, therefore be conducive to improve the resistance to shock of product.The epoxide-resin glue that encapsulating adopts for the second time is rigid glue, because globality after solidifying is very strong, after circuit board is sealed in epoxide-resin glue fully, realized good physical isolation with the external world, water resistance is good, even the caulking gum part of electronic compartment end caps is aging, also can not damage the capacitive oil level sensor.
The accompanying drawing explanation
Fig. 1 is one embodiment of the invention structural representation.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
With reference to Fig. 1, capacitive oil level sensor encapsulating method, comprise the steps:
(1) the interior circuit board installation cavity that arranges in capacitive oil level sensor electronic cabin 8;
(2) circuit board 1 that will be loaded with signals collecting and modulate circuit is put into the circuit board installation cavity, and the size of the size of circuit board and circuit board installation cavity adapts;
(3) carrying out soldering with the first high temperature wire between the copper rod 9 of induction original capacitance data and circuit board 1 is connected, in Fig. 1: the connecting portion that label 3 indication positions are copper rod 9 and the first high temperature wire, the connecting portion that label 7 indication positions are the first high temperature wire and circuit board 1; Carrying out soldering with the second high temperature wire between circuit board 1 and capacitive oil level sensor electronic cabin 8 is connected, in Fig. 1: the connecting portion that label 6 indication positions are the second high temperature wire and circuit board 1, the connecting portion that label 11 indication positions are the second high temperature wire and capacitive oil level sensor electronic cabin 8; Also carry out soldering between two extension lines of circuit board 1 and capacitive oil level sensor and be connected, in Fig. 1: the connecting portion that label 4 indication positions are an extension line and circuit board 1, the connecting portion that label 5 indication positions are another extension line and circuit board 1;
(4) to pour into specific inductive capacity in the circuit board installation cavity be 3.3, to the free from corrosion silicon rubber 2 of circuit board, until just circuit board 1 is all flooded, make circuit board 1 and and circuit board and the first high temperature wire and the second high temperature wire between connecting portion, circuit board 1 and two extension lines in connecting portion, the second high temperature wire and capacitive oil level sensor electronic cabin 8 of connecting portion, the first high temperature wire and copper rod between connecting portion all by silicon rubber, be solidificated in the circuit board installation cavity, can reduce the possibility that causes connecting portion to disconnect because of vibration;
Complete the encapsulating for the first time of capacitive oil level sensor by above step, described silicon rubber is selected ND219 silicon rubber.
When the second high temperature wire is connected with capacitive oil level sensor electronic cabin 8, connected mode is: first second by the high temperature wire soldering on a thin metallic nickel sheet, then with screw, thin metallic nickel sheet is fixed on the joint of electronic compartment.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is: after the capacitive oil level sensor completes for the first time encapsulating, after the silicon rubber poured into for the first time solidifies fully, fill the there is good fire resistance characteristic epoxide-resin glue (being by the space of silicon rubber filling, not filled epoxide-resin glue in the circuit board installation cavity) of (25 ℃ of 24 hours<0.15wt% of water-intake rate) in the circuit board installation cavity in capacitive oil level sensor electronic cabin, until epoxy resin adhesive curing, by the sealing of epoxide-resin glue, reduce the possibility that water enters contact circuit plate in the circuit board installation cavity;
Complete the encapsulating for the second time of capacitive oil level sensor by above step.
Claims (3)
1. capacitive oil level sensor encapsulating method, is characterized in that, comprises the steps:
(1) a circuit board installation cavity is set in capacitive oil level sensor electronic cabin;
(2) circuit board that will be loaded with signals collecting and modulate circuit is put into the circuit board installation cavity;
(3) carrying out soldering with the first high temperature wire between the copper rod of induction original capacitance data and circuit board is connected; Carrying out soldering with the second high temperature wire between circuit board and capacitive oil level sensor electronic cabin is connected; Also carrying out soldering between two extension lines of circuit board and capacitive oil level sensor is connected;
(4) pour into silicon rubber in the circuit board installation cavity, until just circuit board is all flooded, make the connecting portion between connecting portion, circuit board and two extension lines between connecting portion, circuit board and second high temperature wire in connecting portion, the second high temperature wire and capacitive oil level sensor electronic cabin of connecting portion, the first high temperature wire and copper rod between circuit board and circuit board and the first high temperature wire all be solidificated in the circuit board installation cavity by silicon rubber;
Complete the encapsulating for the first time of capacitive oil level sensor by above step.
2. capacitive oil level sensor encapsulating method according to claim 1, is characterized in that, described silicon rubber is selected ND219 silicon rubber.
3. capacitive oil level sensor encapsulating method according to claim 1 and 2, it is characterized in that, after the capacitive oil level sensor completes for the first time encapsulating, after the silicon rubber poured into for the first time solidifies fully, fill epoxide-resin glue in the circuit board installation cavity in capacitive oil level sensor electronic cabin, be by the space of silicon rubber filling, not filled epoxide-resin glue in the circuit board installation cavity, until the epoxy resin adhesive curing;
Complete the encapsulating for the second time of capacitive oil level sensor by above step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450862XA CN103471681A (en) | 2013-09-29 | 2013-09-29 | Capacitance type oil level sensor filling method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310450862XA CN103471681A (en) | 2013-09-29 | 2013-09-29 | Capacitance type oil level sensor filling method |
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| CN103471681A true CN103471681A (en) | 2013-12-25 |
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| CN201310450862XA Pending CN103471681A (en) | 2013-09-29 | 2013-09-29 | Capacitance type oil level sensor filling method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132712A (en) * | 2014-07-17 | 2014-11-05 | 湖南宇航科技有限公司 | Method for pouring glue into capacitive water level sensor |
| CN105547273A (en) * | 2015-12-02 | 2016-05-04 | 北京七维航测科技股份有限公司 | Impact resisting angular speed gyro |
| CN109725282A (en) * | 2019-03-11 | 2019-05-07 | 苏州寻息电子科技有限公司 | Totally-enclosed encapsulating beacon and its dosing technology |
| CN113009192A (en) * | 2021-02-26 | 2021-06-22 | 宁波央腾汽车电子有限公司 | Integrated large-current detection device around bus capacitor |
Citations (5)
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|---|---|---|---|---|
| CN2191417Y (en) * | 1994-01-13 | 1995-03-08 | 陈义新 | Static levelmeter |
| JP2003194620A (en) * | 2001-12-25 | 2003-07-09 | Denso Corp | Detector for vehicle |
| CN2699239Y (en) * | 2004-04-29 | 2005-05-11 | 江苏光芒厨卫太阳能科技有限公司 | Condenser type water temperature and water level sensing transmitter |
| JP2010048772A (en) * | 2008-08-25 | 2010-03-04 | Ngk Spark Plug Co Ltd | Liquid state detection sensor |
| CN202974385U (en) * | 2012-12-13 | 2013-06-05 | 上海朝辉压力仪器有限公司 | Capacitance liquid level transmitter |
-
2013
- 2013-09-29 CN CN201310450862XA patent/CN103471681A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2191417Y (en) * | 1994-01-13 | 1995-03-08 | 陈义新 | Static levelmeter |
| JP2003194620A (en) * | 2001-12-25 | 2003-07-09 | Denso Corp | Detector for vehicle |
| CN2699239Y (en) * | 2004-04-29 | 2005-05-11 | 江苏光芒厨卫太阳能科技有限公司 | Condenser type water temperature and water level sensing transmitter |
| JP2010048772A (en) * | 2008-08-25 | 2010-03-04 | Ngk Spark Plug Co Ltd | Liquid state detection sensor |
| CN202974385U (en) * | 2012-12-13 | 2013-06-05 | 上海朝辉压力仪器有限公司 | Capacitance liquid level transmitter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132712A (en) * | 2014-07-17 | 2014-11-05 | 湖南宇航科技有限公司 | Method for pouring glue into capacitive water level sensor |
| CN105547273A (en) * | 2015-12-02 | 2016-05-04 | 北京七维航测科技股份有限公司 | Impact resisting angular speed gyro |
| CN105547273B (en) * | 2015-12-02 | 2019-01-22 | 北京七维航测科技股份有限公司 | A kind of shock resistance angle speed gyro |
| CN109725282A (en) * | 2019-03-11 | 2019-05-07 | 苏州寻息电子科技有限公司 | Totally-enclosed encapsulating beacon and its dosing technology |
| CN113009192A (en) * | 2021-02-26 | 2021-06-22 | 宁波央腾汽车电子有限公司 | Integrated large-current detection device around bus capacitor |
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Application publication date: 20131225 |
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