WO2020147351A1 - 一种磁阻式密封非接触液位传感器 - Google Patents

一种磁阻式密封非接触液位传感器 Download PDF

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WO2020147351A1
WO2020147351A1 PCT/CN2019/111467 CN2019111467W WO2020147351A1 WO 2020147351 A1 WO2020147351 A1 WO 2020147351A1 CN 2019111467 W CN2019111467 W CN 2019111467W WO 2020147351 A1 WO2020147351 A1 WO 2020147351A1
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chip
magnetoresistive
liquid level
level sensor
contact liquid
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PCT/CN2019/111467
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English (en)
French (fr)
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吕平平
沈佳佳
陈良
李丽涓
陆丽
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浙江湖州新京昌电子有限公司
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Publication of WO2020147351A1 publication Critical patent/WO2020147351A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
    • G01F23/30—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats
    • G01F23/32—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements
    • G01F23/38—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by floats using rotatable arms or other pivotable transmission elements using magnetically actuated indicating means

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  • the invention belongs to the technical field of automobile oil level sensors, and specifically relates to a magnetoresistive sealed non-contact liquid level sensor.
  • valves on traditional fuel tanks are all perforated and welded on the surface of the fuel tank after the fuel tank is formed, which will destroy the barrier layer in the plastic fuel tank shell. Therefore, the fuel tank needs to use an injection valve with a barrier layer, but there is still a risk of exceeding the standard when there are too many valves.
  • the ultimate solution is to make these valve lines and oil level sensors built into the fuel tank when the fuel tank is formed without damaging the tank shell, commonly known as the two-piece plastic fuel tank technology. In this way, if the oil level sensor cannot be replaced later, if the replacement needs to be replaced together with the oil tank, the maintenance cost is very high.
  • the purpose of the present invention is to provide a magnetoresistive sealed non-contact liquid level sensor in view of the shortcomings of the existing technology.
  • This product uses magnetoresistive elements to make a sealed sensor to replace the traditional thick film resistor chip oil level sensor, solving the structure Difficulty in sealing, inferior oil products, and abnormal wear that cause sensor failure; at the same time, it will solve the problem of poor product stability caused by the influence of temperature on the oil level sensor products made of Hall elements, high requirements on the magnetic field of the magnet, and demagnetization of the magnet at high temperatures. Inductive Hall elements and excessive magnetic flux will cause damage to the chip and other technical problems.
  • a magnetoresistive sealed non-contact liquid level sensor comprising a chip assembly composed of two plate seals, characterized in that: the chip assembly has a cavity inside and the magnetoresistive chip is located in the cavity, and the chip assembly
  • the formed outer side wall is provided with an outer cover plate, the outer cover plate is rotatably connected with a rocker arm, and a magnet and a float are arranged in the rocker arm.
  • the chip assembly includes a skeleton and a chip cover, the front side of the skeleton is provided with a chip placement cavity, and the chip placement cavity is provided with a magnetoresistive chip.
  • the lead assembly is connected.
  • the chip assembly includes a skeleton and a chip cover plate, the back side of the chip cover plate is provided with a chip placement cavity, and the chip placement cavity is provided with a magnetoresistive chip.
  • the lead assembly in the cover is connected.
  • a pair of chip fixing plates are arranged in the chip placement cavity, and the magnetoresistive chip is fixed between the two chip fixing plates.
  • a movable groove is provided on the bonding surface of the outer cover plate and the frame, and the rocker arm is rotatably connected in the movable groove.
  • a convex shaft portion is formed on the front end surface of the rocker arm and located at the rotation center of the rocker arm, and the convex shaft portion is inserted into a concave hole on the back side of the chip assembly.
  • a rectangular groove is arranged in the part, and a magnet facing the magnetoresistive chip is fixed in the rectangular groove; the magnet adopts a radial magnetization process.
  • the upper end of the rocker arm has a mounting hole penetrating the front and back sides, the float lever at the end of the float rod is inserted into the mounting hole, and the rear end of the rocker arm is provided with a float rod for fixing the float rod.
  • Buckle a float is installed at the uppermost end of the floating rod.
  • a plurality of claws are formed on both sides of the chip assembly, and the claws are clamped in the grooves provided on the left and right sides of the outer cover plate.
  • a plurality of claws are formed on the left and right sides of the outer cover plate, and the claws are clamped in the grooves provided on the left and right sides of the chip assembly.
  • the magnetoresistive chip includes a chip base and chip pins fixed on the chip bottom plate, and an MR magnetoresistive sensor is fixed on the chip base, and the MR magnetoresistive sensor and the chip pins are connected by wires Connect, a plurality of capacitors are arranged on the chip pins.
  • the MR magnetoresistive sensor can only be driven in the radial direction of the magnetic field, and does not calculate the magnetic field strength. Therefore, even if the magnet is aging, mechanical damage or the temperature change error of the magnet causes the magnetic field strength to change, the MR magnetoresistive sensor It still works normally.
  • Figure 1 is a schematic diagram of the three-dimensional structure of the present invention.
  • Figure 2 is an exploded view of the present invention
  • Figure 3 is a rear view of the present invention.
  • Figure 4 is a cross-sectional view in the direction of B-B in Figure 3;
  • Figure 5 is a schematic diagram of the structure of the magnetoresistive chip of the present invention.
  • a magnetoresistive sealed non-contact liquid level sensor includes a chip assembly composed of two plates sealed, and the chip assembly has a cavity inside and the magnetoresistive chip 3 is located in the cavity Inside, an outer cover 7 is provided on the outer side wall of the chip assembly, a rocker 6 is rotatably connected to the outer cover 7 and a magnet 5 and a float 9 are provided in the rocker 6.
  • the chip assembly includes a skeleton 1 and a chip cover 4, the front side of the skeleton 1 is provided with a chip placement cavity, the chip placement cavity is provided with a magnetoresistive chip 3, and the magnetoresistive chip 3 is injection molded on the skeleton
  • the pin assembly 2 in 1 is connected.
  • the chip assembly includes a skeleton 1 and a chip cover plate 4, the back side of the chip cover plate 4 is provided with a chip placement cavity, the chip placement cavity is provided with a magnetoresistive chip 3, and the magnetoresistive chip 3
  • the pin assembly 2 in the chip cover 4 is connected.
  • a pair of chip fixing plates 12 are arranged in the chip placement cavity, and the magnetoresistive chip 3 is fixed between the two chip fixing plates 12.
  • a movable groove 71 is provided on the bonding surface of the outer cover 7 and the frame 1, and the rocker arm 6 is rotatably connected in the movable groove 71.
  • a convex shaft portion 62 is formed on the front end surface of the rocker arm 6 and located at the center of rotation of the rocker arm.
  • the convex shaft portion 62 is inserted into the concave hole 14 on the back side of the chip assembly.
  • a rectangular groove 621 is provided in the shaft portion 62, and a magnet 5 facing the magnetoresistive chip 3 is fixed in the rectangular groove 621; the magnet adopts a radial magnetization process.
  • the upper end of the rocker arm 6 has a mounting hole 601 penetrating the front and rear sides, the float lever 81 at the end of the floating rod 8 is inserted into the mounting hole 601, and the rear end of the rocker arm 6 is provided with a fixed floating rod.
  • the floating rod buckle 63 of 8; a float 9 is installed at the uppermost end of the floating rod 8.
  • a plurality of claw buckles are formed on both sides of the chip assembly, and the claw buckles are clamped in the grooves provided on the left and right sides of the outer cover 7.
  • a plurality of claws are formed on the left and right sides of the outer cover plate 7, and the claws are clamped in the grooves provided on the left and right sides of the chip assembly.
  • the magnetoresistive chip 3 includes a chip base 31 and chip pins 33 fixed on the chip bottom plate, and an MR magnetoresistive sensor 32 is fixed on the chip base 31, and the MR magnetoresistive sensor 32 is connected to the chip lead.
  • the pins 33 are connected by wires, and a plurality of capacitors 34 are provided on the chip pins 33.
  • the magnetoresistive chip 3 and the magnet 5 are separated by a skeleton 1.
  • the magnetic field lines of the magnet 5 penetrate the skeleton wall to induce the MR magnetoresistive sensor 32 in the magnetoresistive chip 3; the chip cover 4 is installed on the skeleton 1
  • the magnetoresistive chip 3 is externally protected and a welding process is used to enable the magnetoresistive chip 3 to be located in a closed cavity.
  • the MR magnetoresistive sensor 32 in the present invention is a magnetic angle sensor module. This angle measurement module is pre-programmed and pre-calibrated, so it is easy to use.
  • the magnet adopts a radial magnetization process to drive the chip to work.
  • the magnetoresistive chip can output The linearly transformed voltage signal is given to the meter.
  • the MR magnetoresistive sensor allows users to adjust the angle range, zero angle and clamping voltage by themselves. These settings are permanently stored in non-volatile memory.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Level Indicators Using A Float (AREA)

Abstract

一种磁阻式密封非接触液位传感器，包括由两块板密封组成的芯片总成，芯片总成内部具有空腔且磁阻芯片（3）位于空腔内，芯片总成的外侧壁上设有外盖板（7），外盖板（7）上转动连接有摇臂（6），摇臂（6）中设有磁铁（5）和浮子（9）。采用磁铁（5）的磁场线穿透骨架壁感应磁阻芯片（3）中的MR磁阻传感器（32），这种无触点的原理实现了所有旋转组件的相互绝缘，从而使得整个传感系统在劣质汽油或者甲醇和乙醇腐蚀较强的燃料中能长期保持强效运作；MR磁阻传感器（32）只对径向的磁场方向才能被驱动，因此，即使磁铁（5）在老化、机械损伤或磁体温度变化误差等引发磁场强变化的情况下，MR磁阻传感器（32）依然可以正常工作。

Description

一种磁阻式密封非接触液位传感器 技术领域
本发明属于汽车油位传感器技术领域，具体是涉及一种磁阻式密封非接触液位传感器。
背景技术：
生态环境部近日发布《中国机动车环境管理年报》，中国将实施最严格的机动车环境监管制度。在大气污染日益对人们的生产、生活造成严重影响的压力下，全国各地推动机动车环保升级的积极性都很高从2020年7月1国家将对汽车实施更为严格的燃油车国六排放标准，“使用国六油品除了能降低机动车排放污染外，由于油品的废物、杂质的含量降低将减少发动机积碳的形成和发动机的磨损量，可以延缓发动机的保养周期、提高发动机使用寿命。
在燃油系统中，最大的难点在于油箱。传统油箱上的阀门都是在油箱成形后在油箱表面打孔焊接的，这会破坏塑料油箱壳体中的阻隔层。因此，油箱需要采用带阻隔层的注塑阀门，但阀门太多时依然有超标风险。终极解决措施是让这些阀门管路、油位传感器在油箱成形时就内置在油箱内部而不破坏油箱壳体，俗称塑料燃油箱两片式技术。这样对于油位传感器造成后期不可更换的情况，如更换需连同油箱一起换，维修成本非常高。
发明内容：
本发明的目的就是针对现有技术之不足，而提供一种磁阻式密封非接触液位传感器，本产品使用磁阻元件制作密封式传感器来代替传统厚膜电阻片式油位传感器，解决结构密封困难，以及劣质油品、异常磨损造成传感器失效问题；同时将解决霍尔元件制作的油位传感器产品受温度影响造成产品稳定性差、对磁铁磁场要求高、磁铁在高温下会出现退磁从而不能感应霍尔元件以及过高的磁通量会对芯片造成破坏等技术问题。
为达到上述目的，本发明的技术方案如下：
一种磁阻式密封非接触液位传感器，包括由两块板密封组成的芯片总成，其特征在于：所述芯片总成内部具有空腔且磁阻芯片位于空腔内，所述芯片总成的外侧壁上设有外盖板，外盖板上转动连接有摇臂，摇臂中设有磁铁和浮子。
作为上述技术方案的优选，所述芯片总成包括骨架和芯片盖板，所述骨架的前侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片，磁阻芯片与注塑在骨架中的引针组件相连接。
作为上述技术方案的优选，所述芯片总成包括骨架和芯片盖板，所述芯片盖板的后侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片，磁阻芯片与注塑在芯片盖板中的引针组件相连接。
作为上述技术方案的优选，所述芯片放置腔中设有一对芯片固定板，磁阻芯片固定在两个芯片固定板之间。
作为上述技术方案的优选，所述外盖板与骨架的贴合面上设有活动凹槽，摇臂转动连接在活动凹槽中。
作为上述技术方案的优选，所述摇臂的前端面且位于摇臂的旋转中心成型有凸轴部，凸轴部插设在芯片总成的后侧面所具有的凹孔中，所述凸轴部中设有矩形凹槽，矩形凹槽中固定有正对于磁阻芯片的磁铁；磁铁采用径向充磁工艺。
作为上述技术方案的优选，所述摇臂的上端具有贯穿前后面的安装孔，浮杆末端的浮子杠杆插设在安装孔中，所述摇臂的后端面设有用于固定浮杆的浮杆卡扣；所述浮杆的最上端安装有浮子。
作为上述技术方案的优选，所述芯片总成的两侧成型有多个爪扣，爪扣卡置在外盖板的左右两侧面上所设有的卡槽中。
作为上述技术方案的优选，所述外盖板的左右两侧面上成型有多个爪扣，爪扣卡置在芯片总成的左右两侧面上所设有的卡槽中。
作为上述技术方案的优选，所述磁阻芯片包括固定在芯片底板上的芯片基座和芯片引脚，所述芯片基座上固定有MR磁阻传感器，MR磁阻传感器与芯片引脚通过电线连接，所述芯片引脚上设有多个电容。
本发明的有益效果在于：
1、磁阻芯片与磁铁之间隔着骨架材料，采用磁铁的磁场线穿透骨架壁感应磁阻芯片中的MR磁阻传感器，这种无触点的原理实现了所有旋转组件的相互绝缘，加上整个芯片总成的良好密封性从而使得整个传感系统在劣质汽油或者甲醇和乙醇腐蚀较强的燃料中情况下能长期保持强效运作，并且无触点的测角范围最大可达180°。
2、MR磁阻传感器只对径向的磁场方向才能被驱动，并不计算磁 场强度，因此，即使磁铁在老化、机械损伤或磁体温度变化误差等引发磁场强变化的情况下，MR磁阻传感器依然可以正常工作。
附图说明：
图1为本发明的立体结构示意图；
图2为本发明的爆炸图；
图3为本发明的后视图；
图4为图3中B-B方向的剖视图；
图5为本发明中磁阻芯片的结构示意图。
图中，1、骨架；2、引针组件；3、磁阻芯片；4、芯片盖板；5、磁铁；6、摇臂；7、外盖板；8、浮杆；9、浮子；12、芯片固定板；14、凹孔；31、芯片基座；32、MR磁阻传感器；33、芯片引脚；34、电容；62、凸轴部；63、浮杆卡扣；601、安装孔；621、矩形凹槽；71、活动凹槽；81、浮子杠杆。
具体实施方式
以下由特定的具体实施例说明本发明的实施方式，本领域技术人员可由本说明书所揭示的内容轻易地了解本发明的其他优点及功效。本实施例中提到的“上方”、“下方”与附图本身上方、下方的方向一致，仅为便于叙述明了，而非用以限定本发明可实施的范围，其相对关系的改变或调整，在无实质变更技术内容下，也当视为本发明可实施的范畴。
见图1至图5所示，一种磁阻式密封非接触液位传感器，包括由两块板密封组成的芯片总成，所述芯片总成内部具有空腔且磁阻芯片 3位于空腔内，所述芯片总成的外侧壁上设有外盖板7，外盖板7上转动连接有摇臂6，摇臂6中设有磁铁5和浮子9。
进一步的说，所述芯片总成包括骨架1和芯片盖板4，所述骨架1的前侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片3，磁阻芯片3与注塑在骨架1中的引针组件2相连接。
进一步的说，所述芯片总成包括骨架1和芯片盖板4，所述芯片盖板4的后侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片3，磁阻芯片3与注塑在芯片盖板4中的引针组件2相连接。
进一步的说，所述芯片放置腔中设有一对芯片固定板12，磁阻芯片3固定在两个芯片固定板12之间。
进一步的说，所述外盖板7与骨架1的贴合面上设有活动凹槽71，摇臂6转动连接在活动凹槽71中。
进一步的说，所述摇臂6的前端面且位于摇臂的旋转中心成型有凸轴部62，凸轴部62插设在芯片总成的后侧面所具有的凹孔14中，所述凸轴部62中设有矩形凹槽621，矩形凹槽621中固定有正对于磁阻芯片3的磁铁5；磁铁采用径向充磁工艺。
进一步的说，所述摇臂6的上端具有贯穿前后面的安装孔601，浮杆8末端的浮子杠杆81插设在安装孔601中，所述摇臂6的后端面设有用于固定浮杆8的浮杆卡扣63；所述浮杆8的最上端安装有浮子9。
进一步的说，所述芯片总成的两侧成型有多个爪扣，爪扣卡置在外盖板7的左右两侧面上所设有的卡槽中。
进一步的说，所述外盖板7的左右两侧面上成型有多个爪扣，爪扣卡置在芯片总成的左右两侧面上所设有的卡槽中。
进一步的说，所述磁阻芯片3包括固定在芯片底板上的芯片基座31和芯片引脚33，所述芯片基座31上固定有MR磁阻传感器32，MR磁阻传感器32与芯片引脚33通过电线连接，所述芯片引脚33上设有多个电容34。
本发明中的磁阻芯片3与磁铁5之间隔着骨架1，利用磁铁5的磁场线穿透骨架壁来感应磁阻芯片3中的MR磁阻传感器32；芯片盖板4安装在骨架1的外部保护磁阻芯片3并使用焊接工艺使磁阻芯片3能位于一个密闭的腔体内。
本发明中的MR磁阻传感器32是一个磁角传感器模块，这个角度测量模块是预编程和预校准的，因此使用方便，磁铁采用径向充磁工艺，驱动芯片工作，该磁阻芯片可以输出线性变换的电压信号给仪表，MR磁阻传感器允许用户自行调整角度范围、零角度和夹紧电压，这些设置被永久地存储在非易失性内存中。
所述实施例用以例示性说明本发明，而非用于限制本发明。任何本领域技术人员均可在不违背本发明的精神及范畴下，对所述实施例进行修改，因此本发明的权利保护范围，应如本发明的权利要求所列。

Claims (10)

  1. 一种磁阻式密封非接触液位传感器，包括由两块板密封组成的芯片总成，其特征在于：所述芯片总成内部具有空腔且磁阻芯片(3)位于空腔内，所述芯片总成的外侧壁上设有外盖板(7)，外盖板(7)上转动连接有摇臂(6)，摇臂(6)中设有磁铁(5)和浮子(9)。
  2. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述芯片总成包括骨架(1)和芯片盖板(4)，所述骨架(1)的前侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片(3)，磁阻芯片(3)与注塑在骨架(1)中的引针组件(2)相连接。
  3. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述芯片总成包括骨架(1)和芯片盖板(4)，所述芯片盖板(4)的后侧面设有芯片放置腔，芯片放置腔中设有磁阻芯片(3)，磁阻芯片(3)与注塑在芯片盖板(4)中的引针组件(2)相连接。
  4. 根据权利要求2或3所述的一种磁阻式密封非接触液位传感器，其特征在于：所述芯片放置腔中设有一对芯片固定板(12)，磁阻芯片(3)固定在两个芯片固定板(12)之间。
  5. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述外盖板(7)与骨架(1)的贴合面上设有活动凹槽(71)，摇臂(6)转动连接在活动凹槽(71)中。
  6. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述摇臂(6)的前端面且位于摇臂的旋转中心成型有 凸轴部(62)，凸轴部(62)插设在芯片总成的后侧面所具有的凹孔(14)中，所述凸轴部(62)中设有安装凹槽(621)，安装凹槽(621)中固定有正对于磁阻芯片(3)的磁铁(5)。
  7. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述摇臂(6)的上端具有贯穿前后面的安装孔(601)，浮杆(8)末端的浮子杠杆(81)插设在安装孔(601)中，所述摇臂(6)的后端面设有用于固定浮杆(8)的浮杆卡扣(63)；所述浮杆(8)的最上端安装有浮子(9)。
  8. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述芯片总成的两侧成型有多个爪扣，爪扣卡置在外盖板(7)的左右两侧面上所设有的卡槽中。
  9. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述外盖板(7)的左右两侧面上成型有多个爪扣，爪扣卡置在芯片总成的左右两侧面上所设有的卡槽中。
  10. 根据权利要求1所述的一种磁阻式密封非接触液位传感器，其特征在于：所述磁阻芯片(3)包括固定在芯片底板上的芯片基座(31)和芯片引脚(33)，所述芯片基座(31)上固定有MR磁阻传感器(32)，MR磁阻传感器(32)与芯片引脚(33)通过电线连接，所述芯片引脚(33)上设有多个电容(34)。
PCT/CN2019/111467 2019-01-16 2019-10-16 一种磁阻式密封非接触液位传感器 WO2020147351A1 (zh)

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