Liquid level detection device
A liquid level detection and liquid level technology, which is applied in the direction of buoy liquid level indicator, etc., can solve the problems of complicated circuit structure and difficult miniaturization, and achieve the effect of simplifying the circuit structure.
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Embodiment approach 1
[0064] figure 1 It is a figure explaining the appearance structure of the liquid level detection apparatus based on Embodiment 1.
[0065] refer to figure 1 , The liquid level detection device 1 includes: a float 20 that follows the rise and fall of the liquid level, a guide portion (guide member) 10 and a detection circuit 50 .
[0066] The detection circuit 50 detects the position of the float 20 based on output signals (also referred to as AMR outputs) detected from a plurality of magnetic sensors (AMR (Anisotropic Magneto Resistance) elements) attached to the guide member 10 .
[0067] figure 2 It is a figure explaining the some magnetic sensor 5 attached to the guide part 10 based on Embodiment 1.
[0068] refer to figure 2 , the plurality of magnetic sensors 5 are arranged at predetermined intervals along the vertical direction.
[0069] A float magnet 2 (hereinafter also simply referred to as a magnet 2 ) is provided on the float 20 . Specifically, magnets 2A,...
Embodiment approach 2
[0226] In the above-mentioned embodiment, the N pole and the S pole of one magnet of the float 20 have been described in the horizontal direction, and the configuration in which the two magnets face each other is described. Set to another configuration.
[0227]For example, the north pole and the south pole of the magnetic poles of the magnet provided in the float 20 may be arrange|positioned in a lifting direction.
[0228] Figure 20 It is a figure explaining the layout of the magnet attached to the float 20 based on Embodiment 2, and magnetic sensor 5PA, 5PB, 5PC.
[0229] Such as Figure 20 As shown, a magnet unit different from the magnets 2A, 2B is provided. In this example, magnets 2C, 2D are provided as different magnet units. In the magnets 2C and 2D, N poles and S poles of the respective magnets are arranged in the same direction in the lifting direction, and are arranged in a positional relationship facing each other. Even with this configuration, position dete...
Embodiment approach 3
[0306] In the above-mentioned embodiment, the configuration in which a magnet unit including a plurality of magnets is provided on the float 20 has been described, but it is not limited to a plurality of magnets, and the same can be achieved with a single magnet.
[0307] Figure 29 It is a figure explaining the layout of the magnet 2B attached to the float 20 according to Embodiment 3, and the some magnetic sensor 5.
[0308] Such as Figure 29 shown, with Figure 7 In contrast, the magnet 2A is removed, forming a magnet unit in which only the magnet 2B exists.
[0309] Other composition and Figure 7 are the same, so a detailed description thereof will not be repeated.
[0310] In the configuration of the third embodiment, similarly to the liquid level detection device 1 according to the first embodiment, it is possible to perform highly accurate position detection of the float 20 based on two electric signals. In this way, there is no need to provide a switching circui...
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