Method for detecting piston displacement through utilizing strain gauges
A piston displacement and strain gauge technology, applied in the field of displacement sensors, can solve problems such as poor nonlinearity of displacement data, low bridge output voltage, and poor sensitivity, and achieve high sensitivity, no increase in length, and low cost
Pending Publication Date: 2018-11-06
上海朗旦科技集团有限公司
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Problems solved by technology
If the 1 / 4 bridge connection method is used, the output voltage of the bridge is low, the sensitivity is poor, and the nonlinearity of the displacement data is relatively poor
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[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention should not be limited thereby.
[0019] Such as figure 1 As shown, the linear compressor uses the leaf spring 10 to support the piston 41 , uses the connecting piece 42 to connect the leaf spring 10 and the piston 41 , and uses the nut 43 to fix the center of the leaf spring 10 to the connecting piece 42 . Use screws 44 to fix the outer edge of the leaf spring 10 .
[0020] A method of detecting piston displacement using strain gauges, such as figure 2 , image 3 As shown, it includes a leaf spring 10 , a strain gauge 100 ( 110 ), a strain bridge box 20 and a strain data acquisition instrument 24 . The leaf spring 10 includes a scroll arm 11 , a scroll groove 12 , a central hole 13 and an outer edge hole 14 . Paste the strain gauge 100 (110) on the scroll arm 11 of the leaf spring 10, and c...
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The invention relates to a method for detecting piston displacement through utilizing strain gauges. A blade spring, the strain gauges, a strain bridge box and a strain data acquisition instrument arecomprised, wherein the strain gauges are pasted on a vortex arm of the blade spring, and a strain gauge signal wire is connected with the strain bridge box and is connected with the strain data acquisition instrument. When a piston of a linear compressor has certain displacement, the blade spring generates certain deformation, after deformation is sensed by the strain gauges, resistance changes,a deformation signal is converted into an electrical signal, the electrical signal is transmitted to the strain data acquisition instrument through a signal wire, a display signal curve is monitored through a computer, and displacement data is further recorded. The method is advantaged in that a one-side two-strain gauge and two-side two-or-four-strain gauge pasting mode is employed, the pasting position of the strain gauges can be a tail portion of the vortex arm of the blade spring, no extra space is occupied, cost is low, operation is simple, sensitivity is high, and linearity of the generated displacement data is good.
Description
technical field [0001] The invention relates to a displacement sensor, in particular to a displacement detection device of a linear compressor supported by a plate spring. Background technique [0002] Linear compressors use plate springs to support the piston assembly, and its displacement detection is very important for the clearance control of the compressor. The existing displacement signal detection methods include inductive linear differential transformer, capacitive sensor, resistive sensor and other methods. The inductive linear differential transformer is a non-contact measurement, with good linearity and stability, but requires a certain installation space, complex technology, high cost, and is not suitable for devices with limited volume. Capacitive sensors also require installation space, specially designed for them. The resistive sensor can be measured indirectly through the deformation of the spring sheet, and has a simple structure and does not require a sep...
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IPC IPC(8): G01B21/02
CPCG01B21/02
Inventor 刘政任道顺
Owner 上海朗旦科技集团有限公司