1、SWT 壓電流量計(jì) 壓電流量計(jì) flow meter流量計(jì)是按傳感器探頭插入管道并剛好接觸流體來進(jìn)行設(shè)計(jì)的。傳感器探頭頂部承受流體切應(yīng)力的大小正比于流體的流量。The design of flow meter is according to the sensor probe inserted into the pipe and just touching the fluid. Fluid shear stress on the top

2、of sensor probe is in direct proportion to the volume of fluid flow.如圖 3.28 所示，圖 3.29 是圖 3.28 中檢測(cè)探頭的放大圖。在這兩圖中 1 為管節(jié)部分，2 為金屬制的管節(jié)外殼，3 為管子襯套，4 為位置調(diào)節(jié)螺桿，5 為 T 型管節(jié)(即孔腔)，6 為法蘭盤，7 為孔腔襯套，8 為探頭，9 為探頭頂部，10 為探頭體，11 為底板，12 為襯墊，13 為接地

3、引線，14 為信號(hào)引線，15 為壓電陶瓷傳感器，16 為同軸電纜的中心線，17 為同軸電纜的接地屏蔽線，18 為絕緣子，19 為信號(hào)放大器，20及 21 為法蘭盤，22 為遙控指示電路，23 為電源電路。As shown in Fig.3.28, Fig.3.29 is detector probe’s magnification of Fig.3.28. In these two figures,1-the part of pipe

4、section, 2-the metal shell of pipe section, 3-the pipe bushing, 4-the adjusting screw of position, 5-the T type pipe section ( i.e. Hole cavity),6-the flange plate;7-the bushing of hole cavity;8-the probe,9-the top of pr

5、obe, 10-the probe body,11-the baseboard,12-the pads, 13-the GND wire, 14-the signal wire, 15-the piezoelectric ceramic sensor,16-the center line of coaxial cable, 17-The GND shielding wire of coaxial cable, 18-the insula

6、tor, 19-the signal amplifier, 20 and 21-the flange plate, 22-the remote indication circuit, 23- the power supply circuit.圖:3.28 流量計(jì)縱剖面圖和插入檢測(cè)裝置的電路方框圖.圖:3.29 放大的檢測(cè)探頭把 T 型管節(jié)用螺栓擰緊在被測(cè)流體管道的管接頭法蘭盤上,在 T 型管節(jié)中插入流量計(jì)探頭就可測(cè)量流體速度。Screw

7、 the T type pipe section down on the flange plate with detected fluid pipe connection and measure the fluid speed with a flow meter probe inserted in T type tube.壓電計(jì)數(shù)器由一雙膜片型壓電元件和圖 3.49 所示的檢測(cè)電路構(gòu)成。 當(dāng)物品 G 落到壓電陶瓷元件 5上時(shí)，由于壓

8、電陶瓷元件的壓電效應(yīng)產(chǎn)生電信號(hào)，此電信號(hào)經(jīng)可控硅整流器的柵極使可控硅導(dǎo)通，經(jīng)電阻R1 加到晶體管 4 的基極上，導(dǎo)通集電極和發(fā)射極，啟動(dòng)磁繼電器，使計(jì)數(shù)器工作。Piezoelectric counter consists of a double diaphragm type piezoelectric element and the detection circuit shown in Fig.3.49. When the item G

9、 falls down to the piezoelectric ceramic element 5, the electrical signal produced by piezoelectric effect of piezoelectric element will conduct SCR via grid electrode of SCR rectifier, which will conduct collector and e

10、mitter to start magnetic relay and make the counter work with R1 added to the base electrode of transistor.圖:3.29 壓電計(jì)數(shù)器線路圖當(dāng)壓電陶瓷元件接受下一個(gè)物品再進(jìn)行動(dòng)作時(shí)，因?yàn)殡娫措娏髦苯訛樽畛醯哪鏄O性成分所截止，因而壓電陶瓷元件接受物品的反應(yīng)次數(shù)能正確地由磁繼電器的開閉而進(jìn)入計(jì)數(shù)器，并進(jìn)行運(yùn)算。這樣，這種簡單的裝置能夠正確

11、地、靈敏地對(duì)落到壓電陶瓷元件上的物品進(jìn)行計(jì)數(shù)和記錄。When the piezoelectric ceramic element receives next item and acts again, and the supply current is directly cut off by the original composition of reverse polarity, the reaction times of piezoe

12、lectric ceramic element receiving items will correctly make the counter work and calculate via magnetic relay’s opening and closing. Thus, these simple devices can correctly and swiftly count and record items falling dow