SU769372A1

SU769372A1 - Pressure measuring device

Info

Publication number: SU769372A1
Application number: SU782699024A
Authority: SU
Inventors: Анатолий Иванович Муравьев
Original assignee: Предприятие П/Я А-3513
Priority date: 1978-12-20
Filing date: 1978-12-20
Publication date: 1980-10-07

Description

(54) УСТРОЙСТВО ДЛЯ ИЗМЕРЕНИЯ ДАВЛЕНИЯ(54) DEVICE FOR MEASURING PRESSURE

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Изобретение относитс к области измерительной техники, в -частности дл измерени давлени .The invention relates to the field of measurement technology, in particular for measuring pressure.

Известны устройства дл измерени давлени , в которых плоска манометрическа трубка огибает в виде буквы 5 два ролика, расположенные между параллель-, ными направл ющими. Ролики перемещаютс при подаче давлени в трубку и изгибают упругий элемент, несущий тензорезистор 1. Однако это устройство обладает низкой точностью.Pressure measuring devices are known in which a flat manometric tube encircles two rollers in the shape of a letter 5 between rollers parallel to each other. The rollers move when pressure is applied to the tube and bend the elastic element carrying the strain gauge 1. However, this device has low accuracy.

Известно устройство дл иамерени давлени , в котором тензореаисторы установлены непосредственно на трубке {2. В данном устройстве чувствительность повышена за счет изготовлени трубки с малой толщиной. Однако повышение чувствительности недостаточно, так как при подаче давлени трубка коробитс и ролики имеют недостаточное перемещение.A device for measuring pressure is known, in which strain gages are mounted directly on the pipe {2. In this device, the sensitivity is increased by making the tube with a small thickness. However, an increase in sensitivity is not enough, since when the pressure is applied, the tube warps and the rollers have insufficient movement.

Цель изобретени - повышение чувствительности измерительного устройства. Указанна цель достигаетс тем, что в устройстве дл измерени давлени , содержащем чувствительный элемент в виде плоской манометрической трубчатой пружины , переход щей в упругую ленту, 5-образно изогнутой вокруг двух роликов, расположенных между двум параллельными направл ющими, толщина стенок плоской манометрической трубчатой пружины выполнена с увеличением от места перехода пружины в ленту к направл ющим.The purpose of the invention is to increase the sensitivity of the measuring device. This goal is achieved by the fact that in a device for measuring pressure, containing a sensing element in the form of a flat manometric tubular spring, converting into an elastic band, 5-shaped bent around two rollers located between two parallel guides, the wall thickness of the flat manometric tubular spring is made with an increase from the place of transition of the spring to the belt to the guides.

На чертеже .изображено предлагаемое устройство.In the drawing. Depicts the proposed device.

Устройство содержит размещенные в The device contains hosted in

10 корпусе / ролики 2 ,и 3, расположенные между параллельными направл ющими 4, упругую ленту 5, изогнутую в виде буквы 5, один конец которой закреплен с помощью болта 6, а другой - с помощью микрометрического вита 7. Непосредственно на деформируемом участке упругой ленты 5 (с двух сторон) установлены четыре тензорезистора 8, соединенные по схеме полного электрического моста. Тензорезисторы , обозначенные звездочкой, работают на 10 body / rollers 2, and 3, located between parallel guides 4, elastic tape 5, curved in the shape of a letter 5, one end of which is fixed with a bolt 6, and the other end with a micrometric screw 7. Directly on the deformable section of elastic tape 5 (on both sides) four strain gauges 8 are installed, connected according to the scheme of a complete electric bridge. Strain gauges marked with an asterisk work on

20 сжатие, а обозначенные .крестиками - на раст жение. Участок ленты 5, охватывающей ролик 2, выполнен.в виде плоской манометрической трубчатой пружины 9, име25 ющей переменную толщину стенок, уменьшающейс от пр молинейного участка до места перехода в ленту. Возле рол1ика 2 расположены ограничители 10. Устройство снабжено электрическим разъемом // и 20 compression, and marked with crosses for stretching. The portion of the belt 5 enclosing the roller 2 is embodied in the form of a flat manometric tubular spring 9 having a variable wall thickness decreasing from the straight section to the point of transition to the belt. Limiters 10 are located near Roller 2. The device is equipped with an electrical connector // and

Claims

30 nozzle 12 for pressure addition. The tension of the belt 5 is carried out with the help of a screw .7. The device works as follows. When overpressure is applied to fitting 12, the manometric spring 9 is raised. Moreover, the sensitivity of IK to pressure, and thus to movement in the zone of the smallest wall thickness of the flat tube, increases, namely, where the cavity ends and the tube passes into a flat tape 5. At the same time, the rollers 2 3 roll over the tape 5 and at the same time move to at this part of the elastic band 5, it bends and. installed on it two strain gauges 8 (indicated by stars) which take on mechanical deformation of the compression of the elastic band 5, while their resistances decrease. The other side of the tape 5 is deformed by stretching and two resistance strain gages 8 (crosshairs) mounted on it (the crosses) perceive the mechanical deformation of the stretching of the elastic tape 5. At the same time their resistances increase. At vacuum pressure, the manometric spring 9 is compressed and the rollers 2 and 3 are moved to equal distances to the left. Sections of the elastic tape 5 receive the mechanical deformation of the opposite sign. The strain gages 8 serve as shoulders of a full bridge measuring circuit, to the output of which a recording device is connected. The magnitude of the imbalance of the bridge circuit is judged on the pressure or rarefaction of the controlled medium. Apparatus of the invention. A pressure measurement device comprising a sensing element in the form of a flat manometric tubular spring converting an elastic tape 5 bent around two rollers located between two parallel guides and transmitting a converting element characterized in that in order to increase sensitivity, in it the wall thickness of a flat gauge tubular spring is made to increase from. the places of transition of the spring in the tape to the guides. Sources of information taken into account in the examination: 1. USSR author's certificate number 296140, cl. G, 01 L 7/04, 1969.

2. USSR author's certificate number 587347, cl. G 01 L 7/04, 1976 (prototype).

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