SU979924A1

SU979924A1 - Pressure pickup

Info

Publication number: SU979924A1
Application number: SU813334693A
Authority: SU
Inventors: Василий Леонидович Дворянков; Юрий Иванович Самойленко
Original assignee: Ордена Ленина Институт Кибернетики Ан Усср
Priority date: 1981-06-10
Filing date: 1981-06-10
Publication date: 1982-12-07

Description

(54) ДАТЧИК ДАВЛЕНИЯ(54) PRESSURE SENSOR

Изобретение относитс к измерению давлений, в частности, к электроразр дным датчикам и может быть использовано дл измерени давлений преимущественно с вакуумметрами у которых ток поддерживаетс неизменным при изменении давлени .The invention relates to the measurement of pressures, in particular, to electric-discharge sensors, and can be used to measure pressures predominantly with vacuum gauges in which the current is kept constant as the pressure changes.

Известны электроразр дные датчики -давлени 1.Electro-discharge sensors of pressure 1 are known.

Наиболее близким к изобретению по технической сущности и достигаемому результату вл етс электроразр дный датчик давлени , содержащий корпус, выполненный из электропроводного материала, с торцевой крышкой и выводным штырем и электродную систему диодного типа 2.Closest to the invention in technical essence and the achieved result is an electric discharge pressure sensor, comprising a housing made of an electrically conductive material, with an end cap and output pins and an electrode system of diode type 2.

К его недостаткам следует отнести недостаточно широкий рабочий диапазон .Its disadvantages include not enough wide operating range.

Целью изобретени вл етс расширение диапазона измер емых давлений путем уменьшени межэлектродного рассто ни и увеличени поверхности электродов.The aim of the invention is to expand the range of measured pressures by decreasing the electrode distance and increasing the surface of the electrodes.

Цель достигаетс тем, что в датчике давлени электродна система выполнена в виде пакета параллельных пластин, разделенных диэлектрическими прокладками, электрически соединенных между собой через одну, причем одна из крайних пластин соединена со штырем, а друга - с корпусомThe goal is achieved by the fact that in the pressure sensor the electrode system is made in the form of a package of parallel plates separated by dielectric spacers electrically interconnected through one, and one of the extreme plates is connected to the pin, and the other to the body

5 датчика.5 sensors.

Электроды могут быть выполнены из металлической сетки. Система электродов обеспечивает возникновение и поддержание разр дного тока при бодном доступе воздуха в разр дную камеру и давлени х от Ю до 750 мм рт.ст.Electrodes can be made of metal mesh. The electrode system ensures the generation and maintenance of discharge current at free air access to the discharge chamber and pressures from 10 to 750 mm Hg.

На чертеже показан датчик, общий вид в разрезе.The drawing shows the sensor, a general view in section.

«с Датчик содержит корпус 1, систему электродов 2 и 3, штырь 4, изолирующую втулку 5, изолирующие прокладки 6. Корпус выполнен из электропроводного материала. Электрод 3 соеди2Q ней с корпусом датчика, а электрод 2 соединен со штырем 4, жестко укрепленным в изолирующей втулке 5. Втулка запрессована в верхнюю крышку корпуса 1, а изолирующие прокладки 6 помещены между пластинами элек25 тродов.“The sensor comprises a housing 1, an electrode system 2 and 3, a pin 4, an insulating sleeve 5, and insulating gaskets 6. The housing is made of an electrically conductive material. Electrode 3 is connected with the sensor housing, and electrode 2 is connected to pin 4, rigidly fixed in insulating sleeve 5. The sleeve is pressed into the top cover of housing 1, and insulating spacers 6 are placed between the plates of electrodes.

Датчик работает следующим образом .The sensor works as follows.

При подаче посто нного напр жени на систему электродов 2 и 3 через When applying a constant voltage to the system of electrodes 2 and 3 through

Claims

30, the sensor flows a discharge current. the value of which is maintained vacuum-unchanged, the discharge voltage at the sensor electrodes is a measure of pressure in the discharge to the sensor measure. As the pressure in the sensor chamber changes, its internal resistance and, consequently, the voltage across the sensor electrodes, changes. The sensor current is maintained by the vacuum gauge current stabilization system unchanged in magnitude. The voltage value at the sensor is a function of the pressure in the discharge chamber of the sensor (U-fCP). This dependence is unambiguous. Each value of the sensor on the sensor at a certain current corresponds to a certain pressure. When measuring low pressures by decreasing the interelectrode distance, increasing the area of electrodes 2 and 3, and increasing the volume of the discharge chamber of the sensor, it is possible to increase the value of the discharge current at low pressure and maintain the discharge current at lower pressures compared to known devices and thereby expand the limit of measured pressure when measuring high pressures, the current does not increase. The current with a change in the pressure value is kept constant by a vacuum gauge, and the voltage drop across the sensor electrodes changes. Since there is no increase in current with increasing pressure, this measurement can be made at higher pressures. In addition, the current with a change in pressure value does not change and the voltage drop across the resistance connected in series with the sensor is invariably unlike the known ones, in which the voltage drop on the base resistance increases with increasing pressure and the sensor saturates. A decrease in the interelectrode distance and an increase in the discharge surface of the electrodes make it possible to measure at higher pressures and, thus, to expand the measurement limit. A system of electrodes, for example, FROM a metal grid with a small – electrode electrode distance and a large discharge surface of the electrodes, makes it possible to obtain a glowing discharge in the discharge chamber of the sensor over a large surface and in a large volume and thereby increase the discharge current of the sensor and maintain at low pressure, which allows the measurement limit to be expanded in the low pressure range. At high pressures of about 750 mm Hg. the conditions for ignition of the discharge are facilitated due to the small interelectrode gap, the saturation of the sensor is eliminated, which also expands the range of the measured e and pressure. Claims A pressure sensor comprising a housing made of an electrically conductive material with an end cap, with a lead pin secured by means of an insulating sleeve, and a diode-type electrode system, characterized in that, in order to expand the range of measured pressures, the electrode system is made in the form of a package of paallel plates separated by dielectric spacers, electrically interconnected through one, with one of the extreme plates connected to the pin, and the other to the sensor housing. Sources of information taken into account during the examination 1. USSR author's certificate number 459701, cl. G 01 L 21/34, 1973, 2, USSR Copyright Certificate 237428, cl. G 01 L 11/00, 1967 (prototype).