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манометр

устройство

работа

давление

прибор

пружинные манометры

трубка Бурдона

класс точности

шкала

стрелка

датчик

гидропривод

пневмопривод

принцип работы

система

видео урок

обучающее видео

видео

урок

обучение

видео обучение

техника

инженер

наука

устройство и принцип работы

принцип действия

глицерин

бар

bar

00:00:02

a pressure gauge is a device for measuring the

00:00:04

excess pressure of a gas or liquid;

00:00:07

the most widely used

00:00:09

design of a pressure gauge is based on a

00:00:12

bourdon tube; the main elements of the design of

00:00:15

such a pressure gauge are the body in

00:00:18

which a scale arrow is installed,

00:00:20

mounted on an axis which is connected to a

00:00:23

gear lever mechanism

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mounted on a plate; the

00:00:27

measured pressure is supplied through a fitting

00:00:29

to the internal the cavity of a

00:00:31

bourdon tube which is connected by means of a rod with a

00:00:34

geared lever mechanism; let us

00:00:38

consider in more detail the principle of operation of a pressure

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gauge; a

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bourdon tube is a ring-shaped tube of

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oval cross-section; one end of the tube is

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sealed and connected to the rod; the opposite

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end of the tube is connected to a fitting through

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which the

00:00:57

measured medium, gas or liquid, is supplied to the internal cavity of the tube;

00:01:01

have one incomplete turn

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as shown in the diagram or a larger

00:01:07

number of turns in this case it

00:01:09

looks like a spiral due to the fact that the area of the

00:01:12

outer surface of the ring is greater than the

00:01:14

area of the inner surface of the pipes and

00:01:17

will tend to straighten under the

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influence of pressure

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and the amount of deformation of the tube will be

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proportional to the pressure value, the

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higher the pressure the stronger

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the deformation, the further the

00:01:30

sealed end of the tube will move, it turns out that

00:01:33

under the influence of pressure the bourdon tube

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will tend to straighten, dragging with it a rod, the

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movement of which, with the help of a

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gear transmission, will be converted into

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rotation of the arrow. Marks are placed on the pressure gauge scale

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that allow you to judge the

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magnitude of the pressure depending on the

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position arrows,

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like any other measuring device, a

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pressure gauge allows you to determine pressure with

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some accuracy, the accuracy of the device

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is characterized by an accuracy class, the

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accuracy class of a pressure gauge is expressed as a

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percentage, the largest permissible

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error related to its

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measurement range, the lower the number indicating the

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accuracy class of the pressure gauge, the more accurate the

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device, the more accurate the pressure gauge, the more

00:02:23

the diameter of its scale, let's consider the operation of

00:02:26

pressure gauges with different accuracy classes,

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assume that the truly measured

00:02:31

pressure in the system is 2 point one

00:02:34

hundred fifteen thousand kilograms of force per

00:02:36

centimeter; a square pressure

00:02:39

gauge with accuracy class

00:02:41

04 shows a pressure of two point

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fifty-two hundredths kilograms of force per

00:02:46

centimeter squared; the instrument error

00:02:48

is not goes beyond the permissible

00:02:50

range, a pressure

00:02:52

gauge with an accuracy class of two and a

00:02:55

half shows a pressure of 2.5

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kilograms of force per square centimeter,

00:03:00

its error is higher, but the tolerance for the

00:03:03

permissible error for it is also

00:03:05

higher, the reading of this pressure gauge does not

00:03:08

exceed the permissible error for it,

00:03:10

it turns out that despite

00:03:13

the fact that the devices show different

00:03:15

pressure values, both of them are working, it’s

00:03:17

just that one of them is designed for

00:03:19

more accurate measurements and the other is

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less accurate. For more information about the principle of operation of a

00:03:25

bourdon tube as well as the design of

00:03:27

other types of pressure gauges, read the article

00:03:30

on the website link in the description

Description:

Пружинные манометры — наиболее многочисленные и, как правило, наиболее употребительные средства измерения давлений, применяемые в холодильной технике. К этой категории в первую очередь относятся используемые в холодильных установках манометры с трубкой Бурдона и сильфонные манометры со стальной пружинящей пластиной.

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