SU1204936A2 - Arrangement for determining velocity and volume of releasing gases - Google Patents

Description

one

The invention relates to the field of instrumentation and can be used to investigate gasification in laboratories and production conditions.

The purpose of the invention is to improve the measurement accuracy.

The drawing shows a schematic diagram of the device.

A device for determining the CKOpoci and volume of evolved gases includes channels 1 of the spool element 2, to which a source of gaps is attached (not shown). Channel 3 is connected to the measuring chamber 4 and the pressure converter 5, the outputs of which are connected to the trigger inputs 6 with separate inputs. The output of the trigger 6 is connected to the input of the recorder, which includes the frequency meter 7 and the pulse counter 8, as well as the input of the actuator 9 of the spool element 2. The actuator 9 is mechanically connected to the spool 10. Channel 11 of the element 2 is connected to the atmosphere or to a constant pressure tank and channel 12 of spool 10 connects channels 1 and 3 to each other. Measuring chamber 4 is connected to positive chambers of a five-membrane comparison element 13, one negative chamber of which is connected to the output of the first sensor 14, and others n is negative chamber and the lower nozzle chambers - with the atmosphere, the lower nozzle is connected to its upper-nozzle and the upper chamber trehmembrannogo comparing element 15 through constant nny choke 16 - with the power source and the nozzle valve 17, nozzle chamber is connected with the atmosphere. The negative chamber of the three-membrane comparison element 15 is connected to the output of the second unit 18, and the upper nozzle is connected to the power source, the lower one is connected to the atmosphere. The output of the element 15 is connected to one of the inputs of the trigger 6, the output of which is also connected via a pulse 19 to its second input and to one control chamber of the valve 17, to the other control chamber of which a backwater is conducted. The pulsator 19 is built according to the well-known scheme and contains a three-membrane relay 20,

ten

2049362

air capacity 21 and variable choke 22.

The device works in the following way.

5 In the absence of a gas release and the membrane unit of the element 13, under the action of pressure from the output of the setter 14, rises. The nozzle in the lower chamber will be fully open. Therefore, the pressure at the outputs of the element 13 () is zero. The membrane unit of the element 15 under the action of pressure from the output of the second unit 18 rises and the pressure at the outlet of the element (P,) is zero. Therefore, the pressure at the outlet of the trigger 6 is also zero. The actuator 9 holds the spool 10 of the element 2 in such a position that channels 1 and 3 are connected by channel 12. The readings of the frequency meter 7 and the pulse counter 8 are zero. Under the action of the overpressure in the control chamber, the nozzle of the valve 17 is closed.

Gases from the source through channels 1, 12 and 3 enter the measuring chamber 4 and cause an increase in pressure (P) in it. As soon as the pressure Pn creates a force on the membrane unit of the element 13, beyond the force from the pressure P, the membrane unit will begin to descend. The conductivity of the lower nozzle decreases.

35 Therefore, the pressure P,} increases. Positive feedback contributes to lowering the membrane unit.

When the pressure exceeds the pressure, the membrane unit of the element

40 15 is lowered and the pressure Pi5 becomes equal to one. The signal will transfer the trigger 6 to one state. The signal P 1 will be fixed in the frequency meter 7 and the pulse counter 8

45 and using actuator 9 will move the spool 10 of element 2 so that channel 3 will be connected to channel 11 by channel 12. The process of unloading the measuring chamber 4 will begin. The signal will raise the diaphragm valve block 17, the pressure P will be equal to zero. The membrane blocks of elements 13 and 15 will rise. Pressure will become

55 equals zero. The signal Pg 1 is fed through the variable choke 22 to the pneumatic system 21 and the chamber of the three-membrane relay 20 of the pulser 19. B the pneumatic capacity 21 begins to heat up. When the pressure in the pneumatic capacity 21 of the actuation of the relay -20 is exceeded, the membrane unit is lowered and the signal Pf 1 passes to the input of the trigger 6. The membrane unit of the trigger 6 rises. The output channel of the trigger 6 through the open bottom nozzle of the element 15 is connected to the atmosphere. The pressure Pg will become zero. Valve 17 will close the nozzle. The actuator 9 will lower the spool 10, and channel 1 will be connected through channel 12 to channel 3. The filling of the measuring chamber with 4 gases from the source will begin again.

The leading edge of pulse P 1 is shifted by the pulser 19 by the time required to empty the measuring chamber 4 and to operate the pressure transducer circuit 5.

The valve 17 serves to release the pressure in the positive feedback channel of the five -membrane element of comparison 13. The three-membrane element of the comparison 15 and the second unit 18 serves to increase the reliability of triggering of the trigger 6.

The velocity of the gas gaps in the device is judged by the frequency 00 of the switching of the trigger 6, which is measured by the frequency meter 7 and is related to the gas emission rate by the dependence,.

where V is the volume of the measuring chamber 4;

 c the magnitude of the operation of element 13 at a given pressure

R - universal gas constant} T - absolute temperature

gas in the measuring chamber 4.

The amount of released gases V is determined by the number of pulses N received at counter 8,

VPc 1 -S ... J

 RT

Thus, the information about the measured parameters at the output of the device is presented in the form of a sequence of rectangular pulses, the frequency of which comparison is proportional to the velocity of the gas gaps, and the number of pulses is proportional to the amount of released gas.

Compiled by G. Belousov Editor O. Kolesnikov Tehred T. Tulik Proofreader M. Maksimishinets

Order 8516/41 Circulation 702 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

204936

Branch PPP Patent, Uzhgorod, st. Project, 4

Claims (1)

DEVICE FOR DETERMINING THE SPEED AND VOLUME OF EMISSIBLE GASES according to ed. No. 618680, characterized in that, in order to increase the measurement accuracy, the pressure transducer is made of five-membered and three-membered comparison elements, two adjusters, a constant throttle, valve and impulse, while the positive chambers of the five-membered comparison element are connected to the measuring chamber, one negative the chamber is connected to the output of the first setter, the other negative and lower nozzle chambers are connected to the atmosphere, the upper nozzle chamber is connected to its nozzle, to the nozzle of the lower nozzle chamber, to valve scrap, with a positive chamber of the three-membrane comparison element and through a constant choke to the power source, the negative chamber of the three-membrane comparison element is connected to the output of the second master, the upper nozzle of the three-membrane comparison element is connected to the power source, the lower nozzle is connected to the atmosphere, and the output a three-membered comparison element is connected to one of the inputs of the trigger with separate inputs, the output of which is connected to the valve control chamber and, through the pulser, to its second input, The nozzle chamber of the valve is connected to the atmosphere.