SU907335A2 - Apparatus for automatic filling of bottles by gas - Google Patents

Description

The invention relates to pneumatic technology and can be used in gas production for filling aircraft with compressed gases.

By main auto No. 585367, there is known a device for automatically filling cylinders with gas, comprising an inlet throttle of the cylinder, a source of stabilized high pressure, a supply line, a shut-off valve, a measuring chamber with a pressure gauge, a throttle mounted on the line in front of the measuring chamber, a time-counting unit, the input of which is connected to the output of the manometer, and a counting-decisive block, the first input of which is connected to the output of the pressure gauge, the second - with the output of the time-counting unit, and the output - with a shut-off valve [1].

The disadvantage of this device is its low accuracy, since it does not take into account the effect of gas heating on pressure when filling a cylinder with gas. The true pressure inside the cylinder after cooling differs from the set pressure by an amount directly proportional to the ratio of the absolute temperature of the gas after and before the cylinder is filled with gas. This error is greater, the greater the value of the specified pressure.

The purpose of the invention is to increase the accuracy of ⁵ filling cylinders to a given pressure by improving the quality of control.

The goal is achieved in that the device is provided with a temperature sensor installed pas cylinder housing ¹⁰ and Cpd nennym with resolver unit.

On the. the drawing shows a diagram of a device for automatically filling cylinders with gas.

The device comprises an input choke 1 ^{15 of} cylinder 2, a stabilized high pressure source 3, a supply line 4, a shut-off valve 5, a measuring chamber with a pressure gauge 6, a throttle 7 installed in front of the measuring chamber, ^{20 a time-} counting unit 8, the input of which is connected to the output of the pressure gauge 6, counting unit 9, the first input of which is connected to the output of the pressure gauge 6, the second with the output of the time-counting unit 8, and the output - with a shut-off valve 5, a temperature sensor 10 mounted on the wall of the cylinder 2, the output of which connected to the input of the resolver unit 9. ₅

The device operates as follows. From the stabilized pressure source 3, through the shut-off distributor 5, the gas enters the measuring chamber through the inlet line 4, in front of which the measuring choke 7 is installed. Next, the gas through the inlet choke 1 fills the cylinder 2. A pressure gauge 6 is connected to the measuring chamber, the electric output of which is supplied to time-counting unit 8 and (5 counting-solving block 9. Time-counting block 8 also gives a signal to counting-resolving block 9.

A temperature sensor 10 is installed on the cylinder 2, which gives the temperature value before and after filling the cylinder 2 with gas to a predetermined pressure in the counting-decisive block 9. The output signal of the counting-decisive block 9 is fed to the shut-off valve 5. 25

The following numerical data are entered into the counting-decisive unit 9: source pressure P _о , pneumatic conductivity of the measuring choke ct, volume of the measuring chamber

constant C, volume balloon V ₂ , given new filling pressure balloon P ₂ , absolute share wall temperature balloon before filling cue to ₂ .

On the monometer, the output contacts are set to the value of the control pressures 1 \ and P ₄ . During filling, time intervals 1e and t ₂ are entered into the counting-decisive block 9, corresponding to the moments when the control pressures P ₃ and P _{4 are} reached.

When the pressure in cylinder 2 reaches a value of 40 equal to the given value of Р ₂ , the absolute temperature of the cylinder wall К is entered into the counting-decisive block 9; filling of cylinder 2 continues to pressure

P * 'P ^ 4.

G% · Kq. 45

Counting-decisive unit 9 according to one of the above formulas calculates the filling time of the cylinder 2 to a given pressure.

For the case where the throttle 7 operates in the supercritical mode, and the input inductor 50 1 vessel 2 - the subcritical in linear mode, the dependence is of the form _r p ₄ -p ₅ 'I ¹ ca. P _oi t _a -tp 5!

For the case when the throttle 7 operates in a subcritical linear mode, and the input throttle 1 of the cylinder 2 in the supercritical mode, the dependence has the form

where t |, t ₂ - time to achieve control pressures;

Po is the stabilized pressure of the source;

Pi is the pressure in the measuring chamber;

P ₂ is the preset cylinder filling pressure;

P ₃ , P ₄ - control pressure in the measuring chamber;

f - pneumatic conductivity of the measuring throttle;

Vi- volume of the measuring chamber; V ₂ - the volume of the filled cylinder; C is the constant of the Clapeyron-Mendeleev law with time T necessary for filling the balloon to a predetermined pressure;

K) is the absolute temperature of the cylinder wall after filling to a predetermined pressure;

K ₂ - the absolute temperature of the cylinder wall before filling (ambient temperature).

After the expiration of time T, a command is issued to the shut-off valve 5 and filling stops.

When the gas is cooled to ambient temperature (isochoric process), the pressure in the cylinder 2 is equal to the set value.

The use of the device will improve the accuracy of filling gas cylinders to a predetermined pressure.

Claims (2)

With the output time of the counting unit 8, and the output with the shut-off valve 5, the temperature sensor 10 mounted on the wall of the cylinder 2, the output of which is connected to the input of the counting-decisive unit 9.j The device works as follows. From the source 3 of the stabilized pressure, through the stop valve 5 through the supply line 4, the gas enters the measuring chamber, in front of which the measuring throttle 7 is installed. Next, through the inlet throttle, the gas fills the cylinder 2. A pressure gauge 6 is connected to the measuring chamber, the electrical output of which is supplied to the time of the suction unit 8 and 5 by the counting unit 9. The time of the counting unit 8 also sends a signal to the counting unit 9. A temperature sensor 0 is installed in the balloon 2, which outputs temperature before and after filling the cylinder 2 with gas to a predetermined pressure in the counting unit 9. The output signal of the counting unit 9 is fed to the stop valve 5. In the counting unit 9 the following numerical data is entered: source pressure P o ) pneumatic conductivity of the measuring droplet dl, the volume of the measuring chamber V ,, constant С, the volume of the cylinder V2, given before the filling of the cylinder P2 ,, the absolute temperature of the wall of the cylinder before filling K2. The sensor is used to set the output contacts to the value of the control pressures P and P4. During filling, the time interval ti and t2 are entered into the counting unit 9 and correspond to the control pressure of the relay and the pressure in the tower 2 has a value equal to the given P2, the value of the absolute temperature of the cylinder wall K is entered into the countable meter. The filling of the cylinder 2 in this case continues until the pressure of the RRRH 45. The counting decision unit 9, according to one of the above formulas, calculates the time for filling the cylinder 2 to a predetermined pressure. For the case when the choke 7 is operating in the supercritical mode, and the input choke 50 1 of the cylinder 2 is in the subcritical linear mode, the dependence is 1. v p.c-p4 / f .1. 4 - (Cd. Р itn-t О, when the throttle 7 is operating in the subcritical linear mode, and the input com is where RZ P is on the pre p p p a n p y p o r p i n d p t dt d dan d ctr. F choke 1 of cylinder 2 - in supercritical mode, the dependence is T --- k. Ci Vip, ti, t2 - time to reach control pressures; PO - stabilized source pressure; PI - pressure in the measuring chamber; P2 - set pressure of the balloon; , P4 - control pressure in the measuring chamber; cL - pneumatic conductivity of the measuring throttle; Vj- volume of the measuring chamber; - the volume of the cylinder to be filled; C is the Clapeyron – Mendeleev law constant with the time T needed to fill the cylinder to a predetermined pressure; KI is the absolute temperature of the cylinder wall after filling to a predetermined pressure; After the time T has expired, the distributor 5 command is given and the filling is diluted. When the gas is cooled to ambient temperature (an isochoric process) the pressure in cylinder 2 is equal to the specified value. The use of the device will make it possible to increase the spacing of filling the cylinders with gas to a high pressure. The formula of the invention is the device of automatic filling of gas with a gas according to auth.St. No. 585367, in order to increase the accuracy of filling the ballo of a given pressure by improving control, it is equipped with a temperature sensor mounted on the body and connected to the counting ohm. Sources of information that are considered in the examination of the USSR Author's Certificate No. 585367, 17 C 5/06, 1976.