SU667813A1

SU667813A1 - Container volume measuring method

Info

Publication number: SU667813A1
Application number: SU772439681A
Authority: SU
Inventors: Сергей Витальевич Матвеев; Владимир Иде-Лейбович Шварцман
Original assignee: Предприятие П/Я В-8597
Priority date: 1977-01-12
Filing date: 1977-01-12
Publication date: 1979-06-15

Description

(54) СПОСОБ ОПРЕДЕЛЕНИЯ ОБЪЕМА ЕМКОСТИ(54) METHOD FOR DETERMINING VOLUME OF CAPACITY

1one

Изобретение может быть использовано, в частности, дл точного определени объемов замкнутых герметичных емкостей.The invention can be used, in particular, to accurately determine the volumes of closed sealed containers.

Известен способ определени объема емкости с помощью эталонной емкости путем уравнивани начального произвольного Да влени газа в измер емой и эталонной емкост х , перепуска части газа из исследуемой емкости в эталонную и определени их искомого объема по изменению в них давлени 1. Недопустимость избыточного давлени в одной из емкостей ограничивает область применени способа.A known method for determining the volume of a tank using a reference tank is achieved by equalizing the initial arbitrary gas supply in the measured and reference tanks, bypassing a part of the gas from the test tank to the reference one and determining their desired volume based on the pressure change in them 1. Inadmissibility of overpressure in one of capacity limits the scope of application of the method.

Кроме того, не обеспечиваетс высока точность измерени объема за счет того, что при измерении давлени не учитываетс и не исключаетс систематическа ошибка, вызванна изменением внутренней энергии газа при его перепуске из одной емкости в другую.In addition, the volume measurement is not highly accurate due to the fact that the pressure measurement does not take into account or eliminate the systematic error caused by the change in the internal energy of the gas when it passes from one tank to another.

Известен- также способ определени объема емкости путем наддува ее сжатым газом до давлени выше атмосферного и последующего вытекани из нее сжатого газа с посто нным расходом, причем об объемеThere is also known a method for determining the volume of a container by pressurizing it with compressed gas to a pressure above atmospheric and subsequent outflow of compressed gas from it with a constant flow rate.

емкости суд т по времени падени давлени от одного уровн до другого 2.The vessels are judged by the time of pressure drop from one level to another 2.

Однако при осуществлении этого способа необходимо поддерживать посто нство расхода вытекающего газа, дл чего в измерительной схеме используютс расходомер и .регул тор. Кроме того, избыточное давление в емкости ограничивает область применени способа.However, in carrying out this method, it is necessary to maintain the flow rate of the outgoing gas, for which purpose in the measuring circuit a flow meter and a regulator are used. In addition, the overpressure in the vessel limits the scope of application of the method.

Цель изобретени - упрощение способа и расширение области его применени .The purpose of the invention is to simplify the method and expand its scope.

Цель достигаетс тем, что по предлагаемому способу выравнивают давление газа в измер емой и эталонной емкост х, откачивают газ из обеих емкостей по одинаковым магистрал м до одинакового давлени , измер ют врем их откачки, а объем измер емой емкости наход т как произведение объема эталонной емкости на отношение времени откачки измер емой емкости к времени откачки эталонной.The goal is achieved by using the proposed method to equalize the gas pressure in the measured and reference tanks, pump out gas from both tanks along the same lines to the same pressure, measure their pumping time, and measure the volume of the tank being measured on the ratio of the pumping time of the measured capacitance to the pumping time of the reference.

Так как врем откачки замкнутой емкости может быть определено по формулеSince the pumping time of a closed tank can be determined by the formula

Claims

t (), where V -5- volume of pumped capacity; PO is the initial pressure in the tank; p is the residual pressure in the tank; and - conductivity of the pumping line; Q (UP) is the flow of pumped gas, then when pumping two tanks with volume Vi and Vi to the same residual pressure of the field through the line of equal resistance, we can derive the relation: ti Xj f dP / Q (UPj ti v 5 dP / 4 ( UPr where Vi, Va are the volumes of the containers, ti, ti are the pumping times of the respective containers, and PI is the error due to the change in the internal energy of the gas when measuring the pressure in the first vessel; L Pa is the error due to the change in the internal energy of the gas when measuring the pressure in the second capacity. Error measuring residual pressure due to the identity of the conditions Both containers are the same in both cases, i.e., PI A PI or .P dP V t (Vf) p. Therefore, -1 - or Vs. Vi 4 Thus, due to the identity of the pumping conditions, systematic error is eliminated due to the change in the internal energy of the gas. The method is carried out as follows: In the reference tank with volume V | and the measured tank with volume Vi, the same initial pressure is set. To improve the accuracy of the measurement, the reference and measured tank are chosen equal to the volume tolerance for fabrication. The pumping line is connected to the reference tank and pumped to pressure P, measuring pumping time tj. The pumping line is connected to the measured capacity and pumped to a pressure Pi PI, measuring the pumping time ti. The measured volume is calculated using the formula Ug Vi. 4h. where ti, ti is the time from reference and measured capacitance, respectively. The invention of the method for determining the volume of a container over time of a gas pressure change from one level to another when it flows out of a container, characterized in that, in order to simplify the method of expanding its field of application, the gas pressure in the measured and reference tanks is equalized from both tanks along the same lines to the same pressure, the time of their pumping out is measured, and the volume of the measured capacity is found as a product of the volume of the reference capacity by the ratio of the time of pumping out of the measured capacity to time Pumping and reference. Sources of information taken into account in the examination 1. The author's certificate of the USSR No. 210408, cl. G 01 F 17/00, 1966.

2. US patent number 3744306, cl. 73-149, 1972.