SU987446A1

SU987446A1 - Device for sampling liquids

Info

Publication number: SU987446A1
Application number: SU813314174A
Authority: SU
Inventors: Станислав Данилович Лутов; Семен Ефимович Радинский; Юрий Кириллович Цыганков; Александр Иванович Загоруйко; Альберт Алексеевич Сорокин; Татьяна Ефимовна Орлова
Original assignee: Ордена Ленина Институт Кибернетики Ан Усср; Завод "Молдавизолит"
Priority date: 1981-07-13
Filing date: 1981-07-13
Publication date: 1983-01-07

Description

Изобретение относится к контролю и автоматизации химико-технологических процессов и может быть использовано при отборе проб для контроля про- 5 текания реакции синтеза фенолформальдегидных связующих в производстве слоистых пластиков.The invention relates to the control and automation of chemical-technological processes and can be used in sampling to control the progress of the synthesis of phenol-formaldehyde binders in the production of laminated plastics.

Известно устройство для отбора проб жидкости, включающее рабочую щ емкость,· соединенную с пробозаборной и вакуумной магистралями трубопроводами с соответствующей запорной арматурой £13,A device for sampling a liquid is known, including a working tank connected with sampling and vacuum manifolds by pipelines with corresponding shutoff valves £ 13,

Однако отбор проб жидкости, находящейся под разрежением, с помощью такого устройства затруднен. Кроме того, оно сложно в эксплуатации и не надежно в работе.However, sampling the liquid under vacuum with this device is difficult. In addition, it is difficult to operate and not reliable in operation.

Известно также устройство для отбора проб жидкости, содержащее заборный трубопровод с установленными на нем последовательно измерительной ячейкой и пробоотборником с патрубками ввода и вывода жидкости, выполнен- 25 ным в виде емкости с крышкой и подпружиненным клапаном, расположенным в заборном трубопроводе, и эжектор £2].A device for sampling a liquid is also known, comprising an intake pipe with a measuring cell installed in series with a sampler with liquid inlet and outlet pipes made in the form of a container with a lid and a spring-loaded valve located in the intake pipe, and an ejector £ 2] .

Недостатками этого устройства являются сложность конструкции, а так- 30 же трудность отбора проб жидкости/ находящейся под разряжением.The disadvantages of this device are the complexity of the design, as well as the difficulty of sampling the liquid / under discharge.

Наиболее бливким к изобретению по технической сущности является устройство для отбора проб жидкости, содержащее корпус и датчик перепада давления, выполненный в виде измерительных трубок, одна из которых подсоединена к сливной, а другая через трехходовой кран к дозирующей камерам корпуса, между которыми размещен с возможностью перемещения поршень с индикатором его положения, установленным на внешней поверхности корпуса [3 3.The most inventive technical invention is a liquid sampling device containing a housing and a differential pressure sensor, made in the form of measuring tubes, one of which is connected to a drain, and the other through a three-way valve to the metering chambers of the housing, between which it can be moved a piston with an indicator of its position mounted on the outer surface of the housing [3 3.

Недостатками известного устройства являются невысокая представительность состава отбираемой пробы, поскольку при отборе очередной пробы в дозирующую камеру поступает жидкость, которая осталась в измерительной трубке , после отбора предыдущей пробы, невозможность отбора проб жидкости, находящейся под избыточным разрежением, и низкая надежность, поскольку при отборе проб вязких самополимеризующихся жидкостей возможно залипание поршня.The disadvantages of the known device are the low representativeness of the composition of the sample taken, because when taking another sample, the liquid that remains in the measuring tube enters the metering tube after taking the previous sample, the inability to take samples of the liquid under excessive vacuum, and low reliability, since when sampling viscous self-polymerizing liquids sticking of the piston is possible.

Цель изобретения - повышение эффективности устройства за счет повы шенйя представительности состава пробы и расширения области применения устройства путем использования его при отборе проб вязких самополимеризующихся жидкостей.The purpose of the invention is to increase the efficiency of the device by increasing the representativeness of the sample composition and expanding the scope of the device by using it when sampling viscous self-polymerizing liquids.

Поставленная цель достигается тем, что устройство снабжено приводом перемещения поршня, блоком управления подключенным входом к индикатору положения поршня, а соответствующими выходами - к управляющим входам привода и трехходового крана, и гидрозатворами, каждый из которых размещен на входе измерительной трубки, при этом корпус выполнен с пазом в верхней части внутренней поверхности.This goal is achieved by the fact that the device is equipped with a piston displacement actuator, a control unit connected to the input to the piston position indicator, and corresponding outputs to the actuator and three-way valve control inputs, and hydraulic locks, each of which is located at the inlet of the measuring tube, while the housing is made with a groove in the upper part of the inner surface.

При этом входное отверстие измерительной трубки, подключенной к дозирующей камере, выполнено в виде расширяющегося патрубка.In this case, the inlet of the measuring tube connected to the metering chamber is made in the form of an expanding nozzle.

Кроме того, нижний край паза выполнен на уровне, соответствующем объему отбираемой пробы.In addition, the lower edge of the groove is made at a level corresponding to the volume of the sample taken.

На фиг.1 представлена блок-схема устройства для отбора проб жидкости,- на фиг.2 -4 - трехходовой кран в рабочих положениях, разрез.In Fig.1 presents a block diagram of a device for sampling liquid, in Fig.2-4 - three-way valve in operating positions, section.

Устройство состоит из корпуса 1 и датчика перепада давления, выполненного в виде измерительных трубок 2 и 3, одна из которых (3 ) подсоединена к сливной камере 4, а другая (2 через трехходовой кран 5 к дозирующей камере 6 корпуса 1, между которыми установлен поршень 7 с индикатором 8 его положения, расположенным на внешней поверхности корпуса 1. Корпус 1 имеет на внутренней поверхности паз (.полость) 9. Датчик перепада давления снабжен гидрозатворами 10, расположенными у входных отверстий измерительных трубок 2 и 3, одно из которых выполнено в виде расширяющегося патрубка 11. Поршень 7 связан с приводом 12, подключенным к выходу управляющего блока 13.The device consists of a housing 1 and a differential pressure sensor, made in the form of measuring tubes 2 and 3, one of which (3) is connected to the drain chamber 4, and the other (2 through a three-way valve 5 to the metering chamber 6 of the housing 1, between which there is a piston 7 with an indicator 8 of its position located on the outer surface of the housing 1. The housing 1 has a groove on the inner surface (. Cavity) 9. The differential pressure sensor is equipped with hydraulic locks 10 located at the inlet of the measuring tubes 2 and 3, one of which is made in the form exp the range of this nozzle 11. The piston 7 is connected with a drive 12 connected to the output of the control unit 13.

Корпус 1 имеет прозрачный участок ’14 для визуального контроля.Case 1 has a transparent ’14 section for visual inspection.

Устройство работает следующим образом.The device operates as follows.

Процесс синтеза фенолформальдегидных связующих проводят в реакторе закрытого типа, снабженном ротационной мешалкой, причем на различных стадиях процесса реакционная смесь находится под атмосферным давлением или разрежением.The synthesis of phenol-formaldehyde binders is carried out in a closed reactor equipped with a rotary stirrer, and at various stages of the process, the reaction mixture is under atmospheric pressure or vacuum.

Устройство устанавливают, например, с помощью герметически прилегающего фланца в технологическое отверстие, расположенное в верхней.части, реактора, снабженного ротационной мешалкой (не показаны ), вращение которой создает непрерывное движение реакционной смеси. При этом измери-. тельные трубки 2 и 3 погружают в жидкость так, что расширяющийся патрубок 11 измерительной трубки 2 обра щен навстречу потоку. После этого осуществляют подготовку устройства к работе.The device is installed, for example, by means of a hermetically sealed flange in a technological hole located in the upper part of a reactor equipped with a rotary mixer (not shown), the rotation of which creates a continuous movement of the reaction mixture. In this case, measure. The telescopic tubes 2 and 3 are immersed in the liquid so that the expanding nozzle 11 of the measuring tube 2 is facing towards the flow. After that, the device is prepared for operation.

По команце из управляющего блока 13 поршень 7 по указателю 8 устанавливается напротив полостей 9, обеспечивая тем самым сообщение между камерами 4 и 6 корпуса 1, а трехходовой кран 6 устанавливается в положение Заполнение (фиг.2/. Через сливное отверстие трехходового крана 5 корпус 1 и измерительные трубки 2 и 3 ' заполняются одним из компонентов сырья, например водой, после чего трехходовой кран 5 по команде из управляющего блока 13 переводится в положение Проток (фиг.З). Эту операцию можно производить предварительно при пустом реакторе, поскольку гидрозатворы 10 препятствуют вытеканию жидкости из устройства.According to the command from the control unit 13, the piston 7 according to the pointer 8 is installed opposite the cavities 9, thereby ensuring communication between the chambers 4 and 6 of the housing 1, and the three-way valve 6 is set to the Fill position (Fig. 2 /. Through the drain hole of the three-way valve 5, the housing 1 and the measuring tubes 2 and 3 'are filled with one of the components of the raw material, for example, water, after which the three-way valve 5 is transferred to the Flow position on the command from the control unit 13. This operation can be performed previously with the reactor empty, since drozatvory 10 prevent fluid leakage from the device.

После загрузки и включения мешалки устройство готово к отбору проб. Вращение мешалки вызывает направленное движение жидкости в реакторе, благодаря чему создается динамическое давление, что обеспечивает непрерывное протекание реакционной смеси через расширяющийся патрубок 11, измерительную трубку 2, дозирующую 6 и сливную 4 камеры корпуса 1 и измерительную трубку 3.After loading and turning on the agitator, the device is ready for sampling. The rotation of the mixer causes a directional movement of the liquid in the reactor, which creates dynamic pressure, which ensures the continuous flow of the reaction mixture through the expanding pipe 11, the measuring tube 2, dosing 6 and the drain 4 of the camera body 1 and the measuring tube 3.

Для отбора пробы по команде из управляющего блока 13 поршень 7 посредством привода 12 перемещается вниз до положения, в котором прекращается сообщение между камерами 4 и 6 , т.е. до нижней кромки полостей 9. Сигнал об этом положении поршня 7 от указателя 8 поступает в управляющий блок 13, который выдает команду на управляющий вход трехходового крана 5, переключая его в положение Слив (фиг.4). Продолжая двигаться вниз, поршень 7 вытесняет пробу через сливное отверстие трехходового крана 5 наружу. Нижнее положение поршня 7 по указателю 8 фиксируется управляющим блоком 13, который выдает команду на возврат трехходового крана 5 и поршня 7 в исходное состояние. Наличие пробы в корпусе контролируется визуально через прозрачный участок 14 на корпусе 1.To take a sample on command from the control unit 13, the piston 7 is moved down to the position where the communication between the chambers 4 and 6, i.e. to the lower edge of the cavities 9. The signal about this position of the piston 7 from the pointer 8 enters the control unit 13, which issues a command to the control input of the three-way valve 5, switching it to the Drain position (Fig. 4). Continuing to move down, the piston 7 forces the sample out through the drain hole of the three-way valve 5. The lower position of the piston 7 in the pointer 8 is fixed by the control unit 13, which issues a command to return the three-way valve 5 and the piston 7 to its original state. The presence of a sample in the housing is visually controlled through a transparent portion 14 on the housing 1.

Применение изобретения позволяет повы&ить качество выпускаемых фенолформальдегидных связующих и снизить потери сырья при их изготовлении на 0,5%, что дает экономический эф- 1 фект с учетом затрат на внедрение и эксплуатацию устройства 68 тыс. руб,в год.The application of the invention allows to increase the quality of the produced phenol-formaldehyde binders and to reduce the loss of raw materials in their manufacture by 0.5%, which gives an economic effect of 1 taking into account the cost of introducing and operating the device 68 thousand rubles a year.

Claims

The invention relates to the control and automation of optical technological processes and can be used in sampling for monitoring the progress of the reaction of the synthesis of phenol-formaldehyde bonds in the production of laminated plastics. A device for sampling a liquid is known, which includes a working tank, which is connected to the sampling and vacuum lines by pipelines with a corresponding stop valve tl. However, it is difficult to sample the liquid under vacuum using such a device. In addition, it is difficult to operate and not reliable in operation. It is also known a device for sampling a liquid, which contains a sampling pipeline with a measuring cell and a sampling tube mounted on it in series with a liquid inlet and outlet nozzle made in the form of a tank with a lid and a spring-loaded valve located in the intake manifold, and an ejector. Disadvantages of this The devices are design complexity as well as the difficulty of sampling liquids under discharge. The most intriguing to the invention by its technical essence is a device for sampling a fluid, comprising a housing and a pressure differential sensor, made in the form of measuring tubes, one of which is connected to the drain, and the other through a three-way valve to the dispenser to the housing Aler, with which the ability to move the piston with its position indicator mounted on the outer surface of the housing 33. The disadvantages of the known device are the low representativeness of the composition of the sample being taken, When another sample is taken, the liquid that remains in the measuring tube enters the dosing chamber after the previous sample is taken, the impossibility of sampling the liquid under excessive vacuum and the reliability is low, because when sampling viscous self-polymerizing liquids, the piston may stick. The purpose of the invention is to increase the efficiency of the device by increasing the representativeness of the sample composition and expanding the field of application of the device by using it in sampling viscous self-polymerizing liquids. The goal is achieved by the fact that the device is equipped with a piston displacement actuator, a control unit connected to the piston position indicator, and corresponding outputs to the control inputs of the drive and three-way crane, and hydroelectric valves, each of which is located at the inlet of the measuring tube, while the housing is made with a groove at the top of the inner surface. In this case, the inlet of the measuring tube connected to the dosing chamber is made in the form of an expanding tube. In addition, the lower edge of the groove is made at a level corresponding to the volume of the sample being taken. Fig. 1 is a block diagram of a liquid sampling device; FIGS. 2-4 show a three-way crane in operating positions, a slit. The device consists of a housing 1 and a differential pressure sensor, made in the form of measuring tubes 2 and 3, one of which (3) is connected to the drain chamber 4, and the other (2 through a three-way valve 5 to the dosing chamber b of housing 1, between which a piston is mounted 7 with an indicator 8 of its position located on the outer surface of the housing 1. The housing 1 has a groove (cavity) on the inner surface 9. The differential pressure sensor is equipped with hydraulic locks 10 located at the inlet openings of the measuring tubes 2 and 3, one of which is the expanding nozzle 11. The piston 7 is connected to the drive 12 connected to the output of the control unit 13. The housing 1 has a transparent section 14 for visual inspection. The device works as follows. The synthesis of phenol formaldehyde binders is carried out in a closed-type reactor. equipped with a rotary stirrer, and at various stages of the process the reaction mixture is under atmospheric pressure or vacuum. The device is installed, for example, with the help of a hermetically adjacent flange in the technological opening, located in the upper part, of the reactor equipped with a rotary mixer not shown), the rotation of which creates a continuous movement of the reaction mixture. At the same time, the measuring tubes 2 and 3 are immersed in a liquid so that the expanding nozzle 11 of the measuring tube 2 is directed towards the flow. After this, the device is prepared for operation. On command from the control unit 13, the piston 7 according to the indicator 8 is installed opposite the cavities 9, thereby providing communication between the chambers 4 and 6 of the housing 1, and the three-way valve b is set to the Filling position 1, 2, through the drain hole of the three-way valve 5, the housing 1 and measuring tubes 2 and 3 are filled with one of the components of the raw material, for example water, after which the three-way valve 5 is transferred by the command from the control unit 13 to the duct of FIG. 3). This operation can be carried out beforehand in an empty reactor, since the water locks 10 prevent the liquid from flowing out of the device. After the agitator is loaded and turned on, the device is ready for sampling. The rotation of the stirrer causes directional movement of the fluid in the reactor, thereby creating a dynamic pressure, which ensures the continuous flow of the reaction mixture through the expanding nozzle 11, the measuring tube 2, the metering 6 and the drain 4 chambers of the housing 1 and the measuring tube 3. To take a sample from a command In the control unit 13, the piston 7 is moved downward by the actuator 12 to a position in which communication between the chambers 4 and 6 ceases, i.e. to the lower edge of the cavities 9. The signal about this position of the piston 7 from the pointer 8 enters the control unit 13, which issues a command to control the input of the three-way valve 5, switching it to the Drain position (Fig. 4. Continuing down, the piston 7 is displaced The test sample through the drain port of the three-way valve 5 is outward. The lower position of the piston 7 according to the indicator 8 is fixed by the control unit 13, which issues a command to return the three-way valve 5 and the piston 7 to its original state. The presence of the sample in the housing is controlled visually through the transparent The first section 14 on the housing 1. Application of the invention allows to increase the quality of the injected phenol-Emaldehyde binders and reduce the loss of raw materials in their manufacture by 0.5%, which gives an economic effect, taking into account the cost of implementing and operating the device 68 thousand rubles. , per year. Formula of the invention 1. A device for sampling a liquid, comprising a housing and a sensor