SU862001A2

SU862001A2 - Pressure difference relay

Info

Publication number: SU862001A2
Application number: SU802875397A
Authority: SU
Inventors: Геннадий Иванович Башаров; Владимир Леонидович Гудименко; Виталий Иванович Жульков; Валентин Александрович Нефедов; Галина Федоровна Соколова; Анатолий Рувимович Чугунов
Original assignee: Предприятие П/Я А-1665
Priority date: 1980-01-25
Filing date: 1980-01-25
Publication date: 1981-09-07

Description

Изобретение относится к системам контроля и автоматического управления и может быть применено в пневмоавтоматике .The invention relates to control systems and automatic control and can be applied in pneumatic automation.

11о основному авт.св. № 513282.известно реле разности давлений, исполь- ⁵зуемое в системах контроля и автоматического управления пневмоавтоматики. Оно содержит корпус¹, внутри которого установлены мембрана с электроконтактной группой и пакет анероидных коробок £1 ].11o main autos No. 513282. A known differential pressure switch is used ⁵ in control and automatic control systems of pneumatic automation. It contains a housing ¹ , inside which a membrane with an electrocontact group and a package of aneroid boxes £ 1] are installed.

Данное реле разности давлений реализует статическую характеристику, имеющую вид гиперболической кривой, близко совпадающую со статической характеристикой датчика типа трубки Вентури. Реализация гиперболической характеристики основана на изменении объема газа, заключенного внутри полости, образованной мембраной и пакетом анероиднЫх коробок.This differential pressure switch implements a static characteristic that has the form of a hyperbolic curve, which closely matches the static characteristic of a sensor such as a venturi. The implementation of the hyperbolic characteristic is based on a change in the volume of gas enclosed within the cavity formed by the membrane and the package of aneroid boxes.

Однако при этом реле разности давлений имеет температурную погрешность, так как температура газа, проходящего по датчику, всегда несколько отлична от температуры газа, заключенного внутри этой полости. Это объясняется тем, что давления газа, высокое и низкое, отбираемые от датчика, сначала поступают в его коллекторы, затем в выходные секции коллекторов, а затем по трубопроводам - во внутренние полости корпуса реле разности давления. При этом поступающий газ охлаждается или наоборот нагревается температурой газовой среды, окружающей датчик, реле разности давлений и соединяющие их трубо пров оды.However, in this case, the differential pressure switch has a temperature error, since the temperature of the gas passing through the sensor is always slightly different from the temperature of the gas enclosed inside this cavity. This is because the gas pressure, high and low, taken from the sensor, first comes to its collectors, then to the output sections of the collectors, and then through pipelines to the internal cavities of the differential pressure switch housing. In this case, the incoming gas is cooled or, on the contrary, heated by the temperature of the gaseous medium surrounding the sensor, pressure difference relays, and pipelines connecting them.

Целью изобретения является компенсация температурной погрешности известного реле разности давлений.The aim of the invention is to compensate for the temperature error of the known pressure difference relay.

Это достигается тем, что реле разности давлений снабжено герметичным кожухом со штуцерами для подвода.высокого и низкого давления, причем корпус реле размещен в полости кожуха, а его штуцер низкого давления соеди ней трубопроводом с полостью корпуса_sв которой размещен пакет анероидных коробок.This is achieved by the fact that the differential pressure switch is equipped with a sealed casing with fittings for supplying high and low pressure, moreover, the relay casing is placed in the casing cavity, and its low pressure fitting is connected by a pipeline to the casing cavity _s in which the package of aneroid boxes is placed.

Такое конструктивное решение исключает. температурную погрешность реле разности давлений, так как теперь газ, проходящий через датчик, будет являться для реле не только рабочей средой, но и окружающей, поскольку он будет заполнять камеру, в которой полностью заключено реле разности давлений.This design solution eliminates. temperature error of the differential pressure switch, since now the gas passing through the sensor will not only be a working medium for the relay, but also the surrounding one, since it will fill the chamber in which the differential pressure switch is completely enclosed.

На чертеже изображено описываемое реле, общий вид.The drawing shows the described relay, General view.

Реле разности давлений содержит кожух Ί и корпус реле 2. Кожух 1 представляет собой камеру, внутри которой установлена мембрана 3 с электрокоитактной группой и расположены штуцер 4 коллектора высокого давления 5 и штуцер >6 коллектора низкого давления 7» Коллекторы 5 и 7 закреплены на датчике 8 типа трубки Вентури. Корпус реле 2, внутри которого установлена мембрана 9, выполненная в виде пакета анероидных коробок, и трубопровод 10, соединяющий корпус реле 2 с коллектором низкого давления 7, смонтироваш внутри кожуха 1. Высокое давление отбираемое от датчика 8, поступает в коллектор 5, затем через штуцер 4 в кожух I. НизкоеThe differential pressure switch contains a casing Ί and a relay housing 2. Casing 1 is a chamber inside which a membrane 3 with an electro-contact group is installed and a nozzle 4 of a high-pressure manifold 5 and a nozzle> 6 of a low-pressure manifold 7 are located »Collectors 5 and 7 are mounted on the sensor 8 type venturi. The housing of the relay 2, inside which a membrane 9 is installed, made in the form of a package of aneroid boxes, and the pipeline 10 connecting the housing of the relay 2 to the low-pressure manifold 7, mounted inside the housing 1. The high pressure taken from the sensor 8 enters the manifold 5, then through fitting 4 into the casing I. Low

862001 4 давление поступает через коллектор 7 и штуцер 6 по трубопроводу 10 внутрь корпуса реле 2. При этом рабочая среда с давлением Р^ будет в то же время окружающей средой для корпуса реле 2.862001 4 the pressure enters through the manifold 7 and the nozzle 6 through the pipeline 10 into the body of the relay 2. In this case, the working medium with pressure P ^ will be at the same time the environment for the relay housing 2.

Использование изобретения обеспечивает повышенную точность реле разности давлений за счет исключения температурной погрешности, что особенно важно для его применения в пневмосистемах объектов, испытывающих воздействие изменяющейся температуры среды, окружающей всю пневмосистему.The use of the invention provides increased accuracy of the pressure difference switch due to the exclusion of temperature error, which is especially important for its use in the pneumatic systems of objects experiencing the influence of the changing temperature of the environment surrounding the entire pneumatic system.

Claims

The invention relates to control and automatic control systems and can be applied in pneumatic automation. tlo main auth. No. 513282. known differential pressure switch, used in the systems of control and automatic control of pneumatic automation. It includes a housing inside which a membrane with an electrocontact group and aneroid box package are installed {| . This differential pressure switch implements a static characteristic that has the form of a hyperbolic curve that closely matches the static characteristic of a Veituri tube type sensor. The implementation of the hyperbolic characteristic is based on the change in the volume of gas enclosed by the anutri polostk formed by the membrane and the pack of aneroid boxes. However, in this case, the differential pressure relay has a temperature error since the temperature of the gas passing through the sensor is always somewhat different from the temperature of the gas contained inside this cavity. This is due to the fact that gas pressures, high and low, taken from the sensor, first flow into its manifolds, then into the output sections of the manifolds, and then through pipelines into the internal cavities of the pressure differential relay housing. In this case, the incoming gas is heated or, on the contrary, is heated by the temperature of the gaseous medium surrounding the sensor, the differential pressure switch and the pipes connecting them. The purpose of the isobrete is to compensate for the temperature error of the known differential pressure switch. This is achieved by the fact that the differential pressure switch is equipped with a hermetic casing with fittings for supplying high and low pressure, the relay housing is located in the housing cavity, and its low pressure fitting is connected to the housing cavity containing the package of aperoid boxes. Such a constructive solution excludes the temperature error of the differential pressure switch, since now the gas passing through the sensor will be for the relay not only the working medium, but also the surrounding one, since it will fill the chamber in which the differential pressure switch is completely enclosed. The drawing shows the described relay, general view. The differential pressure switch contains a casing and a relay 2 casing. Casing I is a chamber inside which a 3 C diaphragm is installed. An electrocontact group and a fitting 4 of a high pressure manifold 5 and a fitting 6 of a low pressure collector 7 are located. The collectors 5 and 7 are mounted on the sensor 8 type venturi. The relay case 2, inside which the membrane 9 is installed, is made in the form of a package of aneroids boxes, and a conduit 10 connecting the case of the relay 2 to the low pressure collector 7, mounted inside the housing 1. The high pressure P ,, taken from the sensor 8, enters collector 5, then through vtutser 4 into the casing t. A low pressure r flows through the manifold 7 and fitting 6 through conduit 10 into the inside of the relay 2. At this time, the working medium with pressure P will be the environment for the relay housing

2. The use of the invention provides increased accuracy of the differential pressure relay by eliminating temperature errors, which is especially important for its use in pneumatic systems of objects that are exposed to varying temperature of the medium surrounding the entire pneumatic system. Claims of the invention Pressure differential relays St. IP 513282, distinguished by the fact that, in order to compensate for temperature errors, it is equipped with a sealed casing with fittings for supplying high and low pressure, with the housing re-offset in the housing cavity, and its low pressure fitting is connected to the housing cavity in which the package is placed aneroid boxes. Sources of information taken into account in the examination 1. USSR author's certificate 513282, cl. G01 L 13/02, 31.12.74.