SU938044A1

SU938044A1 - Device for testing articles for fluid-tightness

Info

Publication number: SU938044A1
Application number: SU803211619A
Authority: SU
Inventors: Сергей Павлович Казанский; Анатолий Иванович Юрченко; Сергей Григорьевич Сажин; Евгений Васильевич Тараненко
Original assignee: Горьковский политехнический институт им.А.А.Жданова
Priority date: 1980-11-26
Filing date: 1980-11-26
Publication date: 1982-06-23

Description

Изобретение относится к испытательной технике, в частности к испытаниям на герметичность изделий.The invention relates to testing equipment, in particular to tests for the tightness of products.

Известно устройство для контроля герметичности изделий, содержащее камеру для контролируемого изделия, мембранный преобразователь, чувствительная мембрана которого взаимодействует с соплом, соединенным с измерительным пневмоблоком. Измерительный пневмоблок состоит из струйного элемента ИЛИ-НЕ-ИЛИ, один выход которого соединен с соплом мембранного преобразователя, а другой - с пневмоусилителем, нагрузкой которого является пневмолампа. При отсутствии утечки мембрана преобразователя не деформирована, струя с выхода HE-ИЛИ струйного элемента ИЛИ-НЕ-ИЛИ проходит че- эд рез сопло в атмосферу, на пневмоусилитель сигнал не поступает, и пневмолампа не горит. При наличии в изделии негерметичности повышается давление в камере и во входной полости мембранного преобразователя, мембрана де формируется, перекрывает сопло, увеличивается сопротивление истечению струи и она перебрасывается на канал ИЛИ. При этом на вход пневмоусилителя поступает сигнал и загорается пневмолампа, сигнализируя о наличии утечки £ll·A device for monitoring the tightness of products, containing a camera for a controlled product, a membrane transducer, a sensitive membrane which interacts with a nozzle connected to a measuring pneumatic unit. The measuring pneumatic unit consists of an OR-NOT-OR jet element, one output of which is connected to the nozzle of the membrane transducer, and the other - with an air amplifier, the load of which is a pneumatic lamp. In the absence of leakage, the converter membrane is not deformed, the jet passes through the nozzle into the atmosphere from the output of the HE-OR jet element OR-NOT-OR, the signal does not come to the pneumatic amplifier, and the pneumatic lamp does not burn. If there is a leak in the product, the pressure in the chamber and in the input cavity of the membrane transducer increases, the membrane deforms, blocks the nozzle, the resistance to the flow of the jet increases, and it is transferred to the OR channel. At the same time, a signal is received at the input of the pneumatic amplifier and the pneumatic lamp lights up, signaling the presence of a leak £ ll ·

Недостатком устройства является ограниченный диапазон контролируемых утечек вследствие ограниченного диапазона упругих деформаций чувствительного элемента преобразователя.The disadvantage of this device is the limited range of controlled leaks due to the limited range of elastic deformation of the sensor element of the Converter.

Наиболее близким к изобретению по технической сущности и достигаемо· му эффекту является устройство для испытания на герметичность изделий, содержащее камеру для размещения испытуемого изделия, измерительный пневмоблок, мембранный преобразователь, вход которого соединен с камерой и чувствительная мембрана которого взаимодействует с его соплом, соединенным с измерительным пневмоблоком, и узел защиты чувствительной мембраны [2].The closest to the invention in technical essence and the achieved effect is a device for testing the tightness of products, containing a chamber for accommodating the test product, a measuring pneumatic unit, a membrane transducer, the input of which is connected to the camera and the sensitive membrane of which interacts with its nozzle connected to the measuring pneumoblock, and a sensitive membrane protection unit [2].

Однако устройство имеет недостаточные диапазон контролируемых уте- 5 чек, чувствительность и надежность работы. Вследствие того, что узел защиты чувствительной мембраны не .способен защитить ее при медленном нарастании давления утечки, так как 10 в этом случае оно успевает передаться на чувствительную мембрану и вывести ее из строя. На скачкообразное изменение давления при больших дефектах дополнительная мембрана четко· <5 реагирует, перекрывая канал, сообщающий испытательную, камеру с полостью между мембранами, и отсекая полость перед чувствительной мембраной от испытательной камеры. При медлен- 20 ном же нарастании давления утечки оно успевает пройти в полость перед чувствительной мембраной и) создавая там большое давление, выводит мембрану из строя. 25However, the device has an insufficient range of controlled leaks, sensitivity and reliability. Due to the fact that the protection unit of the sensitive membrane is not able to protect it with a slow increase in leakage pressure, since 10 in this case it manages to transfer to the sensitive membrane and disable it. An additional membrane responds clearly to pressure jumps with large defects · <5 by blocking the channel communicating the test chamber with a cavity between the membranes, and cutting off the cavity in front of the sensitive membrane from the test chamber. With a slow increase in leakage pressure, it manages to pass into the cavity in front of the sensitive membrane and,) creating a lot of pressure there, puts the membrane out of order. 25

Кроме того, в известном устройстве уменьшается быстродействие контроля, так как создаются паразитные полости, а также потому, что утечка поступает в полость перед чувстви- 30 тельной мембраной через дополнительные каналы с малой пневмопроводимостью. Создание паразитных полостей уменьшает и чувствительность устройства, так как утечкой надо заполнять ₃₅и их.In addition, in the known device, the speed of control is reduced, since parasitic cavities are created, and also because the leak enters the cavity in front of the sensitive membrane through additional channels with low pneumoconductivity. The creation of spurious cavities also reduces the sensitivity of the device, since the leak must fill ₃₅ and them.

Цель изобретения - расширение диапазона величин контролируемых утечек и повышение чувствительности.The purpose of the invention is to expand the range of controlled leakage and increase sensitivity.

Указанная цель достигается тем, ⁴⁰'что в устройстве для испытания на герметичность изделий, содержащем камеру для размещения испытуемого изделия, измерительный пневмоблок, мембранный преобразователь, вход которо- ⁴⁵го соединен с камерой и чувствительная мембрана которого взаимодействует с его соплом, соединенным с измерительным пневмоблоком, и узел защиты чувствительной мембраны, узел ⁵⁰защиты выполнен в виде подпружиненного полого штока, сообщающего камеру с Входом преобразователя, и двух мембран, образующих между собой дополнительную камеру, а мембрана, об- ⁴⁵ращенная к входу преобразователя, имеет большую площадь взаимодействия по сравнению с другой мембраной.This goal is achieved by the fact that ⁴⁰ 'in the device for leak testing of products containing a chamber for accommodating the test product, a measuring pneumatic unit, a membrane transducer, the input of which is connected to the camera on the ^45th and whose sensitive membrane interacts with its nozzle connected to the measuring pneumatic unit , and the protection unit of the sensitive membrane, the protection unit ⁵⁰ is made in the form of a spring-loaded hollow rod that communicates the camera with the Converter Input, and two membranes, which form an additional chamber, and the membrane facing ⁴⁵ the inlet of the transducer has a larger interaction area compared to the other membrane.

На чертеже представлен вариант исполнения предлагаемого устройства.The drawing shows an embodiment of the proposed device.

Устройство содержит камеру 1 для размещения в ней изделия 2, сообщенную с мембранным преобразователем, состоящим из входной полости 3, чувствительной мембраны 4, защемленной по периметру в корпусе 5» взаимодействующего с мембраной 4 сопла 6, соединенного с измерительным пневмоблоком 7, узла защиты чувствительной мембраны, выполненного в виде подвижного полого штока 8, полость которого соединяется с входной полостью 3» дополнительной камеры 9, образованной мембранами 10 и 11, уплотненными по периметру в корпусе 5, и связанной через штуцер 12 с измерительным пневмоблоком 7» отжимной пружины 13, устанавливаемой концентрично штоку 8 в его нижней части.The device comprises a chamber 1 for accommodating an article 2 in it, in communication with a membrane transducer consisting of an input cavity 3, a sensitive membrane 4 clamped around the perimeter in the housing 5 ”nozzle 6 interacting with the membrane 4, connected to the measuring pneumoblock 7, a sensitive membrane protection unit made in the form of a movable hollow rod 8, the cavity of which is connected to the input cavity 3 "of the additional chamber 9, formed by membranes 10 and 11, sealed around the perimeter in the housing 5, and connected through the nozzle 12 to measure pneumatic block 7 "squeezing spring 13, mounted concentrically to the rod 8 in its lower part.

Входная полость 3 имеет каналы 14 для выхода воздуха из сопла в атмосферу, а в корпусе 5 выполнены каналы 15 для соединения с атмосферой входной полости 3 после отжима штока 8.The inlet cavity 3 has channels 14 for the exit of air from the nozzle into the atmosphere, and in the housing 5 channels 15 are made for connection with the atmosphere of the inlet cavity 3 after the rod 8 is pressed.

Измерительный пневмоблок 7 состоит из струйного элемента 16, струйного триггера 17 и пневмоусилителя 18, соединенного со штуцером 12. К триггеру 17 подключена пневмолампа 19.The measuring pneumatic unit 7 consists of an inkjet element 16, an inkjet trigger 17 and a pneumatic amplifier 18 connected to the nozzle 12. An air lamp 19 is connected to the trigger 17.

Устройство работает следующим образом.The device operates as follows.

В обычном состоянии, когда в испытательной камере 1 изделия 2 нет, и при отсутствии дефектов в изделии 2, чувствительная мембрана 4 не деформирована, , и струя воздуха струйного элемента 16 через сопло 6 и каналы 14 проходит в атмосферу, при этом пневмолампа 19 не горит, а давление с пневмоусилителя 18 поступает в дополнительную камеру 9. Так как со стороны дополнительной камеры 9 площадь взаимодействия мембраны 10 больше площади взаимодействия мембраны 11, то шток 8 из-за имеющей место разности усилий на них подтянут вверх, и между его торцом и чувствительной мембраной 4 образуется герметичная входная полость 3. Через определенное время выдержки испытательная камера 1 вскрывается и изделие 2 изымается из нее.In the normal state, when there is no product 2 in the test chamber 1, and if there are no defects in the product 2, the sensitive membrane 4 is not deformed, and the air stream of the jet element 16 passes through the nozzle 6 and channels 14 into the atmosphere, while the pneumatic lamp 19 does not burn , and the pressure from the pneumatic amplifier 18 enters the additional chamber 9. Since from the side of the additional chamber 9 the area of interaction of the membrane 10 is larger than the area of interaction of the membrane 11, the rod 8 is pulled upward due to the difference in the forces on them, and between its end face and Yelnia sealed diaphragm 4 formed inlet cavity 3. After a certain holding time test chamber 1 is opened and the article 2 is removed therefrom.

В случае испытания нетерметичного изделия 2 давление в полости камеры 1 , а соответственно, и во входной полости 3 мембранного преобразователяIn the case of testing an untight article 2, the pressure in the cavity of the chamber 1, and, accordingly, in the inlet cavity 3 of the membrane transducer

938044 6 увеличивается, чувствительная мембрана 4 деформируется в сторону сопла 6 и через некоторое время перекрывает его, струйный элемент 16 срабатывает, переключается триггер 17.и 5 включается пневмолампа 19» одновременно или с небольшой задержкой с выхода пневмоусилителя 18 снимается давление, пружина 13 отжимает шток 8 вниз, при этом входная полость 3 со- Ю единяется через каналы 15 с атмосферой.938044 6 increases, the sensitive membrane 4 deforms towards the nozzle 6 and blocks it after a while, the jet element 16 fires, the trigger 17 is switched on. And the pneumatic tube 19 is turned on simultaneously or with a slight delay, the pressure is released from the output of the pneumatic amplifier 18, spring 13 depresses the rod 8 down, while the inlet cavity 3 is connected through channels 15 with the atmosphere.

ιι

При отсутствии питания в измерительном пневмоблоке 7 в дополнительную камеру 9 давление не подается, шток 8 пружиной 13 отжат вниз (в сторону камеры 1) , при этом входная полость 3 сообщена с атмосферой.In the absence of power in the measuring pneumatic unit 7, pressure is not supplied to the additional chamber 9, the rod 8 is pressed down by a spring 13 (towards chamber 1), while the inlet cavity 3 is in communication with the atmosphere.

Таким образом, в предлагаемом _мустройстве обеспечивается в очень широком диапазоне утечек надежная защита чувствительной мембраны от повреждений и высокая работоспособность его с одновременным повышением чувст-₂₅вительности, быстродействия и производительности контроля. Узел защиты чувствительной мембраны превращен в .активный элемент конструкции устройства. --Thus, _m in the present apparatus is provided in a very wide range of leak reliable protection of the sensing diaphragm from damage and its high efficiency with simultaneous increase chuvst- pheno- _25, and the speed control performance. The sensitive membrane protection unit has been turned into an active structural element of the device. -

Claims

The invention relates to a testing technique, in particular to leak tests of products. A device for monitoring the tightness of products is known, which comprises a chamber for a controlled product, a membrane transducer whose sensitive membrane interacts with a nozzle connected to a measuring pneumatic unit. The measuring pneumo-block consists of an OR-NOT-OR jet element, one output of which is connected to the nozzle of a membrane converter, and the other to a power amplifier, the load of which is a pneumolamp. In the absence of leakage, the converter membrane is not deformed, the jet from the output of the NON-ISH of the jet element OR NON-OR passes through the nozzle into the atmosphere, the signal does not come to the pneumatic amplifier, and the pneumolamp does not burn. When the leakage in the product is leaking, the pressure in the chamber and in the inlet cavity of the membrane converter increases (the membrane is deformed), the nozzle closes, the resistance to jet flow increases, and it is transferred to the OR channel. At the same time, a signal is received at the input of the pneumatic amplifier and the pneumolamp is illuminated, indicating a leakage tl. The disadvantage of the device is a limited range of controlled leaks due to the limited range of elastic deformations of the transducer's sensing element. The closest to the invention in technical essence and the achieved effect is a device for testing the tightness of products, comprising a chamber for accommodating a test article, a measuring air block, a membrane transducer whose input is connected to the chamber and whose sensitive membrane interacts with its nozzle. connected to the measuring pneumatic unit, and the protection node of the sensitive membrane 2, However, the device has an insufficient range of controlled leaks, sensitivity and reliability of operation. Due to the fact that the protection node of the sensitive membrane is not capable of protecting it with a slow increase in leakage pressure, since in this case it manages to transfer to the sensitive membrane and take it out of order. The additional membrane responds to an abrupt change in pressure at large defects, closing the channel that informs the test chamber with the cavity between the membranes and the compartment before the sensitive membrane from the test chamber. With a slow increase in the pressure of leakage, it manages to pass into the cavity in front of the sensitive membrane and creating a lot of pressure there, removes the membrane. In addition, in the known device, the control speed is reduced, as parasitic cavities are created, and also because the leakage enters the cavity in front of the sensitive membrane through additional channels with low pneumatic conductivity. Creating parasitic cavities reduces the sensitivity of the device, since a leak must be filled. The purpose of the invention is to expand the range of controlled leakage and increase sensitivity. This goal is achieved by the fact that in a device for testing and tightness of products, comprising a chamber for accommodating a worker from a deli, a measuring pneumatic unit, a membrane converter, the input of which is connected to the chamber and a sensitive membrane which interacts with its nozzle connected to the measuring pneumatic unit and the assembly protection of the sensitive membrane, the protection assembly is made in the form of a spring-loaded hollow rod, which communicates the chamber with the converter's yoke, and two membranes, which form between The membrane facing the converter input has a large interaction area as compared to another membrane. The drawing shows a variant of the proposed device. The device comprises a chamber 1 for placing therein 2 a product connected with a membrane transducer consisting of an input cavity 3. a sensitive membrane t clamped along the perimeter in the housing 5. interacting with a membrane C of a nozzle 6 connected to a measuring pneumatic block 7, a sensitive protection unit a membrane made in the form of a movable hollow rod 8, the cavity of which is connected to the input cavity 3 of the additional chamber 9 formed by the membranes 10 and 11, sealed around the perimeter in the housing 5, and connected through a fitting 12 and Measuring pnevmoblokom 7, squeezing the spring 13, rod installed concentrically in its lower part. The entrance cavity 3 has channels 1 for air to escape from the nozzle into the atmosphere, and in case 5 channels 15 are made to connect with the atmosphere of the entrance cavity 3 after pressing the rod 8. The measuring pneumatic unit 7 consists of the jet element 16, the jet trigger 17 and the pneumatic amplifier 18 connected with fitting 12. To the trigger 17 is connected pnevmolamp 19. The device operates as follows. In the normal state, when there is no product 2 in the test chamber 1, and in the absence of defects in the product 2, the sensitive membrane is not deformed, and the jet of air of the jet element 16 passes through the nozzle 6 and channels 1 to the atmosphere, while the pneumatic breaker 19 is not lit and pressure c) amplifier 18 enters the additional chamber 9. Since, from the side of the additional chamber 9, the interaction area of the membrane 10 is larger than the interaction area of the membrane 11, the rod 8 is pulled upwards because of the difference between them and the end face and sensitive A second inlet membrane C forms an airtight entrance cavity 3. After a certain holding time, the test chamber 1 opens and the product 2 is withdrawn from it. In the case of an unpressurized product 2, the pressure in the cavity of chamber 1 and, accordingly, in the inlet cavity 3 of the membrane converter increases, the sensitive membrane on k is deformed in the direction of the nozzle 6 and closes it after some time, the jet element 16 triggers, and the trigger 17 switches. and the pneumatic breaker 19 is turned on simultaneously or with a slight delay from the exit of the pneumatic boost 18, the pressure is relieved, the spring 13 pushes the rod 8 down, while the input cavity 3 is connected through channels 15 to the atmosphere. In the absence of power in the measuring pneumatic unit 7, the additional chamber 9 is not supplied with pressure, the rod 8 is pushed down by a spring 13 to the side of the chamber 1, while the input cavity 3 is in communication with the atmosphere. Thus, in the proposed device, a very wide range of leaks is ensured, the sensitive membrane is reliably protected from damage and its working capacity is high with a simultaneous increase in sensitivity, speed and control performance. The protection node of the sensitive membrane has been turned into an active element in the construction of the device. Claims: A device for testing leaktightness of products, comprising a chamber for accommodating a test product, a measuring pneumatic unit, a membrane transducer (whose input is connected to the chamber and whose sensitive membrane interacts with its nozzle, connected to the measuring unit, pneumatic unit, and the sensitive membrane protection assembly, characterized in that, in order to expand the range of magnitudes of controlled leaks and increase the sensitivity of the device, the protection assembly is designed as a spring-loaded hollow stem (a camera with the converter input, and two membranes forming an additional chamber between them, and the membrane facing the converter input has a larger interaction area compared to another membrane.) Sources of information taken into account in the examination 1 USSR Copyright Certificate Vf 676887, cl. B 01 M 3/02, 1377. 2 about USSR Author's Certificate But application if 2710) 755 / 25-28, cl. G 01 M 3/02, 1979 (prototype).