SU932318A1

SU932318A1 - Combined pressure receiver

Info

Publication number: SU932318A1
Application number: SU802981927A
Authority: SU
Inventors: Анатолий Дмитриевич Гегин; Михаил Иванович Хрекин; Игорь Оскарович Керстен
Original assignee: Всесоюзный Центральный Ордена "Знак Почета" Научно-Исследовательский Институт Охраны Труда; Филиал Центрального Аэро-Гидродинамического Института Им.Н.Е.Жуковского
Priority date: 1980-07-10
Filing date: 1980-07-10
Publication date: 1982-05-30

Description

(5) КОМБИНИРОВАННЫЙ ПРИЕМНИК ДАВЛЕНИЯ(5) COMBINED PRESSURE RECEIVER

II

Изобретение относитс к промышленной аэродинамике, в частности к измерительной аппаратуре, служащей дл определени скорости потока методом измерени динамического давлег ни .The invention relates to industrial aerodynamics, in particular, to measuring apparatus, which serves to determine the flow rate by a method of measuring dynamic pressure.

При испытани х вентил ционных систем , измерени динамического давлени осуществл ютс наибо1|ее часто с помощью трубки МИОТ 1. Данна трубка имеет следующие недостатки: бтсутствует кругова симметри при измерении динамического давлени ; трубка непригодна дл измерени в запыленных потоках, так как она неразборна и не может быть очищена в процессе эксплуатации.During tests of ventilation systems, dynamic pressure measurements are carried out most of the time by means of the MIOT tube 1. This tube has the following disadvantages: there is no circular symmetry in the measurement of the dynamic pressure; The tube is unsuitable for measurement in dusty streams, as it is not dismountable and cannot be cleaned during operation.

Дл запыленных потоков Иногда примен ют трубку Гинцветмета 2.For dusty streams, Gincolmett tube 2 is sometimes used.

Однако она имеет большие габариты (диаметр приемной части 18 мм). К тому же трубка сконструирована таким образом, что при измерени х продольна ось приемной части должна устанавливатьс перпендикул рно к направлению потока. Такое требование к расположению трубки приводит к заметному искажению набегающего потока, что влечет необходимость градуировки прибора при различных диаметрах мерного сечени . В св зи с указанными недостатками трубка Гинцветмета нашла весьма ограниченное применение.However, it has large dimensions (diameter of the receiving part is 18 mm). In addition, the tube is designed in such a way that, when measured, the longitudinal axis of the receiving part should be installed perpendicular to the direction of flow. This requirement for the location of the tube leads to a noticeable distortion of the incident flow, which makes it necessary to calibrate the device with different diameters of the measured cross section. Due to these disadvantages, the Gintsvetmet tube has found very limited application.

Наиболее близкими к предлагаемому вл ютс приемники давлени типа напорных трубок Прандтл , ЦАГИ и др., которые наиболее совершенны в части точности измерений СЗ.The closest to the proposed are pressure receivers of the type of Prandtl pressure pipes, TsAGI, etc., which are the most perfect in terms of the accuracy of the NW measurements.

Однако трубки Прандтл , ЦАГИ, так же как и трубка МИОТ, имеют ограниченный срок службы при эксплуатации в запыленных потоках, так как они конструктивно выполн ютс неразборными , что исключает возможность механической очистки приемной части трубки от засорений.However, Prandtl, TsAGI tubes, as well as the MIOT tube, have a limited service life when operating in dusty streams, since they are constructively non-separable, which eliminates the possibility of mechanical cleaning of the receiving part of the tube from blockages.

Claims

The purpose of the invention is to increase the service life during operation of the receiver in dusty streams by making it collapsible, which allows mechanical cleaning of the internal cavities of the receiver from clogging of the scientific research institute. This goal is achieved by connecting the full pressure receiver to the receiver in the inlet fitting, the total pressure is made in the form of an elastic hose placed inside a hollow thread connected to the full pressure receiver. Elastic sealing rings are inserted in the receiver, which create the necessary tightness. The drawing shows the constructs on the scheme of the proposed device. Static pressure receiver 2 is installed behind receiver 1 of full pressure. The end part of the full pressure receiver has a threaded connection with the holder 3, which compresses elastic seals k located at the junction points of the static pressure receiver with the full pressure receiver and the holder. The flexible hose 5 placed inside the holder serves as a communication channel for transferring full pressure to fitting 6, the transmission line of static pressure from receiver 2 to fitting 7 are: an annular cavity between the full pressure and static pressure receivers, the channels in the tail end of the full receiver pressure and the internal cavity of the holder. A cap nut 8 is screwed onto the tail end of the holder, which plays the role of the plug and presses the seal 9 between the holder and the outlet nipple. The device operates as follows. The cap nut is screwed, then the fitting is disconnected from the flexible hose and the full pressure receiver is unscrewed from the holder by thread, which ensures the connection of the FULL and static pressure receivers. In this case, rotation of the full pressure receiver relative to the holder is possible due to the fact that the full pressure line is made of an elastic hose that freely rotates inside the bent holder. The use of the proposed device, which has an increased service life, can lead to a reduction in the required number of combined pressure receivers, which will: reduce the cost of their manufacture; reduce the consumption of non-ferrous metals (copper, brass), of which, as a rule, devices of this type are manufactured. . Claims of Invention A combined pressure receiver containing full and static pressure receivers, a full holder with a static pressure fitting, inside which a full pressure receiver connection channel with a full pressure fitting is placed, characterized in that, in order to increase the receiver’s service life in dusty flows, in it the communication channel is made in the form of an elastic hose, and is connected to the receiver of full pressure by means of a thread., Sources of information taken into account during the examination 1.Instr. CRC for Testing and naadke ventilation devices. Minontazhspetsstroy USSR. TsBTI, M., 1968.

2. Gordon G.M. and others. Dust removal and gas cleaning. Metallurgists, 1968.

3. Gorlin S.M. et al. Airborne measurements. M., 1964, p. 221 (prototype).