Full pressure receiver

IPC classes for russian patent Full pressure receiver (RU 2282198):

G01L19 - Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges

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Pressure indicator / 2247955
Housing (1) of the pressure indicator receives bellows (2) connected to core (6) provided with bushing (7) having solenoid (8) which forms inductive converter (9) with core (6). Housing (1) is provided with time relay (15) made of air vessel (16), sensitive member (18) with inductive pickup (19) made of winding (11) and additional core (20) spring-loaded by spring (26), adjustable throttle (22), and stop (25). Before operation, bellows (2) and object (4) are pressurized. In so doing, bellows (2) with bushing (7) moves upward and additional core (20) of pickup (19) enters winding (11), thus signaling of attainment of working pressure. Ring air chamber (13) is then pressurized. In so doing, solenoid (9) is secured to winding (11) interconnected through spacer (10). Relay (15) is pressurized simultaneously. When pressure in bellows (2) drops, core (6) begins to move, thus, generating a signal.

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Proposed media separator is used for measuring the pressure of aggressive, toxic, high-viscosity, solidifying (polymerizing) and contaminated media at pulsation of pressure or hydraulic impacts together with pressure gauges. Proposed separator has housing with cover, separating member mounted inside this housing and pressure fluctuation dampener made in form of through hole with thread over part of its length; it is provided with adjusting screw and thrust screw closing the hole on opposite side. Threaded hole is connected with hole of outlet pipe union and with cavity formed by separating member and cover.

Media separator / 2248545
Proposed media separator is used for aggressive, toxic, high-viscosity, solidifying and contaminated media at pulsations of pressure or hydraulic impacts and other media under question together with use of pressure gauges. Proposed separator has body with inlet pipe union, cover with outlet pipe union and separating member made in form of bellows and mounted in cavity of cover; hole of bellows is located opposite inlet hole of pipe union.

FIELD: measuring technique.

SUBSTANCE: receiver comprises receiving tube (1) whose inlet port face toward the flow and casing (2) connected with receiving tube (1) via porous wall (3). The space (4) defined between the tube and casing is ring-shaped in cross-section and is connected with a source of coolant, e.g. nitrogen, through pipeline (5). Receiving tube (1) receives pressure transducer (6) to define deceleration chamber (7) provided with needle nozzle (8).

EFFECT: enhanced precision.

3 cl, 1 dwg

The invention relates to the measurement of total pressure and can be used for measuring pressure and pressure pulsation in pulsating jets with detonation combustion.

Known air quality measurement receiver for measuring unsteady pressures within the gas flow [see patent RU No. 241764, IPC G 01 R 5/14, 18.04.1969], containing the receiving tube receiving and transmitting pressure fluctuations and the outer tube concentric relative to the reception at the end of which is equipped with a throttling sleeve with a radial through-holes located on the perimeter, and the annular gap of the receiving part of the tube is closed.

A disadvantage of the known technical solution is the presence of a resonant acoustic cavity between the inlet of the receiving tube and a pressure transducer, which significantly narrows the frequency range of the measured pressure pulsations.

The closest known technical solutions proposed device is a nozzle for measuring total pressure [see patent RU No. 1049813, IPC G 01 R 5/16, 23.10.1983], containing the receiving tube, the inlet of which is turned towards the stream, and a casing, which houses the reception tube and the cavity forming an annular cross-section, muted reception on the cut tube and communicated with a source of cooling medium, and a converted newstr the Chu stream end wall of the casing is made of a porous material.

A disadvantage of the known technical solution is that due to the inertia of pneumometric routes the device has a large error in the measurement of total pressure in fast processes.

The objective of the invention is to improve the accuracy of measurement of the total pressure in the high-temperature pulsed jets.

The technical result obtained by carrying out the invention, is to improve the accuracy of measurement of the total pressure in pulsed jets with detonation combustion.

This technical result is achieved in that in the receiver the total pressure, containing the receiving tube, the inlet of which is turned towards the stream, and a casing, which houses the reception tube and the cavity forming an annular cross-section, muted reception on the cut tube and communicated with a source of cooling medium directed towards the flow end wall of the casing is made of a porous material, in the receiving tube has a pressure transducer with education inside of a reception tube chamber deceleration of the flow, filled with needle nozzle, made of hollow pointed needle directed towards the flow, having a conical or ogival shape, and the porous wall of the casing it has a conical shape.

Diagram of the proposed receiver p is LEGO pressure shown on the drawing.

Receiver full pressure contains the receiving tube 1, the inlet of which is turned towards the stream, and the casing 2 connected porous end wall 3 with the receiving tube 1.

Formed between the annular cavity cross section 4 are connected by a pipe 5 with a source of cooling medium, for example nitrogen. Inside the receiving tube 1 has a pressure transducer 6 with the formation of the camera braking 7, filled with needle nozzle 8. The pressure transducer 6 is electrically connected to the signal Normalizer 9 and the Registrar of the output signal 10.

Receiver full pressure is as follows.

The receiver is introduced into the gas stream. In the chamber of the brake 7 of the receiving tube 1 facing the entrance towards the flow, the kinetic energy of the gas streams is converted to a pressure, which is measured fast-response pressure transducer 6, mounted directly in the chamber of the brake 7. If this is not distorted amplitude-frequency response of the entire measurement channel pressure and increases the measurement accuracy of the pressure pulsation. The cooling medium enters the receiver pressure pipe 5, provides active heat sink with pressure transducer 6 and through the porous wall 3 is forced into the stream.

In addition, the selected form igol the ATA nozzle 8 and the porous wall 3 reduces the intensity of the jump-rings, provides braking flow with less loss, which increases the coefficient of restitution of pressure and the accuracy of the measurement of the total pressure.

Studies of the calibration of receiver characteristics of total pressure in a shock tube have shown that in the frequency range up to 10 kHz receiver perceives pressure pulsations virtually no distortion.

The positive effect of this invention is to reduce the error of measurement of the total pressure and pressure pulsation in a high-speed gas flows and the increase in the information content of experimental studies of fast processes in pulsed jets with detonation combustion of fuel blends.

1. Receiver full pressure, containing the receiving tube, the inlet of which is turned towards the stream, and a casing, which houses the reception tube and the cavity forming an annular cross-section, muted reception on the cut tube and communicated with a source of cooling medium, and facing towards the flow end wall of the casing is made of a porous material, characterized in that the receiving tube has a pressure transducer with education inside of a reception tube chamber deceleration of the flow, filled with needle nozzle and the porous wall of the housing has a conical shape.

2. The receiver panagopoulou according to claim 1, characterized in that the needle-like nozzle is made of a hollow pointed needle directed towards the stream.

3. Receiver full pressure according to claim 2, characterized in that the needle nozzle has a conical or ogival shape.