SU561101A1 - Shock pipe - Google Patents

Description

one

The invention relates to the field of construction, in particular, to equipment designed to determine the density of building material of sedimentary and rocky rocks by acting on a material with a shock wave simulating a seismic effect.

A known shock tube designed to create a shock wave in an air medium, comprising a high pressure chamber, a piston with a locking device and a section channel filled with a working fluid l.

The disadvantage of -1 of such a shock tube is that it cannot be used to select the density of a fluid with a given velocity of propagation of a shock wave that initiates a seismic impact.

Closest to the invention known is a shock tube comprising a high pressure cylinder, a silencer, a piston with a stopper mechanism, and a sectional kangl connected to the silencer.

The disadvantage of this shock tube is that it is impossible to determine the velocity of propagation of the shock wave in the working fluid.

The aim of the invention is to determine the velocity of propagation of a shock wave in a liquid.

The goal is achieved by the fact that the shock tube is equipped with elements from a material with a low shock-wave transfer coefficient, installed between the channel sections and equipped with pressure sensors, the stopper mechanism is made with a piston drive mounted in the high-pressure cylinder body, and the silencer is made in the form of a cylinder, inside which a conical divider and a porous filter are mounted, installed with a gap between the walls of the cylinder, the muffler being connected to the sekinonny channel by means of an ilfon but

The predominant condition is

(making a porous filter from chromium wires, having a porosity of 35-40% when pressed, which makes the working fluid more evenly distributed.

5. In Fig. 1, a proposed shock tube is shown, a general view in Fig. 2, section A-A of Fig. 1 in Fig. 3 - permission BB fig.

Impact Pipe contains sectional

Claims (2)

0 channel 1 with sections 2, equipped with flanges 3, between which elements 4 are installed with a low shock-wave transmission coefficient, equipped with pressure sensors 5. The inner cavity of each section is lined with a layer b of sound-insulating composition — a secondary layer, which also has low adhesion. The pipe sections are connected, for example, by bolts 7 installed with insulating sleeves B, the lower part of coarse 1 is a high pressure cylinder in the form of a combustion chamber 9, inside which powder charge 10 is installed with an igniter 11 and a pyro cartridge 12 mounted in a pot 13, Above charge 10 in the shoulders 14, an adjustable piston 15 is located, consisting of a piston 16 directly with a flange 17 and an outer casing 18 with seals 19 and 20, which regulates: the length of the piston with a thread. The outer, part of the casing 18 and the pistons l & t & fluid to the liquid, are cut by means of rings 21 and 22 on the ring, which provides the possibility of obtaining a flat shock-wave front. The shock wave going in the liquid in the area of the inner forming tube is somewhat lagging behind the wave going in the center. In one of section 2, located close to the combustion chamber 9, there is a fitting 23 with a check valve 24, which serve to fill the pipe fluid. The combustion chamber is equipped with a pressure relief valve 25, which maintains the pressure it needs. To ensure the impact of the piston, its flange 17 has a bore 26 into which a pin enters. 27 stopper of piston 15 held by Spring 28. Through rod 27 there is a rocker arm 29, fixed by means of axis 30 on bracket 31. Under the impact of combustion gases, a piston 32, tightness of which is provided by a seal 33, presses on the copier 29. At the top of the shock tube is installed A silencer 34 connected to section 2 of channel 2 by means of a bellows 35. In addition, the channel section is equipped with stops 36 and 37, which interact with the bottom 38 of the housing of a silencer 39 in the form of a blind cylinder, inside which there is a gap A classic filter 40, made, for example, of nichrome wires by pressing with a porosity of 35-40%. At the end of the cylinder there is a conical divider 41, mounted on a rod 42, which is fixed by a nut 43 and passes through the bottom of the porous filter and rests against it with a flange 44. The spacer sleeve 45 provides a gap between the bottom of the cylinder 39 and the filter 40. When filling An internal air cushion 46 is created by the inner half of the shock tube by the working fluid, which improves the shock wave damping process. Shock tube works as follows. After filling the internal cavity of the shock tube with the working fluid, mounting the powder charge 10, igniter 11, sensor system 5 and adjusting the pressure relief valve 25, the pyro cartridge 12 is exploded. The gases formed in the combustion chamber 9 pressurize the piston 32, which reaching the required pressure through the yoke 29 pulls out the pin 27, squeezing the spring 28. The piston 15, freeing from holding the pin, sharply presses on the working fluid, as a result of which a shock wave with a flat front is formed, as the whiskers 21 and 22 hit the liquid simultaneously with the piston face. But due to the fact that fluid is braking near the pipe wall, the shock wave in channel 1 is compensated by pressure sensors 5, which send signals to a rectifier (not shown). Fluoroplastic elements 4 virtually eliminate the simultaneous movement of a shock wave through the metal. Having passed the entire channel, the shock wave enters the silencer 34 on the conical splitter 41, is reflected from it, moves further towards the metal filter 40, where it is also partially reflected, and partially damped, gradually damping, the pressure is raised by the shock wave in the silencer which is perceived by the air cushion and moves the muffler core through section 2, compressing the sylphs 35. Thus, the described shock tube allows measuring the density and strength of building elements in a wide range dynamic impact loads due to a change in the density of the working fluid and the possibility of determining the velocity of propagation of a shock wave in a fluid simulating a seismic effect, for example, on a building element or natural stones. Claim 1. Shock tube comprising a high pressure cylinder, a silencer, a piston with a stopper mechanism and a section channel connected to the silencer, so that in order to determine the velocity of propagation of a shock wave in a liquid , the shock drum of a ba is equipped with elements from a material with a low shock wave transmission coefficient, installed between the channel sections and equipped with pressure sensors, the stopper mechanism is made with a piston drive mounted in the high pressure cylinder body, and shitel configured as a cylinder, inside which are mounted the conical divider and the porous filter, yc tanovlenii with a gap between the cylinder wall, wherein the muffler is connected with the section channel with pomoschyu1silfona. J4 J JFig. 1 h fy che 5 vn w 10 № A .a FIG. 2 2. The impact pipe according to claim 1, in which the porous alloy is made of nichrome wires and has a porosity of 35-40%. Sources of information accepted in the examination: 1. The author's certificate of the USSR 200835, cl. G01 M 9/00, 1967. 2. Authors certificate of the USSR 329432, cl. GOl M 9/00, 1970. IS eleven