CA1271687A - Double-barrel pulse-generating hydraulic monitor - Google Patents

Abstract

DOUBLE-BARREL PULSE-GENERATING HYDRAULIC MONITOR
Abstract A double-barrel pulse-generating hydraulic monitor comprises a housing accommodating pistons interconnected by a rod, and a partition arranged coaxially with the housing, defining between the pistons third and fourth cavities, and having an axial through hole connected to a delivery pipe. The partition is provided with chambers of which one communicates with the third cavity and with an adjacent outlet pipe, the other chamber communicating with the fourth cavity and with an outlet pipe adjacent to this other chamber. The outlet pipes are connected to nozzled barrels, and communicate by way of pipes with the first and second cavities.

Description

DOUBI~-~ARRE~ PULSE-GENERA~IN~
HYD~AU~IC MONI'TOR

This invention relates to hydraulicking, and more p~rticularly to double-barrel pulse-generating hgdrau lic monitors.
~ he invention can find application in mining and hydraulic engineering for breaking rock and materials by pulsed jets of watel without increasin~ the pressure in the pulse. It can also be used in power engineering for cleanin~ thermal elements of` boiler installations.
'I'here is known a double-barrel pulse-~enerati~g hydraullc ~onitor (cf., e.g., U~SR Inventor's Certi-vicate No. 962,611, Int. Cl.3 E 21 C 25/60, published 1982) co~prising a housin~ accommodating an interrup ter o~ a liguid flow in the form o~ two pistons ar-ran~ed coaxially with the housing and interconnected by a rod to be capable of axial movement, first and se-cond nozzled barrels, first and second outlet pipes each connected to the corresponding nozzled barrel, a ~elivery pipe, fiIst and second pipes, ~irst and second air chambers commu~icating with first and second cavities formed between the pistons~ walls of the housi~g and the first and second air chambers and co~ec~-ed by way of the first and second pipes to the first and second outlet pipes, respectively, and a pipeline with a valYe to communicate thç first or second caYity with the atmosphere.

~27~ i87

- 2 Arran~ed coaxially inside the h~ing are two seats. A space between the seats and Walls of the hous-ing is communicating with the delivery pipe, ~hereas the pistons are disposed in spaces defined between the seats, walls of the housing9 and first and second air chambers. Mounted on the housing are pivots having cham-bers. Some of these chambers communicate with the first and second outlet pipes and with the spaces defined by the seats, walls of the housing, and first and second air cha~bers, whereas other cha~bers communicate with the first and second cavi~ies, and connected by way of the first and second pipes to the first and second outlet pipes, respectively.
The provision ot' the space confined between the seats and walls of the housing, as well as spaces bet-ween the seats, walls o~ the housing and pistons calls for substantial size and consequently mass of the ~low interrupter, which gives rise to forces of inertia dur-ing its movement, slows the speed of travel of the flow interrupter, reduces the f~requency of pulsation of the pressure of liguid ~n the no7zled barrels, and therefore results in les's eff'icient operation of the ~; hydraulic monitor.
.t.iB an object of the present invention to reduce the size and mass of the liquid flow interrup-ter.
Another object is to reduce the forces of ire~tia , .

accompanying the travel of the flow interrupter.
Another object is to increase the speed of move-ment of the flow interrupter.
- One more object is to ensure a higher freguency of pulsations of the pressure of liguid in the outlet pipes, and in the nozzled barrels.
The final object is to ma~e hydraulicking more ef-ficient.
'rhese and other objects of the invention are at-tained ~y that in a double-barrel pul9e-generating hyd-raulic monitor comprising a housin~ accommodatin~ an inter-rupter o~ a licluid flow in the form of pistons arranged coaxially with the housing and i~terconnected bg a rod for axial displacement, first and second nozzled barrels, ~irst and sec~ond outlet plpes each connected to the correspondin~ nozzled barrel, a delivery pipe, fixst and second pipes, first and second alr chambers communicating with fixst and second cavities de~ined between the pistons, walls of the housing, and first and second air chambers and connected by way of the ; first and second pipes to the first and second outlet pipes~ respectively, the first or se~ond cavity com-municating through a valve with the atmosphere, ac-cording to the in~ention, the hydraulic monitor includ-es a partition having a through hole and arranged co-axially in the housin~ between the pistons to form ~ ..i ~

:~L687 third and four~h cavities, the through hole communicat-in~ with the delivery pipe connected to the partition, the body of the partition having ~i:rst and second cham~
'bers with inlets arranged at the opposite ends o~ the partition with parts thereo~ formin~ seats~ and com-mun.icating With the third and ~ourth cavities, whereas outlets of the ~irst and second chambers communicate ~ respectively, with the first arld second outlet pipesS con-nected to the partition.
'~he aforede~cri'bed arran~e~nent o~ the double-bar-rel pulse-~e~erating hydraulic monitor ensures increas-ed e~iciency of hydraulicking, a~d provldes higher operation reliability due to reducing the dynamic loads, viz., thanks to reducing the mass o~` the flow inter-rupter.
The invention will now be described in greater detail with reference to the specific embodiments the-~ reof taken in conjunction with the accompanying drawin~s, i~'which:
~ ig. 1 is a ~eneral view of the proposed double-barrel pulse-generating hydraulic monitor; and Fig 2 is a section taken along the line II-II
in Fig. I.
The proposed double-barrel pulse-generating hyd-raulic monitor comprises a housing 1 (Fig. 1) accom-modating an int~rrupter 2 of a flow o~ liquid (in this .

~27 687 case water) in the ~orm of pistons 3 and 4 interconnect-ed by a rod 5, outlet pipes 6 and 7 connected to nozzl ed barrels 8 and 9, and a delivery pipe 10 (Fig~. 2).
Cavities 11 (Fig. 1) and 12 are de~ined between the pistons 3 and 4, walls of` the housing 1, and air cham-bers 13 ~nd 14 to communicate accordingly both with these air chambers 13 and 14, and through pipes 15 and 16 with the outlet pipes 7 and 6, The air chambers 13 and 14 are occupied by a compressed gas. The interior o~ the hcusing 1 is provided with a partition 17 hav-ing a throu~h axial hole 1~ and disposed between the pistons 3 and 4 coaxially with the housing i, i.e., the longitudinal centerline 19 of` the partition 17 runs in line witn the axis 20 o~ the housin~ e cutlet pipes 6 and 7 and the delivery pipe 10 (Fig. 2) are connected to the partition 17~ The body of the partiti-on 17 (Fig . 1) has chambers 21 and 22. Inlets 23 and 24 of` these chambers 21 and 22 are arran~ed at opposite ends 25 and 26 o~ the partition 17, whereas outlets 27 and 28 thereof communicate with the outlet pipes 7 and 6.
PartS of the ends 25 and 26 of the partition 17 form seats 29 and 30. The partition 17 is interposed between the pistons 3, 4 to define cavities 31, 32. mese ca-vities 31 9 32 are def i ne d by the wal 1 s of t he ho usi ng 1 t ends 25, 26 o~ the partitio~ 17, and pistons 3 and 4, respectivel~. The inlets ~3, 24 o~ the cha~bers 21, 22 com~unicate with the cavities 31, 32. In addition, the ~:7~7 cavities 11 and 12 communicate with the air chambers 13 and 14 through membranes 33 and 34 bearing on grids 35 and 36. One of these cavities, such as cavity 11, com-municates via a pipe 37 and a valve 37' with the atmosphere.
The nozzled barrels 8, 9 have pi~ots 38 and 39~ the housin~ 1 per se being mourlted on a frgme 40 (Fig. 2).
~11 the connections are pressure-sealed by sealing rings 41 (Fig. 1). Elements 42 are used to secure the air cha~-bers 13, 14 on the housing 1.
The dou~le-barrel pul~e-~enerating hydraulic moni-tor accordin~ to the invention operates in t~e Pollowing manner.
When the valve 37' is open, while the pistons 3 and 4 WitLl the rod 5 of the flow interrupter rest in the .
extreme position at the seat 30, the outlet pipe 6 with the barrel 8 is cut of~, and the access of water is open to the outlet pipe 7 with the nozzled barrel 9.
'~riater delivered by the pipe 10 (Fig. 2) fills the in-terior of the through axial hole 18, ~lows through the space bet~een the seat 29 (Fig. 1) and piston 3, enters the cavity 31 and travels further through the inlet Z3 at the side of the end 25 of the partition 17 to enter the chamber ~1 to ~low through the outlet 27 of the chamber 21 to the outlet pipe 7 and ~urther through the pivot 39 to the nozzled barrel 9 to escape therefrom outside to ward the object to be broken. I~ addition, ~ ~ ~ 6 water ~lows ~rom the outlet pipe 7 along the pipe 15 to fill the cavity 11; however, since the valve 37' is open7 t~e pressure in this cavity is close to the at-mospheric. ~'he same pressure is maintained in the ca-~vity 12, because the outlet pipe 6 with the pivot 3~
and nozzled barrel 8 are discommunicated from the de-livery pipe line 10 (~ig. 2) b~ virtue of the seat 30 being closed by the piston 4 (~ig. 1). As a result, the membranes 33 and 34 are caused to be ~orced by the pres-sure o~ ~as in the air chambers 13 and 14 to the grids 35 and 36.
In order to initiate self-oscillations, the valve 37 is closed. ~he pressure of water in the cavity 11 gra-dually grows until the membrana 33, while departin~
from the grid 35 under the pressure of water, assumes a position, where the pressure exerted o~ both sides the-reo~ equalizes. After this, the pressure i~ the cavity lI
momentarily grows to the pressure in the outlet pipe 7.
~ force thereby arises actin~ to move the pistons 3 and 4 with the rod 5 o~ the ~low i~terrupter 2 to bea~ on the seat 29. Water rushes from the interior of the through axial hole 18 via the space between the seat 30 and piston 4 through the cavity 32, chamber 22, outpet pipe 6 and pivot 38 to the nozzled barrel 8 to escape there~rom toward the object to be broken. At the same time water flows from the outlet pipe 6 along the . , . ., . ~ . ~

~6~7 pipe 16 to occupy the cavity 12~ ~he pressure in this chamber 12 gradually grows until the ~embrane 34, while departing froul the grid 36, assumes a position, where the pressure at both sides thereof becomes equal. The-reaf'ter, the pressure in -~he cavity 12 grows spasmodi-call~ to the pressure in the outlet pipe 6. Si~ulta-neously, wateI escapes from the cavity 11 along the pipe 15 to the outle~ pipe 7 and nozzled barrel 9, whereas the pressure in the cavity 11 gradually dIvps until the l~embrane 33, being forced by the action o~
the co~pressed gas, is brought in contact with the grid 35.
'lhis i5 followed by a s~asmodic reduc~ion of pIessure to the pres~ure i~ the outlet pipe 7 with the no~zled barrel ~, ~iz., to the atLnospheric. Subsequent to ter-mination of pressure redestribution in the cavities 11 and 12 the pistons 3 and 4 with the rod 5 are caused to move toward the seat 30. ~he sequences taking place in the outlet ~ipes 6 and 7 with the nozzled barrels 8 and ~ therefore alternate and proceed substantially as described heretofore. In consequence, water escapes alternately fro~i the nozzled baIrels toward the object to be broken. The steady flow of` water deli~ered to the monitor is thus trans~oImed to a pulsing flow with the fre(~uency of pulses about 15 20 cps.
In vlew of the foregoing, the use of the parti-tion 17 having the through hGle 18 and disposed coa-~ially inside thehousing 1 between the pistons 3, 4, ~2~1~37 and the provision of chambers 21, 22 inlets 23, 24 of which are arran~ed at the opposite ends of the partl-tion 17, as well as the co!ilmunication of the through axial hole 18 with the delivery pipe 10, and the out-lets 27, 28 o~` the challbers 21, 22 with the outlet lines 7, 6, ensures a reduction in the path o~ tra~el o water from the delivery li~e 10 to the nozzled bar-rels ~ and 8. In turn, this provided the following advanta$es:
reduced width of the housi~g of the m~nitor from 610 to 400 mll~, i.e., by a ~'actor of 1.53;
reduced width o~ the liq~id f'low interrupter fro~i, ~ùO to 2~0 ~ni~ i.e. ? by a factor of 1.53;
reduced weight of the flow interrupter fro~ 2Q kg to 13 kg, i.e., by a factor of 1.53, thanks to the s~ialler dimensions;
increased speed of travel of the flow interupter fro~ 5 ~/s to 5.5 ~s, iOe., by 1.1 times, thanks to the reduction of its mass;
a reduction in the amount of' dynamic loads exerted on the housing and seats by a factor of 1~25 thanks to the aforedescribed reduction i~ the mass of the interrupter by a ~actor of 1.53 and increase in ~he travel speed of the flow interrupter by 1.1 times; and an increase in the frequency of water pressure pul-sations in the nozzled barrels from 10-12.5 cps to 15-20 cps, that is by 1,5 ti~eR, to result in a higher efficie~cy hydraulic brea~

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A double-barrel pulse-generating hydraulic moti-tor for breaking an object by a pulsating flow of li-quid comprising:
a housing ; a longitudinal axis of said housing;
walls of said housing;
an interrupter of a flow of liquid; first and second pistons of said interrupter of the flow of liquid; a rod of said interrupter of the flow of li-quid; said first and second pistons being interconnected to be capable of axial displacement;
first and second nozzles;
first barrel with said first nozzle;
second barrel with said second nozzle;
first outlet pipe connected to said first nozzled barrel;
second outlet pipe connected to said second nozzl-ed barrel;
a delivery pipe;
a first air chamber;
a second air chamber;
a first cavity defined between said first piston, said wall of the housing and said first air chamber, and communicating through a valve with the atmosphere;
a second cavity defined between said second piston, said wall of the housing and said second air chamber;

said first air chamber connected to said first cavity;
said second air chamber connected to said second cavity;
first and second pipes;
said first cavity communicating by way of said first pipe with said first outlet pipe;
said second cavity communicating by way of said second pipe with said second outlet pipe;
third and fourth cavities;
a partition; a body of said partition; a through axial hole in said partition; first and second ends of said partition;
part of said first end;
said part of said first end having the form of a first seat;
part of said second end;
said part of said second end having the form of a second seat;
a longitudinal axis of said partition coinciding with said longitudinal axis of said housing, said delivery pipe and said first and second out-let pipes connected to said partition;
said partition secured in said housing between said first and second pistons to form said third and fourth cavities;

first and second chambers provided in said body of said partition; inlet and outlet of each said first and second chambers;
said inlet of said first chamber arranged at said first end of said partition and communicating with said third cavity;
said inlet of said second chamber arranged at said second end of said partition and communicating with said fourth cavity;
said outlet of said first chamber communicating with said first outlet pipe;
said outlet of said second chamber communicating with said second outlet pipe.