GB2199867A - Hydraulic pulse generator - Google Patents
Hydraulic pulse generator Download PDFInfo
- Publication number
- GB2199867A GB2199867A GB08700902A GB8700902A GB2199867A GB 2199867 A GB2199867 A GB 2199867A GB 08700902 A GB08700902 A GB 08700902A GB 8700902 A GB8700902 A GB 8700902A GB 2199867 A GB2199867 A GB 2199867A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cavity
- piston
- sleeve
- communicating
- generator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012528 membrane Substances 0.000 claims abstract description 27
- 230000010355 oscillation Effects 0.000 claims abstract description 22
- 238000005192 partition Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000009471 action Effects 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C25/00—Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam
- E21C25/60—Slitting by jets of water or other liquid
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Catching Or Destruction (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
A hydraulic pulse generator comprises a hydropneumatic accumulator (1) communicating with an inlet pipe (2) of an oscillations generator (3) having a housing (4) accommodating a main piston (5) forming therein an after-seat cavity (6) and an after-piston cavity (7) communicating with a source (8) of continuous pressure, and a second hydropneumatic accumulator (9) having a membrane (10), a sub-membrane cavity (11) of which accommodates a piston (12) with a piston rod (13) cooperating with the main piston (5) and forming a rod-end cavity (14) separated from the after-piston cavity (7) by a partition wall (15) and communicating with the atmosphere, the sub-membrane cavity (11) communicating with an outlet pipe (19) through a by-pass pipe (17) having a flow restrictor (18). The after-seat cavity (6) of the housing (4) of the oscillations generator (3) accommodates a movable sleeve (21) containing the main piston (5) capable of movement inside the sleeve (21), the sleeve (21) defining inside the housing (4) a cavity (22) communicating with the outlet pipe (19). <IMAGE>
Description
HYDRAULIC PULSE GERATOR This invention relates to mining and hydraulic pulse machines associated with mining, and more particularly to hydraulic pulse generators.
The invention can find application in the mining industry and in waterworks engineering ror breaking rock by high-pressure pulsed water jets. It can also be used in power engineering for cleaning boiler installations of heat-electric generation plants.
There is known a hydraulic pulse generator com- prising a hydropneumatic accumulator provided on a delivery pipeline and connected by a pipe to an oscillations generator having a housing accommodating a hollow piston forming therein cambers for closing and opening pressure relief, and low and high pressure chambers, as well as a mechanism for controlling tbe movement of the hollow piston in the forum of an air cap separated by a membrane into two cavities. One of the cavities is filled with a compressed gas, whereas the other communicates the high pressure chamber through a variable rlow restrictor with the chamber for opening pressure relief and through a valve with the atmosphere.
The low pressure chamber is connected to a relief nozzle, whereas the high pressure chamber communicates with a working nozzle and with a pipe connecting the hydropneumatic accumulator to the oscillations generator.
Operation of this hydraulic pulse generator is based on accelerating the liquid in the pipe between the hydropneumatic accumulator and oscillations generator through the relief nozzle and subsequent stopping the flow of liquid before the working nozzle.
inherent in tais prior art hydraulic puLse generator is insufricient power and breaking capacity of the jet of liquid escaping from the working nozzle.
There is also known a hydraulic puLse generator comprising a hydropneumatic accumulator communicating with an inlet pipe of an oscillations generator having a housing accommodating a main piston forming therein an after-seat cavity and an aSter-piston cavity com municatinC with a source of continuous pressure, and a second hydropneumatic accumulator having a membrane a sub-membrane cavity of which accommodates a piston with a piston rod cooperating with the main piston and forming a rod-end cavity separated from the afterpiston cavity by a partition wall and communicating with the atmosphere, the sub-membrane cavity communicating with an outlet pipe and nozzle via a by-pass pipe having a flow restrictor.
Operation of this machine involves accumulating hydraulic energy to a predetermined magnitude to be followed by discharging the liquid through the working nozzle as a pulsed jet of high pressure and maximum flow rate.
However, a disadvantage of this machine is in sufficient breaking capacity of the liquid jet accounted for by delayed formation of the leading edge of the high pressure pulse resulting in that a gradual, rather than sudden, liquid pressure pulse is applied to the ract being worked. One explanation is that certain relationships between the structural parameters of the seat and nozzle (seat and main piston) may give rise to a state when an additional rorce acting on the main piston as a result of the action of pressure in the after-seat cavity exerted on part of the section of the main piston rails to adequately compensate for the accompanying rorces of friction.The main piston therefore tends to depart urom the seat too slowly to cause a delay in the formation of the leading edge of the nigh pressure pulse before the nozzle, and result in a slow rate of pressure growth and consequently less efricient hydraulicking. Also, the main piston can assume an intermediate position to result in a continuous rlow of liquid through the seat and nozzle and a faiLure of the hyuropneumatic accumulator wo be charged. This again makes operation of the bydraulic pulse generator inefficient.
It is an object of the present invention to increase the efficiency of hydraulicking through providing a steep leading edge of the high pressure pulse.
Another object is to accelerate the formation of the leading edge of the high pressure pulse to result in increased impact of the high pressure jet of water against an object to be broken.
One more object is to improve the reliability of the hydraulic pulse generator.
Yet another object is to provide a high pressure pulse of sufficierAt duration.
The aims of the invention are attained by that in a hydraulic pulse generator comprising hydropneumatic accumulator communicating with an inlet pipe of an oscillations generator having a housing accommodating a main piston forming therein an after-seat cavity communicating with a source of continuous pressure, and a second hydropneumatic accumulator having a membrane a sub-membrane cavity of which accommodates a piston with a piston rod cooperating with the main piston and forming a rod-end cavity separated from the afterpiston cavity of the nousing of the oscillations generator by a partition wall and communicating with the atmosphere, the sub-membrane cavity communicating through a by-pass pipe provided with a flow restrictor with an outlet pipe, according to the invention, the after-seat cavity of the housing of the oscillations generator accommodates a sleeve containing the main piston of oscillations generator capable of movement inside the sleeve, the sleeve defining in the housing a cavity communicating with the outlet pipe.
Preferably, the sleeve of the proposed hydraulic pulse generator comprises a stop for limiting the travel of the main piston.
Advisable, the after-piston cavity of the housing
of the oscillations generator comprises a stop for li
miting the travel of the sleeve.
In view of the aforedescribed, the sleeve engage
able with the seat functions as an additional locking
element ensuring a more reliable separation of the in
let pipe of the oscillations generator from the after
seat cavity during charging of the hydropneumatic accu
mulator. In addition, the sleeve divides of the after -seat cavity into two cavities of which one is the inner
cavity where the pressure equals the pressure in the
inlet pipe, when the main piston departs rrom the seat.
This ensures that the main piston is subject to the ma
ximum pressure difrerence, whereby the wain piston mov
es at a higher speed determined by the difference bet
ween the charging pressure in the inlet pipe and the
continuous pressure in the after-piston cavity. jl'he li
quid is admitted from the inlet pipe to the cavity com- municating with the outlet pipe only when the main pis
ton is thrust against the stop for limiting the travel
of the sleeve to force the sleeve from the seat. This
in turn ensures a sudden pressure growth in the outlet
pipe before the nozzle, that is a steep leading edge
of the high pressure pulse to result in more efficient
hydraulicking, prevent the main piston from sticking,
and thereby increase the efficiency and improve the re
liability of the hydraulic pulse generator.
Other advantages of the present invention will become more fully apparent from a detailed description of preferred embodiments tnereof with reference to the sole Figure of the accompanying drawings illustrating a general sectional view of the proposed hydraulic pulse generator.
With reference to the Figure of the drawings,the hydraulic pulse generator comprises a hydropneumatic accumulator 1 connected at one side to a delivery line or to a pump (not shown), and at the other side to an inlet pipe 2 of an oscillations generator 3. The oscillations generator 5 has a housing 4 accommodating a main piston 5 forming an after-seat cavity 6 and an afterpiston cavity 7 communicating with a source 8 of continuous pressure.In addition, the hydraulic pulse generator also comprises a second hydropneumatic accumulator 9 having a membrane 10; a sub-membrane cavity 11 of the membrane 10 accommodating a piston 12 with a rod 13 cooperation with the main piston 5 and define ing in the housing 4 a rod-end cavity 14 separated from the after-piston cavity 7 of the main piston 5 by a partition wall 15 and communicating with the atmosphere by way of a by-pass pipe L7 including a flow restrictor 18 with an outlet pipe 19 and a nozzle 20. Movably secured in the after-seat cavity 6 of the housing 4 or the oscillations generator 3 is a sleeve member 21.
This sleeve 21 accommodates the main piston 5 capable of movement therein, whereas the sleeve 21 per se defines in the housing 4 a cavity 22, which communicates with the outlet pipe 19 of the oscillations generator 3. The sleeve 21 has a stop 23 for limiting the travel of the main piston 5. The after-piston cavity / also accommodates a stop 24 for limiting the travel of the sleeve 21, whereas a seat 25 is formed by the inlet pipe 2 at the side of the main piston 5 and sleeve 21.
The hydropneumatic accumulator 1 comprises a membrane 26 which bears on a grid 27 under the action of com- pressed air; the membrane 10 of the second hydropneumatic accumulator 9 is also caused to bear on a grid 28 under the action of compressed air.
The hydraulic pulse generator operates in the following manner.
When a pressure is applied from the source 8 of continuous pressure to the after-piston cavity 7, the piston 12 and rod 13 thereof are moved in the sub-membrane cavity 11 toward the second hydropneumatic accumulator 9 to be brought out of engagement with the main piston 5. The same continuous pressure acts to move the sleeve 21 and main piston 5 toward the seat 25 to force them thereto. Closing of the seat 25 by the sleeve 21 and main piston 5 prevents the flow of water from the inlet ppe 2 of the oscillations generator 3 to the after-seat cavity 6 and cavity 22, and consequently therefrom to the outlet pipe 19 with the nozzle 20.Therefore, the water admitted from the pump or delivery line- tends to fill the interior of the inlet pipe 2 and hydropneumatic accumulator 1 and, while forcing the membrane 26 irom the grid 27, to. occupy tbe thus emptied space therebetween. The pressure of air above the membrane 26 and that of water thereunder tends to progressively increase.The hydropneumatic accumulator is thus charged, and the process of charging proceeds until the pressure in the inlet pipe 2 and in the hydropneumatic accumulator 1 grows to such a magnitude, when the force induced by its action on part of the surface area of the main piston 5 equal to the free area of the seat 25 overcomes the rorce produced by the action of continuous pressure in the atter-pis- ton cavity 7 on the entire surface area of the main piston 5. As soon as the force acting on the main piston 5 at the side of the inlet pipe 2 and figdropneu- matic accumulator L overcomes the force acting on the main piston 5 at the side of the after-piston cavity the the wain piston 5 is caused to depart from the seat 25.In consequence, the after-seat cavity 6 communicates with the inlet pipe 2, and the charging pressure starts to act on the entire surface area of the main piston 5. Therefore, the rorce acting on the main piston 5 at the side of the inlet pipe 2 grows instantly to accelerate the movement of the piston So The main piston 5 at the end of its travel engages with the stop 23 for limiting the movement of the sleeve 21 to detach the sleeve 21 rrom the seat 25 and communicate the inlet pipe 2 with the after-seat cavity 6 and cavity 22. The charging pressure acting on the surface area of the sleeve 21 tends to accelerate the main piston 5, and move the sleeve 21 and the main piston 5 to the stop 24 limiting the travel of piston 5 in the housing 4.
Detachment of the sleeve 21 from the seat 25 initiates the discharge phase of the hydropneumatic accumulator 1. A pulsed jet of water escapes from the nozzle 20 of the outlet pipe 19 to an object to be broken.
At the same time, the water rlows along the by-pass pipe 17 with the flow restrictor 18 to fill the submembrane cavity 11. The pressure in this cavity 11 is caused to grow instantly to a magnitude equal to the pressure of air in the hydropneumatic accumulator 9, whereupon the pressure growth slows down to depend on the rate of water flow passing through tbe rlow restrictor 18 and on the rate of compressing the air by the membrane 10. Because the surface area of the piston 12 exceeds the surface area of the rod 13 Dy several fold, and also because the rod end cavity 14 communicates with the atmosphere, the rirst signs of pressure in the sub-membrane cavity 11 cause the piston 12 with the rod 13 to move from the hydropneumatic accumulator 1 to engagement of the rod 19 with the main piston 5.
As the hydropneumatic accumulator 1 is discharged, the pressure in the inlet pipe 2 gradually drops, remaining invariable in the after-piston cavity 7,and progressively growing in the sub-membrane cavity 11 of the hydropneumatic accumulator 9. his results in an instant, when a force acting on the main piston 5 through the rod 13 from tbe sub-membrane cavity 11 overcomes the force acting on the main piston 9 at the side of the after-seat cavity 6 and ensuring tbe travel of the main piston 5 toward the seat 25. Therewith, the sleeve 21 remains forced to the stop 24, since the pressure exerted on its end face at the side of the after-seat cavity 6 is still greater than the continuous pressure in the after-piston cavity 7.As soon as the main piston 5 is forced to the seat 25, the pressure in the cavities 6 and 22 approaches the atmospheric, and the action of the continuous pressure in the afterpiston cavity 7 will cause the sleeve 21 to also move until it thrusts against the seat 25. This ends the process of discharging of the hydropneumatic accumulator 1 to be again followed by charging.
In the course of charging water is forced by compressed air of the hydropneumatic accumulator 9 from the sub-membrane cavity 11 along tbe by-pass pipe 17 with the rlow restrictor 18 to tbe outlet pipe 19, and therefrom to the atmosphere through the nozzle 20.
As soon as the membrane 10 is brought in contact with tbe grid 28, the pressure in the sub-membrane cavity 11 drops to the atmospheric, and the action of the continuous pressure in the after-piston cavity 7 will cause the piston 12 witn the rod 13 to move toward the hydropneumatic accumulator 9, whereas the rod 13 is brought out of enaement with the main piston 5, whereupon the operation cycle is repeated.
Claims (4)
1. A hydraulic pulse generator comprising a hy- dropneumatic accumulator communicating with an inlet pipe of an oscillations generator having a housing accommodating a main piston forming therein an after-seat cavity and an arter-piston cavity communicating with a source of continuous pressure, and a second hydropneumatic accumulator having a membrane a sub-membrane cavity of which accommodates a piston with a piston rod cooperating with the main piston and forming a rod-end cavity separated rrom tbe after-piston cavity of the housing of the oscillations generator by a partition wall, whereas the submembrane cavity communicates through a by-pass pipe having a flow restrictor with an outlet pipe, the after-seat cavity of the housing of the oscillations generator accommodating a movable sleeve containing the wain piston of the oscillations generator movably arranged inside the sleeve and design~ ing inside the no using a cavity communicating with the outlet pipe.
2. A hydraulic pulse generator as claimed in claim 1, in which the sleeve comprises a stop for limiting the travel of the main piston.
3. A hydraulic pulse generator as claimed in claim 2, in which the after-piston cavity of the housing of the oscillations generator accommodates a stop ror limiting the travel of the sleeve.
4. A hydraulic pulse generator substantially as described heretofore with reference to the accompanying drawings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8700902A GB2199867B (en) | 1987-01-16 | 1987-01-16 | Hydraulic pulse generator |
| DE19873702746 DE3702746C1 (en) | 1987-01-16 | 1987-01-30 | Hydropulsator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8700902A GB2199867B (en) | 1987-01-16 | 1987-01-16 | Hydraulic pulse generator |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8700902D0 GB8700902D0 (en) | 1987-02-18 |
| GB2199867A true GB2199867A (en) | 1988-07-20 |
| GB2199867B GB2199867B (en) | 1990-08-22 |
Family
ID=10610741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8700902A Expired - Fee Related GB2199867B (en) | 1987-01-16 | 1987-01-16 | Hydraulic pulse generator |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE3702746C1 (en) |
| GB (1) | GB2199867B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847326A (en) * | 2015-05-30 | 2015-08-19 | 重庆地质矿产研究院 | Blocking type hydraulic pulse generation device and method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1116161A1 (en) * | 1983-06-16 | 1984-09-30 | Государственный Союзный Завод По Механической И Химической Очистке Котлоагрегатов "Котлоочистка" | Hydraulic pulsation device |
-
1987
- 1987-01-16 GB GB8700902A patent/GB2199867B/en not_active Expired - Fee Related
- 1987-01-30 DE DE19873702746 patent/DE3702746C1/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847326A (en) * | 2015-05-30 | 2015-08-19 | 重庆地质矿产研究院 | Blocking type hydraulic pulse generation device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2199867B (en) | 1990-08-22 |
| DE3702746C1 (en) | 1988-07-28 |
| GB8700902D0 (en) | 1987-02-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1209463A (en) | Accelerating slugs of liquid | |
| KR101118941B1 (en) | Impact device and method for generating stress pulse therein | |
| GB2199867A (en) | Hydraulic pulse generator | |
| US4619593A (en) | Apparatus comprising a turbine and associated water extractor and method of translating the potential energy of deep sea water into useful work | |
| US4660379A (en) | Airtrap power generator | |
| CN112160949B (en) | Explosion-proof high-efficiency hydraulic pile hammer control system and pile driving method thereof | |
| CN2381825Y (en) | Pressure energy accumulator | |
| SU1116161A1 (en) | Hydraulic pulsation device | |
| US3433014A (en) | Device for the production of energy in bursts | |
| RU2707989C1 (en) | Compressor unit | |
| GB2198168A (en) | Hydraulic pulse generator | |
| CN210423185U (en) | Boosting cylinder | |
| CN110963191A (en) | Air cannon | |
| GB2194810A (en) | Hydraulic pulse generator | |
| CN1010601B (en) | Hydraulic pulse generator | |
| SU1384758A1 (en) | Hydraulic accumulating pulser | |
| GB2198167A (en) | Hydraulic pulse generator | |
| JPS63197791A (en) | Fluid pulse generator | |
| SU1231959A1 (en) | Hydraulic pulser | |
| RU6579U1 (en) | BREAKER | |
| JPS63167891A (en) | Hydraulic pressure pulsation generator | |
| SU1534217A1 (en) | Hydroaccumulator | |
| KR20000038513A (en) | Device and method for extracting gravity energy using water hammer pressure | |
| KR890005279B1 (en) | Accelerating slugs of liguid | |
| RU1804554C (en) | Percussion tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |