CA2022688A1 - Cartridge for ejecting liquids under pressure - Google Patents
Cartridge for ejecting liquids under pressureInfo
- Publication number
- CA2022688A1 CA2022688A1 CA 2022688 CA2022688A CA2022688A1 CA 2022688 A1 CA2022688 A1 CA 2022688A1 CA 2022688 CA2022688 CA 2022688 CA 2022688 A CA2022688 A CA 2022688A CA 2022688 A1 CA2022688 A1 CA 2022688A1
- Authority
- CA
- Canada
- Prior art keywords
- driving body
- cartridge
- sealing element
- chamber
- liquid
- 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.)
- Abandoned
Links
Landscapes
- Portable Nailing Machines And Staplers (AREA)
Abstract
ABSTRACT
A new type of cartridge (1) to eject liquids that are under pressure incorporates a driving body (5) as a sabot (4), this being a hollow cylinder and configured with a rear opening that faces the propellant charge chamber (2). The foremost face end of the driving body (5) incorporates a spherical taper (10) with a cylindrical extension that accomodates a sealing element (6) by way of a force fit.
(Figure 1).
A new type of cartridge (1) to eject liquids that are under pressure incorporates a driving body (5) as a sabot (4), this being a hollow cylinder and configured with a rear opening that faces the propellant charge chamber (2). The foremost face end of the driving body (5) incorporates a spherical taper (10) with a cylindrical extension that accomodates a sealing element (6) by way of a force fit.
(Figure 1).
Description
g ~
-1- 26793-4~
The present invention relates to a cartridge for ejecting liquids under pressure, this incorporating a propellant charge chamber and a separating device, configured in the form of a driving sabot that is located between the propellant charge chamber and a liquid chamber, said sabot consisting of a driving body and a sealing element that is incorporated at one end.
Such a cartridge that is used to eject liquids under pressure is known from DE 37 26 490 C2. In this known cartridge/
the driving body is connected to the sealing element by means of a central pin so as to form a shape or force fit, the sealing element being configured either as a hollow body with an essentially spherical face end or being produced from plastic, preferably a polyurethane foam.
It is the object of the present invention to create a cartridge of the type described, in which the driving body has improved mechanical properties and which seals itself within the barrel of the apparatus.
Accordingly the present invention, comprises a cartridge for ejecting liquid under pressure, containing a separator in the form of a sabot that is arranged between a rear propellant charge chamber and a liquid chamber of the cartridge, said sabot consist-ing of a driving body and a sealing element that is fitted at the face end of the driving body, characterized in that the driving body is configured as a hollow cylindrical body of elastically deformable material that is open towards the rear propellant charge chamber and which incorporates a taper at the foremost face end 2 ~
starting from a cylindrical area and ending in one piece in a spherical or near spherical shape which accommodates the elastically deformable sealing element.
Within the conte~t of the present invention, the sealing element can be formed from a plastic, preferably from a,polyurethane foam.
In addition, the outer surface area of the driving body, together with the sealing element can form a li~uid chamber of enlargeable volume in the bore of the apparatus, this corresponding to an essentially radial inlet opening in the barrel of the apparatus. The driving body can be configured so as to be axially separable from the sealing element in the bore of the apparatus by the pressure of the liquid flowing into the liquid chamber.
The special shape of the driving body, as a hollow cylindrical body that is open at the rear towards the propellant charge chamber and is of an axially deformable material, has the advantage that when the powder propellant charge is ignited, the resulting gases generate a gas pressure within the driving body, which then forces the surface of the driving body tight against the inner wall of the barrel of the apparatus. Because of this particular shape, the driving body has two guide diameters. This makes it possible to shoot from barrels with diminishing inside diameters. The rear surface area that corresponds to the calibre guides the driving body within the cylindrical part of the barrel.
Within the adjacent part of the barrel, within which the inside ~3~ 26793-45 diameter grows continually smaller, the rear part of the driving body is compressed correspondingly. The foremost guiding diameter thereupon assumes the centering and guiding function in the narrower muzzle area of the barrel.
The end-face taper of the driving body that ends at the front in a one-piece spherical shape leads to improve mechanical properties of the driving body. The resulting gas pressure acts axially and optimally within the hollow cylindrcial driving body and compresses the column of water within the outer liquid chamber.
The foremost spherical taper ensures that the foremost sealing element releases properly from the spherical taper of the driving body under the resulting pressure of the liquid, and the driving body, itself sealed on its outer surface area because of existing internal gas pressure, forces the column of watex forward at a very high velocity, constantly and without damage to itself, adapting to the changing inside diameter of the barrel as it does this.
One embodiment of the present invention is shown in the drawings appended hereto. These drawings show the following:
Fig. 1: an embodiment of a sabot of the cartridge in cross section;
Fig. 2: a complete cartridge to eject liquid under pressure with the barrel of an apparatusl in cross section.
Within the cartridge 1 that is used to eject liquid, in particular water, under pressure, a sabot 4 is inserted as a ~2~
separator between a propellant charge chamber 2 and a liquid chamber 3.
The sabot 4 consists of a driving body 5 that is of plastic, for example a polyamide, and the sealing element 6 that is arranged axially at the head of the driving body 5 The driving body 5 of the sabot 4 is configured essentially as a hollow cylindrical body, in which the rearmost open face surface 7 is oriented towards the propellant charge chamber 2. Within this rear area, the outer surface incorporates a circular groove 8 for attachment to the cartridge case 13. In the front area, the driving body 5 is configured so as to have a face-end taper 9 that ends in one piece in a spherical or similar shape 10 with a cylindrical guide piece. The diameter of the guide piece corresponds to the reduced inside diameter of the barrel in the area of the muzzle (not shown herein). The sealing element 6 that is of polyurethane foam is installed on this spherical face sur~ace 10 .
In the rear area, with the casing, there are slots 11 distributed around the periphery, and these permit radial movement of the end surface. The surface 16 of the driving body 5 lies under slight tension against the inside surface 14 of the bore 15 of the apparatus.
As can-be seen in figure 2, the whole cartridge consists of the sabot 4 that is inserted into the cartridge casing 13.
Within the cartridge casing 13, at the rear end, there is a :' , .
2 ~
propellant charge chamber 2 with the necessary propellant charge 27.
The detonator 28 forms the end of the cartridge casing. A sealing element 6 is installed by force fit in the manner shown on the front face surface 17 of the sabot 4. The complete cartridge 1 is located in the chamber ~9 of the apparatus housing 30 with a breech (not shown herein). The barrel 24 is locked in the housing 30 in a manner not shown herein. A non-return val~e 31 is arranged in the essentially radial inlet opening 26 in the barrel 24, and this is connected to a hydraulic pump 32 by means of a pipe 33. A
further pipe 34 is located between the liquid reservoir 35 and the hydraulic pump 32.
Thus, the sabot 4 permits the separate feeding and loading of the drive components, namely the cartridge case 13 with the detonator 28, the propellant charge 27, the driving body 5, and the front sealing element 6, as well as the liquid that is to be ejected, for example water, from the container 35 to the liquid chamber 3.
The driving components are introduced into the chamber 29 of the barrel 24 from the breech or a corresponding feed system.
The chamber 29 is closed and locked at the rear by means of a breech (not shown herein). The quantity of liquid that is to be sealed in is pumped in through the non return valve 31 and through the inlet opening 26 of the barrel 24 by a hydraulic pump 32 into the annular chamber 3 between thc sealing element 6 and the driving body 5 of the sabot 4. Because of the pressure of the liquid the sealing element 6 separates axially from the driving body 5.
8 ~
-6- 2Z793-4~
Because of the liquid that flows in under pressure, the sealing element 6 within khe bore 15 is moved forward in the direction of the muzzle, as the outer friction is overcome. When this happens, the cylindrical portion 18 of the sealing element 6 lies under slight pressure against the inside surface 14 of the bore 15 so as to form a seal. Once the introduction of the liquid has been concluded, there is no longer any pressure available to move the sealing element 6. The sealing element 6 remains stationary and thus forms the foremost seal for the liquid within the barrel 24.
During the introduction of the liquid, the driving body 5 was held in place by the cartridge case 13 and thus forms the rearmost seal for the liquid.
Once this liquid has been successfully introduced, the cartridge is ready for firing. On detonation of the cartridge 1, gas pressure is generated within the internal space 19 of the driving body 5 and this acts radially against the inner wall 21 of the driving body as indicated by the arrows 20. This means that the driving body 5 of the sabot 4 is driven in the direction of the muzzle, and during this movement it forces the column of liquid in front of the sabot 4 against the sealing element 6 which is ejected from the barrel 24. At the same time, because of the gas pressure 20, the middle and rear portions of the driving body that can be extended radially and elastically lie against the inner wall 14 of the bore 14 so as to form a seal.
The ejections of the sabot 4 takes place at an extremely ~2~
high velocity, which is in the range of 1,000 m/sec. The water or liquid that has been introduced is thus driven like a projectile by the sabot 4 as a result of the pressure caused by the burning propellant charge 27. When a so-called water hammer of this sort is used in mining, this column of water with the foremost or front sealing element 6 is shot into drill holes in the rock. The rock within the drill hole is broken up because of the very high ejection pressure, which amounts to several -thousand bar.
-1- 26793-4~
The present invention relates to a cartridge for ejecting liquids under pressure, this incorporating a propellant charge chamber and a separating device, configured in the form of a driving sabot that is located between the propellant charge chamber and a liquid chamber, said sabot consisting of a driving body and a sealing element that is incorporated at one end.
Such a cartridge that is used to eject liquids under pressure is known from DE 37 26 490 C2. In this known cartridge/
the driving body is connected to the sealing element by means of a central pin so as to form a shape or force fit, the sealing element being configured either as a hollow body with an essentially spherical face end or being produced from plastic, preferably a polyurethane foam.
It is the object of the present invention to create a cartridge of the type described, in which the driving body has improved mechanical properties and which seals itself within the barrel of the apparatus.
Accordingly the present invention, comprises a cartridge for ejecting liquid under pressure, containing a separator in the form of a sabot that is arranged between a rear propellant charge chamber and a liquid chamber of the cartridge, said sabot consist-ing of a driving body and a sealing element that is fitted at the face end of the driving body, characterized in that the driving body is configured as a hollow cylindrical body of elastically deformable material that is open towards the rear propellant charge chamber and which incorporates a taper at the foremost face end 2 ~
starting from a cylindrical area and ending in one piece in a spherical or near spherical shape which accommodates the elastically deformable sealing element.
Within the conte~t of the present invention, the sealing element can be formed from a plastic, preferably from a,polyurethane foam.
In addition, the outer surface area of the driving body, together with the sealing element can form a li~uid chamber of enlargeable volume in the bore of the apparatus, this corresponding to an essentially radial inlet opening in the barrel of the apparatus. The driving body can be configured so as to be axially separable from the sealing element in the bore of the apparatus by the pressure of the liquid flowing into the liquid chamber.
The special shape of the driving body, as a hollow cylindrical body that is open at the rear towards the propellant charge chamber and is of an axially deformable material, has the advantage that when the powder propellant charge is ignited, the resulting gases generate a gas pressure within the driving body, which then forces the surface of the driving body tight against the inner wall of the barrel of the apparatus. Because of this particular shape, the driving body has two guide diameters. This makes it possible to shoot from barrels with diminishing inside diameters. The rear surface area that corresponds to the calibre guides the driving body within the cylindrical part of the barrel.
Within the adjacent part of the barrel, within which the inside ~3~ 26793-45 diameter grows continually smaller, the rear part of the driving body is compressed correspondingly. The foremost guiding diameter thereupon assumes the centering and guiding function in the narrower muzzle area of the barrel.
The end-face taper of the driving body that ends at the front in a one-piece spherical shape leads to improve mechanical properties of the driving body. The resulting gas pressure acts axially and optimally within the hollow cylindrcial driving body and compresses the column of water within the outer liquid chamber.
The foremost spherical taper ensures that the foremost sealing element releases properly from the spherical taper of the driving body under the resulting pressure of the liquid, and the driving body, itself sealed on its outer surface area because of existing internal gas pressure, forces the column of watex forward at a very high velocity, constantly and without damage to itself, adapting to the changing inside diameter of the barrel as it does this.
One embodiment of the present invention is shown in the drawings appended hereto. These drawings show the following:
Fig. 1: an embodiment of a sabot of the cartridge in cross section;
Fig. 2: a complete cartridge to eject liquid under pressure with the barrel of an apparatusl in cross section.
Within the cartridge 1 that is used to eject liquid, in particular water, under pressure, a sabot 4 is inserted as a ~2~
separator between a propellant charge chamber 2 and a liquid chamber 3.
The sabot 4 consists of a driving body 5 that is of plastic, for example a polyamide, and the sealing element 6 that is arranged axially at the head of the driving body 5 The driving body 5 of the sabot 4 is configured essentially as a hollow cylindrical body, in which the rearmost open face surface 7 is oriented towards the propellant charge chamber 2. Within this rear area, the outer surface incorporates a circular groove 8 for attachment to the cartridge case 13. In the front area, the driving body 5 is configured so as to have a face-end taper 9 that ends in one piece in a spherical or similar shape 10 with a cylindrical guide piece. The diameter of the guide piece corresponds to the reduced inside diameter of the barrel in the area of the muzzle (not shown herein). The sealing element 6 that is of polyurethane foam is installed on this spherical face sur~ace 10 .
In the rear area, with the casing, there are slots 11 distributed around the periphery, and these permit radial movement of the end surface. The surface 16 of the driving body 5 lies under slight tension against the inside surface 14 of the bore 15 of the apparatus.
As can-be seen in figure 2, the whole cartridge consists of the sabot 4 that is inserted into the cartridge casing 13.
Within the cartridge casing 13, at the rear end, there is a :' , .
2 ~
propellant charge chamber 2 with the necessary propellant charge 27.
The detonator 28 forms the end of the cartridge casing. A sealing element 6 is installed by force fit in the manner shown on the front face surface 17 of the sabot 4. The complete cartridge 1 is located in the chamber ~9 of the apparatus housing 30 with a breech (not shown herein). The barrel 24 is locked in the housing 30 in a manner not shown herein. A non-return val~e 31 is arranged in the essentially radial inlet opening 26 in the barrel 24, and this is connected to a hydraulic pump 32 by means of a pipe 33. A
further pipe 34 is located between the liquid reservoir 35 and the hydraulic pump 32.
Thus, the sabot 4 permits the separate feeding and loading of the drive components, namely the cartridge case 13 with the detonator 28, the propellant charge 27, the driving body 5, and the front sealing element 6, as well as the liquid that is to be ejected, for example water, from the container 35 to the liquid chamber 3.
The driving components are introduced into the chamber 29 of the barrel 24 from the breech or a corresponding feed system.
The chamber 29 is closed and locked at the rear by means of a breech (not shown herein). The quantity of liquid that is to be sealed in is pumped in through the non return valve 31 and through the inlet opening 26 of the barrel 24 by a hydraulic pump 32 into the annular chamber 3 between thc sealing element 6 and the driving body 5 of the sabot 4. Because of the pressure of the liquid the sealing element 6 separates axially from the driving body 5.
8 ~
-6- 2Z793-4~
Because of the liquid that flows in under pressure, the sealing element 6 within khe bore 15 is moved forward in the direction of the muzzle, as the outer friction is overcome. When this happens, the cylindrical portion 18 of the sealing element 6 lies under slight pressure against the inside surface 14 of the bore 15 so as to form a seal. Once the introduction of the liquid has been concluded, there is no longer any pressure available to move the sealing element 6. The sealing element 6 remains stationary and thus forms the foremost seal for the liquid within the barrel 24.
During the introduction of the liquid, the driving body 5 was held in place by the cartridge case 13 and thus forms the rearmost seal for the liquid.
Once this liquid has been successfully introduced, the cartridge is ready for firing. On detonation of the cartridge 1, gas pressure is generated within the internal space 19 of the driving body 5 and this acts radially against the inner wall 21 of the driving body as indicated by the arrows 20. This means that the driving body 5 of the sabot 4 is driven in the direction of the muzzle, and during this movement it forces the column of liquid in front of the sabot 4 against the sealing element 6 which is ejected from the barrel 24. At the same time, because of the gas pressure 20, the middle and rear portions of the driving body that can be extended radially and elastically lie against the inner wall 14 of the bore 14 so as to form a seal.
The ejections of the sabot 4 takes place at an extremely ~2~
high velocity, which is in the range of 1,000 m/sec. The water or liquid that has been introduced is thus driven like a projectile by the sabot 4 as a result of the pressure caused by the burning propellant charge 27. When a so-called water hammer of this sort is used in mining, this column of water with the foremost or front sealing element 6 is shot into drill holes in the rock. The rock within the drill hole is broken up because of the very high ejection pressure, which amounts to several -thousand bar.
Claims (6)
1. A cartridge for ejecting liquid under pressure, containing a separator in the form of a sabot that is arranged between a rear propellant charge chamber and a liquid chamber of this cartridge, said sabot consisting of a driving body and a sealing element that is fitted at the face end of the driving body, characterized in that the driving body is configured as a hollow cylindrical body of elastically deformable material that is open towards the rear propellant charge chamber and which incorporates a taper at the foremost face end starting from a cylindrical area and ending in one piece in a spherical or near spherical shape which accomodates the elastically deformable sealing element.
2. A cartridge according to claim 1, characterized in that the sealing element is formed from a plastic.
3. A cartridge according to claim 1 or 2, characterized in that the sealing element is formed from a polyurethane foam.
4. A cartridge according to claim ] or 2 characterized in that the outer surface of the driving body together with the seal-ing element forms a liquid chamber of enlargeable volume that corresponds to an essentially radial inlet opening in the barrel of a firing apparatus when the cartridge is in the chamber of the firing apparatus.
5. A cartridge according to claim 4, characterized in that the driving body can be axially separated from the sealing element within the bore of the barrel by the pressure of the liquid flowing into the liquid chamber (3).
6. A cartridge according to claim 1, 2 or 5, characterized in that the driving body incorporates axial slots in its rear area, said slots being distributed around the periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2022688 CA2022688A1 (en) | 1989-08-07 | 1990-08-03 | Cartridge for ejecting liquids under pressure |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3926051.8 | 1989-08-07 | ||
| CA 2022688 CA2022688A1 (en) | 1989-08-07 | 1990-08-03 | Cartridge for ejecting liquids under pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2022688A1 true CA2022688A1 (en) | 1991-02-08 |
Family
ID=4145649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2022688 Abandoned CA2022688A1 (en) | 1989-08-07 | 1990-08-03 | Cartridge for ejecting liquids under pressure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2022688A1 (en) |
-
1990
- 1990-08-03 CA CA 2022688 patent/CA2022688A1/en not_active Abandoned
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |