CA2216951A1 - Device for sealing a lance into an aperture through which the lance can be introduced into a pressurized vessel - Google Patents
Device for sealing a lance into an aperture through which the lance can be introduced into a pressurized vessel Download PDFInfo
- Publication number
- CA2216951A1 CA2216951A1 CA002216951A CA2216951A CA2216951A1 CA 2216951 A1 CA2216951 A1 CA 2216951A1 CA 002216951 A CA002216951 A CA 002216951A CA 2216951 A CA2216951 A CA 2216951A CA 2216951 A1 CA2216951 A1 CA 2216951A1
- Authority
- CA
- Canada
- Prior art keywords
- lance
- sealing device
- packing
- inner casing
- sealing
- 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
- 238000007789 sealing Methods 0.000 title claims abstract description 79
- 238000012856 packing Methods 0.000 claims abstract description 80
- 239000000463 material Substances 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000011796 hollow space material Substances 0.000 description 7
- 230000002829 reductive effect Effects 0.000 description 7
- 208000035388 Ring chromosome 22 syndrome Diseases 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000000284 resting effect Effects 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0073—Seals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/46—Sealings with packing ring expanded or pressed into place by fluid pressure, e.g. inflatable packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
Abstract
A device for sealing a lance (12) in an opening in a container under pressure, in particular a shaft furnace, is described. The device comprises a first casing (46) with an end wall on the shaft furnace side and on the environment side, which are each provided axially with an opening for a lance (12), and a sealing element (14), which is arranged in the first casing (46). The sealing element (14) comprises at least one packing (50) and at least one axially movable annular piston (52), which are arranged coaxially with an axis (24) of the device, the packing (50) being arranged between the piston (52) and one of the end walls of the first casing (46) in the actuating direction of the piston (52). The packing (50) is pressed axially against one of the end walls of the casing (46) by actuation of the piston (52), the packing (50) extending radially and being laidaround the lance (12) to form a seal.
Description
CA 022169~1 1997-09-30 (~
P-PWU-31 ~/WO
Device for sealing a lance in an opening for introduction of the lance into a container under pressure This invention relates to a device for sealing a lance in an opening for introduction of the lance into a container under pressure, in particular a shaftfurnace.
To enable measurement of the gas concentrations in a shaft furnace it is 5 already known how to introduce a lance with a measuring probe through a lateral hole into the shaft furnace. As an overpressure prevails inside the furnace, this hole must be sealed against the lance to prevent outflow of the gases in part injurious to health.
Sealing devices, which enable introduction and withdrawal of the lance and at 10 the same time prevent outflow of the gases from the shaft furnace, are provided for this purpose.
Plastically deformable packings, which are arranged in a tight casing and rest tightly against the lance to be introduced with the result that a seal against the casing is achieved, are the simplest form of sealing device. However, the cross-15 section of the lance is subject to relatively marked fluctuations. These changesin the lance cross-section may result on the one hand from deposits or wear, with the result that the cross-section is increased or reduced, while on the other hand operating temperature fluctuations and the associated thermal expansion or contraction cause changes in the lance cross-section. However, the effect of 20 these changes is that the plastic packings no longer rest tightly against thelance relatively quickly with the result that the sealing property is lost.
DE-A-29 50 672 discloses a sealing device having an elastic tubular seal, which can be pressed down, joined to the seal and resting on the lance. This elastic seal is subjected to pressure when the lance is introduced with the result that it 25 fits even more tightly around the lance and thus increases the tightness. As the tubular seal rests continuously against the lance the stressing of the material by friction when the lance is introduced and withdrawn is considerable, which leads CA 022169~1 1997-09-30
P-PWU-31 ~/WO
Device for sealing a lance in an opening for introduction of the lance into a container under pressure This invention relates to a device for sealing a lance in an opening for introduction of the lance into a container under pressure, in particular a shaftfurnace.
To enable measurement of the gas concentrations in a shaft furnace it is 5 already known how to introduce a lance with a measuring probe through a lateral hole into the shaft furnace. As an overpressure prevails inside the furnace, this hole must be sealed against the lance to prevent outflow of the gases in part injurious to health.
Sealing devices, which enable introduction and withdrawal of the lance and at 10 the same time prevent outflow of the gases from the shaft furnace, are provided for this purpose.
Plastically deformable packings, which are arranged in a tight casing and rest tightly against the lance to be introduced with the result that a seal against the casing is achieved, are the simplest form of sealing device. However, the cross-15 section of the lance is subject to relatively marked fluctuations. These changesin the lance cross-section may result on the one hand from deposits or wear, with the result that the cross-section is increased or reduced, while on the other hand operating temperature fluctuations and the associated thermal expansion or contraction cause changes in the lance cross-section. However, the effect of 20 these changes is that the plastic packings no longer rest tightly against thelance relatively quickly with the result that the sealing property is lost.
DE-A-29 50 672 discloses a sealing device having an elastic tubular seal, which can be pressed down, joined to the seal and resting on the lance. This elastic seal is subjected to pressure when the lance is introduced with the result that it 25 fits even more tightly around the lance and thus increases the tightness. As the tubular seal rests continuously against the lance the stressing of the material by friction when the lance is introduced and withdrawn is considerable, which leads CA 022169~1 1997-09-30
2 P-PWU-3 1 7/WO
to rapid wear and destruction of the tubular seal and the associated loss of sealing function.
As the elasticity of the seal must be ensured, the wear cannot be prevented even by reinforcing or coating the friction surface. In other words it is not 5 possible to increase the wall thickness at will, as is customary with plastic seals, or coat the friction surface with a wear-resistant material, because this generally does not have a high elasticity.
To avoid this disadvantage of the attached elastic seal the patent specificationDE-A-44 15 219 and DE-A-44 1~ 221 disclose a sealing device, which 10 comprises an elastic inflatable seal, which is pressurised so that it fits tightly against the lance when the latter has already been introduced, but is retracted so far during insertion and withdrawal of the lance that it no longer rests against the latter. To ensure the tightness during introduction or withdrawal of the lance, however, several annular seals, e.g. flexible seals or packings, which rest continuously against the lance, are provided. Whereas the disadvantage of rapid wear of the elastic material s eliminated in this sealing device, a new problem arises. As the inflatable, elastic seal no longer rests against the lance when the latter is moved, it is no longer possible to compensate in this phase for radial play caused by the changes in the lance cross-section.
Furthermore, various sealing devices, which can be used to seal shafts or journals in a casing, have been described. FR-A-1.600.190 describes, for example, a sealing device for a journal with inflatable seal, which rests tightly against the journal when pressurised. The inflatable seal is arranged in a ring in a radial chamber in a casing, the ring being movable radially in the latter in such a way that radial displacements between the journal and the casing can be compensated. However, this device again has the disadvantage of the rapidly wearing tubular seal already described above.
DE-A-14 25 523 discloses a sealing device for rotating shafts, in which two flexible packings are arranged around the shaft inside a casing, the packings being held in their axial position by an open cage construction under spring tension or by a shell made from an easily deformable material. The flexible CA 022169~1 1997-09-30
to rapid wear and destruction of the tubular seal and the associated loss of sealing function.
As the elasticity of the seal must be ensured, the wear cannot be prevented even by reinforcing or coating the friction surface. In other words it is not 5 possible to increase the wall thickness at will, as is customary with plastic seals, or coat the friction surface with a wear-resistant material, because this generally does not have a high elasticity.
To avoid this disadvantage of the attached elastic seal the patent specificationDE-A-44 15 219 and DE-A-44 1~ 221 disclose a sealing device, which 10 comprises an elastic inflatable seal, which is pressurised so that it fits tightly against the lance when the latter has already been introduced, but is retracted so far during insertion and withdrawal of the lance that it no longer rests against the latter. To ensure the tightness during introduction or withdrawal of the lance, however, several annular seals, e.g. flexible seals or packings, which rest continuously against the lance, are provided. Whereas the disadvantage of rapid wear of the elastic material s eliminated in this sealing device, a new problem arises. As the inflatable, elastic seal no longer rests against the lance when the latter is moved, it is no longer possible to compensate in this phase for radial play caused by the changes in the lance cross-section.
Furthermore, various sealing devices, which can be used to seal shafts or journals in a casing, have been described. FR-A-1.600.190 describes, for example, a sealing device for a journal with inflatable seal, which rests tightly against the journal when pressurised. The inflatable seal is arranged in a ring in a radial chamber in a casing, the ring being movable radially in the latter in such a way that radial displacements between the journal and the casing can be compensated. However, this device again has the disadvantage of the rapidly wearing tubular seal already described above.
DE-A-14 25 523 discloses a sealing device for rotating shafts, in which two flexible packings are arranged around the shaft inside a casing, the packings being held in their axial position by an open cage construction under spring tension or by a shell made from an easily deformable material. The flexible CA 022169~1 1997-09-30
3 P-P~U-317/WO
packings are forced in a radial direction against the sealing face of the shaft by admission of a pressure medium to the casing and the contact pressure on the shaft is increased. US-A-2,273,129 describes a seal for an anti-friction bearing, in which two sealing rings with a U-shaped cross-section rest against the shaft 5 in a casing coaxial with a shaft, the legs of the U section each forming a sealing lip. The seals are axially spaced in such a way that the recesses in the U-shaped cross-sections are axially opposite each other, so that the recesses terminate in a pressure space formed between the seals. Admission of a pressure medium to the pressure space forces the two sealing lips of each seal 10 radially apart, so that the sealing lip resting on the shaft fits more closely to the latter. US-A-3,434,728 describes a device for sealing a shaft bushing into a pressure space with a casing integrated with the latter, the casing extending coaxially with the shaft outside the pressure space. Packings, which are each pressed by a sleeve-type piston against the corresponding end face of the 15 casing, are arranged around the shaft at each end face of the casing inside the latter. However, these devices are not suitable to compensate for radial displacements between a lance and the axis of a bushing.
Consequently the present invention is based on the task of providing a device for sealing a lance on entry into a container under pressure, which can 20 compensate both for radial play as a result of changes in the lance cross-section and also displacements of the lance axis with regard to the bushing axiswithout jeopardising the tightness of the device due to excessively rapid wear.
According to the invention this problem is solved by a device for sealing a lance in an opening for leading the lance into a container under pressure, in particular 25 a shaft furnace, which comprises an outer casing with an end wall on the shaft furnace side and on the environment side, which are provided axially with an opening for a lance, and a sealing element arranged in the outer casing, and which is characterised by the fact that the sealing element comprises an inner casing with axial end walls provided with an opening for the lance as well as at30 least one packing and at least one axially movable annular piston, which are arranged inside the inner casing coaxially with an axis of the inner casing, that the packing is arranged between the piston and one of the end walls of the CA 022169~1 1997-09-30
packings are forced in a radial direction against the sealing face of the shaft by admission of a pressure medium to the casing and the contact pressure on the shaft is increased. US-A-2,273,129 describes a seal for an anti-friction bearing, in which two sealing rings with a U-shaped cross-section rest against the shaft 5 in a casing coaxial with a shaft, the legs of the U section each forming a sealing lip. The seals are axially spaced in such a way that the recesses in the U-shaped cross-sections are axially opposite each other, so that the recesses terminate in a pressure space formed between the seals. Admission of a pressure medium to the pressure space forces the two sealing lips of each seal 10 radially apart, so that the sealing lip resting on the shaft fits more closely to the latter. US-A-3,434,728 describes a device for sealing a shaft bushing into a pressure space with a casing integrated with the latter, the casing extending coaxially with the shaft outside the pressure space. Packings, which are each pressed by a sleeve-type piston against the corresponding end face of the 15 casing, are arranged around the shaft at each end face of the casing inside the latter. However, these devices are not suitable to compensate for radial displacements between a lance and the axis of a bushing.
Consequently the present invention is based on the task of providing a device for sealing a lance on entry into a container under pressure, which can 20 compensate both for radial play as a result of changes in the lance cross-section and also displacements of the lance axis with regard to the bushing axiswithout jeopardising the tightness of the device due to excessively rapid wear.
According to the invention this problem is solved by a device for sealing a lance in an opening for leading the lance into a container under pressure, in particular 25 a shaft furnace, which comprises an outer casing with an end wall on the shaft furnace side and on the environment side, which are provided axially with an opening for a lance, and a sealing element arranged in the outer casing, and which is characterised by the fact that the sealing element comprises an inner casing with axial end walls provided with an opening for the lance as well as at30 least one packing and at least one axially movable annular piston, which are arranged inside the inner casing coaxially with an axis of the inner casing, that the packing is arranged between the piston and one of the end walls of the CA 022169~1 1997-09-30
4 P-PWU-31 7/wO
inner casing in the actuating direction of the piston, that the packing can be compressed axially against one of the end walls of the inner casing by actuationof the piston whereby the packing extends radially and forms a seal around a lance which is being led through, and that the inner casing is radially movable in
inner casing in the actuating direction of the piston, that the packing can be compressed axially against one of the end walls of the inner casing by actuationof the piston whereby the packing extends radially and forms a seal around a lance which is being led through, and that the inner casing is radially movable in
5 the outer casing, so that the inner casing together with the packing and the piston is self-centering on a lance led into a container.
The negative effects of the wear on the seal arrangement can be significantly reduced by using a packing, i.e. a plastic seal, as sealing element. In reality the problem of maintaining their elasticity is not encountered with plastic seals.
10 Hence with this packing the material thickness can be increased and the friction surface coated with a wear-resistant material without any adverse effect on the sealing properties.
It should be noted that the term packing is used as a generic term here. It is obvious to the expert that a packing as used in the present invention may also 15 consist or several packing rings arranged axially next to each other. In this case the individual packing rings are pressed against each other on actuation of the piston, a first packing ring being supported by one of the end walls, whereas a second packing ring rests directly against the piston and transfers the piston pressure to the interposed packing rings.
20 As the packing can be compressed by a piston, a feature of the device according to the invention is that the seal can be adapted to variations in the lance cross-section. In addition the actuation of the piston can be discontinuedfor movement of the lance in the device. Consequently the tight fit of the packing around the lance is loosened and the latter can be moved with less 25 frictional resistance.
Furthermore, according to the internal pressure in the container, the tightness of the entire device can be adapted to the conditions in the container by stronger or weaker actuation of the piston. In other words the required greater tightnessof the sealing devices, e.g. in the case of a pressure increase in the container, 30 can be achieved by stronger actuation of the piston.
CA 022169~1 1997-09-30 The possibility of radial displacement of the inner casing in the second casing enables it to adapt to an inclined or axially displaced position of the lance in the sealing device. Hence the inner casing can be freely centered on the lance, if the latter is introduced at an angle or with axial displacement into the sealing5 device.
In a preferred embodiment the sealing element comprises two pistons and two packings, which are arranged coaxially with the axis of the device, the two pistons being arranged axially between the two packings, so that they act in opposite directions when actuated and each of the packings can be 10 compressed by a piston against one of the end walls of the inner casing.
The stress on the individual packing can be reduced by the use of several packings. In addition an adequate sealing effect of the device is achieved with a weaker actuation of the pistons.
To facilitate the introduction and withdrawal of the lance and to reduce the wear 15 on the seals it is advantageous to install an elastic element within the at least one packing, concentrically with the axis of the device, which is enclosed by the packing and at least partially reverses the axial deformation of the packing when the piston is not actuated.
On reduction of the piston pressure on the packing the elastic element 20 endeavours to reassume its original shape. If the piston is no longer actuated, the potential energy stored in the elastic element during compression of the packing by the pistons is released and the packing is extended axially. This is associated with a radial contraction with the result that the close fit of the packing around the lance is loosened.
25 To ensure the tightness of the entire device the inner casing is advantageously sealed against the end walls of the outer casing with annular flexible seals which are attached to the end walls of the inner casing.
An embodiment in which two pistons are arranged in such a way that an annular pressure chamber is formed between the two pistons, is particularly 30 advantageous. If each of the pistons is sealed with an inner annular seal radially inwards against a guide sleeve, which is mounted coaxially with the axis, and CA 022169~1 1997-09-30
The negative effects of the wear on the seal arrangement can be significantly reduced by using a packing, i.e. a plastic seal, as sealing element. In reality the problem of maintaining their elasticity is not encountered with plastic seals.
10 Hence with this packing the material thickness can be increased and the friction surface coated with a wear-resistant material without any adverse effect on the sealing properties.
It should be noted that the term packing is used as a generic term here. It is obvious to the expert that a packing as used in the present invention may also 15 consist or several packing rings arranged axially next to each other. In this case the individual packing rings are pressed against each other on actuation of the piston, a first packing ring being supported by one of the end walls, whereas a second packing ring rests directly against the piston and transfers the piston pressure to the interposed packing rings.
20 As the packing can be compressed by a piston, a feature of the device according to the invention is that the seal can be adapted to variations in the lance cross-section. In addition the actuation of the piston can be discontinuedfor movement of the lance in the device. Consequently the tight fit of the packing around the lance is loosened and the latter can be moved with less 25 frictional resistance.
Furthermore, according to the internal pressure in the container, the tightness of the entire device can be adapted to the conditions in the container by stronger or weaker actuation of the piston. In other words the required greater tightnessof the sealing devices, e.g. in the case of a pressure increase in the container, 30 can be achieved by stronger actuation of the piston.
CA 022169~1 1997-09-30 The possibility of radial displacement of the inner casing in the second casing enables it to adapt to an inclined or axially displaced position of the lance in the sealing device. Hence the inner casing can be freely centered on the lance, if the latter is introduced at an angle or with axial displacement into the sealing5 device.
In a preferred embodiment the sealing element comprises two pistons and two packings, which are arranged coaxially with the axis of the device, the two pistons being arranged axially between the two packings, so that they act in opposite directions when actuated and each of the packings can be 10 compressed by a piston against one of the end walls of the inner casing.
The stress on the individual packing can be reduced by the use of several packings. In addition an adequate sealing effect of the device is achieved with a weaker actuation of the pistons.
To facilitate the introduction and withdrawal of the lance and to reduce the wear 15 on the seals it is advantageous to install an elastic element within the at least one packing, concentrically with the axis of the device, which is enclosed by the packing and at least partially reverses the axial deformation of the packing when the piston is not actuated.
On reduction of the piston pressure on the packing the elastic element 20 endeavours to reassume its original shape. If the piston is no longer actuated, the potential energy stored in the elastic element during compression of the packing by the pistons is released and the packing is extended axially. This is associated with a radial contraction with the result that the close fit of the packing around the lance is loosened.
25 To ensure the tightness of the entire device the inner casing is advantageously sealed against the end walls of the outer casing with annular flexible seals which are attached to the end walls of the inner casing.
An embodiment in which two pistons are arranged in such a way that an annular pressure chamber is formed between the two pistons, is particularly 30 advantageous. If each of the pistons is sealed with an inner annular seal radially inwards against a guide sleeve, which is mounted coaxially with the axis, and CA 022169~1 1997-09-30
6 P-PWU-31 7/WO
with an outer annular seal radially outwards against the inner surface of the inner casing, the annular pressure chamber is sealed axially and the two pistons can be actuated simultaneously by admission of a pressure medium to the pressure chamber.
5 This saves separate feed lines for the pressure medium to the two pistons as well as expensive control of the pressurisation.
., In a further embodiment an elastic seal, which seals the pressure chamber ' outwards, is arranged in the pressure chamber.
In this embodiment the annular seals, with which each of the pistons is sealed 10 radially inwards against the guide sleeve and radially outwards against the inner surface of the first casing, can be dispensed with.
To ensure a certain continuous pre-tension of the packings and thus a certain tightness, elastic means, which can actuate the pistons, can optionally be arranged between the pistons in the pressure chamber. These elastic means 15 may comprise, for example, a spiral spring. This spring presses the pistons against the packings with a certain force even if the pressure chamber is not under pressure. It should be noted that the spring force of the spring should besmaller than the spring force of the elastic means in the packings, because otherwise the deformation of the packing cannot be reversed (even partially).
20 In a further variant of the embodiment radially movable, wedge-shaped elements, which can actuate the pistons, are arranged between the pistons.
These wedge-shaped elements can then be moved radially inwards, e.g. by admission of a pressure medium to a chamber between the first and second caslng.
25 Elastic means, e.g. a pretensioned spiral spring ring or a pretensioned ring made from elastic plastic, which exerts a force directed radially inwards on thewedge-shaped elements, can also optionally be arranged around the latter.
Elastic means, which rest radially inwards on the guide sleeve and press radially outwards against the wedge-shaped elements, can be arranged CA 022169~1 1997-09-30
with an outer annular seal radially outwards against the inner surface of the inner casing, the annular pressure chamber is sealed axially and the two pistons can be actuated simultaneously by admission of a pressure medium to the pressure chamber.
5 This saves separate feed lines for the pressure medium to the two pistons as well as expensive control of the pressurisation.
., In a further embodiment an elastic seal, which seals the pressure chamber ' outwards, is arranged in the pressure chamber.
In this embodiment the annular seals, with which each of the pistons is sealed 10 radially inwards against the guide sleeve and radially outwards against the inner surface of the first casing, can be dispensed with.
To ensure a certain continuous pre-tension of the packings and thus a certain tightness, elastic means, which can actuate the pistons, can optionally be arranged between the pistons in the pressure chamber. These elastic means 15 may comprise, for example, a spiral spring. This spring presses the pistons against the packings with a certain force even if the pressure chamber is not under pressure. It should be noted that the spring force of the spring should besmaller than the spring force of the elastic means in the packings, because otherwise the deformation of the packing cannot be reversed (even partially).
20 In a further variant of the embodiment radially movable, wedge-shaped elements, which can actuate the pistons, are arranged between the pistons.
These wedge-shaped elements can then be moved radially inwards, e.g. by admission of a pressure medium to a chamber between the first and second caslng.
25 Elastic means, e.g. a pretensioned spiral spring ring or a pretensioned ring made from elastic plastic, which exerts a force directed radially inwards on thewedge-shaped elements, can also optionally be arranged around the latter.
Elastic means, which rest radially inwards on the guide sleeve and press radially outwards against the wedge-shaped elements, can be arranged CA 022169~1 1997-09-30
7 P-PWU-3 1 7/~0 between the guide sleeve and wedge-shaped elements as restoring element for the latter.
It is advantageous for all embodiment variants to coat the supporting surfaces, with which the inner casing rests on the lance, with a material, which reduces 5 the frictional resistance of the supporting surfaces on the lance.
Consequently the wear on these parts is, of course, reduced, thereby substantially prolonging the life of the sealing device.
Various embodiments of the device according to the invention are described below with reference to the figures.
10 Fig. 1 shows a section through the axis of a first embodiment of a device for sealing a lance, Fig. 2 the central part of the device according to Fig. 1 in an enlarged section, Fig. 3 - Fig. 7 sections through the central parts of different sealing devices, Fig. 8 a cross-section along the iine A-A' at right angles to the axis through the 1 5 sealing device in Fig . 1 .
Fig. 1 shows a section through an embodiment of a sealing device. It comprises an outer casing 2, which is divided in its interior into several chambers 4-8, which are separated by ribs 10 in the axial direction and in which the individual sealing elements are arranged. The casing 2 and ribs 10 are provided with an 20 opening for a lance 12 axially in the centre, the width of the opening being dimensioned in such a way that the lance 12 has a relatively large radial play in the opening.
The device in Fig. 1 comprises a further two sealing elements 16, 18 in chambers 4 and 8, in addition to a central sealing element 14, which is mounted 25 in the central chamber 6. These may be of the type described in DE-A-44 15 219 and DE-A-44 15 221. They comprise rings 20, 22, the inside cross-section of which is adapted to the cross-section of the lance 12. Each of these rings 20 or 22 is mounted in such a way in its chamber 4 or 8 that it can be moved at right angles to the central axis 24 of the sealing device. This 30 possibility of moving the rings 20, 22 in their respective chamber 4, 8 of the
It is advantageous for all embodiment variants to coat the supporting surfaces, with which the inner casing rests on the lance, with a material, which reduces 5 the frictional resistance of the supporting surfaces on the lance.
Consequently the wear on these parts is, of course, reduced, thereby substantially prolonging the life of the sealing device.
Various embodiments of the device according to the invention are described below with reference to the figures.
10 Fig. 1 shows a section through the axis of a first embodiment of a device for sealing a lance, Fig. 2 the central part of the device according to Fig. 1 in an enlarged section, Fig. 3 - Fig. 7 sections through the central parts of different sealing devices, Fig. 8 a cross-section along the iine A-A' at right angles to the axis through the 1 5 sealing device in Fig . 1 .
Fig. 1 shows a section through an embodiment of a sealing device. It comprises an outer casing 2, which is divided in its interior into several chambers 4-8, which are separated by ribs 10 in the axial direction and in which the individual sealing elements are arranged. The casing 2 and ribs 10 are provided with an 20 opening for a lance 12 axially in the centre, the width of the opening being dimensioned in such a way that the lance 12 has a relatively large radial play in the opening.
The device in Fig. 1 comprises a further two sealing elements 16, 18 in chambers 4 and 8, in addition to a central sealing element 14, which is mounted 25 in the central chamber 6. These may be of the type described in DE-A-44 15 219 and DE-A-44 15 221. They comprise rings 20, 22, the inside cross-section of which is adapted to the cross-section of the lance 12. Each of these rings 20 or 22 is mounted in such a way in its chamber 4 or 8 that it can be moved at right angles to the central axis 24 of the sealing device. This 30 possibility of moving the rings 20, 22 in their respective chamber 4, 8 of the
8 P-PWU-31 7/WO
casing 2 enables the rings 20, 22 to be adapted to an inclined or axially displaced position of the lance 12 in the sealing device. Hence the rings with the sealing elements can centre freely on the lance 12, if the lance is introduced through the sealing device at an angle or axially displaced.
5 The rings 20, 22 constitute holders for packings or seals, which rest on the lance 12. For example, the ring 20 is provided on the inside with a packing consisting of two packing rings 26, via which it rests on the lance 12. The ring22 has an inflatable seal 30, which is accommodated in a hollow space 32 in ring 22. In the uninflated position this inflatable seal 30 is retracted into its 10 hollow space 32; this enables the lance 12 to move without damage or wear to the inflatable seal 30. In the inflated position, the inflatable seal 30 can, however, compensate for substantially larger radial play than the two packing rings 26 of the sealing element 16. The ring 22 advantageously lies on the lance12 via two packings 28, which are arranged on both sides of the hollow space 15 32. To apply pressure to the inflatable seal 30 pressure is advantageously fed to the chamber 8. This is done. e.g. by supplying a pressure medium to the chamber via a supply opening 34. The chamber 8 is connected via openings 36 in the ring 22 to the hollow space 30, with the result that the pressure medium enters the inflatable seal 30. Finally, it should be noted that the inflatable seal 20 30 can be inflated by a liquid under pressure or a gas under pressure.
Viewed in the direction of introduction of the lance 12 an inlet opening 38 for lubricant is provided in the rib 10 of casing 2 behind the chamber 8.
Consequently lubricant enters the annular hollow space 40, which is limited axially on the environment side by the ring 22 and on the shaft furnace side by 25 the central sealing element 14 and is enclosed radially on the inside by the lance 12 and on the outside by the rib 10. The lubricant serves both to lubricate the packings with the result that their wear is reduced during movement of the lance and also to coat the lance with an anti-corrosion film.
An inlet opening 42 for sealing gas is provided in front of the sealing element 16 30 in the direction of introduction. Sealing air at high pressure can be blown into the hollow space 44 through this opening 42. If the pressure in the hollow space
casing 2 enables the rings 20, 22 to be adapted to an inclined or axially displaced position of the lance 12 in the sealing device. Hence the rings with the sealing elements can centre freely on the lance 12, if the lance is introduced through the sealing device at an angle or axially displaced.
5 The rings 20, 22 constitute holders for packings or seals, which rest on the lance 12. For example, the ring 20 is provided on the inside with a packing consisting of two packing rings 26, via which it rests on the lance 12. The ring22 has an inflatable seal 30, which is accommodated in a hollow space 32 in ring 22. In the uninflated position this inflatable seal 30 is retracted into its 10 hollow space 32; this enables the lance 12 to move without damage or wear to the inflatable seal 30. In the inflated position, the inflatable seal 30 can, however, compensate for substantially larger radial play than the two packing rings 26 of the sealing element 16. The ring 22 advantageously lies on the lance12 via two packings 28, which are arranged on both sides of the hollow space 15 32. To apply pressure to the inflatable seal 30 pressure is advantageously fed to the chamber 8. This is done. e.g. by supplying a pressure medium to the chamber via a supply opening 34. The chamber 8 is connected via openings 36 in the ring 22 to the hollow space 30, with the result that the pressure medium enters the inflatable seal 30. Finally, it should be noted that the inflatable seal 20 30 can be inflated by a liquid under pressure or a gas under pressure.
Viewed in the direction of introduction of the lance 12 an inlet opening 38 for lubricant is provided in the rib 10 of casing 2 behind the chamber 8.
Consequently lubricant enters the annular hollow space 40, which is limited axially on the environment side by the ring 22 and on the shaft furnace side by 25 the central sealing element 14 and is enclosed radially on the inside by the lance 12 and on the outside by the rib 10. The lubricant serves both to lubricate the packings with the result that their wear is reduced during movement of the lance and also to coat the lance with an anti-corrosion film.
An inlet opening 42 for sealing gas is provided in front of the sealing element 16 30 in the direction of introduction. Sealing air at high pressure can be blown into the hollow space 44 through this opening 42. If the pressure in the hollow space
9 P-PWU-3 1 ~/WO
44 is greater than the pressure in the shaft furnace gases harmful to health such as carbon monoxide are prevented from escaping from the shaft furnace in the event of a leak in the sealing element 16.
The central sealing element 14 is shown in enlarged form in Fig. 2. It comprises5 an inner casing 46 with an end wall on the shaft furnace side and on the environment side, which are provided with an opening for a lance 12. This inner casing is mounted in the central chamber 6 of the outer casing 2 in such a way that it can be moved at right angle to the central axis 24 of the sealing device.
This possibility of displacement of the inner casing 46 in the chamber 6 of
44 is greater than the pressure in the shaft furnace gases harmful to health such as carbon monoxide are prevented from escaping from the shaft furnace in the event of a leak in the sealing element 16.
The central sealing element 14 is shown in enlarged form in Fig. 2. It comprises5 an inner casing 46 with an end wall on the shaft furnace side and on the environment side, which are provided with an opening for a lance 12. This inner casing is mounted in the central chamber 6 of the outer casing 2 in such a way that it can be moved at right angle to the central axis 24 of the sealing device.
This possibility of displacement of the inner casing 46 in the chamber 6 of
10 casing 2 enables free centering of the inner casing 46 on the lance 12, as in the case of rings 20, 22, if the lance is introduced at an angle or with axial displacement through the sealing device.
At its two end walls the inner casing 46 is sealed axially against the ribs 10 of the outer casing 2 with annular seals 48, which are seated in a groove cut into 15 the front sides coaxially with the axis 24. Inside ihe casing 46 a packing 50cG"sisting of two packing rings is arranged coaxially with the axis 24 both on the shaft furnace side and on the environment side. These packings 50 preferably rest against the respective end wall of the inner casing 46. They are dimensioned in such a way that they rest on the lance 12, if the latter is pushed 20 into the sealing device. To increase the tightness still further when the lance 12 is introduced, two annular pistons 52 are provided in the casing 46. These annular pistons 52 are guided radially outwards on the inner wall of the inner casing 46, whereas they are guided inwards by a guide sleeve 54, which is arranged coaxially with the axis 24 and its inside width is dimensioned in such a 25 way that the lance has a certain radial play in the sleeve 54. The annular pistons are each sealed by two annular seals 56, e.g. O-rings or quad rings, radially against the inner casing 46 and the guide sleeve 54 with the result that a sealed pressure chamber 58 is formed between the pistons in an axial direction.
30 To actuate the pistons 52 simultaneously, the pressure chamber 58 is pressurised. This is preferably done by supplying a pressure medium via a CA 022169~1 1997-09-30 supply opening 60 to the chamber 6 sealed by the annular seals 48. The chamber 6 is connected to the pressure chamber 58 via openings 62 in the casing 46 with the result that the pressure medium enters the pressure chamber 58. It should be noted that the admission of pressure to the pressure chamber 5 58 can be carried out by a liquid or gas under pressure.
The annular pistons 52 are axially movable, so that on actuation one of the piston is forced against the packing resting on the end-wall on the shaft-furnace side whereas the other piston is forced against the packing resting on the end wall on the environment side. The resulting axial pressure exerted forces the 10 packings 50 against the respective end wall of the inner casing 46 and compresses them axially, whereby they extend radially. This causes the packings to fit more tightly against the lance 12 with the result that the tightness of the entire device is increased.
To withdraw the lance 12 from the device, the overpressure in the chamber 6 15 and the- pressure chamber 58 is first reduced. Consequently the prsssure exerted by tt,e pistons 52 on the packings 50 is discontinued and the packings 50 can extend axially again with the result that the radial extension is partially reversed. To ensure that the packings 50 resume their original shape, each packing is provided with an elastic element 64 in its interior, which is mounted20 concentrically with the axis 24 of the device and is enclosed by the packing on its entire circumference. This elastic element 64, e.g. a rubber core, causes atleast partial reversal of the axial deformation of the packing when the piston is not actuated. The packing 50 thus rests less tightly against the lance 12 with the result that the frictional resistance and thus also the wear is considerably 25 reduced. The life of the packings 50 is thus in turn prolonged and they need not be replaced as frequently.
To ensure a certain continuous pretension of the packings and thus a certain tightness, an elastic means 66, e.g. a spiral spring, can be arranged optionallyin the pressure chamber 58 between the two pistons 52. This is shown in Fig. 3.
30 This spring 66 presses the pistons against the packings with a certain force even if the pressure chamber 58 is not under pressure. It should be noted that CA 022169~1 1997-09-30 1 1 P-PWu-317/~VO
the spring force of spring 66 should be smaller than the spring force of the elastic means 46 in the packings 50, because otherwise the deformation of the packings cannot be reversed (even partially).
Fig. 4 shows a further variant of the sealing element 14. In this embodiment no 5 annular seals 56 are used to seal the pressure chamber 58. Instead the entire pressure chamber 58 is lined with an elastic seal 68, which is clamped with an insert 70 in the inner casing 46. This seal 68 is likewise subjected to pressureas in the preceding exemplified embodiments. As the seal 68 is supported against the guide sleeve 54 radially towards the axis 24, it extends in an axial10 direction with the result that the two pistons 52 are again actuated simultaneously.
Fig. 5 shows a further possible embodiment of the sealing element 14. In this variant the two pistons 52 are actuated only by an elastic means 72. This advantageously comprises a spiral spring and is pretensioned in such a way 15 that the spring force exerted is adequate to compress the packings 50 axiallyvia ~he pistons 52. The sealing element thus automatically adapts to variations in the lance cross-section.
A further externally controllable variant is shown in Fig. 6. The two pistons 52are actuated by wedge-shaped elements 74, which are mounted between the 20 two pistons 52 in such a way that they force the two pistons 52 axially apart by radial displacement towards the axis. The actuating elements 74 have a part 76 facing radially outwards with lateral faces parallel with each other. The elements 74 are guided by these lateral faces in a guide opening 78 in the inner casing 46 and sealed against them by flexible seals 80.
25 The wedge-shaped elements 74 are actuated by admission of pressure to chamber 6 via the inlet opening 60. The overpressure building up in the chamber acts on the outer lateral face of the wedge-shaped elements 74 and exerts on them a force directed radially inwards. When the overpressure is discharged from the chamber 6 the elements 74 are again pushed radially 30 outwards by elastic means 82. These elastic means 82 advantageously comprise a spiral spring, which is supported radially inwards on the guide CA 022169~1 1997-09-30 12 P-PWU-31~/WO
sleeve 54, and presses radially outwards against the inner surface of the actuating element 74. To prevent the actuating elements 74 being pushed radially outwards from the guide openings 78 by the spring 82 when the chamber 6 is pressureless, stops 84 are provided on the outside of the guide 5 openings 78.
A further variant, which adapts automatically to changes in cross-section, is based on the embodiment in Fig. 6. This is shown in Fig. 7. In this case the wedge-shaped elements 74 are no longer actuated by admission of pressure to chamber 6, but by an elastic element 86, which is laid around the outside of the10 wedge-shaped actuating elements 74. This elastic element 86 may for example, be a spiral spring ring or a ring made from an elastic plastic, which is fitted pretensioned in an annular groove 88, which is cut coaxially with the axis into the parts 76 of the actuating elements 74 radially inwards from the outer lateral face. It should be noted that in this variant the flexible seals 80 are unnecessary 15 just like the inlet opening 60.
Fig. 8 shows a cross-section along the line A-A' in Fig. 1 at right angles to the axis through a sealing device when the lance 12 is inserted. It can be seen thatthe lance 12 and thus the opening in this case do not have a circular cross-section, but a non-circular cross-section. However, this is only one possible 20 embodiment; the lance cross-section may, of course, also be circular.
The lance 12, which is introduced into the opening 90 in the inner casing 46 in such a way that a certain play exists between the lance 12 and the inner casing 46, can be seen in the centre of the arrangement. The chamber 6 which is limited inwards by the inner casing 46 and outwards by the outer casing 2, can 25 also be seen in the outer area of the arrangement in Fig. 8.
The inner face of the opening 90 is coated in its upper area with a material 92,which has particularly good sliding properties. This material 92, with which theupper partial areas of the inner faces of the rings 20, 22 are also coated, reduces the friction of rings 20, 22 or the sealing element 14 on the lance and 30 thus prevents rapid wear of the areas, which during centering of the rings 20, 22 or sealing element 14 on the lance 12 rest and slide to and fro on the latter.
At its two end walls the inner casing 46 is sealed axially against the ribs 10 of the outer casing 2 with annular seals 48, which are seated in a groove cut into 15 the front sides coaxially with the axis 24. Inside ihe casing 46 a packing 50cG"sisting of two packing rings is arranged coaxially with the axis 24 both on the shaft furnace side and on the environment side. These packings 50 preferably rest against the respective end wall of the inner casing 46. They are dimensioned in such a way that they rest on the lance 12, if the latter is pushed 20 into the sealing device. To increase the tightness still further when the lance 12 is introduced, two annular pistons 52 are provided in the casing 46. These annular pistons 52 are guided radially outwards on the inner wall of the inner casing 46, whereas they are guided inwards by a guide sleeve 54, which is arranged coaxially with the axis 24 and its inside width is dimensioned in such a 25 way that the lance has a certain radial play in the sleeve 54. The annular pistons are each sealed by two annular seals 56, e.g. O-rings or quad rings, radially against the inner casing 46 and the guide sleeve 54 with the result that a sealed pressure chamber 58 is formed between the pistons in an axial direction.
30 To actuate the pistons 52 simultaneously, the pressure chamber 58 is pressurised. This is preferably done by supplying a pressure medium via a CA 022169~1 1997-09-30 supply opening 60 to the chamber 6 sealed by the annular seals 48. The chamber 6 is connected to the pressure chamber 58 via openings 62 in the casing 46 with the result that the pressure medium enters the pressure chamber 58. It should be noted that the admission of pressure to the pressure chamber 5 58 can be carried out by a liquid or gas under pressure.
The annular pistons 52 are axially movable, so that on actuation one of the piston is forced against the packing resting on the end-wall on the shaft-furnace side whereas the other piston is forced against the packing resting on the end wall on the environment side. The resulting axial pressure exerted forces the 10 packings 50 against the respective end wall of the inner casing 46 and compresses them axially, whereby they extend radially. This causes the packings to fit more tightly against the lance 12 with the result that the tightness of the entire device is increased.
To withdraw the lance 12 from the device, the overpressure in the chamber 6 15 and the- pressure chamber 58 is first reduced. Consequently the prsssure exerted by tt,e pistons 52 on the packings 50 is discontinued and the packings 50 can extend axially again with the result that the radial extension is partially reversed. To ensure that the packings 50 resume their original shape, each packing is provided with an elastic element 64 in its interior, which is mounted20 concentrically with the axis 24 of the device and is enclosed by the packing on its entire circumference. This elastic element 64, e.g. a rubber core, causes atleast partial reversal of the axial deformation of the packing when the piston is not actuated. The packing 50 thus rests less tightly against the lance 12 with the result that the frictional resistance and thus also the wear is considerably 25 reduced. The life of the packings 50 is thus in turn prolonged and they need not be replaced as frequently.
To ensure a certain continuous pretension of the packings and thus a certain tightness, an elastic means 66, e.g. a spiral spring, can be arranged optionallyin the pressure chamber 58 between the two pistons 52. This is shown in Fig. 3.
30 This spring 66 presses the pistons against the packings with a certain force even if the pressure chamber 58 is not under pressure. It should be noted that CA 022169~1 1997-09-30 1 1 P-PWu-317/~VO
the spring force of spring 66 should be smaller than the spring force of the elastic means 46 in the packings 50, because otherwise the deformation of the packings cannot be reversed (even partially).
Fig. 4 shows a further variant of the sealing element 14. In this embodiment no 5 annular seals 56 are used to seal the pressure chamber 58. Instead the entire pressure chamber 58 is lined with an elastic seal 68, which is clamped with an insert 70 in the inner casing 46. This seal 68 is likewise subjected to pressureas in the preceding exemplified embodiments. As the seal 68 is supported against the guide sleeve 54 radially towards the axis 24, it extends in an axial10 direction with the result that the two pistons 52 are again actuated simultaneously.
Fig. 5 shows a further possible embodiment of the sealing element 14. In this variant the two pistons 52 are actuated only by an elastic means 72. This advantageously comprises a spiral spring and is pretensioned in such a way 15 that the spring force exerted is adequate to compress the packings 50 axiallyvia ~he pistons 52. The sealing element thus automatically adapts to variations in the lance cross-section.
A further externally controllable variant is shown in Fig. 6. The two pistons 52are actuated by wedge-shaped elements 74, which are mounted between the 20 two pistons 52 in such a way that they force the two pistons 52 axially apart by radial displacement towards the axis. The actuating elements 74 have a part 76 facing radially outwards with lateral faces parallel with each other. The elements 74 are guided by these lateral faces in a guide opening 78 in the inner casing 46 and sealed against them by flexible seals 80.
25 The wedge-shaped elements 74 are actuated by admission of pressure to chamber 6 via the inlet opening 60. The overpressure building up in the chamber acts on the outer lateral face of the wedge-shaped elements 74 and exerts on them a force directed radially inwards. When the overpressure is discharged from the chamber 6 the elements 74 are again pushed radially 30 outwards by elastic means 82. These elastic means 82 advantageously comprise a spiral spring, which is supported radially inwards on the guide CA 022169~1 1997-09-30 12 P-PWU-31~/WO
sleeve 54, and presses radially outwards against the inner surface of the actuating element 74. To prevent the actuating elements 74 being pushed radially outwards from the guide openings 78 by the spring 82 when the chamber 6 is pressureless, stops 84 are provided on the outside of the guide 5 openings 78.
A further variant, which adapts automatically to changes in cross-section, is based on the embodiment in Fig. 6. This is shown in Fig. 7. In this case the wedge-shaped elements 74 are no longer actuated by admission of pressure to chamber 6, but by an elastic element 86, which is laid around the outside of the10 wedge-shaped actuating elements 74. This elastic element 86 may for example, be a spiral spring ring or a ring made from an elastic plastic, which is fitted pretensioned in an annular groove 88, which is cut coaxially with the axis into the parts 76 of the actuating elements 74 radially inwards from the outer lateral face. It should be noted that in this variant the flexible seals 80 are unnecessary 15 just like the inlet opening 60.
Fig. 8 shows a cross-section along the line A-A' in Fig. 1 at right angles to the axis through a sealing device when the lance 12 is inserted. It can be seen thatthe lance 12 and thus the opening in this case do not have a circular cross-section, but a non-circular cross-section. However, this is only one possible 20 embodiment; the lance cross-section may, of course, also be circular.
The lance 12, which is introduced into the opening 90 in the inner casing 46 in such a way that a certain play exists between the lance 12 and the inner casing 46, can be seen in the centre of the arrangement. The chamber 6 which is limited inwards by the inner casing 46 and outwards by the outer casing 2, can 25 also be seen in the outer area of the arrangement in Fig. 8.
The inner face of the opening 90 is coated in its upper area with a material 92,which has particularly good sliding properties. This material 92, with which theupper partial areas of the inner faces of the rings 20, 22 are also coated, reduces the friction of rings 20, 22 or the sealing element 14 on the lance and 30 thus prevents rapid wear of the areas, which during centering of the rings 20, 22 or sealing element 14 on the lance 12 rest and slide to and fro on the latter.
Claims (16)
1. Device for sealing a lance (12) to an opening for leading the lance (12) intoa container under pressure, in particular a shaft furnace, which comprises an outer casing (2) with an end wall on the shaft furnace side and on the environment side, which are provided axially with an opening for a lance (12) and a sealing element (14) arranged in the outer casing (2), characterised in that the sealing element (14) comprises an inner casing (46) with axial end walls provided with an opening for the lance as well as at least one packing (50) and at least one axially movable annular piston (52), which are arranged coaxially with an axis (24) of the inner casing (46) inside the latter, the packing (50) is arranged between the piston (52) and one of the end walls of the inner casing (46) in the actuating direction of the piston (52), the packing (50) can be compressed by actuation of the piston (52) axially against one of the end walls of the inner casing (46) whereby the packing (50) extends radially and forms a seal around a lance (12) which has been led through, and the inner casing (46) can be moved radially in the outer casing (2), so that the inner casing (46) together with the packing (50) and the piston (52) is self-centering on a lance (12).
2. Sealing device according to claim 1, characterised in that the sealing element (14) comprises two pistons (52) and two packings (50), which are arranged coaxially with the axis (24) of the inner casing (46), in that the two pistons (52) are arranged axially between the two packings (50), in that they act in opposite directions on actuation and that each of the packings (50) can be compressed by a piston (52) against one of the end walls of the inner casing (46).
3. Sealing device according to claim 1 or 2, characterised in that an elastic element (64), which is enclosed by the packing (50) and which at least partially reverses the axial deformation of the packing (50) when the piston (52) is not actuated, is mounted inside the at least one packing (50) concentrically with the axis (24) of the device.
Sealing device according to one of claims 1 to 3, characterised in that annular flexible seals (48), which seal the inner casing (46) against the end walls of the outer casing (2), are provided on the end walls of the inner casing (46).
5. Sealing device according to one of claims 2 to 4, characterised in that an annular pressure chamber (58) is arranged between the two pistons (52).
6. Sealing device according to one of claims 2 to 5, characterised in that each of the pistons (52) is sealed with an inner annular seal (56) radially inwards against a guide sleeve (54) mounted coaxially with the axis (24) and is sealed radially outwards with an outer annular seal (56) against the inner face of the inner casing (46).
7. Sealing device according to claim 5, characterised in that an elastic seal (68), which seals the pressure chamber (58) from the outside, is arranged in the pressure chamber (58).
8. Sealing device according to one of claims 5 to 7, characterised in that the pistons (52) can be actuated by admission of a pressure medium to the pressure chamber (58).
9. Sealing device according to one of claims 2 to 7, characterised in that elastic means (66, 72), which can actuate the pistons (52), are arranged between the latter.
10. Sealing device according to one of claims 2 to 4, characterised in that radially movable, wedge-shaped elements (74), which can actuate the pistons (52), are arranged between the latter.
11. Sealing device according to claim 10, characterised in that the wedge-shaped elements (74) can be moved radially inwards by admission of a pressure medium to a chamber (6) between the inner and outer casing.
12. Sealing device according to claim 10, characterised in that elastic means (86), which exert a force directed radially inwards on the wedge-shaped elements (74), are arranged around the wedge-shaped elements (74).
13. Sealing device according to claim 12, characterised in that the elastic means (86) comprise a pretensioned spiral spring ring.
14. Sealing device according to claim 12, characterised in that the elastic means (86) comprises a pretensioned ring made from elastic plastic.
15. Sealing device according to one of claims 12 to 14, characterised in that elastic means (82), which are supported radially inwards on the guide sleeve (54) and are forced radially outwards against the wedge-shaped elements (74), are arranged between the guide sleeve (54) and the wedge-shaped elements (74).
16. Sealing device according to one of claims 1 to 15, characterised in that supporting surfaces with which the inner casing (46) rests on the lance (12), are coated with a material (92), which reduces the frictional resistance of the supporting surfaces on the lance (12).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU88600 | 1995-03-31 | ||
| LU88600A LU88600A1 (en) | 1995-03-31 | 1995-03-31 | Device for sealing a lance in an opening for passing the lance into a pressurized container |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2216951A1 true CA2216951A1 (en) | 1996-10-03 |
Family
ID=19731522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002216951A Abandoned CA2216951A1 (en) | 1995-03-31 | 1996-03-09 | Device for sealing a lance into an aperture through which the lance can be introduced into a pressurized vessel |
Country Status (15)
| Country | Link |
|---|---|
| EP (1) | EP0817867B1 (en) |
| KR (1) | KR19980703332A (en) |
| CN (1) | CN1049923C (en) |
| AT (1) | ATE173025T1 (en) |
| AU (1) | AU5105096A (en) |
| BR (1) | BR9607993A (en) |
| CA (1) | CA2216951A1 (en) |
| CZ (1) | CZ285733B6 (en) |
| DE (1) | DE59600782D1 (en) |
| ES (1) | ES2124091T3 (en) |
| LU (1) | LU88600A1 (en) |
| PL (1) | PL185233B1 (en) |
| RU (1) | RU2149189C1 (en) |
| UA (1) | UA40667C2 (en) |
| WO (1) | WO1996030548A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5928603A (en) * | 1995-03-31 | 1999-07-27 | Paul Wurth S.A. | Device for sealing a lance in an opening for introduction of the lance into a container under pressure |
| KR100456741B1 (en) * | 1997-12-17 | 2004-11-10 | 다이셀 가가꾸 고교 가부시끼가이샤 | Gas producer for air bag |
| CN111550557A (en) * | 2020-05-11 | 2020-08-18 | 山东省章丘鼓风机股份有限公司 | Electric compression packing sealing device and control method thereof |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2273129A (en) * | 1939-06-07 | 1942-02-17 | Messinger William | Bearing seal |
| GB1025384A (en) * | 1962-04-25 | 1966-04-06 | Nat Res Dev | Improvements in or relating to seals |
| US3434728A (en) * | 1966-09-26 | 1969-03-25 | Paul C Soldato | Means of automatically adjusting hydraulic pneumatic packings |
| FR1600190A (en) * | 1968-12-31 | 1970-07-20 | ||
| DE2816930C2 (en) * | 1978-04-19 | 1984-06-28 | Daume, Achim, Dipl.-Ing., 3006 Burgwedel | Stuffing box seal |
| US4908179A (en) * | 1985-06-26 | 1990-03-13 | Combustion Engineering, Inc. | Reinforced inflatable seal |
| LU88279A1 (en) * | 1993-05-27 | 1994-12-01 | Wurth Paul Sa | Device for introducing a slender lance into a pressure tank, in particular a blast furnace |
| NO177779C (en) * | 1993-07-06 | 1995-11-22 | Statoil As | Sealing device for a swivel |
-
1995
- 1995-03-31 LU LU88600A patent/LU88600A1/en unknown
-
1996
- 1996-03-09 UA UA97105305A patent/UA40667C2/en unknown
- 1996-03-09 ES ES96907411T patent/ES2124091T3/en not_active Expired - Lifetime
- 1996-03-09 EP EP96907411A patent/EP0817867B1/en not_active Expired - Lifetime
- 1996-03-09 AT AT96907411T patent/ATE173025T1/en active
- 1996-03-09 PL PL96322653A patent/PL185233B1/en unknown
- 1996-03-09 RU RU97118354A patent/RU2149189C1/en active
- 1996-03-09 AU AU51050/96A patent/AU5105096A/en not_active Abandoned
- 1996-03-09 CZ CZ973077A patent/CZ285733B6/en not_active IP Right Cessation
- 1996-03-09 DE DE59600782T patent/DE59600782D1/en not_active Expired - Lifetime
- 1996-03-09 CN CN96192965A patent/CN1049923C/en not_active Expired - Lifetime
- 1996-03-09 BR BR9607993A patent/BR9607993A/en not_active IP Right Cessation
- 1996-03-09 KR KR1019970706737A patent/KR19980703332A/en not_active Application Discontinuation
- 1996-03-09 WO PCT/EP1996/001018 patent/WO1996030548A1/en not_active Application Discontinuation
- 1996-03-09 CA CA002216951A patent/CA2216951A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1996030548A1 (en) | 1996-10-03 |
| PL185233B1 (en) | 2003-04-30 |
| BR9607993A (en) | 1998-06-23 |
| RU2149189C1 (en) | 2000-05-20 |
| PL322653A1 (en) | 1998-02-16 |
| CZ307797A3 (en) | 1998-05-13 |
| ATE173025T1 (en) | 1998-11-15 |
| CN1179798A (en) | 1998-04-22 |
| CN1049923C (en) | 2000-03-01 |
| ES2124091T3 (en) | 1999-01-16 |
| KR19980703332A (en) | 1998-10-15 |
| UA40667C2 (en) | 2001-08-15 |
| EP0817867A1 (en) | 1998-01-14 |
| DE59600782D1 (en) | 1998-12-10 |
| CZ285733B6 (en) | 1999-10-13 |
| AU5105096A (en) | 1996-10-16 |
| EP0817867B1 (en) | 1998-11-04 |
| LU88600A1 (en) | 1996-10-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |