CN112377069A

CN112377069A - Composite wooden door

Info

Publication number: CN112377069A
Application number: CN202011261215.0A
Authority: CN
Inventors: 丰贤胜; 戚超
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-02-19

Abstract

The invention relates to the technical field of wooden doors, in particular to a composite wooden door which comprises a door frame, a door leaf and a hinge for connecting the door frame and the door leaf; the inner side of the door frame is in a step shape, and the outer side of the door leaf is provided with a step-shaped bridge cut-off structure matched with the door frame; flame-retardant rubber strips arranged in the vertical direction are fixedly arranged on each step surface of the step-shaped bridge cut-off structure; through the arrangement of the stepped bridge-cut-off structure and the flame-retardant rubber strips, the inner side surfaces corresponding to the door frame can be contacted and form a plurality of annular air faults when the door leaf is closed, so that the cold bridge effect is avoided, and the heat insulation, sound insulation and environment protection effects are further improved; meanwhile, the flame-retardant rubber strip can generate elastic deformation when the door leaf is closed, so that the sealing of the stepped bridge-cut structure is tighter, dense smoke is prevented from permeating through a gap between the door leaf and the door frame when a fire occurs, and the isolation effect on smoke is improved.

Description

Composite wooden door

Technical Field

The invention relates to the technical field of wood doors, in particular to a composite wood door.

Background

At present, most of doors and windows in the market are made of wood materials, aluminum alloy materials, steel materials and the like, wherein the doors and windows made of the wood materials are widely applied due to the advantages of convenience in processing, low price, good texture and the like. In order to respond to the sustainable development strategy advocated by the state and reduce the felling of wood, most of the common wood doors in the prior art are composite wood doors, namely, the wood doors are formed by overlapping and compounding wood and other materials. But the compound timber among the prior art gives sound insulation effect poor, seriously influences the sound environment in people's private space, and simultaneously, general compound timber does not have the fire prevention function, and technical personnel in this field need urgently to develop a compound timber that gives sound insulation effectually, fire behavior is good and satisfy the demand in market.

The Chinese patent (application number: 2019202149216) discloses a mute fireproof composite wooden door, which comprises a composite wooden door main body, wherein a sound insulation layer and a fireproof layer are arranged on the composite wooden door main body, an installation cavity is arranged in the composite wooden door main body, the sound insulation layer comprises a sound insulation plate arranged in the installation cavity, the sound insulation plate is a bridge opening mechanical plate, the bridge opening mechanical plate comprises a bridge opening mechanical plate main body and a plurality of through holes transversely penetrating through the side wall of the bridge opening mechanical plate main body, and the through holes are parallel to each other; the sound insulation layer and the fireproof layer are arranged on the composite wood door main body, so that the sound insulation effect and the fireproof effect of the composite wood door main body are improved; however, the device has the following disadvantages: dense smoke is easy to permeate through a gap between the door leaf and the door frame, so that the smoke isolation effect is poor; in addition, when a fire occurs, the temperature of the surface of the door leaf is higher, the surface of the door leaf cannot be cooled, and the flame retardant effect is poor.

The composite wooden door is designed, and through the arrangement of the stepped bridge-cut structure and the flame-retardant rubber strips, the composite wooden door can be contacted with the inner side surface corresponding to the door frame when the door leaf is closed and form a plurality of annular air faults, so that the generation of a cold bridge effect is avoided, and the effects of heat insulation, sound insulation and environmental protection are further improved; meanwhile, the flame-retardant rubber strip can generate elastic deformation when the door leaf is closed, so that the sealing of the stepped bridge-cut structure is tighter, dense smoke is prevented from permeating through a gap between the door leaf and the door frame when a fire occurs, and the isolation effect on smoke is improved.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problem that dense smoke is easy to permeate through a gap between a door leaf and a door frame when a fire occurs in the conventional composite wooden door, so that the smoke is poor in isolation effect, the composite wooden door provided by the invention is used.

The technical scheme adopted by the invention for solving the technical problems is as follows: a composite wooden door comprises a door frame, a door leaf and a hinge for connecting the door frame and the door leaf; the inner side of the door frame is in a step shape, and the outer side of the door leaf is provided with a step-shaped bridge cut-off structure matched with the door frame; flame-retardant rubber strips arranged in the vertical direction are fixedly arranged on each step surface of the step-shaped bridge cut-off structure, and the flame-retardant rubber strips can be contacted with the inner side surface corresponding to the door frame when the door leaf is closed and form a plurality of annular air faults; the door leaf is formed by bonding a panel and a wood base plate, and the panel is positioned on the left side of the wood base plate.

When the door leaf is used, the stepped bridge-cut structure and the flame-retardant rubber strips are arranged, so that the inner side surfaces corresponding to the door frame can be contacted and form a plurality of annular air faults when the door leaf is closed, the cold bridge effect is avoided, and the heat insulation, sound insulation and environment protection effects are improved; meanwhile, the flame-retardant rubber strip can reduce the impact of the door leaf on the door frame in the closing process of the door leaf, so that the problem that the door frame is damaged due to impact is avoided, and the service life is prolonged; in addition, the flame retardant rubber strip can generate elastic deformation when the door leaf is closed, so that the sealing of the stepped bridge-cut structure is tighter, dense smoke is prevented from permeating through a gap between the door leaf and a door frame when a fire occurs, and the isolation effect on smoke is improved.

Preferably, the door frame is formed by bonding perlite fireproof plate, a solid wood layer and an aerogel board which are sequentially arranged from left to right, and a fireproof adhesive layer is arranged on the periphery of the door frame. The fireproof glue layer and the perlite fireproof plate are arranged, so that the fire can be better prevented from spreading, and the problem of door frame ignition is avoided; the aerogel plate is used for better improving the heat insulation and sound insulation effects.

Preferably, a storage cavity is arranged in the upper portion of the panel, sodium bicarbonate is filled in the storage cavity, a vertical pipe is arranged in the storage cavity, the upper end of the vertical pipe extends to the upper end of the storage cavity, the lower end of the vertical pipe is fixed at the lower end of the storage cavity, a spray pipe communicated with the lower end of the vertical pipe is arranged in the panel, the spray pipe is horizontally arranged, and the other end of the spray pipe extends to the outside of the left side of the panel. Because sodium bicarbonate is heated easy decomposition to begin to decompose gradually at more than 50 ℃ and generate sodium carbonate, carbon dioxide and water, consequently when taking place the condition of a fire, storage intracavity temperature rises, and sodium bicarbonate is heated decomposition, because this decomposition process is the endothermic process, consequently can reduce the peripheral temperature of door leaf, and then delay spreading of the intensity of a fire, the carbon dioxide of its production can be followed the spray tube blowout through the standpipe simultaneously, and then keeps apart the peripheral air of door leaf, builds the oxygen deficiency environment and lets the fire extinguish, thereby reaches better fire-retardant effect.

Preferably, a sealing plug which is in sliding seal with the standpipe is arranged in the lower end of the standpipe, and the lower end of the sealing plug is connected with a panel below the sealing plug through a spring; the sealing plug upper end is provided with the inserted block, be provided with the through-hole in the inserted block, the through-hole passes the sealing plug and extends to the sealing plug side and its tip is higher than the spray tube and arranges, the through-hole can communicate spray tube and standpipe when the sealing plug pressurized moves down. Through the setting of sealing plug and spring, can make the initial time sealing plug block up the spray tube, both avoid moist air to get into the problem that leads to the slow decomposition of the sodium bicarbonate in the storage chamber and became invalid, can make the pressure increase in the standpipe again for spray tube spun carbon dioxide speed increases, and then increase fire-retardant scope.

Preferably, the step face of flame retardant rubber strip one side is gone up the fixed fire-retardant gasbag that is provided with, be provided with the fire-retardant gasbag of intercommunication and store the gas channel on chamber upper portion in the base plate. Through the setting of fire-retardant gasbag, can make before the blowout carbon dioxide make partial carbon dioxide get into in the fire-retardant gasbag earlier, make its inflation, through hugging closely of gasbag and door frame inner wall and dense cigarette sees through from the gap between door leaf and the door frame when avoiding taking place the condition of a fire, thereby the isolation effect to the flue gas has been improved, the fire-retardant gasbag of inflation simultaneously can also extrude the fire-retardant rubber strip on next door, the mode through increasing pressure makes the sealed of fire-retardant rubber strip more tight, can strengthen the initiative isolation effect of flue gas before the spray tube puts out a fire, further improve the isolation effect to the flue gas.

Preferably, storage intracavity lower part is provided with the leak protection net that is used for depositing sodium bicarbonate, the storage chamber of leak protection net below constitutes the liquid storage chamber, in the liquid storage chamber bottom extends to the riser through the right angle return bend, the right angle return bend in the riser is vertical downwardly extending, the inserted block insert in the right angle return bend and with right angle return bend inner wall sliding seal. Through the setting in stock solution chamber, can realize the collection of sodium bicarbonate decomposition back water, hydroenergy after the collection can be enough in the right angle return bend gets into the through-hole, and carry out a period at the decomposition reaction, after the increase of storage intracavity pressure, the sealing plug moves down and makes through-hole and spray tube intercommunication, the high pressure environment of storage intracavity this moment can go into the water pressure in the spray tube, and the high-speed blowout of water follow spray tube that makes, and then carry out the omnidirectional humidification to the panel surface of door leaf, play the effect of cooling or even putting out a fire, consequently, flame retardant efficiency has been improved.

The invention has the following beneficial effects:

1. according to the composite wood door, due to the arrangement of the stepped bridge-cut structure and the flame-retardant rubber strips, when the door leaf is closed, the inner side face corresponding to the door frame can be contacted with the door leaf, a plurality of annular air faults are formed, the cold bridge effect is avoided, and the heat insulation, sound insulation and environment protection effects are further improved; meanwhile, the flame-retardant rubber strip can generate elastic deformation when the door leaf is closed, so that the sealing of the stepped bridge-cut structure is tighter, dense smoke is prevented from permeating through a gap between the door leaf and the door frame when a fire occurs, and the isolation effect on smoke is improved.

2. According to the composite wood door, the storage cavity is filled with the sodium bicarbonate, when a fire occurs, the temperature in the storage cavity rises, the sodium bicarbonate is heated and decomposed, and the decomposition process is a heat absorption process, so that the temperature around the door leaf can be reduced, the spread of the fire is delayed, meanwhile, the generated carbon dioxide can be sprayed out from the spray pipe through the vertical pipe, the air around the door leaf is isolated, an anoxic environment is created, the fire is extinguished, and a good flame retardant effect is achieved.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of the invention in a top view;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a front cross-sectional view of the present invention at a standpipe;

fig. 5 is a partially enlarged view at B in fig. 4.

In the figure:

1. a door frame; 11. a solid wood layer; 12. perlite fire-proof plates; 13. an aerogel plate; 14. a fireproof glue layer; 2. a door leaf; 21. a stepped bridge cut-off structure; 22. a flame retardant rubber strip; 23. a panel; 24. a wood substrate; 25. a storage chamber; 26. a gas passage; 27. a flame-retardant air bag; 28. a leakage-proof net; 29. a liquid storage cavity; 3. a nozzle; 4. a vertical tube; 41. a sealing plug; 42. a spring; 43. a right-angle bent pipe; 44. inserting a block; 45. and a through hole.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the composite wood door comprises a door frame 1, a door leaf 2 and a hinge for connecting the door frame 1 and the door leaf 2; the inner side of the door frame 1 is in a step shape, and the outer side of the door leaf 2 is provided with a step-shaped bridge cut-off structure 21 matched with the door frame 1; each step surface of the step-shaped bridge cut-off structure 21 is fixedly provided with a flame-retardant rubber strip 22 which is arranged along the vertical direction, and the flame-retardant rubber strips 22 can be contacted with the inner side surface corresponding to the door frame 1 when the door leaf 2 is closed and form a plurality of annular air faults; the door leaf 2 is formed by bonding a panel 23 and a wood base plate 24, and the panel 23 is positioned on the left side of the wood base plate 24.

When the door leaf 2 is closed, the inner side face corresponding to the door frame 1 is contacted with the door leaf 2 to form a plurality of annular air faults through the arrangement of the stepped bridge-cut structure 21 and the flame-retardant rubber strips 22, so that the cold bridge effect is avoided, and the heat insulation, sound insulation and environment protection effects are further improved; meanwhile, the flame-retardant rubber strip 22 can reduce the impact of the door leaf 2 on the door frame 1 in the closing process of the door leaf 2, so that the problem that the door frame 1 is damaged due to impact is avoided, and the service life is prolonged; in addition, the flame retardant rubber strip 22 can generate elastic deformation when the door leaf 2 is closed, so that the sealing of the stepped bridge-cut structure 21 is tighter, dense smoke is prevented from permeating through a gap between the door leaf 2 and the door frame 1 when a fire occurs, and the isolation effect on smoke is improved.

According to one embodiment of the invention, the door frame 1 is formed by bonding a perlite fireproof plate 12, a solid wood layer 11 and an aerogel plate 13 which are sequentially arranged from left to right, and a fireproof adhesive layer 14 is arranged on the periphery of the door frame 1. Through the arrangement of the fireproof adhesive layer 14 and the perlite fireproof plate 12, the fire can be better prevented from spreading, and the problem that the door frame 1 is on fire is avoided; the aerogel plate 13 is intended to improve the heat and sound insulation effects.

As an embodiment of the present invention, a storage cavity 25 is provided in the upper portion of the panel 23, the storage cavity 25 is filled with sodium bicarbonate, a vertical pipe 4 is provided in the storage cavity 25, the upper end of the vertical pipe 4 extends to the upper end of the storage cavity 25, the lower end of the vertical pipe 4 is fixed to the lower end of the storage cavity 25, a nozzle 3 communicated with the interior of the lower end of the vertical pipe 4 is provided in the panel 23, the nozzle 3 is horizontally arranged, and the other end of the nozzle extends to the outside of the left side of the panel 23. Because sodium bicarbonate is heated the easy decomposition to begin to decompose gradually at more than 50 ℃ and generate sodium carbonate, carbon dioxide and water, consequently when taking place the condition of a fire, temperature rise in the storage chamber 25, sodium bicarbonate is heated the decomposition, because this decomposition process is the heat absorption process, consequently can reduce the peripheral temperature of door leaf 2, and then delay the spreading of the condition of a fire, the carbon dioxide of its production can be followed spray tube 3 through standpipe 4 and spouted simultaneously, and then keep apart the peripheral air of door leaf 2, build the oxygen deficiency environment and let the fire extinguish, thereby reach better fire-retardant effect.

As an embodiment of the present invention, a sealing plug 41 slidably sealed with the standpipe 4 is arranged in the lower end of the standpipe, and the lower end of the sealing plug 41 is connected with the panel 23 below the standpipe through a spring 42; an insert block 44 is arranged at the upper end of the sealing plug 41, a through hole 45 is arranged in the insert block 44, the through hole 45 penetrates through the sealing plug 41 and extends to the side face of the sealing plug 41, the end part of the through hole is higher than the spray pipe 3, and the through hole 45 can communicate the spray pipe 3 and the vertical pipe 4 when the sealing plug 41 is pressed and moved downwards. Through the setting of sealing plug 41 and spring 42, can make initial time sealing plug 41 block up spray tube 3, both avoid the humid air to get into the problem that leads to the slow decomposition of the interior sodium bicarbonate of storage chamber 25 and inefficacy, can make the pressure increase in the standpipe 4 again for spray tube 3 spun carbon dioxide speed increases, and then increase fire-retardant scope.

In one embodiment of the present invention, a flame-retardant air bag 27 is fixedly provided on the stepped surface of the flame-retardant rubber strip 22, and an air passage 26 communicating the flame-retardant air bag 27 and the upper portion of the storage chamber 25 is provided in the base plate. Through fire-retardant gasbag 27's setting, can make before the blowout carbon dioxide make partial carbon dioxide get into in the fire-retardant gasbag 27 earlier, make its inflation, through hugging closely of gasbag and 1 inner wall of door frame and avoiding taking place the condition of a fire dense smoke from the gap between door leaf 2 and the door frame 1 and permeating through, thereby the isolation effect to the flue gas has been improved, the fire-retardant gasbag 27 of inflation simultaneously can also extrude the flame retardant rubber strip 22 on next door, the mode through increasing pressure makes flame retardant rubber strip 22 sealed more tight, can strengthen the initiative isolation effect of flue gas before the spray tube 3 puts out a fire, further improve the isolation effect to the flue gas.

In one embodiment of the present invention, a leakage-proof net 28 for storing sodium bicarbonate is disposed at a lower portion of the storage chamber 25, the storage chamber 25 below the leakage-proof net 28 forms a storage chamber 29, a bottom of the storage chamber 29 extends into the vertical pipe 4 through a right-angled elbow 43, the right-angled elbow 43 in the vertical pipe 4 extends vertically and downwardly, and the insert 44 is inserted into the right-angled elbow 43 and is in sliding seal with an inner wall of the right-angled elbow 43. Through stock solution chamber 29's setting, can realize the collection of sodium bicarbonate decomposition back water, hydroenergy after the collection can get into in the through-hole 45 through right angle return bend 43, and carry out a period at the decomposition reaction, behind the increase of storage chamber 25 internal pressure, sealing plug 41 moves down makes through-hole 45 and spray tube 3 intercommunication, high pressure environment in the storage chamber 25 this moment can press water into spray tube 3 in, and the water that makes is spout 3 at a high speed from the spray tube, and then carry out the omnidirectional humidification on the surface of panel 23 to door leaf 2, play the effect of cooling or even putting out a fire, consequently, flame retardant efficiency has been improved.

When the door leaf 2 is closed, the inner side face corresponding to the door frame 1 is contacted with the door leaf 2 to form a plurality of annular air faults through the arrangement of the stepped bridge-cut structure 21 and the flame-retardant rubber strips 22, so that the cold bridge effect is avoided, and the heat insulation, sound insulation and environment protection effects are further improved; meanwhile, the flame-retardant rubber strip 22 can reduce the impact of the door leaf 2 on the door frame 1 in the closing process of the door leaf 2, so that the problem that the door frame 1 is damaged due to impact is avoided, and the service life is prolonged; in addition, the flame-retardant rubber strip 22 can generate elastic deformation when the door leaf 2 is closed, so that the sealing at the step-shaped bridge cut-off structure 21 is tighter, dense smoke is prevented from permeating through a gap between the door leaf 2 and the door frame 1 when a fire occurs, and the smoke isolation effect is improved; through the arrangement of the fireproof adhesive layer 14 and the perlite fireproof plate 12, the fire can be better prevented from spreading, and the problem that the door frame 1 is on fire is avoided; the aerogel plate 13 is used for better improving the heat insulation and sound insulation effects; the sodium bicarbonate is easily decomposed by heating and starts to be gradually decomposed at the temperature of more than 50 ℃ to generate sodium carbonate, carbon dioxide and water, so that when a fire occurs, the temperature in the storage cavity 25 rises, the sodium bicarbonate is decomposed by heating, and the decomposition process is a heat absorption process, so that the temperature around the door leaf 2 can be reduced, the spread of the fire is delayed, meanwhile, the generated carbon dioxide can be sprayed out from the spray pipe 3 through the vertical pipe 4, the air around the door leaf 2 is isolated, an anoxic environment is created, the fire is extinguished, and a good flame retardant effect is achieved; through the arrangement of the sealing plug 41 and the spring 42, the sealing plug 41 can block the spray pipe 3 initially, so that the problem that the sodium bicarbonate in the storage cavity 25 is slowly decomposed to lose efficacy due to the entry of humid air is solved, the pressure in the vertical pipe 4 can be increased, the speed of carbon dioxide sprayed out by the spray pipe 3 is increased, and the flame retardant range is enlarged; through the arrangement of the flame-retardant air bag 27, partial carbon dioxide can enter the flame-retardant air bag 27 before the carbon dioxide is sprayed out, the air bag is expanded, dense smoke can be prevented from permeating through a gap between the door leaf 2 and the door frame 1 when a fire occurs due to the fact that the air bag is tightly attached to the inner wall of the door frame 1, the isolation effect on the smoke is improved, meanwhile, the expanded flame-retardant air bag 27 can extrude the flame-retardant rubber strip 22 beside, the flame-retardant rubber strip 22 is sealed more tightly by means of increasing pressure, the active isolation effect on the smoke can be enhanced before the fire is extinguished by the spray pipe 3, and the isolation effect on the smoke is further improved; through stock solution chamber 29's setting, can realize the collection of sodium bicarbonate decomposition back water, hydroenergy after the collection can get into in the through-hole 45 through right angle return bend 43, and carry out a period at the decomposition reaction, behind the increase of storage chamber 25 internal pressure, sealing plug 41 moves down makes through-hole 45 and spray tube 3 intercommunication, high pressure environment in the storage chamber 25 this moment can press water into spray tube 3 in, and the water that makes is spout 3 at a high speed from the spray tube, and then carry out the omnidirectional humidification on the surface of panel 23 to door leaf 2, play the effect of cooling or even putting out a fire, consequently, flame retardant efficiency has been improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The composite wooden door is characterized by comprising a door frame (1), a door leaf (2) and a hinge for connecting the door frame (1) and the door leaf (2); the inner side of the door frame (1) is in a step shape, and the outer side of the door leaf (2) is provided with a step-shaped bridge cut-off structure (21) matched with the door frame (1); flame-retardant rubber strips (22) arranged in the vertical direction are fixedly arranged on each step surface of the step-shaped bridge cut-off structure (21), and the flame-retardant rubber strips (22) can be contacted with the corresponding inner side surface of the door frame (1) when the door leaf (2) is closed and form a plurality of annular air faults; the door leaf (2) is formed by bonding a panel (23) and a wood base plate (24), and the panel (23) is positioned on the left side of the wood base plate (24).

2. The composite wood door according to claim 1, wherein the door frame (1) is formed by bonding a perlite fireproof plate (12), a solid wood layer (11) and an aerogel plate (13) which are sequentially arranged from left to right, and a fireproof adhesive layer (14) is arranged on the periphery of the door frame (1).

3. The composite wood door according to claim 2, wherein a storage cavity (25) is formed in the upper portion of the panel (23), sodium bicarbonate is filled in the storage cavity (25), a vertical pipe (4) is vertically arranged in the storage cavity (25), the upper end of the vertical pipe (4) extends to the upper end of the storage cavity (25), the lower end of the vertical pipe (4) is fixed at the lower end of the storage cavity (25), a spray pipe (3) communicated with the lower end of the vertical pipe (4) is formed in the panel (23), the spray pipe (3) is horizontally arranged, and the other end of the spray pipe extends to the outside of the left side of the panel (23).

4. A composite wood door according to claim 3, characterized in that a sealing plug (41) which is in sliding sealing with the standpipe (4) is arranged in the lower end of the standpipe, and the lower end of the sealing plug (41) is connected with a panel (23) below the sealing plug through a spring (42); the sealing plug (41) upper end is provided with inserted block (44), be provided with through-hole (45) in inserted block (44), through-hole (45) pass sealing plug (41) and extend to sealing plug (41) side and its tip is higher than spray tube (3) and arranges, through-hole (45) can communicate spray tube (3) and standpipe (4) when sealing plug (41) pressurized moves down.

5. The composite wood door according to claim 4, wherein a flame-retardant air bag (27) is fixedly arranged on the stepped surface at one side of the flame-retardant rubber strip (22), and an air passing channel (26) communicated with the upper parts of the flame-retardant air bag (27) and the storage cavity (25) is arranged in the base plate.

6. The composite wood door according to claim 5, wherein a leakage-proof net (28) for storing sodium bicarbonate is arranged at the lower part in the storage cavity (25), the storage cavity (25) below the leakage-proof net (28) forms a liquid storage cavity (29), the bottom of the liquid storage cavity (29) extends into the vertical pipe (4) through a right-angled elbow (43), the right-angled elbow (43) in the vertical pipe (4) extends vertically downwards, and the insertion block (44) is inserted into the right-angled elbow (43) and is in sliding sealing with the inner wall of the right-angled elbow (43).