WO2009147280A1 - A nozzle box meant for cooling of a glass - Google Patents

A nozzle box meant for cooling of a glass Download PDF

Info

Publication number
WO2009147280A1
WO2009147280A1 PCT/FI2009/000057 FI2009000057W WO2009147280A1 WO 2009147280 A1 WO2009147280 A1 WO 2009147280A1 FI 2009000057 W FI2009000057 W FI 2009000057W WO 2009147280 A1 WO2009147280 A1 WO 2009147280A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
nozzles
lid
glass
grooves
Prior art date
Application number
PCT/FI2009/000057
Other languages
French (fr)
Inventor
Risto Nikander
Juha Paavola
Original Assignee
Finntemp Oy
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Finntemp Oy filed Critical Finntemp Oy
Publication of WO2009147280A1 publication Critical patent/WO2009147280A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/20—Arrangements of several outlets along elongated bodies, e.g. perforated pipes or troughs, e.g. spray booms; Outlet elements therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/0404—Nozzles, blow heads, blowing units or their arrangements, specially adapted for flat or bent glass sheets
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/0404—Nozzles, blow heads, blowing units or their arrangements, specially adapted for flat or bent glass sheets
    • C03B27/0408—Nozzles, blow heads, blowing units or their arrangements, specially adapted for flat or bent glass sheets being dismountable
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B27/00—Tempering or quenching glass products
    • C03B27/04—Tempering or quenching glass products using gas
    • C03B27/044—Tempering or quenching glass products using gas for flat or bent glass sheets being in a horizontal position

Definitions

  • Invention relates to an elongated nozzle box meant for cooling surfaces, such as hot glass surfaces with air blowing from which nozzle box cooling air is arranged to burst out onto at least one surface of the box, such as from the nozzles located at a nozzle lid.
  • Hardening and cooling by means of air is often used; in the hardening of glass almost only air hardening is used in various ways. Nozzles with the right design are important to achieve a good operating efficiency. There are a lot of various known examples of these.
  • the nozzle group for glass bending and hardening forms a particularly difficult area because in addition to the usual requirements belonging to the hardening, the nozzles should follow the form of the glass very well being at the right distance away from the glass. In addition to that hardening of the glass should be performed with the right "hit figure" - in other words the air jets coming from the nozzles should face the glass with a regular and desired geometry. If one wants to harden the glass bent to a complex form fully with an optimum nozzle group, then so called blast head should be manufactured separately for each glass. This would be particularly expensive to do.
  • One additional requirement for an efficient and energy friendly hardening would be the fact that the air needs to be able to be removed from the hardening chamber as freely as possible so that the counter pressure causing waste of energy would not be generated.
  • adjustable hardening nozzle groups have been developed which hardening nozzle groups can be adjusted to have a bending form of the glass with a sufficient accuracy according to the above mentioned requirements. So with one well- planned, adjustable hardening nozzle group most glasses being on the market can be hardened according to the standards. Ways of implementation that make technical sense have led to the fact that adjustability can be performed with separate nozzle boxes from one side of which (from the nozzle lid) air flows out through the nozzles towards the glass while hardening and cooling the glass.
  • the nozzle lid is usually about 100 mm wide so that it would function in the best possible way. A large amount of nozzles with the right direction and a good operating efficiency should be able to be attached to the nozzle lids.
  • Nozzles with the right form have been drilled to an aluminum lid from which nozzles air bursts out from the even surface of the lid.
  • this even surface is however a convex surface in relation to the cross section of the nozzle box to which surface the nozzles have been machined in direction of the radius.
  • Pipe nozzles that have the right form and are manufactured to be located at the nozzle lid of the nozzle box whereupon holes need to be manufactured for the pipe nozzles at the nozzle Hd and the pipe nozzles need to be attached to them. Also the pipe nozzles have been attached onto the convex surface of the nozzle lid, the pipe nozzles being in the middle of the nozzle Hd in a radial way being directed perpendicularly onto the surface of the glass, the pipe nozzles being at the sides somewhat diagonally towards the glass.
  • the disadvantage of the nozzles that are machined to the aluminum Hd is the fact that air bursts out of the holes of the level which bursting causes turbulence and loss of energy around a nozzle hole. For the same reason a throw-out phenomenon that helps in the cooling process cannot be achieved.
  • a third point that causes problems in this kind of nozzle Hd is the fact that the air that flows out causes flows from the mid line of the nozzle Hd towards the sides and hardening air, which bursts out from the nozzles located at the sides of the nozzle Hd, gets hit first to the air flowing sideways whereupon the hit of the air jet to the glass declines thus lowering the hardening capacity.
  • This kind of nozzle Hd is still wide so that it makes air holes smaller through which the air can be let out from a hardening chamber.
  • the disadvantage of the pipe nozzles is their production technical difficulty, to direct them in such a way that nozzle jets would encounter the glass absolutely in the right, geometrical figure. Regarding costs, this kind of nozzle Hd is relatively expensive to manufacture.
  • the pipe nozzles can also become easily damaged wh ⁇ n an external force affects them. If a glass becomes damaged when it is being hardened, then a broken glass easily stays between the pipe nozzles and it is difficult to get it out of there.
  • the removal of air from a hardening chamber is not controlled, the air to be removed is directed to various directions from the nozzles whereto it has the easiest access.
  • the nozzle Hd is implemented according to the method of the present invention of which method it is characteristic that at least grooves and ridges have been adjusted to the mentioned nozzle lid and a row of nozzles has been adjusted to the ridges and the mentioned grooves and ridges are located in a crosswise direction in relation to the longitudinal direction of the nozzle lid.
  • the advantage of the invention is the fact that this arrangement reduces the losses around the nozzle hole caused by the turbulence of air due to the structure on the strength of which the throw-out phenomenon can be realized at least partly, in other words the nozzle jets takes with it the air next to it around the bursting point in a controlled way.
  • the air being removed from the surface of the glass is directed to the grooves and is removed also along the crosswise grooves to the sides of the nozzle boxes and is removed from between the nozzle boxes totally away from the hardening chamber in a controlled way.
  • the air being removed in this way does not cause any damage to the hit of air caused by the nozzles located at the sides of the mid-line of the nozzle boxes to the glass and the hardening capacity does not become weaker in relation to the nozzles located at the sides.
  • Figure 1 shows the nozzle lid diagonally seen.
  • Figure 2 shows a cut in direction B - B from the nozzle lid.
  • Figure 3 shows a cut in direction A - A from the nozzle lid.
  • Figure 4 shows another embodiment of the nozzle lid shown from the blowing direction.
  • Figure 5 shows a partial enlargement of the figure 4.
  • Figure 6 shows a cut C - C of the figure 4.
  • Figure 7 shows a cut D - D of the figure 4.
  • Figure 8 shows the end piece of the nozzle box.
  • the nozzle lid 1 in the figure 1 is made of solid material and a bottom and edges belong to it. The edges have holes 2 and a shoulder 10 for the attachment of the lid.
  • the bottom part comprises nozzle holes 4 drilled to it.
  • the blowing side of the nozzle Hd 1 comprises ridges 8 and grooves 7 on its surface. The grooves 7 causing the waves of the surface of the blowing side can be implemented by casting or machining for a relatively cheap price.
  • the nozzle holes 4 that have been machined to the ridges 8 are as easy to implement by drilling as the nozzle holes that are machined to the even nozzle lids.
  • ridges 8 are not prone to damage.
  • Crosswise grooves 7 and ridges 8 remove the potentially broken glass from the hardening chamber well because the granules of the glass move in the grooves 7 along air turbulence to the sides of the nozzle boxes and out of them. This happens especially when the nozzle Hd is underneath the glass and the bottom of the nozzle lid 1 is then directed upwards - in other words towards the base of the glass.
  • outlines 3 of the nozzle holes can be seen in relation to the casting of the nozzle lid. From these stages one continues by drilling the nozzle hole 4 to each place.
  • a piped aluminum profile can also function as an outline of the Hd.
  • the blowing distance h from the nozzles located at the sides of the nozzle Hd 1 to the glass 6 is longer than from the nozzles located in the middle, this can be seen for example in the figure 2. Therefore similar nozzles 4 around the edges of the nozzle lids which nozzles have at least the same diameter cool the glass 6 a little bit less effectively at the sides than in the middle.
  • This lowering of cooling power due to increase in blowing distance can be compensated by machining the nozzles 4 located at the edges to have a bit bigger diameter in the method according to the invention - if needed - and like it is possible to do with the holes that have been machined onto the even nozzle Hd.
  • a hit sector of one edge nozzle 4 is described with the reference number 5. With pipe nozzles this would instead cause problems, especially increase in costs because it would require nozzles with diameters in various sizes and changes in the way they have been attached. The changes in the machining of the diameter are easier to control.
  • - crosswise grooves 7 have not been machined from one edge of the Hd to another edge.
  • a wave-like groove 9 has been machined in this longitudinal ridge in such a way that it circles the nozzles 4 in the area of the ridge by turns on both sides, like the figure 5 shows more detailed.
  • the figure 7 shows also the location of the groove 9 in relation to the nozzles 4.
  • a soft, heat-resistant thread can be attached to the groove against which the glass can be blown after the hardening without causing danger in breaking or getting damaged in relation to the glass.
  • the adjustability of the blowing zone is known in relation to the hardening nozzle group that can be adjusted in shape - in other words entry of the air is blocked to such nozzle boxes for which no air is needed for the hardening of the glass.
  • the blowing is cut in an air distribution centre.
  • a hole 12 leading through the piece has been manufactured to the end piece 11 of the nozzle lid 1 according to the invention through which a moveable closing flap can be pushed in order to block the nozzles 4.

Abstract

An elongated nozzle box meant for cooling surfaces, such as hot glass surfaces (6) with the help of air blowing from which nozzle box the cooling air has been arranged to be burst out onto at least one surface, such as from the nozzles (4) located on a nozzle lid (1). At least grooves (7) and ridges (8) are adjusted onto the mentioned nozzle lid (1) and a row of nozzles (4) is adjusted to the ridges (8) and the mentioned grooves (7) and ridges (8) are in crosswise direction in relation to the longitudinal direction of the nozzle lid (1).

Description

A NOZZLE BOX MEANT FOR COOLING OF A GLASS
Invention relates to an elongated nozzle box meant for cooling surfaces, such as hot glass surfaces with air blowing from which nozzle box cooling air is arranged to burst out onto at least one surface of the box, such as from the nozzles located at a nozzle lid. Hardening and cooling by means of air is often used; in the hardening of glass almost only air hardening is used in various ways. Nozzles with the right design are important to achieve a good operating efficiency. There are a lot of various known examples of these.
The nozzle group for glass bending and hardening forms a particularly difficult area because in addition to the usual requirements belonging to the hardening, the nozzles should follow the form of the glass very well being at the right distance away from the glass. In addition to that hardening of the glass should be performed with the right "hit figure" - in other words the air jets coming from the nozzles should face the glass with a regular and desired geometry. If one wants to harden the glass bent to a complex form fully with an optimum nozzle group, then so called blast head should be manufactured separately for each glass. This would be particularly expensive to do. One additional requirement for an efficient and energy friendly hardening would be the fact that the air needs to be able to be removed from the hardening chamber as freely as possible so that the counter pressure causing waste of energy would not be generated.
For the above mentioned reasons adjustable hardening nozzle groups have been developed which hardening nozzle groups can be adjusted to have a bending form of the glass with a sufficient accuracy according to the above mentioned requirements. So with one well- planned, adjustable hardening nozzle group most glasses being on the market can be hardened according to the standards. Ways of implementation that make technical sense have led to the fact that adjustability can be performed with separate nozzle boxes from one side of which (from the nozzle lid) air flows out through the nozzles towards the glass while hardening and cooling the glass. The nozzle lid is usually about 100 mm wide so that it would function in the best possible way. A large amount of nozzles with the right direction and a good operating efficiency should be able to be attached to the nozzle lids. Mainly two nozzle solutions are used: 1. Nozzles with the right form have been drilled to an aluminum lid from which nozzles air bursts out from the even surface of the lid. In practice this even surface is however a convex surface in relation to the cross section of the nozzle box to which surface the nozzles have been machined in direction of the radius.
2. Pipe nozzles that have the right form and are manufactured to be located at the nozzle lid of the nozzle box whereupon holes need to be manufactured for the pipe nozzles at the nozzle Hd and the pipe nozzles need to be attached to them. Also the pipe nozzles have been attached onto the convex surface of the nozzle lid, the pipe nozzles being in the middle of the nozzle Hd in a radial way being directed perpendicularly onto the surface of the glass, the pipe nozzles being at the sides somewhat diagonally towards the glass.
Although the both have in principle a good operating efficiency thinking about the mere nozzle, they also have their disadvantages in this kind of application.
1. The disadvantage of the nozzles that are machined to the aluminum Hd is the fact that air bursts out of the holes of the level which bursting causes turbulence and loss of energy around a nozzle hole. For the same reason a throw-out phenomenon that helps in the cooling process cannot be achieved. A third point that causes problems in this kind of nozzle Hd is the fact that the air that flows out causes flows from the mid line of the nozzle Hd towards the sides and hardening air, which bursts out from the nozzles located at the sides of the nozzle Hd, gets hit first to the air flowing sideways whereupon the hit of the air jet to the glass declines thus lowering the hardening capacity. This kind of nozzle Hd is still wide so that it makes air holes smaller through which the air can be let out from a hardening chamber.
2. The disadvantage of the pipe nozzles is their production technical difficulty, to direct them in such a way that nozzle jets would encounter the glass absolutely in the right, geometrical figure. Regarding costs, this kind of nozzle Hd is relatively expensive to manufacture. The pipe nozzles can also become easily damaged whέn an external force affects them. If a glass becomes damaged when it is being hardened, then a broken glass easily stays between the pipe nozzles and it is difficult to get it out of there. The removal of air from a hardening chamber is not controlled, the air to be removed is directed to various directions from the nozzles whereto it has the easiest access.
In order to reduce the above mentioned disadvantages and in order to optimize the advantages of the both, mentioned structures, the nozzle Hd is implemented according to the method of the present invention of which method it is characteristic that at least grooves and ridges have been adjusted to the mentioned nozzle lid and a row of nozzles has been adjusted to the ridges and the mentioned grooves and ridges are located in a crosswise direction in relation to the longitudinal direction of the nozzle lid.
The advantage of the invention is the fact that this arrangement reduces the losses around the nozzle hole caused by the turbulence of air due to the structure on the strength of which the throw-out phenomenon can be realized at least partly, in other words the nozzle jets takes with it the air next to it around the bursting point in a controlled way. The air being removed from the surface of the glass is directed to the grooves and is removed also along the crosswise grooves to the sides of the nozzle boxes and is removed from between the nozzle boxes totally away from the hardening chamber in a controlled way. The air being removed in this way does not cause any damage to the hit of air caused by the nozzles located at the sides of the mid-line of the nozzle boxes to the glass and the hardening capacity does not become weaker in relation to the nozzles located at the sides.
In the following the invention is described in a more detailed way by referring to the accompanying drawing in which: Figure 1 shows the nozzle lid diagonally seen.
Figure 2 shows a cut in direction B - B from the nozzle lid.
Figure 3 shows a cut in direction A - A from the nozzle lid.
Figure 4 shows another embodiment of the nozzle lid shown from the blowing direction.
Figure 5 shows a partial enlargement of the figure 4. Figure 6 shows a cut C - C of the figure 4.
Figure 7 shows a cut D - D of the figure 4.
Figure 8 shows the end piece of the nozzle box. The nozzle lid 1 in the figure 1 is made of solid material and a bottom and edges belong to it. The edges have holes 2 and a shoulder 10 for the attachment of the lid. The bottom part comprises nozzle holes 4 drilled to it. The blowing side of the nozzle Hd 1 comprises ridges 8 and grooves 7 on its surface. The grooves 7 causing the waves of the surface of the blowing side can be implemented by casting or machining for a relatively cheap price. The nozzle holes 4 that have been machined to the ridges 8 are as easy to implement by drilling as the nozzle holes that are machined to the even nozzle lids.
It is clear from the figure 3 that ridges 8 are not prone to damage. Crosswise grooves 7 and ridges 8 remove the potentially broken glass from the hardening chamber well because the granules of the glass move in the grooves 7 along air turbulence to the sides of the nozzle boxes and out of them. This happens especially when the nozzle Hd is underneath the glass and the bottom of the nozzle lid 1 is then directed upwards - in other words towards the base of the glass. In the figure 3 outlines 3 of the nozzle holes can be seen in relation to the casting of the nozzle lid. From these stages one continues by drilling the nozzle hole 4 to each place. For example a piped aluminum profile can also function as an outline of the Hd.
The blowing distance h from the nozzles located at the sides of the nozzle Hd 1 to the glass 6 is longer than from the nozzles located in the middle, this can be seen for example in the figure 2. Therefore similar nozzles 4 around the edges of the nozzle lids which nozzles have at least the same diameter cool the glass 6 a little bit less effectively at the sides than in the middle. This lowering of cooling power due to increase in blowing distance can be compensated by machining the nozzles 4 located at the edges to have a bit bigger diameter in the method according to the invention - if needed - and like it is possible to do with the holes that have been machined onto the even nozzle Hd. A hit sector of one edge nozzle 4 is described with the reference number 5. With pipe nozzles this would instead cause problems, especially increase in costs because it would require nozzles with diameters in various sizes and changes in the way they have been attached. The changes in the machining of the diameter are easier to control.
There is a nozzle Hd 1 in the figure 4 at the mid line L of which nozzle Hd a longitudinal ridge has been left according to the figure 6. In other words - crosswise grooves 7 have not been machined from one edge of the Hd to another edge. In addition to that a wave-like groove 9 has been machined in this longitudinal ridge in such a way that it circles the nozzles 4 in the area of the ridge by turns on both sides, like the figure 5 shows more detailed. With the help of the longitudinal ridge there will be more stiffness for the nozzle lid 1. The figure 7 shows also the location of the groove 9 in relation to the nozzles 4. A soft, heat-resistant thread can be attached to the groove against which the glass can be blown after the hardening without causing danger in breaking or getting damaged in relation to the glass.
The adjustability of the blowing zone is known in relation to the hardening nozzle group that can be adjusted in shape - in other words entry of the air is blocked to such nozzle boxes for which no air is needed for the hardening of the glass. In the known methods the blowing is cut in an air distribution centre. In addition to this it is also known to block a part of the length of the nozzle box with the help of a closing flap installed to the nozzle box. It is advantageous to block the whole length or the selected length of the nozzle box with the help of the closing flap that can be set to the nozzle box whereupon no separate closing flap needs to be manufactured for the air distribution centre. With this method it is possible to block also the desired length of length of the nozzle box. A hole 12 leading through the piece has been manufactured to the end piece 11 of the nozzle lid 1 according to the invention through which a moveable closing flap can be pushed in order to block the nozzles 4.

Claims

1. An elongated nozzle box meant for cooling surfaces, such as hot glass surfaces (6) with the help of air blowing from which nozzle box the cooling air has been arranged to be burst out onto at least one surface, such as from the nozzles (4) located on a nozzle lid (1), characterized in that at least grooves (7) and ridges (8) are adjusted onto the mentioned nozzle lid (1) and a row of nozzles (4) is adjusted to the ridges (8) and the mentioned grooves (7) and ridges (8) are in crosswise direction in relation to the longitudinal direction of the nozzle lid (1).
2. Nozzle box according to claim 1, characterized in that the grooves (7) are adjusted to be directed from one edge of the nozzle lid (1) to another edge.
3. Nozzle box according to claim 1, characterized in that the nozzle lid (1) has a solid structure and the crosswise grooves (7) in it are formed either by casting or by machining.
4. Nozzle box according to claim 1, characterized in that there is a ridge at the mid line (L) of the nozzle Hd (1) in longitudinal direction in relation to the nozzle Hd the surface of which is essentially at the level of the crosswise grooves (8).
5. Nozzle box according to claim 1, characterized in that the longitudinal directed ridge comprises a groove (9) that proceeds along the ridge to which groove a heat-resistant thread, which protrudes a bit from the surface of the nozzle Hd, can be adjusted.
6. Nozzle box according to claim 1, characterized in that a part of its nozzles (4) or all the nozzles can be blocked with the help of a closing flap that can be pushed to the nozzle Hd (1) whereupon the flap can be pushed to cover a part of the length of the nozzle box or the whole length.
PCT/FI2009/000057 2008-06-05 2009-06-04 A nozzle box meant for cooling of a glass WO2009147280A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20080391A FI20080391L (en) 2008-06-05 2008-06-05 Nozzle body intended for cooling glass
FI20080391 2008-06-05

Publications (1)

Publication Number Publication Date
WO2009147280A1 true WO2009147280A1 (en) 2009-12-10

Family

ID=39589267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2009/000057 WO2009147280A1 (en) 2008-06-05 2009-06-04 A nozzle box meant for cooling of a glass

Country Status (2)

Country Link
FI (1) FI20080391L (en)
WO (1) WO2009147280A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107864651A (en) * 2016-07-21 2018-03-30 法国圣戈班玻璃厂 Nozzle strip for the bellows of the pre-add thermal stress of glass disc

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4816058A (en) * 1986-04-16 1989-03-28 Saint-Gobain Vitrage "Les Miroirs" Blow box for glass tempering
WO2003101898A1 (en) * 2002-05-30 2003-12-11 Feracitas Oy Method for cooling the glass sheet
US20060191292A1 (en) * 2003-03-28 2006-08-31 Pilkington Plc Tempering bent glass sheets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4816058A (en) * 1986-04-16 1989-03-28 Saint-Gobain Vitrage "Les Miroirs" Blow box for glass tempering
WO2003101898A1 (en) * 2002-05-30 2003-12-11 Feracitas Oy Method for cooling the glass sheet
US20060191292A1 (en) * 2003-03-28 2006-08-31 Pilkington Plc Tempering bent glass sheets

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107864651A (en) * 2016-07-21 2018-03-30 法国圣戈班玻璃厂 Nozzle strip for the bellows of the pre-add thermal stress of glass disc
US11702357B2 (en) 2016-07-21 2023-07-18 Saint-Gobain Glass France Nozzle strip for a blow box for thermally prestressing glass panes

Also Published As

Publication number Publication date
FI20080391A0 (en) 2008-06-05
FI20080391L (en) 2009-12-06

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