DE102019216456A1 - Mixing body - Google Patents

Abstract

The invention relates to a mixing body for supplying a cooling medium and an atomizing medium into a mixing chamber of a two-medium spray nozzle. The mixing body is formed in one piece and has a first channel for the cooling medium. The mixing body 100 according to the invention also has a second channel 120 for the atomizing medium. The first and the second channel 110, 120 are each non-coaxial in the form of separate pipe sections 112, 122 on the inlet side, and the second channel 120 is annular and coaxial around the first channel 110 on the outlet side of the mixing body.

Description

The invention relates to a mixing body for use in a spray nozzle, which is also the subject of the present invention. The mixing body is used to supply a cooling medium and an atomizing medium into a mixing chamber of the spray nozzle, which is designed as a two-medium spray nozzle. The spray nozzle is used to apply a mixture of the cooling and atomizing medium to an object to be cooled, in particular a warm metal product in a steel mill. The invention further relates to a method for producing the mixing body and at least parts of the spray nozzle.

A mixing body is basically known in the prior art, for example from the German patent application DE 102 00 662 A1 . The mixing body disclosed there forms the outlet-side end of a first channel for a cooling medium within a two-medium spray nozzle. With the help of the mixing body, the cooling medium is deflected radially outward into a second channel which carries an atomizing medium. The second channel also forms a mixing chamber at the same time because the actual mixing of the cooling medium with the atomizing medium takes place there. The second channel is routed around the outside of the mixing body.

The invention has for its object to provide an alternative embodiment for a mixing body for use in a spray nozzle, the spray nozzle with the alternative mixing body and a simplified method for its production.

This object is achieved with respect to the mixing body by the subject matter of claim 1. This is characterized in that a second channel for the atomizing medium is also formed in the mixing body, that the first and second channels are each non-coaxial in the form of separate pipeline sections on the inlet side and that the second channel on the outlet side of the mixing body is annular and coaxial around the is formed around the first channel.

The claimed design of not only the first but also the second channel within the mixing body offers the advantage that the mixing body no longer has to be screwed to an inner tube within a spray nozzle and combined with an outer tube in order to achieve atomization, as in State of the art was required in part. In this respect, the assembly effort is made considerably easier by the claimed double ducting within the mixing body. The assembly effort is further facilitated by the fact that the first and the second channel are non-coaxial in the form of separate pipeline sections on the inlet side. This makes it possible to connect separate pipes to the first and second channels of the mixing body; in particular, the pipes do not have to be fed to the mixing body according to the invention in a coaxial manner on the input side. The characteristic, which is further claimed, according to which the second channel on the outlet side of the mixing body is designed to be annular and coaxial to the first channel, ensures optimum atomization and mixing of the mixture to be generated from the cooling medium and the atomizing medium.

Finally, it is advantageous that the mixer is made in one piece; this makes it possible, for example, very easily and inexpensively z. B. in 3-D printing process.

Preferably, the first channel and the second channel are formed within the mixing body on the outlet side, forming a tear-off edge with a preferably acute angle tapering towards one another. Using the tear-off edge, this channel guide leads to an optimal mixing of the cooling medium and the atomizing medium in a mixing chamber of the spray nozzle which adjoins the mixing body in the direction of flow. In particular, in order to design the first channel for the cooling medium, which is guided centrally on the outlet side, with a component curved radially outward toward the second channel and towards the tear-off edge, a flow divider element is provided according to the invention, which is inserted into the first channel on the outlet side. This flow divider element is supported on the wall of the first channel by means of radially extending webs and serves to divide the flow of the cooling medium into a plurality of individual flows, each with a cross-section in the form of a ring segment.

According to a further exemplary embodiment, the second channel for the atomizing medium has a smaller opening cross section for the atomizing medium at least on its outlet side in the mixing body than on its inlet side. In this way, the atomizing medium is accelerated before it emerges from the mixing body and before it meets the cooling medium, which likewise contributes to improving the mixing with the cooling medium.

With regard to the spray nozzle, the above object of the invention is achieved by the subject matter of claim 9. The advantages of this solution correspond to the advantages mentioned above with reference to the mixing body claimed.

The above object is achieved with respect to the method by claim 12. Accordingly, the mixing body according to the invention is advantageously with a generative manufacturing process, for. B. in 3-D printing process. The generative manufacturing processes enable the mixing body to be manufactured not only from metal, but alternatively also from a hybrid material, e.g. B. a compound of metal and plastic.

Further advantageous embodiments of the mixing body according to the invention and the spray nozzle according to the invention are the subject of the dependent claims.

• 1 einen Querschnitt durch den erfindungsgemäßen Mischkörper;
• 2 das auslaufseitige Ende des Mischkörpers;
• 3 zwei perspektivische Außenansichten des Mischkörpers;
• 4 die erfindungsgemäße Spritzdüse in einem Querschnitt; und
• 5 die erfindungsgemäße Spritzdüse in einer Gesamtansicht

zeigt.The description is accompanied by five figures

• 1 a cross section through the mixing body according to the invention;
• 2nd the outlet end of the mixing body;
• 3rd two perspective external views of the mixing body;
• 4th the spray nozzle according to the invention in a cross section; and
• 5 the spray nozzle according to the invention in an overall view

shows.

The invention is described in detail below with reference to the figures mentioned in the form of exemplary embodiments. The same technical elements are denoted by the same reference symbols in all the figures.

1 shows the mixing body according to the invention 100 in a cross-sectional representation. In the mixing body 100 two channels are formed, a first channel 110 for guiding a cooling medium and a second channel 120 for guiding an atomizing medium. The flow direction for these media are in 1 marked with input arrows. The peculiarity of this mixing body is that the first and the second channel 110 , 120 on the inlet side in the form of separate pipe sections 112 , 122 are non-coaxial and that the second channel 120 outlet side of the mixing body 100 is annular and coaxial around the first channel. The first channel 110 is centrally or axially guided in the mixing body on the outlet side.

The mixing body 100 is formed in one piece. It is preferably with a generative manufacturing process such. B. the 3-D printing process. The generative manufacturing processes enable the mixing body to be made from metal or from a hybrid material, e.g. B. a compound of metal and plastic.

The two pipe sections are on the inlet side 112 , 122 for the first channel 110 and the second channel 120 Arranged and formed at least in sections or sections parallel or skewed to one another.

The first channel is on the outlet side 110 and the second channel 120 forming a tear-off edge 114 with a preferably acute angle α or an angle of α = 90 ° running towards each other. As in 1 can be seen is the first channel 110 on the outlet side at least with one component in the radial direction outwards onto the second channel 120 and on the tear-off edge 114 formed curved. The second channel is analog 120 at least with one component in the radial direction r inside on the first channel 110 and on the tear-off edge 114 formed curved. As in 1 you can see the tear-off edge 114 at the outlet end of the wall 116 of the first channel 110 educated. In the first channel 110 is a flow divider element on the outlet side 118 arranged.

The second channel 120 preferably has a smaller opening cross-section at least on its outlet side 121 for the atomizing medium than on its inlet side. This narrowing of the cross section advantageously brings about an acceleration of the atomizing medium before it emerges from the mixing body and thus an improved mixing with the cooling medium.

2nd indicates that the flow divider element 118 over radially extending webs 119 on the outer wall 116 of the first channel 110 is supported. The bridges 119 effect a division of the flow of the cooling medium on the outlet side of the mixing body into a plurality of individual flows, each with a cross-section in the form of a ring segment.

The bridges 119 of the flow divider element 118 can be in the radial direction r additionally through the annular second channel 120 extend through. Then, as in 2nd also illustrates a division of the outlet opening of the second channel 120 and thus the flow of the atomizing medium into a plurality of ring segment-shaped sections or individual flows with a ring segment cross section.

3rd shows two perspective external views of the mixing body according to the invention 100 . In particular, the two pipeline sections on the inlet side are clearly visible 112 , 122 for connecting a pipe for the coolant of a pipe for the atomizing medium.

4th shows the spray nozzle according to the invention 200 in a cross-sectional view. The spray nozzle is used to spray a two-medium mixture onto an object, in particular a warm metal product, in particular a slab in a steel mill.

The spray nozzle 200 has an attachment block on the input side 210 on with input connections 212 and through holes (in 4th not recognizable) for a first channel for the cooling medium and for a second channel for the atomizing medium. To the through holes in the mounting block 210 are a first pipe on the outlet side 122 as an extension of the first channel for the cooling medium and a second pipe 224 connected as an extension of the second channel for the atomizing medium. On her the extension block 210 the opposite ends are the first and the second pipeline to the pipeline sections 112 , 122 of the mixing body according to the invention 100 connected. The mixing body is on the outlet side 100 on a mouthpiece 230 the spray nozzle 200 connected. The mouthpiece is cup-shaped and on the outlet side of the mixing body 100 open towards. The one from the cup-shaped mouthpiece 230 spanned interior forms the mixing chamber 240 the spray nozzle 200 . The mouthpiece 230 can be connected directly or indirectly to the output side of the mixing body. In contrast to a direct connection, an indirect connection means that between the output side of the mixing body 100 and the input side of the mouthpiece has a spacer sleeve 250 is switched to enlarge the mixing chamber 240 .

The mixing body is preferably 100 and the mouthpiece 230 and optionally also the spacer 250 integrally formed. All of these components are then manufactured individually or in combination, for example using the generative manufacturing process mentioned above.

5 finally shows the spray nozzle 200 with the mixing body according to the invention 100 in a perspective overall view.

Reference list

100

Mixing body

110

first channel

112

(First) pipe section for cooling medium

114

Tear-off edge

116

Wall of the first channel

118

Flow divider element

119

web

120

second channel

121

reduced cross section of the second channel

122

(Second) pipe section for atomizing medium

200

Spray nozzle

210

Mounting block

212

Input connections

222

first pipeline

224

second pipeline

230

Mouthpiece

240

Mixing chamber

250

Spacer sleeve

r

radial direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of documents listed by the applicant has been generated automatically and is only included for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 10200662 A1 [0002]

Claims (13)

Mixing body (100) for feeding a cooling medium and an atomizing medium into a mixing chamber (240) of a two-medium spray nozzle (200), the mixing body being formed in one piece and having a first channel (110) for the cooling medium; characterized in that a second channel (120) for the atomizing medium is also formed in the mixing body (100); that the first and second channels (110, 120) are each non-coaxial in the form of separate pipeline sections on the inlet side; and that the second channel (120) on the outlet side of the mixing body (100) is configured in a ring shape and is guided coaxially around the first channel (100). Mixing body (100) after Claim 1 , characterized in that the two pipe sections (112, 122) are arranged and formed at least in regions parallel or skewed to one another on the inlet side. Mixing body (100) according to one of the preceding claims, characterized in that the first channel and the second channel (110, 120) are formed on the outlet side with the formation of a tear-off edge (114) with a preferably acute angle converging towards one another. Mixing body (100) after Claim 3 , characterized in that the first channel (110) is curved on the outlet side with at least one component in the radial direction (r) outwardly towards the second channel (120) and towards the tear-off edge (114); and that the second channel (120) is formed with at least one component in the radial direction (r) inward toward the first channel and towards the tear-off edge (114). Mixing body (100) after Claim 3 or 4th , characterized in that the tear-off edge (114) is formed on the outlet-side end of the wall (116) of the first channel. Mixing body (100) according to one of the preceding claims, characterized by a flow divider element (118) arranged on the outlet side in the first channel (110), which is supported on the wall (116) of the first channel by means of radially extending webs (119) Flow of the cooling medium in a plurality of individual flows, each with a cross-section in the form of a ring segment. Mixing body (100) after Claim 6 , characterized in that the webs (119) of the flow divider element (118) also extend in the radial direction through the ring-shaped second channel for dividing the flow of the atomizing medium into a plurality of individual flows, each with a ring-segment-shaped cross-section. Mixing body (100) according to one of the preceding claims, characterized in that the second channel (120) has a smaller opening cross-section (121) for the atomizing medium at least on its outlet side than on its inlet side. Spray nozzle (200) for spraying a 2-medium mixture onto an object, in particular a warm metal product, comprising: a mounting block (210) with input connections (212) and through holes for a first channel for a cooling medium and for a second channel for an atomizing medium ; first and second conduits (222, 224) connected to the exit sides of the through holes in the mounting block for the first and second channels; the mixing body (100) according to one of the Claims 1 to 8th , which is connected with its inlet-side pipe sections to the ends of the mounting block (210) facing away from the first and second pipes (222, 224); and a mouthpiece (230) which is cup-shaped and is open to the outlet side of the mixing body (100) and is connected there directly or indirectly, the interior spanned by the cup-shaped mouthpiece forming the mixing chamber (240) of the spray nozzle. Spray nozzle after Claim 9 , characterized by a spacer sleeve (250) as an indirect connection between the outlet side of the mixing body (100) and the mouthpiece (230) to enlarge the mixing chamber (240). Spray nozzle after Claim 9 or 10th , characterized in that the mixing body (100) and the mouthpiece (230) and optionally also the spacer (250) are formed individually or in one piece. Method for producing the mixing body (100) according to one of the Claims 1 to 8th or of at least parts of the spray nozzle according to one of the Claims 9 to 11 , characterized in that the mixing body (100) and / or the mouthpiece (230) individually or in combination also optionally with the spacer (250) is produced using a generative manufacturing process. Procedure according to Claim 12 , characterized in that the mixing body (100) and / or the mouthpiece (230) and / or the spacer (250) made of metal or a hybrid material, e.g. B. Metal is made in connection with plastic.

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