Dual-substance nozzle, spray head, and method

Abstract

In order to provide a dual-substance nozzle (30) for atomizing a mixture of an atomizing medium and atomizing air, the dual-substance nozzle (30) being connected to at least one feed channel (40) through which the mixture or the atomizing medium can be fed to the dual-substance nozzle (30), a valve (60) being arranged between the feed channel (40) and a nozzle outlet (35) of the dual-substance nozzle (30), and in order to provide a corresponding spray head (10), as well as to provide a method for atomizing a mixture of an atomizing medium and atomizing air by means of the dual-substance nozzle (30), the dual-substance nozzle (30) is constructed in one piece and has a nozzle body (32) with a nozzle outlet (35), a movable module of the valve (60) being attached to the nozzle body by a mounting body (61) and / or pressed against the nozzle body (32) by a spring device (69).

Description

[Technical field]

[0001] The invention relates to a two-substance nozzle for atomizing a mixture of an atomizing medium and atomizing air, which is connected to at least one feed channel through which the mixture or the atomizing medium can be fed to the two-substance nozzle, a valve being arranged between this feed channel and a nozzle outlet of the two-substance nozzle.The invention also relates to a spray head for cooling and lubricating at least one die of a forming machine having a lower die and an upper die, in particular a die forging press, which is introduced into the working space between the lower die and the upper die between two working strokes and which comprises at least one corresponding two-substance nozzle.Furthermore, the invention relates to a method for atomizing a mixture of an atomizing medium and atomizing air by means of a two-substance nozzle, in which the mixture or the atomizing medium is fed to the two-substance nozzle through a feed channel and a valve and ejected from the nozzle outlet of the two-substance nozzle. [Background technology]

[0002] Such spray heads and two-substance nozzles are known, for example, from US Pat. No. 5,399,633 or from US Pat. No. 5,499,663. In this connection, the spray heads essentially consist of a multi-plate arrangement, by which separate feed channels for the atomizing medium and the atomizing air and also corresponding valves, in particular membrane valves, as well as feed channels for the control fluid are provided, by means of which the membrane valves can be controlled. Plate-type spray heads have a relatively slender structure, so that they can also reach into the smaller free space between the dies. However, the versatility of use of these spray heads remains within certain limits.

[0003] The spray head disclosed by US Pat. No. 5,399,633 allows for great versatility, since here the individual two-substance nozzles can be adjusted individually and separately.

[0004] In this connection, a completely different approach is disclosed by the as yet unpublished US Pat. No. 5,399,463, in which, although the individual nozzles are adjusted separately, a very simple manufacturing method allows for the rapid and easy provision of spray heads with individually oriented two-substance nozzles, respectively. Furthermore, several solutions are disclosed therein, which envisage preventing dripping or other undesirable accumulations of liquid. The solutions include in particular valves arranged in the immediate vicinity of the respective two-substance nozzle and which, finally, except for the movable module, are constituted in one piece with the respective two-substance nozzle. In this way, in particular the disadvantages of US Pat. No. 5,399,463 can be eliminated, where considerable distances can be found between the valves concerned and the nozzle outlets concerned, where again the transition between the different modules must be overcome. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] German Patent Application Publication No. 102006004107 [Patent Document 2] DE 19511272 A1 [Patent Document 3] US Patent Application Publication No. 2004 / 217212 [Patent Document 4] No. PCT / DE2016 / 100316 Summary of the Invention [Problem to be solved by the invention]

[0006] The object of the present invention is to provide a two-substance nozzle of the above-mentioned type and a corresponding spray head, as well as a method for atomizing a mixture of spray medium and atomizing air by means of a two-substance nozzle, which provides a simple and highly operationally reliable two-substance nozzle that can also be operated with high operational reliability in terms of dripping. [Means for solving the problem]

[0007] The object of the present invention is achieved by a dual-substance nozzle, a spray head and a method with the features of the independent claims. Further advantageous, possibly independent, embodiments can be found in the dependent claims and in the following description.

[0008] Thus, a two-substance nozzle for atomizing a mixture of atomizing medium and atomizing air, which is connected to at least one feed channel through which the mixture or the atomizing medium can be fed to the two-substance nozzle and in which a valve is arranged between this feed channel and the nozzle outlet of the two-substance nozzle, can be characterized in that it has a nozzle body constructed in one piece and with a nozzle outlet, and in that a movable module of the valve is attached to the nozzle body by a mounting body and / or pressed against the nozzle body by a spring device. Such an embodiment can utilize the advantages disclosed in the configuration according to DE 10 20 05 13 56 A1 on the one hand, by being able to provide a nozzle in accordance with the individual requirements simply and with high operational reliability, but by mounting the movable module of the valve by a separate mounting body or by pressing the movable module of the valve against the nozzle body by a spring device a very high sealing is ensured, in particular dripping can be reduced to a minimum.

[0009] A spray head for cooling and lubricating at least one die of a forming machine having a lower die and an upper die, in particular a die forging press, which is introduced into the working space between the lower die and the upper die between two working strokes and which has at least one two-substance nozzle as described above, can be provided in a correspondingly simple and highly operationally reliable manner and can also be operated with high operational reliability with regard to dripping.

[0010] Furthermore, if a method for atomizing a mixture of spray medium and spray air by means of a two-substance nozzle, in which the mixture or spray medium is fed to the two-substance nozzle through a feed channel and a valve and ejected from the nozzle outlet of the two-substance nozzle, is characterized in that the movable module of the valve is pressed against the nozzle body by a mounting body and / or by a spring device, the two-substance nozzle can be provided in the simplest and most operationally reliable manner and can be operated with high operational reliability in terms of dripping.

[0011] Unlike the solution according to US Pat. No. 5,399,433, which is essentially based on the nozzle body and the valve being in one piece, except for the movable module, in this example the movable module is pressed against the nozzle body or attached to it by a separate attachment. In this way, assembly is considerably simplified, since the nozzle body can be formed before the introduction of the movable module, which can then be attached to the nozzle body by means of the attachment. In this connection, it is to be understood that such an attachment preferably still allows sufficient mobility of the module, so that this module can still achieve its intended purpose as a movable module of the valve, for example sufficient opening and closing.

[0012] In this regard, during manufacture, the mounting body can easily be formed as a separate module at the same time as the nozzle body or the rest of the spray head, so that ultimately, during manufacture, no complementary method steps or only minimal additional method steps are required.

[0013] In particular, the movable module can be attached or pressed by the attachment so that it lies against the nozzle body and forms a seal in a partial region, thereby separating, for example, a feed channel which feeds the mixture or atomizing medium through a valve to the nozzle outlet from a structural space in which, for example, a control fluid may be present.On the other hand, it is conceivable that the movable module is relatively loosely attached to the nozzle body by the attachment and that any sealing means which may be necessary to separate the feed channel which feeds the mixture or atomizing medium to the dual-substance nozzle from other channels or spaces are provided at another location.

[0014] If the movable module is pressed or pressed against the nozzle body by a spring device, depending on the concrete embodiment of the spring force and the spring device, the movable module of the valve can be pressed against the nozzle body with sufficient sealing in all operating situations, so that possible dimensional accuracy or tolerances only have to be taken into account in a limited way. On the other hand, the spring force or the spring device can be selected in such a way that, for example, valve control by a control fluid is supported, i.e., the valve can be opened and closed independently against the pressure in the feed channel that feeds the mixture or spray medium to the two-substance nozzle. In this way, depending on the concrete embodiment, the control of the valve can be simplified, in that, for example, a smaller cross section for the control line can be used or a very practical control method can be used.

[0015] In particular, the spring devices can be attached to the nozzle body by means of the attachment body, since these spring devices can only be provided in a relaxed state, in particular when they are provided by 3D printing, and then have to be further tensioned in an assembly step. It is therefore conceivable to construct the spring device and the attachment body in one piece, and during the attachment of the attachment body to the nozzle body, the spring device is also attached there, and during this process, the spring device is biased accordingly. Likewise, the reverse is also conceivable, and the spring device can be constructed in one piece with the nozzle body, and then the movable module is fixed to the spring device, whereby the spring device is biased by the attachment device.

[0016] In this connection, it is advantageous if the mounting body absorbs the counterforce of the spring device. The counterforce may be, for example, a gas pressure if a gas pressure spring is used. Likewise, the counterforce may be a directly acting spring force if mechanical springs are used. In this connection, it is immaterial whether these mechanical springs are constructed as separate modules or in one piece with the mounting body.

[0017] The valve arranged between the feed channel, which feeds the mixture or the atomizing medium to the two-substance nozzle, and the nozzle outlet of the two-substance nozzle can preferably be opened or closed by the pressure in the feed channel. This can be implemented in particular if a corresponding movable module, such as a valve cover or valve membrane, is applied with a corresponding spring pressure from the opposite side. This spring pressure is then preferably selected such that at a selected atomizing pressure, in the feed channel, through which the mixture or the atomizing medium is fed to the two-substance nozzle, there is a sufficiently high pressure that exceeds a selected limit value, so that the valve opens, and below the limit pressure the valve closes. In this way, the valve can be controlled by controlling the pressure in this feed channel, so that a separate feed channel for the control fluid, which must also be correspondingly controlled by a separate valve for opening and closing, can be dispensed with. If necessary, for example, a gas pressure spring operated with a certain pressure of the control fluid can also be used as the spring device. If the pressure in the feed channel, through which the mixture or the atomizing medium is fed to the two-substance nozzle, exceeds the pressure of the control fluid, the movable module of the valve can be opened accordingly. If the corresponding pressure falls below this value again, the valve closes.

[0018] It will be appreciated that if necessary, a spring device can be used simply as an aid in addition to the use of a switched control fluid, so that lower pressure and therefore also less volumetric flow is required for the control fluid, which in turn can result in a correspondingly smaller control fluid valve.

[0019] Depending on the concrete implementation, for example especially when using a control fluid, it may be desirable to connect the attachment to the nozzle body in a sufficiently airtight manner or with a sufficient seal, which may require reworking, for example in the case of 3D printing, due to the relatively rough surfaces. As an alternative to this, sealing elements such as, for example, sealing rings, or also sealants or adhesives, can be arranged between the nozzle body and the attachment, in this way a sufficiently hermetic seal can be produced. Since in many concrete embodiments the attachment does not have to be removed from the nozzle body after assembly, in this connection it is of course possible to use adhesive connections that cannot be released again without destruction.

[0020] It is contemplated that the attachment may not be non-destructively releasably connected to the nozzle body.

[0021] In particular, the dual-material nozzle and the valve can be constructed in one piece, with the exception of the movable module of the valve and the mounting, as well as any adhesives or sealants, such as, for example, sealing rings, which offers the possibility of a particularly simple production of the dual-material nozzle or a corresponding spray head, in particular also by 3D printing.

[0022] As already explained above, it is advantageous if the attachment is connected to the nozzle body in a sealing manner. This is particularly the case when it is envisaged to switch the valve using a control fluid or against the gas pressure of the control fluid, and therefore here the attachment can have a sealing effect against leakage of the control fluid. In particular, a sealant or adhesive, as already mentioned above, can serve for this purpose.

[0023] Preferably, the movable module is a valve cover of a valve, which cover can in particular also be configured as a membrane, and the movable module can also be a depression spring, by means of which a further movable module, e.g. a valve cover, can be pressed, for example, against the nozzle body.

[0024] In order to prevent possible dripping as effectively as possible or to minimize the risk of such dripping, it is advantageous if the distance between the nozzle outlet and the valve is not more than 10 times the maximum diameter of the nozzle outlet. In this way, when the valve is closed, a relatively small amount of water remains between the valve and the nozzle outlet. Such a small amount of water can then be pumped out, for example, by a partial vacuum. This partial vacuum can further be provided in the two-substance nozzle, for example, by atomizing air or by a flow of the second substance of the two-substance nozzle. Further dripping is then effectively prevented by the valve or its effects are minimized.

[0025] Also, if the dual-substance nozzle has a straight path for the mixture or spray medium between the valve and the nozzle outlet, dripping can be prevented or the risk of dripping can be minimized, and therefore the risk of possible fluid accumulation of spray medium (which can cause undesirable dripping) on ​​the path between the valve and the nozzle outlet can be minimized.

[0026] Overall, it is advantageous if the individual two-substance nozzles are constructed as small as possible, so that the spray profile can be selected very individually. Such a compact construction also guarantees a corresponding advantage in the hermetic sealing of the valve due to the simple construction of the two-substance nozzle. In this connection, a larger construction is subject to substantially more complicated boundary conditions. It is therefore advantageous if the diameter of the nozzle outlet is smaller than 20 mm. This corresponds to a diameter of the atomizing medium outlet that is preferably smaller than 18 mm.

[0027] Additionally or alternatively, it is advantageous if the nozzle outlet has a diameter greater than 0.5 mm, since in the case of smaller configurations, more complex nozzle structures may be required to ensure sufficiently reliable operation of the two-substance nozzle for atomization. In this connection, it is therefore advantageous if the atomizing medium outlet has a diameter greater than 0.4 mm.

[0028] It is to be understood that the features of the solutions described above or claimed herein can also be combined, where applicable, so that advantages can be realized cumulatively.

[0029] Further advantages, objects and characteristics of the present invention will be explained using the following description of exemplary embodiments, which are also particularly shown in the accompanying drawings. [Brief description of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view of a spray head with multiple dual-material nozzles. [Diagram 2] 2 is a schematic cross-sectional view through one of the dual-substance nozzles of the spray head according to FIG. 1. [Diagram 3] FIG. 2 is a schematic side view of a molding machine configured as a die forging press with a spray head located on the spray arm. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0031] The spray head 10 shown in FIG. 1 has an upper surface 12 and a lower surface 14, which on the one hand has a two-part housing 70 with an upwardly facing two-substance nozzle 30 and a corresponding feed channel 40 in a first part and a downwardly facing two-substance nozzle 30 and a corresponding feed channel 40 in a second part, and on the other hand has a spray head leg 50 with a plurality of feed connectors 55 which are combined within the spray head leg 50 and protrude from the housing 70 according to the required controllability.

[0032] In a specific exemplary embodiment of the present invention, the feed channel 40 serves as the atomizing medium channel 45, the atomizing air channel 46, or the control channel 47 (see FIG. 2), and in the spray head leg 50, the control channel 47 and the atomizing air channel 46 are combined within the feed connector 55 for the upper part of the housing 70 and the lower part of the housing 70, respectively, and the atomizing medium channels 45 are each individually extended as feed connectors 55, so that these atomizing medium channels 45 can be individually applied with atomizing medium pressure under the control of separate valves.

[0033] Each of the two parts of the housing 17 has an essentially semicircular atomizing nozzle 80 which serves to protect the spray head 10 in the event of exposure to excessively high temperatures.

[0034] Each of the individual dual-substance nozzles 30 is configured as a Laval nozzle 31 and comprises a one-piece nozzle body 32 which respectively forms the atomizing air outlet 33 and the atomizing medium outlet 34 of the Laval nozzle 31 and merges in one piece into a feed channel 40 which respectively comprises an atomizing medium channel 45, an atomizing air channel 46 and a control channel 47. In this regard, the atomizing air channel 46 and the control channel 47, respectively, are combined in the spray head 10.

[0035] The nozzle bodies 32 are each formed with a valve 60 which has a membrane-type valve cover 65 which is pressed against or attached to the nozzle body by means of a mounting body 61 and a spring device 69 .

[0036] A sealing ring 62 is provided between the mounting body 61 and the nozzle body 32, whereby the mounting body 61, on the one hand, closes the control channel 47 to form a seal, thereby providing a spring device 69 which acts like a gas spring, and, on the other hand, presses the valve cover 65 sealingly against the nozzle body 32 on the outside of the valve cover 65.

[0037] Now, if the pressure in the atomizing medium channel 45 exceeds the pressure in the control channel 47, the valve lid 65 opens against the gas pressure of the spring device 69. If this pressure is correspondingly reduced, the valve 60 closes due to the higher pressure in the control channel 47 or in the spring device 69.

[0038] It should be understood that instead of the configuration of the spring device 69 as a gas pressure spring, for example a conventional coil spring or leaf spring can also be used at this location. In this connection, a corresponding mechanical spring can then be pressed against the valve lid 65, for example by the mounting body 61, thus providing the spring force. In this connection, it should be understood that the mounting body 61 and the mechanical spring device can then also be configured in one piece with each other.

[0039] In a variant, the control channel 47 can also be separate from the atomizing air channel 46. The atomizing medium channels 45 can then preferably be combined to form one common or two feed connectors 55, and the control channels 47 can each be individually extended and controlled as desired.

[0040] 2, the atomizing air outlet 33 also defines a nozzle outlet 35 having a diameter 36, and a distance 39 between the nozzle outlet 35 and the valve 60 is about three times the diameter 36 of the nozzle outlet 35. Depending on the specific embodiment, the distance 39 can be selected to be between 0.5 and 10 times the diameter 36 of the nozzle outlet 35.

[0041] The spray head 10 can be used, for example, in a molding machine 24, shown diagrammatically in FIG. 3, configured as a die forging press and equipped with two dies 20, namely a lower die 21 and an upper die 22, which can be moved towards and away from each other by a pressing cylinder 25.

[0042] For this purpose, the forming machine 24 comprises a lower yoke 26 and an upper yoke 27 which are spaced apart from each other by a tension rod 28 capable of acting against the pressing force applied by the pressure cylinder 25.

[0043] A movable yoke 29 is guided on the tension rod 28, which can be moved accordingly by a pressing cylinder 25 for pressing, on which the upper die 22 is attached, so that with each working stroke the upper die 22 can be lowered with a pressing effect against the lower die 21 arranged on the lower yoke 26.

[0044] As can be clearly seen, a working space 23 then arises between the upper die 22 and the lower die 21 between the two working strokes.

[0045] Depending on the specific embodiment, as is well known, the tools, and in particular the dies 20, must be lubricated and / or ventilated to ensure proper functioning, especially when workpieces are being manufactured in a constantly repeatable manner.

[0046] Here, a spray head 10 serves for this purpose, which can be introduced into the working space 23 by means of a spray arm 18 . [Explanation of symbols]

[0047] 10 Spray Head 12 Top side 14 Bottom side 18 Spray Arm 20 Die 21 Lower die 22 Upper die 23 Working Space 24 Molding machine 25 Pressurizing cylinder 26 Lower Yoke 27 Upper Yoke 28 Tension rod 29 Movable yoke 30 Two-substance nozzle (referenced as an example) 31 Laval Nozzle 32 Nozzle body 33 Atomizing air outlet 34 Spray medium outlet 35 Nozzle outlet 36 Diameter of nozzle outlet 35 39 Distance between nozzle outlet 35 and valve 60 40 feed channel (referenced as an example) 45 Atomizing medium channel 46 Atomizing Air Channel 47 Control Channel 50 Spray head leg 55 Feeding connector 60 valves 61 Mounting body 62 Sealing ring 65 Opercula 69 Spring Device 70 Housing 80 Atomizing nozzle

Claims

1. A dual-substance nozzle (30) for atomizing a mixture of an atomizing medium and an atomizing air, the dual-substance nozzle (30) being connected to at least one feed channel (40) through which the mixture or the atomizing medium can be fed to the dual-substance nozzle (30), the dual-substance nozzle (30) being provided with a valve (60) between the feed channel (40) and a nozzle outlet (35) of the dual-substance nozzle (30), The dual-substance nozzle (30) has a nozzle body (32) constructed in one piece and comprising the nozzle outlet (35), and a movable module of the valve (60) is attached to the nozzle body (61) by a mounting body (61) and / or is pressed against the nozzle body (32) by a spring device (69).

2. A spray head (10) for cooling and lubricating at least one die (20) of a forming machine (25) having a lower die (21) and an upper die (22), in particular a die forging press, the spray head (10) being introduced into a working space (23) between the lower die (21) and the upper die (22) between two working strokes and comprising at least one dual-substance nozzle (30) as claimed in claim 1.

3. A method for atomizing a mixture of an atomizing medium and atomizing air by means of a dual-substance nozzle (30), the method comprising: feeding the mixture or the atomizing medium through a feed channel (40) and a valve (60) to the dual-substance nozzle (30) and ejecting the mixture from a nozzle outlet (35) of the dual-substance nozzle (30), the method comprising: A method, characterized in that a movable module of the valve (60) is pressed against the nozzle body (32) by a mounting body (61) and / or by a spring device (69).

4. The dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 3, characterized in that the mounting body (61) absorbs the reaction force of the spring device (69), in particular the mounting body (61) and the spring device (69) are constructed in one piece.

5. The dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 4, characterized in that the valve (60) arranged between the feed channel (40) which feeds the mixture or the spray medium to the dual-substance nozzle (30) and the nozzle outlet (35) of the dual-substance nozzle (30) is opened and closed by the pressure in the feed channel (40).

6. A dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 5, characterized in that the dual-substance nozzle (30) and the valve (60), excluding the movable module of the valve (60) and the mounting body (61) and any adhesive or sealant, such as for example a sealing ring (62), are constructed in one piece.

7. The dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 6, characterized in that the mounting body (61) is connected with the nozzle body in a hermetically sealed manner and / or the movable module is a valve cover (65) and / or a push-down spring.

8. A dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 7, characterized in that the distance between the nozzle outlet (35) and the valve (60) is not more than 10 times the maximum diameter (36) of the nozzle outlet (35) and / or the dual-substance nozzle (30) has a straight path for the mixture or the spray medium between the valve (60) and the nozzle outlet (35).

9. A dual-substance nozzle (30), spray head (10) or method according to any one of claims 1 to 8, characterised in that the diameter of the nozzle outlet (35) is greater than 0.5 mm and / or less than 20 mm.

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