Spray nozzle, arrangement comprising a spray nozzle, and method for producing a spray nozzle

Abstract

The invention relates to a spray nozzle with a housing for attachment to a cylindrical opening, in particular at the end of a pipe, wherein the housing has an outlet opening, with a swirl element arranged upstream of the outlet opening, having at least two flow guide surfaces arranged at least partially obliquely to a central longitudinal axis of the housing, wherein the swirl element is fixed to the housing, and with at least two fastening sections for attaching the swirl element to the housing, wherein the fastening sections bear against the housing, wherein each of the fastening sections is connected to one of the flow guide surfaces of the swirl element, wherein the connection between fastening section and flow guide surface is arranged in the region of a section of the flow guide surface that is located at the upstream end of the swirl element.

Description

[0001] The invention relates to a spray nozzle with a housing for fastening to a cylindrical opening, in particular at the end of a pipe, wherein the housing has an outlet opening, with a swirl element arranged upstream of the outlet opening with at least two flow guide surfaces arranged at least in sections obliquely to a central longitudinal axis of the housing, wherein the swirl element is fixed to the housing, and with at least two fastening sections for fastening the swirl element to the housing, wherein the fastening sections bear against the housing.

[0002] The invention also relates to an arrangement comprising a spray nozzle according to the invention and a tube for supplying the liquid to be sprayed. The invention also relates to a method for producing a spray nozzle according to the invention.

[0003] German utility model DE 20 2019 106 713 U1 discloses a spray nozzle with a housing for attachment to the end of a pipe. The housing has an outlet opening, and upstream of the outlet opening, a swirl element with two flow guide surfaces arranged in sections at an angle to a central longitudinal axis of the housing is provided. The swirl element is fixed to the housing. Two fastening strips are provided for attaching the swirl element, one connected to the housing and the other to the swirl element.

[0004] The invention aims to improve a spray nozzle, an arrangement with a spray nozzle and a method for producing a spray nozzle.

[0005] According to the invention, a spray nozzle having the features of claim 1, an arrangement having the features of claim 25, and a method having the features of claim 26 are provided for this purpose. Advantageous developments of the invention are mentioned in the respective subclaims.

[0006] The spray nozzle according to the invention comprises a housing for attachment to a cylindrical opening, in particular at the end of a pipe, wherein the housing has an outlet opening, with a swirl element arranged upstream of the outlet opening and having at least two flow guide surfaces arranged at least partially obliquely to a central longitudinal axis of the housing. The swirl element is fixed to the housing. At least two fastening sections are provided for attaching the swirl element to the housing, which rest against the housing. Each of the fastening sections is connected to one of the flow guide surfaces of the swirl element, wherein the connection between the fastening section and the flow guide surface is arranged in the region of a section of the flow guide surface that is arranged at the upstream end of the swirl element.

[0007] By connecting the flow guide surface and the mounting section in an area located at the upstream end of the swirl element, the flow guide surfaces can be stabilized. During operation of the spray nozzle, flow forces act on the flow guide surface. Comparatively large forces occur particularly at the upstream end of the flow guide surface, since this is where the flow first encounters the flow guide surface. Stabilizing the flow guide surface by arranging a connection between the mounting surface and the flow guide surface in this area stabilizes the swirl element and, above all, ensures significantly increased fatigue strength compared to conventional spray nozzles. In particular, vibrations of the flow guide surface can be avoided.

[0008] In a further development of the invention, the fastening sections extend parallel to the central longitudinal axis and are connected to the housing, with each fastening section being connected to the housing on the one hand and to one of the flow guide surfaces of the swirl element on the other. The arrangement of the fastening sections parallel to the central longitudinal axis enables the fastening sections to cause only low flow resistance. The fastening sections hold the flow guide surfaces relative to the housing. Each fastening section can be connected to one or two or all of the flow guide surfaces of the swirl element in order to achieve a stable design of the swirl element with high fatigue strength.

[0009] The swirl element is arranged at least in sections outside the housing, so that the housing can be made considerably lighter and smaller. The inner wall of a pipe, into whose free end the spray nozzle is inserted, can be used as a swirl chamber. Due to the lower weight of the spray nozzle and also the shorter housing of the spray nozzle compared to spray nozzles in which the swirl element is arranged entirely within the housing, the pipe is subjected to lower bending moments and generally lower mechanical loads. The arrangement with spray nozzle and pipe is therefore considerably less susceptible to vibrations and general external forces. Furthermore, due to the shorter and lighter housing, the spray nozzle according to the invention can be manufactured more cost-effectively than conventional spray nozzles in which the swirl element is arranged within the housing.This is because the section of the housing that surrounds the swirl element and thus forms the swirl chamber, which is present in conventional spray nozzles, is completely eliminated.

[0010] In a further development of the invention, the connection between the fastening section and the flow guide surface defines the upstream end of the swirl element and the fastening sections.

[0011] The fastening sections, particularly in the form of long fastening strips, are therefore connected to the respective flow guide surface at the upstream end of the swirl element. This allows for a compact, yet stable and durable arrangement.

[0012] In a further development of the invention, the swirl element and the fastening sections consist of a single sheet metal part or of several sheet metal parts connected to one another.

[0013] In this way, the swirl element can be manufactured cost-effectively and with low weight.

[0014] In a further development of the invention, the swirl element and the fastening sections consist of a plurality of sheet metal parts connected to one another, wherein a first sheet metal part engages the fastening section of a second sheet metal part and wherein the second sheet metal part engages the fastening section of the first sheet metal part.

[0015] The two sheet metal parts are thus joined together to form a stable composite, whereby the final strength and stability of the swirl element advantageously only becomes apparent when connected to the housing. This facilitates the joining of the at least two sheet metal parts, so that the at least two connected sheet metal parts are still connected to each other with some play. This play is only eliminated when the at least two sheet metal parts are then connected to the housing.

[0016] In a further development of the invention, the first sheet metal part engages with the downstream end of the first flow guide surface on the fastening section of the second sheet metal part and the second sheet metal part engages with the downstream end of the second flow guide surface on the fastening section of the first sheet metal part.

[0017] In this way, both the upstream and downstream ends of all flow guide surfaces are connected to a fastening section. This stabilizes the flow guide surfaces and, in particular, prevents vibrations of the flow guide surfaces, resulting in very high fatigue strength.

[0018] In a further development of the invention, the first flow guide surface has a projection which engages in a matching opening on a second fastening section, in particular on the fastening section of the second sheet metal part, and the second flow guide surface has a projection which engages in a matching opening on a first fastening section, in particular on the fastening section of the first sheet metal part.

[0019] By means of such matching projections and openings, the flow guide surfaces and fastening sections can be connected to one another in a form-fitting manner. In particular, the projections and matching openings are designed such that the flow guide surfaces and the fastening sections are connected with a certain amount of play, but cannot be detachably connected. Only after the swirl element with the at least two flow guide surfaces is connected to the housing are the flow guide surfaces and the fastening sections then connected to one another in a fixed and play-free manner.

[0020] In a further development of the invention, the projections are each rectangular and the openings are each rectangular.

[0021] In a further development of the invention, the first flow guide surface engages a second fastening section, in particular the fastening section of the second sheet metal part, with a section of the flow guide surface arranged perpendicular to the central longitudinal axis.

[0022] In a further development of the invention, the second flow guide surface engages a first fastening section, in particular the fastening section of the first sheet metal part, with a section of the flow guide surface arranged perpendicular to the central longitudinal axis.

[0023] In a further development of the invention, each of the fastening sections is connected to a section of a respective flow guide surface arranged perpendicular to the central longitudinal axis.

[0024] In a further development of the invention, the two flow guide surfaces are connected to each other in the area of ​​the central longitudinal axis of the housing, seen in the direction of flow.

[0025] This allows the swirl element to be designed to be extremely stable. In particular, each flow guide surface is connected to a first mounting section, to the other flow guide surface, and to the second mounting section. The flow guide surfaces are thus stabilized at three points.

[0026] In a further development of the invention, the two flow guide surfaces each have a U-shaped recess in the region of the central longitudinal axis of the housing, wherein the U-shaped recess of the first flow guide surface is inserted into the U-shaped recess of the second flow guide surface.

[0027] In a further development of the invention, a base part of each of the fastening sections is positively attached to the housing.

[0028] By positively attaching the mounting sections to the housing, the swirl element is secured to the housing through the positive connection. At least one positive connection is provided in the axial direction, i.e., in and against a flow direction through the outlet opening of the housing.

[0029] In a further development of the invention, the form closure is formed by means of a flanging.

[0030] In particular, the positive connection is achieved by flanging a collar of the housing over a base part of the fastening section or over a base part of each of the fastening sections. Flanging allows for a secure connection, while also eliminating the need for bonding processes such as soldering or welding. This significantly increases the corrosion resistance of the spray nozzle according to the invention. Flanging also allows the use of materials that cannot be welded or soldered, in particular, cannot be welded or soldered together.

[0031] In a further development of the invention, the housing has a circumferential collar at its upstream end, which is flanged radially inward at least in sections and thereby fixes the foot parts of the fastening sections to the housing.

[0032] By means of a circumferential collar, which is flanged radially inwards at least in sections, the base parts of the fastening sections can be securely and at the same time easily fixed to the housing.

[0033] In a further development of the invention, the housing has a circumferential shoulder, in particular a circumferential shoulder adjoining the circumferential collar, against which the fastening sections, in particular the foot parts of the fastening sections, rest in sections.

[0034] In this way, axial fixation of the base parts can be achieved in both axial directions, i.e., in the direction of flow through the spray nozzle and against the direction of flow through the spray nozzle. Axial fixation can thus also be achieved against the forces exerted by the fluid flowing through the spray nozzle.

[0035] In a further development of the invention, the two fastening sections each have at least one foot part running perpendicularly and / or concentrically to the central longitudinal axis of the housing in the region of their downstream end, wherein the foot parts are fixed to the housing at least in sections.

[0036] A base section running perpendicular and / or concentrically to the central longitudinal axis of the housing considerably facilitates the fixing of the fastening sections and consequently also of the swirl element to the housing.

[0037] In a further development of the invention, the foot parts are secured to the housing only in the axial direction, in particular by means of a flanging.

[0038] This makes it much easier to attach the foot parts and can be done without any material-bonding processes, i.e. without welding and / or soldering.

[0039] In a further development of the invention, each of the foot parts forms a circular section, wherein the circular section extends over an angle of 45° to 180°.

[0040] In this way, the foot parts can fit into a suitable recess in the housing and thus be securely attached to the housing.

[0041] In a further development of the invention, the foot parts are fixed in the housing under radial preload.

[0042] The swirl element is composed of two sheet metal parts, which can be permanently fixed to each other, but are still connected with some play before being attached to the housing. Only by inserting the base parts into the housing under radial preload are the two sheet metal parts fixed to each other and also immovably relative to the housing.

[0043] In a further development of the invention, a free end of at least one foot part engages one of the fastening sections or another foot part.

[0044] When the swirl element is assembled, the assembly creates an extremely stable arrangement.

[0045] In a further development of the invention, the free end of a foot part which is connected to a first fastening section engages under the end of another fastening section or under a foot part which is connected to another fastening section.

[0046] In this way, the base parts of the two fastening sections can engage with each other and thereby stabilize the twist element as a whole.

[0047] In a further development of the invention, at least two sheet metal parts are provided and the sheet metal parts are designed identically to one another.

[0048] The object underlying the invention is also achieved by an arrangement with a spray nozzle according to the invention and with a tube for supplying liquid to be sprayed, wherein the spray nozzle is fastened to the end of the tube and wherein the swirl element is arranged at least in sections within the tube.

[0049] This allows the housing to be shorter and lighter than is the case with spray nozzles where the swirl element is located within the housing. A swirl chamber is then formed by an inner wall of the tube and the swirl element located in the end section of the tube.

[0050] The object underlying the invention is also achieved by a method for producing a spray nozzle according to the invention, in which the insertion of the swirl element and / or the fastening sections into a receptacle on the housing is provided.

[0051] In a further development of the invention, the swirl element and / or the fastening sections are fixed to the housing.

[0052] Such fixing can be achieved by flanging, screwing, soldering, clinching, welding, pressing or similar in a form-fitting, material-fitting and / or friction-fitting manner.

[0053] In a further development of the invention, the connection or joining of the two sheet metal parts to each other and subsequently the insertion of the connected sheet metal parts into a receptacle on the housing is provided.

[0054] In a further development of the invention, the fixing of the swirl element and / or the fastening sections to the housing is provided by means of flanging.

[0055] By flanging, a secure connection can be created, which can also be produced cost-effectively and fully automatically.

[0056] In a further development of the invention, the at least section-wise flanging of a collar of the housing over a section of the swirl element and / or the fastening sections is provided, in particular over a respective foot part of a fastening section, for axially fixing the sheet metal parts to the housing.

[0057] In a further development of the invention, two sheet metal parts are provided, wherein the connection or joining of the two sheet metal parts to one another is provided by inserting a U-shaped recess on the first sheet metal part into a U-shaped recess on the second sheet metal part, by inserting a projection on the first sheet metal part into an opening in the fastening section of the second sheet metal part and by inserting a projection on the second sheet metal part into an opening in the fastening section of the first sheet metal part.

[0058] The two sheet metal parts are thus securely connected to each other. In particular, each flow guide surface is connected to a first fastening section on one side and a second fastening section on the other, and the two flow guide surfaces are also connected to each other.

[0059] In a further development of the invention, the two sheet metal parts are connected or joined to one another in such a way that the two sheet metal parts are movable relative to one another within limits, but are secured to one another in a captive manner.

[0060] Securing the two sheet metal parts captively to each other before they are connected to the housing significantly facilitates handling of the swirl element or the two sheet metal parts during the manufacture of the nozzle according to the invention. Only after the two sheet metal parts or the swirl element are connected to the housing are the two sheet metal parts immovably fixed relative to each other and relative to the housing.

[0061] Further features and advantages of the invention will become apparent from the claims and the following description of a preferred embodiment of the invention in conjunction with the drawings. In the drawings: Fig. 1a view of the spray nozzle according to the invention from above, Fig. 2a view of the spray nozzle of the Fig. 1 from below, Fig. 3a side view of the spray nozzle of the Fig. 1 , Fig. 4a view of the spray nozzle of the Fig. 1 from above, Fig. 5one of the Fig. 4corresponding view, with several sectional planes shown, Fig. 6 another side view of the spray nozzle of the Fig. 1 , with the spray nozzle in Fig. 6 opposite Fig. 3 rotated by 90° around the central longitudinal axis, Fig. 7 a view of the section plane AA in Fig. 5 , Fig. 8a view of the section plane BB in Fig. 5 , Fig. 9a view of the section plane CC in Fig. 5 , Fig. 10a view of the section plane DD in Fig. 5 , Fig. 11 to 20 show the Fig. 1 to 10 corresponding views of the spray nozzle of the Fig. 1 , wherein a swirl element is only inserted into the housing, but not yet positively secured to the housing, Fig. 21 a view of only the housing of the spray nozzle of the Fig. 1 from below, Fig. 22the housing of the Fig. 21 from diagonally above, Fig. 23the housing of the Fig. 21 from above, Fig. 24the housing of the Fig. 21from below, Fig. 25a first side view of the housing of the Fig. 21 , Fig. 26a second side view of the housing of the Fig. 25 , with the housing in Fig. 26 compared to the representation in Fig. 25 rotated by 90°, Fig. 27 a view of the section plane CC in Fig. 26 , Fig. 28a view of the section plane DD in Fig. 25 , Fig. 29 to 36 Fig. 21 to 28 corresponding views, wherein flanges were introduced into a circumferential collar of the housing, Fig. 37 to 46 different views of one of the sheet metal parts of the swirl element of the spray nozzle of the Fig. 1 .

[0062] Fig. 1shows a spray nozzle 10 according to the invention with a housing 12 and a swirl element 14. The swirl element 14 has a first sheet metal part 16 and a second sheet metal part 18, which are connected to each other and to the housing 12. The swirl element 14 is positively connected to the housing 12. For this purpose, a total of four flanges 22 are provided on a collar 20 of the housing 12, of which Fig. 1 only three are visible. At each of the flanges 22 there is a Fig. 1 The upper end portion of the collar 20 is flanged over a base portion of one of the sheet metal parts 16, 18 of the swirl element 14. The two sheet metal parts 16, 18 and thus also the swirl element 14 are positively fixed to the housing 12 by means of the flanges 22.

[0063] It should be noted that the flanges 22 are entirely sufficient for secure attachment of the swirl element 14 to the housing 12. In particular, the two sheet metal parts 16, 18 do not need to be joined to each other or to the housing 12 by means of material-bonding processes, such as soldering or welding.

[0064] The sheet metal parts 16, 18 and the housing 12 are advantageously made of corrosion-resistant stainless steel. The elimination of soldering or welding results in a very high corrosion resistance of the spray nozzle 10.

[0065] Fig. 2 shows a view of the spray nozzle 10 of the Fig. 1 from below, i.e. opposite to an outflow direction from an outlet opening 24 of the housing 12. A section of the swirl element 14 can be seen through the outlet opening 24.

[0066] Fig. 3 shows a side view of the spray nozzle 10 of the Fig. 1The swirl element 14 is fixed by means of two fastening sections 26, 28, of which Fig. 3 only the fastening section 28 is visible, is connected to the housing 12. The connection of the fastening sections 26, 28 is made, cf. Fig. 1 , by means of the flanges 22.

[0067] Fig. 4 shows a view of the spray nozzle of the Fig. 1 from above, i.e. in the direction of the flow of a liquid which exits through the outlet opening 24 during operation, cf. Fig. 2. In this view, the sheet metal part 18 can be seen in the upper half of the housing 12, and the second sheet metal part 16 in the lower half, which together form the swirl element 14. This view also already shows that the two sheet metal parts 16, 18 are connected to one another in the region of the central longitudinal axis of the housing 12. For this purpose, the two sheet metal parts 16, 18 are each provided with a U-shaped recess 30, with the two U-shaped recesses 30 being inserted into one another.

[0068] Fig. 5 shows one of the Fig. 4 corresponding view of the spray nozzle 10 of the Fig. 1 , whereby a total of four cutting planes AA, BB, CC and DD are shown for clarity.

[0069] Fig. 7 shows a view of the section plane AA in Fig. 5, wherein the end of a tube 32 is also shown, through which the liquid to be sprayed can be supplied. It can be seen that the housing 12 is screwed into the end of the tube 32. The tube 32 is shown only schematically. As Fig. 7 As can be seen, the housing 12 is screwed with a thread into a matching internal thread at the end of the tube 32. The swirl element 14 is arranged partially outside the housing 12, and an inner wall of the tube 32 forms a swirl chamber in which the swirl element 14 is arranged. The swirl element 14 has two flow guide surfaces 34, 36. The flow guide surface 34 forms part of the first sheet metal part 18, and the flow guide surface 36 forms part of the first sheet metal part 16.

[0070] In Fig. 7 It can already be seen that the sheet metal parts 16, 18 each have a foot section 38, wherein in Fig. 7Only one of the foot sections 38 can be seen. The foot section 38 rests against the inside of the circumferential collar 20 of the housing 12, and the collar 20 is, as already described, flanged over the foot section 38 at the flanges 22 in order to fix the foot section 38 to the housing 12.

[0071] Based on the Fig. 7It can also be seen that there is only a very small distance between a radially outer edge of the flow guide surfaces 34, 36 and the inner wall of the tube 32. The liquid to be sprayed, which is supplied via the tube 32, must therefore flow for the most part over the flow guide surfaces 34, 36 and only a very small portion can flow between the inner wall of the tube 32 and the outer edges of the flow guide surfaces 34, 36. As a result, only a very small portion of the liquid to be sprayed, which is supplied via the tube 32, is not set in rotation about a central longitudinal axis 40 of the spray nozzle 10 by means of the swirl element 14, wherein in the Fig. 7 In the arrangement shown with the spray nozzle 10 and the tube 32, the central longitudinal axes of the spray nozzle 10 and the tube 32 coincide.

[0072] Fig. 7 can be combined with the Fig. 1 to 6the design of the swirl element 14 can be seen. The flow guide surface 34 is formed by means of the second sheet metal part 18 and the flow guide surface 36 is formed by means of the first sheet metal part 16. The two flow guide surfaces 34, 36 each have a direction of flow through the pipe 32, see the arrow above the pipe 32 in Fig. 7, first section 34a, 36a, which is arranged perpendicular to the central longitudinal axis 40 and thus also perpendicular to the flow direction. The first section 34a, 36a each merges into a second section 34b, 36b, which can also be referred to as the central section. The sections 34b, 36b are each inclined by 45° with respect to the central longitudinal axis 40. A third section 34c, 36c adjoins each of the second sections 34b, 36b, wherein the third sections are again arranged perpendicular to the central longitudinal axis 40. The first section 34a of the flow guide surface 34 is integrally connected to a fastening section 26 of the first sheet metal part 18. The first section 36a is connected to a fastening section 28 of the first sheet metal part 16. Compared to the fastening sections 26, 28, the first sections 34a, 36a are each bent at right angles.The flow guide surfaces 34, 36 are each connected to the housing 12 by means of the fastening sections 26, 28, which can also be referred to as fastening strips.

[0073] As explained, the two flow guide surfaces 34, 36 are connected to each other in the area of ​​the second sections 34b, 36b, cf. Fig. 4 . For this purpose, as explained, the flow guide surfaces 34, 36 each have a U-shaped recess 30, and the U-shaped recesses are inserted into one another, so that the flow guide surfaces 34, 36 are then hooked into one another and connected to one another.

[0074] Fig. 7 It can also be seen that the housing 12, viewed in the direction of flow, Fig. 7i.e., from top to bottom, it has an inlet chamber, a constriction following the inlet chamber, and an outlet channel following the constriction. The inlet chamber narrows in the direction of flow, the constriction has a substantially constant diameter, and the outlet channel widens in the direction of flow. At the transition between the inlet chamber and the constriction, the constriction has a rounded transition. This transition area can also be formed by a chamfer. Apart from the transition area, the constriction is cylindrical.

[0075] The inner wall of the inlet chamber is arranged parallel to the central longitudinal axis 40 at its upstream beginning. The inner wall is then concavely curved as it continues along the inlet chamber, and in the illustrated embodiment, it is curved in a circular arc. At the downstream end of the inlet chamber, the inner wall of the inlet chamber is arranged at an angle of approximately 45° to the central longitudinal axis and then merges into the transition region of the constriction. At the upstream beginning of the outlet channel, the inner wall of the outlet channel is aligned with the inner wall of the constriction. Consequently, at the upstream beginning of the outlet channel, in the illustrated embodiment, the inner wall of the outlet channel is arranged parallel to the central longitudinal axis 40. As the outlet channel continues along, the widening outlet channel has convexly curved walls.In the illustrated embodiment, the cross-section of the outlet channel is circular and features a circular arc-shaped contour in the direction of flow. The outlet channel can also have a trumpet-shaped contour in cross-section. Within the scope of the invention, the outlet channel can also expand hyperbolically, exponentially, or even in a freeform manner.

[0076] At the downstream end of the outlet channel, an outlet opening is located. The outlet opening is defined by a circumferential separation edge. The separation edge is, in the cross-section of the Fig. 7seen, formed by two surfaces converging at an angle of 90° or slightly less than 90°. The separation edge ensures that no accumulation of liquid in the form of larger drops or deposits form at the edge of the outlet opening. The separation edge is surrounded by an impact protection surface, which is arranged radially outside the separation edge. The impact protection surface protrudes slightly in relation to the separation edge when viewed in the direction of flow. By means of the impact protection surface, the separation edge can be protected from damage, for example if the spray nozzle 10 is transported with the spray nozzle 10 in Fig. 7 the lower front side of the housing 12 is placed on a surface. Even in the assembled state, see Fig. 7 , the impact protection surface prevents, for example, a mechanic from inadvertently touching the tear-off edge 58 with a tool and thereby damaging it.

[0077] The above-described inner contour of the inlet chamber narrowing in the flow direction, the constriction, and the outlet channel widening in the flow direction can be modified within the scope of the invention. For example, the inlet chamber can be frustoconical, as can the outlet channel. In the illustrated embodiment, the inlet chamber, the constriction, and the outlet channel are each circular in cross-section as viewed perpendicular to the central longitudinal axis 40. Within the scope of the invention, a cross-sectional shape of the outlet channel as viewed perpendicular to the central longitudinal axis 40 can deviate from a circular shape. For example, the outlet channel can transition from the constriction, which is circular in cross-section, into an elliptical, oval, or free-form outlet opening. This can form an exiting spray jet.

[0078] The representation of the Fig. 8shows a view of the section plane BB in Fig. 5 . It can be seen in Fig. 8 that the base part 38 is positively attached to the housing 12 by means of a flange 22 and that a further base part 48 is also positively attached to the housing 12 by means of a flange 22.

[0079] The Fig. 11 to 19 show the Fig. 1 to 10 corresponding views of the spray nozzle 10, wherein, in contrast to the Fig. 1 to 10 in the Fig. 11 to 20 the flanges 22 on the collar 20 of the housing 12 are not yet provided. Fig. 11 to 20 thus show an intermediate step in the production of the spray nozzle according to Fig. 1. According to this intermediate step, the two sheet metal parts 16, 18 have already been connected to each other and, in the connected state, have been inserted into a circumferential recess of the housing 12, which is arranged radially inside the collar 20. The two foot parts 38, 48 of the sheet metal parts 16, 18 are thus received in the recess of the housing 12 under radial prestress. The swirl element 14 is thereby in the state of Fig. 11 to 20 already securely fixed to the housing 12. By inserting the flanges 22, the swirl element 14 is then positively connected to the housing 12.

[0080] Based on the Fig. 8 and 18 It can be seen that the base part 38 of the first sheet metal part 16 engages under the fastening section 26 of the second sheet metal part 18. This point is in Fig. 8 and 18each marked with the reference number 50. When pressing, pushing or pushing the swirl element 14 with the two sheet metal parts 16, 18 into the circumferential recess of the housing 12, this engagement of the foot part 38 on the Fig. 8 and 18 right end of the fastening section 26 and the corresponding engagement of the foot part 48 at the lower end of the fastening section 28 of the other sheet metal part 16 ensure that the foot parts 38, 48 can be pressed, pressed or pushed into the recess in the housing 12. The swirl element 14 is in Fig. 8 and 18 from left to right into the housing 12. The engagement in the areas 50 then ensures that the foot parts 38, 48 do not bend, but can be inserted into the recess in the housing 12.

[0081] The Fig. 21 to 28 show different views of the housing 12. It should be noted that the collar 20 of the housing 12 is designed according to the state of the Fig. 21 to 28 has not yet been flanged. The Fig. 21 to 28 thus show a state of the housing 12 during the manufacture of the spray nozzle 10, before the swirl element 14 with the two sheet metal parts 16, 18 is inserted into the housing 12.

[0082] Figs. 27 and 28 show the recess 52 of the housing, which is located radially inside the collar 20 and which is axially Figs. 27 and 28 i.e., downwards, is limited by a shoulder 54. When inserting the swirl element 14 into the recess 52, the base parts 38, 48 of the sheet metal parts 16, 18 are pushed, pressed, or pressed into the recess 52 in the axial direction until the base parts 38, 48 abut the shoulder 54. A relative position of the two sheet metal parts 16, 18 and thus also of the swirl element 14 relative to the housing is thereby precisely defined.

[0083] The foot parts 38, 48 each have a circular segment shape and are inserted into the recess 52 under radial preload.

[0084] The Fig. 29 to 36 show views of the housing 12 which correspond to the views of the Fig. 21 to 28 In contrast to the representations of the Fig. 21 to 28 the housing 12 is according to the condition of the Fig. 29 to 36 already provided with the flanges 22. The Fig. 29 to 36 are therefore only for clarification, since the flanges 22 are only introduced after the swirl element 14 has been inserted.

[0085] In Fig. 30 For example, it is clearly visible that the collar 20 of the housing 12 is only in its Fig. 30upper end section is radially flanged inwards by 90°. This is done at four points on the upper edge of the collar 20, each spaced 90° apart. Surprisingly, the flanging at four points on the collar 20, each spaced 90° apart, is sufficient to hold the swirl element 14 reliably and positively with the foot parts 38, 48 in the circumferential recess 52 of the housing. The flanges 20 created by the flanging only have to engage the foot parts 38, 48 in Fig. 30 upwards, i.e., in the axial direction opposite to the flow direction. Viewed in the flow direction, the foot parts 38, 48 are secured by means of the shoulder 54 of the recess 52.

[0086] The Fig. 37 to 46 show different views of the first sheet metal part 16 of the swirl element 14. The second sheet metal part 18 is identical to the first sheet metal part 16.

[0087] The first sheet metal part 16 has the fastening section 26, which is Fig. 37 upper end is connected to the first flow surface 36 by means of a right-angled bend. The first flow surface 36 has a first section 36a, which in the finished spray nozzle, cf. Fig. 1 , arranged perpendicular to the central longitudinal axis 40 of the spray nozzle. The first section 36a transitions into a second section 36b, which is arranged at an angle of 45° to the central longitudinal axis 40. A third section 36c of the flow guide surface 36 is then again arranged perpendicular to the central longitudinal axis 40. The U-shaped recess 30 is arranged in the second section 36b, which is then inserted into the corresponding U-shaped recess of the other sheet metal part 18.

[0088] On the third section 36c, a rectangular projection 60 can be seen, which is inserted into a matching rectangular recess on the fastening section 28 of the second sheet metal part 18, cf. Fig. 1 . The fastening section 26 of the first sheet metal part 16 also has a rectangular recess 62 into which the projection of the flow guide surface 34 of the second sheet metal part 18 is then inserted.

[0089] In Fig. 37 It can also be seen that the base part 38 of the first sheet metal part 16 protrudes vertically from the fastening section 26 and has a circular segment shape. It can also be seen that a free end of the base part is provided with a projection 64, which fits under a suitable notch on the Fig. 37lower end of the fastening section of the second sheet metal part 18 (not shown). The projection 64 consequently engages under a notch on the fastening section of the second sheet metal part 18 and a projection on the base part 48 of the second sheet metal part 18 engages under the notch 66 of the fastening section 26 of the first sheet metal part 16. In the axial direction, in Fig. 37 i.e. against an upward movement, the free ends of the foot parts 38, 48 are secured when the swirl element with the two sheet metal parts 16, 18 is inserted into the recess 52 on the housing 12, cf. Fig. 28 until the Fig. 37 lower edge of the foot parts 38, 48 strikes the shoulder 54 of the recess 52 in the housing 12.

[0090] After inserting the swirl element 14 with the two sheet metal parts 16, 18 into the recess 52 in the housing 12, the collar 20 is then flanged over the foot parts 38, 48 at four points so that the flanges 22 are created, see. Fig. 30 and the Fig. 1 to 10 . The base parts 38, 48 are thereby positively secured against being pulled out of the housing 12 against the flow direction.

Claims

1. Spray nozzle with a housing for fastening to a cylindrical opening, in particular at the end of a pipe, wherein the housing has an outlet opening, with a swirl element arranged upstream of the outlet opening with at least two flow guide surfaces arranged at least partially obliquely to a central longitudinal axis of the housing, wherein the swirl element is fixed to the housing, and with at least two fastening sections for fastening the swirl element to the housing, wherein the fastening sections bear against the housing, characterized in that each of the fastening sections is connected to one of the flow guide surfaces of the swirl element, wherein the connection between the fastening section and the flow guide surface is arranged in the region of a section of the flow guide surface which is arranged at the upstream end of the swirl element.

2. Spray nozzle according to claim 1, characterized in thatthe fastening sections extend parallel to the central longitudinal axis and are connected to the housing, wherein each fastening section is connected on the one hand to the housing and on the other hand to at least one of the flow guide surfaces of the swirl element.

3. Spray nozzle according to claim 1 or 2, characterized in that the connection between the mounting section and the flow guide surface defines the upstream end of the swirl element and the mounting sections.

4. Spray nozzle according to one of the preceding claims, characterized in that the swirl element and the fastening sections consist of a single sheet metal part or of several sheet metal parts connected to one another.

5. Spray nozzle according to one of the preceding claims, characterized in thatthe swirl element and the fastening sections consist of several sheet metal parts connected to one another, wherein a first sheet metal part engages the fastening section of a second sheet metal part and wherein the second sheet metal part engages the fastening section of the first sheet metal part, in particular characterized in that the first sheet metal part engages with the downstream end of the first flow guide surface on the fastening section of the second sheet metal part and that the second sheet metal part engages with the downstream end of the second flow guide surface on the fastening section of the first sheet metal part.

6. Spray nozzle according to one of the preceding claims, characterized in thatthe first flow guide surface has a projection which engages in a matching opening on a second fastening section, in particular on the fastening section of the second sheet metal part, and that the second flow guide surface has a projection which engages in a matching opening on a first fastening section, in particular on the fastening section of the first sheet metal part, in particular characterized in that the projections are each rectangular and the openings are each rectangular.

7. Spray nozzle according to one of the preceding claims, characterized in that the first flow guide surface engages a second fastening section, in particular the fastening section of the second sheet metal part, with a section of the flow guide surface arranged perpendicular to the central longitudinal axis.

8. Spray nozzle according to one of the preceding claims, characterized in thatthe second flow guide surface engages a first fastening section, in particular the fastening section of the first sheet metal part, with a section of the flow guide surface arranged perpendicular to the central longitudinal axis.

9. Spray nozzle according to one of the preceding claims, characterized in that each of the fastening sections is connected to a section of a respective flow guide surface arranged perpendicular to the central longitudinal axis.

10. Spray nozzle according to one of the preceding claims, characterized in that the two flow guide surfaces are connected to each other in the area of ​​the central longitudinal axis of the housing, in particular characterized in that in the region of the central longitudinal axis of the housing, the two flow guide surfaces each have a U-shaped recess, wherein the U-shaped recess of the first flow guide surface is inserted into the U-shaped recess of the second flow guide surface.

11. Spray nozzle according to one of the preceding claims, characterized in that a base part of each of the fastening sections is positively attached to the housing, in particular characterized in that the form fit is formed by means of a flanging, in particular characterized in that the housing has a circumferential collar at its upstream end which is flanged radially inwards at least in sections and thereby fixes the foot parts of the fastening sections to the housing.

12. Spray nozzle according to one of the preceding claims, characterized in that the housing has a circumferential shoulder, in particular a circumferential shoulder adjoining the circumferential collar, against which the fastening sections, in particular the foot parts of the fastening sections, rest in sections.

13. Spray nozzle according to one of the preceding claims, characterized in thatthe two fastening sections each have at least one foot part running perpendicularly and / or concentrically to the central longitudinal axis of the housing in the region of their downstream end, wherein the foot parts are fixed to the housing at least in sections, in particular characterized in that the base parts are secured to the housing only in the axial direction, in particular by means of a flange, in particular characterized in that each of the foot parts forms a circular section, wherein the circular section extends over an angle of 45 degrees to 180 degrees, in particular characterized in that the base parts are fixed to the housing under radial preload.

14. Spray nozzle according to claim 13, characterized in that a free end of at least one foot part engages one of the fastening sections or another foot part, in particular characterized in thatthe free end of a foot part connected to a first fastening section engages under the end of another fastening section or under a foot part connected to another fastening section.

15. Spray nozzle according to at least one of the preceding claims, characterized in that at least two sheet metal parts are provided and that the sheet metal parts are identical to one another.

16. Arrangement with a spray nozzle according to at least one of the preceding claims and with a tube for supplying liquid to be sprayed, wherein the spray nozzle is attached to the end of the tube and wherein the swirl element is arranged at least in sections within the tube.

17. A method for producing a spray nozzle according to at least one of the preceding claims, characterized by Inserting the swirl element and / or the fastening sections into a receptacle on the housing, in particular characterized byFixing the swirl element and / or the fastening sections to the housing, in particular characterized by Connecting or joining the two sheet metal parts together and then inserting the connected sheet metal parts into a holder on the housing.

18. Method according to claim 17, characterized by Fixing the swirl element and / or the fastening sections to the housing by flanging, in particular characterized by at least sectionally flanging a collar of the housing over a section of the swirl element and / or the fastening sections, in particular over a respective foot part of a fastening section, for axially fixing the sheet metal parts to the housing.

19. Method according to one of claims 17 to 18, wherein two sheet metal parts are provided, characterized byConnecting or joining the two sheet metal parts to each other by inserting a U-shaped recess on the first sheet metal part into a U-shaped recess on the second sheet metal part, by inserting a projection on the first sheet metal part into an opening in the fastening section of the second sheet metal part and by inserting a projection on the second sheet metal part into an opening in the fastening section of the first sheet metal part, in particular characterized in that the connection or joining of the two sheet metal parts to each other is carried out in such a way that the two sheet metal parts are movable relative to each other within limits, but are secured to each other in a non-removable manner.

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