Injector for spraying device and spraying device thereof
The injector with angled outlet orifices enhances mixing efficiency and shelf life by promoting component interaction in the injection chamber, addressing miscibility issues and premature hardening in multi-component coatings.
Patent Information
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- EXEL INDUSTRIES
- Filing Date
- 2025-10-20
- Publication Date
- 2026-04-22
AI Technical Summary
Increasing miscibility issues between coating components due to the addition of fillers, leading to reduced mixing quality and a limited shelf life of the mixture, especially in multi-component coating products, which can result in premature hardening.
An injector with a longitudinal direction and multiple outlet orifices forming specific angles, promoting component mixing by ejecting the first component at several points and creating a vortex with the second component in the injection chamber, enhancing mixing efficiency and shelf life.
Improves the quality of the mixture and sprayed coating product by ensuring thorough mixing and extending the shelf life of the components before application.
Smart Images
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Abstract
Description
[0001] The present invention relates to an injector for a multi-component coating product spraying device and an associated spraying device. The injector has a longitudinal inlet and direction.
[0002] The injector thus allows one of the components to be injected, in particular into an injection chamber, into which at least one other of the components is injected, into an injection chamber.
[0003] This allows for mixing of the components in the injection chamber.
[0004] The quality of the mixture is important for the quality and durability of the coating product.
[0005] However, the components are becoming increasingly less miscible. In particular, the pursuit of aesthetic and / or mechanical properties in coating products leads to the addition of fillers, such as pigments, glass fibers, or other effect fillers. These fillers result in a decrease in the miscibility of the components with each other.
[0006] The quality of the mixture between the components is therefore a crucial point.
[0007] To improve mixing in a spraying device, one possibility is to carry out the mixing well upstream of the spraying, so as to increase the mixing time to promote mixing both mechanically and chemically.
[0008] However, once the components come into contact, the mixture generally has a limited shelf life. For example, for a product composed of resin and hardener, once the two components are combined, the product hardens.
[0009] This can therefore be problematic, both for low flow rates and for coating products with a very limited lifespan once mixed. The coating product is then likely to harden, completely or partially, before being sprayed.
[0010] The aim of the invention is therefore to propose a solution for a spraying device that improves the quality of the mixture and the sprayed coating product.
[0011] To this end, the invention relates to an injector for a multi-component coating product spraying device, the injector having a longitudinal direction, the injector having an inlet, characterized in that the injector has a plurality of outlet orifices, the injector being adapted to be supplied by a component product at the inlet, so that the component product exits the injector through the outlet orifices, each outlet orifice forming a given angle with respect to the longitudinal direction between 10° and 90°, preferably between 30° and 90°.
[0012] The injector is capable of ejecting the component product at several points, at an angle to the injector's longitudinal direction. This then promotes mixing with a second component at the injection chamber, in the case mentioned previously.
[0013] According to other advantageous aspects of the invention, the injector comprises one or more of the following features, taken individually or in all technically possible combinations: The injector comprises a central channel extending from the inlet and secondary channels, each secondary channel connecting a respective outlet orifice to the central channel; each secondary channel extends in a plane, the plane forming the given angle with the longitudinal direction; the central channel extends along the longitudinal direction; the cross-sectional area of the central channel is equal to the sum of the cross-sectional areas of the secondary channels; the outlet orifices are distributed around a circumference of the injector at regular angular intervals, the angular interval preferably being equal to 360° divided by the number of outlet orifices; the injector comprises between two and five outlet orifices, preferably three outlet orifices;Each outlet orifice further forms a second given angle with respect to a respective radial direction, the respective radial direction being the direction perpendicular to the longitudinal direction and a local tangential direction, the local tangential direction corresponding to the tangential direction of the injector at the location where said outlet orifice opens, the second given angle being different from 0° and less than or equal to 35°, preferably between 0° (exclusive) and 20°, and more preferably between 5° and 15°; the injector comprises a central channel extending from the inlet, the cross-section of the central channel being strictly smaller than any cross-section of the inlet; and / or the injector comprises a thread for mounting and dismounting the injector on an inlet of an injection chamber.
[0014] The invention also relates to a multi-component coating product spraying device comprising a spraying element, an injector, and an injection chamber upstream of the injector, the injector being adapted to inject the coating product into the spraying element, the spraying element being adapted to spray the coating product, the injection chamber comprising a first inlet of a first component of the coating product and a second inlet of a second component of the coating product, the first inlet being provided with an injector as defined above, the first component being injected into the injection chamber via the injector.
[0015] According to other advantageous aspects of the invention, the spraying device comprises the following features: the spraying device is provided with an injector as defined above, the second inlet being such that the second component forms a vortex in the injection chamber, the outlet orifices being such that the first component is injected with a flow having a radial component opposite to the vortex.
[0016] The invention will become clearer upon reading the following description, given solely by way of non-limiting example, and made with reference to the drawings in which: [ Fig. 1 ] there figure 1 is a cross-sectional view of a portion of a spraying device according to an example of the invention, [ Fig 2 ] there figure 2 is a cross-sectional view of a first example of an injector according to the invention, [ Fig 3 ] there figure 3 is a schematic top-view view of the injector channels of the figure 2 , [ Fig 4 ] there figure 4 is a cross-sectional view of a second example of an injector according to the invention, and [ Fig 5 ] there figure 5 is a representation of the injector of the figure 4 perpendicular to the longitudinal direction X, on which the secondary channels and outlet ports are represented.
[0017] A multi-component coating product spraying device 10 according to an example of the invention is partially shown in the figure 1 .
[0018] The spraying device 10 includes a spraying element 12, an injector 14, and an injection chamber 16 upstream of the injector.
[0019] The spraying device 10 further includes a mixer 18 between the injection chamber 16 and the injector 14.
[0020] The spraying element 12 is suitable for spraying the coating product, more particularly the coating product supplied by the injector 14.
[0021] The spraying element 12 is, for example, a spray bowl.
[0022] The spray bowl is capable of rotating around an axis of rotation.
[0023] More specifically here, the spraying device 10 further includes a turbine 20 to drive the spraying element 12 in rotation.
[0024] The injector 14 is adapted and arranged to inject the coating product to be sprayed into the spraying element 12.
[0025] Injector 14 is supplied with coating product via the injection chamber.
[0026] The injection chamber 16 includes a first inlet 22 of a first component of the coating product and a second inlet 24 of a second component of the coating product.
[0027] The first component and the second component are fluid.
[0028] The first component is, for example, a hardener.
[0029] The second component is, for example, a resin.
[0030] Here, the coating product is composed of the first component and the second component.
[0031] Alternatively, the coating product comprises more than two components. The injection chamber then includes, for example, one or more inlets similar to the second inlet. Additionally or alternatively, the spraying device then includes, for example, successive injection chambers connected in series, the successive mixture being, for example, injected at the first inlet of the injection chambers.
[0032] The injection chamber 16 delimits a volume comprising a cylindrical portion.
[0033] The first inlet 22 is provided with an injector 26 as described below.
[0034] The first component is injected into the injection chamber 16 via the injector 26.
[0035] Thus, the first component and the second component are injected into the injection chamber 16.
[0036] Injector 26 has a longitudinal direction X.
[0037] The first inlet 22 opens into the injection chamber in the longitudinal direction X, the injector 26 extending across the first inlet.
[0038] The cylindrical portion of the volume has a cylindrical shape around the longitudinal direction X.
[0039] The first entrance 22 opens into a base of the cylindrical portion.
[0040] The second entrance 24 opens, for example, perpendicularly to the longitudinal direction X.
[0041] Alternatively, the second inlet 24 opens at an angle to the longitudinal direction, for example at an angle between 0° excluded and 45°, preferably less than 25°, preferably less than 10°.
[0042] Preferably, the second inlet 24 opens at an angle, so as to be oriented towards the first inlet 22, that is to say that the flow of the product arriving through the second inlet has an opposite direction along the longitudinal direction X of the flow of product coming from the first inlet.
[0043] The second inlet 24 opens into the injection chamber at the level of the side wall delimiting the cylindrical portion.
[0044] The second inlet 24 opens opposite the injector 26 in the longitudinal direction X.
[0045] In a particular embodiment, the second inlet is such that the jet of second component forms a vortex in the injection chamber, more particularly around injector 26.
[0046] The vortex swirls around the longitudinal direction X.
[0047] The first component and the second component come into contact in the injection chamber 16 and mix.
[0048] The injection chamber includes an outlet, the outlet being here fluidly connected to the inlet of a mixer 18, for example via an injector holder included in the mixer.
[0049] Mixer 18 here is a static mixer.
[0050] The outlet of mixer 18 is fluidly connected, here directly connected, to injector 14.
[0051] A first example of injector 126 according to the invention will now be described in more detail with regard to the figures 2 And 3 .
[0052] Injector 126, for example, is made of metallic material, preferably stainless steel. This helps to limit wear and tear.
[0053] The injector 126 has an inlet 130 and a plurality of outlet ports 132, 134, 136.
[0054] Injector 126 includes, for example, between two and five outlet ports, preferably three outlet ports.
[0055] The outlet ports 132, 134, 136 are distributed over a circumference d of the injector 126 at regular angular intervals, the angular interval preferably being equal to 360° divided by the number of outlet ports.
[0056] Injector 126 is adapted to be supplied by a component product, here the first component, at the inlet 130, so that the component product flows out through the outlet ports 132, 134, 136.
[0057] Each outlet 132, 134, 136 forms a given angle α with respect to the longitudinal direction between 10° and 90°, preferably between 30° and 90°. In the example shown, the given angle α is equal to 45°, without this limiting the disclosure of this first example to this value.
[0058] The angle of an outlet orifice 132, 134, 136 corresponds to the angle of a jet exiting said outlet orifice.
[0059] More specifically here, the respective given angles for each outlet 132, 134, 136 are equal to each other.
[0060] The given angle α is oriented such that the component product exits the outlet ports with a flow oriented along the longitudinal direction X opposite to the inlet 130.
[0061] Injector 126 here has a central axis D, the central axis D extending along the longitudinal direction X.
[0062] Entry 130 is centered here on the central axis D.
[0063] The external shape of injector 126 is, for example, symmetrical by rotation around the central axis D.
[0064] The injector 126 here comprises a central channel 138 extending from the inlet 130 and secondary channels 140, 142, 144, each secondary channel 140, 142, 144 connecting a respective outlet port 132, 134, 136 to the central channel 138.
[0065] The passage section of the central channel 138 is here strictly less than the passage section of the entrance 130.
[0066] The injector also plays a role as a restrictor here.
[0067] This allows, in particular, for balancing injection pressures to better control flow regulation at the restrictor. Indeed, the hardener component often has a much lower viscosity than the resin and / or the amount of hardener to be injected, here at the restrictor, is less than the amount of resin, for example with a ratio between 1:4 and 1:15.
[0068] More specifically here, entrance 130 has a conical shape, such that the passage section decreases strictly from upstream to downstream.
[0069] The cross-sectional area of the central channel 138 is, for example, equal to the sum of the cross-sectional areas of the secondary channels 140, 142, 144.
[0070] This helps to avoid additional load losses due to the restriction of channel 130 to channel 138.
[0071] The central channel 138 extends along the longitudinal direction X, more particularly along the central axis D.
[0072] Central channel 138 is straight here.
[0073] The central channel 138 is here a cylindrical channel.
[0074] The cylinder axis of the central channel 138 is here the central axis D.
[0075] The central channel 138 extends from the entrance 130 to an intermediate intersection 146.
[0076] Each secondary channel 140, 142, 144 extends from the intermediate intersection 146 to the respective outlet port 132, 134, 136.
[0077] Thus, the inlet 130 is fluidically connected to each outlet port by the central channel 138, then the corresponding secondary channel 140, 142, 144.
[0078] Each secondary channel 140, 142, 144 extends here in a plane, the plane forming the given angle α with the longitudinal direction X, more particularly here with the central axis D.
[0079] Each secondary channel 140, 142, 144 is straight here.
[0080] More specifically, each secondary channel 140, 142, 144 forms the given angle α with respect to the longitudinal direction X, more specifically here with the central axis D.
[0081] Here, each secondary channel 140, 142, 144 has a central axis of extension, the central axis of extension being secant with the central axis D.
[0082] Each secondary channel 140, 142, 144 is here a cylindrical channel.
[0083] Each secondary channel 140, 142, 144 extends from the intermediate intersection 126 to the corresponding outlet port.
[0084] The injector 126 further includes here a thread 148 to be held in the first inlet, the first inlet having an additional thread.
[0085] This thread allows the injector to be mounted and dismounted during maintenance or when cleaning is required.
[0086] Injector 126 also includes a shoulder 150 here.
[0087] Shoulder 150 has a conical shape, adapted to receive a plastic seal, the plastic seal being a ring, in order to improve the seal between the injector and the body of the sprayer.
[0088] Injector 126, according to the first example, is capable of ejecting the component product in several jets, for example three here, at an angle to the longitudinal direction of the injector. This then promotes mixing with a second component at the injection chamber, in the case mentioned previously.
[0089] A second example of injector 226 according to the invention will now be described in more detail with regard to the figures 4 And 5 .
[0090] Items identical or similar to the first example will be numbered with the same reference incremented by 100.
[0091] For the sake of brevity, only the characteristics by which this second example differs from the first example will now be described.
[0092] In this second example shown, the given angle α is equal to 90°, but this does not limit the disclosure of this second example to this value. Similarly to the previous example, each outlet 232, 234, 236 forms a given angle α with respect to the longitudinal direction, between 10° and 90°, preferably between 30° and 90°.
[0093] The central channel 238 is similar to that of the first example.
[0094] Secondary channels 240, 242, 244 differ from the first example, in that each outlet orifice further forms a second given angle β with respect to a respective radial direction r.
[0095] The respective radial direction r is the direction perpendicular to the longitudinal direction X and a local tangential direction, the local tangential direction corresponding to the tangential direction of the injector 226 at the location where the corresponding outlet orifice opens, more particularly at the center of the corresponding outlet orifice.
[0096] The respective radial direction r is here the direction perpendicular to the longitudinal direction X and connecting the central axis D and the center of the corresponding outlet orifice.
[0097] In this embodiment, the second given angle β is different from 0° and less than or equal to 35°, preferably between 0° (exclusive) and 20°, and even more preferably between 5° and 15°.
[0098] Each secondary channel 240, 242, 244 extends here in a plane, the plane forming the given angle α with the longitudinal direction X.
[0099] Each secondary channel 240, 242, 244 is here straight.
[0100] More specifically, each secondary channel 240, 242, 244 forms the given angle α with respect to the longitudinal direction X.
[0101] In the second example, each secondary channel 240, 242, 244 has a central extension axis, the central extension axis not being intersecting with the central axis D.
[0102] The distance between the central axis D and the respective central extension axis is such that the second given angle β is as described previously.
[0103] Thus, each secondary channel 240, 242, 244 is offset from the central axis D.
[0104] Each secondary channel 240, 242, 244 is here a cylindrical channel.
[0105] Each secondary channel 240, 242, 244 extends from the intermediate intersection 126 to the corresponding outlet port.
[0106] The radial component of the exit jet, thanks to the angle β, then causes the establishment of a first component vortex.
[0107] The presence of a radial component of the outlet jet promotes mixing directly within the injection chamber 16, in particular by promoting turbulence in the injection chamber 16.
[0108] Furthermore, advantageously, the outlet ports 232, 234, 236 are positioned such that the first component is injected with a flow radially opposed to the vortex of the second component, represented by arrow V on the figure 5 if applicable.
[0109] The injectors according to the invention therefore make it possible to promote the mixing of components of a coating product, and thus to improve the quality of the sprayed coating product.
Claims
1. Injector (26; 126; 226) for a multi-component coating product spraying device (10), the injector (26; 126; 226) having a longitudinal direction (X), the injector (26; 126; 226) having an inlet (130; 230), characterized in thatThe injector (26; 126; 226) has a plurality of outlet ports (132, 134, 136; 232, 234, 236), the injector (26; 126; 226) being adapted to be supplied with a component product at the inlet (130; 230), such that the component product exits the injector (26; 126; 226) through the outlet ports (132, 134, 136; 232, 234, 236), each outlet port (132, 134, 136; 232, 234, 236) forming a given angle (α) with respect to the longitudinal direction (X) between 10° and 90°, preferably between 30° and 90°, and in which each outlet port (132, 134, 136; 232, 234, 236) further forms a second given angle (β) with respect to a respective radial direction (r), the respective radial direction (r) being the direction perpendicular to the longitudinal direction (X) and a local tangential direction, the local tangential direction corresponding to the tangential direction of the injector (26; 126;226) at the location where said outlet orifice opens (132, 134, 136; 232, 234, 236), the second given angle (β) being different from 0° and less than or equal to 35°, preferably between 0° excluded and 20°, and even more preferably between 5° and 15°.; 2. Injector (26; 126; 226) according to claim 1, wherein the injector (26; 126; 226) comprises a central channel (138; 238) extending from the inlet (130; 230) and secondary channels (140, 142, 144; 240, 242, 244), each secondary channel (140, 142, 144; 240, 242, 244) connecting an outlet orifice (132, 134, 136; 232, 234, 236) respective to the central channel (138; 238).
3. Injector (26; 126; 226) according to claim 2, in which each secondary channel (140, 142, 144; 240, 242, 244) extends in a plane, the plane forming the given angle (α) with the longitudinal direction (X).
4. Injector (26; 126; 226) according to claim 2 or 3, in which the central channel (138; 238) extends along the longitudinal direction (X).
5. Injector (26; 126; 226) according to any one of claims 2 to 4, wherein the passage area of the central channel (138; 238) is equal to the sum of the passage areas of the secondary channels (140, 142, 144; 240, 242, 244).
6. Injector (26; 126; 226) according to any one of claims 1 to 5, wherein the outlet ports (132, 134, 136; 232, 234, 236) are distributed over a circumference of the injector (26; 126; 226) at regular angular intervals, the angular interval preferably being equal to 360° divided by the number of outlet ports.
7. Injector (26; 126; 226) according to any one of claims 1 to 6, wherein the injector (26; 126; 226) comprises between two and five outlet ports (132, 134, 136; 232, 234, 236), preferably three outlet ports (132, 134, 136; 232, 234, 236).
8. Injector (26; 126; 226) according to any one of claims 1 to 7, in which the injector (26; 126; 226) comprises a central channel (138; 238) extending from the inlet (130; 230), the passage cross-section of the central channel (138; 238) being strictly less than any passage cross-section of the inlet (130; 230).
9. Injector (26; 126; 226) according to any one of claims 1 to 8, wherein the injector (26; 126; 226) comprises a thread (148) for mounting and dismounting the injector (26; 126; 226) on an inlet (22) of an injection chamber (16).
10. Multi-component coating product spraying device (10) comprising a spraying element (12), an injector (14), and an injection chamber (16) upstream of the injector (14), the injector (14) being adapted to inject the coating product into the spraying element (12), the spraying element (12) being adapted to spray the coating product, the injection chamber (16) comprising a first inlet (22) of a first component of the coating product and a second inlet (24) of a second component of the coating product, the first inlet (22) being provided with an injector (26; 126; 226) according to any one of claims 1 to 9, the first component being injected into the injection chamber (16) via the injector (26; 126; 226).
11. Spraying device according to claim 10, the second inlet (24) being such that the second component forms a vortex (V) in the injection chamber (16), the outlet orifices (132, 134, 136; 232, 234, 236) being such that the first component is injected with a flow having a radial component opposite to the vortex (V).
Citation Information
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