Multi-component product injection module and coating product sprayer comprising such a module

Abstract

The present invention relates to a multi-component product injection module for a coating product sprayer. This injection module comprises an injector and a cartridge (40) forming a static mixer and defining, within a mixing body (402), a mixing path (T1) for the multi-component product, equipped with fluid mixing baffles (410). A developed length of the multi-component product mixing path (T1) is strictly greater than a length (L402) of the mixing body (402), measured parallel to a longitudinal axis (X40) of the cartridge (40). The cartridge (40) is configured to be mounted at the top of the coating product sprayer (1), on the side of this sprayer facing its spraying element (6), by being inserted in the center of a rotor of a turbine (8) of this sprayer, or in the spraying element.

Description

[0001] The present invention relates to a multi-component product injection module for a coating product sprayer, as well as a multi-component coating product sprayer comprising such a module.

[0002] In the field of coating spraying, the use of multi-component, particularly two-component, coating products is common. For the purposes of this invention, a multi-component coating product comprises at least two components. By way of non-limiting example, some two-component products are obtained by mixing a water-soluble paint and a solvent-based hardener, these two components being only slightly miscible.

[0003] To ensure the homogeneity of a multi-component coating product, it is known to use an injection module that incorporates a cartridge forming a static mixer and defining a mixing path equipped with baffles. This mixing path allows for the intimate bonding of the coating product components.

[0004] Such static mixers are known from EP3446776A, WO2019 / 014181A, WO2017 / 151305A, WO2017 / 027279A, WO2021 / 094278A, WO2011 / 044029A, US5909959A, US2018 / 111138A, US4676657 and WO2017 / 005354 A.

[0005] In these known systems, the length of a mixing path for a multi-component product within the static mixer is limited by the length of the mixing body in which the static mixer is formed. However, for some multi-component coating products, effective mixing of the product components requires a relatively long mixing path.

[0006] If the axial length of the mixing body is increased, the overall axial size of the injection module is increased accordingly, making a sprayer equipped with such an injection module bulkier and more difficult to move.

[0007] In particular, this can render a sprayer unsuitable for applying coatings to the inside of a vehicle body. Indeed, some sprayers designed to be mounted on the end of a multi-axis robot arm, such as the one known as WO2007 / 034058A, include a reservoir for a single component of a multi-component coating. This necessitates positioning mixing valves at the top of the sprayer, near a spray bowl. A multi-component coating injection module is therefore also required at the top of the sprayer. Similar problems arise with sprayers that do not have an integrated reservoir.

[0008] Furthermore, increasing the length of a mixing body in a multi-component product injection module changes the overall geometry of a sprayer equipped with a multi-component injection module compared to that of a sprayer dedicated to applying single-component products. Thus, in a workshop where both single-component and multi-component products are applied, sprayers with different axial lengths are used, requiring their respective trajectories to be programmed differently relative to the vehicle bodies being coated. The application of the different coating products then becomes complex. Finally, lengthening the mixing body of a multi-component product injection module increases its material cost, as well as the inertia and overhang of a sprayer equipped with such an injection module, relative to the robot handle on which it is mounted.

[0009] It is these drawbacks that the invention intends to remedy in particular by proposing a new multi-component product injection module, particularly efficient in terms of mixing, without significantly increasing the size of a sprayer equipped with such an injection module.

[0010] To this end, the invention relates to a multi-component product injection module for a coating product sprayer. This injection module comprises an injector and a cartridge forming a static mixer and defining, within a mixing body, a multi-component product mixing path equipped with fluid mixing baffles. The developed length of the multi-component product mixing path is strictly greater than the length of the mixing body, measured parallel to a longitudinal axis of the cartridge. According to the invention, the cartridge is configured to be mounted at the top of the coating product sprayer, on the side of the sprayer facing its spraying element, by being inserted into the center of a rotor of a turbine of this sprayer, or into the spraying element itself.

[0011] Thanks to the invention, the mixing path length of the multi-component product is sufficiently long to achieve effective mixing without increasing the overall length of the mixing unit compared to a conventional injection module, whether in a sprayer with or without an onboard tank. Furthermore, given the possibility of mounting the cartridge at the top of the sprayer, the injection module's footprint within the sprayer's turbine is particularly compact, resulting in good compactness, especially axially, for both the injection module and the sprayer equipped with it. Thus, the overall dimensions of a sprayer equipped with an injection module according to the invention can be optimized without restricting the mixing capacity of the static mixer. The trajectory programming can be the same for a single-component product sprayer and for a multi-component product sprayer.The overhang and material cost of a multi-component product sprayer are reduced compared to those of a prior art multi-component product sprayer.

[0012] According to advantageous but not mandatory aspects of the invention, such an injection module may incorporate one or more of the following features: The ratio between the developed length of the multi-component product mixing path and the length of the mixing body is greater than or equal to 1.1, preferably greater than or equal to 1.5, and preferably greater than or equal to 2. The multi-component product mixing path includes at least one portion that is not parallel to the longitudinal axis of the cartridge. The multi-component product mixing path includes at least two sections whose flow directions are reversed relative to each other. The multi-component product mixing path includes at least three sections, and the flow directions of two successive sections along the multi-component product mixing path are reversed relative to each other.The mixing body comprises a series of conduit sections, namely, straight conduit sections extending parallel to one another and defining segments of the mixing path, and connecting conduit sections linking the straight conduit sections in pairs and defining connecting branches of the mixing path. Baffles are present in each straight conduit section. The connecting sections are located at the longitudinal ends of the mixing body. The mixing path for the multi-component product is helical in shape. The mixing path consists of at least two segments, at least one of which is not parallel to the longitudinal axis of the cartridge, and whose respective longitudinal axes advantageously form an angle between 10° and 60°, preferably between 30° and 45°. The cartridge is a single piece with an injection module casing.The fins are a single piece with the mixing body.

[0013] According to a second aspect, the invention relates to a multi-component coating product sprayer comprising a first supply line for a first liquid component, a second supply line for a second liquid component, a spraying element, and a module for injecting the multi-component product into the spraying element. The multi-component product injection module is as described above. Furthermore, the cartridge is mounted at the top of the sprayer, either inserted into the center of a rotor of a sprayer turbine or into the spraying element.

[0014] The invention will be better understood and other advantages thereof will become more apparent in light of the following description of two embodiments of a coating product injection module and sprayer conforming to its principle, given solely by way of example and with reference to the accompanying drawings in which: [ Fig. 1 ] There figure 1 is a schematic cross-section of a multi-component coating product sprayer according to the invention, incorporating an injection module also according to the invention; Fig.2 ] There figure 2 represents, on several inserts A) to E) the injection module of the sprayer of the figure 1 respectively in longitudinal section, end view, exploded perspective, perspective, as well as a cartridge belonging to this injection module, also in perspective; [ Fig.3 ] There figure 3 represents on two inserts A) and B) the cartridge of the injection module of the figure 2 , in side view, highlighting by transparency the paths it defines, as well as in partial view of a multi-component coating product mixing path integrated into this cartridge; [ Fig.4 ] There figure 4 represents developed views of the mixing path of the multi-component coating product, complete, in perspective and elevation in insets A) and B), partial, in perspective and elevation with local removal, in insets C) and D); [ Fig.5 ] There figure 5 is a view analogous to the figure 2 for an injection module conforming to a second embodiment of the invention, additional sections being visible at inserts E) to G) and ; [ Fig.6 ] There figure 6 represents, on three inserts A), B) and C) a mixing body of the cartridge of the injection module of the figure 5 , a multi-component coating product mixing path defined by this body and a developed view of this mixing path, on a smaller scale.

[0015] The sprayer 1 shown in the figure 1 is intended to project a multi-component coating product onto unrepresented objects, for example, motor vehicle bodies.

[0016] This sprayer is intended to be mounted at the end of the arm 2 of a multi-axis robot and includes a main body 4 which defines an axis of rotation X6 for a spraying element, here a bowl 6, driven in rotation by a turbine 8, which is advantageously an air turbine.

[0017] The main body 4 also supports a high voltage unit 10, which allows a high continuous voltage to be applied to the coating product discharged from the edge of the bowl 6, when it rotates around the axis X6.

[0018] The coating product applied by means of the sprayer 1 is a two-component product comprising a water-soluble paint, the flow of which is controlled by a first proportional valve 12, and a hardener, the flow of which is controlled by a second proportional valve 14. The valves 12 and 14 are part of the supply lines to the bowl 6, respectively for paint and hardener, which open into the plane of the figure 1 at the level of these valves.

[0019] A line 16 supplying cleaning product opens into the plane of the figure 1 and extends, for the most part, outside of this plan.

[0020] Supply pipes 18 wound around an auxiliary body 20 of the sprayer 1 supply the turbine 8, the valves 12 and 14 and the line 16, respectively with air, paint, hardener and cleaning product. They are part of the aforementioned supply lines.

[0021] A multi-component product injection module 30 for the bowl 6 is mounted on the main body 4 by means of three screws 32. This injection module is centered on the rotation axis X6. X30 denotes a longitudinal axis of the injection module 30. In the mounted configuration of the injection module 30 on the main body 4, the axes X6 and X30 coincide.

[0022] The injection module 30 comprises a sleeve 34, preferably made of electrically conductive material such as a metal, in the shape of a socket, one piece with a base 36 in which are provided orifices 38 for the passage of the screws 32.

[0023] A cartridge 40, which is part of the injection module 30, is mounted in the casing 34.

[0024] As visible on insert C) of the figure 2 , the cartridge 40 is preferably inserted into the envelope 34, which facilitates the replacement of the cartridge 40 during maintenance operations of the injection module 30.

[0025] However, according to an unrepresented variant of the invention, the cartridge 40 is one piece with the envelope 34.

[0026] The cartridge is configured to be mounted at the top of the sprayer 1, that is, on the side of this sprayer facing the bowl 6.

[0027] In practice, for the purposes of the invention, "at the head" means that an object is mounted in the sprayer 1 by being inserted in the center of the turbine 8, more precisely of a rotor of the turbine, or in the bowl 6. Here, the injection module 30, therefore the cartridge 40, is mounted at the head of the sprayer 1.

[0028] We note X40 a longitudinal axis of the cartridge 40. This longitudinal axis X40 coincides with the axis X30 in the mounted configuration of the cartridge 40 in the envelope 34.

[0029] The injection module 30 also includes an injector 42 and a cleaning product diffuser 44. Seals 46, 48 and 50 ensure the sealing of the flow of the coating product along the injection module 30.

[0030] The sleeve formed by the envelope 34 receives both the cartridge 40 and the injector 42, which it allows to be aligned on the axis X6 of rotation of the bowl 6.

[0031] The cartridge 40 is a spare part of the injection module 30 and can be exchanged during the life of the injection module 30 and the sprayer 1, in particular after a prolonged stop, which induces a clumping of the product within it, or during a change of the sprayed coating product, if the catalyst / base component pairs are no longer miscible or when the number of baffles in the cartridge needs to change.

[0032] The cartridge 40 comprises a main body 402 which is rigid and extends longitudinally along the axis X40, and a base 404 disposed at one end of the main body 402, which surrounds this body and which includes a projecting part 406 which extends radially to the axis X40, on one side of the main body 402. The cartridge 40 also includes an end piece 408 provided on the side of the base 404 and on which the seal 46 is mounted.

[0033] Cartridge 40 is a single piece and preferably manufactured by additive manufacturing of a synthetic material such as a polyamide resin. In other words, cartridge 40 is 3D printed from synthetic material, and parts 402, 404, 406, and 408 are single pieces.

[0034] Alternatively, only the main body 402 is monobloc and parts 404, 406 and 408 are attached to it, after it has been produced by additive manufacturing.

[0035] According to another variant, the main body 402 or the entire cartridge 40 is 3D printed from a metallic material. This makes it possible to consider cleaning the cartridge 40 by pyrolysis, particularly if the coating product being mixed solidifies in the main body 402.

[0036] L402 is the axial length of the main body 402 of the cartridge 40, this axial length being measured parallel to the axis X40, therefore to the axis X30 in the mounted configuration of the cartridge 40 in the injection module 30.

[0037] In the mounted configuration of the injection module 30 in the sprayer 1, the nozzle 408 is positioned opposite a mixing chamber 22 in which flows of paint and hardener coming out of valves 12 and 14 respectively meet. Thus, in operation, the injection module 30 is supplied with both paint and hardener, by valves 12 and 14.

[0038] The main body defines a path T1 for mixing the components of the multi-component product. This path, which can also be called the mixing path, extends from bottom to top on insert A) of the figures 2 And 3 .

[0039] This mixing path T1 is helical in shape, centered on the X40 axis, and has a developed length LT1, visible at the figure 4 , which is strictly greater than the length L402, due to the helical nature of the path T1. A ratio LT1 / L402 is therefore strictly greater than 1.

[0040] Advantageously, the LT1 / L402 ratio is greater than or equal to 1.1.

[0041] Preferably, this LT1 / L402 ratio is greater than or equal to 1.5.

[0042] In practice, very satisfactory results, in terms of mixing, have been obtained with an LT1 / L402 ratio greater than or equal to 2.

[0043] Thanks to the fact that the length LT1 is strictly greater than the length L402, the path T1 of mixing the coating product can be long enough to obtain an efficient mixing of the two components of the coating product, within the static mixer formed by the main body 402 of the cartridge 40, without creating an over-length of the cartridge 40 or the injection module 30.

[0044] Thus, the injection module 30 maintains an axial length consistent with industry standards. In particular, its axial length can be equal to, or approximately equal to, that of single-component coating injection modules. Therefore, the sprayer 1 is no more cumbersome than a single-component sprayer, and its trajectory relative to a vehicle body within a coating booth can be determined in the same way as that of a single-component product sprayer.

[0045] The entire mixing path T1 is inclined relative to the longitudinal axis X40, therefore not parallel to this axis, due to the helical nature of this path.

[0046] The mixing path T1 is defined by a conduit C1 which is formed inside the main body 402 and in which baffles 410 are arranged whose function is to intimately mix the components coming respectively from the valves 12 and 14.

[0047] Advantageously, the 410 baffles are propeller or blade shaped.

[0048] Alternatively, other forms of chicanes may be chosen, including those disclosed in the documents mentioned above.

[0049] The baffles 410 are integral with the main body 402, preventing the coating components being mixed from leaking between the baffles and any part of the conduit C1. This ensures efficient mixing of the coating components throughout the entire flow path T1. Specifically, thanks to the integral design of the baffles 410 and the body 402, there are no gaps between the baffles and the body through which any part of one or more of the multi-component coating components could escape. Therefore, the risk of inhomogeneity in the multi-component coating at the outlet of the cartridge 40, and thus at the outlet of the injection module 30, is eliminated. The same applies to the risks of incomplete rinsing, which could occur if a component of the multi-component coating product were to become stuck between the baffles 410 and the conduit C1 defined by the main body 402.

[0050] On inserts B) of the figure 3 and C) and D) of the figure 4 The casing of the C1 duct was particularly removed, in order to facilitate the visualization of the 410 baffles.

[0051] In practice, these baffles are not visible since they are embedded in the mass of the main body 402, which is possible thanks to the additive manufacturing of the main body 402 of the cartridge 40.

[0052] A flow path T2 for the cleaning product is provided in cartridge 40.

[0053] This flow path T2 is also helical in shape.

[0054] Advantageously, the two helices of paths T1 and T2 are nested around the longitudinal axis X40, within the mixing body 402, which gives good axial and radial compactness to the body 402.

[0055] The path T2 is formed by a helical conduit C2 whose internal volume is free of baffles or any relief that could impede the flow of the cleaning fluid.

[0056] On the side of its mouth C2A, the conduit C2 extends into the projecting part 106, which allows this mouth to be positioned opposite the outlet of the cleaning product supply line 16, while the mouth C1A of the conduit C1, which is defined in the center of the nozzle 408, is positioned opposite the mixing chamber 22.

[0057] The outlet C1B of the conduit C1 is aligned with the longitudinal axis X40. In the mounted configuration of the cartridge 40 in the injection module 30, with the axes X30 and X40 coinciding, the outlet C1B of the conduit C1 is aligned with the mouth 42A of the injector 42.

[0058] The C2B outlet of the C2 duct is radially offset with respect to the longitudinal axis X40, as visible on insert E) of the figure 2 Furthermore, the outlet C2B of the conduit C2 is arranged to supply one or more longitudinal grooves 422 formed on the external peripheral surface of the injector 42, which allows the diffuser 44 to be supplied with cleaning product.

[0059] In the second embodiment of the invention shown in figures 5 And 6 Elements analogous to those of the first embodiment bear the same reference numbers. In what follows, if a reference number is mentioned in the description but not shown in a figure, or shown in a figure but not mentioned in the description, it corresponds to the element bearing the same reference number in the first embodiment.

[0060] In the second embodiment of the invention, the injection module 30 comprises a casing 34 fixed by screws 32 to the body of a sprayer of the type shown in the figure 1 .

[0061] An injector 42 and a cleaning product diffuser 44 are provided, as in the first embodiment, as well as seals 46 and 48.

[0062] A cartridge 40 forming a static mixer is also provided and extends along a longitudinal axis X40 which coincides with the longitudinal axis X30 of the injection module 30 in the mounted configuration of the cartridge 40 inside the casing 34 which serves to align the cartridge 40 and the injector 42 on the axis of rotation of a bowl not shown, analogous to the bowl 6.

[0063] The cartridge is configured to be mounted at the head of a sprayer similar to the sprayer 1 mentioned in reference to the first embodiment, that is to say on the side of this sprayer facing its bowl 6.

[0064] The cartridge 40 comprises a main body 402, which extends along the longitudinal axis X40 and into which are inserted three straight baffle bars 410, which extend parallel to the axis X40 in the main body 402, within three conduit portions C11, C12 and C13 which are themselves straight and parallel to the axis X40.

[0065] The cartridge also includes an inlet distributor 412 and an outlet manifold 414.

[0066] The casing 34 and the main body 402 are advantageously made of an electrically conductive material, for example, metal. The baffle bars 410 are preferably molded from a synthetic material before being inserted into the main body 402.

[0067] Alternatively, the 410 baffle bars can be made of metal.

[0068] According to an unshown variant of this second embodiment of the invention, the main body 402 and the baffle bars 410 are one-piece. The baffle bars 410 are then fixed within the main body 402 and cannot be removed from it.

[0069] In this case, thanks to the one-piece construction of the baffle bars 410 and the body 402, there are no gaps between the baffles and the body through which some of one or more components of the multi-component coating could leak. As in the first embodiment, the risks of inhomogeneity of the multi-component coating at the outlet of the cartridge 40, and therefore at the outlet of the injection module 30, are thus eliminated, as are the risks of incomplete rinsing.

[0070] In this case, elements 402 and 410 are advantageously made of synthetic material, for example, the same material as that mentioned for the first embodiment. The main body 402 and the baffle bars 410 are then preferably manufactured by additive manufacturing.

[0071] In an unrepresented variant of the invention, the distributor 412 and the collector 414 can also be monoblocs with parts 402 and 410 and made by additive manufacturing, with parts 402 and 410.

[0072] According to another variant not shown, the main body 402 and the casing 34 are monoblocs.

[0073] According to yet another variant not shown, elements 34, 402, 410, 412, and 414 are monolithic. In other words, in this case, the cartridge 40 is monolithic with the casing 34.

[0074] As is apparent from the figure 6 , the main body 402 of the cartridge 40 defines several portions of a conduit C1 in which the mixing of the components of the multi-component product takes place, along a mixing path T1.

[0075] Conduit C1 includes a first straight section C11 in which is arranged a first bar of baffles 410, a second section of connecting conduit C12, a third straight section C13 in which is arranged a second bar of baffles 410, a fourth section of connecting conduit C14 and a fifth straight section C15 in which is arranged a third bar of baffles 410.

[0076] The mixing path T1 of the multi-component product within the cartridge 10 is defined by the succession of portions C11, C12, C13, C14 and C15 of the conduit C1 and by the three baffle bars 410.

[0077] The second and fourth portions of the C12 and C14 connecting duct are generally bean-shaped, as shown in insert A) of the figure 6 and not parallel to the longitudinal axis X40. For the sake of simplicity, this shape of the connecting duct sections C12 and C14 is not repeated on inserts B) and C) of the figure 6 .

[0078] The second and fourth portions of the connecting conduit C12 and C14 are provided at the longitudinal ends of the mixing body 402.

[0079] On insert B) of the figure 6 , we have represented the mixing path T1 which includes three mixing sections T11, T13 and T15 respectively provided in the conduit portions C11, C13 and C15.

[0080] Sections T11, T13, and T15 of the mixing path T1 are straight and parallel to the X40 axis. Connecting branches B12 and B14 of the mixing path T1 link sections T11 and T13, and sections T13 and T15, respectively, being perpendicular to the X40 axis. Connecting branches B12 and B14 are provided in the second and fourth sections of connecting conduit C12 and C14.

[0081] Between the mouth C1A and the outlet C1B of the conduit C1, the coating product being mixed extends, parallel to the axis X40, in a first direction all along the section T11, in a second direction opposite to the first direction, all along the second section T13 and in a third direction identical to the first direction and opposite to the second direction, all along the section T15.

[0082] Thus, the flow directions of the coating product being mixed within two successive sections T11 and T13 or T13 and T15, along the mixing path T1, are reversed relative to each other. This allows the main body 402 to maintain a relatively short length L402, while the developed length LT1 of the flow path T1 is significantly greater than the length L402, as can be seen from insert C) of the figure 6 .

[0083] By "reversed," we mean that the projections of the mixture flow directions in successive sections T11 and T13, or T13 and T15, have orthogonal projections onto the X40 axis that are directed in opposite directions. Thus, sections T11, T13, and T15 are not necessarily parallel to the X40 axis and can be angularly offset from this axis by an angle of 5° to 30°, while having reversed flow directions of the coating product components along the mixing path T1. This is easily implemented when the cartridge is manufactured by additive manufacturing, as described above.

[0084] Advantageously, the LT1 / L402 ratio is greater than or equal to 1.1.

[0085] Preferably, this LT1 / L402 ratio is greater than or equal to 1.5.

[0086] In practice, very satisfactory results, in terms of mixing, have been obtained with an LT1 / L402 ratio greater than or equal to 2.

[0087] E30 denotes the inlet of the injection module 30, which is aligned with the X30 axis and positioned opposite a mixing chamber similar to the mixing chamber 22 of the first embodiment. The distributor 412 directs the flow of coating product components to be mixed towards the inlet C1A of the conduit C1. The distributor 412 also defines a portion of the connecting section C14, complementary to that defined by the main body 402.

[0088] The manifold 414 returns the mixed coating product to the inlet 42A of the injector 42, which inlet is located on the X30 axis, while the outlet C1B of the circuit C1 is offset from the X40 axis. The manifold 414 defines part of the connecting section C12, which completes the section defined by the main body 402.

[0089] A cleaning product flow channel C2 is provided in the thickness of the wall of the sleeve formed by the casing 34. This channel C2 is straight and parallel to the longitudinal axis X30. It defines a straight flow path T2 of the cleaning liquid and extends from the base 36 of the casing 34, up to the height of the manifold 414, from where it allows to supply one or more longitudinal grooves 422 of the injector 42.

[0090] According to an unshown embodiment of the invention, the mixing path T1 may be formed of at least two sections, preferably straight, at least one of which is not parallel to the longitudinal axis X40 of the cartridge 40, and therefore not parallel to the longitudinal axis X30 of the injection module in the cartridge-in-injection module configuration. The respective longitudinal axes of these sections may form an angle between 10° and 60°, preferably between 30° and 45°. This construction also has the effect that the developed length LT1 of the mixing path T1 is strictly greater than the length L402 of the main body of the cartridge 40. In this case as well, the baffles 410 of the mixing path T1 are advantageously integral with the main body 402.

[0091] The invention is described above and illustrated in the figures in the case where the multi-component product is a two-component product. However, it is applicable with products having more than two components, in which case the number of supply lines and valves of the sprayer 1 is adjusted.

[0092] The technical characteristics of the embodiments and variants mentioned above can be combined with each other, according to any technically permissible combinations.

Claims

1. Multi-component product injection module (30) for coating product sprayer (1), this injection module comprising an injector (42) and a cartridge (40) forming a static mixer and defining, within a mixing body (402), a mixing path (T1) of multi-component product, equipped with fluid mixing baffles (410), in which a developed length (LT1) of the mixing path (T1) of multi-component product is strictly greater than a length (L402) of the mixing body (402), measured parallel to a longitudinal axis (X40) of the cartridge (40) characterized in that the cartridge (40) is configured to be mounted at the head of the coating product sprayer (1), on the side of this sprayer facing its projection member (6), by being inserted in the center of a rotor of a turbine (8) of this sprayer, or in the projection member.

2. Injection module according to claim 1, wherein a ratio between, on the one hand, the developed length (LT1) of the mixing path (T1) of multi-component product and, on the other hand, the length (L402) of the mixing body (402) is greater than or equal to 1.1, preferably greater than or equal to 1.5, preferably even greater than or equal to 2.

3. Injection module according to any one of the preceding claims, wherein the mixing path (T1) of multi-component product comprises at least one portion (T1, B12, B14) not parallel to the longitudinal axis (X40) of the cartridge (40).

4. Injection module according to any one of the preceding claims, wherein the mixing path (T1) of multi-component product comprises at least two sections (T11, T13, T15) whose flow directions are reversed with respect to each other.

5. Injection module according to claim 4, wherein the mixing path (T1) of multi-component product comprises at least three sections (T11, T13, T15) and wherein the flow directions of two successive sections along the mixing path of multi-component product are reversed with respect to each other.

6. Injection module according to any one of the preceding claims, wherein the mixing body (402) comprises a succession of conduit portions (C11-C15), namely: - straight conduit portions (C11, C13, C15) which extend parallel to each other and which define sections (T11, T13, T15) of the mixing path (T1); and - connecting conduit portions (C12, C14) which connect the straight conduit portions (C11, C13, C15) in pairs and which define connecting branches (B12, B14) of the mixing path, and wherein baffles (410) are present in each straight conduit portion (C11, C13, C15).

7. Injection module according to claim 6, in which the connecting portions (C12, C14) are provided at the longitudinal ends of the mixing body (402).

8. Injection module according to any one of claims 1 to 3, wherein the mixing path (T1) of multi-component product is helical in shape.

9. Injection module according to any one of claims 1 to 3, wherein the mixing path (T1) is formed of at least two sections, at least one of which is not parallel to the longitudinal axis (X40) of the cartridge (40) and whose respective longitudinal axes advantageously form an angle between them of between 10° and 60°, preferably between 30° and 45°.

10. Injection module according to any one of the preceding claims, wherein the cartridge (40) is one piece with a casing (34) of the injection module (30).

11. Injection module according to any one of the preceding claims, wherein the fins (410) are monobloc with the mixing body (402).

12. Multi-component coating product sprayer (1) comprising a first feed line (12) for a first liquid component, a second feed line (14) for a second liquid component, a spraying element (6) and a multi-component product injection module (30) into the spraying element, characterized in that the multi-component product injection module (30) is according to one of the preceding claims and in that the cartridge is mounted at the head of the sprayer, by being inserted in the center of a rotor of a turbine (8) of the sprayer, or in the projection element (6).

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