Venturi effect powder pump and coating product application system including such a powder pump

Abstract

Venturi-effect powder pump and coating product application system comprising such a powder pump. The present invention relates to a Venturi-effect powder pump (10) comprising a body (102), a drive gas injector (110), and an ejector (112) for a mixture comprising the powdered product, mounted in the body (102). The body defines a conduit (1022) for circulating the mixture, upstream of the ejector (112). The injector (110) and the ejector (112) are straight and extend respectively along an injector axis (A110) and an ejector axis (A112) which coincide in the assembled configuration of the powder pump (10). Indexing means (1124, 1028A) for the position of the ejector (112) within the pump body (102), rotating about the ejector axis (A112), allow the inlet of a suction chamber to be aligned with the mixing circulation conduit (1022) defined by the pump body. Figure 3 (for the abbreviated version)

Description

Title of the invention: Venturi effect powder pump and coating product application installation comprising such a powder pump

[0001] The present invention relates to a Venturi effect powder pump and a powder coating product application installation comprising, among other things, such a powder pump.

[0002] In the field of powder coating product application installations, it is known to use a Venturi effect powder pump to convey a mixture of gas and coating product drawn from a tank, to a coating product projector located near parts to be coated.

[0003] The function of a Venturi powder pump is to draw the powdered coating product into the reservoir, this coating product preferably being fluidized by the addition of a fluidizing gas, by means of a porous plate located at the bottom of the reservoir. The Venturi pump propels the mixture of gas and coating product to the spray gun, which can also be called the applicator. The performance and consistency of a Venturi pump result from the combination of two parts: a drive gas injector, which is most often air, and a mixture ejector comprising the powdered product and the drive gas. The injector is designed to inject drive gas at high speed into a suction chamber of the pump body where it expands.The expansion of the driving gas generates a vacuum in the suction chamber, which allows the powdered coating product to be drawn through a conduit defined by the pump body which is connected to the tank, most often by a tube called a "suction tube".

[0004] The performance of the injector and ejector assembly depends heavily on the correct positioning of these two parts relative to each other, in terms of coaxiality and relative distance.

[0005] Conventionally, the injector and ejector are both mounted in the pump body. In this case, the coaxiality and distance between the injector and ejector depend on the correct mounting of these two components in the pump body and on the geometry of two separate recesses provided in this pump body to receive these two parts. The causes of performance variation in such a powder pump are threefold: the machining accuracy of the injector's receiving recess in the pump body, the machining accuracy of the receiving recess of the ejector in the pump body and the precision of the mounting of the injector and ejector in the pump body.

[0006] Furthermore, with this type of equipment, the suction chamber, in which the vacuum created by the expansion of the entraining air is generated, is located directly within the pump body, with a relatively high risk of obstruction. This chamber must be carefully cleaned each time the injector or ejector of the powder pump is changed, and even between such changes.

[0007] Furthermore, WO2020 / 141090A1 is known to mount a portion of an ejector of a Venturi-effect powder pump in a forward portion of an injector of this pump. In this pump, the injector is supplied laterally with drive air. The drive air must rotate a total of approximately 90° before being injected into an upstream portion of the ejector, which creates a turbulent flow and makes the powder pump relatively inefficient in terms of suction. In addition, the mounting of the injector in the body of the powder pump is potentially unbalanced, which can lead to a misalignment of the injector outlet with respect to the ejector inlet, particularly due to a pivoting of the assembly formed by the injector and ejector, around a longitudinal axis of the ejector, within the body of the powder pump.

[0008] Similar problems may arise for Venturi effect powder pumps used in other fields of application.

[0009] It is these drawbacks that the invention intends to remedy more particularly by proposing a new powder pump in which the injector and the ejector are positioned precisely in relation to each other, as well as in relation to the body of the powder pump.

[0010] To this end, the invention relates to a Venturi effect powder pump comprising a pump body, a drive gas injector and an ejector for a mixture comprising a powdered product, in which

[0011] - the injector and ejector are mounted in the pump body in the configuration powder pump assembly;

[0012] - the pump body defines a circulation conduit for a mixture comprising the powdered product, upstream of the ejector;

[0013] - the ejector is straight and extends along an ejector axis,

[0014] - the injector and the ejector are mounted directly on top of each other.

[0015] In accordance with the invention,

[0016] - the injector is straight and extends along an injector axis;

[0017] - the injector shaft and the ejector shaft are parallel and coincident in configuration powder pump assembly; and

[0018] - the powder pump includes means for indexing the position of the ejector at within the pump body, rotating around the ejector axis, which allow an inlet of a suction chamber to be aligned with the mixing circulation conduit defined by the pump body.

[0019] Thanks to the invention, the straight design of the injector prevents the entrainment gas flow from having to follow a tortuous path, thus ensuring greater stability in the supply of entrainment gas to the suction chamber. Since the injector shaft and the ejector shaft are parallel in the assembled configuration of the powder pump, the entrainment and mixing gas flows, including the powdered product, are parallel, specifically coaxial, which facilitates the Venturi effect. Furthermore, the indexing means ensure proper positioning of the ejector within the pump body, particularly to limit pressure losses and / or powder accumulation at the inlet of a mixing chamber or the ejector.

[0020] According to advantageous but not mandatory aspects of the invention, such a powder pump may incorporate one or more of the following features taken in any technically permissible combination: - The injector shaft and the ejector shaft are combined in the assembled configuration of the powder pump. - The ejector is received at least in part in a housing of the pump body, supported against a surface of this pump body by means of a cone-on-cone type bearing, centered on the axis of the ejector. - In the assembled configuration of the powder pump, a nut screwed onto the pump body exerts a thrust force on the ejector parallel to the ejector axis, in a tightening direction of the cone-on-cone contact. - A sleeve is mounted in the housing, around the ejector. This sleeve defines with the ejector a dilution air circulation volume which opens downstream around an outlet opening of the ejector and it is provided with at least one radial passage for supplying the dilution air circulation volume, from a distribution chamber provided in the housing, around the sleeve. - The injector and ejector are screwed into each other. - The injector and ejector are assembled together by a fit cylindrical. - The injector is made of metal and the ejector is made of synthetic material, preferably plastic. - The pump body defines a drive air circulation duct upstream of the injector and a dilution air circulation duct upstream of the ejector. Supply hose connection fittings are also included. The drive and dilution air circulation ducts, as well as at least a portion of the drive and dilution air circulation ducts, each extend along an axis parallel to a longitudinal axis of the mixing circulation duct defined by the pump body. The injector axis and the ejector axis are inclined at an angle other than 90°, preferably between 30° and 60°, with respect to the longitudinal axis of the mixing circulation duct defined by the pump body. - The indexing means include a relief formed on an external peripheral surface of the ejector and a complementary relief formed on a surface delimiting a receiving housing at least partially for the ejector in the pump body.

[0021] According to a second aspect, the invention relates to a powder coating application system comprising a coating product reservoir, a drive gas source, a dilution gas source, a powder coating product sprayer, and a Venturi powder pump as mentioned above. The coating product reservoir is connected to the mixing circulation line defined by the pump body of the Venturi pump, the drive gas source is connected to a drive air inlet in the pump body, the dilution gas source is connected to a dilution air inlet in the pump body, and an ejector outlet is connected to the coating product sprayer.

[0022] The invention will be better understood and other advantages thereof will become more apparent in the light of the following description of a powder pump and a coating product application installation according to its principle, given solely by way of example and made with reference to the accompanying drawings in which: - [Fig.1] [Fig.1] is a schematic representation of the principle of a coating product application installation according to the invention incorporating a powder pump according to the invention; - [Fig.2] [Fig.2] represents, on two inserts A) and B), a section of the powder pump of the installation of [Fig.1], according to plan II in [Fig.1], as well as a larger scale detail view of detail B on insert A); - [Fig.3] [Fig.3] is an exploded perspective view of the powder pump [Fig. 2], where a body of the powder pump is shown in cross-section, in the same plane of section as in [Fig. 2]; and - [Fig.4] [Fig.4] shows, in exploded perspective, the injector and the ejector of the powder pump in figures 2 and 3, with partial removal of the ejector, at the level of one of its inlets.

[0023] The installation 2 represented very schematically in [Fig.1] includes a powder coating product reservoir 4, also called a "powder tank", in which the coating product is fluidized by means known per se and not shown, in particular a porous plate through which air flows.

[0024] The installation 2 also includes a coating product projector 6 which is intended to project the coating product 6 onto objects O to be coated, which are moved by a conveyor 8, along a conveyor axis A8.

[0025] The installation 2 also includes a Venturi effect powder pump 10 which is connected to the reservoir 4 by a suction tube 12, this suction tube sometimes being called a "suction wand" because it is a straight element which plunges into the reservoir 4.

[0026] On the other hand, the powder pump 10 is connected to the projector 6 by a flexible hose 14 supplying this projector with a mixture of powdered coating product and gas.

[0027] The projector 6 is connected to a control unit which allows in particular the activation of electrostatic charging elements of the coating product when the projector 6 is of the electrostatic type, these electrostatic charging means not being shown.

[0028] The projector 6 is shown in [Fig. 1] as a manual gun for applying a powder coating product. In an alternative not shown, the projector 6 can be an automatic projector mounted on a robot that moves it relative to the objects O to be coated; this robot can be of the multi-axis or reciprocating type.

[0029] The powder pump 10 is supplied with drive gas for the powdered coating product from a gas source SI and with dilution gas from a dilution gas source S2.

[0030] In practice, the entraining gas and the dilution gas are most often air.

[0031] Alternatively, it may be other gases, for example nitrogen.

[0032] The pressures of the entrainment gas and the dilution gas are not necessarily the same.

[0033] In what follows, we consider the special case where the entrainment gas and the dilution gas are air, it being specified that what follows is transposed to the case where the entrainment gas or the dilution gas are other gases.

[0034] The powder pump 10 comprises a pump body 102 which is advantageously made of metal, for example of steel or aluminum.

[0035] The pump body 102 defines a first conduit 1022 for the circulation of a mixture of air and powder from the reservoir 4 through the suction tube 12 and which extends along a longitudinal axis A1022 which can be described as the “suction axis”.

[0036] Advantageously, the longitudinal axis A1022 is vertical in the configuration of use of the powder pump 10 in the installation 2.

[0037] The pump body 102 also defines a second conduit 1024 for circulating the drive air. A first fitting 104 is mounted on an inlet 1024A of the second conduit 1024 and allows the connection of a hose 18 linked to the drive air source SI. The inlet 1024A constitutes a drive air inlet into the pump body 102.

[0038] The pump body 102 also defines a third duct 1026 for circulating the dilution air. A second fitting 106 is mounted on an inlet 1026A of the third duct 1026 and allows the connection of a hose 20 linked to the dilution air source S2. The inlet 1026A constitutes a dilution air inlet into the pump body 102.

[0039] A1024 is a longitudinal axis of an upstream portion of the conduit 1024. A1025 is a longitudinal axis of a downstream portion of the conduit 1024. The axes A1024 and A1025 are not parallel, which corresponds to the fact that the conduit 1024 forms a bend 1024C within the body 102.

[0040] A1026 is noted as a longitudinal axis of the conduit 1026 which is straight.

[0041] Axes A1022, A1024 and A1026 are parallel.

[0042] The pump body 102 also defines a housing 1028 which extends along a longitudinal axis A1028 inclined with respect to the axes A1022, A1024 and A1026 at an angle a different from 90°.

[0043] Advantageously, the angle aa has a value between 30 and 60°, preferably equal to about 45°.

[0044] Advantageously, the axes A1025 and A1028 are parallel, preferably coincident.

[0045] Housing 1028 is configured to receive an injector 110, an ejector 112 and a sleeve 114.

[0046] The downstream portion 1025 of the conduit 1024 opens into the bottom of the housing 1028.

[0047] Advantageously, the first conduit 1022 is located on the flow path of the coating product, upstream of the ejector 112. Advantageously, the second conduit 1024 is located, on the flow path of the drive air, upstream of the injector 110. Also advantageously, the third conduit 1026 is located, on the flow path of the dilution air, upstream of the ejector 112.

[0048] The injector 110 is straight and extends along a longitudinal axis Al 10 which forms a axis of symmetry for this injector and which constitutes an injector axis.

[0049] In the mounted configuration of the injector 110 in the housing 1028, the axes Al 10 and A1028 are coincident.

[0050] The injector 110 defines a channel Cl 10 for the circulation of driving air into a suction chamber C102 defined by the ejector 112 and into which the injector 110 enters, as seen on insert A) of [Fig.2]

[0051] The Cl 10 channel is straight and centered on the Al 10 injector axis.

[0052] The ejector 112 is straight and extends along a longitudinal axis Al 12 which forms an axis of symmetry for this ejector and which constitutes an ejector axis.

[0053] The ejector 112 defines a channel Cl 12 for the circulation of a mixture of powdered coating product and air, this channel Cl 12 being centered on the ejector axis Al 12. The outlet opening of the channel Cl 12 is denoted 0112. The outlet opening 0112 is opposite the suction chamber C102. It is connected to the projector 6 by the pipe 14 in the operating configuration of the installation 2.

[0054] In the mounted configuration of the ejector 112 in the housing 1028, the axes Al 12 and A1028 are coincident.

[0055] Advantageously, in the mounted configuration of the injector 110 and the ejector 112 in the housing 1028, the injector shaft Al 10 and the ejector shaft 112 are inclined at the angle a with respect to the axes A1022, A1024 and A1026.

[0056] In practice, the injector shaft Al 10 and the ejector shaft Al 12 are coincident in the assembled configuration of the powder pump 10.

[0057] The sleeve 114 is mounted around the ejector 112, defining with it an annular volume VI14 for the circulation of dilution air. Radially to the axis of the ejector Al 12, the volume VI14 is defined between the ejector 112 and the sleeve 114. The volume VI14 opens downstream around the outlet opening 0112 of the ejector 112.

[0058] A distribution chamber Cl 14 is provided within the housing 1028, around the elements 112 and 114. The distribution chamber 114 is supplied with dilution air from the source S2, through the conduit 1026.

[0059] Radial passages 1142 radially cross the sleeve 114 and connect the distribution chamber Cl 14 and the circulation volume V114, which allows the dilution air to progress from the conduit 1026 to the outlet of the volume VI14, around the outlet opening 0112.

[0060] In the mounted configuration of the Venturi pump 10, the injector 110 is completely received in the housing 1028, while the ejector 112 and the sleeve 114 are partially received in this housing and protrude outside the pump body 102, as seen on inset A) of [Fig.2].

[0061] A nut 116 is screwed onto an external thread 1029 of the pump body 102, provided around an outlet opening 01028 of the housing 1028 opposite the first and second conduits 1022 and 1024.

[0062] When screwed onto the thread 1029, the nut 116 comes to rest on an external collar 1144 of the sleeve 114 which it pushes towards the bottom of the housing 1028, opposite the outlet opening 01028.

[0063] On the other hand, the sleeve 114 defines a shoulder 1146 which bears axially, in a direction parallel to the axis A1028, against a corresponding shoulder 1126 of the ejector 112, which allows the pushing force exerted by the nut 116 on the collar 1144 to be transmitted to the ejector 112. The ejector 112 is thus pressed towards the bottom of the housing 1028.

[0064] Seals allow the channels Cl 10 and Cl 12, as well as the circulation volume VI14, to be isolated from the outside of the pump body 102. These consist of a seal 132 carried by the injector 110, two seals 134 and 136, carried by the ejector 112 and which are located on either side of the suction chamber C102 along the ejector shaft Al 12, and a seal 138 carried by the sleeve 114.

[0065] Reliefs 1148 for attaching the supply pipe 14 are provided on the outside of the portion of the sleeve 114 which protrudes from the pump body 102. The external shape of the sleeve 114 can be described as a "fir tree fitting".

[0066] A cone-on-cone bearing is provided between the body 102 and the ejector 112.

[0067] More precisely, a frustoconical surface S1028, internal to the body 102, delimits the housing 1028 near its bottom. This internal frustoconical surface S1028 is designed to receive, by surface support, an external frustoconical surface SI 12 of the ejector 112.

[0068] The internal frustoconical surface S1028 is centered on the axis A1028 and diverges in the direction of the outlet opening 01028. The external frustoconical surface SI 12 is centered on the ejector axis Al 12 and diverges in the direction of the outlet opening 0112.

[0069] The internal frustoconical surface S1028 is truncated at its intersection with the first conduit 1022.

[0070] The cone-on-cone contact of the surfaces SI 12 and S1028 allows precise centering of the ejector axis Al 12 on the axis A1028 and precise positioning of the ejector 112 along the axis 1028.

[0071] The nut 116 allows a thrust force to be exerted on the ejector 112 parallel to the ejector axis Al 12 in a direction of tightening the cone-on-cone bearing surface between the surfaces SI 12 and S1028. This ensures reliable positioning of the ejector 112 in the housing 1028.

[0072] On the other hand, the injector 110 and the ejector 112 are mounted directly on top of each other. Advantageously, the injector 110 is screwed into the ejector 112, opposite the outlet opening 0112. To achieve this, the injector 110 is provided with a thread external 1102 which cooperates with a correspondingly shaped tapped hole 1122 of the ejector 112, provided at the level of its inlet El 12.

[0073] The external peripheral surface of the injector 110 is provided with grooves 1104 which facilitate its handling and the application of a screwing torque in the ejector 112 when the elements 110 and 112 are assembled on each other by screwing.

[0074] Alternatively, another type of relief can be used instead of the grooves 1104, for example knurling.

[0075] The screwing of the elements 110 and 112 is carried out until a shoulder 1106 of the injector 110 comes against an annular surface S' 112 of the ejector 112 which surrounds the inlet El 12, which ensures a precise positioning of the injector 110, relative to the ejector 112 and the suction chamber C102, along the axis A1028.

[0076] To ensure that the angular orientation of the ejector 112 around the axis 1028 allows for a seamless surface connection between the conduit 1022 and the suction chamber C102, indexing means for the position of the ejector 112 within the pump body 102, rotating around the ejector axis Al 12, are provided. These indexing means allow an inlet E102 of the suction chamber C102 to be aligned with the conduit 1022.

[0077] These indexing means include a protruding relief, here a heel 1124, formed on an external peripheral surface S” 112 of the ejector 112. The heel 124 extends, locally and with a relatively restricted angular amplitude, on the order of 5 to 10°, an external peripheral collar 1125 of the ejector 112.

[0078] On the other hand, a recessed relief, here a local extension 1028A of the housing 1028, is provided to receive the protruding relief 1124 when the surfaces SI 12 and S1028 are in surface contact with each other. Advantageously, the extension 1028 has a shape complementary to that of the heel 1124. The engagement of the heel 1124 in the extension 1028A has the effect of fixing the angular position of the ejector 112, which rotates about the ejector axis Al 12 and the axis A1028 of the housing 1028, thus ensuring that the inlet E102 of the suction chamber C102 is correctly positioned relative to the conduit 1022. In this way, pressure losses and the risk of coating product accumulation at the inlet of the suction chamber C102 are minimized.

[0079] In the example of the figures, the heel 1124 is completely received in the extension 1028A in the mounted and tightened configuration of the injector 110 and the ejector 112 in the housing 1028. Alternatively, only a portion of the heel 1124 is received in the extension 1028A.

[0080] According to an unrepresented variant of the invention, a raised relief is provided on the body 102 and a recessed relief is provided on the ejector 112, as means of indexing the position of the ejector 112 within the pump body 102, in rotation around the ejector axis Al 12.

[0081] Elements 110, 112 and 114 are mounted reversibly in housing 1028. Thus, when it is necessary to carry out maintenance on the powder pump 10, nut 116 can be unscrewed and the sub-assembly formed by elements 110, 112 and 114 can be removed from housing 112, before separating sleeve 114 from elements 110 and 112.

[0082] Elements 110 and 112 can then be unscrewed from each other and element 112 can be changed when it is worn by the passage of the mixture of the powdered coating product mixed with the driving air.

[0083] In this respect, the injector 110 is preferably made of metal, while the ejector 112 is preferably made of synthetic material, for example, plastic such as high-density polyethylene or macromolecular polyethylene marketed, for example, under the brand name Polystone. Alternatively, other synthetic materials may be considered for the ejector 112.

[0084] The injector is made of a material more resistant to abrasion than the material of the ejector 112 and its channel Cl 10 carries air free of powder, unlike channel Cl 12 which carries the mixture of air and coating product. Thus, the injector 110 has a longer service life than the ejector 112.

[0085] The value of the angle a, which is different from 90°, gives the powder pump 10 good compactness along a transverse direction perpendicular to the direction of the suction axis of the coating product in the tank 4, i.e. of the axis A1022.

[0086] According to an unrepresented variant of the invention, a powder pump according to the invention can be used in an installation other than a powder coating product application installation.

[0087] According to an unrepresented variant of the invention, the injector 110 and the ejector 112 are mounted directly on each other by cylindrical fit, for example with press fitting, without being screwed together.

[0088] Any feature described above for one embodiment or variant is applicable to other embodiments and variants, insofar as this is technically possible.

Claims

Demands

1. Venturi effect powder pump (10) comprising a pump body (102), a drive gas injector (110) and an ejector (112) of a mixture comprising a powdered product, in which - the injector (110) and the ejector (112) are mounted in the pump body (102) in the assembled configuration of the powder pump (10); - the pump body defines a conduit (1022) for the circulation of a mixture comprising the powdered product, upstream of the ejector (112); - the ejector (112) is straight and extends along an ejector axis (Al 12), - the injector (110) and the ejector (112) are mounted directly on top of each other, characterized in that - the injector (110) is straight and extends along an injector axis (Al 10); - the injector axis (Al 10) and the ejector axis (Al 12) coincide in the assembled configuration of the powder pump (10);and - the powder pump includes indexing means (1124, 1028A) for the position of the ejector (112) within the pump body (102), rotating around the ejector axis (Al 12), which allow an inlet (ElO2) of a suction chamber (ClO2) to be aligned with the mixing circulation conduit (1022) defined by the pump body.;

2. Powder pump according to claim 1, wherein the injector shaft (Al 10) and the ejector shaft (Al 12) are coincident in the assembled configuration of the powder pump (10).

3. Powder pump according to any one of the preceding claims, wherein the ejector (112) is received at least in part in a housing (1028) of the pump body (102), bearing against a surface (S 1028) of this pump body by means of a cone-on-cone type bearing, centered on the ejector axis (Al 12).

4. Powder pump according to claim 3, wherein, in the assembled configuration of the powder pump (10), a nut (116) screwed onto the pump body (102) exerts, on the ejector (112), a thrusting force parallel to the ejector axis (Al 12), in a tightening direction of the cone-on-cone bearing.

5. Powder pump according to any one of claims 3 or 4, wherein - a sleeve (114) is mounted in the housing (1028), around the ejector (112); - the sleeve defines with the ejector a volume (VI14) of dilution air circulation which opens downstream around an outlet opening (0102) of the ejector; and - the sleeve is provided with at least one radial passage (1142) for supplying the circulation volume with dilution air, from a distribution chamber (Cl 14) formed in the housing (1028), around the sleeve.

6. Powder pump according to any one of the preceding claims, wherein the injector (110) and the ejector (112) are screwed into each other.

7. Powder pump according to any one of claims 1 to 5, wherein the injector (110) and the ejector (112) are assembled together by cylindrical fit.

8. Powder pump according to any one of the preceding claims, wherein the injector (110) is made of metal and the ejector (112) is made of synthetic material, preferably plastic material.

9. Powder pump according to any one of the preceding claims, wherein - the pump body (102) defines a drive air circulation conduit (1024), upstream of the injector (110), and a dilution air circulation conduit (1026), upstream of the ejector (112); - fittings (104, 106) for connecting pipes (18, 20) supplying the drive and dilution air circulation conduits (1024, 1026), as well as at least a portion of the drive and dilution air circulation conduits, each extend along an axis (A 1024, A1026) parallel to a longitudinal axis (A 1022) of the mixing circulation conduit (1022) defined by the pump body; - the injector shaft (Al 10) and the ejector shaft (Al 12) are inclined at an angle (a) different from 90°, preferably between 30 and 60°, with respect to the longitudinal axis (A 1022) of the mixture circulation conduit (1022) defined by the pump body.

10. Powder pump according to any one of the preceding claims, wherein the indexing means comprise a relief (1024) formed on an external peripheral surface (S” 112) of the ejector (112) and a complementary relief (1028A) formed on a surface (S 1028) delimiting a housing (1028) for at least partial reception of the ejector in the pump body.

11. Installation (2) for applying powder coating product comprising a coating product tank (4), a drive gas source (SI), a dilution gas source (S2), a powder coating product sprayer (6) and a Venturi powder pump (10) according to any one of the preceding claims, wherein the coating product tank (4) is connected to the mixing circulation line (1022) defined by the pump body (102) of the Venturi pump (10), the drive gas source (SI) is connected to a drive air inlet (1024A) in the pump body, the dilution gas source (S2) is connected to a dilution air inlet (1026A) in the pump body and an outlet (0112) of the ejector (112) is connected to the coating product sprayer (6).

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