AU2016340366C1

AU2016340366C1 - Fuel distributor, the hydraulic compartment of which is equipped with an additive injection device

Info

Publication number: AU2016340366C1
Application number: AU2016340366A
Authority: AU
Inventors: Colas COUTANCE; Merlin TAYO FONANG
Original assignee: Tokheim Holding BV
Current assignee: Tokheim Holding BV
Priority date: 2015-10-23
Filing date: 2016-10-21
Publication date: 2019-04-11
Anticipated expiration: 2036-10-21
Also published as: AU2016340366A1; CN108367906B; CN108367906A; WO2017068545A1; EP3365268B1; AU2016340366B2; EP3365268A1; FR3042787A1; PT3365268T

Abstract

Fuel distributor (1) comprising a hydraulic compartment (2) comprising at least one pumping unit (4) connected to at least one fuel distribution line (3) comprising a fuel flow meter (5) and a flexible tube (6) equipped with a nozzle (7), as well as at least one additive injection device (8) comprising an additive reservoir (9) and at least one injection unit (12) intended to suck a regulated quantity of additive from the additive reservoir (9) to the fuel distribution line (3), said injection unit (12) comprising a suction pump (10) driven by a motor (11), characterised in that the injection unit (12) comprises an explosion-proof housing (13) in which the motor is housed (11), the suction pump (10) being mounted outside of the explosion-proof housing (13) and being driven by the motor (11) via a drive shaft (14) passing through a wall (15) of the explosion-proof housing (13), the suction pump (10) and the motor (11) being separated by said wall (15) of the explosion-proof housing.

Description

The present invention relates to a fuel distributor, the hydraulic compartment of which is equipped with an additive injection device.

In general, the fuel distributors encountered in service stations include a pump unit intended for drawing the fuel into a storage tank, including a pump driven by a motor, and a distribution line connected to this pump unit. The distribution line includes a fuel flow meter, which is set in motion by the pump unit, and a flexible hose equipped with a distribution nozzle actuated by the user, in order to fill the tank of his/her vehicle.

Today, oil companies increasingly offer their clientele additive products as supplement for the fuel, for example, in order to improve the lubrication of the motors or the combustion of the fuel.

One of the means currently known for adding an additive to a fuel consists in pouring the additive directly into the tank of the vehicle from, for example, a can sold separately, or in carrying out the addition further upstream in the production of the fuel in a refinery.

In addition, devices exist for injection of a liquid additive during the distribution of a fuel through a distribution line of a fuel distributor, as described in the document WO98/23530.

Such an injection device comprises a liquid additive reservoir, a suction pump for the liquid additive, a drive motor for the suction pump, and a circulation pipe intended to bring the liquid additive to the distribution nozzle. The injection device is suitable for delivering, in the fuel distribution line, a dose of additive, which is proportional to the fuel flow running through this line.

Thus, the injection device achieves automatic addition of the additive in the distribution line, and, more precisely, at the end of the distribution line, since the addition occurs in the nozzle. The precision with regard to the concentration of liquid additive is guaranteed perfectly, irrespective of the fuel distribution flow imposed by the user by his/her action on the nozzle.

The pump assembly and the fuel flow meter of the fuel distributors are conventionally housed in a hydraulic compartment. The injection device can be placed in the hydraulic compartment, as described in the document WO98/23530.

The hydraulic compartment is a dangerous area where fuel vapors are often present. In order to prevent risks of explosion, all the electrical components present in the hydraulic compartment have to comply with the European Directives 94/9/EC or 2014/34/EU relating to explosive atmospheres, referred to as the ATEX directives.

For the additive injection device to comply with the explosion-protection standards and directives, it is known how to use a suction pump powered by an ATEX motor, which makes it possible to use the additive injection system safely in a fuel distributor.

However, ATEX motors have an additional protective shell, which makes them larger and more expensive than conventional non-ATEX motors. The injection system can include several injection units, each comprising a pump and a motor, which accordingly increases the costs and space requirement.

The aim of the present invention is to remedy this disadvantage by proposing a fuel distributor, the hydraulic compartment of which is equipped with an ATEX additive injection device, which is more compact and less expensive.

For this reason, the invention relates to a fuel distributor, the hydraulic compartment of which is equipped with at least one additive injection device including an additive reservoir and at least one injection unit intended to draw a controlled amount of additive from the additive tank to a fuel distribution line of the fuel distributor, in order to deliver a fuel/additive mixture. This injection unit includes a suction pump powered by a motor. The motor is a non-ATEX motor.

According to the invention, the additive injection device includes an explosion-proof housing in which the motor is housed. The suction pump is arranged outside of the explosionproofhousing and is powered by the motor via a driveshaft passing through a wall of the explosion-proof housing. The suction pump and the motor are separated by this wall of the explosion-proof housing.

According to another feature of the invention, the injection unit includes a clamping plate fastened on the wall of the explosion-proof housing and covering an opening provided in this wall. The motor is fastened on a first face of the clamping plate, and the suction pump is fastened on a second face of the clamping plate opposing the first surface. The drive shaft passes through the clamping plate in order to connect the motor to the suction pump, and a first flame path is provided between the clamping plate and the wall.

According to another feature of the invention, the opening of the wall of the explosionproofhousing is defined by a peripheral surface. This clamping plate includes a circular lower portion comprising a peripheral surface facing the peripheral surface of the opening of the wall of the explosion-proof housing and separated from it by a space forming a first portion of the first flame path.

According to another feature of the invention, the space forming the first portion of the first flame path is less than or equal to 0.5 mm and preferably less than or equal to 0.15 mm.

According to another feature of the invention, the clamping plate includes an upper portion extending radially with respect to the circular lower portion. The upper portion comprises a peripheral bearing surface, which comes in contact on an external surface of the wall of the explosion-proof housing. A second portion of the first flame path is formed between these surfaces.

According to another feature of the invention, the clamping plate includes a central channel through which the drive shaft passes. A second space is provided between the drive shaft and the clamping plate, in such a manner as to form a second flame path.

According to another feature of the invention, the second space forming the second flame path is less than or equal to 0.5 mm and preferably less than or equal to 0.2 mm.

According to another feature of the invention, the wall of the explosion-proof housing is a removable cover resting on a bearing surface of the explosion-proof housing, forming a third flame path.

According to another feature of the invention, the motor is fastened directly on the clamping plate such as to be in contact with this clamping plate. This motor drives a first front shaft portion in order to drive the suction pump, and a second rear shaft portion interacting with a position detector positioned at the rear of the motor.

Thus, the invention provides a fuel distributor, the hydraulic compartment of which is equipped with an ATEX additive injection device enabling its use in an explosive atmosphere, and which is more compact and more economical than those of the prior art.

Indeed, the invention makes it possible to use non-ATEX motors, which require less space and are less expensive than ATEX motors.

According to another feature of the invention, the pump unit is connected to two fuel distribution lines, each comprising a flow meter and a flexible hose equipped with a nozzle, the additive injection device including two injection units connected to the additive reservoir and each connected to a respective fuel distribution line, the additive injection device including a control card for controlling the motors, which is arranged at the bottom of the explosion-proof housing.

This configuration makes it possible to make the additive injection device more compact and avoid having additional electrical cables passing through the explosion-proof housing in order to connect the card, which, in that case, would be located outside of the explosion-proof housing.

According to another feature of the invention, the explosion-proof housing is placed under the additive reservoir, in such a manner as to form a vertical stack, the additive reservoir including an outlet on the lower portion thereof, which is connected to the injection unit.

This configuration makes it possible to obtain vertical stacking, which takes up the least amount of space possible. In addition, it makes it possible to obtain a flow of additive simply by gravity, avoiding air bubbles in the additive and the use of a degassing system. This arrangement also makes it possible to reduce as much as possible the length of the pipes between the reservoir and the injection unit, thereby reducing the costs.

The additive injection device is placed at the end of the hydraulic compartment, in a first accommodation defined by a first lateral wall and by a second lateral wall extended on the lower portion thereof by a reservoir support perpendicular to the rest of the second lateral wall. The explosion-proof housing is fastened to the reservoir support by means of a fastening element.

This makes it possible to obtain a very compact additive injection device, which can be inserted into an accommodation provided initially for a fuel pump unit. In other words, the injection device replaces a fuel pump unit, which makes it possible not having to modify the frame of the fuel distributors and lengthen the fuel distributor. A fuel distributor, which is already in service at a station, can thus be modified and incorporate an additive injection device.

The features of the fuel distributor to which the invention relates will be described in greater detail in reference to the appended non-limiting drawings, in which:

- Figure 1 diagrammatically represents a fuel distributor, including an additive injection device according to the invention,

- Figure 2 is a diagrammatic cross-sectional view of an injection unit mounted on a wall of the explosion-proof housing,

- Figures 3 and 4 represent in perspective a view of the clamping plate from below and from above, respectively,

- Figure 5 is a diagrammatic perspective view of an injection unit according to one possible embodiment,

- Figure 6 diagrammatically represents the explosion-proof housing of an additive injection device on the cover of which, four injection units are fastened.

Figure 7 is an exploded view of the explosion-proof housing represented in

Figure 6,

- Figure 8 diagrammatically represents the additive injection device as mounted in a hydraulic compartment.

As shown in figure 1, the fuel distributor 1 includes a hydraulic compartment 2 comprising at least one pump unit 4 connected to at least one fuel distribution line 3. The pump unit 4 comprises a pump driven by a motor, and a degassing chamber. The fuel distribution line 3 includes a fuel flow meter 5 and a flexible hose 6 equipped with a nozzle 7.

More often, the pump unit 4 comprises two fuel distribution lines 3, each associated with one of the sides of the fuel distributor 1.

The fuel distributor 1 includes an additive injection device 8, which is arranged inside the hydraulic compartment 2.

The additive injection device 8 includes at least one additive reservoir 9 and at least one injection unit 12 intended to draw a controlled amount of additive from the additive reservoir 9 to the fuel distribution line 3 of the fuel distributor 1.

The injection unit 12 includes a suction pump 10 driven by a motor 11.

The additive injection device 8 includes an explosion-proof housing 13 in which the motor 11 is housed. The suction pump 10 is arranged outside of the explosion-proof housing 13 and is driven by the motor 11 via a drive shaft 14 passing through a wall 15 of the explosionproofhousing 13. The suction pump 10 and the motor 11 are separated by the wall 15 of the explosion-proof housing 13.

As an example, the explosion-proof housing 13 can be an Exd or Exe junction box of the M2000 type.

As shown in figures 1 and 2, the injection unit 12 includes a clamping plate 16 fastened on the wall 15 of the explosion-proof housing 13 and covering an opening 20 formed in the wall 15. The clamping plate 16 includes a first face 17 and a second face 18 opposite the first face 17.

The first face 17 is located inside the explosion-proof housing 13, and the second face 18 is located outside of the explosion-proof housing 13. The motor 11 is fastened on the first face 17 of the clamping plate 16, and the suction pump 10 is fastened on the second face 18 of the clamping plate 16.

As shown in figure 2, the drive shaft 14 passes through the clamping plate 16 in order to connect the motor 11 to the suction pump 10. A first flame path 19a, 19b is provided between the clamping plate 16 and the wall 15.

The wall 15 of the explosion-proof housing 13 includes an opening 20 in which the clamping plate 16 is housed. The opening 20 of the wall 15 of the explosion-proof housing 13 is defined by a peripheral cross-sectional surface 23. As shown in figures 3 and 4, the clamping plate 16 includes a circular lower portion 24 comprising a peripheral surface 25. This peripheral surface 25 faces the peripheral surface 23 of the opening 20 of the wall 15 of the explosion-proof housing 13 and is separated therefrom by a space 37 forming a first portion 19a of the first flame path 19a, 19b.

The space 37 forming the first portion 19a of the first flame path 19a, 19b is less than or equal to 0.5 mm and preferably less than or equal to 0.15 mm, so as to make it possible for a flame to be retarded and to stop the propagation of this flame in case of an explosion in the explosion-proof housing 13. The space 37 is advantageously 0.15 mm.

The first portion 19a of the first flame path 19a, 19b has a volume of annular crosssection, that is to say, a volume defined between two concentric hoses. The volume of annular cross-section is advantageously constant around the entire circular lower portion 24 of the clamping plate 16. The first flame path 19a, 19b makes possible a fluidic connection between the interior of the explosion-proof housing 13 and the exterior in such a manner as to laminate the flame.

The clamping plate 16 includes an upper portion 26 extending radially with respect to the circular lower portion 24. The upper portion 26 comprises a peripheral bearing surface 28, which comes in contact on an external surface 27 of the wall 15 of the explosion-proof housing 13.

A second portion 19b of the first flame path 19a, 19b is formed between the peripheral bearing surface 28 of the circular lower portion 24 of the clamping plate 16 and the external surface 27 of the wall 15 of the explosion-proof housing 13. These surfaces 27, 28 have small flatness defects. The contact between these surfaces 27, 28 is imperfect, which is sufficient to laminate a possible flame.

The peripheral surface 25 of the circular lower portion 24 and the peripheral bearing surface 28 of the upper portion 26 of the clamping plate 16 form a continuous surface. In this example, the surfaces 25, 28 are perpendicular.

In other words, the first portion 19a of the first flame path 19a, 19b is extended by the second portion 19b of the first flame path 19a, 19b in order to make it possible for the first flame path 19a, 19b to lead to the exterior of the explosion-proof housing 13.

The clamping plate 16 includes a central channel 21, through which the drive shaft 14 passes. A space 22 or clearance is provided between the drive shaft 14 and the clamping plate 16 in such a manner as to form a second flame path 22a.

The second flame path 22a completely surrounds the drive shaft 14. The second flame path 22a has a volume of annular cross-section. The second flame path 22a makes possible a fluidic connection between the interior of the explosion-proof housing 13 and the exterior, in such a manner as to discharge the pressure in case of an explosion inside the explosion-proof housing 13, while at the same time arresting the propagation of the flame.

The second space 22 forming the second flame path 22a is less than or equal to 0.5 mm and preferably less than or equal to 0.2 mm.

In the example of figure 2, the second space 22 or acceptable clearance is between 0.08 mm and 0.2 mm. The second flame path 22a has a length of 14.5 mm. The maximum length of the second flame path 22a is 25 mm for a second space 22 of 0.15 mm, as an example.

Figure 2 represents a particular embodiment in which the second flame path 22a is extended by a space 55, larger than the second space 22, making it possible to prevent the drive shaft 14 from contacting the clamping plate 16 due to the radial force exerted by the section pump 10 on the end of the drive shaft 14.

In other words, the tubular-shaped central channel 21 of the clamping plate 16 is extended by the larger truncated conical-shaped space 55. Other shapes are possible.

As shown in figures 2, 3 and 4, the upper portion 26 of the clamping plate 16 includes four equidistant holes 38 for the fastening the clamping plate 16 on the cover of the explosionproofhousing 13 by means of four screws 38a.

The suction pump 10 is fastened to the clamping plate 16 via a support 39, as shown in figure 5.

As shown in figures 4 and 5, the upper portion 26 of the clamping plate 16 includes four equidistant holes 40 for fastening the support 39 by means of four screws 41.

The suction pump 10 is fastened to the support 39 by two screws 42 on each side of the support 39.

According to figures 2 and 5, the suction pump 10 includes a rotating piston 43. The drive shaft 14 of the motor 11 includes a first front shaft portion 31 and a second rear shaft portion 32.

The rotating piston 43 of the suction pump 10 is connected to the first front shaft portion 31 of the motor via a ball joint 45. The motor 11 is connected to the first front shaft portion 31 in order to drive the suction pump 10. The rotating piston 43 simultaneously performs a rotational movement and a translational movement in order to deliver a dose of additive.

This type of suction pump 10 is known from the prior art. It is possible to use a piston pump as the one marketed by the company Fluid Metering Inc. This piston pump includes a ceramic piston and a ceramic liner, which are chemically inert with respect to the additives injected in the fuel.

According to the embodiment of figures 2 and 5, the motor 11 is fastened directly on the clamping plate 16 so as to be in contact with said clamping plate. More precisely, the motor 11 is fastened by means of screws 46 on the lower surface 49 of the circular lower portion 24 of the clamping plate 16. The screws 46 are inserted into holes (not shown) of the motor 11 in order to be screwed into threaded holes 48 provided in the circular lower portion 24 of the clamping plate 16.

As shown in figure 2, the motor 11 includes a second rear shaft portion 32 interacting with a position detector 36 in order to detect the angular position of the drive shaft 14. This makes it possible to return the rotating piston 43 to a determined stop position when it stops turning. This position detector 36 makes it possible to know the position of the drive shaft 14 and to verify whether it has performed a complete revolution for delivering a calibrated volume of additive. The position detector 36 can be an optical sensor, as shown in the example of figure 2, or a Hall-effect sensor or other sensor.

The position detector 36 is arranged at the rear of the motor 11 and it includes a disk 44 equipped with a slot embedded in the second rear shaft portion 32 of the motor 11. A transceiver assembly 51 is fastened at the rear of the motor 11 in order to detect the position of the slot. The rear of the motor 11 is covered by a cover 52 in order to protect the position detector 36 and the second rear shaft portion 32 of the motor 11.

The drive shaft 14 of the motor 11 is centered and guided by two bearings 53, 54.

As shown in figure 4, the second face 18 of the clamping plate 16 includes a centering pin 56 into which a centering hole provided in the support 39 is inserted. The centering pin 56 protrudes from the second face 18 of the clamping plate 16.

As shown in figure 3, the first face 17 of the clamping plate 16 includes a centering hole 58 into which a centering pin 59 provided on the motor 11 is inserted (figure 2).

According to an alternative embodiment (not shown), an intermediate support is provided between the motor and the clamping plate, which, in this case, is not in direct contact with the motor. The motor is then fastened on the intermediate clamping plate, which in turn is fastened on the clamping plate. The position detector is arranged between the motor and the clamping plate.

The explosion-proof housing 13 is a metal housing, preferably made of aluminum.

As shown in figure 7, the wall 15 of the explosion-proof housing 13 is a removable cover 15 resting on a bearing surface 29 of the explosion-proof housing 13, thus forming a third flame path 30.

The cover 15 is fastened on the explosion-proof housing 13 by, for example, ten screws 60, which are inserted in the holes 61 of the cover 15 and installed into threaded holes 62 provided in the explosion-proof housing 13.

As shown in figure 6, the explosion-proof housing 13 includes cable inlets or cable fittings 63, which make it possible to run electrical cables in a sealed manner with respect to the fuel vapors. Cable reducers 47 can be provided at the outlet of the cable glands 63 for running cables of a smaller diameter.

Alternatively, the wall 15 on which the injection units 12 are fastened could be one of the lateral or rear walls of the explosion-proof housing 13, not shown.

As an example, the explosion-proof housing 13 has an approximate length of 22 cm, a width of 14 cm, and a depth of 11.7 cm.

In this example, the suction pump 10 is a rotating piston pump, as described above, which delivers a dose of 0.1 mL of additive per revolution. The pump delivers a calibrated dose of additive in a precise manner, which makes it possible to distribute with a flow meter. The suction pump 10 is an ATEX pump in compliance with the European Directive 94/9/CE or 2014/34/EU concerning explosive environments. Consequently, it can be arranged in the hydraulic compartment 2 and outside of the explosion-proof housing 13, that is to say, in a zone where fuel vapors may potentially form.

Other types of pumps can also be used as volumetric pumps.

As shown in figures 1, 5 and 6, the suction pump 10 includes an additive inlet 65 connected to the additive reservoir 9, and an additive outlet 66 connected to the fuel distribution line 3.

The motor 11 is a step motor controlled by a control card 33 shown in figure 7.

According to figure 7, the control card 33 is arranged at the bottom 34 of the explosionproofhousing 13, so as to reduce the wiring and to obtain a compact arrangement. Another alternative would be to place the control card 33 in the hydraulic compartment, making it necessary to use an electrical cable extending from the hydraulic compartment to the interior of the explosion-proof housing 13.

The concentration of the additive in the fuel is predefined before the fuel transaction.

The flow meter 5, which is preferably a volumetric meter, measures the delivered fuel volume. It transmits a measurement signal to a computer housed in the hydraulic compartment 2, which calculates in real time the additive volume to be injected as a function of the volume of the distributed fuel. A control signal is then transmitted from the computer to the control card 33 of the additive injection device 8. This is reflected in a number of revolutions to be performed by the motor 11 of the injection unit 12. The motor 11 thus receives a control signal via the control card 33 for controlling the number of revolutions to be performed. The additive volume is thus proportional to the fuel volume.

As shown in figures 1 and 8, the additive injection device 8 includes a manual valve 67 and a filter 68 which are arranged between the additive reservoir 9 and the injection unit 12. The valve 67 can also be automatic. The filter 68 has the function of filtering the debris contained in the additive coming from the additive reservoir 9.

A non-return valve 69 (figure 1) is arranged between the injection unit 12 and the fuel distribution line 3. It makes it possible to stop excess pressure coming from the fuel distribution line 3 in order to protect the injection unit 12, and thus prevents the return of the fuel.

The additive injection device 8 can include several injection units 12, each associated with a respective fuel distribution line 3 and thus a respective nozzle 7.

According to the exemplary embodiment shown in figures 6 and 7, the additive injection device 8 includes four injection units 12 fastened on the cover 15 of the explosion-proof housing 13. The injection units 12 are arranged in staggered rows in order to make the additive injection device 8 as compact as possible.

As shown in figure 8, the additive injection device 8 is mounted in a first accommodation 80 provided in the hydraulic compartment 2 of the fuel distributor.

This first accommodation 80 is adjacent to that of a second accommodation 81 provided for receiving a fuel pump unit 4. This first accommodation 80 is defined by a first lateral wall 70a and by a second lateral wall 70b. This first lateral wall 70a includes a hole 71 for allowing access to the injection units 12 during a maintenance operation.

This lateral wall 70a is the wall located at the end of the hydraulic compartment 2, which is farthest from the electronic compartment 2 (figure 1).

According to the exemplary embodiment shown in figure 8, the additive injection device 8 includes two additive reservoirs 9 arranged in the first accommodation 80. The explosion-proof housing 13 is placed under the additive reservoirs 9 so as to form a vertical stack, which takes up the least space possible.

The outlet of the additive reservoir 64 (figure 1) is provided at the bottom of the additive reservoir 9, and the injection unit 12 is arranged below the additive reservoir 9, allowing flow of the additive by gravity, which avoids air bubbles in the additive and the use of a degassing system. This arrangement also makes it possible to reduce as much as possible the length of the pipes between the reservoir and the injection unit 12, which reduces the costs.

The second lateral wall 70b is L shaped. It is extended at the lower portion thereof by a reservoir support perpendicular to the rest of the second lateral wall 70b (not shown). The additive reservoirs 9 are placed on the reservoir support. The explosion-proof housing 13 is fastened to this reservoir support by means of a fastening element 72 in the general shape of an L, as shown in figure 7. The fastening element 72 is fastened on the rear face 73 of the explosion-proof housing 13. The fastening element 72 is also fastened to the reservoir support.

The cover 15 of the explosion-proof housing 13 includes a stand 74 fastened on the lower portion of the cover 15 in order to facilitate maintenance. In fact, each injection unit 12 includes a first bundle of electrical cables 75, which is connected to the position detector 36, and a second bundle of electrical cables 76, which is connected to the motor 11. These two bundles of electrical cables 75, 76, shown in figure 5, are also connected to the control card 33. During a maintenance operation to replace a suction pump 10, it is possible to remove the explosion-proof housing 13, while leaving the cover 15 in place with the pumps connected to the reservoirs. The stand 74 makes it possible to place the cover 15 on a support in order to relieve the pipes of the weight of the cover 15 and of the injection units 12.

As shown in figure 8, each injection unit 12 is connected to an additive reservoir 9 via a first hose 77a connected to a first manifold 78, which in turn is connected to the additive reservoir 9. The first manifold 78 can be connected to two injection units 12 via two separate first hoses 77a. The additive injection device 8 is thus capable of delivering the same additive in two respective fuel-distribution lines 3 connected to two different nozzles 7 arranged on each side of the fuel distributor 1.

The elements connecting the additive reservoir, located on the left of figure 8, to the other injection units 12 have are not shown in order to simplify the figure.

Each injection unit 12 is connected to a second manifold (not shown) via a second hose 77b. The second manifold is connected to the fuel distribution line 3.

Figure 8 also shows the electrical cables 79 coming out of the cable fittings 63 of the explosion-proof housing 13. These electrical cables 79 are connected to the computer located in the hydraulic compartment 2.

2016340366 18 Oct 2018

Claims

1. A fuel dispenser (1) comprising a hydraulic compartment (2) comprising on one hand at least one pumping unit (4) connected to at least one fuel supplying line (3) comprising a flow meter (5) and a flexible hose (6) equipped with a nozzle (7) and, on the other hand, at least one additive injection device (8) comprising an additive tank (9) and at least one injection unit (12) for sucking a regulated quantity of additive from the additive tank (9) to the fuel supplying line (3), said injection unit (12) comprising a sucking pump (10) driven by a motor (11), characterized in that:

the additive injection device (8) comprises an explosion-proof enclosure (13) wherein the motor (11) is located, the suction pump (10) being mounted outside the explosion-proof enclosure (13), the suction pump (10) being driven by the motor (11) via a drive shaft (14) passing through a wall (15) of the explosion-proof enclosure (13), the suction pump (10) and the motor (11) being separated by this wall (15).

2. The fuel dispenser (1) according to claim 1, characterized in that the injection unit (12) comprises a flange (16) fixed on the wall (15) of the explosion-proof enclosure (13) and covering an opening (20) formed in this wall (15), the motor (11) being fixed on a first face (17) of the flange (16) and the suction pump (10) being fixed on a second face (18) of the flange (16) opposite to the first face (17), the drive shaft (14) passing through the flange (16) for connecting the motor (11) to the suction pump (10), a first flame path (19a, 19b) being provided between the flange (16) and the wall (15).

3. The fuel dispenser (1) according to claim 2, characterized in that the opening (20) of the wall (15) of the explosion-proof enclosure (13) is delimited by a peripheral surface (23), the flange (16) comprising a circular lower part (24) having a peripheral surface (25) facing the peripheral surface (23) of the opening (20) of the wall (15) of the explosion-proof enclosure (13) and separated therefrom by a gap (37) forming a first portion (19a) of the first flame path (19a, 19b).

2016340366 18 Oct 2018

4. The fuel dispenser (1) according to claim 3, characterized in that the space (37) forming the first portion (19a) of the first flame path is less than or equal to 0.5 mm and is preferably less than or equal to 0.15 mm.

5. The fuel dispenser (1) according to any one of claims 2 to 4, characterized in that the flange (16) comprises an upper portion (26) extending radially relative to the circular lower portion (24), the upper portion (26) having a peripheral bearing surface (28) in contact with an outer surface (27) of the wall (15) of the explosion-proof enclosure (13), a second portion (19b) of the first flame path (19a, 19b) being formed between these surfaces.

6. The fuel dispenser (1) according to any one of claims 2 to 5, characterized in that the flange (16) comprises a central channel (21) crossed by the drive shaft (14), a second space (22) being provided between the drive shaft (14) and the flange (16) so that forming a second flame path (22a).

7. The fuel dispenser (1) according to claim 6, characterized in that the second space (22) forming the second flame path (22a) is less than or equal to 0.5 mm and is preferably less than or equal to 0.2 mm.

8. The fuel dispenser (1) according to claim 6 or 7, characterized in that the wall (15) of the explosion-proof enclosure (13) is a removable cover resting on a bearing surface (29) of this explosion-proof enclosure (13), forming a third flame path (30).

9. The fuel dispenser (1) according to any one of claims 2 to 8, characterized in that the motor (11) is fixed directly to the flange (16) so as to be in contact therewith, the motor (11) driving a first front axle portion (31) for driving the suction pump (10) and a second rear axle portion (32) cooperating with a position detector (36) positioned at the rear of the motor (11).

10. The fuel dispenser (1) according to any one of claims 1 to 9, characterized in that the pumping unit (4) is connected to two fuel distribution lines (3) each having a flow meter (5) and a flexible hose (6) equipped with a nozzle (7), the injection device additive (8) comprising two injection units (12) connected to the additive tank (9), said injection units

2016340366 18 Oct 2018 (12) being each connected to a respective fuel distribution line (3), the additive injection device (8) comprising a control card (33) for controlling the motors (11) disposed in the bottom (34) of the explosion-proof enclosure (13).

11. The fuel dispenser (1) according to any one of claims 1 to 10, characterized in that the explosion-proof enclosure (13) is placed under the additive tank (9), so as to form a vertical stack, the additive tank (9) comprising an outlet (64) at its lower end connected to the unit injection (12) and said additive injection device (8) being placed at the end of the hydraulic compartment (2) in a first enclosure (80) delimited by a first lateral wall (70a) and by a second side wall (70b) extended at its bottom by a tank support perpendicular to the remainder of the second side wall (70b), the explosion-proof enclosure (13) being attached to the tank support by means of a fastener (72).