CN213557789U

CN213557789U - Double-flow-passage structure and spray gun

Info

Publication number: CN213557789U
Application number: CN202021835890.5U
Authority: CN
Inventors: 王银江; 王海洋
Original assignee: Ningbo Jianghui Electrical Technology Co ltd
Current assignee: Ningbo Jianghui Electrical Technology Co ltd
Priority date: 2020-07-07
Filing date: 2020-08-28
Publication date: 2021-06-29
Anticipated expiration: 2030-08-28
Also published as: CN112170036A; WO2022042710A1

Abstract

The utility model discloses a double-flow-passage structure, inlet channel including the rifle body, the gas outlet of setting at the rifle body front end, the gas outlet includes first export (1) and second export (2), first export (1) and second export (2) mutual isolation, inlet channel is divided into first inlet channel (6) and second inlet channel (7) of mutual isolation by isolation structure along inlet channel's axial, first inlet channel (6) and second inlet channel (7) communicate with inlet channel's air inlet (32) respectively, first inlet channel (6) and first export (1) intercommunication form first runner, second inlet channel (7) and second export (2) intercommunication form the second runner, first runner is equipped with the valve, the advantage is: the mutual influence between two paths of air flows is favorably reduced, in addition, the adjustment of the air injection amount does not need to depend on the ventilation amount of the other path, the arrangement of the valve is more flexible, and the design of an air flow passage is favorably realized; a spray gun is also provided, which adopts the double-channel structure.

Description

Double-flow-passage structure and spray gun

Technical Field

The utility model relates to a spray gun technical field especially relates to a double flow channel structure and spray gun.

Background

There is a spray gun, and its nozzle includes first gas nozzle, second gas nozzle and liquid spout, and the liquid spout is located the middle part, and first gas nozzle is located the circumference of second gas nozzle, and the circumference that the second gas nozzle is located the liquid spout, and the liquid spout spun simultaneously, through the jet-propelled of first gas nozzle, second gas nozzle, just can form spraying and spraying shape, and this is exactly the theory of operation of this type of spray gun.

In order to obtain two gas nozzles and control the air injection quantity of a certain path, the prior art adopts a way of dividing the second gas nozzle to obtain the air injection of the first gas nozzle, such as the technical scheme disclosed by the electric spray gun of the Chinese utility model with the publication number of CN 208098421U: the gas flow gun comprises a gun body (1), a nozzle (3) arranged on a front port of the gun body (1) and a flow cap (4), wherein a first air flow hole (41) (namely a first gas nozzle) is formed in the flow cap (4); the method is characterized in that: a through hole is arranged in the middle of the flow cap, the nozzle (3) is accommodated in the through hole, a gap is reserved between the nozzle and the side wall of the through hole, and a second air flow hole (42) (namely a second air nozzle) is formed in the gap; the side wall of the gun body (1) is provided with an annular groove with an opening facing the flow cap (4), and the annular groove forms a first air flow channel (11); the gun body (1) is provided with a cavity (13), a core body (5) is arranged in the cavity (13), and a liquid channel (51) communicated with the nozzle (3) is arranged on the core body (5); a gap between the core body (5) and the cavity (13) forms a second air flow channel (12), and the second air flow channel (12) is communicated with the second air flow hole (42); the first gas flow channel (11), the second gas flow channel (12) and the liquid channel are isolated from each other; the gun body (1) is also provided with a valve (6) for communicating the first air flow channel (11) and the second air flow channel (12). It can be known from the whole patent, the air flow of the first air flow channel (11) is divided into two paths from the second air flow channel (12) through the valve (6), although the structure solves the problem of air source of the first air flow channel (11) and the problem of adjusting the air injection amount, the two paths of air flows have certain influence each other, the division position is close to one side of the nozzle, the influence is more obvious, in addition, the adjustment of the air injection amount still depends on the ventilation amount of the second air flow channel (12), how to conveniently take air from the second air flow channel (12) needs to be considered in the setting of the valve (6), the setting of the valve (6) forms a limitation, in order to take air from the second air flow channel (12), the limitation on the design of the air flow channel is avoided, and the improvement of the smoothness of the air flow channel is not facilitated.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems in the prior art, a double-flow-channel structure is provided, which is beneficial to reducing the mutual influence between two paths of air flows, in addition, the adjustment of the air injection amount does not need to depend on the ventilation amount of the other path, the arrangement of a valve is more flexible, and the design of an air flow channel is facilitated; a spray gun is also provided, which adopts the double-channel structure.

The specific technical scheme is as follows:

the utility model provides a double-flow-passage structure, including the inlet channel of the rifle body, the gas outlet of setting at the rifle body front end, the gas outlet includes first export and second export, first export and second export are kept apart each other, inlet channel is divided into the first inlet channel and the second inlet channel of mutual isolation by isolation structure along inlet channel's axial, first inlet channel and second inlet channel communicate with inlet channel's air inlet respectively, first inlet channel and first export intercommunication form first runner, second inlet channel and second export intercommunication form the second runner, first runner is equipped with the valve.

The beneficial effects of the above technical scheme are that:

because inlet channel is divided into first inlet channel and the second inlet channel of mutual isolation by isolation structure along inlet channel's axial, gas all comes from inlet channel's air inlet, so be favorable to reducing the influence each other between two way air currents, in addition, the regulation of jet-propelled volume need not to rely on the air output of another way, owing to need not to consider to get gas from another way, so the setting of valve is comparatively nimble, in theory, all set up on first runner can, owing to need not to consider to get gas from another way, so be favorable to the design of gas flow channel, in addition, inlet channel is divided into first inlet channel and the second inlet channel of mutual isolation by isolation structure along inlet channel's axial, so the runner is optimized, be favorable to the promotion of gas flow channel patency.

The preferred, isolation structure adopts the division board, and this division board sets up along the rifle body axial, and this simple structure is compact, and is few to inlet channel's occupation space, and in addition, this structure is favorable to obtaining with the integrative injection moulding of the casing of the rifle body, consequently is convenient for make.

Preferably, the partition plate is of a V-shaped structure or an arc-shaped structure, so that the space of the air inlet channel is favorably distributed, and the ventilation volume of the first air inlet channel and the second air inlet channel is optimized.

Preferably, the lateral wall of the gun body is provided with a transverse opening, the transverse opening is intersected with the first flow channel, and the valve is installed on the transverse opening, so that the structure is compact, and the design of the smoothness of the flow channel is facilitated.

The preferred, the valve includes the knob, knob seat and case, the knob seat inserts fixed connection in horizontal trompil, the case rotates with the knob seat and cup joints the cooperation, and case and knob fixed connection, the knob seat is equipped with the intercommunicating pore, the intercommunicating pore is used for communicateing first flow channel, the case is used for adjusting the range of opening of intercommunicating pore, moreover, the steam generator is simple and compact in structure, and convenient for assembly can insert fixed connection in horizontal trompil with the knob seat after knob, knob seat and the three of case are connected earlier, thereby accomplish the assembly, be favorable to the design of the unobstructed degree of runner in addition.

Preferably, the intersection of the transverse opening and the first flow channel is provided with an axial air inlet hole and a transverse air inlet hole which are used for air inlet of the valve, and the axial air inlet hole and the transverse air inlet hole form a total air inlet, so that the air inlet is larger, and the smoothness of the flow channel is improved.

Preferably, a mounting surface is arranged on one side, facing the transverse opening, of the central shaft of the gun body, a sealing surface is arranged on the left side of the mounting surface, after the knob seat is inserted and fixedly connected into the transverse opening, the inner side end face of the knob seat is abutted against the mounting surface and the sealing surface, a transverse air inlet hole is formed between the mounting surface and the inner side end face, a through hole in the right side of the knob seat serves as an axial air inlet hole, the transverse air inlet hole is communicated with the inside of the knob seat all the time, the rotary sealing part of the valve core is used for adjusting the opening range of the through hole in the left side of the knob seat, and in the process of rotationally adjusting the opening range of the through hole in the left side of the knob seat through.

Preferably, the central shaft of the gun body is communicated with a liquid outlet of a liquid storage tank of the spray gun, the liquid storage tank is further communicated with the first air inlet channel or/and the second air inlet channel, and the first air inlet channel or/and the second air inlet channel are/is used for pressurizing the liquid storage tank, so that the structure is compact, the liquid storage tank can be pressurized reliably, and the pressurizing effect is good.

The utility model also provides a spray gun, including first gas nozzle, second gas nozzle and liquid spout, the liquid spout is located the middle part, and first gas nozzle is located the circumference of second gas nozzle, and second gas nozzle is located the circumference of liquid spout, is equipped with double-flow-passage structure, double-flow-passage structure's first runner and first gas nozzle intercommunication, double-flow-passage structure's second runner and second gas nozzle intercommunication.

The beneficial effects of the above technical scheme are that:

the mutual influence between two paths of nozzles is favorably reduced, the control precision of air injection is improved, and the spraying effect is better.

The hand-held type electric spray gun has the advantages that the hand-held type electric spray gun is formed by connecting the electric gas supply structure with the gun body, the gas inlet of the gas inlet channel of the double-channel structure is communicated with the output end of the electric gas supply structure, the structure is compact, the hand-held type use is realized, the gas source is supplied by the electric gas supply structure instead of being connected with other gas sources during use, the gas supply requirement is greatly simplified, and the hand-held type electric spray gun is convenient to use.

Drawings

Fig. 1 is a front view of the gun body.

Fig. 2 is a perspective view of fig. 1 with the nozzle portion and valve removed.

FIG. 3 is one of the schematic perspective views of FIG. 1 with the nozzle portion and valve removed (the knob holder not removed).

FIG. 4 is a second perspective view of the nozzle portion and valve of FIG. 1 with the nozzle portion and valve removed (knob holder not removed).

FIG. 5 is a left side view of FIG. 1 with the nozzle portion and valve removed.

FIG. 6 is a right side view of FIG. 1 with the nozzle portion and valve removed.

Fig. 7 is a sectional view taken along line a-a of fig. 6.

Fig. 8 is a top view of fig. 1.

Fig. 9 is a sectional view taken along line B-B of fig. 8.

Fig. 10 is a perspective view of an inner race of the nozzle portion.

Fig. 11 is a perspective view of an outer ring of the nozzle portion.

FIG. 12 is a perspective view of the inner and outer races axially assembled together.

Fig. 13 is a perspective view of the knob and valve cartridge.

Fig. 14 is a perspective view of the knob holder.

Fig. 15 is one of the three schematic perspective views of the knob, knob seat and valve core assembled together.

Fig. 16 is a second perspective view of the knob, knob seat and valve core assembled together.

Fig. 17 is a front view of a spray gun.

Description of reference numerals: 1. the gas valve comprises a first outlet, a second outlet, a first gas nozzle, a second gas nozzle, a liquid outlet, a liquid inlet, a liquid outlet, a liquid inlet, a central, Rear end, 39, screw holes, 40, inner end face, 41, handle, 42, battery box, 43, right side through hole.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purposes of limitation.

The utility model relates to a as shown in fig. 2 to 9, a double flow path structure, inlet channel including the rifle body, the gas outlet of setting at the rifle body front end, the gas outlet includes first export 1 and second export 2, first export 1 and second export 2 mutual isolation, inlet channel is divided into first inlet channel 6 and the second inlet channel 7 of mutual isolation by isolation structure along inlet channel's axial, first inlet channel 6 and second inlet channel 7 communicate with inlet channel's air inlet 32 respectively, first inlet channel 6 forms first runner with first export 1 intercommunication, second inlet channel 7 forms the second runner with second export 2 intercommunication, first runner is equipped with the valve. In this case, for better distribution of the gas flow, the first outlet 1 and the second outlet 2 are each designed as annular holes, which, for optimizing the distribution of the first outlet 1 and the second outlet 2, facilitate communication with the nozzle, the first outlet 1 being arranged circumferentially along the second outlet 2.

As shown in fig. 3 and 6, the isolation structure adopts an isolation plate 8, and the isolation plate 8 is arranged along the axial direction of the gun body. In this example, the partition plate 8 has a V-shaped or arc-shaped configuration. In this case a V-shaped configuration.

As shown in fig. 1 to 4, the side wall of the gun body is provided with a transverse opening 9, the transverse opening 9 intersects with the first flow passage, and the transverse opening 9 is provided with a valve.

As shown in fig. 2, 3 and fig. 13 to 16, the valve includes a knob 10, a knob seat 11 and a valve core 12, the knob seat 11 is inserted and fixedly connected in the transverse opening 9, the valve core 12 is rotatably sleeved and matched with the knob seat 11, the rear end 38 of the valve core 12 passes through the knob seat 11 and then is fixedly connected with the knob 10, the knob seat 11 is provided with a communication hole for communicating a first flow passage, and the valve core 12 is used for adjusting the opening range of the communication hole. The valve can be installed by firstly assembling the knob 10, the knob seat 11 and the valve core 12, and then inserting and fixing the knob, the knob seat and the valve core into the transverse opening 9, in this case, the insertion and fixing adopt a matching structure of a clamping hook 13 and a clamping groove 14, the left side and the right side of the knob seat 11 are respectively provided with the clamping hook 13, and the corresponding transverse opening 9 is provided with the clamping groove 14. The valve core 12 is fixedly connected with the knob 10 and can be fixed by screws, namely, the screws are inserted into the screw holes 39 to connect the rear end 38 of the valve core 12 with the knob 10, and meanwhile, the knob seat 11 is provided with the annular table board 15, so that the valve core 12 is supported in a matched manner, the rotary sealing part 21 of the valve core 12 is well matched in the knob seat 11, certain sealing effect can be realized by the matching of the annular table board 15 and the valve core 12, and the air flow in the knob seat 11 is prevented from leaking towards one side of the knob 10.

As shown in fig. 2, the intersection of the transverse opening 9 and the first flow passage is provided with an axial inlet hole 16 and a transverse inlet hole 17 for valve inlet air.

As shown in fig. 2 to 4, a mounting surface 19 is disposed on one side of the central shaft 18 of the gun body facing the transverse opening 9, a sealing surface 20 is disposed on the left side of the mounting surface 19, after the knob seat 11 is inserted and fixedly connected in the transverse opening 9, an inner side end surface 40 of the knob seat 11 is abutted against the mounting surface 19 and the sealing surface 20, a transverse air inlet hole 17 is disposed between the mounting surface 19 and the inner side end surface 40, a right through hole 43 of the knob seat 11 serves as an axial air inlet hole 16, the transverse air inlet hole 17 is always communicated with the inside of the knob seat 11, a rotary sealing portion 21 of the valve core 12 is used for adjusting the opening range of a left through hole 22 of the knob seat 11, and the valve structure can.

As shown in fig. 7 and 9, the central shaft 18 of the gun body is communicated with a liquid outlet of a liquid storage tank 23 of the spray gun, the liquid storage tank 23 is also communicated with a first air inlet channel 6 or/and a second air inlet channel 7, and the first air inlet channel 6 or/and the second air inlet channel 7 are/is used for pressurizing the liquid storage tank 23. In this embodiment, the gun body is provided with a vertical portion 34, a connecting portion is provided at a lower side of the gun body located at the vertical portion 34, the connecting portion is used for connecting the liquid storage tank 23, an upper end of the vertical portion 34 is communicated with the central shaft 18, a lower end of the vertical portion 34 is communicated with the connecting portion through the liquid outlet flow passage 24, the structure is that the liquid storage tank 23 and the gun body are directly connected together through the connecting portion, and the liquid storage tank 23 and the gun body can be separated from each other. In this example, the second intake passage 7 is used to pressurize the reservoir tank 23 with respect to pressurizing the reservoir tank 23, and specifically, the connection portion is provided with a pressurizing flow passage 25, and the pressurizing flow passage 25 communicates with the second intake passage 7. The central shaft 18 is provided with a needle 27, which needle 27 is used to open or close the liquid nozzle orifice 5. The motion of needle 27 is realized by adjustment handle 28 operation, in order to avoid gas leakage, simplify sealed setting, the internal horizontal portion 33 that still is equipped with of rifle, the regulating spindle of adjustment handle 28 passes horizontal portion 33 and needle 27, the both ends of regulating spindle are connected with the waist shape hole of adjustment handle 28, pull adjustment handle 28 and can utilize waist shape hole to drive the whole axial translation of regulating spindle, the whole axial translation of regulating spindle drives needle 27 axial displacement, thereby realize opening or closing liquid spout 5 and control the opening range of liquid spout 5. In this embodiment, the transverse portion 33 and the housing of the gun body are integrally formed by injection molding, so that the transverse portion 33 and the air inlet channel are sealed and isolated, and similarly, the vertical portion 34 and the housing of the gun body are also integrally formed by injection molding, which is beneficial for sealing.

The gun body shown in fig. 1, 8 and 9 is obtained by mounting the nozzle on the structure.

As shown in fig. 17, a spray gun includes a first gas nozzle 3, a second gas nozzle 4 and a liquid nozzle 5, the liquid nozzle 5 is located in the middle, the first gas nozzle 3 is located in the circumferential direction of the second gas nozzle 4, the second gas nozzle 4 is located in the circumferential direction of the liquid nozzle 5, the dual-channel structure is provided, a first channel of the dual-channel structure is communicated with the first gas nozzle 3, and a second channel of the dual-channel structure is communicated with the second gas nozzle 4.

Specifically, as shown in fig. 1 and 8 to 12, a nozzle is installed at the front end of the gun body, the nozzle is composed of an inner ring and an outer ring, the inner ring and the front end of the gun body are axially and sequentially sleeved and matched, the nozzle is installed at the front end of the gun body by using a nut 30, the outer ring can rotate relative to the inner ring by using the elasticity of materials, and is provided with four gear grooves 35, so that the outer ring can be accurately positioned when rotating relative to the inner ring, and the four gear grooves 35 are distributed in a cross shape. The outer ring is provided with a first gas jet 3 and a second gas jet 4, which simplifies the structure. The two first gas nozzles 3 are a group, and the two first gas nozzles are two groups in total and are uniformly distributed in the circumferential direction. The second gas nozzle 4 is positioned in the middle through hole of the outer ring, and the structure of the second gas nozzle 4 is an annular spacing hole between the nozzle of the liquid nozzle 5 in the middle of the inner ring and the middle through hole of the outer ring.

In order to guide the gas flow into the first gas nozzle 3 and the second gas nozzle 4, the inner ring is provided with a first vent groove 36 and a second vent groove 37, and the first vent groove 36 and the second vent groove 37 are both annular vent grooves.

As shown in fig. 17, the spray gun of this embodiment is detachably connected with a spray gun electric gas supply structure 26, the electric gas supply structure 26 is connected with the gun body to form a handheld electric spray gun, and the gas inlet 32 of the gas inlet channel of the double-channel structure is communicated with the output end of the electric gas supply structure 26.

The electric gas supply structure 26 forms gas flow for supplying gas through structures such as an electric motor and an impeller, the electric gas supply structure 26 is provided with a handle 41, the handle 41 is provided with a switch button 29, the switch button 29 is positioned on the right side of the adjusting handle 28, the adjusting handle 28 is operated to the right, the adjusting handle 28 presses the switch button 29, the switch button 29 is switched on to enable the electric motor to work, therefore, when the spray gun works, the electric motor can work through the adjusting handle 28, the opening range of the valve needle 27 can be adjusted, a linkage function is formed, and the use of the spray gun is greatly facilitated.

To further remove the use restriction, the spray gun is powered by batteries, and a battery compartment 42 is provided at the lower end of the handle 41.

While the gas source is exemplified above as being supplied by the electrically powered gas supply structure 26, the gas source may be other structures, such as compressed gas.

The liquid storage tank 23 in the above example is a pressurized liquid supply structure, and may be a gravity liquid supply structure or both the gravity liquid supply structure and the pressurized liquid supply structure. The gravity liquid supply structure is as follows: the liquid storage tank 23 is inverted, and the liquid automatically flows into the liquid nozzle 5 by using gravity. The gravity liquid supply structure and the pressure liquid supply structure both refer to: the reservoir 23 is not only inverted but also pressurized with respect to the reservoir 23. The structure is all suitable for the utility model discloses.

The utility model discloses an ingenious design realizes the design of double flow way, reduces the influence each other between two tunnel airflows, and in addition, the regulation of jet-propelled volume need not to rely on the air flow on another way, and the setting of valve is comparatively nimble, is favorable to the design of gas flow way, the utility model discloses make the spray gun better use.

The present invention has been described in an illustrative manner, and is not to be construed as limited by the claims. The present invention is not limited to the above embodiments, and the specific structure thereof allows for changes, all the changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a double-flow-passage structure, including the inlet channel of the rifle body, the gas outlet of setting at the rifle body front end, the gas outlet includes first export (1) and second export (2), first export (1) and second export (2) are kept apart each other, a serial communication port, inlet channel is divided into first inlet channel (6) and second inlet channel (7) that keep apart each other by isolation structure along inlet channel's axial, first inlet channel (6) and second inlet channel (7) communicate with inlet channel's air inlet (32) respectively, first inlet channel (6) and first export (1) intercommunication form first runner, second inlet channel (7) and second export (2) intercommunication form the second runner, first runner is equipped with the valve.

2. The double flow structure as claimed in claim 1, wherein the spacer structure is a spacer plate (8), the spacer plate (8) being arranged axially of the gun body.

3. The double flow structure as claimed in claim 2, characterised in that the partition plate (8) is of a V-shaped or arcuate configuration.

4. A dual flow passage arrangement as claimed in claim 1, wherein the side walls of the lance are provided with transverse openings (9), the transverse openings (9) intersecting the first flow passage, the transverse openings (9) mounting the valve.

5. A double flow channel structure as claimed in claim 4, wherein the valve comprises a knob (10), a knob seat (11) and a valve core (12), the knob seat (11) is inserted and fixedly connected in the transverse opening (9), the valve core (12) is rotatably sleeved and matched with the knob seat (11), the valve core (12) is fixedly connected with the knob (10), the knob seat (11) is provided with a communication hole for communicating the first flow channel, and the valve core (12) is used for adjusting the opening amplitude of the communication hole.

6. A dual flow channel structure as claimed in claim 4 or 5, characterised in that the intersection of the transverse opening (9) with the first flow channel is provided with axial inlet holes (16) and transverse inlet holes (17) for valve inlet air.

7. The double-flow-passage structure as claimed in claim 6, wherein a mounting surface (19) is provided on one side of the central shaft (18) of the gun body facing the transverse opening (9), a sealing surface (20) is provided on the left side of the mounting surface (19), after the knob seat (11) is inserted and fixedly connected in the transverse opening (9), the inner side end surface (40) of the knob seat (11) is abutted against the mounting surface (19) and the sealing surface (20), a transverse air inlet hole (17) is provided between the mounting surface (19) and the inner side end surface (40), a right through hole (43) of the knob seat (11) serves as an axial air inlet hole (16), the transverse air inlet hole (17) is always communicated with the inside of the knob seat (11), and the rotary sealing portion (21) of the valve core (12) is used for adjusting the opening range of the left through hole (22) of the knob seat (11.

8. The double-flow arrangement as claimed in claim 1 or 7, characterized in that the central axis (18) of the lance is in communication with the outlet of a reservoir (23) of the lance, the reservoir (23) also being in communication with the first inlet channel (6) or/and the second inlet channel (7), the first inlet channel (6) or/and the second inlet channel (7) being used to pressurize the reservoir (23).

9. A spray gun comprising a first gas nozzle (3), a second gas nozzle (4) and a liquid nozzle (5), the liquid nozzle (5) being located in the middle, the first gas nozzle (3) being located in the circumferential direction of the second gas nozzle (4), the second gas nozzle (4) being located in the circumferential direction of the liquid nozzle (5), characterized in that a dual flow channel structure according to any of claims 1 to 8 is provided, the first flow channel of the dual flow channel structure being in communication with the first gas nozzle (3), and the second flow channel of the dual flow channel structure being in communication with the second gas nozzle (4).

10. The spray gun of claim 9 further comprising an electrogas supply structure (26), the electrogas supply structure (26) being connected to the gun body to form a hand-held electric spray gun, the inlet port (32) of the inlet passage of the dual-flow structure being in communication with the output port of the electrogas supply structure (26).