SOUND MODEL DEVICE FOR FIREARMS AND FIREARMS CONTAINING SUCH A DEVICE

Abstract

SOUND MODEL DEVICE FOR FIREARMS AND FIREARMS CONTAINING SUCH A DEVICE. The invention relates to a sound moderator device for firearms, comprising: a first chamber (31) defining a central passage, the first chamber (31) comprising a plurality of gas-slowing elements (5); at least a second chamber defining a downstream external passage arranged around the central passage and extending between an inlet communicating with the first chamber (31) and an outlet opening to the outside. The downstream external passage is defined by a Tesla valve-type structure (7) whose two ends are respectively connected to a vent (6) formed between the inlet and the first chamber (31), upstream of the plurality of gas-slowing elements (5), and to at least one exhaust hole formed between the outlet and the outside. Figure to be published with the abstract: Figure 4.

Description

Title of the invention: SOUND MODERATOR DEVICE FOR FIREARMS AND GUNS FIRE CONTAINING SUCH A DEVICE

[0001] The technical field of the invention is that of medium or small caliber firearms.

[0002] The present invention relates to a sound moderator or noise reducer device, commonly called a silencer, intended to be associated with a firearm, as well as a firearm comprising such a sound moderator device.

[0003] It is well known to use a silencer, mounted on the end of a firearm, in order to reduce the recoil of the weapon and to reduce and attenuate the sound effect caused by the percussion and sudden release of the compressed gases used to project the projectile.

[0004] A silencer is generally formed of a cylindrical body, one end of which is adaptable to the muzzle of the weapon's barrel, the interior of the body constituting a gas decompression chamber and being provided with baffles, or other deflection elements, slowing down the flow of gases while providing a passage for the exit of the projectile.

[0005] A silencer is known from US patent US11686547. This silencer comprises a substantially cylindrical internal chamber oriented longitudinally around the firing axis of a projectile. This internal chamber has baffles configured to dampen the pressure waves responsible for the sound peak perceived by the human ear. Such baffles also have the technical effect of limiting the recoil of the weapon, similar to the effect produced conventionally by a muzzle brake. This silencer further comprises a substantially cylindrical external chamber, coaxial with the internal chamber and connected to it by a series of vents. This external chamber has vanes forming a network of obstacles that dampen the flow of firing gases passing between the internal and external chambers.

[0006] Such a silencer offers a certain efficiency that can be optimized. Moreover, it is always desirable to further improve the performance of a silencer.

[0007] Moreover, it is understood that such a silencer is particularly expensive to produce due to the complexity of its structure.

[0008] The invention aims to solve these problems by proposing an alternative to the silencer disclosed in US patent 11686547, which alternative further improves the noise reduction performance of such a silencer by specializing the role of the external chamber around noise reduction, while the internal chamber is classically dedicated to reducing weapon recoil, while being relatively simple, and therefore inexpensive, to produce.

[0009] The solution is based primarily on replacing the vane array of US patent 11686547 with at least one Tesla valve-type structure, preferably a plurality of Tesla valve-type structures, to which the noise reduction function is assigned. The Tesla valve has a well-documented effect in the technical literature of reducing the flow rate of a fluid through backflow effects. This phenomenon allows for a gradual expansion of the gases, which notably prevents the formation of supersonic sound waves.

[0010] The invention thus relates to a sound moderator device for a firearm, comprising:

[0011] - a first chamber delimiting a central passage extending longitudinally along a central axis and through which a main flow of firing gas is intended to pass, the central passage extending between a proximal end intended to communicate upstream with a muzzle of a weapon and a distal end opening downstream to the outside, the first chamber comprising a plurality of elements for slowing down the gases of said main flow; and - at least one second chamber delimiting a downstream external passage arranged around the central passage and in which a secondary flow of firing gases is intended to pass, the downstream external passage extending between an inlet in fluid communication with the first chamber and an outlet opening onto the outside;

[0012] characterized by the fact that, for the or each of the at least one second chamber, the downstream external passage is defined by a Tesla valve type structure configured to allow the braking of said secondary flow gases, the two ends of the Tesla valve type structure being respectively connected to a vent provided between the inlet and the first chamber, upstream of the plurality of slowing elements, and to at least one exhaust hole provided between the outlet and the outside.

[0013] By replacing the prior art vane array disclosed in US patent 11686547 with at least one Tesla valve-type structure, the present invention improves the efficiency of the sound moderator device. The second chamber is dedicated to noise reduction, while the first chamber is conventionally used to reduce weapon recoil. As is known, the Tesla valve reduces the flow rate of a fluid through backflow effects, a phenomenon that allows for a gradual expansion of the gases, thus preventing the formation of supersonic sound waves. Furthermore, due to its geometry, the structure according to the invention is simpler to manufacture, thereby reducing production costs. Another advantage of the Tesla valve is that this passive non-return valve has no moving parts and therefore has a long service life.

[0014] In a particular embodiment, the first chamber is defined inside a central body, at least a second chamber is defined inside a cap body surrounding the central body at least from the proximal end to the distal end and extending coaxially to the central axis, the central body having a lateral wall and at least one vent being formed through said lateral wall on the proximal end side.

[0015] Advantageously, the device further comprises a fixing body having a downstream end coupled to and opening into the proximal end of the central body and an upstream end intended to be coupled to a muzzle of a weapon, the fixing body being a hollow body defining, between the upstream and downstream ends, an inlet chamber extending longitudinally along the central axis.

[0016] For example, the fixing body and the central body can be coupled by threading.

[0017] Advantageously, the central body, the cap body and the fastening body are separate rooms.

[0018] Preferably, for the or each of the at least one second chamber, the Tesla valve type structure is supported by the side wall of the central body.

[0019] Advantageously, each of the central body and the cap body comprises a cylindrical side wall with a circular cross-section.

[0020] Advantageously, the cap body further comprises, at its distal end, an annular end wall, arranged in a plane transverse to the central axis, said end wall being pierced with a central hole, in its center, to allow an axial passage to the main flow, and being pierced along the at least one exhaust hole on its circular periphery, to allow the exit of gases from at least one secondary flow from at least one Tesla valve type structure.

[0021] Advantageously, the plurality of gas slowing elements of said main flow are baffles arranged along the central axis, each baffle comprising a frustoconical wall extending towards the proximal end and integral with an inner surface of the lateral wall of the central body and a cylindrical wall delimiting a central opening, the central openings of the baffles defining a projectile path along the central axis.

[0022] In particular, the plurality of gas slowing elements of said main flow may be four baffles arranged in sequence along the central axis.

[0023] Preferably, the device comprises a plurality of second chambers, each having a Tesla valve-type structure, such as for example eight second chambers and eight Tesla valve-type structures.

[0024] Advantageously, Tesla valve-type structures are regularly distributed angularly around the central axis.

[0025] Preferably, the Tesla valve-type structure or structures comprise a main channel configured to follow a zigzag path between the associated vent and at least one associated exhaust hole, and a plurality of secondary channels, each secondary channel having an inlet connected to the main channel in the extension of a straight section of the zigzag path and an outlet opening into a subsequent adjacent straight section of the main channel and being configured to follow a curved path having a concavity facing towards the straight section located between the inlet and the outlet and a convexity oriented towards the outlet of the structure opening to the outside.With such an arrangement of the main channel and secondary channels, the secondary flow entering the Tesla valve-type structure(s) is divided, at each secondary channel inlet, into a main flow in the main channel and a secondary flow in the secondary channel, the secondary flow being deflected by the curvature in the curved path before rejoining the main flow at each secondary channel outlet, thus reducing the secondary flow rate.

[0026] Advantageously, the curved path is defined between a bucket-shaped wall allowing a 180-degree turn of the secondary current and a deflection element.

[0027] The Tesla valve-type structure or structures may include six secondary channels.

[0028] Preferably, for the Tesla valve-type structure(s), the main channel and The secondary channels are carved into the lateral wall of the central body.

[0029] Preferably, for the Tesla valve structure(s), the length of the straight sections of the zigzag path decreases from the vent to at least one exhaust port, and the space between each secondary channel and the main channel is progressively reduced so that the path length of the secondary flow in each secondary channel also decreases from the vent to at least one exhaust port. Such an improvement of the Tesla valve allows for a more consistent braking effect along the entire length of the Tesla valve.

[0030] In a particular embodiment, the device further comprises at least one third chamber defining an upstream external passage arranged upstream of at least one second chamber and extending between a fluid inlet communicating with the first chamber and an outlet opening to the outside, for one or each of the at least one third chamber, the upstream external passage being defined by a Tesla valve-type structure. Thus, the arrangement of the at least one third chamber makes it possible to double the number of Tesla valve-type structures without increasing the overall length of the weapon equipped with the device according to the present invention.

[0031] Preferably, at least one third chamber is symmetrical to at least one second chamber with respect to a plane orthogonal to the central axis and located at the level of at least one vent.

[0032] Advantageously, for the or each of the at least one third chamber, the Tesla valve-type structure is supported by the side wall of a hollow upstream body and the cap body surrounds the Tesla valve-type structures of the at least one second chamber and of the at least one third chamber, so that the at least one third chamber is defined between the cap body and the side wall of the upstream body.

[0033] Preferably, the device is made of titanium. This material has a low density, allowing for weight reduction. Furthermore, titanium provides the device with a certain degree of mechanical strength, as well as excellent corrosion resistance.

[0034] The invention also relates to a firearm to which is coupled a sound moderator device as defined above, said device being coupled to the muzzle of the firearm.

[0035] The invention will be better understood upon reading the following description of particular embodiments, a description made in light of the accompanying drawings, drawings in which:

[0036] [Fig.1] is a schematic view, in use, showing a sound moderator device according to the invention coupled to the muzzle of a gun barrel;

[0037] [Fig.2] is a side perspective view of a sound moderating device according to a first embodiment of the invention;

[0038] [Fig.3] represents an exploded side view of the device of [Fig.2];

[0039] [Fig.4] is a side perspective view showing the device of [Fig.2] without the headdress body;

[0040] [Fig.5] is a longitudinal sectional view of the device of [Fig.2];

[0041] [Fig.6] represents a longitudinal cross-sectional view of a sound moderator device according to another embodiment of the invention, showing the paths followed by the gas flows;

[0042] [Fig.7] is a schematic longitudinal section of a Tesla valve-type structure according to one embodiment of the invention; and

[0043] [Fig.8] is a schematic longitudinal section of a Tesla valve-type structure according to another embodiment of the invention.

[0044] If we refer first of all to [Fig.1], we can see that the sound moderator device 1 according to the invention is intended to be coupled to the muzzle of a barrel C of a firearm A, in particular of a small or medium caliber firearm A.

[0045] Device 1 according to a first embodiment of the invention, shown in Figures 2 to 5, is obtained in a simple and economical way in three The components consist of separate parts: a fixing body 2, a central body 3, and a cap body 4. Advantageously, these three parts 2, 3, and 4 can be made of titanium. Of course, other materials, such as aluminum or stainless steel, can be used.

[0046] As can be seen in [Fig. 1], the mounting body 2 allows the device 1 to be coupled to the muzzle of a barrel C of a weapon A. This mounting body 2 is a hollow tubular body having an upstream end 2a and a downstream end 2b, the terms upstream and downstream being defined with respect to the direction of gas flow and the direction of movement of a projectile (not shown) fired by the weapon A.

[0047] In the embodiment shown in Figures 2 to 5, the upstream end 2a has a circular opening 20a whose diameter is adapted to that of the muzzle of a barrel C cooperating with the device 1. It will be understood that the upstream end region includes means for attaching it to the muzzle of a barrel C, which are well known in themselves, for example, threads or means for cooperating with it, in particular by snap-fitting. The downstream end 2b is fixed to the central body 3 and has a circular opening 20b whose diameter is adapted to that of the central body 3, the diameter of the opening 20b at the downstream end 2b being greater than the diameter of the opening 20a at the upstream end 2a. The downstream end region has an annular peripheral wall 21 adapted to come into contact with an end 4a of the cap body 4.This hollow body extends longitudinally along a central axis X, the openings 20a and 20b of the upstream end 2a and downstream end 2b being coaxial with said central axis X. Between the upstream end 2a and downstream end 2b, this hollow body defines a cylindrical chamber 22, called the inlet chamber 22, intended to communicate, on the one hand, with the muzzle of the barrel C of a weapon A, and on the other hand, with a volume defined inside the central body 3.

[0048] The central body 3 is a hollow tubular body extending along the central axis X, between a proximal end 3a and an opposite distal end 3b. The proximal end 3a has a circular opening 30a that communicates with the opening 20b of the distal end 2b of the fixation body 2. The distal end 3b also has a circular opening 30b leading outwards from the device 1.

[0049] A first chamber 31 is defined inside the cylindrical side wall 32 of this body 3, between the proximal end 3a and distal end 3b, in axial continuity with the inlet chamber 22. This first chamber 31 is provided with baffles 5, in particular four baffles 5, constituting the gas slowing elements 5. The baffles 5 are arranged one after the other, from upstream to downstream, and provide a central axial passage, along the central axis X, for guiding a projectile fired by the weapon A and for the path of a main gas flow Fl. In a known manner, these baffles 5 form decompression chambers allowing the slowing of the gas of said main flow Fl. Each baffle 5 here comprises a frustoconical wall 50 extending towards the proximal end 3a and integral with an inner surface of the lateral wall 32 of the central body 3 and a cylindrical wall 51, extending from the frustoconical wall 50 towards the proximal end 3a, delimiting a central opening 52.

[0050] Vents 6 are provided through the lateral wall 32 of the central body 3, between the opening 30a of the proximal end 3a and the baffles 5, in order to connect the first chamber 31 and a plurality of second chambers 33. These lateral vents 6 are therefore arranged upstream of the second chambers 33. In the embodiment shown, eight vents 6, regularly distributed angularly in the same transverse plane, are provided. Each vent 6 defines a teardrop-shaped opening, having a wide portion downstream and a narrowed portion upstream.

[0051] The second chambers 33, eight in number in the illustrated embodiment, are arranged around the first chamber 31, between the side wall 32 of the central body 3 and the cap body 4. Each second chamber 33 defines a downstream external passage for the flow of a gas stream from a secondary gas flow F2. This downstream external passage has a fluid communication inlet with the upstream end region of the first chamber 31 via one of the vents 6, the inlet opening onto the wider portion of the vent 6. This passage also has an outlet opening downstream to the outside of the device 1. Each downstream external passage is defined by a Tesla valve-type structure 7. In the illustrated embodiment, eight Tesla valve-type structures 7 are formed on the outside of the side wall 32 of the central body 3 and are integral with this central body 3.Alternatively, it could be envisaged that the Tesla valve type structures 7 are to be integral with the interior of the cap body 4. These structures 7 are regularly distributed angularly around the central axis X, in the axial continuity of the vents 6. .

[0052] With particular reference to Figures 3, 4, and 7, it can be seen that each Tesla valve-type structure 7 comprises opposing walls with alternating straight and curved sections, and a plurality of deflection elements 70 provided between these walls, specifically six deflection elements 70, each allowing the secondary flow F2 to be separated into a main flow F2P and a secondary flow F2S. In [Fig. 7], the main flow is represented by straight arrows, while the secondary flow F2S is represented by curved arrows. More precisely, these walls and deflection elements 70 define a main channel 71 and a plurality of secondary channels 72. The main channel 71 follows a zigzag path between the inlet and outlet of the structure 7. Each secondary channel 72 follows a substantially U-shaped curved path, the two branches of which open into the main channel. 71 and whose curvature allows a turn of approximately 180 degrees of the F2S current flowing within it. For this purpose, each deflection element 70 has a pocket shape comprising an oblique wall on the main channel side 71 and a rounded wall on the side opposite the main channel 71.

[0053] In order to allow the braking of the gases in the secondary flow F2, the convexity of the curved path, and therefore the convexity of the rounded wall of each deflection element 70, is oriented towards the outlet of the structure 7. Thus, from upstream to downstream, the secondary flow F2 entering the Tesla valve-type structure 7 via the associated vent 6 flows in a first straight section of the main channel 71 in a zigzag pattern, then is divided into a main flow F2P which flows in a second straight section of the main channel 71 in a zigzag pattern, and a secondary flow F2S which flows in a first curved section of the secondary channel 72 before rejoining the main flow F2P in the second straight section. This creates, downstream of the second straight section, a return effect which reduces the flow rate of the gases in the secondary flow F2.Similarly, the flow entering a third straight section is divided into a main flow F2P, which flows through this third straight section, and a secondary flow F2S, which is diverted into a second curved section before rejoining the main flow F2P downstream of the third straight section. This separation into two flows, F2P and F2S, which then rejoin, is repeated as many times as there are secondary channels 72, for example, six times here. Of course, the number of secondary channels 72 could be less than or greater than six. The path followed by each of the F2P and F2S flows is represented by arrows in [Fig. 7].

[0054] In this embodiment, the lengths of the different straight sections are the same and the lengths and sections of the secondary channels 72 are also the same, the deflection elements 70 all being of the same shape and dimensions.

[0055] From upstream to downstream, each secondary canal 72 extends alternately on one side and then the other of the main canal 71 in a zigzag pattern.

[0056] In practice, the main channel 71 and the secondary channels 72 are hollowed out in the lateral wall 32 of the central body 3.

[0057] In an improved embodiment of the Tesla valve-type structure 7, as shown in [Fig. 8], the length of the straight sections of the zigzag main channel 71 gradually decreases from upstream to downstream. Furthermore, the cross-section of the deflection elements 70 becomes progressively smaller, so that the curved path length of the secondary channels 72 gradually decreases from upstream to downstream. The resulting effect is a more constant braking of the secondary flow F2 throughout the structure 7.

[0058] The cap body 4 is a hollow tubular body extending along the central axis X between a proximal end 4a and a distal end 4b. The proximal end 4a presents a circular opening located in the same transverse plane as the opening 30a of the proximal end 3a of the central body 3. The edge delimiting this proximal opening comes against the peripheral wall 21 of the fixation body 2. Thus, the cap body 4 serves as a gas-tight envelope between the inlet and outlet of the second chambers 33.

[0059] The distal end 4b has an annular end wall 40 pierced by a central hole 400 centered on the central axis X and a plurality of exhaust holes 401. The central hole 400, of circular cross-section, extends in the axial alignment of the central opening 52 of each baffle 5, and has a diameter corresponding to that of the central openings 52. The exhaust holes 401 are arranged on the periphery of the end wall 40 so as to allow communication between the outlet of each Tesla valve-type structure 7 and the outside. In particular, the exhaust holes 401 are regularly distributed angularly along the peripheral edge of the end wall 40, the outlet of each structure 7 opening into at least one exhaust hole 401. For example, there could be sixteen regularly distributed circular section exhaust holes 401, the outlet of each structure 7 opening into two exhaust holes 401.Alternatively, there could be eight elongated 401 exhaust holes.

[0060] The lateral wall 41 of the cap body 4 is cylindrical with a constant circular cross-section. The inner diameter of the lateral wall 41 corresponds to the outer diameter of the central body 3, such that the walls and deflection elements 70 delimiting the Tesla valve-type structures 7 are in contact with the inner surface of the lateral wall 41 of the cap body 4. The length of the cap body 4 is equal to the length of the central body 3, so that the cap body 4 encloses the central body 3 from its proximal end 3a to its distal end 3b. The end wall 40 of the cap body 4 axially blocks the central body 3.

[0061] Alternatively, the central body 3 and the cap body 4 could have a shape other than cylindrical, for example, a hexagonal, rectangular or oval section.

[0062] Referring now to [Fig. 6], it can be seen that in another embodiment of the invention, the device 1 comprises, in addition to the first chamber 31 and the plurality of second chambers 33, a plurality of third chambers 8. The plurality of third chambers 8 extends symmetrically to the plurality of second chambers 33, with respect to a transverse plane containing the vents 6. Due to this symmetry, the number of Tesla valve-type structures 7 in the plurality of third chambers 8 is equal to the number of Tesla valve-type structures 7 in the plurality of second chambers 33, thus doubling the number of said structures 7. The Tesla valve-type structures 7 in the third chambers 8 are defined from one end to the other of a hollow upstream body 9, between the lateral wall of this upstream body 9 and an upstream cap body 10 located in the extension of the cap body 4, delimiting the second chambers 33. The lateral wall, with a circular cross-section, of this cylindrical hollow body has an internal diameter corresponding to the internal diameter of the central body 3. Its internal volume, without any baffles, is traversed by the fixing body 2. For the third chambers 8, each Tesla valve-type structure 7 has a fluid inlet communicating with the first chamber 31 via one of the vents 6, and an outlet opening to the outside of the device 1 on the upstream side. An upstream external passage is delimited by each Tesla valve-type structure 7 between this inlet and this outlet.

[0063] During firing, the projectile enters the sound moderator device 1 through the upstream end 2a of the fixing body 2, passes through the inlet chamber 22, then passes through the first chamber 31 to the outside, following the central axis X of the device 1.

[0064] In the embodiment of Figures 1 to 5, the gases used to propel this projectile enter the sound moderator device 1 through the upstream end 2a of the mounting body 2, pass through the inlet chamber 22 and enter the first chamber 31 inside the central body 3. A first part of the gases, constituting the main flow Fl, passes through this first chamber 31 from the proximal end 3a to the distal end 3b, to the outside, passing through the baffles 5. A second part of the gases, constituting the secondary flows F2, passes through the Tesla valve-type structures 7 of the second chambers 33, to the outside, after passing through the vents 6.

[0065] The second chambers 33 and the first chamber 31 are in fluid communication only through the vents 6 arranged upstream of the baffles 5, therefore in the vicinity of the proximal end 2a upstream of the first chamber 31.

[0066] The main flow Fl into the first chamber 31 is slowed by baffles 5, which produce local turbulence, resulting in noise reduction. The secondary flows F2 are slowed by Tesla valve-type structures 7, which prevent the formation of supersonic sound waves. These structures 7 allow for a more efficient slowing of the secondary flows F2 than with a simple winding path.

[0067] In the embodiment of [Fig.6], the secondary flows F2 pass through the Tesla valve-type structures 7 of the second chambers 33 and the third chambers 8, to the outside, which makes it possible to further slow down the gas flows passing through the vents 6.

[0068] It is understood that the particular embodiments which have just been described have been given by way of indication and not limitation, and that modifications may be made without departing from the present invention.

Claims

Demands

1. A sound moderator device (1) for a firearm (A), comprising: - a first chamber (31) defining a central passage extending longitudinally along a central axis (X) and through which a main flow (F1) of firing gas is intended to pass, the central passage extending between a proximal end (3a) intended to communicate upstream with a muzzle (C) of a firearm (A) and a distal end (3b) opening downstream to the outside, the first chamber (31) comprising a plurality of elements (5) for slowing down the gases of said main flow (F1); - at least a second chamber (33) defining a downstream external passage arranged around the central passage and through which a secondary flow (F2) of firing gas is intended to pass, the downstream external passage extending between an inlet in fluid communication with the first chamber (31) and an outlet opening to the outside;characterized by the fact that, for the or each of the at least one second chamber (33), the downstream external passage is defined by a Tesla valve type structure (7) configured to allow the braking of the gases of said secondary flow (F2), the two ends of the Tesla valve type structure (7) being respectively connected to a vent (6) provided between the inlet and the first chamber (31), upstream of the plurality of slowing elements (5), and to at least one exhaust hole (401) provided between the outlet and the outside.;

2. Device (1) according to claim 1, characterized in that the first chamber (31) is defined inside a central body (3), at least a second chamber (33) is defined inside a cap body (4) surrounding the central body (3) at least from the proximal end (3a) to the distal end (3b) and extending coaxially to the central axis (X), the central body (3) comprising a side wall (32) and at least one vent (6) being formed through said side wall (32) on the proximal end side (3a).

3. Device (1) according to claim 2, characterized in that, for the or each of the at least one second chamber (33), the Tesla valve type structure (7) is supported by the side wall (32) of the central body (3).

4. Device (1) according to any one of claims 1 to 3, characterized in that it comprises a plurality of seconds chambers (33) each comprising a Tesla valve type structure (7).

5. Device (1) according to any one of claims 1 to 4, characterized in that the Tesla valve-type structure (7) comprises a main channel (71) configured to follow a zigzag path between the associated vent (6) and at least one associated exhaust hole (401), and a plurality of secondary channels (72), each secondary channel (72) having an inlet connected to the main channel (71) in the continuation of a straight section of the zigzag path and an outlet opening into a subsequent adjacent straight section of the main channel (71) and being configured to follow a curved path having a concavity facing towards the straight section located between the inlet and the outlet and a convexity oriented towards the outlet of the structure (7) opening to the outside.

6. Device (1) according to claim 5, characterized in that, for the Tesla valve type structure (7) or each Tesla valve type structure (7), the length of the straight sections of the zigzag path decreases from the vent (6) to at least one exhaust hole (401), and the space between each secondary channel (72) and the main channel (71) is increasingly restricted so that the length of the path traveled by the secondary flow in each secondary channel (72) also decreases from the vent (6) to at least one exhaust hole (401).

7. Device (1) according to any one of claims 1 to 6, characterized in that it further comprises at least one third chamber (8) delimiting an upstream external passage arranged upstream of at least one second chamber (33) and extending between an inlet in communication of fluid with the first chamber (31) and an outlet opening to the outside, for the or each of the at least one third chamber (8), the upstream external passage being defined by a Tesla valve type structure (7).

8. Device (1) according to claim 7, characterized in that at least one third chamber (8) is symmetrical to at least one second chamber (33) with respect to a plane orthogonal to the central axis (X) and located at the level of at least one vent (6).

9. Device (1) according to any one of claims 1 to 8, characterized in that it is made of titanium.

10. Firearm (A) coupled to which is coupled a sound moderator device (1) according to any one of claims 1 to 9, said device (1) being coupled to the muzzle of the barrel (C) of the firearm (A).

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