Sound production device for overhead air horn

Abstract

The invention discloses a sound production device for an overhead air horn, which belongs to the technical field of air horns and comprises a mounting base, a sound production assembly, a protective shell and an elastic supporting piece. The mounting base is provided with the coaxial positioning part and the multiple groups of airflow holes surrounding the coaxial positioning part, and a balanced airflow path is formed in cooperation with a communicating structure of the ventilation hole, the airflow channel and the annular groove in the horn head; the annular groove and the airflow holes surrounding the coaxial positioning part cooperate to ensure that airflow is uniformly distributed along the circumferential direction of the sounding sheet, and the problem that local high-speed airflow impacts a specific area of the sounding sheet for a long time in the prior art is avoided; the conical supporting section of the mounting base is coaxially connected with the axial through section through a smooth conical surface, external compressed airflow is guided to be smoothly transited to the acoustic channel, resistance and pressure fluctuation when the airflow enters are reduced, a uniform stress foundation is provided for the sound production piece, the sound production piece is prevented from shifting due to uneven local stress from the source, and the sound production efficiency is improved. And the long-term stability of the vibration frequency is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air horn, and particularly relates to a sound generating device for an overhead air horn. BACKGROUND

[0002] The air horn is a kind of automobile horn, which uses the airflow of compressed air to make the metal diaphragm inside the air horn vibrate to produce sound. Air horns are generally installed on trucks to warn pedestrians and vehicles during travel and ensure driving safety.

[0003] The airflow channel of the traditional overhead air horn generally has the problem of unevenness. For example, a truck and its air horn assembly with the announcement number CN215621688U, the air horn assembly thereof realizes volume adjustment through the air supply pipeline, pressure regulating valve and on-off valve, but the uniformity of the airflow channel is not optimized. In actual application, uneven distribution of airflow in the channel will cause local high-speed airflow to impact a specific area of the sound generating piece for a long time, so that the sound generating piece gradually deviates from the original position. Such deviation not only changes the vibration frequency of the sound generating piece, but also damages the sealing performance of the sound generating piece and the horn seat, resulting in air leakage and sound quality degradation.

[0004] In view of the above problems, the present application aims to provide a sound generating device for an overhead air horn to solve the problems of air horn deviation and sound quality in the existing technology in terms of airflow channel uniformity, sound generating piece stability and sound quality control. SUMMARY

[0005] In view of the above problems of the prior art, in order to improve the sound quality of the air horn and prevent the deviation of the sound generating piece of the air horn, the present application provides a sound generating device for an overhead air horn.

[0006] The present application provides a sound generating device for an overhead air horn, comprising: A mounting base is provided with a flange ring for fixation and an acoustic channel penetrating along the central axis direction of the mounting base, and the mounting base is provided with a coaxial positioning part and a plurality of groups of airflow holes arranged around the coaxial positioning part, the airflow holes being in communication with the acoustic channel; A sound generating assembly comprises a horn head assembled on the coaxial positioning part and a sound generating piece mounted on the bottom of the base, the horn head is sleeved on the coaxial positioning part and the inner wall thereof is tightly fitted with the side wall of the coaxial positioning part, the side wall of the horn head is provided with an air passage, the horn head is provided with an airflow channel in communication with the air passage, and the bottom surface of the horn head is provided with an annular groove in communication with the airflow channel and surrounding the coaxial positioning part, the annular groove is also in communication with the airflow holes; A protective shell is arranged outside the mounting base and the horn head, the protective shell comprises an upper shell and a bottom shell, the upper shell is provided with a sound outlet corresponding to the sound outlet end of the acoustic channel; the bottom shell is coaxially arranged with the sound outlet and is detachably connected with the upper shell; An elastic support is arranged between the sound production sheet and the bottom shell, which provides elastic pre-tightening force to the sound production sheet to make the sound production sheet abut against the bottom surface of the mounting base.

[0007] Optionally, the airflow channel is a spiral airflow channel.

[0008] Optionally, a plurality of groups of mounting holes are uniformly distributed on the flange ring in the circumferential direction.

[0009] Optionally, the acoustic channel comprises an axial through section coaxially connected, the axial through section extends along the central axis and has a columnar shape, and the radial dimension of the axial through section remains constant along the axial direction.

[0010] Optionally, the mounting base comprises a conical support section, the inner wall of the conical support section is connected to the inlet end of the axial through section, the radial dimension of the conical support section gradually increases in the direction away from the axial through section, the inner wall surface is a smooth transition conical surface, and the conical surface coaxially connects with the inner wall surface of the axial through section; one end of the conical support section with a large radial dimension is fixedly connected with the flange ring, and the other end is provided with a circular mounting table; the coaxial positioning part is a limiting tube fixed to the circular mounting table, and the airflow holes are distributed on the circular mounting table and surround the limiting tube.

[0011] Optionally, the bottom end of the horn head is aligned with the end surface of the circular mounting table.

[0012] Optionally, the elastic support is a fixed sheet and a compression spring, the fixed sheet is clamped with the bottom shell, one end of the compression spring is fixedly connected with the fixed sheet, and the other end abuts against the sound production sheet.

[0013] In summary, the present application has at least one of the following beneficial technical effects: 1. The present application forms a balanced airflow path by arranging the coaxial positioning part and a plurality of airflow holes surrounding the coaxial positioning part on the mounting base, and cooperating with the communication structure of the air inlet hole-airflow channel-annular groove in the horn head. The annular groove and the airflow holes surrounding the coaxial positioning part work together to ensure that the airflow is evenly distributed in the circumferential direction of the sound production sheet, avoiding the problem that in the prior art, the local high-speed airflow long-term impacts a specific area of the sound production sheet. At the same time, the conical support section of the mounting base is coaxially connected with the axial through section through the smooth conical surface, which guides the external compressed airflow to smoothly transition to the acoustic channel, further reduces the resistance and pressure fluctuation when the airflow enters, and provides a uniform stress basis for the sound production sheet, preventing the sound production sheet from deviating due to uneven local stress and ensuring the long-term stability of the vibration frequency.

[0014] 2.The present application realizes precise elastic pre-tightening of the sound production sheet through the structural design of the elastic support: the clamping structure of the fixed sheet and the bottom shell provides a stable installation reference for the elastic support, avoiding displacement due to vibration; the sound production sheet is always in close abutment with the bottom surface of the installation base. This structure can resist displacement of the sound production sheet caused by long-term airflow impact, maintain the relative position accuracy of the sound production sheet and the installation base, ensure stable vibration frequency, and eliminate the assembly gap between the bottom end of the loudspeaker head and the end face of the circular mounting table, further preventing airflow leakage, ensuring that the compressed airflow is applied to the sound production sheet along the preset path, and improving the consistency of sound production efficiency and sound quality output. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole structure schematic diagram of a sound production device for an overhead air horn.

[0016] Figure 2 It is a three-dimensional structure schematic diagram of an installation base in a sound production device for an overhead air horn.

[0017] Figure 3 It is a bottom view structure schematic diagram of an installation base in a sound production device for an overhead air horn.

[0018] Figure 4 It is a three-dimensional structure schematic diagram of a sound production assembly in a sound production device for an overhead air horn.

[0019] Figure 5 It is a bottom view structure schematic diagram of a sound production assembly in a sound production device for an overhead air horn.

[0020] Figure 6 It is a whole structure schematic diagram of a sound production assembly and an installation base combined in a sound production device for an overhead air horn.

[0021] Figure 7 It is a structure schematic diagram of a sound production sheet in a sound production device for an overhead air horn.

[0022] Figure 8 It is a structure schematic diagram of an elastic support in a sound production device for an overhead air horn.

[0023] Figure 9 It is a structure schematic diagram of a bottom shell in a sound production device for an overhead air horn.

[0024] Figure 10 It is a local cross-section structure schematic diagram of a sound production assembly in a sound production device for an overhead air horn.

[0025] Explanation of reference signs: 1, mounting base; 101, flange ring; 102, axial through section; 103, conical support section; 104, coaxial positioning part; 105, air flow hole; 106, circular mounting table; 2, sound production assembly; 201, horn head; 202, sound production sheet; 203, air vent; 204, annular groove; 3, protective shell; 301, upper shell; 302, bottom shell; 303, sound outlet; 4, fixing sheet; 5, compression spring. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the accompanying drawings.

[0027] The present application discloses a sound production device for an overhead air horn.

[0028] Reference Figure 1 and Figure 8 A sound production device for an overhead air horn comprises a mounting base 1, a sound production assembly 2, a protective shell 3, and an elastic support.

[0029] Reference Figures 1 to 9, the mounting base 1 is provided with a flange ring 101 for fixing and an acoustic channel penetrating along the central axis direction of the mounting base 1, the mounting base 1 is provided with a coaxial positioning part 104 and a plurality of airflow holes 105 arranged around the coaxial positioning part 104, the airflow holes 105 are communicated with the acoustic channel; the sound generating assembly 2 comprises a horn head 201 assembled on the coaxial positioning part 104 and a sound generating sheet 202 mounted on the bottom of the base, the horn head 201 is sleeved on the coaxial positioning part 104 and the inner wall closely abuts the side wall of the coaxial positioning part 104, the side wall of the horn head 201 is provided with a ventilation hole 203, the horn head 201 is provided with an airflow channel communicated with the ventilation hole 203, the bottom surface of the horn head 201 is provided with an annular groove 204 communicated with the airflow channel and surrounding the coaxial positioning part 104, and the annular groove 204 is also communicated with the airflow hole 105; the protective shell 3 covers the outside of the mounting base 1 and the horn head 201, the protective shell 3 comprises an upper shell 301 and a bottom shell 302, the upper shell 301 is provided with a sound outlet 303 corresponding to the sound outlet end of the acoustic channel; the bottom shell 302 is coaxially arranged with the sound outlet 303 and is connected with the upper shell 301 in a detachable manner; the elastic supporting piece is arranged between the sound generating sheet 202 and the bottom shell 302 and is used for providing elastic pre-tightening force to the sound generating sheet 202 to make the sound generating sheet 202 abut against the bottom surface of the mounting base 1, and the acoustic channel provides a preset path for sound propagation; the coaxial positioning part 104 provides a reference for the coaxial assembly of the sound generating assembly 2, the plurality of airflow holes 105 surrounding the coaxial positioning part 104 are communicated with the acoustic channel and are configured to uniformly distribute airflow along the surrounding path; the horn head 201 is sleeved on the coaxial positioning part 104 and the inner wall closely abuts the side wall, which ensures the coaxiality between components and avoids airflow turbulence caused by assembly misplacement; the communication structure of the ventilation hole 203, the airflow channel and the annular groove 204 constructs an equal airflow path of "airflow-ventilation hole 203-airflow channel-annular groove 204-airflow hole 105-acoustic channel", which makes the airflow uniformly act on the sound generating sheet 202 and prevents the sound generating sheet 202 from being locally forced to deviate; the covering structure of the upper shell 301 and the bottom shell 302 provides physical protection for the internal mounting base 1 and the sound generating assembly 2, avoids the invasion of external dust and impurities and affects the performance of the components; the sound outlet 303 corresponds to the sound outlet end of the acoustic channel, which ensures effective sound output; the detachable connection structure is convenient for the maintenance, repair and replacement of the internal components in the later period; the elastic pre-tightening force provided between the sound generating sheet 202 and the bottom shell 302 makes the sound generating sheet 202 always abut against the bottom surface of the mounting base 1, which prevents the sound generating sheet 202 from deviating due to long-term airflow impact and ensures the stability of the vibration frequency of the sound generating sheet 202; on the other hand, it ensures the sealing performance of the sound generating sheet 202 and the mounting base 1 and avoids the deterioration of sound quality caused by airflow leakage.

[0030] Reference Figure 10The air flow channel is a spiral air flow channel. The spiral structure optimizes the air flow channel, so that when the compressed air flow flows along the spiral path in the channel, the spiral guide effect can reduce air flow turbulence and flow resistance, and further optimize the uniformity of air flow distribution in the channel. At the same time, the spiral structure can prolong the flow path of the air flow in the channel, so that the air flow pressure is more stable, avoiding the vibration fluctuation of the sound production sheet 202 caused by instantaneous air flow impact, thereby strengthening the sound production stability and improving the consistency of sound quality output.

[0031] With reference to Figure 2 The flange ring 101 is uniformly distributed with multiple groups of mounting holes along the circumference. The uniformly distributed mounting holes provide multiple point, symmetrical mounting references for the mounting base 1, ensuring that the mounting base 1 can keep the axis centered when fixed, avoiding the inclination of the base caused by the offset of the mounting point, and further preventing the subsequent sound production assembly 2 and acoustic channel from producing coaxiality deviation due to the inclination of the base, ensuring that the preset path of the air flow channel is not damaged, maintaining the stability of air flow balance and sound production effect.

[0032] With reference to Figure 3 The acoustic channel includes an axial through section 102 coaxially connected. The axial through section 102 extends along the central axis and has a columnar shape with a constant radial dimension along the axial direction. The axial through section 102 extending along the central axis and having a constant radial dimension is configured to provide a straight and stable conveying path for air flow and sound, avoiding air flow turbulence and sound loss caused by sudden changes in the cross section of the channel.

[0033] With reference to Figure 6 The bottom end of the horn head 201 is aligned with the end face of the circular mounting table 106. Through the flush assembly relationship of the end face, the assembly gap between the horn head 201 and the circular mounting table 106 is eliminated, realizing the sealed connection of the two. This structure can prevent air flow from leaking from the assembly gap between the horn head 201 and the circular mounting table 106, ensure that the compressed air flow passes through the preset path of "air flow channel-annular groove 204-air flow hole 105" to act on the sound production sheet 202, avoid the reduction of sound production efficiency and sound quality fluctuation caused by air leakage, and reduce the influence of dust accumulation in the gap on the components.

[0034] With reference to Figures 1 to 6, the mounting base 1 comprises a tapered support section 103, the inner wall of the tapered support section 103 is connected to the inlet end of the axial through section 102, the radial dimension gradually expands in the direction away from the axial through section 102, the inner wall surface is a smooth transition conical surface, coaxially connected with the inner wall surface of the axial through section 102, the end of the tapered support section 103 with large radial dimension is fixedly connected with the flange ring 101, the other end is provided with a circular mounting table 106, the coaxial positioning part 104 is a limiting tube fixed to the circular mounting table 106, the airflow holes 105 are distributed on the circular mounting table 106 and surround the limiting tube, the smooth conical surface of the tapered support section 103 is coaxially connected with the axial through section 102, configured to guide the external compressed airflow to smoothly transition along the conical surface to the axial through section 102, reduce the resistance and turbulence when the airflow enters, and avoid pressure fluctuations caused by airflow impact; the circular mounting table 106 provides a stable mounting carrier for the limiting tube, further enhances the coaxial assembly precision of the horn head 201, and prevents radial deviation when the horn head 201 is sleeved; the airflow holes 105 are distributed around the limiting tube on the circular mounting table 106, ensuring that when the airflow enters the airflow holes 105 from the annular groove 204, it can be evenly distributed in the circumferential direction of the limiting tube, further enhancing the uniformity of airflow distribution and providing a uniform stress basis for the sound production sheet 202.

[0035] With reference to Figure 1 and Figure 8 , the elastic support member is a fixed sheet 4 and a compression spring 5, the fixed sheet 4 is clamped with the bottom shell 302, one end of the compression spring 5 is fixedly connected with the fixed sheet 4, and the other end is in abutment with the sound production sheet 202, the structure that the fixed sheet 4 is clamped with the bottom shell 302 is configured to realize stable installation of the elastic support member on the bottom shell 302, avoid displacement of the elastic support member due to vibration, and ensure the stability of the pre-tightening force direction; the compression spring 5 is a conical spring, which realizes nonlinear stiffness adjustment through a variable diameter spiral structure, and the stiffness gradient characteristic of the conical spring can avoid resonance failure of ordinary springs due to constant stiffness when the air horn vibrates at high frequency, and can ensure that the sound production sheet 202 always maintains close abutment with the bottom surface of the mounting base 1, effectively resists the displacement of the sound production sheet 202 caused by long-term airflow impact, stabilizes the vibration frequency and sealing performance of the sound production sheet 202, and structurally ensures long-term stability of sound quality.

[0036] The working principle of the sound generating device for the overhanging air horn is as follows: taking "compressed air flow precise control - sound generating sheet 202 stable vibration - acoustic signal efficient conduction - core component protection" as the core working logic, the process is as follows: the external compressed air flow first enters the internally pre-set spiral air flow channel through the air hole 203 in the side wall of the horn head 201, the channel effectively suppresses air flow turbulence and reduces flow resistance by means of the spiral guide structure, so that the air flow forms a stable flow field with uniform pressure; then the air flow flows into the annular groove 204 around the coaxial positioning part 104 of the mounting base 1 on the bottom surface of the horn head 201, and the annular groove 204 is in precise correspondence and communication with the multiple groups of air flow holes 105 arranged around the coaxial positioning part 104 on the circular mounting table 106 of the mounting base 1, the air flow forms a circumferentially uniform air flow ring at this point, and then is synchronously and uniformly delivered to the acoustic channel through the multiple groups of air flow holes 105, realizing uniform action along the circumference of the sound generating sheet 202, and the coaxial positioning part 104 provides a precise coaxial assembly reference for the horn head 201, avoiding damage to the air flow distribution balance due to assembly misalignment. In the air flow excited sound generating sheet 202 vibration link, the elastic support between the sound generating sheet 202 and the bottom shell 302 of the protective shell 3 plays a key stabilizing role, the fixed sheet 4 forms a stable mounting reference through the clamping structure with the bottom shell 302, ensuring that the whole does not displace with the device vibration, and the compression spring 5 connected thereto applies a preset parameter of continuous elastic pretightening force to the sound generating sheet 202, so that the sound generating sheet 202 is always in close abutment with the bottom surface of the mounting base 1, preventing the sound generating sheet 202 from deviating due to long-term air flow impact, avoiding the occurrence of a sealing gap between the two to cause air leakage, and the design of aligning the bottom end of the horn head 201 with the end face of the circular mounting table 106 further eliminates the assembly gap, ensuring that the air flow acts on the sound generating sheet 202 along the preset path to efficiently excite vibration. The acoustic signal generated by the vibration of the sound generating sheet 202 is first guided by the smooth conical surface of the conical support section 103 of the mounting base 1, then enters the axial through section 102 of the acoustic channel, and finally is directionally output through the sound outlet 303 corresponding to the sound outlet end of the acoustic channel of the upper shell 301 of the protective shell 3, realizing the warning function; in addition, the upper shell 301 and the bottom shell 302 of the protective shell 3 form a closed physical protection barrier through detachable connection, which can effectively block the intrusion of external dust, water vapor, foreign matter and the like into the mounting base 1, the sound generating assembly 2 and the elastic support inside, avoiding impurities from adhering to cause air flow distribution abnormality, sound generating sheet 202 vibration obstruction or elastic pretightening force failure, so as to protect the air horn to maintain stable sound generating performance and sound quality output under complex driving conditions of the truck.

[0037] The above are preferred embodiments of the present application, but do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A sound-generating device for a top-mounted air horn, characterized in that, include: Mounting base (1), the mounting base (1) is provided with a flange ring (101) for fixing and an acoustic channel that runs through the central axis of the mounting base (1), the mounting base (1) is provided with a coaxial positioning part (104) and a plurality of airflow holes (105) surrounding the coaxial positioning part (104), the airflow holes (105) are connected to the acoustic channel; The sound-generating component (2) includes a horn head (201) assembled on the coaxial positioning part (104) and a sound-generating plate (202) installed on the bottom of the base. The horn head (201) is sleeved on the coaxial positioning part (104) and its inner wall is tightly fitted with the side wall of the coaxial positioning part (104). The side wall of the horn head (201) is provided with a vent hole (203). The horn head (201) is provided with an airflow channel communicating with the vent hole (203). The bottom surface of the horn head (201) is provided with an annular groove (204) communicating with the airflow channel and surrounding the coaxial positioning part (104). The annular groove (204) is also communicating with the airflow hole (105). A protective housing (3) is provided on the outside of the mounting base (1) and the speaker head (201). The protective housing (3) includes an upper housing (301) and a bottom housing (302). The upper housing (301) is provided with a sound outlet (303) corresponding to the sound outlet end of the acoustic channel. The bottom housing (302) is coaxially arranged with the sound outlet (303) and is detachably connected to the upper housing (301). An elastic support is provided between the sound-generating plate (202) and the bottom shell (302) to provide an elastic preload to the sound-generating plate (202) so that the sound-generating plate (202) abuts against the bottom surface of the mounting base (1).

2. The sound-generating device for a top-mounted air horn according to claim 1, characterized in that: The airflow channel is a spiral airflow channel.

3. A sound-generating device for a top-mounted air horn according to claim 1, characterized in that: The flange ring (101) has multiple sets of mounting holes evenly distributed along its circumference.

4. A sound-generating device for a top-mounted air horn according to claim 1, characterized in that: The acoustic channel includes a coaxially connected axially continuous section (102), which extends along the central axis, is columnar, and its radial dimension remains constant along the axial direction.

5. A sound-generating device for a top-mounted air horn according to claim 1, characterized in that: The mounting base (1) includes a tapered support section (103). The inner wall of the tapered support section (103) is connected to the inlet end of the axial through section (102). Its radial dimension gradually increases in the direction away from the axial through section (102). The inner wall surface is a smoothly transitioned conical surface, which is coaxially connected with the inner wall surface of the axial through section (102). The end of the tapered support section (103) with the larger radial dimension is fixedly connected to the flange ring (101), and the other end is provided with a circular mounting platform (106). The coaxial positioning part (104) is a limiting tube fixed to the circular mounting platform (106). The airflow holes (105) are distributed on the circular mounting platform (106) and surround the limiting tube.

6. A sound-generating device for a top-mounted air horn according to claim 5, characterized in that: The bottom end of the horn head (201) is aligned with the end face of the circular mounting platform (106).

7. A sound-generating device for a top-mounted air horn according to claim 1, characterized in that: The elastic support consists of a fixed plate (4) and a compression spring (5). The fixed plate (4) is snapped into the bottom shell (302). One end of the compression spring (5) is fixedly connected to the fixed plate (4), and the other end abuts against the sound-emitting plate (202).

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