Reversing horn

Abstract

The reversing horn comprises a horn body (3), the horn body (3) is installed in a horn inner shell (2), the horn inner shell (2) is installed in a horn outer shell (1), a waterproof sound amplifying cover (1.3) with the opening end facing the horn body (3) is installed in the horn outer shell (1), and a horn sound amplifying opening (2.1) of the horn inner shell (2) is inserted into the waterproof sound amplifying cover (1.3). A rear cover (4) is installed on the tail portion of the loudspeaker outer shell (1), and the loudspeaker body (3) is contained in a sealing cylinder (4.3), inserted into the loudspeaker outer shell (1), on the rear cover (4). According to the reversing horn disclosed by the invention, the perfect solution of waterproof and sound amplification effects is realized in a compact structural design through a brand new design.

Description

Technical Field

[0001] The invention relates to a reversing horn, in particular to a reversing horn used on an engineering vehicle, and belongs to the technical field of vehicle electrical appliances. Background Art

[0002] At present, the reversing horn is one of the necessary devices on engineering vehicles. Conventional reversing horns lack the volume adjustment function. For this reason, Chinese patent CN206585757U discloses a "miniaturized reversing horn", which adjusts the input current by installing a circuit board in the shell, thereby achieving volume control. However, it lacks an effective sealing and waterproof structure, and the simple resonant cavity formed between the shell and the buzzer cannot effectively amplify the sound. For this reason, Chinese patent CN205622846U discloses "a new and improved voice reversing horn", which achieves partial waterproof function by adding a rainproof structure, but the performance is average. For this reason, there is an urgent need for a reversing horn with a compact structure, excellent sealing and waterproof performance, and good sound amplification effect. Summary of the invention

[0003] The purpose of the present invention is to overcome the above-mentioned shortcomings and provide a reversing horn which achieves a perfect solution of waterproofing and sound amplification effect in a compact structural design through a brand-new design.

[0004] The object of the present invention is achieved in that: A reversing horn comprises a horn body, wherein the horn body is installed in an inner horn shell, the inner horn shell is installed in an outer horn shell, a waterproof sound amplification cover with an opening end facing the horn body is installed in the outer horn shell, the horn sound amplification port of the inner horn shell is inserted into the waterproof sound amplification cover, a rear cover is installed at the rear of the outer horn shell, and the horn body is accommodated in a sealing tube on the rear cover inserted in the outer horn shell.

[0005] Preferably, a mounting ring with an annular structure is provided on the inner wall of the speaker outer shell, and the speaker inner shell is mounted on the mounting ring.

[0006] Preferably, the waist of the speaker sound expansion port is contracted inwardly, so that the speaker sound expansion port forms two resonance cavities of a cone structure.

[0007] Preferably, an annular gap formed between the outer wall of the sealing cylinder and the inner wall of the inner shell of the speaker constitutes air cavity one, a gas-permeable component is installed on the cylinder wall of the sealing cylinder, and the inner cavity of the sealing cylinder is connected to the air cavity one through the gas-permeable component.

[0008] Preferably, the bottom of the inner speaker shell is folded outward to form a flange with an annular structure, and the end face of the flange abuts against the inner wall of the outer speaker shell. The mounting ring, the outer wall of the inner speaker shell and the flange together form an air cavity 2 with an annular structure.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The front end of the speaker body of the present invention realizes two-level waterproofing through a waterproof sound amplification cover and a speaker sound amplification port inserted in the waterproof sound amplification cover, thereby preventing rainwater from entering and contacting the speaker body in the speaker inner shell; and the rear end of the speaker body is sealed in the rear cover, and a secondary seal is formed between the rear cover and the speaker outer shell, thereby ensuring the sealing effect.

[0010] The volume emitted by the speaker body is amplified through four resonance chambers with a folded-back design to achieve multi-level resonance in a compact size, ensuring the volume.

[0011] Finally, the use of breathable components ensures that the speaker body is in a normal pressure state when working, ensuring its sound effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The present invention is a schematic structural diagram of a reversing horn.

[0013] Figure 2 The figure is a cross-sectional view of a reversing horn according to the present invention.

[0014] Figure 3 A reversing horn according to the present invention Figure 2 A partial enlarged view of .

[0015] Figure 4 The present invention is a schematic structural diagram of a speaker housing of a reversing horn.

[0016] Figure 5 The present invention is a schematic structural diagram of a speaker inner shell of a reversing horn.

[0017] Figure 6 The figure is a schematic diagram of sound wave conduction when a reversing horn of the present invention is working.

[0018] in: Speaker outer shell 1, speaker inner shell 2, speaker body 3, back cover 4, circuit board 5, air permeable component 6; Mounting plate 1.1, mounting ring 1.2, waterproof sound amplification cover 1.3, front positioning stop 1.4, rear positioning stop 1.5; Speaker amplification port 2.1, flange 2.2; Wiring hole 4.1, indicator hole 4.2, sealing tube 4.3, process hole 4.4; Indicator Lights 5.1. DETAILED DESCRIPTION

[0019] See also Figures 1 to 6The present invention relates to a reversing horn, comprising a horn outer shell 1, on the outer wall of which a mounting plate 1.1 is provided, through which the reversing horn of the present invention can be conveniently installed on a vehicle, and on the inner wall of which a mounting ring 1.2 of an annular structure is provided, and the mounting ring 1.2 divides the horn outer shell 1 into two sections, front and rear, wherein the front section is a sound cavity of a cone-shaped cylinder structure with a large aperture at the opening end, and the rear section is a mounting cavity for mounting a horn body 3; The waterproof sound amplifying cover 1.3 is laterally buckled in the sound cavity, and the bottom part of the waterproof sound amplifying cover 1.3 is connected to the inner wall of the speaker outer shell 1, so that the waterproof sound amplifying cover 1.3 is suspended in the speaker outer shell 1, and the inverted waterproof sound amplifying cover 1.3 also prevents rainwater from entering.

[0020] A front positioning stop 1.4 of an annular structure is provided on the end surface of the mounting ring 1.2 facing the mounting cavity, and the outer edge of the speaker inner shell 2 is clamped on the front positioning stop 1.4, and the speaker sound expansion port 2.1 protruding at the front section of the speaker inner shell 2 extends into the sound cavity of the speaker outer shell 1, and is inserted into the waterproof sound expansion cover 1.3 (the cooperation between the speaker sound expansion port 2.1 and the waterproof sound expansion cover 1.3 also further prevents rainwater from contacting the internal speaker body 3), and the waist of the speaker sound expansion port 2.1 shrinks inward, so that the speaker sound expansion port 2.1 forms two conical structure resonance cavities one and two (S1, S2), and at the same time, a resonance cavity three S3 is formed between the outer wall of the speaker sound expansion port 2.1 and the inner wall of the waterproof sound expansion cover 1.3, and a resonance cavity four S4 is formed between the outer wall of the waterproof sound expansion cover 1.3 and the inner wall of the cone structure sound cavity of the speaker outer shell 1.

[0021] The speaker body 3 is installed in the speaker inner shell 2, and the rear cover 4 is installed on the speaker outer shell 1 by cooperating with the rear positioning stop 1.5, and the sealing tube 4.3 connected to the rear cover 4 extends into the installation cavity of the speaker outer shell 1. After the top of the sealing tube 4.3 and the speaker body 3, and the speaker body 3 and the interior of the speaker inner shell 2 are sealed with glue, the annular gap formed between the outer wall of the sealing tube 4.3 and the inner wall of the speaker inner shell 2 constitutes an air cavity Q1, and at the same time, a breathable component 6 is installed on the wall of the sealing tube 4.3 (the breathable component 6 can be a breathable and waterproof membrane made of a polymer material, or a breathable membrane flap made of a flexible material, or a group of two one-way breathable valves in opposite directions, or a breathable valve, a pressure valve, etc.), so that the working cavity W1 formed by the rear cover 4, the sealing tube 4.3 and the speaker body 3 is connected to the air cavity Q1 through the breathable component 6.

[0022] At the same time, the bottom of the speaker inner shell 2 is folded outward to form a flange 2.2 of an annular structure, and the end surface of the flange 2.2 is against the inner wall of the speaker outer shell 1, so that the mounting ring 1.2, the outer wall of the speaker inner shell 2, and the flange 2.2 enclose an air cavity Q2 of an annular structure. There is a certain air gap between the flange 2.2 and the inner wall of the speaker outer shell 1, so there is also a connection relationship between the air cavity Q2 and the air cavity Q1, and the air cavity Q2 can supplement the air cavity Q1 to a certain extent.

[0023] In addition, the circuit board 5 is fixedly installed in the back cover 4, and the indicator light 5.1 on the circuit board 5 passes through the indicator light hole 4.2 on the back cover 4, the wiring harness (power supply line and control line) connecting the circuit board 5 passes through the wiring hole 4.1 on the back cover 4, the circuit board 5 is cast in the back cover 4 through epoxy resin sealing, and the sealing layer of the epoxy resin sealing cast simultaneously blocks the wiring hole 4.1 and the indicator light hole 4.2.

[0024] The assembly process of the reversing horn of the present invention is as follows: First, the speaker body 3 is fixed and sealed in the speaker inner shell 2 by glue pouring, and the circuit board 5 is fixed and sealed in the back cover 4 by glue pouring. Then, the speaker body 3 is connected by the wire passing through the glue pouring layer of the circuit board 5. Then, the sealing tube 4.3 of the back cover 4 is sealed and connected with the inner wall of the speaker inner shell 2 by glue pouring to form a semi-finished product. Finally, the semi-finished product is installed in the speaker outer shell 1, thereby completing the entire assembly process; the existence of the process hole 4.4 can play a role in exhaust during the glue pouring and sealing process, avoiding the internal pressure of the speaker body 3 from being compressed by the positive pressure state of the glue pouring, and the process hole 4.4 is blocked after the glue pouring is completed. The sealing performance is achieved by the above-mentioned multi-stage glue pouring and sealing, and the secondary isolation is achieved by the structural design of the sealing tube 4.3, ensuring the waterproof sealing performance.

[0025] When the reversing horn of the present invention is working: The volume emitted by the speaker body 3 is oscillated and amplified by the resonance cavity formed by the resonance cavity 1 S1 and the resonance cavity 2 S2, and then reflected by the waterproof sound amplification cover 1.3 into the resonance cavity 3 S3 of the ring structure, and then turned again to pass through the resonance cavity 4 S4. The multi-stage resonance cavity is realized through a round-trip design structure, which greatly reduces the volume and improves the effect of oscillation and sound amplification.

[0026] At the same time, when the speaker body 3 is overheated due to long-term operation, the gas in the working chamber W1 will expand due to the heat, and the pressure of the working chamber W1 will increase, thereby squeezing the buzzer of the speaker body 3 and affecting its sound effect. Therefore, in this patent, when the pressure in the working chamber W1 increases, the gas will enter the air chamber Q1 through the air permeable component 6 for pressure relief. When the speaker body 3 stops working and the temperature drops, the pressure in the working chamber W1 decreases, and the gas will flow back from the air chamber Q1 to the working chamber W1 through the air permeable component 6, thereby ensuring that the working chamber W1 is stable in a constant pressure state. In order to ensure the reliability of pressure relief, the design of the air chamber Q2 plays a backup role, further ensuring the constant pressure state of the working chamber W1.

[0027] In addition: It should be noted that the above specific implementation is only an optimization scheme of this patent. Any changes or improvements made by technicians in this field based on the above concept are within the scope of protection of this patent.

Claims

1. A reversing horn, comprising a horn body (3), characterized in that: A speaker body (3) is installed in a speaker inner shell (2), the speaker inner shell (2) is installed in a speaker outer shell (1), and a waterproof sound amplification cover (1.3) with an opening end facing the speaker body (3) is installed in the speaker outer shell (1), a speaker sound amplification port (2.1) of the speaker inner shell (2) is inserted into the waterproof sound amplification cover (1.3), a rear cover (4) is installed at the rear of the speaker outer shell (1), and a sealing tube (4.3) on the rear cover (4) inserted into the speaker outer shell (1) accommodates the speaker body (3).

2. A reversing horn according to claim 1, characterized in that: An annular mounting ring (1.2) is provided on the inner wall of the speaker outer shell (1), and the speaker inner shell (2) is mounted on the mounting ring (1.2).

3. The reversing horn according to claim 1, characterized in that: The waist of the speaker sound expansion port (2.1) contracts inwards, so that the speaker sound expansion port (2.1) forms two resonance cavities with a cone structure.

4. The reversing horn according to claim 1, characterized in that: An annular gap formed between the outer wall of the sealing cylinder (4.3) and the inner wall of the speaker inner housing (2) constitutes an air cavity 1 (Q1). A permeable component (6) is mounted on the cylinder wall of the sealing cylinder (4.3). The inner cavity of the sealing cylinder (4.3) is connected to the air cavity 1 (Q1) via the permeable component (6).

5. The reversing horn according to claim 1, characterized in that: The bottom of the speaker inner shell (2) is folded outward to form a flange (2.2) with an annular structure, and the end surface of the flange (2.2) is against the inner wall of the speaker outer shell (1), and the mounting ring (1.2), the outer wall of the speaker inner shell (2), and the flange (2.2) together form an air cavity 2 (Q2) with an annular structure.

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