A phase reversal tube and phase reversal speaker using the same

Abstract

The embodiment of the present invention discloses a phase-inverting tube and a phase-inverting speaker using the same. The phase-inverting tube includes a phase-inverting tube body and a diaphragm. The diaphragm is fixed to the phase-inverting tube body. The middle of the diaphragm has an air hole for airflow to pass through. When the airflow passes through the phase-inverting tube, the diaphragm can be driven to vibrate. Therefore, the technical solution of the embodiment of the present invention can effectively reduce the sound noise of the phase-inverting speaker, improve the sound quality of the speaker, and widen the bandwidth of the speaker, so that the phase-inverting speaker has a better low-frequency effect.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of December 24, 2020, application number 202011553102.8, and invention name “A bass reflex tube and a bass reflex speaker using the same”. Technical Field

[0002] The invention relates to the field of speaker equipment, and in particular to a phase reflex tube and a phase reflex speaker using the same. Background Art

[0003] A bass reflex speaker is generally composed of a speaker box, a speaker, and a bass reflex tube. When the diaphragm in front of the speaker of a bass reflex speaker vibrates, the rear of the speaker will also vibrate. After installing the bass reflex tube, the air in the box will radiate to the front through the bass reflex tube, causing interference with the forward radiated sound waves, thereby providing a wider bandwidth than a closed speaker, strengthening the bass and improving the sound quality of the speaker. Since the diameter of the bass reflex tube is smaller than the diameter of the speaker, the flow velocity through the bass reflex tube is relatively large, which is prone to generate noise. The commonly used method to reduce noise is to increase damping by adding sound-absorbing materials such as foam, but this method will inevitably reduce the sensitivity of the speaker. Summary of the invention

[0004] The embodiments of the present invention provide a bass reflex tube and a bass reflex speaker using the same, which can improve the above problems and enhance the sound quality of the speaker.

[0005] In a first aspect, an embodiment of the present invention provides a bass reflex tube, comprising a bass reflex tube body and a diaphragm; the bass reflex tube body has an inlet end and an outlet end, and an inner diameter of the bass reflex tube body gradually decreases from the inlet end to the outlet end; the diaphragm is fixed to the bass reflex tube body, a middle portion of the diaphragm has an air hole for air flow to pass through, and the diaphragm is configured to vibrate when driven by the air flow passing through the bass reflex tube body.

[0006] Furthermore, the diaphragm is fixed to the inlet end.

[0007] Furthermore, the diaphragm includes a folded ring and a vibrating plate; the folded ring has an outer edge and an inner edge, the outer edge of the folded ring is fixed to the inverted tube body; the vibrating plate is fixed to the inner edge of the folded ring, and the air hole is arranged on the vibrating plate.

[0008] Furthermore, the folding ring is made of foam, and the vibration plate is made of copper.

[0009] Furthermore, the diaphragm further comprises a dustproof net, which is arranged at the diaphragm and blocks the air holes to prevent dust from passing through the air holes.

[0010] Furthermore, the dustproof net is made of a flexible mesh material.

[0011] Furthermore, the diameter of the air hole is smaller than the inner diameter of the outlet end.

[0012] Furthermore, the hole area of ​​the outlet end is twice the area of ​​the pores.

[0013] Furthermore, the inverter tube body is in a tapered tubular shape.

[0014] In a second aspect, an embodiment of the present invention further provides a bass reflex speaker, comprising a cabinet, a speaker and at least one bass reflex tube as described in the first aspect; the cabinet has a cavity inside; the speaker is fixed to the cabinet; the bass reflex tube is fixed to the cabinet and connects the outside of the cabinet with the cavity, the outlet end of the bass reflex tube body is fixed to the outer wall of the cabinet, and the inlet end extends into the cavity.

[0015] The embodiment of the present invention provides a bass reflex tube and a bass reflex speaker using the same. The bass reflex tube includes a bass reflex tube body and a diaphragm. The inner diameter of the bass reflex tube body gradually decreases from the inlet end to the outlet end. The diaphragm is fixed to the bass reflex tube body. The middle of the diaphragm has an air hole for air flow to pass through. When the air flow passes through the bass reflex tube, the diaphragm is driven to vibrate. Therefore, the technical solution of the embodiment of the present invention can effectively reduce the sound noise of the bass reflex speaker, improve the sound quality of the speaker, and widen the bandwidth of the speaker, so that the bass reflex speaker has a better low-frequency effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 is a schematic diagram of the three-dimensional structure of the phase inverted tube according to an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the exploded structure of the phase reversing tube according to an embodiment of the present invention;

[0019] Figure 3 is a front view schematic diagram of a phase inverting tube according to an embodiment of the present invention;

[0020] Figure 4 is a rear view schematic diagram of a phase inverting tube according to an embodiment of the present invention;

[0021] Figure 5 is a schematic cross-sectional view of the inverted tube along the AA plane of an embodiment of the present invention;

[0022] Figure 6 is a schematic diagram of the three-dimensional structure of a bass reflex speaker according to an embodiment of the present invention;

[0023] Figure 7 is a front view schematic diagram of a bass reflex speaker according to an embodiment of the present invention;

[0024] Figure 8 It is a schematic cross-sectional view of the bass reflex speaker along the BB plane according to an embodiment of the present invention.

[0025] Description of reference numerals:

[0026] 1- inverter tube body; 11- inlet end; 12- outlet end;

[0027] 2-diaphragm; 21-air hole; 22-folding ring; 221-outer edge; 222-inner edge; 23-diaphragm; 24-dustproof net;

[0028] 3-box; 31-cavity;

[0029] 4- Speakers. DETAILED DESCRIPTION

[0030] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the detailed description of the present invention below, some specific details are described in detail. It is possible for a person skilled in the art to fully understand the present invention without the description of these details. In order to avoid confusing the essence of the present invention, known methods, processes, flows, components and circuits are not described in detail.

[0031] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0032] Unless the context clearly requires otherwise, words such as “include”, “including” and the like in the specification should be interpreted as including rather than being exclusive or exhaustive; that is, as including but not limited to “including”.

[0033] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] Figure 1-Figure 4 They are respectively a three-dimensional structural schematic diagram, an exploded structural schematic diagram, a front view schematic diagram and a rear view schematic diagram of the inverted tube according to an embodiment of the present invention; Figure 5 The phase inverting tube edge of the embodiment of the present invention Figure 4 Schematic cross-sectional view of the AA surface in FIG. Figure 6-Figure 7 They are respectively a three-dimensional structural schematic diagram and a front view schematic diagram of a bass reflex speaker according to an embodiment of the present invention; Figure 8 The phase-inverted speaker of the embodiment of the present invention is Figure 7 Schematic diagram of the cross section of the BB plane. Figure 1-Figure 8As shown, the bass reflex tube of the embodiment of the present invention comprises a bass reflex tube body 1 and a diaphragm 2. The bass reflex tube body 1 has an inlet end 11 and an outlet end 12. The inlet end 11 of the bass reflex tube body 1 refers to an end disposed in the cabinet 3 of the sound box, and the outlet end 12 of the bass reflex tube body 1 refers to an end opposite to the outside of the sound box. The diaphragm 2 is fixed to the bass reflex tube body 1, and the middle part of the diaphragm 2 has an air hole 21 for air flow to pass through. The diaphragm 2 is driven by the air flow passing through the bass reflex tube body 1 to vibrate, pushing the air to radiate sound waves outward. Compared with the bass reflex tube without the diaphragm 2, the diaphragm 2 is provided at the bass reflex tube body 1 to adjust the resonance frequency of the bass reflex tube, thereby extending the low frequency.

[0035] The cross-sectional dimension of the inverted tube body 1 perpendicular to the axis gradually decreases from the inlet end 11 to the outlet end 12. Compared with the inverted tube with a cylindrical hole, the inverted tube of the embodiment of the present invention increases the average cross-sectional dimension in the pipeline, which can effectively reduce the flow velocity of the airflow in the inverted tube, thereby improving the noise.

[0036] The cross-sectional shape of the inverted tube body 1 can be set to a hollow polygon, a circular ring, a hollow ellipse, etc. as required, or the outer contour and the inner contour of the inverted tube body 1 can also be different, for example, the outer contour of the cross-sectional shape of the inverted tube body 1 is a polygon, and the inner contour is a circle, etc. Preferably, the cross-sectional shape of the inverted tube body 1 is a circular ring, which is convenient for processing and can make the resonance of the inverted tube body 1 more stable. Furthermore, the inverted tube body 1 is a tapered tube, that is, the wall thickness of the inverted tube body 1 is uniform. Of course, the inverted tube body 1 can also be made by processing a truncated cone-shaped hole in a cylinder, and the wall thickness of the inverted tube body is gradual.

[0037] The location, material, structure, shape, etc. of the diaphragm 2 can be selected according to the expected acoustic performance of the inverted tube. The diaphragm 2 can be set at the end of the inverted tube body 1, or can be set inside the inverted tube body 1. The diaphragm 2 set at different locations will have different effects on the flow rate of the airflow in the inverted tube. Preferably, the diaphragm 2 is fixed to the inlet end 11, which can make the airflow rate in the inverted tube slower, thereby reducing noise.

[0038] The diaphragm 2 includes a folded ring 22 and a vibrating plate 23. The folded ring 22 has an outer edge 221 and an inner edge 222. The outer edge 221 of the folded ring 22 is fixed to the body 1 of the inverted tube. In this embodiment, the outer edge 221 of the folded ring 22 is fixed to the edge of the inlet end 11. The vibrating plate 23 is fixed to the inner edge 222 of the folded ring 22. The vibrating plate 23 and the inner edge 222 of the folded ring 22, and the outer edge 221 of the folded ring 22 and the body 1 of the inverted tube can be connected by bonding, crimping, etc. The middle part of the vibrating plate 23 is hollowed out to form the air hole 21. The size of the air hole 21 can adjust the resonant frequency of the inverted tube. Preferably, the diameter of the air hole 21 is smaller than the inner diameter of the outlet end 12, which can better play the role of extending the low frequency. The specific sizes of the inverted tube body 1 and the air hole 21 can be designed by acoustic simulation to make the inverted tube have the expected acoustic properties. In this embodiment, the hole area of ​​the outlet end 12 is basically twice the area of ​​the air hole 21. The specific shape of the folded ring 22 can be set according to the expected acoustic performance of the bass reflex tube and matched with the resonant frequency of the bass reflex tube. The folded ring 22 can be a positive folded ring or a negative folded ring; it can be a single folded ring structure or a multi-folded ring structure. The material of the folded ring 22 can be rubber, leather, plastic, etc. For example, the folded ring 22 in the present embodiment is made of foam material and has good fatigue resistance. The vibrator 23 can be a diaphragm made of polymer materials, metals and other materials, which can bend back and forth within a certain deformation range to drive the air to vibrate. In the present embodiment, the vibrator 23 can be a copper sheet. According to the requirements of the acoustic performance expected to be achieved by the bass reflex tube, the vibrator 23 can have a flat surface or folds with a predetermined shape.

[0039] Preferably, the diaphragm 2 further includes a dustproof net 24, which is arranged at the vibrating piece 23 and blocks the air hole 21 to prevent external dust from entering the box body 3 of the bass reflex speaker through the air hole 21. Preferably, the dustproof net 24 is made of a flexible mesh material, such as a mesh made of mesh cloth or a grid made of flexible plastic. The dustproof net 24 can be fixed to one side of the vibrating piece 23 by bonding with an adhesive, welding, or the like.

[0040] like Figure 6-Figure 8As shown, the inverted tube can be installed on the inverted speaker. The inverted speaker includes a box 3, a speaker 4 and an inverted tube. The box 3 has a cavity 31 inside, the speaker 4 is fixed on the wall of the box 3, and the diaphragm of the speaker 4 faces the outside of the box 3. The inverted tube is fixed to the box 3 and connects the cavity 31 of the box 3 and the outside of the box 3. Specifically, in this embodiment, the outlet end 12 of the inverted tube body 1 is fixed on the wall of the box 3, the inlet end 11 of the inverted tube body 1 extends into the cavity 31 of the box 3, and the inverted tube is substantially perpendicular to the wall of the box 3. When the speaker 4 of the inverted speaker makes a sound, a pressure difference is generated between the cavity 31 of the box 3 and the outside, so that air passes through the inverted tube and interferes with the sound waves radiated by the speaker 4, thereby widening the bandwidth of the speaker. The bass reflex speaker can be provided with one or more bass reflex tubes, the direction of which can be the same as or opposite to the direction of the speaker 4 , and the specific setting method is designed according to the expected acoustic properties of the bass reflex speaker.

[0041] The inverted tube of the embodiment of the present invention comprises an inverted tube body and a diaphragm, the inner diameter of the inverted tube body gradually decreases from the inlet end to the outlet end, the diaphragm is fixed to the inverted tube body, the middle part of the diaphragm has an air hole for air flow to pass through, and the air flow drives the diaphragm to vibrate when passing through the inverted tube. Therefore, the technical solution of the embodiment of the present invention can effectively reduce the sound noise of the inverted speaker, improve the sound quality of the speaker and widen the bandwidth of the speaker, so that the inverted speaker has a better low-frequency effect.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A phase-inverting tube, characterized in that: include: The inverter tube body (1) has an inlet end (11) and an outlet end (12); as well as A diaphragm (2) is fixed to the inverted tube body (1), and a middle portion of the diaphragm (2) has an air hole (21) for air flow to pass through; The diaphragm (2) is arranged at the end of the inverted tube body (1), or is arranged inside the inverted tube body (1), and the diaphragm (2) is configured to be driven by the airflow passing through the inverted tube body (1) to generate vibration.

2. The inverter tube according to claim 1, characterized in that: The cross-sectional dimensions of the inverted tube body (1) perpendicular to the axis gradually decrease from the inlet end (11) to the outlet end (12), and the cross-sectional shape is a hollow polygon, a circular ring or a hollow ellipse.

3. The inverter tube according to claim 1 or 2, characterized in that: The diaphragm (2) is fixed to the inlet end (11).

4. The inverter tube according to claim 1 or 2, characterized in that: The diameter of the air hole (21) is smaller than the inner diameter of the outlet end (12).

5. The inverter tube according to claim 1 or 2, characterized in that: The hole area of ​​the outlet end (12) is twice the area of ​​the air hole (21).

6. The inverter tube according to claim 1, characterized in that: The diaphragm (2) comprises: A folding ring (22) having an outer edge (221) and an inner edge (222), wherein the outer edge (221) of the folding ring (22) is fixed to the inverted tube body (1); and A vibration plate (23), wherein the vibration plate (23) is fixed to the inner edge (222) of the folding ring (22), and the vibration plate (23) has the air hole (21).

7. The inverter tube according to claim 6, characterized in that: The folding ring (22) is made of foam, and the vibration sheet (23) is made of a copper sheet.

8. The inverter tube according to claim 6 or 7, characterized in that: The diaphragm (2) further comprises: A dustproof net (24) is arranged at the vibration plate (23) and blocks the air hole (21) to prevent dust from passing through the air hole (21).

9. The inverter tube according to claim 1, characterized in that: The inverter tube body (1) is in a tapered tubular shape; and / or The inverter tube body (1) has a truncated cone-shaped hole.

10. A bass reflex speaker, characterized in that: include: A box body (3) having a cavity (31) therein; A loudspeaker (4) fixed to the box (3); as well as At least one inverted tube as claimed in any one of claims 1 to 9 is fixed to the box (3) and connects the outside of the box (3) with the cavity (31), the outlet end (12) of the inverted tube body (1) is fixed to the wall of the box (3), and the inlet end (11) extends into the cavity (31).

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