Phase guide for low frequency enhancement and loudspeaker

Abstract

The utility model discloses a phase guide pipe for enhancing low frequency and loudspeaker, the phase guide pipe is installed in the box of loudspeaker, the box has the sound wave direction from inside to outside, and the phase guide pipe includes expansion section and compression section, and the expansion section is located at the outside of compression section, and the cross section size of compression section decreases along the sound wave direction, and the cross section size of expansion section increases along the sound wave direction, and the length of expansion section is less than the length of compression section. When the sound wave in the box is discharged from the phase guide pipe through airflow, because the length of compression section is longer, so the resistance that compression section receives when compressing airflow is smaller, at this moment, the compression speed of airflow is improved and forms pressure, and after the airflow enters expansion section, because the length of expansion section is shorter, so the airflow bursts out from the phase guide pipe after sharply expanding through expansion section, thereby improving the low frequency loudness and the depth of submergence of loudspeaker.

Description

Technical Field

[0001] This invention relates to the technical field of acoustics, and in particular to a phase guide tube and a loudspeaker for enhancing low frequencies. Background Technology

[0002] When a speaker's woofer is working, it generates sound waves in two directions simultaneously: one direction of sound waves radiates outwards from the speaker and is directly received by the human ear; the other direction of sound waves radiates inwards from the speaker. If the speaker uses a closed structure, this part of the sound waves will be absorbed by the cabinet's sound-absorbing material or converted into cabinet vibration, resulting in low-frequency energy loss. In addition, the air inside the cabinet will form elastic resistance, limiting the vibration amplitude of the woofer, ultimately resulting in shallow low-frequency extension and weak energy.

[0003] To provide an outlet for the idle low-frequency energy inside the speaker cabinet, utilizing previously wasted energy, and reducing the cabinet's constraint on the woofer, a bass reflex port can be installed on the back of the speaker cabinet. The core function of the bass reflex port is to optimize airflow inside the cabinet, overcoming the low-frequency limitations of closed-back speakers, and ultimately achieving a more powerful and transparent low-frequency performance.

[0004] The mainstream structure of the current phase guide tube is a straight cylindrical type with a constant cross section. Its core design is to match the length and diameter of the phase guide tube with the volume of the speaker cabinet and the parameters of the bass unit so that the low-frequency airflow at the outlet of the phase guide tube and the low-frequency sound waves radiated from the front of the bass unit achieve phase synchronization in the target frequency band, thereby enhancing the low-frequency energy.

[0005] However, as users continue to increase their demands for the "purity," "transient response," and "extreme low-frequency extension" of speakers, traditional constant-section straight-tube phase guides are finding it difficult to achieve better low-frequency performance. Utility Model Content

[0006] The present invention aims to provide a phase guide tube for enhancing low frequencies.

[0007] According to a first aspect of the present invention, a phase guide tube for enhancing low frequencies is installed in the enclosure of a loudspeaker, the enclosure having a sound wave direction from the inside out, the phase guide tube including an expansion section and a compression section, the expansion section being located outside the compression section, the cross-sectional dimension of the compression section decreasing along the sound wave direction, the cross-sectional dimension of the expansion section increasing along the sound wave direction, and the length of the expansion section being less than the length of the compression section.

[0008] The phase guide tube for enhancing low frequencies according to the embodiments of this utility model has at least the following beneficial effects: When external gas enters the speaker enclosure through the phase guide tube, the expansion section can initially accelerate and stabilize the airflow entering from outside the enclosure, avoiding airflow turbulence. When the airflow enters the compression section, due to the relatively long length of the compression section, the compression section can depressurize and diffuse the airflow, thereby reducing the drag coefficient during intake. When the sound waves inside the enclosure are discharged from the phase guide tube through the airflow, due to the relatively long length of the compression section, the compression section experiences less resistance when compressing the airflow. At this time, the compression speed of the airflow is increased and pressure is formed. When the airflow enters the expansion section, due to the relatively short length of the expansion section, the airflow expands rapidly through the expansion section and bursts out from the phase guide tube, thereby improving the low-frequency loudness and low-frequency depth of the speaker. Compared with the prior art, the design of this technology enables the speaker to achieve better low-frequency performance, further meeting the user's requirements for low-frequency sound quality.

[0009] According to some embodiments of this utility model, the opening size of the expansion section is equal to the opening size of the compression section. Equal opening sizes enable symmetrical resistance to bidirectional airflow, further reducing turbulence noise, and simultaneously ensuring more synchronized "introduction-extraction" phases of low-frequency sound waves, preventing discontinuities in the low-frequency response.

[0010] According to some embodiments of this utility model, the ratio of the maximum cross-sectional area of ​​the compression section to the minimum cross-sectional area of ​​the expansion section is 1.5 to 3. This ratio is also called the compression ratio, and a compression ratio within this range can adapt to most application scenarios.

[0011] According to some embodiments of the present invention, preferably, the ratio of the maximum cross-sectional area of ​​the compression section to the minimum cross-sectional area of ​​the expansion section is 2.

[0012] According to some embodiments of this utility model, the length of the compression section is negatively correlated with the resonant frequency within the enclosure. For speakers with low resonant frequencies, a longer compression section can extend the sound wave propagation path and enhance low-frequency delivery; for speakers with high resonant frequencies, a shorter compression section can prevent excessive low-frequency dragging.

[0013] According to some embodiments of this utility model, the length of the expansion section is a fixed value. Through the above settings, regardless of how the compression section is adjusted, the effect of airflow entering and exiting the phase guide tube remains consistent, avoiding low-frequency response fluctuations caused by changes in the length of the expansion section, thereby maintaining consistent product performance.

[0014] According to some embodiments of this utility model, specifically, the cross-sectional shape of the phase guide tube is circular or rectangular.

[0015] According to some embodiments of this utility model, in use, since the compression section needs to extend into the speaker enclosure, the end of the expansion section is connected to a mounting plate, which has multiple mounting holes. At this time, the phase guide tube is connected to the enclosure through the mounting plate of the expansion section.

[0016] According to some embodiments of this utility model, the outer surface of the expansion section is provided with multiple reinforcing ribs, which are connected to the mounting plate. During operation, the phase guide tube vibrates with the airflow, and there may be structural weak points at the connection between the mounting plate and the expansion section. The reinforcing ribs enhance the rigidity of the expansion section and reduce the risk of deformation due to long-term vibration.

[0017] The loudspeaker according to a second aspect embodiment of the present invention includes:

[0018] The housing is equipped with a phase inversion port;

[0019] The aforementioned low-frequency enhancement phase guide tube of the speaker is connected to the bass reflex port through the expansion section, and the compression section extends into the interior of the enclosure.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a three-dimensional structural schematic diagram of the phase guide tube provided in an embodiment of the present utility model;

[0023] Figure 2 yes Figure 1 The side view of the phase guide tube shown;

[0024] Figure 3 yes Figure 2 The cross-sectional view of the phase guide tube shown;

[0025] Figure 4 This is a three-dimensional structural diagram of the loudspeaker provided in an embodiment of the present utility model;

[0026] Figure 5 yes Figure 4 The front view of the speaker shown;

[0027] Figure 6 This is a cross-sectional view of the loudspeaker provided in an embodiment of this utility model.

[0028] In the attached diagram: 100-phase guide tube, 110-expansion section, 120-compression section, 200-box body, 130-mounting plate, 131-mounting hole, 140-reinforcing rib, 210-phase reversal hole, 220-sound emission hole. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0031] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0033] like Figures 1 to 3 As shown, a low-frequency enhancement phase guide tube 100 according to a first aspect embodiment of the present invention includes an expansion section 110 and a compression section 120. The expansion section 110 and the compression section 120 of the phase guide tube 100 are integrally formed, and the expansion section 110 is located outside the compression section 120. When the phase guide tube 100 is connected to the speaker enclosure 200, the phase guide tube 100 is connected to the enclosure 200 through the expansion section 110, and the compression section 120 extends into the speaker enclosure 200. When the bass unit inside the enclosure 200 is working, it needs to draw air from the external environment and generate sound waves that diffuse from the inside out.

[0034] In this embodiment, the cross-sectional shape of the phase guide tube 100 is circular or rectangular. The circular cross-section of the phase guide tube 100 has the least airflow resistance, making it suitable for speakers that pursue ultimate low-frequency sound quality, while the rectangular cross-section of the phase guide tube 100 is more suitable for the installation space of wall-mounted speakers or bar speakers. In addition, the cross-sectional shape of the phase guide tube 100 can also be trapezoidal or triangular, and is not limited to the above embodiment.

[0035] Specifically, the cross-sectional dimensions of the compression section 120 decrease along the direction of the sound wave, meaning that the cross-sectional dimensions of the compression section 120 decrease from the inside of the enclosure to the outside; the cross-sectional dimensions of the expansion section 110 increase along the direction of the sound wave, meaning that the cross-sectional dimensions of the expansion section 110 increase from the inside of the enclosure to the outside. Through this arrangement, the cross-sectional dimensions of the phase guide tube 100 first contract from the inside to the outside and then expand, resulting in a narrowing position for the phase guide tube 100 between the expansion section 110 and the compression section 120.

[0036] like Figure 3 As shown, in this embodiment, the length of the expansion section 110 is defined as L1, and the length of the compression section 120 is defined as L2, wherein the length of the expansion section 110 is less than the length of the compression section 120 (L1 < L2). The length of the compression section 120 needs to be comprehensively designed based on the speaker parameters. For example, the length of the compression section 120 is negatively correlated with the resonant frequency within the enclosure 200. For speakers with low resonant frequencies, a longer compression section 120 can extend the sound wave propagation path and enhance low-frequency delivery; for speakers with high resonant frequencies, a shorter compression section 120 can avoid excessive low-frequency dragging. Of course, the length of the compression section 120 is not only related to the resonant frequency within the enclosure 200, but also to parameters such as the volume of the enclosure 200 and the speaker characteristics.

[0037] It should be further explained that, since the length of the compression section 120 is negatively correlated with the resonant frequency within the enclosure 200, but the space within the enclosure 200 of some loudspeakers is limited, the enclosure 200 cannot accommodate the compression section 120 of the designed length. To solve the above technical problem, the compression section 120 can be set in an arc shape, replacing the straight section with a curve. This setting not only meets the relevant design length requirements of the compression section 120, but also adapts to the internal space of the enclosure 200.

[0038] In contrast to the variable compression section 120, the length of the expansion section 110 is constant in this embodiment. Because the length of the expansion section 110 is constant, the effect of airflow entering and exiting the phase guide tube 100 remains consistent regardless of how the compression section 120 is adjusted, avoiding low-frequency response fluctuations caused by changes in the length of the expansion section 110, thereby maintaining consistent product performance.

[0039] For example, in this embodiment, the opening area of ​​the expansion section 110 is defined as A1, the opening area of ​​the compression section 120 is defined as A2, and the cross-sectional area of ​​the narrowing position is defined as a. The opening area of ​​the expansion section 110 is equal to the opening area of ​​the compression section 120 (A1 = A2), and both the opening area of ​​the expansion section 110 and the opening area of ​​the compression section 120 are greater than the cross-sectional area of ​​the narrowing position (A1 = A2 > a). Since the phase guide tube 100 serves as both an airflow inlet and outlet component, when the expansion section 110 and the compression section 120 have the same opening size, symmetrical resistance to bidirectional airflow can be achieved, further reducing turbulence noise. Simultaneously, the "inlet-out" phase of the low-frequency sound waves is more synchronized, avoiding discontinuities in the low-frequency response.

[0040] Meanwhile, the ratio of the maximum cross-sectional area A2 of the compression section 120 to the minimum cross-sectional area a of the expansion section 110 is between 1.5 and 3. This ratio is also known as the compression ratio, and a compression ratio within this range can adapt to most application scenarios. When the compression ratio is too small, the low-frequency enhancement effect of the phase guide tube 100 is not obvious; when the compression ratio is too large, the airflow pressure in the housing 200 is too high when passing through the narrowing position, which can easily generate sonic knocking in the expansion section 110. Preferably, the ratio of the maximum cross-sectional area A2 of the compression section 120 to the minimum cross-sectional area a of the expansion section 110 is 2.

[0041] It should be further explained that the cross-sectional shape, cross-sectional size and cross-sectional area mentioned above are all cut in a direction orthogonal to the length of the phase guide tube 100, and all the cross-sections together constitute the length of the phase guide tube 100.

[0042] like Figure 1 and Figure 2 As shown, since the phase guide tube 100 is connected to the speaker enclosure 200 via the expansion section 110, a mounting plate 130 is connected to the end of the expansion section 110. The mounting plate 130 extends outward from the opening of the expansion section 110, meaning the size of the mounting plate 130 is larger than the size of the opening of the expansion section 110. The mounting plate 130 has multiple mounting holes 131, and the speaker enclosure 200 has multiple threaded holes. All mounting holes 131 and all threaded holes are respectively provided one-to-one, so that the mounting plate 130 and the enclosure 200 can be fixedly connected by screws, thereby realizing the assembly of the phase guide tube 100 and the enclosure 200.

[0043] Furthermore, the outer surface of the expansion section 110 is provided with multiple reinforcing ribs 140, which are connected to the mounting plate 130. The phase guide tube 100 vibrates with the airflow during operation, and there may be structural weak points at the connection between the mounting plate 130 and the expansion section 110. The reinforcing ribs 140 enhance the rigidity of the expansion section 110 and reduce the risk of deformation due to long-term vibration.

[0044] With the above structure, when external gas enters the speaker enclosure 200 through the phase guide tube 100, the expansion section 110 can initially accelerate and stabilize the airflow entering from outside the enclosure 200, avoiding airflow turbulence. When the airflow enters the compression section 120, due to the relatively long length of the compression section 120, it can depressurize and diffuse the airflow, thereby reducing the drag coefficient during intake. When the sound waves inside the enclosure 200 are discharged from the phase guide tube 100 through the airflow, due to the relatively long length of the compression section 120, the compression section 120 experiences less resistance when compressing the airflow. At this time, the compression speed of the airflow is increased, forming pressure. When the airflow enters the expansion section 110, due to the relatively short length of the expansion section 110, the airflow expands rapidly through the expansion section 110 and bursts out from the phase guide tube 100, thereby improving the low-frequency loudness and bass extension of the speaker. Compared with the prior art, this technology enables the speaker to achieve better low-frequency performance, further meeting users' requirements for low-frequency sound quality.

[0045] like Figures 4 to 6 As shown, a loudspeaker according to a second aspect embodiment of the present invention includes a bass reflex tube 100 for enhancing low frequencies, as described in the first aspect embodiment of the present invention, and a cabinet 200. The surface of the cabinet 200 is provided with a bass reflex port 210 and a sound emission port 220, which are located on a pair of sides of the cabinet 200. The bass reflex tube 100 is connected to the cabinet 200 via a mounting plate 130. In this case, the expansion section 110 of the bass reflex tube 100 covers the bass reflex port 210 of the cabinet 200, and the compression section 120 of the bass reflex tube 100 extends from the bass reflex port 210 into the interior of the cabinet 200. A bass unit (not shown in the figures) is provided inside the cabinet 200. The sound-emitting surface of the bass unit faces the sound emission port 220. When the bass unit is working, in addition to emitting sound waves towards the sound emission port 220, it also emits sound waves away from the sound emission port 220. These sound waves are conducted to the external environment through the bass reflex tube 100.

[0046] Since the loudspeaker adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0047] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A phase guide for enhancing low frequencies, mounted in a cabinet (200) of a loudspeaker, said cabinet (200) having a sound wave direction from inside to outside, characterized in that: The phase guide tube (100) includes an expansion section (110) and a compression section (120). The expansion section (110) is located outside the compression section (120). The cross-sectional dimension of the compression section (120) decreases along the direction of the sound wave, and the cross-sectional dimension of the expansion section (110) increases along the direction of the sound wave. The length of the expansion section (110) is less than the length of the compression section (120).

2. The phase guide for enhancing low frequencies according to claim 1, characterized in that: The opening size of the expansion section (110) is equal to the opening size of the compression section (120).

3. The phase guide for enhancing low frequencies according to claim 1 or 2, characterized in that: The ratio of the maximum cross-sectional area of ​​the compression section (120) to the minimum cross-sectional area of ​​the expansion section (110) is 1.5 to 3.

4. The phase guide for enhancing low frequencies according to claim 3, characterized in that: The ratio of the maximum cross-sectional area of ​​the compression section (120) to the minimum cross-sectional area of ​​the expansion section (110) is 2.

5. The phase guide for enhancing low frequencies according to claim 1, characterized in that: The length of the compression section (120) is negatively correlated with the resonant frequency within the housing (200).

6. The phase guide for enhancing low frequencies according to claim 1 or 5, characterized in that: The length of the expansion segment (110) is a constant.

7. The phase guide for enhancing low frequencies according to claim 1, characterized in that: The cross-sectional shape of the phase guide tube (100) is circular or rectangular.

8. The phase guide for enhancing low frequencies according to claim 1, wherein: The end of the expansion section (110) is connected to a mounting plate (130), and the mounting plate (130) is provided with a plurality of mounting holes (131).

9. The phase guide for enhancing low frequencies according to claim 8, characterized in that: The outer surface of the expansion section (110) is provided with a plurality of reinforcing ribs (140), which are connected to the mounting plate (130).

10. A loudspeaker characterised by include: The housing (200) is provided with a phase inversion hole (210); The phase guide tube for enhancing low frequencies as described in any one of claims 1 to 9, wherein the phase guide tube (100) is connected to the phase inversion port (210) via the expansion section (110) and the compression section (120) extends into the interior of the housing (200).

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