A heavy bass loudspeaker with heat dissipation air duct

Abstract

This invention belongs to the field of loudspeakers, specifically a subwoofer with a heat dissipation duct, comprising: a magnetic circuit system, which includes a washer, a magnet, and a T-shaped iron fixedly arranged from top to bottom, wherein the T-shaped iron includes a central column and a base fixedly connected to each other; a vibration system, which includes a voice coil and a diaphragm fixedly connected to the voice coil, wherein a dust cover is fixedly provided on the surface of the diaphragm; and a frame system for accommodating and supporting the magnetic circuit system and the vibration system, which includes a frame and a shell fixedly connected to the frame; through the cooperation of the air duct assembly and the heat-conducting column, the airflow driven by the voice coil can fully exchange heat with the heat-conducting column when passing through the first air duct, and the heat generated by the voice coil can be transferred outward through a dual path of air convection and solid conduction, thereby improving the heat dissipation performance of the device for the voice coil.

Description

Technical Field

[0001] This invention relates to the field of loudspeakers, specifically a subwoofer with a heat dissipation duct. Background Technology

[0002] A subwoofer (also known as a subwoofer) is an electroacoustic transducer specifically designed to reproduce low-frequency sounds (typically 20-150Hz). It is widely used in home theaters, car audio systems, professional performances, and other scenarios. Unlike ordinary full-range speakers, subwoofers need to operate stably for extended periods under conditions of high amplitude and high power to produce a powerful low-frequency effect. However, this operating characteristic causes its voice coil (the core heat-generating component of the speaker) to generate a large amount of heat in a short time, necessitating a heat dissipation design.

[0003] In existing technologies, the main method of heat dissipation design for loudspeakers is passive convection cooling: multiple heat dissipation holes or ventilation slots are opened on the side of the frame. When the voice coil works, it generates heat. The hot air first accumulates in the magnetic gap area around the voice coil and the internal space of the frame. Then, it slowly escapes from the heat dissipation holes in the frame through natural convection—the hot air density decreases and rises naturally. At the same time, external cold air naturally enters the interior of the frame from other heat dissipation holes, forming a passive circulating cooling.

[0004] The aforementioned existing technology has the following drawbacks: The voice coil, as the sole heat source, is encased within a closed magnetic circuit composed of a T-shaped iron, a magnet, and a washer. This is separated from the heat dissipation holes in the frame by multiple layers of metal structures, resulting in an almost sealed "heat trap" inside the voice coil. This means that a large amount of heat accumulated inside the voice coil cannot pass through the magnetic circuit system to reach the opening in the frame. Even if the frame opening is large and the natural convection is strong, cold air cannot enter the core hot area inside the voice coil, and hot air cannot be discharged from the inside. The heat can only be transferred to the frame and then dissipated through slow solid conduction via the T-shaped iron and the magnet. The conduction path is long and the thermal resistance is high. Furthermore, the air inside the voice coil cannot circulate, forming a "dead air layer" that further hinders heat conduction. Ultimately, this results in a continuous rise in voice coil temperature, extremely low heat dissipation efficiency, and susceptibility to thermal damage under high power.

[0005] Therefore, a subwoofer with a heat dissipation duct is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A subwoofer with a heat dissipation duct, comprising: a magnetic circuit system, which includes a washer, a magnet, and a T-shaped iron fixedly arranged from top to bottom, wherein the T-shaped iron includes a central column and a base fixedly connected to each other; a vibration system, which includes a voice coil and a diaphragm fixedly connected to the voice coil, wherein a dust cover is fixedly provided on the surface of the diaphragm; a frame system for accommodating and supporting the magnetic circuit system and the vibration system, the frame system including a frame and a shell fixedly connected to the frame; and a duct assembly, disposed on the magnetic circuit system, for housing the voice coil and the diaphragm. The heat generated during operation is discharged; the air duct assembly includes a first air duct opened on the T-shaped iron and a second air duct opened on the magnet, wherein the first air duct is arranged to pass through the central column and the base along the axis, and the second air duct is arranged in a circumferential array on the magnet; the outer shell surface is provided with an interface communicating with the first air duct and the second air duct, and a heat-conducting column located inside the first air duct is fixedly provided on the inner wall of the outer shell; through the cooperation of the air duct assembly and the heat-conducting column, the airflow driven by the voice coil can fully exchange heat with the heat-conducting column when passing through the first air duct, and the heat generated by the voice coil can be transferred outward through a dual path of air convection and solid conduction, thereby improving the heat dissipation performance of the device for the voice coil.

[0008] Preferably, the bottom edge of the central column is provided with multiple third air ducts; the third air ducts are arranged in a circular array on the central column; by setting the third air ducts, the hot airflow inside the voice coil can enter the first air duct through the third air duct when it flows downward, reducing the turbulence and accumulation phenomenon generated at the transition between the central column and the base, and improving the heat conduction capacity of the first air duct.

[0009] Preferably, the inner wall of the dust cover and the inner wall of the base are both fixedly provided with a first guide plate, and the surface of the dust cover is porous; the first guide plate has an inverted trumpet shape. When the voice coil moves upward, it creates a negative pressure inside the magnetic gap, drawing in fresh, cool air from the outside through the dust cover above. When the voice coil moves downward, it compresses the air inside the magnetic gap and pushes the hot airflow through the first and second air ducts for discharge. During this process, the first guide plate, through its inverted trumpet-shaped structure, reduces the resistance to airflow when flowing downward and increases the resistance when flowing upward. This allows the airflow to flow smoothly in the "forward" direction (from top to bottom) and be obstructed in the "reverse" direction (from bottom to top), improving the controllability of airflow, reducing air oscillations generated during voice coil movement, and enhancing the device's guiding and directing effect on airflow.

[0010] Preferably, a baffle is fixedly provided on the inner wall of the central column; the baffle has a spiral structure; the baffle allows the flowing air to move along a spiral path when passing through the baffle, thereby extending the contact time and path between the airflow and the heat-conducting column and improving the heat exchange efficiency between the airflow and the heat-conducting column.

[0011] Preferably, the first air duct is provided with a thermal damper mechanism, which includes: a valve assembly for adjusting the ventilation area of ​​the first air duct, including a vertically movable valve plate, the bottom of which has a conical sealing surface, and a valve seat that mates with the valve plate on the inner wall of the central column; a thermal element disposed on the heat-conducting column, configured to drive the valve assembly to a first opening state when the temperature is below a first threshold, and to drive the valve assembly to a second opening state when the temperature is above a second threshold; the thermal element senses the operating temperature of the speaker in real time, and in a low-temperature state, i.e., a high-temperature... When the temperature is below the first threshold, the thermistor causes the valve assembly to be in the first opening state. At this time, the ventilation area of ​​the air duct is small, the airflow is weak, the wind noise is low, and there is no adverse effect on the acoustic performance. It can also play a role in dust prevention. When the speaker operates at high power for a long time and the temperature rises to exceed the second threshold, the thermistor deforms or expands due to heat, driving the valve assembly to gradually open to the second opening state. This can increase the ventilation area of ​​the air duct, enhance the airflow, and improve the heat dissipation capacity. Therefore, the higher the temperature of the voice coil when it is working, the larger the valve opening and the stronger the heat dissipation. An adaptive heat dissipation mechanism that is positively correlated with the heat generation can be formed.

[0012] Preferably, the thermal element includes a channel disposed inside the heat-conducting column and a piston, a diaphragm, and a thermally expanding material disposed from top to bottom inside the channel. The diaphragm is fixedly disposed inside the channel, one end of the piston is fixedly connected to the diaphragm, and the other end is fixedly connected to the valve plate. The piston and the heat-conducting column are connected by a spring. The thermally expanding material can be a paraffin-based material, which is solid at room temperature. Its volume is small below the first threshold, which allows the valve plate and valve seat to be in a closed state. When the speaker temperature is higher than the second threshold, that is, exceeding the phase change point of paraffin, the paraffin gradually melts from solid to liquid, and its volume expands significantly. The expanded paraffin can push the piston outward through the diaphragm, and the piston can drive the valve seat to open, thereby increasing the ventilation area of ​​the first air duct. When the temperature drops, the paraffin solidifies and contracts, and the piston is reset under the action of the spring, keeping the valve plate and valve seat in a closed state. The above process is driven by the heat generated by the voice coil and requires no additional energy.

[0013] Preferably, the channel includes a first flow channel, a transition flow channel, and a third flow channel that are interconnected, wherein the cross-sectional area of ​​the third flow channel is smaller than that of the first flow channel; by setting the cross-sectional area of ​​the third flow channel to be smaller than that of the first flow channel, the radial displacement of the thermally expanding material can be greater when it is heated and expanded, thereby amplifying the thermal expansion transmission displacement of the thermally expanding material.

[0014] Preferably, a second guide plate is fixedly provided on the top of the valve plate; the surface of the second guide plate is arc-shaped; the arrangement of the second guide plate can reduce the resistance and sudden change in direction of the airflow in the first air duct when it flows through the valve plate, thereby reducing the airflow turbulence formed at the valve plate.

[0015] Preferably, the outer wall of the outer casing is fixedly provided with a notch; the bottom of the basin frame is provided with a mark corresponding to the position of the notch; when installing the outer casing, the interface of the side wall needs to be aligned with the second air duct on the magnet. In this process, the positioning of the outer casing during installation can be achieved by pre-aligning the notch and the mark on the basin frame, thereby improving the convenience and accuracy of the outer casing installation.

[0016] Preferably, the bottom of the outer shell is fixedly provided with multiple fins to increase the heat conduction area of ​​the outer shell; the fins can increase the contact area between the outer shell and the outside air, thereby improving the heat exchange capacity of the outer shell.

[0017] The advantages of this invention are: 1. The subwoofer with a heat dissipation air duct described in this invention, through the cooperation of the air duct assembly and the heat-conducting column, allows the voice coil-driven airflow to fully exchange heat with the heat-conducting column when passing through the first air duct, and allows the heat generated by the voice coil to be transferred outward through a dual path of air convection and solid conduction, thereby improving the heat dissipation performance of the device for the voice coil.

[0018] 2. The subwoofer with a heat dissipation air duct described in this invention, by setting a third air duct, allows the hot airflow inside the voice coil to flow downwards and enter the first air duct through the third air duct, reducing the turbulence and accumulation phenomenon generated at the transition between the central column and the base, and improving the heat conduction capability of the first air duct. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the exploded structure of the present invention; Figure 3 This is a schematic diagram of the basin frame structure in this invention; Figure 4 This is a schematic diagram of the outer shell structure in this invention; Figure 5 This is a schematic diagram of the structure of the first air duct in this invention; Figure 6 This is a schematic diagram of the T-shaped iron structure in this invention; Figure 7 This is a schematic diagram of the structure of the heat-conducting column in this invention; Figure 8 This is a schematic diagram of the channel structure in this invention; Figure 9 This is a schematic diagram of the notch structure in this invention.

[0021] In the diagram: 1. T-shaped iron; 101. Center column; 102. Base; 12. Magnet; 13. Washer; 14. Basket; 15. Voice coil; 16. Housing; 17. Diaphragm; 18. Dust cover; 19. Heat-conducting column; 1101. First air duct; 1102. Second air duct; 2. Third air duct; 3. First guide plate; 4. Baffle; 5. Valve plate; 52. Valve seat; 6. Thermal expansion material; 62. Diaphragm; 63. Piston; 64. Channel; 7. First flow channel; 72. Transition flow channel; 73. Third flow channel; 8. Second guide plate; 9. Notch; 92. Marking; 10. Fin. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] Specific implementation examples are given below.

[0024] Please see Figures 1 to 9 As shown in the figure, a subwoofer with a heat dissipation duct according to an embodiment of the present invention includes: a magnetic circuit system, which includes a washer 13, a magnet 12, and a T-shaped iron 1 fixedly arranged from top to bottom, wherein the T-shaped iron 1 includes a central column 101 and a base 102 fixedly connected to each other; a vibration system, which includes a voice coil 15 and a diaphragm 17 fixedly connected to the voice coil 15, wherein a dust cover 18 is fixedly provided on the surface of the diaphragm 17; and a frame system for accommodating and supporting the magnetic circuit system and the vibration system, wherein the frame system includes a frame 14 and an outer frame fixedly connected to the frame 14. The housing 16 includes an air duct assembly disposed on the magnetic circuit system for dissipating heat generated during the operation of the voice coil 15. The air duct assembly includes a first air duct 1101 disposed on the T-shaped iron 1 and a second air duct 1102 disposed on the magnet 12. The first air duct 1101 is axially connected to the central column 101 and the base 102, and the second air duct 1102 is arranged in a circular array on the magnet 12. The surface of the housing 16 is provided with an interface communicating with the first air duct 1101 and the second air duct 1102, and the inner wall of the housing 16 is fixed with a heat-conducting column 19 located inside the first air duct 1101. When the speaker is powered on, the voice coil 15 reciprocates at high speed in the magnetic gap between the center post 101 and the washer 13, generating a large amount of heat. The hot air inside the voice coil 15 is driven by the piston movement of the voice coil 15 to flow downwards along the first air duct 1101, through the center post 101 and the base 102 to the interface on the outer casing 16. A removable filter is installed in the interface. When the hot air flows, it can pass through the heat-conducting column 19 and transfer heat to the heat-conducting column 19. The bottom of the outer casing 16 has an interface that communicates with the first air duct 1101. The interface has a hollow frame to support and fix the heat-conducting column 19 and allow the airflow discharged from the first air duct 1101 to pass through the interface. The heat-conducting column 19 is located inside the first air duct 1101 and can transfer heat to the outer casing 16, forming a heat exchange path. At the same time, the hot air outside the voice coil 15 can... Driven by the airflow along the second air duct 1102 on the magnet 12, the airflow flows through the first air duct 1101 to the interface on the housing 16. The two hot air streams can be exhausted to the external environment through the interface. In addition, the heat generated by the voice coil 15 can be transferred to the magnetic circuit system, namely the T-shaped iron 1, the magnet 12, and the washer 13. The magnetic circuit system can transfer the heat to the housing 16 through thermal conduction. The housing 16 is made of aluminum alloy and has good thermal conductivity, which can form a solid conduction heat dissipation path. Combined with the above, the housing 16 can work with the heat-conducting column 19 to perform the dual functions of heat conduction and heat exchange. Through the cooperation of the air duct assembly and the heat-conducting column 19, the airflow driven by the voice coil 15 can fully exchange heat with the heat-conducting column 19 when it passes through the first air duct 1101. The heat generated by the voice coil 15 can be transferred to the outside through the dual paths of air convection and solid conduction, thereby improving the heat dissipation performance of the voice coil 15.

[0025] Please see Figure 6 As shown, multiple third air ducts 2 are provided at the bottom edge of the central column 101; the third air ducts 2 are arranged in a circular array on the central column 101. When the voice coil 15 moves downward, the hot air inside the voice coil 15 can flow downward accordingly. The third air duct 2 is set at the connection between the middle column 101 and the base 102, which allows the hot airflow between the outside of the middle column 101 and the voice coil 15 to enter the first air duct 1101 through the third air duct 2, reducing the resistance and accumulation of the airflow at this point, and facilitating the conduction of the hot airflow by the first air duct 1101. By setting the third air duct 2, the hot airflow inside the voice coil 15 can enter the first air duct 1101 through the third air duct 2 when it flows downward, reducing the turbulence and accumulation of the airflow at the transition between the middle column 101 and the base 102, and improving the conduction capacity of the first air duct 1101 for hot air.

[0026] Please see Figure 4 and Figure 5 As shown, the inner wall of the dust cover 18 and the inner wall of the base 102 are both fixedly provided with the first guide plate 3, and the surface of the dust cover 18 is multi-porous; the first guide plate 3 has an inverted trumpet-shaped structure. by Figure 5 For example, when the voice coil 15 moves upward, it creates a negative pressure inside the magnetic gap, drawing in fresh, cool air from the outside through the dust cover 18. When the voice coil 15 moves downward, it compresses the air inside the magnetic gap and pushes the hot airflow through the first air duct 1101 and the second air duct 1102 for discharge. During this process, the first guide plate 3, through its inverted trumpet-shaped structure, reduces the resistance to airflow when flowing downward and increases the resistance when flowing upward. This allows the airflow to flow smoothly in the "forward" direction (from top to bottom) and be obstructed in the "reverse" direction (from bottom to top), improving the controllability of airflow, reducing air oscillations generated when the voice coil 15 moves, and enhancing the device's guiding and directing effect on airflow. In practical implementation, the mesh diameter of the dust cover 18 is 0.5mm-3.0mm to isolate most visible particles in the air, and the opening rate is 25%-45% to comprehensively coordinate the air intake effect and the dust prevention effect.

[0027] Please see Figures 4 to 6 As shown, a baffle 4 is fixedly provided on the inner wall of the central column 101; the baffle 4 has a spiral structure. Specifically, the baffle 4 can be a continuous spiral surface structure, and its shape is similar to that of an auger blade. That is, the baffle 4 extends in a spiral line along the axial direction of the central column 101, with a spiral angle of 20°-30° and a spiral number of 1-3 turns. The baffle 4 can be set so that the flowing air can move along the spiral path when passing through the baffle 4, thereby prolonging the contact time and path between the airflow and the heat-conducting column 19 and improving the heat exchange efficiency between the airflow and the heat-conducting column 19. It should be noted that the installation of baffle 4 in the first air duct 1101 will introduce additional flow resistance, but combined with the aforementioned first guide plate 3, and the reciprocating motion of the voice coil 15, a unidirectional pumping effect can be formed, that is: When the voice coil 15 moves downward, the air inside the magnetic gap is compressed. The inverted horn structure of the first guide plate 3 creates greater resistance to the upward airflow, forcing the compressed air to preferentially enter the first air duct 1101 and the second air duct 1102, forming forced exhaust. When the voice coil 15 moves upward, a negative pressure is formed inside the magnetic gap. The first guide plate 3 has less resistance to the downward airflow, and external cold air is drawn into the magnetic gap through the porous structure of the dust cover 18, completing the air replenishment. The above process ensures that each vibration cycle of the voice coil 15 generates a net unidirectional airflow (discharging hot air downwards and drawing in cold air upwards). Even with the additional resistance from the helical baffle, the compressive pressure generated by the voice coil 15 is sufficient to overcome this resistance, ensuring continuous and stable airflow within the duct. Please refer to [link / reference]. Figures 5 to 8As shown, a thermal damper mechanism is provided in the first air duct 1101. The thermal damper mechanism includes: a valve assembly for adjusting the ventilation area of ​​the first air duct 1101, including a vertically movable valve plate 5, the bottom of the valve plate 5 having a conical sealing surface, and the inner wall of the central column 101 having a valve seat 52 that cooperates with the valve plate 5; and a thermal element disposed on the heat-conducting column 19, configured to drive the valve assembly to a first opening state when the temperature is below a first threshold, and to drive the valve assembly to a second opening state when the temperature is above a second threshold. The thermistor senses the speaker's operating temperature in real time. In low-temperature conditions (such as low-power playback or standby), i.e., when the temperature is below the first threshold, the thermistor puts the valve assembly in the first opening state, i.e., the effective ventilation area of ​​the air duct between the valve plate 5 and the valve seat 52 is ≤10% of the total area. At this time, the air duct ventilation area is small, the airflow is weak, the wind noise is low, and there is no adverse effect on the acoustic performance. It can also play a role in dust prevention. When the speaker operates at high power for a long time and the temperature rises to exceed the second threshold, the thermistor deforms or expands due to heat, driving the valve assembly to gradually open to the second opening state, i.e., the effective ventilation area of ​​the air duct between the valve plate 5 and the valve seat 52 is ≥80% of the total area. This can increase the air duct ventilation area, enhance the airflow, and improve the heat dissipation capacity. Therefore, the higher the temperature of the voice coil 15 when it is working, the larger the valve opening and the stronger the heat dissipation. An adaptive heat dissipation mechanism that is positively correlated with the heat generation can be formed.

[0028] Please see Figure 8 As shown, the thermal element includes a channel 64 disposed inside the heat-conducting column 19 and a piston 63, a diaphragm 62, and a thermal expansion material 6 disposed from top to bottom inside the channel 64. The diaphragm 62 is fixedly disposed inside the channel 64. One end of the piston 63 is fixedly connected to the diaphragm 62, and the other end is fixedly connected to the valve plate 5. The piston 63 is connected to the heat-conducting column 19 by a spring. The piston 63 is made of stainless steel. A blind hole may be provided at the bottom of the valve plate 5. The top of the piston 63 is fixed to the blind hole at the bottom of the valve plate by interference fit or epoxy resin. A spring is fitted onto the bottom of the piston 63 and can press the valve plate 5 against the valve seat 52 in its natural state. The thermal expansion material 6 may be a paraffin-based material, which is solid at room temperature. Below the first threshold (e.g., 40℃-60℃), its volume is small, allowing the valve plate 5 and valve seat 52 to be in a closed state. When the temperature of the voice coil 15 exceeds the second threshold (e.g., 70℃-90℃), that is, exceeding the phase change point of paraffin (usually set at 50-70℃), the paraffin gradually melts from a solid state. In a liquid state, the volume expands significantly (the volume expansion rate can reach more than 10%). The expanded paraffin wax can push the piston 63 outward through the diaphragm 62. The piston 63 can drive the valve seat 52 to open, thereby increasing the ventilation area of ​​the first air duct 1101. When the temperature drops, the paraffin wax solidifies and contracts. The piston 63 returns to its original position under the action of the spring and puts the valve plate 5 and the valve seat 52 in the closed state. The above process is driven by the heat generated by the voice coil 15, without the need for additional energy. The diaphragm 62 can be made of oil-resistant fluororubber material, which can transmit pressure and completely seal, so as to reduce the contamination of the piston 63 and valve assembly after the paraffin wax cools down. In practical implementation, the thermal expansion and contraction of the paraffin material are affected by the heat conduction of the heat-conducting pillar 19 and the outer shell 16. In order to shorten the response delay of the paraffin material caused by the temperature difference between the outer shell 16, the heat-conducting pillar 19 and the voice coil 15 when the voice coil 15 is heated, on the one hand, thermally conductive silicone grease (thermal conductivity 2-8 W / m×K) can be filled between the outer shell 16 and the magnetic circuit system, that is, between the outer shell 16 and the washer 13, the magnet 12 and the T-shaped iron 1, which can significantly shorten the time constant of the heat transfer path between the voice coil 15 and the outer shell 16, and also shorten the response delay of the thermal expansion of the paraffin material. On the other hand, a fan can be integrated inside the subwoofer where the speaker is located, which can continue to blow for several minutes when the speaker is working or after it is turned off, forcibly cooling the outer shell 16 and the heat-conducting pillar 19, thereby shortening the response delay of the cooling and contraction of the paraffin material. Furthermore, those skilled in the art should understand that thermal damage to the voice coil is caused by a long-term cumulative temperature rise, rather than a transient spike. The response time of the aforementioned paraffin thermal expansion element (typically 3-10 seconds) is on the same order of magnitude as the thermal time constant of the voice coil, thus effectively following average temperature changes. Even with a delay of several seconds, the voice coil temperature remains far below the damage threshold in the first few seconds of a sudden high-power signal (copper wire can withstand 150-180℃ for a short time). Once the paraffin responds, the valve opens to control the temperature within a safe range. The delay in the contraction phase only affects the reset time after shutdown, which can be accelerated by active cooling from the subwoofer's internal fan without affecting the normal operation of the speaker.

[0029] Please see Figure 8As shown, the channel 64 includes a first flow channel 7, a transition flow channel 72, and a third flow channel 73 that are interconnected, wherein the cross-sectional area of ​​the third flow channel 73 is smaller than the cross-sectional area of ​​the first flow channel 7. By setting the cross-sectional area of ​​the third flow channel 73 to be smaller than that of the first flow channel 7, the radial displacement of the thermal expansion material 6 can be made larger when it is heated and expanded, thereby amplifying the thermal expansion transmission displacement of the thermal expansion material 6.

[0030] Please see Figure 5 and Figure 8 As shown, a second guide plate 8 is fixedly provided on the top of the valve plate 5; the surface of the second guide plate 8 is arc-shaped. The second guide plate 8 is designed so that when the airflow in the first air duct 1101 passes through the valve plate 5, the resistance and sudden change in direction it experiences can be reduced by the arc transition effect on the surface of the second guide plate 8, thereby reducing the airflow turbulence formed at the valve plate 5.

[0031] Please see Figure 7 and Figure 9 As shown, the outer wall of the outer shell 16 is fixedly provided with a notch 9; the bottom of the basin frame 14 is provided with a mark 92 corresponding to the position of the notch 9; When installing the housing 16, the interface on the side wall needs to be aligned with the second air duct 1102 on the magnet 12. This can be achieved by pre-aligning the notch 9 and the mark 92 on the basin 14 to position the housing 16 during installation, thereby improving the convenience and accuracy of the installation of the housing 16.

[0032] Please see Figure 9 As shown, a plurality of fins 10 are fixedly provided at the bottom of the outer shell 16 to increase the heat conduction area of ​​the outer shell 16; The fins 10 can increase the contact area between the outer shell 16 and the outside air, thereby improving the heat exchange capacity of the outer shell 16.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A subwoofer with a heat dissipation duct, characterized in that: include: A magnetic circuit system, comprising a washer (13), a magnet (12), and a T-shaped iron (1) fixedly arranged from top to bottom, wherein the T-shaped iron (1) comprises a central column (101) and a base (102) fixedly connected to each other. The vibration system includes a voice coil (15) and a diaphragm (17) fixedly connected to the voice coil (15), and a dust cover (18) is fixedly provided on the surface of the diaphragm (17). A skeleton system for housing and supporting the magnetic circuit system and the vibration system, the skeleton system including a basin frame (14) and a shell (16) fixedly connected to the basin frame (14). The air duct assembly is mounted on the magnetic circuit system to dissipate the heat generated by the voice coil (15) during operation; The air duct assembly includes a first air duct (1101) opened on the T-shaped iron (1) and a second air duct (1102) opened on the magnet (12). The first air duct (1101) is connected to the central column (101) and the base (102) along the axis, and the second air duct (1102) is arranged in a circular array on the magnet (12). The surface of the outer shell (16) is provided with an interface that communicates with the first air duct (1101) and the second air duct (1102), and the inner wall of the outer shell (16) is fixedly provided with a heat-conducting column (19) located inside the first air duct (1101).

2. A subwoofer with a heat dissipation duct according to claim 1, characterized in that: Multiple third air ducts (2) are provided at the bottom edge of the central column (101); the third air ducts (2) are arranged in a circular array on the central column (101).

3. A subwoofer with a heat dissipation duct according to claim 2, characterized in that: The inner wall of the dust cover (18) and the inner wall of the base (102) are both fixedly provided with a first guide plate (3), and the surface of the dust cover (18) is multi-hole; the first guide plate (3) is an inverted trumpet-shaped structure.

4. A subwoofer with a heat dissipation duct according to claim 2, characterized in that: The inner wall of the central column (101) is fixedly provided with a baffle (4); the baffle (4) has a spiral structure.

5. A subwoofer with a heat dissipation duct according to claim 1, characterized in that: The first air duct (1101) is provided with a thermal damper mechanism, the thermal damper mechanism comprising: A valve assembly for adjusting the ventilation area of ​​the first air duct (1101) includes a vertically movable valve plate (5), the bottom of which is provided with a tapered sealing surface, and the inner wall of the central column (101) is provided with a valve seat (52) that cooperates with the valve plate (5). A thermistor is disposed on a heat-conducting column (19) and is configured to drive the valve assembly to a first opening state when the temperature is below a first threshold and to drive the valve assembly to a second opening state when the temperature is above a second threshold.

6. A subwoofer with a heat dissipation duct according to claim 5, characterized in that: The thermal element includes a channel (64) disposed inside the heat-conducting column (19) and a piston (63), a diaphragm (62), and a thermal expansion material (6) disposed from top to bottom inside the channel (64). The diaphragm (62) is fixedly disposed inside the channel (64). One end of the piston (63) is fixedly connected to the diaphragm (62), and the other end is fixedly connected to the valve plate (5). The piston (63) is connected to the heat-conducting column (19) by a spring.

7. A subwoofer with a heat dissipation duct according to claim 6, characterized in that: The channel (64) includes a first flow channel (7), a transition flow channel (72), and a third flow channel (73) that are interconnected, wherein the cross-sectional area of ​​the third flow channel (73) is smaller than the cross-sectional area of ​​the first flow channel (7).

8. A subwoofer with a heat dissipation duct according to claim 5, characterized in that: The valve plate (5) is fixedly provided with a second guide plate (8) on its top; the surface of the second guide plate (8) is arc-shaped.

9. A subwoofer with a heat dissipation duct according to claim 1, characterized in that: The outer wall of the outer shell (16) is fixedly provided with a notch (9); the bottom of the basin frame (14) is provided with a mark (92) corresponding to the position of the notch (9).

10. A subwoofer with a heat dissipation duct according to claim 9, characterized in that: The bottom of the outer shell (16) is fixed with multiple fins (10) to increase the heat conduction area of ​​the outer shell (16).

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