Noise reduction structure of ventilation equipment

Abstract

The invention provides a noise reduction structure of ventilation equipment, and belongs to the technical field of ventilation devices.The noise reduction structure comprises a ventilation device body, the four edges of the ventilation device body are each provided with an anti-shaking module, the ends, far away from the ventilation device body, of the anti-shaking modules are provided with an outer frame, and the ventilation device body is located on the inner side of the outer frame; the anti-shaking module comprises a bearing plate installed at the upper end of the outer frame, a supporting unit is movably installed in the bearing plate, a second ring is movably installed on the supporting unit through a plurality of second connecting rods, a first circular truncated cone is movably installed in the inner ring of the second ring, and a connecting unit is installed on the first circular truncated cone. The noise reduction structure solves the problems that when a noise reduction structure of an existing ventilation device works, the device shakes due to rotation of fan blades, the shaking enables the device to generate noise, and then life of people is still affected.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation devices, and in particular relates to a noise reduction structure of ventilation equipment. Background Art

[0002] Ventilation, also known as air exchange, is the use of mechanical or natural methods to deliver enough fresh air into the indoor space, while expelling the dirty air that does not meet the hygiene requirements of the room, so that the indoor air meets the hygiene requirements and the needs of the production process. The various facilities in the building that complete the ventilation work are collectively called ventilation devices.

[0003] Prior art CN220417635U discloses a noise reduction structure for ventilation equipment, including a ventilation equipment noise reduction structure main body, the ventilation equipment noise reduction structure main body includes ventilation equipment, a protective noise reduction structure is arranged on the outside of the ventilation equipment, and a motor noise reduction structure is arranged inside the ventilation equipment; the protective noise reduction structure includes an installation protection unit and a noise reduction grid unit, the installation protection unit is arranged on both sides of the ventilation equipment, and the noise reduction grid unit is arranged inside the installation protection unit; the motor noise reduction structure includes a fixed shell unit and a sound insulation unit, the fixed shell unit is arranged on the outside of the ventilation equipment motor, and the sound insulation unit is arranged on the inside of the fixed shell unit. When reducing noise, the device is obliquely distributed through the protective grid, and the porous air guide plate and the sound-absorbing and noise-reducing folding plate form a double-layer partition, which has the effect of reducing noise in the air duct. The surface of the porous air guide plate has silencer holes, and the sound-absorbing and noise-reducing folding plate is a loose and porous sound-absorbing material, which absorbs the noise on both sides of the ventilation equipment and reduces the noise interference of the ventilation equipment. The mounting base plate is fixedly installed on the partition of the ventilation equipment by bolts, so that the fixed shell is sleeved and installed on the outside of the ventilation equipment motor to isolate the noise generated by the motor. At the same time, there are heat dissipation grooves between the fixed shells to effectively dissipate the heat of the motor. The sound insulation folding plate is inside the fixed shell. The sound insulation folding plate is a corrugated folding structure, which vibrates under noise to consume noise energy and increase the effect of sound insulation and noise reduction, thereby achieving the function of noise reduction. However, during the operation of the ventilation device, the rotation of the fan blades will cause the device to shake, and this shaking will cause the device to generate noise, which will still affect people's lives. Summary of the invention

[0004] The present invention provides a noise reduction structure for ventilation equipment, which aims to solve the problem that during operation, the noise reduction structure of the existing ventilation equipment will cause the device to shake due to the rotation of the fan blades, and this shaking will cause the device to generate noise, which will still affect people's lives.

[0005] An embodiment of the present invention provides a noise reduction structure of a ventilation device, comprising a ventilation device body, wherein an anti-shake module is installed on four sides of the ventilation device body, an outer frame is installed at one end of the anti-shake module that is farther from the ventilation device body, and the ventilation device body is located inside the outer frame;

[0006] The anti-shake module includes a supporting plate installed on the upper end of the outer frame, a supporting unit is movably installed in the supporting plate, a circle 2 is movably installed in the supporting unit via a plurality of connecting rods 2, a truncated table 1 is movably installed in the inner circle of the circle 2, and a connecting unit is installed on the truncated table 1.

[0007] Furthermore, the support unit comprises a support platform movably connected to the inside of the carrier plate, and a plurality of jitter reduction platforms are arranged in a circle at equal intervals around the support platform;

[0008] The end of the vibration reduction platform which is farther from the support platform is connected to the bearing plate, and a circle 1 which is in close contact with the vibration reduction platform is arranged on the upper wall of the support platform;

[0009] The connection unit comprises a connection rod 1 installed on the upper wall of the truncated cone 1, a truncated cone 2 is installed at the end of the connection rod 1 which is farther from the truncated cone 1, the upper end of the truncated cone 2 is connected with the lower end of the ventilation device body, and a plurality of round beads are arranged in a circle at equal intervals on the circumference of the truncated cone 2;

[0010] The jitter reduction platform comprises a bearing platform and an embedding interface, wherein the bearing platform is mounted on the upper wall surface of the bearing plate;

[0011] The vertical portion of the bending strip that can be movably clamped in the side wall of the bearing platform close to the supporting platform;

[0012] A spiral beryllium copper wire is clamped on the inner side of the vertical portion of the bending strip, and an end of the spiral beryllium copper wire farther from the bending strip is in close contact with the upper wall surface of the bearing plate;

[0013] The embedding interface is reserved at the upper end side of the support platform, the transverse part of the bending strip can be movably inserted in the embedding interface, the circle 1 is connected to the upper wall of the support platform via a plurality of tensioning screws, and the lower wall of the circle 1 is in close contact with the transverse part of the bending strip.

[0014] Furthermore, a concave opening is reserved on the side wall of the bearing platform close to the supporting platform, the mouth of the concave opening faces the supporting platform, the vertical portion of the bending strip can be movably clamped in the concave opening, the side of the mouth of the concave opening is laterally clamped with the concave strip, and a plurality of groups of circular holes paired with the concave strip are reserved on the upper wall of the supporting platform, the circular hole group includes a pair of circular holes, and the spacing between the pair of circular holes matches the spacing at both ends of the concave strip.

[0015] Furthermore, the distance between the left and right ends of the concave mouth, the distance between the left and right sides of the vertical portion of the bending strip and the distance between the left and right sides of the transverse portion of the bending strip are equal, and the span of the transverse portion of the bending strip is equal to the span of the vertical portion of the bending strip.

[0016] Furthermore, a circular opening is reserved on the inner circumferential surface of the circle 2, the vertical center line of the connecting rod 1, the vertical center line of the truncated cone 2, the vertical center line of the truncated cone 1 and the vertical center line of the circular opening coincide with each other, the radius of the outer side of the truncated cone 1 is smaller than the radius of the circular opening, and a plurality of spiral beryllium copper wires 2 are arranged at equal intervals in a circle on the outer surface of the truncated cone 1, and the end of the spiral beryllium copper wire 2 farther from the truncated cone 1 is connected to the inner surface of the circular opening.

[0017] Furthermore, the supporting platform, the bending strip, the circle one, the concave strip and the round table one are all made of stainless steel.

[0018] Furthermore, the ball is rotatably engaged on the circumferential surface of the second truncated cone, and the vertex of the ball extending out of the second truncated cone is on the same vertical circumferential surface as the outer circumferential surface of the second circle.

[0019] Furthermore, an assembly shell is clamped on the upper wall of the bearing plate, the upper end of the assembly shell is a square opening, the second frustum is outside the square opening of the upper end of the assembly shell, and the round ball is in close contact with the inner surface of the upper end of the assembly shell.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention can reduce the vibration generated by the ventilation device body through the installation of the anti-vibration module, and then reduce the noise caused by the vibration, thereby greatly improving the noise reduction function of the device.

[0022] 2. The present invention can reduce vibration from all directions through the installation of the supporting unit, the second circle and the connecting unit, thereby ensuring the stability of the ventilation device installed on the anti-vibration module; by adjusting the orientation of the bending strip assembly, it can realize the horizontal or vertical constraints of reducing vibration, and enhance the adaptability of the anti-vibration module to reduce vibration; the ball is screwed into the wall surface of the second truncated cone, so that the ball can rotate on the surface of the second truncated cone when it is subjected to vibration, which can reduce the loss of the ball and extend the working cycle of the ball, while also ensuring the function of reducing vibration.

[0023] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the three-dimensional structure of an anti-shake module according to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the internal structure of an anti-shake module according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the embedding interface structure of an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the structure of a jitter reduction platform according to an embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of a carrier platform according to an embodiment of the present invention;

[0031] Figure 7 It is a schematic diagram of the structure of circle 2 of an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the structure of the second spiral beryllium copper wire according to an embodiment of the present invention;

[0033] Figure numerals: 1. ventilation device body; 2. anti-shake module; 3. outer frame; 21. bearing plate; 22. supporting unit; 221. supporting platform; 222. shake reduction platform; 2221. bearing platform; 2222. bending strip; 2223. spiral beryllium copper wire one; 2224. embedding interface; 2225. round hole; 2226. concave mouth; 2227. concave strip; 2228. round hole group; 223. circle one; 2231. tensioning screw one; 23. circle two; 231. ring-shaped mouth; 24. truncated cone one; 241. spiral beryllium copper wire two; 25. connecting unit; 251. connecting rod one; 252. truncated cone two; 253. round ball; 26. connecting rod two; 27. assembly shell. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described in conjunction with the drawings of specific embodiments of the present invention. The same figure marks in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Reference Figure 1 An embodiment of the present invention proposes a noise reduction structure of a ventilation device, including a ventilation device main body 1, an anti-shake module 2 is installed on the four sides of the ventilation device main body 1, an outer frame 3 is installed at the end of the anti-shake module 2 farther from the ventilation device main body 1, and the ventilation device main body 1 is located on the inner side of the outer frame 3.

[0036] By installing the anti-shake module 2, the shaking of the ventilation device body 1 can be reduced, and then the noise caused by the shaking can be reduced, which greatly improves the noise reduction function of the device.

[0037] In addition, it should be noted that in this embodiment, four anti-shake modules 2 are provided, and the architecture of the four anti-shake modules 2 is exactly the same. Here, the anti-shake module 2 at the lower end of the ventilation device body 1 is taken as an example. Figure 2-Figure 4 The anti-shake module 2 includes a carrier plate 21 mounted on the upper end of the outer frame 3, a support unit 22 is movably mounted in the carrier plate 21, a circle 23 is movably mounted in the support unit 22 via a plurality of connecting rods 26, a round table 24 is movably mounted in the inner circle of the circle 23, and a connecting unit 25 is mounted on the round table 24; the support unit 22 includes a support platform 221 movably connected to the inside of the carrier plate 21, and a plurality of shake reduction platforms 222 are arranged at equal intervals in a circle shape on the circumference of the support platform 221; the end of the shake reduction platform 222 farther from the support platform 221 is connected to the carrier plate 21, and the support A circle 223 is arranged on the upper wall surface of the platform 221 and is in close contact with the vibration reduction platform 222; the connecting unit 25 includes a connecting rod 251 arranged on the upper wall surface of the truncated platform 24, a truncated platform 252 is arranged on the end of the connecting rod 251 farther from the truncated platform 24, the upper end of the truncated platform 252 is connected to the lower end of the ventilation device body 1, and a plurality of round beads 253 are arranged on the circumference of the truncated platform 252 in a circle at equal intervals; the round beads 253 are rotatably engaged on the circumference of the truncated platform 252, and the vertex of the round beads 253 extending out of the truncated platform 252 is on the same vertical circumferential surface as the outer circumferential surface of the circle 23.

[0038] Before use, first install one end of the anti-shake module 2 on the ventilation device, and then install the other end of the anti-shake module 2 on the outer frame 3; when the ventilation device shakes vertically, the shaking is transmitted to the frustum 252, the connecting rod 1 251, the frustum 1 24 and the circle 2 23 in sequence, and then transmitted to the supporting unit 22 and the supporting plate 21. The shaking reduction platform 222 on the supporting unit 22 can reduce the shaking.

[0039] When the ventilation device vibrates laterally, it can pull the connecting rod 1 251 and the round table 252 to change laterally; the round ball 253 on the surface of the round table 252 can prevent the round table 252 from vibrating violently and colliding with the parts on the side of the round table 252, and then protect the round table 252; and because the round ball 253 is movably connected to the surface of the round table 252, when the round ball 253 is on the outer part of the round table 252 and touches the parts on the side of the round table 252, the round ball 253 is compressed and can 2, which can weaken the collision with the truncated cone 252 and the loss of the ball 253, extend the working cycle of the ball 253, and also ensure the function of reducing the vibration; at this time, according to the direction of the vibration, the truncated cone 1 24 moves laterally in the inner circle of the circle 23, and compresses the spiral beryllium copper wire 241 in the corresponding direction, thereby reducing the vibration; when the vibration disappears, the spiral beryllium copper wire 241 returns to its original position, and then the truncated cone 1 24 can return to its original position in the inner circle of the circle 23, thereby ensuring the stability of the ventilation device.

[0040] A spiral beryllium copper wire 3 is also installed at one end of the support platform 221 movably installed in the support plate 21. The spiral beryllium copper wire 3 can move vertically. An assembly platform is installed at the end of the spiral beryllium copper wire 3 farther from the support platform 221. The lower wall of the assembly platform is flush with the lower wall of the support plate 21, so that when the support platform 221 is subjected to the same vertical shaking as the support platform 221, the support platform 221 can press the spiral beryllium copper wire and then reduce the shaking.

[0041] Reference Figure 2-Figure 8The jitter reduction platform 222 includes a support platform 2221 and an embedding interface 2224. The support platform 2221 is installed on the upper wall of the support plate 21. The support platform 2221 is close to the side wall of the support platform 221 and is movably connected to the vertical portion of the bending strip 2222. The inner side of the vertical portion of the bending strip 2222 is connected to the spiral beryllium copper wire 2223. The end of the spiral beryllium copper wire 2223 that is farther from the bending strip 2222 is in close contact with the upper wall of the support plate 21. The embedding interface 2224 is reserved at the upper side of the support platform 221, and the transverse part of the bending strip 2222 can be movably inserted into the embedding interface 2224. The circle 223 is connected to the upper wall of the support platform 221 through a plurality of tensioning screws 2231, and the lower wall of the circle 223 is in close contact with the transverse part of the bending strip 2222; a concave opening 2226 is reserved on the side wall of the support platform 2221 close to the support platform 221, and the mouth of the concave opening 2226 faces the support platform 221. The vertical part of the support platform 221 and the bending strip 2222 can be movably connected to the concave opening 2226, and the side of the concave opening 2226 is connected to the concave strip 2227 in a horizontal manner. A plurality of groups of round hole groups 2228 are reserved on the upper wall of the support platform 221 to match the concave strip 2227. The round hole group 2228 includes a pair of round holes 2225. The spacing between the pair of round holes 2225 matches the spacing between the two ends of the concave strip 2227. A circular opening 231 is reserved, and the vertical center lines of the connecting rod 1 251, the vertical center lines of the second cone 252, the vertical center lines of the cone 1 24 and the circular opening 231 coincide with each other. The radius of the outer side of the cone 1 24 is smaller than the radius of the circular opening 231. A plurality of spiral beryllium copper wires 241 are arranged at equal intervals on the outer surface of the cone 1 24 in a circular shape, and the end of the spiral beryllium copper wire 241 farther from the cone 1 24 is connected to the inner surface of the circular opening 231.

[0042] Before use, adjust the assembly positions of the vertical and horizontal parts of the bending strip 2222 according to the vibration direction of the ventilation device. When the ventilation device vibrates vertically, snap the vertical part of the bending strip 2222 into the concave opening 2226, and movably insert the horizontal part of the bending strip 2222 into the corresponding embedding interface 2224 on the support platform 221. Then, assemble the circle 1 223 so that the lower wall surface of the circle 1 223 and the horizontal end of the bending strip 2222 are in close contact, that is, the horizontal part of the bending strip 2222 can be fixedly connected to the support platform 221. At this time, the spiral beryllium copper wire 1 2223 is in close contact with the vertical part of the bending strip 2222. Under the action, it is tightly attached to the upper wall of the supporting plate 21; then the two ends of the concave strip 2227 are embedded in the two sides of the concave mouth 2226; under the cooperation of shaking, the vertical part of the bending strip 2222 moves in the middle of the concave mouth 2226 toward the side close to the upper wall of the supporting plate 21, and compresses the spiral beryllium copper wire 2223, thereby reducing the shaking; because the two ends of the concave strip 2227 are embedded in the two sides of the mouth of the concave mouth 2226, when the spiral beryllium copper wire 2223 is subjected to the compression shape change, the concave strip 2227 can constrain the travel of the lateral part of the bending strip 2222 moving toward the side close to the upper wall of the supporting plate 21.

[0043] Because the spacing between the left and right ends of the concave opening 2226, the spacing between the left and right sides of the vertical portion of the bending strip 2222 and the spacing between the left and right sides of the horizontal portion of the bending strip 2222 are all equal, and the span of the horizontal portion of the bending strip 2222 and the span of the vertical portion of the bending strip 2222 are equal; therefore, the horizontal portion of the bending strip 2222 or the vertical portion of the bending strip 2222 can be assembled in the concave opening 2226; when the ventilation device produces lateral shaking, the original horizontal portion of the bending strip 2222 is snapped into the concave opening 2226, and the original vertical portion of the bending strip 2222 is movably inserted into the corresponding embedding interface 2224 on the upper wall of the support platform 221, and then the circle 1 223 is assembled. At this moment, the spiral beryllium The copper wire 2223 is tightly attached to the inner surface of the concave opening 2226 with the cooperation of the original lateral part of the bending strip 2222, and then the two ends of the concave strip 2227 are respectively embedded in the two sides of the opening of the concave opening 2226. At this moment, the opening of the concave strip 2227 faces the supporting platform 2221. With the cooperation of shaking, when the ventilation device changes laterally, it can pull the supporting platform 221 to change laterally, and then compress the spiral beryllium copper wire 2223 at the corresponding position, and then reduce the lateral shaking of the ventilation device. The round table 24 can change laterally in the ring-shaped opening 231, compressing the spiral beryllium copper wire 2 241 at the corresponding position, which can reduce the shaking of the round table 24 in the horizontal direction. The supporting platform 2221, the bending strip 2222, the circle 223, the concave strip 2227 and the truncated table 24 are all made of stainless steel to prevent the anti-shake module 2 from changing its shape and moving, and also to achieve the purpose of reducing the shake; the supporting platform 221 is made of tpe material to ensure that when the ventilation device generates lateral shaking force, the shape of the supporting platform 221 changes, and then the bending strip 2222 in the corresponding position can achieve the purpose of reducing the shake.

[0044] Reference Figure 2-Figure 4 The upper wall of the bearing plate 21 is also hooped with an assembly shell 27, and the upper end of the assembly shell 27 is a square opening, and the second frustum 252 is outside the square opening at the upper end of the assembly shell 27, and the round ball 253 is in close contact with the inner surface of the upper end of the assembly shell 27; the lower end of the assembly shell 27 can be connected to the upper wall of the bearing plate 21 through a plurality of tensioning screws 2; when working, only the anti-shake module 2 needs to reduce the vibration in the vertical direction, and the assembly shell 27 can be hooped outside the bearing plate 21. At this time, the second frustum 252 can pass through the opening at the upper end of the assembly shell 27, and the anti-shake module 2 can be assembled on the ventilation device. When the ventilation device generates vertical vibration, the second frustum 252 and the support platform 221 can be compressed, and then the vibration can be reduced; and when the upper wall of the second frustum 252 is level with the upper end of the assembly shell 27, the assembly shell 27 can bear the ventilation device, and then ensure the stability of the ventilation device.

[0045] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A noise reduction structure of a ventilation device, comprising a ventilation device body (1), characterized in that: An anti-shake module (2) is installed on each of the four sides of the ventilation device body (1); an outer frame (3) is installed on the end of the anti-shake module (2) that is farther from the ventilation device body (1); and the ventilation device body (1) is located on the inner side of the outer frame (3); The anti-shake module (2) comprises a carrier plate (21) mounted on the upper end of the outer frame (3), a support unit (22) being movably mounted in the carrier plate (21), a circle (23) being movably mounted in the support unit (22) via a plurality of connecting rods (26), a truncated platform (24) being movably mounted in the inner circle of the circle (23), and a connecting unit (25) being mounted on the truncated platform (24).

2. The noise reduction structure of a ventilation device according to claim 1, characterized in that: The supporting unit (22) comprises a supporting platform (221) which is movably clamped inside the carrying plate (21), and a plurality of vibration reduction platforms (222) are arranged in a circle at equal intervals around the supporting platform (221); The end of the vibration reduction platform (222) which is farther from the support platform (221) is connected to the bearing plate (21), and a circle (223) which is in close contact with the vibration reduction platform (222) is arranged on the upper wall surface of the support platform (221); The connection unit (25) comprises a connection rod (251) mounted on the upper wall of the first truncated cone (24); a second truncated cone (252) is mounted on the end of the connection rod (251) that is farther from the first truncated cone (24); the upper end of the second truncated cone (252) is connected to the lower end of the ventilation device body (1); and a plurality of round beads (253) are arranged in a circle at equal intervals on the circumference of the second truncated cone (252); The jitter reduction platform (222) comprises a bearing platform (2221) and an embedding interface (2224), wherein the bearing platform (2221) is mounted on the upper wall surface of the bearing plate (21); The vertical portion of the bending strip (2222) can be movably clamped in the side wall of the bearing platform (2221) close to the supporting platform (221); A spiral beryllium copper wire (2223) is clamped inside the vertical portion of the bending strip (2222), and an end of the spiral beryllium copper wire (2223) that is farther from the bending strip (2222) is in close contact with the upper wall surface of the bearing plate (21); The embedding interface (2224) is reserved on the upper side of the support platform (221); the transverse portion of the bending strip (2222) can be movably inserted into the embedding interface (2224); the circle one (223) is connected to the upper wall of the support platform (221) via a plurality of tensioning screws (2231); the lower wall of the circle one (223) is in close contact with the transverse portion of the bending strip (2222).

3. The noise reduction structure of a ventilation device according to claim 2, characterized in that: A concave opening (2226) is reserved on the side wall of the bearing platform (2221) close to the supporting platform (221), the opening of the concave opening (2226) faces the supporting platform (221), the vertical portion of the bending strip (2222) is movably engaged in the concave opening (2226), the side of the opening of the concave opening (2226) is laterally engaged with the concave strip (2227), and a plurality of groups of round hole groups (2228) paired with the concave strip (2227) are reserved on the upper wall of the supporting platform (221), the round hole group (2228) includes a pair of round holes (2225), and the spacing between the pair of round holes (2225) matches the spacing between the two ends of the concave strip (2227).

4. The noise reduction structure of a ventilation device according to claim 3, characterized in that: The spacing between the left and right ends of the concave opening (2226), the spacing between the left and right sides of the vertical portion of the bending strip (2222) and the spacing between the left and right sides of the horizontal portion of the bending strip (2222) are all equal, and the span of the horizontal portion of the bending strip (2222) is equal to the span of the vertical portion of the bending strip (2222).

5. The noise reduction structure of a ventilation device according to claim 3, characterized in that: A circular opening (231) is reserved on the inner circumference of the circle 2 (23); the vertical center line of the connecting rod 1 (251), the vertical center line of the truncated cone 2 (252), the vertical center line of the truncated cone 1 (24) and the vertical center line of the circular opening (231) coincide; the radius of the outer side of the truncated cone 1 (24) is smaller than the radius of the circular opening (231); a plurality of spiral beryllium copper wires 2 (241) are arranged at equal intervals in a circular shape on the outer surface of the truncated cone 1 (24); the end of the spiral beryllium copper wire 2 (241) which is farther from the truncated cone 1 (24) is connected to the inner surface of the circular opening (231).

6. The noise reduction structure of a ventilation device according to claim 5, characterized in that: The support platform (2221), the bending strip (2222), the circle one (223), the concave strip (2227) and the round platform one (24) are all made of stainless steel.

7. The noise reduction structure of a ventilation device according to claim 2, characterized in that: The ball (253) is rotatably engaged with the circumference of the second truncated cone (252); the vertex of the ball (253) extending out of the second truncated cone (252) is on the same vertical circumferential surface as the outer circumferential surface of the second circle (23).

8. The noise reduction structure of a ventilation device according to claim 2, characterized in that: The upper wall surface of the bearing plate (21) is also connected to a mounting shell (27), the upper end of the mounting shell (27) is a square opening, the second frustum (252) is located outside the square opening at the upper end of the mounting shell (27), and the round ball (253) is in close contact with the inner surface of the upper end of the mounting shell (27).

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