An adjustable muffler

Abstract

The present invention discloses an adjustable muffler, comprising a muffler, a driving mechanism installed in the muffler and a plurality of muffler parts, wherein a muffler channel is formed between the plurality of muffler parts, and the driving mechanism is used to drive the plurality of muffler parts to move toward the center of the muffler channel; the driving mechanism and muffler parts provided by the present invention can drive the plurality of muffler parts to move toward the center of the muffler channel through the driving mechanism when the power of the fan is increased, thereby reducing the diameter of the muffler channel, that is, when the muffler channel becomes narrower, the speed of the gas or fluid in the muffler channel will increase. According to the law of the speed of sound, the speed of sound is related to the density and pressure of the medium, and the speed of the gas or fluid in the narrowed channel increases, resulting in changes in density and pressure, which in turn affects the speed of sound. A higher speed of sound can reduce the time for sound waves to propagate in the channel, thereby achieving a better muffler effect.

Description

Technical Field

[0001] The invention relates to the technical field of muffler equipment, in particular to an adjustable muffler. Background Art

[0002] The working principle of mufflers is to reduce the spread of noise by absorbing, reflecting or isolating the energy of noise. They usually use sound-absorbing materials to absorb sound wave energy, such as foam materials, fiberboard, glass fiber, ceramic fiber, etc. Sound-absorbing materials can convert the mechanical energy of sound into heat energy, thereby reducing the spread of sound.

[0003] For example, a patent with publication number CN106368986B and publication date February 1, 2019 discloses a fan silencer, which relates to the technical field of silencer equipment, including a diffuser with a porous cylinder inside the diffuser, and sound-absorbing cotton is arranged between the diffuser and the diffuser with porous cylinder; the lower part of the diffuser is connected to the lower diffuser cone outer cylinder, the inner side of the lower diffuser cone outer cylinder is provided with a lower diffuser cone inner porous plate, sound-absorbing cotton is arranged between the lower diffuser cone outer cylinder and the lower diffuser cone inner porous plate, and the lower end of the lower diffuser cone outer cylinder is connected to the air inlet; a first-level sound-absorbing An outer tube, a first-level sound-absorbing outer tube is provided inside a first-level sound-absorbing porous plate inner tube, sound-absorbing cotton is provided between the first-level sound-absorbing outer tube and the first-level sound-absorbing porous plate inner tube, the lower ends of the first-level sound-absorbing outer tube and the first-level sound-absorbing porous plate inner tube are connected to the air inlet, and diversion holes are provided on the first-level sound-absorbing outer tube and the first-level sound-absorbing porous plate inner tube; the upper part of the diffusion tube is connected to the upper cone outer tube, an upper cone inner porous plate is provided inside the upper cone outer tube, sound-absorbing cotton is provided in the upper cone outer tube and the upper cone inner porous plate, the upper parts of the upper cone outer tube and the upper cone inner porous plate are connected to the air outlet, and overflow holes are provided on the upper cone outer tube and the upper cone inner porous plate.

[0004] Most of the existing fan silencers are installed at the air inlet or outlet of the fan. Since the fan adjusts its own power according to different situations in different usage environments, which is what we commonly call gear shifting, the increase in power will cause an increase in the air outlet and air inlet, which will also cause an increase in noise. Since the existing silencer volume is fixed, it is difficult for the silencer to eliminate the increased noise after the power and noise of the fan increase, which affects the silencing treatment of the fan. Summary of the invention

[0005] The object of the present invention is to provide an adjustable muffler to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an adjustable muffler, comprising a muffler, a driving mechanism installed in the muffler and a plurality of mufflers, a muffler channel is formed between the plurality of mufflers, and the driving mechanism is used to drive the plurality of mufflers to move toward the center of the muffler channel.

[0007] Preferably, the sound-absorbing element is made of a flexible material.

[0008] Preferably, a support plate is installed in the silencer, the support plate is movably installed in the silencer, the silencer is installed on the surface of the support plate, and the driving mechanism is connected to the support plate.

[0009] Preferably, the support plate is rotatable within the silencer.

[0010] Preferably, the driving mechanism includes a driving motor, a fixed disk and a rotating disk, which are respectively located at the openings at both ends of the silencer, the fixed disk is fixedly connected in the silencer, the rotating disk is rotatably connected to the inner wall of the silencer, the support plate and the silencer are both located between the fixed disk and the rotating disk, a gear ring is installed on the outer wall of the turntable, the driving motor is fixedly connected to the inner wall of the silencer, a gear is installed on the output shaft of the driving motor, the gear is meshed with the gear ring, a guide groove is opened on the turntable, a passive groove is installed on the fixed disk, sliders are installed at both ends of the support plate, two groups of sliders are located in the guide groove and the passive groove, and form a sliding guide cooperation with the guide groove and the passive groove, and a guide inclined surface is provided on the silencer.

[0011] Preferably, the combination of the support plate and the silencer is in the shape of an arrow.

[0012] Preferably, a plurality of silencers are circularly arranged around the silencer cylinder.

[0013] Preferably, a sealing member is also installed in the silencer, and the sealing member is used to seal the gap between the support plate and the adjacent silencer.

[0014] Preferably, the sealing member comprises a sealing plate and an elastic member, the sealing plate is rotatably mounted on a side of the supporting plate away from the silencer, and two ends of the elastic member are respectively connected to the fixing disk and the sealing plate.

[0015] Preferably, a rubber pad is installed on a side of the sealing plate away from the supporting plate.

[0016] The beneficial effect of the present invention is that in the above technical scheme, the driving mechanism and silencer provided by the present invention, when the power of the fan is increased, can drive a number of sound parts to move toward the center of the silencer channel through the driving mechanism, thereby reducing the diameter of the silencer channel. That is, when the silencer channel becomes narrower, the speed of the gas or fluid in the silencer channel will increase. According to the law of the speed of sound, the speed of sound is related to the density and pressure of the medium. The speed of the gas or fluid in the narrowed channel increases, resulting in changes in density and pressure, which in turn affects the speed of sound. A higher sound speed can reduce the time for sound waves to propagate in the channel, thereby achieving a better sound reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the structure of a silencer provided in an embodiment of the present invention;

[0019] Figure 2 A cross-sectional view of a silencer provided in an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a fixed disk and a rotating disk provided in an embodiment of the present invention;

[0021] Figure 4 The embodiment of the present invention provides Figure 2 A in the enlarged view;

[0022] Figure 5 A cross-sectional view of a support plate and a muffler provided in an embodiment of the present invention;

[0023] Figure 6 The embodiment of the present invention provides Figure 5 The enlarged view of point B in the figure;

[0024] Figure 7 A comparison diagram of the support plate and the silencer provided in an embodiment of the present invention in a first state and a second state.

[0025] Description of reference numerals:

[0026] 1. Silencer; 2. Driving mechanism; 21. Driving motor; 22. Gear; 23. Fixed plate; 24. Turntable; 25. Guide groove; 26. Passive groove; 27. Limiting groove; 28. Gear ring; 3. Silencer; 31. Silencer cotton; 4. Silencer channel; 5. Support plate; 51. Slider; 6. Sealing element; 61. Elastic rope; 62. Sealing plate; 7. Adjusting element; 71. Electromagnetic block; 72. Limiting block. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] like Figure 1-Figure 7 As shown, an adjustable silencer provided by an embodiment of the present invention includes a silencer cylinder 1, a driving mechanism 2 installed in the silencer cylinder 1 and a plurality of silencer components 3, a silencer channel 4 is formed between the plurality of silencer components 3, and the driving mechanism 2 is used to drive the plurality of silencer components 3 to move toward the center of the silencer channel 4.

[0030] Specifically, the silencer 1 can be detachably installed on the air outlet or air inlet of the fan. The detachable installation method can be selected from bolts, snaps, etc. The driving mechanism 2 and the silencer 3 are both installed inside the silencer 1. At least two groups of silencers 3 are provided, and a silencer channel 4 is formed between the multiple groups of silencers 3. The driving mechanism 2 is used to drive the plurality of silencers 3 to move toward the center of the silencer channel 4. In this embodiment, the silencer 3 can be a sound-absorbing or sound-insulating component such as a silencer cotton 31 and a silencer sheet. The length direction of the silencer 3 is consistent with the length direction of the silencer 1. The output shaft of the driving mechanism 2 is connected to the silencer 3. The driving mechanism 2 can be a linear driving device such as a cylinder and an electric telescopic rod. In actual use, preferably, the silencer 3 is provided with four groups, and the four groups of silencers The sound pieces 3 are in the shape of a hollow quadrangular prism, and a quadrangular prism-shaped silencer channel 4 is formed between the four groups of silencers 3. When the staff increases the power of the fan, the staff can drive the two opposite groups of silencers 3 to approach each other through the driving mechanism 2, thereby reducing the distance between the two opposite groups of silencers 3. The space of the silencer channel 4 is squeezed and shrunk by the two groups of silencers 3 approaching each other, that is, it becomes narrower. As the silencer channel 4 becomes narrower, the speed of the gas or fluid in the silencer channel 4 will increase. According to the law of the speed of sound, the speed of sound is related to the density and pressure of the medium. In the narrowed channel, the speed of the gas or fluid increases, resulting in changes in density and pressure, which in turn affects the speed of sound. A higher speed of sound can reduce the time for sound waves to propagate in the channel, thereby achieving a better silencer effect.

[0031] Furthermore, the sound-absorbing member 3 is made of a flexible material.

[0032] Specifically, in the present embodiment, the silencer 3 may be a flexible sound-absorbing or sound-isolating component such as silencer cotton 31 and a silencer sheet. The silencer 3 is initially in an outwardly convex semi-cylindrical shape. During actual use, after the staff increases the power of the fan, the staff can drive the silencer 3 to deform through the driving mechanism 2. Since the silencer 3 is initially in a semi-cylindrical shape, the extension of the output shaft of the driving mechanism 2 will force the silencer 3 to deform, causing it to change from a convex arc structure to an inwardly concave arc structure. At this time, the space of the silencer channel 4 is squeezed and reduced by the concavity of the silencer 3. According to the above-mentioned law of the speed of sound, the narrowing and reduction of the silencer channel 4 can achieve a better sound-absorbing effect.

[0033] It should be additionally explained that the silencer provided in each embodiment of the present invention is an adjustable silencer, which does not necessarily require that the silencer channel 4 is small when the wind speed is high. Obviously, this increases the wind resistance and brings negative effects. The comparative examples below are not necessarily corresponding requirements. Instead, each embodiment of the present invention provides a silencer with adjustable silencer effect, so that corresponding adjustments can be made when needed. It provides an adjustable capability, but it does not mean that it must be combined with a better silencer effect when the wind speed is higher. It can obviously be actively or dynamically selected based on actual needs.

[0034] Furthermore, a support plate 5 is installed in the silencer 1 , the support plate 5 is movably installed in the silencer 1 , the silencer 3 is installed on the surface of the support plate 5 , and the driving mechanism 2 is connected to the support plate 5 .

[0035] Specifically, the support plate 5 is movably installed in the silencer 1, and the silencer 3 is installed on a side of the support plate 5 close to the center of the silencer 1. The movable connection between the support plate 5 and the silencer 1 can be a sliding connection. A slide groove is opened inside the silencer 1, and a slider 51 is installed on the support plate 5. The slider 51 is arranged in the slide groove and forms a sliding guide with the slide groove. In this embodiment, the driving mechanism 2 is a linear driving device such as a cylinder and an electric telescopic rod. When the driving mechanism 2 drives the two relative groups of support plates 5 to approach each other (that is, when they move toward the center of the silencer 1), the distance between the two corresponding groups of silencers 3 is reduced, and the silencer channel 4 is also narrowed. According to the above-mentioned law of the speed of sound, the narrowing of the silencer channel 4 can achieve a better silencer effect.

[0036] Furthermore, the support plate 5 can rotate inside the silencer 1 .

[0037] In an optional embodiment, preferably, the driving mechanism 2 includes a driving motor 21, a fixed disk 23 and a rotating disk 24, the fixed disk 23 and the rotating disk 24 are respectively located at the openings at both ends of the silencer 1, the fixed disk 23 is fixedly connected in the silencer 1, the rotating disk 24 is rotatably connected to the inner wall of the silencer 1, the support plate 5 and the silencer 3 are both located between the fixed disk 23 and the rotating disk 24, a gear ring 28 is coaxially installed on the side wall of the rotating disk 24, the driving motor 21 is fixedly connected to the inner wall of the silencer 1, a gear 22 is installed on the output shaft of the driving motor 21, the gear 22 is meshed with the gear ring 28, a guide groove 25 is opened on the rotating disk 24, a passive groove 26 is installed on the fixed disk 23, sliders 51 are installed at both ends of the support plate 5, two groups of sliders 51 are respectively located in the guide groove 25 and the passive groove 26, and form a sliding guide fit with the guide groove 25 and the passive groove 26, and a guide inclined surface is provided on the silencer 3.

[0038] Specifically, the fixed disk 23 and the rotating disk 24 are respectively located at the openings at both ends of the silencer 1, the fixed disk 23 is fixedly connected to the silencer 1, the rotating disk 24 is rotatably connected to the inner wall of the silencer 1, the support plate 5 and the silencer 3 are located between the fixed disk 23 and the rotating disk 24, the silencer 3 is a silencer cotton 31, and the silencer cotton 31 is located on the side of the support plate 5 close to the silencer channel 4. A guide groove 25 is opened on the rotating disk 24, and a passive groove 26 is installed on the fixed disk 23. The guide groove 25 is inclined on the rotating disk 24, and the groove direction of the passive groove 26 is toward the center line of the silencer 1, that is, along the radial direction, so that The directions of the guide groove 25 and the passive groove 26 are inconsistent. Both sets of sliders 51 are cylindrical structures, and their diameters are slightly smaller than the groove widths of the guide groove 25 and the passive groove 26. Therefore, the sliders 51 can not only slide in the guide groove 25 and the passive groove 26, but also rotate in the guide groove 25 and the passive groove 26. In actual use, the initial state of the silencer cotton 31 before rotation is the first state, at which the silencer channel 4 is in the maximum open state. In the first state, the two sets of sliders 51 are respectively located at the upper ends of the guide groove 25 and the passive groove 26, at which time the combination of the plurality of silencers 3 is in the shape of a polygonal column;

[0039] After the sound-absorbing cotton 31 rotates, it is in the second state, the sound-absorbing cotton 31 and the support plate 5 extend into the sound-absorbing channel 4, and the adjacent sound-absorbing cottons 31 overlap each other, which not only reduces the size of the sound-absorbing channel 4, but also indirectly increases the length of the sound wave penetrating the sound-absorbing cotton 31, that is, indirectly increases the thickness of the sound-absorbing cotton 31;

[0040] When the silencer cotton 31 rotates from the first state to the second state, the driving mechanism 2 drives the gear 22 on the output shaft to rotate, the rotation of the gear 22 drives the gear ring 28 to rotate, the gear ring 28 drives the turntable 24 to rotate synchronously in the silencer cylinder 1, and the rotation of the turntable 24 drives the slider 51 thereon to move from the upper end to the lower end of the guide groove 25, so that the support plate 5 and the silencer cotton 31 move into the silencer channel 4 as a whole, and at the same time, the slider 51 in the passive groove 26 also moves from gradually to the side close to the silencer channel 4. In the process of moving, due to the silencer cotton 31 A guiding slope is provided on the top, and the sound-absorbing cotton 31 is placed on the guiding slope of the adjacent sound-absorbing cotton 31 in the first state, so under the drive of the guiding slope, the sound-absorbing cotton 31 and the support plate 5 are forced to rotate when moving toward the center of the sound-absorbing channel 4, and the support plate 5 slides on the guiding slope of the adjacent sound-absorbing cotton 31. As the sound-absorbing cotton 31 continues to move into the sound-absorbing channel 4, the space in the sound-absorbing channel 4 is gradually squeezed and reduced, and the rotation of the sound-absorbing cotton 31 and the support plate 5 during the movement gradually increases the overlapping parts of the adjacent sound-absorbing cotton 31.

[0041] like Figure 7 As shown, the upper part of the figure shows the silencer cotton 31 and the support plate 5 in the first state, and the lower part of the figure shows the silencer cotton 31 and the support plate 5 in the second state. The direction of the arrow is the penetration direction of the sound wave, and the dotted line part is the length of the sound wave penetrating the silencer cotton 31 in the first state and the second state. As shown in the comparison in the figure, when the silencer cotton 31 and the support plate 5 rotate from the first state to the second state, when the sound wave penetration direction remains unchanged, due to the rotation of the silencer cotton 31 and the support plate 5 and the superposition between adjacent silencer cottons 31, the length required for the sound wave to penetrate the silencer cotton 31 gradually increases, so the time for the sound wave to pass through the silencer cotton 31 also becomes longer, the thickness of the silencer cotton 31 is indirectly increased, and its sound absorption surface area is indirectly increased, thereby achieving better absorption of sound wave energy. As shown above, during the movement and rotation of the silencer cotton 31 and the support plate 5, not only can the size of the silencer channel 4 be adjusted, but also the thickness of the silencer cotton 31 can be indirectly increased, thereby further increasing the sound wave absorption and noise reduction processing.

[0042] Furthermore, the combination of the support plate 5 and the silencer 3 is in the shape of an arrow.

[0043] Specifically, the combination of the support plate 5 and the silencer 3 is in the shape of an arrow, so the two side surfaces of the silencer cotton 31 and the support plate 5 are provided with guide slopes, and in the process of the silencer cotton 31 and the support plate 5 rotating from the first state to the second state, the guide slope of the support plate 5 on the side away from the silencer cotton 31 is attached to the guide slope of the adjacent silencer cotton 31, so in the process of the movement of the support plate 5 and the silencer 3, the adjacent support plates 5 and the silencer 3 form a wedge-shaped fit like a wedge block, and under the action of the wedge-shaped fit, the support plate 5 and the silencer 3 are driven to rotate during the movement, and in the process of the wedge-shaped fit, the support plate 5 and the adjacent silencer cotton 31 can also be sealed to a certain extent.

[0044] Furthermore, a plurality of silencers 3 are circularly arranged around the silencer tube 1 .

[0045] Specifically, a plurality of silencers 3 are circularly arranged around the silencer tube 1. Because each group of silencers 3 and support plates 5 will move toward the center of the silencer channel 4 when rotating to the second state, the movement directions of the plurality of silencers 3 and support plates 5 are different, all of which are different radial directions of the silencer tube 1. Because of the wedge-shaped fit between the support plates 5 and adjacent silencers 3, when each group of silencers 3 and support plates 5 move synchronously toward the center of the silencer channel 4, the support plates 5 and silencers 3 use the guide slopes thereon to squeeze the adjacent support plates 5, so that the adjacent support plates 5 rotate, and during the rotation, the guide slopes on the adjacent support plates 5 and silencers 3 fit each other and slide on the guide slopes during the rotation. Therefore, when the support plates 5 and silencers 3 rotate, not only can the size of the silencer channel 4 and the thickness of the silencer cotton 31 be adjusted, but also the gap between the adjacent support plates 5 and silencers 3 can be narrowed to reduce the propagation of sound waves from the gap.

[0046] In another embodiment of the present invention, a sealing member 6 is further installed in the silencer 1 , and the sealing member 6 is used to seal the gap between the supporting plate 5 and the adjacent silencer 3 .

[0047] Specifically, the sealing member 6 is installed on the support plate 5. In this embodiment, the silencer 3 is a flexible silencer cotton 31, and the sealing member 6 can be an airbag. The airbag is installed on the side of the support plate 5 away from the surface silencer cotton 31 and is attached to the surface of the adjacent silencer cotton 31. An electric-controlled exhaust valve and an electric-controlled inflation valve are installed on the airbag. This is a prior art and will not be described in detail. When the silencer cotton 31 and the support plate 5 are in the first state and the second state and are used, the airbag is in an inflated expansion state. The expansion of the airbag squeezes the adjacent silencer cotton 31, and the support plate 5 is sealed by the airbag. When the silencer cotton 31 and the support plate 5 rotate from the first state to the second state, the electronically controlled exhaust valve discharges the air in the airbag. At this time, the airbag is in a deflated state. The contraction of the airbag opens the gap between the support plate 5 and the adjacent support plate 5 to allow the support plate 5 to slide on the guide slope of the silencer cotton 31. When the silencer cotton 31 and the support plate 5 rotate to the second state, the electronically controlled inflation valve fills the air into the airbag. The whole process is simple and convenient, and can achieve the sealing of the support plate 5 and the adjacent silencer cotton 31 before and after adjustment.

[0048] In an optional embodiment, preferably, the sealing member 6 includes a sealing plate 62 and an elastic member, the sealing plate 62 is rotatably mounted on a side of the supporting plate 5 away from the silencer 3, and both ends of the elastic member are respectively connected to the fixing disk 23 and the sealing plate 62.

[0049] Specifically, the sealing plate 62 is rotatably mounted on a side of the support plate 5 away from the silencer 3, and the two ends of the elastic member are respectively connected to the fixed disk 23 and the sealing plate 62. The elastic member can be an elastic telescopic structure such as an elastic rope 61 and a spring, preferably an elastic rope 61, one end of the elastic rope 61 is connected to the fixed disk 23, and the connection between the elastic rope 61 and the fixed disk 23 is located on one side of the distal end portion close to the passive groove 26 (the end portion located at the edge of the fixed disk 23), and the other end is connected to the sealing plate 62. The end of the sealing plate 62 away from the elastic rope 61 is rotatably connected to the support plate 5 through a hinge shaft, and a torsion spring is installed at the rotating connection. When the support plate 5 is in the first state, the elastic rope 61 and the torsion spring are both in a natural state. The length direction of the elastic rope 61 is consistent with the radial direction of the silencer 1, and the sealing plate 62 is attached to the support plate 5. When the support plate 5 and the silencer cotton 31 move from the first state to the second state, the support plate 5 and the silencer cotton 31 are The sound cotton 31 moves and rotates toward the center of the silencer channel 4, and the rotation direction is to the other side of the passive groove 26, that is, to the side away from the connection between the elastic rope 61 and the fixed plate 23. Therefore, during the movement of the support plate 5, the elastic rope 61 is stretched. Due to the rotation of the support plate 5, the length direction of the elastic rope 61 is pulled and tilted from the initial radial direction consistent with the silencer tube 1. At this time, the elastic rope 61 will give the sealing plate 62 an elastic force opposite to the rotation direction of the support plate 5, and pull the sealing plate 62 to rotate to the side opposite to the rotation direction of the support plate 5, so that the sealing plate 62 is tightly attached to the side of the support plate 5 opposite to the rotation direction and adjacent to the sound-absorbing cotton 31. Therefore, during the continuous rotation of the support plate 5 and the silencer 3, the elastic rope 61 is continuously stretched, and the sealing plate 62 will gradually be squeezed on the sound-absorbing cotton 31 as the elastic rope 61 is stretched, and the gap between the support plate 5 and the adjacent sound-absorbing cotton 31 is sealed.

[0050] Furthermore, a rubber pad is installed on a side of the sealing plate 62 away from the supporting plate 5 .

[0051] Specifically, the rubber pad is fixed to the surface of the sealing plate 62. When the sealing plate 62 seals the gap, the sealing plate 62 contacts the adjacent silencer cotton 31 through the rubber bottom. Under the spacing of the rubber pad, the sealing plate 62 can avoid damaging the silencer cotton 31 in the process of squeezing the silencer cotton 31. Secondly, the deformation of the rubber pad can also provide a sealing effect on the gap.

[0052] In another embodiment of the present invention, an adjusting member 7 is installed on the fixing plate 23 , and the adjusting member 7 is used to adjust the elastic force applied by the elastic member to the sealing plate 62 .

[0053] Specifically, in the above-mentioned embodiment, the support plate 5 and the sound-absorbing cotton 31 have only one second state, that is, after the sealing plate 62 seals the gap between the support plate 5 and the adjacent sound-absorbing cotton 31, the support plate 5 and the sound-absorbing cotton 31 can no longer move in the second state. In the use process of the existing fan, multiple power adjustments are performed, that is, the fan has multiple gears. When the support plate 5 and the sound-absorbing cotton 31 are adjusted to the second state at a single time, it is not suitable for the use of a multi-gear fan. Therefore, in this embodiment, an adjusting member 7 is provided, and the adjusting member 7 is used to adjust the elastic force applied by the elastic member to the sealing plate 62. The elastic member is an elastic rope 61, one end of which is movably connected to the fixed disk 23. The adjusting member 7 can be a linear drive mechanism 2 such as a cylinder or an electric telescopic rod. When the adjusting member 7 is a cylinder, the cylinder is fixed to the fixed disk 23, and one end of the elastic rope 61 is connected to the output shaft of the cylinder. In actual use, when the fan is adjusted once, the support plate 5 and the silencer cotton 31 are adjusted from the first state to the second state according to the above steps, and the positions of the support plate 5 and the silencer cotton 31 after the adjustment are recorded as the second state A. At this time, the sealing member 6 has sealed the gap between the support plate 5 and the adjacent silencer cotton 31. The elastic rope 61 is in a stretched and taut state. Under the blocking of the seal 6, the support plate 5 can no longer move or rotate. Subsequently, the cylinder output shaft is stretched to contact the elastic rope 61, and the elastic rope 61 is in a taut state. After the sealing plate 62 loses the elastic force provided by the elastic rope 61, the torsion spring begins to reset and drives the sealing plate 62 to rotate in the opposite direction and fits against the surface of the support plate 5 again. The reset rotation of the sealing plate 62 opens the gap. After the gap is opened, the support plate 5 can continue to move into the silencer channel 4, so that the support plate 5 and the silencer cotton 31 can move to the second state B and the first state C. The positions of the second state C and the second state D, different second states have different amplitudes of movement and rotation into the silencer channel 4, and the corresponding adjusted sizes of the silencer channel 4 and the lengths of the sound waves penetrating the silencer cotton 31 are also different. Therefore, when the fan is subsequently adjusted for the second, third or even fourth time, the support plate 5 and the silencer cotton 31 can still be adaptively adjusted according to the multiple adjustments of the fan, so that different gears of the fan correspond to different sizes of the silencer channel 4 and the lengths of the sound waves penetrating the silencer cotton 31, that is, the silencer tube 1 can adjust the adaptive silencer volume according to the different power and gears of the fan.

[0054] In an optional embodiment, preferably, the movable part includes multiple groups of electromagnetic blocks 71 and limit blocks 72, and a limit groove 27 is also provided on the surface of the fixed disk 23. The limit groove 27 is located on one side of the passive groove 26, and the groove direction of the limit groove 27 is consistent with the groove direction of the passive groove 26. The electromagnetic block 71 is arranged on one side wall of the limit groove 27, and one end of the elastic part is connected to the limit block 72. The limit block 72 is arranged in the limit groove 27 and forms a sliding guide with the limit groove 27, and the limit block 72 is magnetically connected to the electromagnetic block 71.

[0055] Specifically, the limit groove 27 is located on one side of the passive groove 26, and the groove direction of the limit groove 27 is consistent with the groove direction of the passive groove 26. The electromagnetic block 71 is arranged on one side wall of the limit groove 27. Multiple groups of electromagnetic blocks 71 are equidistantly distributed along the groove direction of the limit groove 27. The limit block 72 is made of metal, and one end of the elastic rope 61 is connected to the limit block 72. In actual use, the multiple groups of electromagnetic blocks 71 correspond to multiple gears of the fan, that is, multiple power conditions. In the first state, the electromagnetic block 71 at one end of the limit groove 27 away from the silencer channel 4 is energized to attract and limit the limit block 72 at one end of the limit groove 27. When the fan After a power adjustment, i.e., gear adjustment, the support plate 5 and the silencer cotton 31 are adjusted from the first state to the second state according to the above steps. At this time, it is the second state A, and the elastic rope 61 is stretched to be in a taut state. When the fan continues to adjust the power, i.e., gear, in order to adaptably adjust the silencer volume, the electromagnetic block 71 at one end of the limit slot 27 is closed, and another set of electromagnetic blocks 71 adjacent to the electromagnetic block 71 near the silencer channel 4 is connected. At this time, after the limit block 72 loses the electromagnetic block 71 at one end of the limit slot 27, the torsion spring at the rotation connection between the sealing plate 62 and the support plate 5 is reset, and the torsion spring resets to drive the sealing When the plate 62 is reset and rotated, the elastic force of the torsion spring and the elastic rope 61 is used to pull the limit block 72 to slide in the limit groove 27. When it slides to the magnetic attraction range of another adjacent group of electromagnetic blocks 71 that have been powered on, the limit block 72 is attracted and limited by the electromagnetic block 71, and the elastic rope 61 is in a relaxed state. The sealing plate 62 opens the gap between the support plate 5 and the adjacent silencer cotton 31 again. When the support plate 5 and the silencer cotton 31 need to move from the second state A to the second state B, due to the re-limitation of the limit block 72, that is, one end of the elastic rope 61 is fixed on the fixed disk 23 again, so When the second state A moves to the second state B, the sealing plate 62 will rotate again and seal the gap between the support plate 5 and the adjacent silencer cotton 31. By repeating the above steps, the support plate 5 and the silencer cotton 31 can be adjusted to the second state C and the second state D, so that different gears of the fan can obtain different adjustments of the support plate 5 and the silencer cotton 31, that is, the second state A, the second state B, the second state C and the second state D. The size of the silencer channel 4 in each second state and the length of the sound wave penetrating the silencer cotton 31 are different, that is, the amount of silencing is different, so as to adapt to different powers and gears of the fan.

[0056] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An adjustable muffler, characterized in that: It comprises a silencer (1), a driving mechanism (2) installed in the silencer (1), and a plurality of silencer components (3); a silencer channel (4) is formed between the plurality of silencer components (3); the driving mechanism (2) is used to drive the plurality of silencer components (3) to move toward the center of the silencer channel (4); The silencer (3) is made of a flexible material; A support plate (5) is installed in the silencer (1), the support plate (5) is movably installed in the silencer (1), the silencer (3) is installed on the surface of the support plate (5), and the driving mechanism (2) is connected to the support plate (5); The support plate (5) is capable of rotating inside the silencer (1); The driving mechanism (2) comprises a driving motor (21), a fixed disk (23) and a rotating disk (24); the fixed disk (23) and the rotating disk (24) are respectively located at two end openings of the silencer (1); the fixed disk (23) is fixedly connected to the inside of the silencer (1); the rotating disk (24) is rotatably connected to the inner wall of the silencer (1); the supporting plate (5) and the silencer (3) are both located between the fixed disk (23) and the rotating disk (24); a gear ring (28) is installed on the outer wall of the rotating disk (24); the driving motor (21) is fixedly connected to the silencer The inner wall of the cylinder (1) is provided with a gear (22) on the output shaft of the driving motor (21), the gear (22) meshes with the gear ring (28), the rotating disk (24) is provided with a guide groove (25), the fixed disk (23) is provided with a passive groove (26), both ends of the support plate (5) are provided with sliders (51), the two groups of sliders (51) are located in the guide groove (25) and the passive groove (26), and form a sliding guide fit with the guide groove (25) and the passive groove (26), and the silencer (3) is provided with a guide inclined surface; The combination of the support plate (5) and the silencer (3) is in the shape of an arrow; A plurality of the silencers (3) are circularly arranged around the silencer tube (1); A sealing member (6) is also installed in the silencer cylinder (1), and the sealing member (6) is used to seal the gap between the support plate (5) and the adjacent silencer (3); The sealing member (6) comprises a sealing plate (62) and an elastic member. The sealing plate (62) is rotatably mounted on a side of the support plate (5) away from the silencer (3). Two ends of the elastic member are respectively connected to the fixing plate (23) and the sealing plate (62).

2. An adjustable muffler according to claim 1, characterized in that: A rubber pad is installed on a side of the sealing plate (62) away from the supporting plate (5).

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