Noise reduction device for air inlet of fan

Abstract

The embodiment of the invention provides a fan air inlet noise reduction device, and relates to the technical field of fan noise reduction. The fan air inlet noise reduction device comprises a bottom frame, the top of the bottom frame is fixedly connected with an outer cover cylinder, and an inner cover cylinder is embedded in an inner cavity of the outer cover cylinder; the front face of the outer cover barrel communicates with an air inlet frame communicating and matched with the inner cover barrel, the top, close to the outer cover barrel, of the bottom frame is fixedly connected with a piston cylinder, side barrels are fixedly connected to the two sides of the outer cover barrel correspondingly, and reciprocating assemblies and flow equalizing assemblies matched with the air inlet frame for use are arranged on the side barrels correspondingly. The piston cylinder is provided with an air supply assembly and a flow dividing assembly which are used in cooperation with the outer cover barrel and the inner cover barrel. A reciprocating telescopic mode is adopted, pressure releasing, buffering and flow equalizing effects are achieved on the air inlet volume and air pressure of the air inlet of the fan, the air inlet volume and air pressure of the air inlet of the fan are prevented from being too large, meanwhile, additional air inlet supply can be provided for the fan, the defect that the air inlet volume of a single air inlet is insufficient is overcome, and noise caused by wind turbulence is prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of fan noise reduction, and in particular relates to a fan air inlet noise reduction device. Background Art

[0002] A fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine. Fan is China's customary abbreviation for gas compression and gas delivery machinery. Commonly referred to fans include ventilators, blowers, wind turbines, and fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, ventilation and air induction of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selection of grains, wind tunnel wind sources and inflation and propulsion of hovercraft, etc.

[0003] In the prior art (the patent application with publication number CN112096663A and patent name of noise reduction device for fan air inlet), an air inlet area is formed by the peripheral side of the escutcheon, an air outlet area is formed at one end of the escutcheon, and a cover plate is provided at the end of the escutcheon away from the air outlet area, a sound-absorbing layer is provided in the area formed by the cover plate and the escutcheon, and a connecting mechanism is provided on the escutcheon, which has the effect of improving the noise reduction performance of the centrifugal fan. In the process of implementing the technical solution, it is found that there are at least the following problems in the prior art.

[0004] During the operation of the fan, when the wind intake at the fan inlet is insufficient, turbulence is likely to occur in the fan inlet and cause noise. At the same time, if the air intake volume and pressure are too large or too small, and there is no buffering and pressure relief function, the fan inlet noise will also be too loud. Therefore, the noise at the fan inlet cannot be effectively reduced by simple silencing means alone. Summary of the invention

[0005] The present application aims to at least solve one of the technical problems in the prior art that the reciprocating telescopic method cannot be used to achieve the pressure relief buffering and equalizing flow effect on the air volume and pressure of the fan inlet, resulting in excessive air volume and pressure at the fan inlet, and at the same time, the fan cannot be provided with additional air supply, resulting in insufficient air volume at the fan inlet, turbulence, and noise. To this end, the present application proposes a fan inlet noise reduction device.

[0006] To achieve the above purpose, the specific technical solutions of the present invention are as follows:

[0007] The fan air inlet noise reduction device comprises a base frame, the top of which is fixedly connected with an outer cover tube, the inner cavity of which is embedded with an inner cover tube, and the top of which is connected with an exhaust frame connected with the inner cover tube;

[0008] The front of the outer cover tube is connected to an air inlet frame that is connected and matched with the inner cover tube, and the bottom frame is fixedly connected to a piston cylinder near the top of the outer cover tube. Both sides of the outer cover tube are fixedly connected to side tubes, and the side tubes are respectively provided with a reciprocating component and a flow balancing component used in conjunction with the air inlet frame;

[0009] The piston cylinder is respectively provided with an air supply component and a flow distribution component used in conjunction with the outer cover cylinder and the inner cover cylinder.

[0010] Preferably: the reciprocating assembly includes a double-headed motor fixed between the outer cover tube and the piston cylinder, and a main synchronous wheel is fixedly connected to an output shaft of the double-headed motor, the outer side of the main synchronous wheel is connected to a slave synchronous wheel that rotates with the side tube through a synchronous belt drive, and a rotating rod is fixedly connected to the front of the slave synchronous wheel, and a reciprocating screw that rotates with the side tube is fixedly connected to the front of the rotating rod, and a screw sleeve is threadedly connected to the reciprocating screw.

[0011] Preferably: the flow balancing component includes a connecting piece fixed on the inner side of the screw sleeve, and the inner side of the connecting piece is fixedly connected to a main air inlet hood, the rear end of the main air inlet hood is connected to a telescopic tube that is connected and coordinated with the air inlet frame, and a flow balancing hood is embedded in the inner cavity of the main air inlet hood, and flow balancing holes are opened around the front side of the flow balancing hood, and buffer holes used in conjunction with the flow balancing holes are opened around the back side of the flow balancing hood.

[0012] Preferably: the air supply assembly includes a cam fixed to the other end of the double-headed motor, and the other end of the cam is rotatably connected to a connecting rod, the top of the connecting rod is hinged with a piston that slides with the piston cylinder, and the top of the piston cylinder is connected to a three-way valve, the air inlet of the three-way valve is connected to an auxiliary air inlet hood, and an electric control valve is provided on the auxiliary air inlet hood, and the exhaust port of the three-way valve is connected to an exhaust main pipe.

[0013] Preferably: the diverter assembly includes a diverter head connected to the bottom end of the exhaust main pipe and fixedly connected to the piston cylinder, and the inner cavity of the diverter head is rotatably connected to a diverter fan, the diverter head is connected on all sides with exhaust branch pipes used in conjunction with the diverter fan, and the other end of the exhaust branch pipe is connected with an exhaust hood embedded in and matched with the outer cover tube and the inner cover tube, and the inner cavities of the exhaust hood, the outer cover tube and the inner cover tube are respectively embedded with a primary flow equalizing plate and a secondary flow equalizing plate.

[0014] Preferably, a sliding groove slidably matched with the connecting piece is provided on the inner side of the side tube, and a polished rod is fixedly connected to the four sides of the main air inlet cover, and the other end of the polished rod is slidably connected to a sliding sleeve fixedly matched with the air inlet frame.

[0015] Preferably, the outer surface of the polished rod is sleeved with a buffer spring fixedly matched with the sliding sleeve, and a large air inlet flow equalizing net is embedded between the telescopic tube and the air inlet frame, and a buffer cavity for wind force buffering with the buffer dense holes is reserved between the flow equalizing cover and the main air inlet cover.

[0016] Preferably: the flow balancing cover adopts a concave hollow structure design, and a large-diameter opening area is opened at one end of the flow balancing cover close to the telescopic tube, and the corners of the large-diameter opening area are designed with arc chamfers, and the mesh density of the flow balancing dense holes is greater than the mesh density of the buffer dense holes.

[0017] Preferably: a small air inlet equalizing net is embedded in the inner cavity of the auxiliary air inlet hood, and a diverter valve is provided on the exhaust main pipe, a wind pressure sensor is embedded in the diverter valve, and a pressure gauge is embedded in the three-way valve.

[0018] Preferably, the exhaust frame adopts an arc-shaped curved structure design, and the diameter of the exhaust frame gradually increases outwards with the outer cover tube as the starting point, and an exhaust flow equalizing net is embedded at one end of the exhaust frame away from the outer cover tube.

[0019] The fan air inlet noise reduction device of the present invention has the following advantages:

[0020] 1. The fan inlet noise reduction device, during the noise reduction of the fan inlet, first provides a unified driving source by a double-headed motor, saving the power drive cost, and cooperates with the synchronous transmission of the main synchronous wheel and the two sets of slave synchronous wheels, and then the reciprocating screws on the two rotating rods realize the horizontal reciprocating displacement effect of the two sets of screw sleeves. The two sets of screw sleeves drive the equalizing cover in the main air inlet cover to move back and forth horizontally through the two sets of connecting parts, and the telescopic channel between the main air inlet cover and the air inlet frame is built by the telescopic tube. Through the equalizing and buffering cooperation of the equalizing dense holes and the buffer dense holes, the equalizing cover that moves back and forth horizontally performs equalizing and pressure relief processing on the incoming air volume and pressure, so as to avoid excessive wind pressure and turbulence in the air inlet frame causing noise, thereby playing an effective noise reduction role.

[0021] 2. The fan inlet noise reduction device, at the same time, first provides wind supply to the piston cylinder by the auxiliary air inlet cover, and the double-headed motor providing a unified driving source drives the piston on the connecting rod to perform reciprocating work in the piston cylinder through the cam, generating wind force in the piston cylinder, and then the three-way valve and the exhaust main pipe transmit the generated wind force to provide additional air supply for the fan, increase the air intake of the fan, so as to avoid noise caused by insufficient air intake of the fan.

[0022] 3. The fan inlet noise reduction device, the wind in the exhaust main pipe is pre-disturbed and pressure-released by the diverter fan in the diverter head, and then diverted by the exhaust hoods on the three exhaust branch pipes. The first-level equalizing plate and the second-level equalizing plate gradually equalize the supplied wind pressure and release it, and then uniformly supply it to the outer cover tube and the inner cover tube with a double silent design, so as to further reduce the noise of the fan inlet to avoid noise pollution to the work site. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of the fan air inlet noise reduction device of the present invention;

[0025] Figure 2 It is a rear view of the structure of the fan air inlet noise reduction device of the present invention;

[0026] Figure 3 It is a front cross-sectional view of the structure of the fan air inlet noise reduction device of the present invention;

[0027] Figure 4 It is a rear cross-sectional view of the structure of the fan air inlet noise reduction device of the present invention;

[0028] Figure 5 This is an internal view of the structure of the fan air inlet noise reduction device of the present invention;

[0029] Figure 6 It is a bottom view of the reciprocating component and the flow balancing component structure of the present invention;

[0030] Figure 7 It is a top view of the reciprocating component and the flow balancing component structure of the present invention;

[0031] Figure 8 It is a partial side view of the reciprocating component and the flow balancing component structure of the present invention;

[0032] Fig. 9 It is a bottom-up cross-sectional view of the current balancing component structure of the present invention;

[0033] Fig.10 It is a bottom-up cross-sectional view of the flow balancing cover structure of the present invention;

[0034] Fig.11 It is a rear cross-sectional view of the piston cylinder, air supply assembly and flow distribution assembly structure of the present invention;

[0035] Fig.12 It is a front view of the air supply component and the flow distribution component structure of the present invention;

[0036] Fig.13 It is a bottom-up exploded view of the air supply component and the flow diversion component structure of the present invention;

[0037] Fig.14 It is a partial rear cross-sectional view of the diversion assembly structure of the present invention;

[0038] Fig.15It is an exploded view of the outer cover tube and the inner cover tube structure of the present invention;

[0039] Fig.16 It is a front cross-sectional view of the flow guide frame and the flow stabilizing assembly structure of the present invention;

[0040] Fig.17 It is a side exploded view of the flow stabilizing assembly structure of the present invention;

[0041] Fig.18 It is an exploded view of the air inlet frame, the guide frame and the air inlet tube structure of the present invention;

[0042] Fig.19 It is a partial side view of the structure of the fan air inlet noise reduction device of the present invention.

[0043] Explanation of the markings in the figure: 1. Base frame; 2. Outer cover cylinder; 3. Inner cover cylinder; 4. Exhaust frame; 5. Inlet frame; 6. Piston cylinder; 7. Side cylinder; 8. Reciprocating assembly; 81. Double-head motor; 82. Main synchronous wheel; 83. Slave synchronous wheel; 84. Rotating rod; 85. Reciprocating screw rod; 86. Screw rod sleeve; 9. Flow equalizing assembly; 91. Connecting piece; 92. Main air inlet cover; 93. Telescopic tube; 94. Flow equalizing cover; 95. Flow equalizing dense hole; 96. Buffer dense hole; 10. Air supply assembly; 101. Cam; 102. Connecting rod; 103. Piston; 104. Three-way valve; 105. Auxiliary air inlet cover; 106. Exhaust main pipe; 11. Flow diversion assembly; 111. Flow diversion head; 112. Flow diversion fan; 113. Exhaust branch pipe; 114. Exhaust hood; 115. Primary flow equalizing plate; 116. Secondary flow equalizing plate; 12. Flow guide seat; 13. Flow guide frame; 14. Air inlet tube; 15. Flow stabilizing assembly; 151. Silent impeller; 152. Main bevel gear; 153. Slave bevel gear; 154. Silent exhaust fan; 155. Curved flow equalizing net; 156. Flow stabilizing net; 16. Slide; 17. Bare rod; 18. Sleeve; 19. Buffer spring; 20. Large air inlet flow equalizing net; 21. Small air inlet flow equalizing net; 22. Flow diversion valve; 23. Exhaust air flow equalizing net. DETAILED DESCRIPTION

[0044] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0045] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying 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 embodiments of the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0047] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0048] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0049] like Figure 1-Figure 19 As shown, the fan air inlet noise reduction device of the present invention comprises a base frame 1, an outer cover tube 2 is fixedly connected to the top of the base frame 1, and an inner cover tube 3 is embedded in the inner cavity of the outer cover tube 2, and the top of the outer cover tube 2 is connected to an exhaust rack 4 connected and matched with the inner cover tube 3, and the exhaust rack 4 adopts an arc-shaped curved structure design, which is conducive to the diversion and discharge of wind force, and the diameter of the exhaust rack 4 is gradually increased outward with the outer cover tube 2 as the initial point, so as to improve the smoothness of wind discharge, so as to avoid turbulent blockage in the exhaust rack 4 when the wind is discharged, and an exhaust flow equalizing net 23 is embedded at one end of the exhaust rack 4 away from the outer cover tube 2, which performs flow equalization on the wind discharged by the exhaust rack 4, thereby reducing the noise when the wind is discharged from the exhaust rack 4;

[0050] The front of the outer cover tube 2 is connected to an air inlet frame 5 which is connected and cooperated with the inner cover tube 3, and the base frame 1 is fixedly connected to a piston cylinder 6 near the top of the outer cover tube 2, and side tubes 7 are fixedly connected on both sides of the outer cover tube 2, and the side tubes 7 are respectively provided with a reciprocating component 8 and a flow equalizing component 9 used in conjunction with the air inlet frame 5, and the piston cylinder 6 is respectively provided with an air supply component 10 and a flow diversion component 11 used in conjunction with the outer cover tube 2 and the inner cover tube 3. A reciprocating and telescopic method is adopted to achieve a pressure relief, buffering and flow equalization effect on the air volume and air pressure of the fan inlet, so as to prevent the air volume and air pressure at the fan inlet from being too large. At the same time, it can also provide another air supply to the fan to make up for the insufficient air volume of a single air inlet, so as to prevent wind turbulence from causing noise.

[0051] like Figure 6-Figure 15 As shown, the reciprocating assembly 8 includes a double-headed motor 81 fixed between the outer cover tube 2 and the piston cylinder 6. The double-headed motor 81 first provides a unified driving source to save power driving costs, and a main synchronous wheel 82 is fixedly connected to an output shaft of the double-headed motor 81. The outer side of the main synchronous wheel 82 is connected to a slave synchronous wheel 83 that rotates with the side tube 7 through a synchronous belt transmission, and the main synchronous wheel 82 and the two groups of slave synchronous wheels 83 are synchronously driven, and a rotating rod 84 is fixedly connected to the front of the slave synchronous wheel 83. A reciprocating screw 85 that rotates with the side tube 7 is fixedly connected to the front of the rotating rod 84, and a screw sleeve 86 is threadedly connected to the reciprocating screw 85. The reciprocating screw 85 on the two rotating rods 84 realizes a horizontal reciprocating displacement effect on the two groups of screw sleeves 86.

[0052] The flow balancing component 9 includes a connecting piece 91 fixed to the inner side of the screw sleeve 86, and the inner side of the connecting piece 91 is fixedly connected to the main air inlet cover 92, the rear end of the main air inlet cover 92 is connected to a telescopic tube 93 that is connected and matched with the air inlet frame 5, and the inner cavity of the main air inlet cover 92 is embedded with a flow balancing cover 94, and the telescopic channel between the main air inlet cover 92 and the air inlet frame 5 is built by the telescopic tube 93. The two sets of screw sleeves 86 drive the flow balancing cover 94 in the main air inlet cover 92 through the two sets of connecting pieces 91. Moving back and forth horizontally, the front of the equalizer cover 94 is provided with equalizer holes 95 all around, and the back of the equalizer cover 94 is provided with buffer holes 96 used in conjunction with the equalizer holes 95 all around. Through the equalizer holes 95 and the buffer holes 96, the equalizer cover 94 moving back and forth horizontally performs equalizer pressure relief on the incoming air volume and pressure, so as to prevent the wind from causing excessive pressure and turbulence in the air inlet frame 5 and causing noise, thereby playing an effective noise reduction role;

[0053] A slide groove 16 that is slidably matched with the connecting piece 91 is provided on the inner side of the side tube 7, and a polished rod 17 is fixedly connected to the four sides of the main air inlet cover 92. The other end of the polished rod 17 is slidably connected to a sliding sleeve 18 that is fixedly matched with the air inlet frame 5. The outer surface of the polished rod 17 is sleeved with a buffer spring 19 that is fixedly matched with the sliding sleeve 18, which plays a role of sliding support and elastic buffering for the air inlet frame 5, thereby improving the stability of the horizontal reciprocating movement of the air inlet frame 5.

[0054] A large air inlet equalizing net 20 is embedded between the telescopic tube 93 and the air inlet frame 5 to equalize the wind entering the air inlet frame 5 and reduce the noise during air intake. A buffer cavity is left between the equalizing cover 94 and the main air inlet cover 92 to buffer the wind with the buffer holes 96, providing a buffer space for the wind passing through the equalizing cover 94 to prevent wind turbulence from causing noise. The equalizing cover 94 adopts a concave hollow structure design to prevent wind turbulence in the equalizing cover 94, and a large-diameter opening area is opened at one end of the equalizing cover 94 close to the telescopic tube 93, which is conducive to the discharge of wind from the equalizing cover 94, and the corners of the large-diameter opening area are designed with arc chamfers. The mesh density of the equalizing holes 95 is greater than the mesh density of the buffer holes 96, so that the wind passing through the equalizing cover 94 can achieve a double equalization and pressure relief effect of different apertures.

[0055] The air supply assembly 10 includes a cam 101 fixed to the other end of the double-headed motor 81, and the other end of the cam 101 is rotatably connected to a connecting rod 102, the top of the connecting rod 102 is hinged with a piston 103 that slides with the piston cylinder 6, and the top of the piston cylinder 6 is connected to a three-way valve 104, and the air inlet of the three-way valve 104 is connected to an auxiliary air inlet cover 105, which first provides wind power to the piston cylinder 6, and the auxiliary air inlet cover 105 is provided with The exhaust port of the electric control valve and the three-way valve 104 is connected to the exhaust main pipe 106, and the double-headed motor 81 providing a unified driving source drives the piston 103 on the connecting rod 102 to perform reciprocating work in the piston cylinder 6 through the cam 101, generating wind force in the piston cylinder 6, and then the three-way valve 104 and the exhaust main pipe 106 transmit the generated wind force to provide additional air supply for the fan, increase the air intake of the fan, so as to avoid noise caused by insufficient air intake of the fan;

[0056] A small air inlet equalizing net 21 is embedded in the inner cavity of the auxiliary air inlet hood 105 to equalize the wind force sucked into the auxiliary air inlet hood 105, and a diverter valve 22 is provided on the exhaust main pipe 106 to evenly distribute the wind force flowing through the exhaust main pipe 106. A wind pressure sensor is embedded in the diverter valve 22 to monitor the wind pressure flowing through the diverter valve 22, and a pressure gauge is embedded in the three-way valve 104 to display the wind pressure sucked in and discharged through the three-way valve 104.

[0057] The flow dividing assembly 11 includes a flow dividing head 111 connected to the bottom end of the exhaust main pipe 106 and fixedly connected to the piston cylinder 6, and the inner cavity of the flow dividing head 111 is rotatably connected to a flow dividing fan 112, and the wind in the exhaust main pipe 106 is pre-disturbed and depressurized by the flow dividing fan 112 in the flow dividing head 111, and the flow dividing head 111 is connected to an exhaust branch pipe 113 used in conjunction with the flow dividing fan 112 on all sides, and the other end of the exhaust branch pipe 113 is connected to an exhaust fan 113 embedded in the outer cover tube 2 and the inner cover tube 3. The hood 114, the inner cavities of the exhaust hood 114, the outer hood tube 2 and the inner hood tube 3 are respectively embedded with a primary flow equalizing plate 115 and a secondary flow equalizing plate 116, which are then diverted by the exhaust hood 114 on the three exhaust branch pipes 113, and the wind pressure is uniformly supplied to the outer hood tube 2 and the inner hood tube 3 with a double silent design after being equalized and released step by step by the primary flow equalizing plate 115 and the secondary flow equalizing plate 116, so as to further reduce the noise of the fan air inlet to avoid noise pollution to the work site.

[0058] like Figure 16-18 As shown, during the noise reduction of the fan air inlet, most fans have only one air inlet, and the wind force at the air inlet is easily gathered and disordered at the air inlet of a single fan, which is easy to cause noise, and does not have the flow stabilization function of multiple air inlets. The inner cavity of the air inlet frame 5 is fixedly connected with a guide seat 12 on all sides, which is conducive to the diversion of the wind force supplied to the air inlet frame 5, and the inner side of the guide seat 12 is fixedly connected with a guide frame 13 used in conjunction with a large air inlet flow equalizing net 20, which is used to release pressure and divert the wind after the flow equalization treatment of the large air inlet flow equalizing net 20. The air inlet frame 5 is connected with an air inlet tube 14 on all sides, so that the fan has a multi-air inlet function to avoid excessive wind pressure caused by a single air inlet and cause noise.

[0059] The guide frame 13 is provided with a flow stabilizing component 15 used in conjunction with the air inlet tube 14, and the flow stabilizing component 15 includes a silent impeller 151 fixed on the output shaft of the double-headed motor 81 close to the main synchronous wheel 82, which performs rotational turbulence treatment on the incoming wind force supplied by the air inlet frame 5 to the inner cover tube 3, so that the incoming wind force is evenly and stably discharged from the exhaust frame 4 on the outer cover tube 2, and the front of the silent impeller 151 is fixedly connected to a main bevel gear 152 that rotates with the guide frame 13, and the main bevel gear 152 is meshed with a slave bevel gear 153 that rotates with the guide frame 13 on all sides, and the outer side of the slave bevel gear 153 is fixedly connected to The silent exhaust fan 154 used in conjunction with the air inlet duct 14 is driven by the main bevel gear 152 to rotate synchronously with the three groups of silent exhaust fans 154 on the slave bevel gears 153, and the incoming wind force supplied through the three groups of air inlets 14 is evenly pressure-released and flow-stabilized to prevent the incoming wind force from generating turbulent noise at the air inlet duct 14, and a curved flow-balancing net 155 is embedded between the air inlet duct 14 and the air inlet frame 5 to rotate with the silent exhaust fan 154, and a flow-stabilizing net 156 is embedded on the outer side of the air inlet duct 14 to stabilize the wind force entering the air inlet duct 14, and the noise at the fan air inlet is further reduced by adopting the means of increasing the air inlet.

[0060] Working principle of the fan air inlet noise reduction device: first, the double-headed motor 81 is controlled to start and drive the main synchronous wheel 82, the cam 101 and the silent impeller 151 to rotate synchronously. The silent rotating silent impeller 151 blows the outside air into the outer cover tube 2 and the inner cover tube 3 with double silent design, and the outside air flow is pre-supplied into the air inlet frame 5 by the main air inlet cover 92 and the three sets of air inlet tubes 14. At the same time, the silent rotating silent impeller 151 drives the main bevel gear 152 to rotate synchronously. 52 drives three groups of silent exhaust fans 154 on the bevel gears 153 to rotate in the three groups of air inlet tubes 14, and three groups of curved surface flow balancing nets 155 and flow stabilizing nets 156 perform double flow stabilization on the airflow entering the air inlet frame 5 from the air inlet tube 14, and three groups of silent exhaust fans 154 perform pressure release and turbulence on the airflow entering the air inlet frame 5 from the air inlet tube 14, and then the airflow entering the air inlet frame 5 is uniformly blown into the inner cover tube 3 by the silent impeller 151 in turn through the guide seat 12 and the guide frame 13;

[0061] At the same time, the main synchronous wheel 82 drives the two sets of rotating rods 84 on the synchronous wheel 83 to rotate synchronously through the synchronous belt, and the two rotating rods 84 drive the screw sleeves 86 on the two reciprocating screws 85 to move back and forth horizontally, and the two sets of screw sleeves 86 drive the two sets of connecting parts 91 to slide back and forth horizontally in the slide groove 16. The smooth rod 17, the sliding sleeve 18 and the buffer spring 19 play a sliding buffer role on the flow balancing cover 94 in the main air inlet cover 92. Under the cooperation, the two sets of connecting parts 91 drive the main air inlet cover 92 to move back and forth horizontally. The flow balancing cover 94 in the cover 92 moves horizontally back and forth, and drives the telescopic tube 93 to perform a reciprocating telescopic action. The flow balancing holes 95 and the buffer holes 96 arranged inside and outside the flow balancing cover 94 that reciprocates and telescopes perform a double flow balancing buffering treatment on the incoming airflow. The airflow after the double flow balancing buffering treatment passes through the large air inlet flow balancing net 20 at the end of the telescopic tube 93 for another flow balancing treatment and is supplied to the air inlet frame 5. Then, it passes through the air inlet frame 5 and is evenly blown into the inner cover tube 3 by the silent impeller 151.

[0062] At the same time, the other output shaft of the double-headed motor 81 drives the piston 103 on the connecting rod 102 to reciprocate in the piston cylinder 6 through the cam 101. When the piston 103 is in the return air intake state in the piston cylinder 6, the air intake passage on the three-way valve 104 and the auxiliary air intake cover 105 is controlled to be opened, and the diverter valve 22 on the exhaust main pipe 106 is closed. Then, the outside air is supplied to the piston cylinder 6 after being processed by the small air intake flow equalization net 21 on the auxiliary air intake cover 105. When the piston 103 is in the process exhaust state in the piston cylinder 6, on the contrary, the air supplied to the piston cylinder 6 is supplied by the active exhaust. The air is discharged into the exhaust main pipe 106 through the plug 103, and then diverted by the diverter valve 22 and supplied to the diverter head 111. Under the pressure of the air flow, the diverter fan 112 is forced to rotate and release the pressure of the supplied wind. After the exhaust hood 114 on the three exhaust branch pipes 113 passes through the primary flow equalizing plate 115 and the secondary flow equalizing plate 116 for double flow equalization and pressure relief, it is evenly blown into the inner cover tube 3 by the silent impeller 151. Finally, the wind force that enters the inner cover tube 3 is uniformly discharged through the exhaust equalizing net 23 by the exhaust rack 4 on the outer cover tube 2 under the action of the silent rotation force of the silent impeller 151.

[0063] It should be noted that the specific model and specifications of the double-headed motor 81 need to be selected and determined based on the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field, so it will not be repeated in detail.

[0064] The power supply circuits of the double-headed motor 81 and various valves are clear to those skilled in the art and will not be described in detail here.

[0065] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A fan inlet noise reduction device, comprising a base frame (1), characterized in that: The top of the base frame (1) is fixedly connected to an outer cover tube (2), and the inner cavity of the outer cover tube (2) is embedded with an inner cover tube (3), and the top of the outer cover tube (2) is connected to an exhaust frame (4) that is connected and matched with the inner cover tube (3); The front of the outer cover tube (2) is connected to an air inlet frame (5) that is connected and matched with the inner cover tube (3), and the bottom frame (1) is fixedly connected to a piston cylinder (6) near the top of the outer cover tube (2), and both sides of the outer cover tube (2) are fixedly connected to side tubes (7), and the side tubes (7) are respectively provided with a reciprocating component (8) and a flow balancing component (9) used in conjunction with the air inlet frame (5); The piston cylinder (6) is provided with an air supply component (10) and a flow distribution component (11) respectively, which are used in conjunction with the outer cover cylinder (2) and the inner cover cylinder (3).

2. The fan air inlet noise reduction device according to claim 1, characterized in that: The reciprocating assembly (8) comprises a double-headed motor (81) fixed between the outer cover tube (2) and the piston cylinder (6), and a main synchronous wheel (82) is fixedly connected to one output shaft of the double-headed motor (81), and the outer side of the main synchronous wheel (82) is connected to a slave synchronous wheel (83) that rotates with the side tube (7) through a synchronous belt transmission, and the front side of the slave synchronous wheel (83) is fixedly connected to a rotating rod (84), and the front side of the rotating rod (84) is fixedly connected to a reciprocating screw (85) that rotates with the side tube (7), and a screw sleeve (86) is threadedly connected to the reciprocating screw (85).

3. The fan air inlet noise reduction device according to claim 2, characterized in that: The flow equalizing component (9) includes a connecting piece (91) fixed on the inner side of the screw sleeve (86), and the inner side of the connecting piece (91) is fixedly connected to a main air inlet cover (92), the rear end of the main air inlet cover (92) is connected to a telescopic tube (93) connected and matched with the air inlet frame (5), and a flow equalizing cover (94) is embedded in the inner cavity of the main air inlet cover (92), and flow equalizing holes (95) are opened around the front of the flow equalizing cover (94), and buffer holes (96) used in conjunction with the flow equalizing holes (95) are opened around the back of the flow equalizing cover (94).

4. The fan air inlet noise reduction device according to claim 3, characterized in that: The air supply assembly (10) includes a cam (101) fixed to the other end of the double-headed motor (81), and the other end of the cam (101) is rotatably connected to a connecting rod (102), the top of the connecting rod (102) is hinged with a piston (103) that slidably cooperates with a piston cylinder (6), and the top of the piston cylinder (6) is connected to a three-way valve (104), the air inlet of the three-way valve (104) is connected to an auxiliary air inlet hood (105), and an electric control valve is provided on the auxiliary air inlet hood (105), and the air outlet of the three-way valve (104) is connected to an exhaust main pipe (106).

5. The fan air inlet noise reduction device according to claim 4, characterized in that: The flow diversion component (11) comprises a flow diversion head (111) connected to the bottom end of the exhaust main pipe (106) and fixedly connected to the piston cylinder (6), and the inner cavity of the flow diversion head (111) is rotatably connected to a flow diversion fan (112), and the four sides of the flow diversion head (111) are connected to exhaust branch pipes (113) used in conjunction with the flow diversion fan (112), and the other end of the exhaust branch pipe (113) is connected to an exhaust hood (114) embedded in the outer cover tube (2) and the inner cover tube (3), and the inner cavities of the exhaust hood (114), the outer cover tube (2) and the inner cover tube (3) are respectively embedded with a primary flow equalizing plate (115) and a secondary flow equalizing plate (116).

6. The fan air inlet noise reduction device according to claim 5, characterized in that: The inner side of the side tube (7) is provided with a slide groove (16) that slidably cooperates with the connecting piece (91), and the main air inlet cover (92) is fixedly connected with a light rod (17) on all four sides, and the other end of the light rod (17) is slidably connected with a sliding sleeve (18) that is fixedly cooperated with the air inlet frame (5).

7. The fan air inlet noise reduction device according to claim 6, characterized in that: The outer surface of the light rod (17) is sleeved with a buffer spring (19) fixedly matched with the sliding sleeve (18), and a large air inlet flow equalizing net (20) is embedded between the telescopic tube (93) and the air inlet frame (5), and a buffer cavity for wind force buffering with the buffer dense hole (96) is reserved between the flow equalizing cover (94) and the main air inlet cover (92).

8. The fan air inlet noise reduction device according to claim 7, characterized in that: The flow balancing cover (94) adopts a concave hollow structure design, and a large-diameter opening area is opened at one end of the flow balancing cover (94) close to the telescopic tube (93), and the corners of the large-diameter opening area are designed with arc chamfers, and the mesh density of the flow balancing dense holes (95) is greater than the mesh density of the buffer dense holes (96).

9. The fan air inlet noise reduction device according to claim 8, characterized in that: A small air intake equalizing net (21) is embedded in the inner cavity of the auxiliary air intake cover (105), and a diverter valve (22) is provided on the exhaust main pipe (106). A wind pressure sensor is embedded in the diverter valve (22), and a pressure gauge is embedded in the three-way valve (104).

10. The fan air inlet noise reduction device according to claim 9, characterized in that: The exhaust frame (4) adopts an arc-shaped curved structure design, and the diameter of the exhaust frame (4) gradually increases outwards with the outer cover tube (2) as the starting point. An exhaust flow equalization net (23) is embedded at one end of the exhaust frame (4) away from the outer cover tube (2).

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