Silencing box of breathing machine

Abstract

The utility model relates to the technical field of medical instruments, and discloses a respirator silencing box which comprises a silencing box upper cover, a silencing box body, a silencing box lower cover, an air inlet pipe and a gas fairing. The silencing box upper cover, the silencing box main body and the silencing box lower cover are fixedly arranged together; silica gel sealing sheets are arranged among the silencing box upper cover, the silencing box main body and the silencing box lower cover; the air inlet pipe is inserted into the silencing box lower cover; a silencing box air inlet is formed in the air inlet pipe; the gas fairing is inserted into the silencing box upper cover and the silencing box main body; a silencing sponge is adhered to the silencing box upper cover; a supporting frame is fixedly arranged on the inner side of the silencing sponge. A motor vibration reduction silicon rubber case is clamped on the support frame; a motor is arranged in the first motor vibration reduction silicon rubber case. According to the utility model, targeted technical schemes can be provided for high frequency, medium frequency, low frequency, vibration and airflow smoothness of noise respectively, and the vibration and noise of the breathing machine can be effectively reduced in combination with spectral analysis.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, and more specifically to a ventilator silencer box. Background Art

[0002] With the continuous development of medical technology, ventilators have become one of the indispensable and important equipment in modern medicine. In home sleep health, ventilators have a good effect on improving obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD). In medical use, non-invasive ventilators can reduce the respiratory burden of patients with heart failure, reduce the incidence of pulmonary edema, and improve oxygenation and ventilation functions.

[0003] A ventilator is a ventilation therapy device that generally uses the rotation of an electric motor's impeller to deliver airflow. The impeller is the main mechanical component of the power unit and gas delivery. Electrical energy is converted into mechanical energy of the impeller, and the rotating impeller transfers the mechanical energy to the airflow. Ventilators usually use centrifugal motors and axial flow motors.

[0004] However, in actual use, the motor impeller rotates at high speed, and the vibration noise generated by the impeller rotation and the wind noise generated by the impeller cutting the airflow are transmitted to the outside through the connecting air duct. When the noise value and vibration are relatively large, it will seriously affect the user's sleep and comfort.

[0005] In view of this, we propose a ventilator silencer box. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] The purpose of the present application is to provide a ventilator silencer box, which solves the technical problems raised in the above-mentioned background technology and achieves the technical effect of effectively reducing the noise and vibration of the ventilator.

[0008] 2. Technical solution

[0009] The embodiment of the present application provides a ventilator muffler box, including a muffler box upper cover, a muffler box body, a muffler box lower cover, an air intake pipe and a gas fairing;

[0010] The muffler box upper cover, the muffler box main body and the muffler box lower cover are detachably fixed together;

[0011] The upper cover of the muffler box, the main body of the muffler box and the lower cover of the muffler box are all provided with screw fixing holes, and the upper cover of the muffler box, the main body of the muffler box and the lower cover of the muffler box are fixed together through the screw fixing holes and screws.

[0012] A first silicone seal is provided between the upper cover of the muffler box and the main body of the muffler box; a second silicone seal is provided between the main body of the muffler box and the lower cover of the muffler box;

[0013] The air intake pipe is plugged into the lower cover of the muffler box; the air intake pipe is inserted into the lower cover of the muffler box through a slot. The air intake of the muffler box is arranged on the air intake pipe;

[0014] The upper cover of the muffler box and the main body of the muffler box are both provided with card slots;

[0015] The gas fairing is inserted into the slots of the upper cover of the muffler box and the main body of the muffler box. The gas fairing is provided with a muffler box gas outlet;

[0016] The upper cover of the muffler box is provided with a plurality of circuit board fixing screw holes;

[0017] The upper cover of the muffler box is provided with a digital differential pressure sensor sampling port 1, a digital differential pressure sensor sampling port 2 and a pressure sensor sampling port;

[0018] The external circuit board PCBA is fixed on the upper cover of the muffler box through screws and circuit board fixing screw holes.

[0019] The external digital differential pressure sensor can be connected to the digital differential pressure sensor sampling port 1 and the digital differential pressure sensor sampling port 2 by using a silicone tube.

[0020] The external pressure sensor can be connected to the pressure sensor sampling port with a silicone tube.

[0021] A display screen fixing frame is arranged on the upper cover of the muffler box; and the upper part of the external display screen is clamped on the display screen fixing frame.

[0022] Through the above technical solution, the lower cover of the silencer box is integrated into the bottom cover of the ventilator, saving space and making the ventilator smaller. The sampling ports on the digital differential pressure sensor and pressure sensor on the circuit board PCBA are connected to the digital differential pressure sensor sampling port 1 and the digital differential pressure sensor sampling port 2 on the silencer box through the shortest distance of the silicone tube, which is reliable, minimizes gas jitter, and has high sampling accuracy. The display screen is fixed with the help of the silencer box, which is convenient for assembly and saves costs.

[0023] As an optional solution of the utility model, a sound-absorbing sponge is attached to the upper cover of the sound-absorbing box. A support frame is fixedly arranged on the inner side of the sound-absorbing sponge; a motor vibration-absorbing silicone sleeve is clamped on the support frame;

[0024] A motor is arranged in the motor vibration reduction silicone sleeve; a boss is arranged at the air outlet of the motor; and a corresponding position of the motor is placed in the motor vibration reduction silicone sleeve.

[0025] A motor air outlet silicone tube is clamped and arranged on the air outlet boss of the motor.

[0026] A conical boss is arranged on the motor vibration reduction silicone sleeve, and a clamping groove is arranged on the support frame; the conical boss is clamped in the clamping groove of the support frame.

[0027] A groove is arranged on the main body of the muffler box;

[0028] A second sound-absorbing sponge is pasted in the groove of the sound-absorbing box body.

[0029] A spring fixing column is fixedly arranged on the main body of the muffler box; five through grooves are arranged on the muffler sponge; springs are arranged in the through grooves; and the five springs are inserted into the spring fixing column of the main body of the muffler box.

[0030] The first silicone sealing sheet is arranged on the upper plane of the muffler box body.

[0031] A groove is provided on the main body of the muffler box, and a honeycomb sampling tube is inserted in the groove; a protrusion is provided on the honeycomb sampling tube; and an O-type sealing ring groove is provided on the honeycomb sampling tube;

[0032] A sampling tube O-type sealing ring is sleeved in the O-type sealing ring groove of the honeycomb sampling tube.

[0033] The protrusion of the honeycomb sampling tube is inserted into the groove on the main body of the muffler box.

[0034] A sound-absorbing sponge three is pasted on the bottom surface of the lower cover of the sound-absorbing box.

[0035] The lower cover of the muffler box is provided with a groove, in which an air intake pipe is inserted and arranged. The air intake pipe is provided with a protrusion, which is inserted into the groove on the lower cover of the muffler box.

[0036] The silicone seal is placed on the lower plane of the muffler body.

[0037] The gas fairing is provided with screw holes, and a circular baffle is provided on the gas fairing through the screws and the screw holes.

[0038] The gas fairing is provided with an O-ring groove, in which a fairing O-ring is provided; the fairing O-ring is placed in the O-ring groove of the gas fairing 19 .

[0039] Through the above technical solution, the porosity and looseness of the first, second and third silencer sponges are utilized. When sound waves enter the pores, the air and materials in the pores are caused to vibrate slightly. Due to friction and viscous resistance, a considerable part of the sound energy is converted into heat energy and absorbed, thereby reducing high-frequency and medium-frequency noise. The outer cavity is formed by the upper cover of the silencer box, the main body of the silencer box and the lower cover of the silencer box, and the inner cavity is formed by the support frame and the motor vibration reduction silicone sleeve 1. The double-layer structure, the air layer in the double-layer structure can effectively absorb and isolate the energy of the sound waves, thereby reducing the transmission of noise. The silicone material is used for vibration reduction and sealing.

[0040] As an optional solution of the utility model, a conical boss is arranged on the motor vibration reduction silicone sleeve 1. The conical boss is clamped in the clamping groove of the support frame.

[0041] Five springs support the motor's vibration-damping silicone sleeve.

[0042] A corrugated silicone wall 1 is arranged on the silicone tube at the air outlet of the motor, and a corrugated silicone wall 2 is arranged on the first vibration-reducing silicone sleeve of the motor.

[0043] Through the above technical solution, the motor vibration reduction silicone sleeve 1 is supported by a spring. The wire diameter, diameter, length parameters and the number of springs required can be designed according to the selected motor weight and the vibration amplitude during operation. The vibration energy generated by the motor during operation is absorbed by the elastic deformation of the spring. The corrugated silicone wall 1 and the corrugated silicone wall 2 at the silicone connection position adopt a corrugated design, which can increase the distance of vibration propagation and effectively absorb vibration waves. It can improve the user's comfort and reduce vibration noise.

[0044] As an optional solution of the utility model, the motor vibration reduction silicone sleeve 1 is replaced with the motor vibration reduction silicone sleeve 2;

[0045] A conical boss is arranged on the second motor vibration-damping silicone sleeve, and a clamping groove is arranged on the support frame; the conical boss is clamped in the clamping groove of the support frame.

[0046] The motor vibration reduction silicone sleeve 2 is provided with five conical vibration reduction silicone columns. The conical vibration reduction silicone columns are provided with fixing slots; the muffler box body is provided with fixing holes;

[0047] The fixing groove of the conical vibration-damping silicone column is clamped in the fixing hole of the muffler box body.

[0048] Through the above technical solution, the silicone connection position also adopts a corrugated design, which can increase the distance of vibration propagation and effectively absorb vibration waves. The five conical vibration-damping silicone columns are integrated with the motor vibration-damping silicone sleeve, and the bottom is fixed in the round hole through a slot, which can make the motor run more smoothly when starting, accelerating, decelerating, and braking. It can improve the user's comfort and reduce vibration noise.

[0049] As an optional solution of the utility model, a plurality of screw holes are provided on the gas fairing; a circular baffle is detachably provided on the gas fairing;

[0050] The circular baffle is screwed onto the screw hole of the gas fairing.

[0051] The fairing O-ring is placed in the O-ring groove of the gas fairing.

[0052] A plurality of involute baffles are evenly arranged on the gas fairing; an airflow guide groove is formed between two adjacent involute baffles;

[0053] The gas fairing is provided with a fairing air inlet circular groove; the gas fairing is provided with a gas fairing protrusion.

[0054] Through the above technical solution, when the airflow enters the airflow guide groove from the fairing air intake circular groove, the messy airflow moves along the involutes and is output at the gas rectification convex position, thereby achieving the purpose of rectification and making the output airflow smoother. The airflow guide groove parameters and the number to be used can be designed according to the selected motor model. At the same time, using the acoustic resonance phenomenon, when the gas flow speed continues to increase, the density and pressure in the fluid also increase accordingly. When it reaches a certain value, the gas in the airflow guide groove will produce resonance fluctuations, the gas will slow down, and will be affected by the path difference effect and sound wave reflection, thereby reducing low-frequency noise.

[0055] As an optional solution of the utility model, an O-ring groove is provided on the honeycomb sampling tube.

[0056] The sampling tube O-ring is sleeved in the sampling tube O-ring groove.

[0057] A fixed card plate is provided on the honeycomb sampling tube, and a boss is provided on the fixed card plate;

[0058] The boss of the fixing clamping plate of the honeycomb sampling tube is inserted into the groove on the main body of the muffler box.

[0059] The honeycomb sampling tube is provided with a sampling hole and a sampling air inlet;

[0060] A honeycomb tube 1 is arranged in the honeycomb type sampling tube.

[0061] Through the above technical solution, the airflow passes through the sampling air inlet → sampling hole → digital differential pressure sensor sampling port, achieving the shortest sampling straight line distance and the shortest sampling signal time. Through algorithm control, the response speed of the motor can be improved. The shape, length and number of the honeycomb tube can be changed according to needs.

[0062] As an optional solution of the utility model, a honeycomb tube air outlet is provided on the honeycomb tube, and a plurality of honeycomb tube air outlets are provided on the muffler box body; a honeycomb tube one air outlet is provided on the honeycomb tube, and a plurality of honeycomb tube two air outlets are provided on the muffler box body; a plurality of motor air inlet ports are provided on the support frame; a gas fairing air inlet and a muffler box air outlet are provided on the gas fairing;

[0063] The gas flow path is: muffler air inlet → honeycomb tube one air outlet → honeycomb tube two air outlet → motor air intake cavity air inlet → fairing air inlet → muffler air outlet

[0064] Five silencer cavities are designed structurally:

[0065] First-stage silencer chamber: air outlet of the silencer box air inlet → air inlet of honeycomb tube one.

[0066] Secondary silencer cavity: air outlet of honeycomb tube 1 → air inlet of honeycomb tube 2

[0067] Level 3 silencer: honeycomb tube second air outlet → motor air inlet

[0068] Four-stage silencer: motor air intake outlet → motor air intake

[0069] Five-level silencer chamber: motor air outlet → fairing air inlet → silencer box air outlet.

[0070] Through the above technical solution, the five silencer cavities can make the airflow in the silencer cavity smoother than that at the air inlet or outlet, and the pressure fluctuation range of the sampling is small, thereby controlling the speed of the motor to run smoothly and the output airflow to be smoother, thereby also reducing noise.

[0071] The inner diameter, length and quantity of the honeycomb tube 2 can be changed according to requirements.

[0072] Through the above technical solution, multiple thin honeycomb tubes are set between the second-stage silencing chamber and the third-stage silencing chamber, and the thin honeycomb tubes need to ensure an effective ventilation cross-sectional area. Since the wavelength of high-frequency sound waves is short, they propagate in a narrow beam in the pipe. When the cross-sectional area of ​​the pipe is large, the contact between the sound waves and the pipe wall is reduced, thereby reducing the silencing amount of high-frequency sound. Therefore, multiple thin honeycomb tubes are set to increase the silencing amount to reduce high-frequency noise.

[0073] As an optional solution of the utility model, a honeycomb sampling tube connected to a digital differential pressure sensor is provided in the first-stage silencing chamber and the second-stage silencing chamber, and a pressure sampling port connected to a pressure sensor is provided in the fifth-stage silencing chamber. The motor speed is controlled by a single-chip microcomputer according to the collected signal, thereby realizing the regulation of gas flow and pressure.

[0074] 3. Beneficial effects

[0075] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0076] 1. The ventilator silencer provided by the utility model provides targeted technical solutions for the high frequency, medium frequency, low frequency, vibration and air flow smoothness of noise, and combined with spectrum analysis, it can effectively reduce the vibration and noise of the ventilator.

[0077] 2. The sampling ports on the digital differential pressure sensor and pressure sensor on the circuit board PCBA are connected to the sampling port on the muffler box through the shortest distance of the silicone tube, which is reliable, minimizes gas jitter, and has high sampling accuracy. The lower cover of the muffler box is integrated into the bottom cover of the ventilator, saving space and making the ventilator smaller. The display screen is fixed with the help of the muffler box, which is convenient for assembly and saves costs.

[0078] 3. Sponge is attached to the cavity. The porosity and looseness of the sponge are used. When sound waves enter the pores, the air and materials in the pores will vibrate slightly. Due to friction and viscous resistance, a considerable part of the sound energy is converted into heat energy and absorbed, thereby reducing high-frequency and medium-frequency noise. The outer cavity and the inner cavity are set up with a double-layer structure. The air layer in the double-layer structure can effectively absorb and isolate the energy of the sound waves, thereby reducing the transmission of noise. Silicone materials are used for vibration reduction and sealing.

[0079] 4. Setting five silencer cavities can make the airflow in the silencer cavity smoother relative to the air inlet or outlet, ensure a smaller pressure fluctuation range for sampling, and smoother output airflow, thereby ensuring smooth control of the motor speed, reducing motor vibration, and reducing noise. The inner diameter, length, and number of honeycomb tubes can be changed according to demand. Since the wavelength of high-frequency sound waves is short, they propagate in a narrow beam in the pipeline. When the cross-sectional area of ​​the pipeline is large, the contact between the sound waves and the pipe wall is reduced, thereby reducing the amount of high-frequency sound attenuation. Multiple thin honeycomb tubes are used to increase the amount of attenuation to reduce high-frequency noise.

[0080] 5. The elastic deformation of the spring is used to absorb the vibration energy generated by the motor when it is running. The corrugated design of the silicone connection position can increase the distance of vibration propagation, effectively absorb vibration waves, improve user comfort and reduce vibration noise.

[0081] 6. The conical vibration-damping silicone column and the motor vibration-damping silicone sleeve are integrally formed, and the bottom is fixed in the round hole through a slot, which can make the motor's running posture more stable during starting, accelerating, decelerating, and braking, and can reduce vibration noise.

[0082] 7. When the airflow enters the airflow guide groove from the fairing air intake circular groove, the disordered airflow flows in the form of an involute and is output at the gas rectification convex position, thereby achieving the purpose of rectification and making the output airflow smoother.

[0083] 8. Set up a honeycomb sampling tube, and the air flow passes through the sampling air inlet → sampling hole → digital differential pressure sensor sampling port to achieve the shortest sampling straight line distance and the shortest sampling signal time, thereby improving the response speed of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0084] Figure 1 The utility model is a schematic diagram of the overall structure of the ventilator silencer box according to the embodiment of the present invention.

[0085] Figure 2 The utility model is a schematic diagram of the exploded structure of the ventilator silencer box according to the embodiment of the utility model.

[0086] Figure 3 The figure is a gas flow diagram of the muffler box of the ventilator according to the embodiment of the utility model.

[0087] Figure 4This is a schematic diagram of a motor vibration-damping silicone sleeve of a ventilator silencer box according to an embodiment of the utility model.

[0088] Figure 4 a is a schematic diagram of a motor vibration-damping silicone sleeve.

[0089] Figure 4 b is Figure 4 AA section view in a.

[0090] Figure 4 c is Figure 4 a is the BB section view.

[0091] Figure 4 d is Figure 4 c: Enlarged view of part D.

[0092] Figure 4 e is Figure 4 Enlarged view of part C in b.

[0093] Figure 5 This is a second schematic diagram of a motor vibration-damping silicone sleeve of a ventilator silencer box according to an embodiment of the utility model.

[0094] Figure 5 a is a schematic diagram of the second motor vibration-damping silicone sleeve.

[0095] Figure 5 b is a schematic diagram of the coordination between the support frame and the motor vibration-damping silicone sleeve.

[0096] Figure 5 c is Figure 5 KK section view in b.

[0097] Figure 5 d is Figure 5 JJ section view in b.

[0098] Figure 6 It is a schematic diagram of the gas fairing of the muffler box of the ventilator according to an embodiment of the utility model.

[0099] Figure 6 a is a schematic diagram of the gas fairing.

[0100] Figure 6 b is a side view of the gas fairing.

[0101] Figure 6 c is Figure 6 b is the FF section view.

[0102] Figure 6 d is Figure 6 b is the EE section view.

[0103] Figure 7 It is a schematic diagram of the honeycomb sampling tube of the ventilator silencer box according to the embodiment of the utility model.

[0104] Figure 7 a is a schematic diagram of a honeycomb sampling tube.

[0105] Figure 7 b is a side view of the honeycomb sampling tube.

[0106] Figure 7 c is Figure 7 GG section view in b.

[0107] Figure 7 d is Figure 7 HH section view in b.

[0108] 1. Upper cover of silencer box; 2. Silencing sponge 1; 3. Support frame; 4. Motor; 5. Silicone tube at motor outlet; 6. Silicone sleeve 1 for motor vibration reduction; 7. Silicone sealing sheet 1; 8. Spring; 9. Silencing sponge 2; 10. Silencing box body; 11. Silicone sealing sheet 2; 12. O-ring for sampling tube; 13. Honeycomb sampling tube; 14. Inlet pipe; 15. Silencing sponge 3; 16. Lower cover of silencer box; 17. O-ring for fairing; 18. Round baffle; 19. Gas fairing; 20. Silicone sleeve 2 for motor vibration reduction; 101. Screw hole for fixing circuit board; 102. Sampling port 1 for digital differential pressure sensor; 103. Sampling port 2 for digital differential pressure sensor; 1 04. Sampling port of pressure sensor; 105. Screw fixing hole; 106. Display screen fixing bracket; 110. Fixing hole; 13. Honeycomb sampling tube; Sampling tube O-ring card slot 131; 132. Fixing card plate; 133. Sampling hole; 134. Sampling air inlet; 135. Honeycomb tube 1; 191. Involute baffle; 192. Airflow guide groove; 193. Fairing air inlet circular groove; 194. Gas rectification protrusion; 195. Screw fixing hole; 201. Conical vibration-damping silicone column; 202. Fixing card slot; 203. Silicone buckle; 301. Support frame card slot; 501. Corrugated silicone wall 1; 601. Conical boss; 602. Corrugated silicone wall 2;

[0109] U. Muffler air inlet; V. Honeycomb tube one air outlet; W. Honeycomb tube two air outlet; X. Motor air intake cavity air inlet; Y. Fairing air inlet; Z. Muffler air outlet. DETAILED DESCRIPTION

[0110] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0111] The present application is further described in detail below in conjunction with the accompanying drawings.

[0112] Reference Figure 1 The utility model provides a breathing machine muffler box, comprising: a muffler box upper cover 1, a muffler box body 10, a muffler box lower cover 16, an air inlet pipe 14 and a gas fairing 19;

[0113] The muffler upper cover 1, the muffler main body 10 and the muffler lower cover 16 are detachably fixed together;

[0114] The upper cover 1 of the muffler box, the main body 10 of the muffler box and the lower cover 16 of the muffler box are all provided with screw fixing holes 105, and the upper cover 1 of the muffler box, the main body 10 of the muffler box and the lower cover 16 of the muffler box are fixed together by the screw fixing holes 105 and screws.

[0115] A silicone sealing sheet 1 7 is provided between the muffler upper cover 1 and the muffler body 10; a silicone sealing sheet 2 11 is provided between the muffler body 10 and the muffler lower cover 16;

[0116] The air intake pipe 14 is plugged into the lower cover 16 of the muffler box; the air intake pipe 14 is inserted into the lower cover 16 of the muffler box through a slot. The air intake pipe 14 is provided with an air intake port U of the muffler box;

[0117] The muffler upper cover 1 and the muffler body 10 are both provided with a card slot;

[0118] The gas fairing 19 is inserted into the slots of the muffler upper cover 1 and the muffler body 10. The gas fairing 19 is provided with a muffler gas outlet Z;

[0119] Fresh gas enters through the muffler air inlet U and flows out through the muffler air outlet Z.

[0120] The upper cover 1 of the muffler box is provided with a plurality of circuit board fixing screw holes 101;

[0121] The upper cover 1 of the muffler box is provided with a digital differential pressure sensor sampling port 102, a digital differential pressure sensor sampling port 2 103 and a pressure sensor sampling port 104;

[0122] The external circuit board PCBA is fixed on the upper cover 1 of the muffler box through screws and circuit board fixing screw holes 101 .

[0123] The external digital differential pressure sensor can be connected to the digital differential pressure sensor sampling port 1 102 and the digital differential pressure sensor sampling port 2 103 by using a silicone tube.

[0124] The external pressure sensor can be connected to the pressure sensor sampling port 104 using a silicone tube.

[0125] A display screen fixing frame 106 is arranged on the upper cover 1 of the muffler box; the upper part of the external display screen is clamped on the display screen fixing frame 106, and the rest is fixed by the bottom cover slot and the outer shell.

[0126] In this technical solution, the lower cover 16 of the muffler is integrated into the bottom cover of the ventilator, saving space and making the ventilator smaller. The sampling ports on the digital differential pressure sensor and the pressure sensor on the circuit board PCBA are connected with the digital differential pressure sensor sampling port 1 102 and the digital differential pressure sensor sampling port 2 103 on the muffler by the shortest distance through the silicone tube, which has reliable connection, minimum gas jitter and high sampling accuracy. The display screen is fixed with the help of the muffler, which is convenient for assembly and saves costs.

[0127] Reference Figure 2 A silencer sponge 2 is pasted on the upper cover 1 of the silencer box. A support frame 3 is fixedly arranged on the inner side of the silencer sponge 2; a motor vibration reduction silicone sleeve 6 is clamped on the support frame 3;

[0128] The motor 4 is arranged in the motor vibration-reducing silicone sleeve 6; a boss is arranged at the air outlet of the motor 4; and the corresponding position of the motor 4 is placed in the motor vibration-reducing silicone sleeve 6.

[0129] The motor outlet silicone tube 5 is clamped on the outlet boss of the motor 4. A plurality of impellers are fixedly arranged on the rotating shaft of the motor 4;

[0130] A conical boss is arranged on the motor vibration-damping silicone sleeve 6 , and a card slot is arranged on the support frame 3 ; the conical boss is card-connected in the card slot of the support frame 3 .

[0131] The muffler box body 10 is provided with a groove;

[0132] A sound-absorbing sponge 9 is pasted in the groove of the sound-absorbing box body 10.

[0133] A spring fixing column is fixedly arranged on the muffler box body 10 ; five through grooves are arranged on the muffler sponge 2 9 ; springs 8 are arranged in the through grooves; and the five springs 8 are inserted into the spring fixing column of the muffler box body 10 .

[0134] The silicone sealing sheet 7 is arranged on the upper plane of the muffler box body 10.

[0135] The muffler box body 10 is provided with a groove, in which a honeycomb sampling tube 13 is inserted; a protrusion is provided on the honeycomb sampling tube 13; and an O-ring groove is provided on the honeycomb sampling tube 13;

[0136] A sampling tube O-ring 12 is sleeved in the O-ring groove of the honeycomb sampling tube 13 .

[0137] The protrusion of the honeycomb sampling tube 13 is inserted into the groove on the muffler box body 10 .

[0138] A sound-absorbing sponge 3 15 is pasted on the bottom surface of the sound-absorbing box lower cover 16 .

[0139] The lower cover 16 of the muffler box is provided with a groove, and the intake pipe 14 is inserted in the groove. The intake pipe 14 is provided with a protrusion, and the protrusion of the intake pipe 14 is inserted into the groove on the lower cover 16 of the muffler box.

[0140] The silicone sealing sheet 11 is placed on the lower plane of the muffler box body 10 .

[0141] The gas fairing 19 is provided with screw holes, and a circular baffle 18 is provided on the gas fairing 19 through the screws and the screw holes.

[0142] The gas fairing 19 is provided with an O-ring groove, in which a fairing O-ring 17 is provided; the fairing O-ring 17 is put into the O-ring groove of the gas fairing 19 .

[0143] In this technical solution, the porosity and looseness of the muffler sponge 1 2, the muffler sponge 2 9 and the muffler sponge 3 15 are utilized. When sound waves enter the pores, the air and materials in the pores are caused to vibrate slightly. Due to friction and viscous resistance, a considerable part of the sound energy is converted into heat energy and absorbed, thereby reducing high-frequency and medium-frequency noise. The outer cavity is formed by the muffler upper cover 1, the muffler main body 10 and the muffler lower cover 16, and the inner cavity is formed by the support frame 3 and the motor vibration reduction silicone sleeve 6. The double-layer structure, the air layer in the double-layer structure can effectively absorb and isolate the energy of the sound waves, thereby reducing the transmission of noise. The silicone material is used for vibration reduction and sealing.

[0144] Reference Figure 4 , Figure 4 a. Figure 4 b. Figure 4 c Figure 4 d and Figure 4 e. A conical boss 601 is provided on the motor vibration reduction silicone sleeve 6. The conical boss 601 is clamped in the clamping groove of the support frame 3.

[0145] Five springs 8 support the motor vibration-damping silicone sleeve 6.

[0146] A corrugated silicone wall 501 is provided on the motor air outlet silicone tube 5, and a corrugated silicone wall 602 is provided on the motor vibration reduction silicone sleeve 6.

[0147] In this technical solution, a spring 8 is used to support the motor vibration reduction silicone sleeve 6. The wire diameter, diameter, length parameters of the spring and the number of springs required can be designed according to the selected motor weight and the vibration amplitude during operation. Spring vibration reduction is a mechanical vibration reduction technology that mainly absorbs the vibration energy generated by the motor during operation through the elastic deformation of the spring. The corrugated silicone wall 1 501 and the corrugated silicone wall 2 602 at the silicone connection position adopt a corrugated design, which can increase the distance of vibration propagation and effectively absorb vibration waves. It can improve the user's comfort and reduce vibration noise.

[0148] Reference Figure 5 , Figure 5 a. Figure 5 b. Figure 5 c and Figure 5 d. The motor vibration reduction silicone sleeve 1 6 can be replaced with the motor vibration reduction silicone sleeve 2 20;

[0149] A conical boss 203 is provided on the motor vibration-damping silicone sleeve 20 , and a support frame 301 is provided on the support frame 3 ; the conical boss 203 is clamped in the clamping groove of the support frame 301 .

[0150] The motor vibration-damping silicone sleeve 20 is provided with five conical vibration-damping silicone columns 201. The conical vibration-damping silicone columns 201 are provided with fixing slots 202; the muffler box body 10 is provided with fixing holes 110;

[0151] The fixing groove 202 of the conical vibration-damping silicone column is stuck in the fixing hole 110 of the muffler box body 10 .

[0152] In this technical solution, the silicone connection position also adopts a corrugated design, which can increase the distance of vibration propagation and effectively absorb vibration waves. The five conical vibration-damping silicone columns are integrated with the motor vibration-damping silicone sleeve, and the bottom is fixed in the round hole through a slot, which can make the motor run more smoothly when starting, accelerating, decelerating, and braking. It can improve the user's comfort and reduce vibration noise.

[0153] Reference Figure 6 , Figure 6 a. Figure 6 b. Figure 6 c and Figure 6 d. A plurality of screw holes 195 are provided on the gas fairing 19; a circular baffle 18 is detachably provided on the gas fairing 19;

[0154] The circular baffle 18 is screwed onto the screw hole 195 of the gas fairing 19.

[0155] The fairing O-ring 17 is placed in the O-ring groove of the gas fairing 19 .

[0156] A plurality of involute baffles 191 are evenly arranged on the gas fairing 19; an airflow guide groove 192 is formed between two adjacent involute baffles 191;

[0157] The gas fairing 19 is provided with a fairing air inlet circular groove 193 ; the gas fairing 19 is provided with a gas fairing protrusion 194 .

[0158] In this technical solution, the airflow guide groove 192 is surrounded by adjacent involute baffles 191, and the involute baffles are evenly distributed. When the airflow enters the airflow guide groove 192 from the fairing air intake circular groove 193, the messy airflow moves along each involute and is output at the position of the gas rectification protrusion 194, thereby achieving the purpose of rectification and making the output airflow smoother. The airflow guide groove parameters and the number to be used can be designed according to the selected motor model. At the same time, using the acoustic resonance phenomenon, when the gas flow speed continues to increase, the density and pressure in the fluid also increase accordingly. When it reaches a certain value, the gas in the airflow guide groove will produce resonance fluctuations, the gas will slow down, and will be affected by the path difference effect and sound wave reflection, thereby reducing low-frequency noise.

[0159] Reference Figure 7 , Figure 7 a. Figure 7 b. Figure 7 c and Figure 7 d. An O-ring groove 131 is provided on the honeycomb sampling tube 13.

[0160] The sampling tube O-ring 12 is sleeved in the sampling tube O-ring groove 131 .

[0161] A fixed clamping plate 132 is provided on the honeycomb sampling tube 13, and a boss is provided on the fixed clamping plate 132;

[0162] The boss of the fixing clamping plate 132 of the honeycomb sampling tube 13 is inserted into the groove on the muffler box body 10 .

[0163] The honeycomb sampling tube 13 is provided with a sampling hole 133 and a sampling air inlet 134;

[0164] A honeycomb tube 135 is arranged inside the honeycomb sampling tube 13.

[0165] In this technical solution, the airflow passes through the sampling air inlet 134 → sampling hole 133 → digital differential pressure sensor sampling port, achieving the shortest sampling straight line distance and the shortest sampling signal time. Through algorithm control, the response speed of the motor can be improved. The shape, length and number of the honeycomb tube can be changed according to needs.

[0166] Reference Figure 3, Schematic diagram of gas flow in the muffler, a honeycomb tube 1 outlet V is provided on the honeycomb tube 135, and a plurality of honeycomb tube 2 outlets W are provided on the muffler body 10; a plurality of motor suction cavity air inlets X are provided on the support frame 3; a fairing air inlet Y and a muffler outlet Z are provided on the gas fairing 19;

[0167] The gas flow path is: muffler air inlet U → honeycomb tube one air outlet V → honeycomb tube two air outlet W → motor suction chamber air inlet X → fairing air inlet Y → muffler air outlet Z

[0168] Five silencer cavities are designed structurally:

[0169] First-stage silencer chamber: air outlet of the silencer box air inlet → air inlet of honeycomb tube one.

[0170] Secondary silencer cavity: air outlet of honeycomb tube 1 → air inlet of honeycomb tube 2

[0171] Level 3 silencer: honeycomb tube second air outlet → motor air inlet

[0172] Four-stage silencer: motor air intake outlet → motor air intake

[0173] Five-level silencer chamber: motor air outlet → fairing air inlet → silencer box air outlet.

[0174] In this technical solution, the five silencer cavities can make the airflow in the silencer cavity smoother than that at the air inlet or outlet, and the pressure fluctuation range of the sampling is small, thereby controlling the speed of the motor to run smoothly and the output airflow to be smoother, which can also reduce noise.

[0175] Furthermore, the inner diameter, length and quantity of the honeycomb tube 2 can be changed according to requirements.

[0176] In this technical solution, multiple thin honeycomb tubes are set between the second-stage muffler and the third-stage muffler, and the thin honeycomb tubes need to ensure an effective ventilation cross-sectional area. Since the wavelength of high-frequency sound waves is short, they propagate in a narrow beam in the pipe. When the cross-sectional area of ​​the pipe is large, the contact between the sound waves and the pipe wall is reduced, thereby reducing the muffler amount of high-frequency sound. Therefore, multiple thin honeycomb tubes are set to increase the muffler amount to reduce high-frequency noise.

[0177] Furthermore, a honeycomb sampling tube connected to a digital differential pressure sensor is provided in the first-stage silencing chamber and the second-stage silencing chamber, and a pressure sampling port connected to a pressure sensor is provided in the fifth-stage silencing chamber. The motor speed is controlled by a single-chip microcomputer according to the collected signal, thereby realizing the regulation of gas flow and pressure.

[0178] The motor model selected for the test has a noise source of 60dB. It needs to reduce the noise by more than 30dB to meet the product technical requirements. According to the measured spectrum characteristics, the target anechoic frequency band is locked, and the following design parameters are continuously optimized. The noise value is less than 30dB, which meets the product technical requirements.

[0179] The optimized parameters are:

[0180] a. Inlet pipe 14: diameter 15mm;

[0181] b. Honeycomb tube 1: 8 in number, pore diameter 0.7mm, length 10mm.

[0182] c. Honeycomb tube 2: 13 in number, 5mm in diameter, 40mm in length

[0183] d. Sponge: thickness 3-10mm, density 50ppi.

[0184] e. Spring: wire diameter 0.4mm, diameter 5mm, length 15mm.

[0185] f.Silicone: Shore hardness 30.

[0186] g. Gap between inner and outer cavities: 4-8mm.

[0187] The implementation principle of a ventilator silencer box in the present application is: when in use, the silencer box air inlet U→honeycomb tube first air outlet V→honeycomb tube second air outlet W→motor suction chamber air inlet X→fairing air inlet Y→silencer box air outlet Z, and this gas flow path passes through the first-level silencer chamber, the second-level silencer chamber, the third-level silencer chamber, the fourth-level silencer chamber, and the fifth-level silencer chamber respectively.

[0188] Since targeted technical solutions are provided for the high frequency, medium frequency, low frequency, vibration, and airflow smoothness of noise, combined with spectrum analysis, the noise and vibration of the ventilator can be effectively reduced.

[0189] In the first-stage and second-stage silencing chambers, honeycomb sampling tubes are connected to digital differential pressure sensors, and in the fifth-stage silencing chamber, pressure sampling ports are connected to pressure sensors. The motor speed is controlled by a single-chip microcomputer according to the collected signals, thereby achieving the regulation of gas flow and pressure.

[0190] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A ventilator muffler box, comprising: a muffler upper cover, a muffler main body, a muffler lower cover, an air inlet pipe and a gas fairing; characterized in that: The muffler box upper cover, the muffler box main body and the muffler box lower cover are detachably fixed together; A silicone sealing sheet is arranged between the upper cover of the muffler box, the main body of the muffler box and the lower cover of the muffler box; The air intake pipe is plugged with the lower cover of the muffler box; the air intake pipe is provided with an air intake port of the muffler box; The gas fairing is plugged with the upper cover of the muffler box and the main body of the muffler box; the gas fairing is provided with a muffler box gas outlet; A silencer sponge is pasted on the upper cover of the silencer box; a support frame is fixedly arranged on the inner side of the silencer sponge; and a motor vibration reduction silicone sleeve is clamped on the support frame; The motor is arranged inside the motor vibration reduction silicone sleeve.

2. The ventilator muffler box according to claim 1, characterized in that: The upper cover of the muffler box is provided with a plurality of circuit board fixing screw holes; The upper cover of the muffler box is provided with a sampling port for a digital differential pressure sensor and a sampling port for a pressure sensor; The motor air outlet boss is clamped and provided with a motor air outlet silicone tube; The motor vibration reduction silicone sleeve is clamped with the support frame; A sound-absorbing sponge is pasted in the groove of the sound-absorbing box body; A spring fixing column is fixedly arranged on the main body of the muffler box; a spring is inserted and arranged on the spring fixing column; A sound-absorbing sponge is pasted on the bottom surface of the lower cover of the sound-absorbing box.

3. The ventilator muffler box according to claim 2, characterized in that: The muffler box body is provided with a honeycomb sampling tube plugged in; the honeycomb sampling tube is provided with an O-ring groove; An air intake pipe is plugged and arranged on the lower cover of the muffler box; A removable circular baffle is provided on the gas fairing; and a fairing O-type sealing ring is provided on the gas fairing.

4. The ventilator muffler box according to claim 2, characterized in that: A conical boss is arranged on the motor vibration reduction silicone sleeve; the conical boss is clamped in the clamping groove of the support frame; A corrugated silicone wall 1 is arranged on the silicone tube at the air outlet of the motor, and a corrugated silicone wall 2 is arranged on the first vibration-reducing silicone sleeve of the motor.

5. The ventilator muffler box according to claim 2, characterized in that: The second motor vibration reduction silicone sleeve is provided with five conical vibration reduction silicone columns; the conical vibration reduction silicone columns are provided with fixing slots; and the muffler box body is provided with fixing holes; The conical vibration-damping silicone column is snap-connected with the main body of the muffler box.

6. The ventilator muffler box according to claim 2, characterized in that: A circular baffle is detachably provided on the gas fairing; A plurality of involute baffles are evenly arranged on the gas fairing; an airflow guide groove is formed between two adjacent involute baffles; The gas fairing is provided with a fairing air inlet circular groove; the gas fairing is provided with a gas fairing protrusion.

7. The ventilator muffler box according to claim 3, characterized in that: The honeycomb type sampling tube is sleeved with a sampling tube O-type seal; A fixed card plate is provided on the honeycomb sampling tube, and a boss is provided on the fixed card plate; The fixed clamping plate is clamped with the main body of the muffler box; the honeycomb sampling tube is provided with a sampling hole and a sampling air inlet; and a honeycomb tube is provided inside the honeycomb sampling tube.

8. The ventilator muffler box according to claim 7, characterized in that: The honeycomb tube is provided with a honeycomb tube air outlet, and the muffler box body is provided with a plurality of honeycomb tube air outlets; the support frame is provided with a plurality of motor air intakes; the gas fairing is provided with a fairing air inlet and a muffler box air outlet; The gas flow path is: muffler box air inlet → honeycomb tube one air outlet → honeycomb tube two air outlet → motor air intake cavity air inlet → fairing air inlet → muffler box air outlet; five muffler cavities are designed structurally: First-stage silencer cavity: the air outlet of the silencer box air inlet → the air inlet of the honeycomb tube 1; Secondary silencing chamber: air outlet of honeycomb tube 1 → air inlet of honeycomb tube 2; The third-level silencer cavity: the second air outlet of the honeycomb tube → the air inlet of the motor suction cavity; Four-stage silencer cavity: motor air intake cavity outlet → motor air intake; Five-stage silencer cavity: motor air outlet → fairing air inlet → silencer box air outlet; Make the airflow in the silencer cavity smoother relative to the air inlet or outlet, reducing noise.

9. The ventilator muffler box according to claim 1, characterized in that: The sampling ports on the digital differential pressure sensor and the pressure sensor on the external circuit board PCBA are connected to the sampling port on the silencer box through a silicone tube, and the lower cover of the silencer box is integrated in the bottom cover of the ventilator.

10. The ventilator muffler box according to claim 5, characterized in that: The conical vibration-damping silicone column and the motor vibration-damping silicone sleeve are integrally formed, making the motor's running posture smoother during starting, accelerating, decelerating and braking, and reducing vibration noise.

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