Low-noise silencing box for breathing machine and breathing machine

Abstract

The utility model provides a low-noise silencing box for a breathing machine and the breathing machine. The low-noise silencing box comprises a first shell, a second shell, a shell sealing piece, a resistant rib group and a noise reduction mechanism, the first shell and the second shell are spliced to form a whole box shell, and an air inlet noise reduction cavity and a fan cavity are formed in the whole box shell. The resistance rib group divides the air inlet noise reduction cavity into at least two communicated air path cavities; the gas path chamber at the tail end is communicated with the fan chamber; and the noise reduction mechanism is arranged below the air inlet of the fan. The resistance rib sets are arranged in the first shell and the second shell which are arranged in the radial direction of the fan respectively, the independently-arranged air inlet noise reduction cavity is divided into the multiple air path cavities, the fan is installed on the side away from the air inlet, the air path is prolonged, the reflection frequency during noise transmission is increased, and noise is reduced; the noise reduction mechanism arranged at the bottom of the air inlet of the fan further reduces noise, stabilizes flow and pressure, and improves the noise reduction effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument technical field, specifically, relate to a low noise silencer for breathing machine and breathing machine. BACKGROUND

[0002] The patient with obstructive sleep apnea and chronic obstructive pulmonary disease needs to use the breathing machine for auxiliary treatment, and during the treatment process, the patient is in the sleep state most of the time, and the surrounding environment is required to be quiet and comfortable. However, the breathing machine pressurizes the gas in the pipeline by the fan, and then plays a therapeutic effect on the patient. The fan will inevitably make noise during the working process, which affects the sleep of the patient.

[0003] The prior art mainly improves the installation and fixing mode of the fan to reduce the noise of the fan, mainly designs the internal gas flow path of the breathing machine to reduce the pneumatic noise, and sets the sound-absorbing material to reduce the noise.

[0004] Although the above-mentioned solutions have achieved certain effects, there are still the following problems:

[0005] In order to realize the fixation of the fan, the structure of the fixing device is relatively complex, which directly increases the volume of the breathing machine, and the use of the breathing machine is restricted by space and position, and it is not convenient to move and transport. In order to optimize the gas path design, the internal structure of the fan box is complex, which greatly increases the internal gas resistance of the breathing machine, increases the operating load of the fan, and accelerates the equipment loss; in order to make the airway positive pressure stable, the operating load and noise of the fan are increased, which increases the loss of the fan; and the sound-absorbing material in the sound-absorbing material may decompose fragments and release harmful gas for a long time, which has serious health risks. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a low noise silencer for breathing machine and breathing machine, to solve the technical problem of noise generated in the running process of the breathing machine in the prior art, which affects the patient's use experience.

[0007] The technical scheme of the utility model is:

[0008] According to the first aspect of the utility model, a low noise silencer for breathing machine, including first casing, second casing, resistance group and noise reduction mechanism, first casing and second casing are sealedly connected through casing seal piece to constitute whole box casing, have air inlet noise reduction chamber and fan chamber in whole box casing inside, among them, first casing and second casing distribute along the motor radial or axial direction of fan, resistance group sets up in air inlet noise reduction chamber, and air inlet noise reduction chamber is divided into at least two intercommunicating air path chambers, the air path chamber of end and fan chamber intercommunication, fan is hung in fan chamber through fan cover, and noise reduction mechanism is constructed below fan air inlet.

[0009] Further, resistance groups are respectively arranged in the first casing and the second casing, and the resistance groups in the two casings are arranged symmetrically. The resistance group includes a pair of flow guide rib plates and a pair of cavity separation rib plates. The pair of cavity separation rib plates are used to separate the air path chambers on both sides, and the pair of flow guide rib plates are installed one by one on the pair of cavity separation rib plates and connect the air path chambers on both sides, and the pair of flow guide rib plates are staggered between them.

[0010] Further, the noise reduction mechanism adopts one or more combinations of a noise reduction volute, a noise reduction baffle and a noise reduction resistance material block.

[0011] Further, the noise reduction mechanism is a noise reduction volute. The rotation direction of the flow guide rib of the noise reduction volute is consistent with the rotation direction of the fan impeller. The area ratio of the air inlet cross section of the noise reduction volute to the air inlet cross section of the fan is 90-110%. The cross-sectional shape of the noise reduction volute is set as a fan shape or a vortex line shape.

[0012] Further, the noise reduction mechanism is a noise reduction baffle. The noise reduction baffle has micropores arranged thereon, and the bottom of the noise reduction baffle is provided with a space to form a noise reduction cavity.

[0013] Further, the pair of flow guide rib plates are arranged in parallel or in a flared shape along the air inlet direction.

[0014] Further, the flow guide rib plate includes a first flow guide rib plate and a second flow guide rib plate. The air path chamber includes a first air path chamber, a second air path chamber and a third air path chamber connected in sequence. The first casing is provided with an air inlet communicating with the first air path chamber. The pair of first flow guide rib plates connect the first air path chamber and the second air path chamber. The pair of second flow guide rib plates connect the second air path chamber and the third air path chamber.

[0015] Further, the low noise silencer further includes an air inlet pipe arranged in the first air path chamber and communicating with the air inlet. The air inlet pipe is bent towards the top of the first air path chamber.

[0016] Further, the low noise silencer further includes a laminar flow pipe connecting the third air path chamber and the fan chamber.

[0017] Further, the length of the second air path chamber along the air inlet direction is L, the length of the first flow guide rib plate is L / 4, and the length of the second flow guide rib plate is L / 2.

[0018] Further, the low-noise sound elimination box further comprises a differential pressure flow sensor, and detection heads of the differential pressure flow sensor are arranged in the first air path chamber and the fan chamber respectively.

[0019] Further, the air outlet end of the terminal air path chamber is located at an end away from the fan air outlet.

[0020] Further, resistance rib groups are arranged in the first shell and the second shell respectively, and the resistance rib groups in the two shells are symmetrically arranged; the resistance rib group comprises a flow guide rib plate and a cavity rib plate; the flow guide rib plate and the cavity rib plate are both multiple, each cavity rib plate is used for separating the air path chambers on both sides, each flow guide rib plate is installed on each cavity rib plate one by one, and the flow guide rib plates are staggered and distributed between the flow guide rib plates and form a flow guide channel.

[0021] Further, the first demarcation surface of the fan chamber and the air inlet noise reduction chamber and the second demarcation surface of the abutment of the first shell and the second shell are perpendicular.

[0022] Further, the shell sealing element comprises a sealing frame and a sealing inner strip plate, the arrangement form of the sealing inner strip plate is the same as the layout of the resistance rib group in the first shell and the second shell, and grooves sealingly connected with the flow guide rib plate and the cavity rib plate are arranged on both sides of the sealing inner strip plate.

[0023] Further, a support rib group for mounting the fan sleeve is arranged on the inner wall of the circumferential side of the fan chamber; the support rib group comprises at least four fan support ribs, and the fan support ribs are adaptively connected with the annular groove arranged on the fan sleeve.

[0024] Further, the fan sleeve comprises a sleeve body and a first buffer element, the first buffer element is multiple, the multiple first buffer elements are arranged on the outer peripheral wall of the sleeve body in a circumferential direction, and each first buffer element is detachably connected with the inner wall of the fan chamber.

[0025] Further, the whole box shell further has a buffer chamber, the buffer chamber is communicated with the fan chamber and corresponds to the fan air outlet.

[0026] Further, the low-noise sound elimination box further comprises a second buffer element, and the second buffer element is communicated with the fan air outlet and the buffer chamber.

[0027] Further, the low-noise sound elimination box further comprises a first pressure sensor, and a detection head of the first pressure sensor is arranged in the buffer chamber.

[0028] According to the second aspect of the utility model, a breathing machine comprises a switching chamber, a water tank and the above-mentioned low-noise sound elimination box, the water tank is communicated with the low-noise sound elimination box and the switching chamber respectively, and the switching chamber is used for being communicated with a patient end.

[0029] Further, the breathing machine further comprises a second pressure sensor, wherein a probe head of the second pressure sensor is arranged in the adapter chamber; or the low-noise silencer further comprises a containing chamber, the probe head of the second pressure sensor is arranged in the containing chamber, and the containing chamber is communicated with the adapter chamber.

[0030] Further, the breathing machine further comprises a machine shell, the water tank is detachably connected with the machine shell, and a position detection sensor is arranged at a connecting position of the machine shell and the water tank, and is used for detecting whether the water tank and the machine shell are connected in place.

[0031] Compared with the prior art, the breathing machine has the following advantages:

[0032] (1) The silencer is divided into a first shell and a second shell, the first shell and the second shell are distributed along the radial direction of the fan, half of the fan chamber and half of the noise reduction flow channel chamber are arranged in the first shell and the second shell, and the shell separation line and the chamber separation line are perpendicular to each other, so that the fan is installed on the side away from the air inlet, the gas path is lengthened, the number of reflections during noise propagation is increased, and the noise is reduced. In addition, a noise reduction mechanism is arranged at the bottom of the fan air inlet, the noise reduction mechanism and the noise reduction flow channel chamber are impedance type composite silencers, and the noise reduction effect is improved.

[0033] (2) A plurality of resistance rib groups are arranged in the flow channel chamber, the flow channel chamber is divided into a plurality of small chambers, the sizes of the small chambers are different, and the small chambers are arranged in a staggered manner, the staggered design of the plurality of chambers lengthens the gas path and the number of noise reflections, and improves the noise reduction effect.

[0034] (3) The noise reduction mechanism adopts a combination of one or more of a noise reduction volute, a noise reduction baffle and a noise reduction resistive material block, wherein the cross-sectional shape of the noise reduction volute is arranged in a fan impeller shape or a vortex line shape, the rotation direction of the rib plate of the noise reduction volute is consistent with the rotation direction of the fan impeller, the air inlet cross-sectional area of the noise reduction volute is equivalent to the air inlet cross-sectional area of the fan, the airflow entering the fan is guided and stabilized in advance, and the turbulence phenomenon at the air inlet of the fan is reduced.

[0035] (4) A plurality of support rib groups are arranged on the side of the fan chamber and the shell sealing element to mount the fan cover, the fan is suspended by being flexibly wrapped by the fan cover, the stability of the fan installation is improved, and the shock absorption and noise reduction are achieved.

[0036] (5) Part of the noise generated by the fan is incident on the shell wall and is absorbed and projected, most of the noise propagates along the gas flow path, and finally is transmitted from the air inlet, the noise at the air outlet of the fan is reduced by the buffer chamber; the noise at the air inlet of the fan is reduced by the laminar flow pipe, the second flow guide rib plate and the first flow guide rib plate, and effective noise reduction is achieved in the entire internal chamber. BRIEF DESCRIPTION OF DRAWINGS

[0037] The utility model discloses further describe below combining with the drawings and examples:

[0038] Figure 1 It is the exploded view schematic diagram of low noise silencer box in an embodiment of the utility model;

[0039] Figure 2 It is the structure schematic diagram of first casing in an embodiment of the utility model;

[0040] Figure 3 It is the structure schematic diagram of second casing in an embodiment of the utility model;

[0041] Figure 4 It is the structure schematic diagram of fan installation in second casing in an embodiment of the utility model;

[0042] Figure 5 It is the three-dimensional schematic diagram of fan installation in casing seal in an embodiment of the utility model;

[0043] Figure 6 It is the whole appearance three-dimensional structure schematic diagram of low noise silencer box in an embodiment of the utility model;

[0044] Figure 7 It is the sectional view of the low noise silencer box of the noise reduction mechanism embodiment one of the utility model;

[0045] Figure 8 It is the sectional view of the low noise silencer box of the noise reduction mechanism embodiment two of the utility model;

[0046] Figure 9 It is the sectional view of the low noise silencer box of the noise reduction mechanism embodiment three of the utility model;

[0047] Figure 10 It is the discontinuous spiral example drawing of the noise reduction volute in the noise reduction mechanism embodiment one of the utility model;

[0048] Figure 11 It is the continuous spiral example drawing of the noise reduction volute in the noise reduction mechanism embodiment one of the utility model;

[0049] Figure 12 It is the curved leaf example drawing of the noise reduction volute in the noise reduction mechanism embodiment one of the utility model;

[0050] Figure 13 It is the example drawing of the assembly combination of the noise reduction mechanism of the utility model and carries out the noise reduction;

[0051] Figure 14 It is the overhead plane schematic diagram of the noise reduction mechanism of the utility model;

[0052] Figure 15The explosion diagram of the low-noise sound-absorbing box is shown in another embodiment of the utility model;

[0053] Figure 16 The structure diagram of one angle of the first shell and the fan is shown in another embodiment of the utility model;

[0054] Figure 17 The structure diagram of another angle of the first shell and the fan is shown in another embodiment of the utility model;

[0055] Figure 18 The cross-sectional view of the first shell and the fan is shown in another embodiment of the utility model;

[0056] Figure 19 The structure diagram of the first shell and the fan is shown in another embodiment of the utility model;

[0057] Figure 20 The structure diagram of the breathing machine hidden casing is shown in the utility model;

[0058] Figure 21 The structure diagram of the breathing machine with casing is shown in the utility model;

[0059] 1, the first shell; 2, the second shell; 3, the resistance rib group; 4-(a / b / c / d), the noise reduction mechanism; 5, the shell sealing element; 6, the fan cover; 7, the fan; 8, the fan air outlet sealing element;

[0060] 10, the air inlet noise reduction chamber; 11, the air inlet; 12, the air inlet extension rib; 20, the fan chamber; 21, the air outlet; 22, the support rib group; 31, the guide rib plate; 311, the first guide rib plate; 312, the second guide rib plate; 32, the cavity rib plate;

[0061] 41, the micropore; 42, the assembly perforation; 43, the noise reduction cavity;

[0062] 51, the sealing frame; 52, the sealing inner strip plate; 60, the ring groove; 61, the sleeve body; 62, the first buffer element; 71, the fan air inlet; 80, the air inlet pipe; 90, the laminar flow pipe; 100, the air path chamber; 110, the buffer chamber; 120, the second buffer element; 130, the differential pressure flow sensor; 140, the first pressure sensor;

[0063] 101, the first limit domain; 102, the second limit domain; 103, the third limit domain; 104, the fourth limit domain; 105, the first boundary surface; 106, the second boundary surface; 107, the first air path chamber; 108, the second air path chamber; 109, the third air path chamber; 520, the groove;

[0064] 1000, Low-noise silencing enclosure; 1100, Water tank; 1200, Adapter chamber; 1300, Second pressure sensor; 1400, Housing. Detailed Implementation

[0065] The content of this application will be further described in detail below with reference to specific embodiments:

[0066] like Figure 1 As shown, a low-noise silencing box for a ventilator includes a first housing 1, a second housing 2, a set of resistant ribs 3, and a noise reduction mechanism 4. An air inlet 11 is provided on the first housing 1, and an air outlet 21 is provided on the second housing 2; and an air inlet extension rib 12 is provided on the inner side of the air inlet 11 (inner side of the first housing 1).

[0067] The first casing 1 and the second casing 2 are divided into left and right half-casings along the radial direction of the fan. (See attached diagram) Figure 6 The mating plane is set as the second interface 106. The housing seal 5 seals and connects the first housing 1 and the second housing 2 at the second interface 106, forming the complete housing of the silencing box. The interior of the complete housing is divided into two main parts: the air intake noise reduction chamber 10 and the fan chamber 20. The separating plane between the fan chamber 20 and the air intake noise reduction chamber 10 is set as the first interface 105. The fan 7 is suspended in the fan chamber 20 by the fan sleeve 6, and the noise reduction mechanism 4 is constructed below the fan inlet. The fan 7 is installed on one side of the housing, away from the air inlet 11, to extend the air path, increase the reflection of noise during propagation, and reduce noise.

[0068] The first interface 105 and the second interface 106 intersect perpendicularly, which is equivalent to dividing the interior of the entire shell into four spatial blocks, which are described as the first confined area 101, the second confined area 102, the third confined area 103 and the fourth confined area 104 for ease of description.

[0069] The first limiting region 101 and the third limiting region 103 each correspond to half of the air intake noise reduction chamber 10, and the second limiting region 102 and the fourth limiting region 104 each correspond to half of the fan chamber 20. The housing corresponding to the first limiting region 101 and the second limiting region 102 is the second housing 2, and the housing corresponding to the third limiting region 103 and the fourth limiting region 104 is the first housing 1. A schematic diagram of the fan 7 installed in half of the fan chamber 20 is attached. Figure 4 .

[0070] The anti-reduction ribs 3 are disposed in the intake noise reduction chamber 10. In other words, anti-reduction ribs 3 are respectively disposed in the first housing 1 and the second housing 2, and the anti-reduction ribs 3 in the two housings are symmetrically arranged, cooperating with each other to form the internal air passage of the overall intake noise reduction chamber 10. That is, the intake noise reduction chamber 10 is divided into at least two connected air passage chambers 100, and the end air passage chamber 100 is connected to the fan chamber 20. The air passage chamber 100 and its airflow path are shown in the attached figure.Figure 7 The resistance rib group 3 is arranged in the first shell 1 as shown in FIG. 2.

[0071] Specifically, the resistance rib group 3 includes a pair of flow guide rib plates 31 and a pair of cavity partition rib plates 32; the pair of cavity partition rib plates 32 are used to partition the two side air path chambers 100, and the pair of flow guide rib plates 31 are installed on the pair of cavity partition rib plates 32 one by one and connect the two side air path chambers 100, and the pair of flow guide rib plates 31 are staggered and distributed between the pair of cavity partition rib plates 32, and the lengths of the pair of flow guide rib plates 31 are different, and the heights of the air path chambers 100 partitioned by the pair of flow guide rib plates 31 are different, so that the sound reduction frequencies of the chambers are staggered with each other, and the noise reduction effect is improved.

[0072] In the embodiment, the pair of flow guide rib plates 31 are arranged in parallel.

[0073] The arrangement of the resistance rib group 3 in the first shell 1 is shown in FIG. 2. Figure 2 The arrangement of the resistance rib group in the second shell is shown in FIG. 3. Figure 3 The shell sealing member 5 connects the resistance rib groups 3 in the first shell 1 and the second shell 2 in abutment, and divides the air inlet noise reduction chamber 10 into three air path chambers 100, and the structure of the corresponding shell sealing member 5 is shown in FIG. 4. Figure 7 In addition to the fan chamber 20, there are four large noise reduction chambers; the structure of the corresponding shell sealing member 5 is shown in FIG. 4. Figure 5

[0074] The shell sealing member 5 includes a sealing frame 51 and a sealing inner strip plate 52, and the arrangement form of the sealing inner strip plate 52 is the same as the layout of the resistance rib group 3 inside the first shell 1 and the second shell 2, and grooves 520 for sealing abutment with the flow guide rib plates 31 and the cavity partition rib plates 32 are arranged on both sides of the sealing inner strip plate 52.

[0075] The fan 7 is installed by matching the array of bosses on the side of the fan with the array of mounting grooves arranged on the inner wall of the fan sleeve 6 (neither the bosses nor the mounting grooves are shown in the drawings), and the fan outlet sealing member 8 is sleeved on the air outlet of the fan, and the fan outlet sealing member 8 is provided as a sleeve, and the end of the sleeve is abutted with the air outlet 21 of the second shell 2 on the side, so as to avoid the backflow of the airflow from the fan 7 into the fan chamber and cause turbulence.

[0076] A support rib group 22 for mounting the fan sleeve 6 is arranged on the inner wall of the side of the fan chamber 20, and the support rib group 22 includes at least four fan support ribs, and the schematic diagram of the fan suspended and installed on the shell sealing member 5 is shown in FIG. 5. Figure 5 The fan support ribs are adaptively connected with the ring grooves 60 arranged on the fan sleeve 6.

[0077] ​The total of eight groups of fan support ribs are provided in this embodiment, of which six groups are provided on the shell seal 5, the first shell 1 and the second shell 2 near the second boundary surface 106, and the other two groups are provided on the inner wall of the shell away from the second boundary surface 106 of the second limited area 102 and the fourth limited area 104, and the fan support ribs on the inner wall of the shell are provided in H shape or N shape, and a plurality of groups of fan support ribs of different sizes and shapes improve the support stability of the fan (cover).

[0078] The specific example of the noise reduction mechanism 4 configured below the fan is shown in the attached Figure 7 to the attached Figure 13 , including a support plate body and a bottom noise reduction rib plate body, the support plate body and the noise reduction rib plate body are integrally formed, the fan 7 is installed on the assembly perforation 42 on the support plate body, and the noise reduction mechanism is shown in the attached Figure 14 .

[0079] The specific embodiments of the noise reduction mechanism 4 are provided below.

[0080] Embodiment 1

[0081] The noise reduction mechanism 4-a is provided as a noise reduction volute, and the attached Figure 7 shows a cross-sectional example of the noise reduction volute support provided at the bottom of the fan. The flow guide ribs of the noise reduction volute rotate in the same direction as the fan 7 impeller rotation direction, and the noise reduction volute inlet cross-sectional area is 90-110% of the fan inlet cross-sectional area, with an error of not more than 10%, to avoid large pressure pulsation and noise.

[0082] The airflow entering the fan is guided and pressure-stabilized in advance to reduce the turbulence phenomenon at the fan inlet.

[0083] The volute can be provided in one of the spiral line and fan blade shapes, and different noise reduction volute forms are shown in the attached Figure 10 、 Figure 11 and the attached Figure 12 . Among them, the noise reduction volute shape in the attached Figure 10 is set as an intermittent spiral line, the noise reduction volute shape in the attached Figure 11 is set as a continuous spiral line, and the noise reduction volute shape in the attached Figure 12 is set as a fan shape.

[0084] Embodiment 2

[0085] The noise reduction mechanism 4-b is provided as a noise reduction baffle, and the same size of micro-holes 41 are arrayed on the noise reduction baffle, as shown in the attached Figure 8 , and the noise reduction baffle and the bottom of the second shell 2 leave a space to form a noise reduction cavity 43, and the sound returned from the fan inlet 71 passes through the micro-holes 41 and the noise reduction cavity below the micro-holes 41 to form a resonance system, thereby reducing noise and achieving the elimination of specific frequency noise.

[0086] Embodiment 3

[0087] The noise reduction mechanism 4-c is set as a noise reduction resistance material, referring to the attached Figure 9 , which has a large number of micro-porous structures inside, and when sound enters the resistance material, the sound energy is converted into heat energy, reducing noise energy.

[0088] Example 4

[0089] The noise reduction mechanism 4-d is set as a combination of a noise reduction volute and a noise reduction baffle, referring to the attached Figure 13 , the noise reduction volute is inserted into the noise reduction baffle, the airflow enters the bottom of the noise reduction cavity from the micro-pores on the side of the fan, and the airflow enters the fan from the micro-pores directly below the fan. The airflow passes through the noise reduction hole box and is turned by 180°, increasing the number of collisions and friction between sound and micro-pores, and improving the noise reduction effect.

[0090] In another embodiment of the present application, another structure of a low-noise silencer is also provided. The main difference from the previous embodiment is the arrangement of the shell and the fan.

[0091] In this embodiment, as shown in the attached Figure 15 , the first shell 1 and the second shell 2 are distributed along the motor shaft of the fan 7. It can be understood that in the previous embodiment, the first shell 1 and the second shell 2 are connected horizontally, while in this embodiment, the first shell 1 and the second shell 2 are connected vertically.

[0092] As shown in the attached Figures 16 to 17 , the guide rib plate 31 includes a first guide rib plate 311 and a second guide rib plate 312, and the air path chamber 100 includes a first air path chamber 107, a second air path chamber 108, and a third air path chamber 109 connected in sequence. The first shell 11 is provided with an air inlet 11 communicating with the first air path chamber 107, the pair of first guide rib plates 311 communicate the first air path chamber 107 and the second air path chamber 108, and the pair of second guide rib plates 312 communicate the second air path chamber 108 and the third air path chamber 109.

[0093] As shown in the attached Figures 16 to 17 , the low-noise silencer further includes an air inlet pipe 80, which is arranged in the first air path chamber 107 and communicates with the air inlet 11. The air inlet pipe 80 is curved towards the top of the first air path chamber 107. It can be understood that in the specific arrangement, the air inlet pipe 80 is curved upwards.

[0094] In this embodiment, air enters through the air inlet pipe 80, and air enters at the same time through the fan 7. The pressurized air flows to the top of the first air path chamber 107 under the action of the air inlet pipe 80, so that the fluid blows to the side wall of the cavity with an extended distance and provides a buffer, preventing the generation of regenerative noise caused by direct wall collision of the gas.

[0095] Further, the flow rate of the gas along the height direction of the low-noise muffler is slightly different in the process of touching the top of the first air path chamber 107, so that the gas is more stable when passing through the first flow guide channel composed of the two first flow guide ribs 311. The first air path chamber 107 is far away from the fan 7 in the gas channel, and the flow rate is slow, but the influence on the positive pressure of the air channel provided by the fan 7 is small, and the power consumption is less increased. At the same time, due to the slow flow rate, the turbulent flow noise is small. Similarly, the second air path chamber 108 is the same as the first air path chamber 107. After the gas passes through the first flow guide channel, it will first touch the side wall near the second flow guide rib 312, and then touch the side wall near the first flow guide rib 311 due to the long length of the second flow guide rib 312. After that, the gas enters the third air path chamber 109 through the second flow guide channel formed by the two second flow guide ribs 312. The above-mentioned setting also increases the power consumption to a certain extent, but the increased power consumption is less, and the noise is relatively small due to the relatively slow flow rate.

[0096] Further, as shown in the accompanying drawings, Figures 16 to 17 The pair of flow guide ribs 31 is in the shape of an expanding opening along the air inlet direction. That is, the pair of first flow guide rib 311 and second flow guide rib 312 are both in the shape of an expanding opening. In the accompanying drawings, Figure 17 The air inlet direction is the horizontal left direction. By adopting the expanding opening design, the air resistance can be reduced, and the load and power consumption of the fan 7 can be reduced.

[0097] Further, as shown in the accompanying drawings, Figures 16 to 18 The low-noise muffler further comprises a laminar flow pipe 90, which communicates the third air path chamber 109 and the fan chamber 20. By arranging the laminar flow pipe 90, the gas flows into the fan chamber 20 from the third air path chamber 109 in the form of laminar flow, reducing the degree of turbulent flow of the gas, thereby reducing the noise.

[0098] Further, as shown in the accompanying drawings, Figure 17 The length of the second air path chamber 108 along the air inlet direction is L, the length of the first flow guide rib 311 is L / 4, and the length of the second flow guide rib 312 is L / 2. By the above-mentioned arrangement, the noise sound wave suddenly expands in the cross section, causing the acoustic impedance to change abruptly, changing the propagation direction of the sound wave, and the frequency band of the sound absorbing is wider.

[0099] Further, the gas outlet end of the terminal air path chamber 100 is located at the end away from the fan air outlet. That is, the gas outlet end of the third air path chamber 109 is located at the end away from the fan air outlet. The gas is pre-rotated in the fan chamber 20 and moves along the rotation direction of the fan 7 until it is sucked into the fan 7. By the above-mentioned arrangement, when the gas flows from the third air path chamber 109 into the fan chamber 20, the flow direction is consistent with the rotation direction of the fan 7, thereby reducing the power consumption and noise.

[0100] As shown in the accompanying drawings, Figures 16 to 18 The fan cover 6 comprises a cover body 61 and a first buffer 62. The first buffer 62 is a plurality of first buffers 62 which are arranged on the outer circumferential wall of the cover body 61 in a circumferential direction, and each first buffer 62 is detachably connected to the inner wall of the fan chamber 20. That is, each first buffer 62 extends outwardly from the outer circumferential wall of the cover body 61 and is connected and fixed to the inner wall of the fan chamber 20, so that the fan 7 is suspended in the fan chamber 20. The above arrangement does not occupy the internal space of the fluid, has a compact structure, and can buffer the fan 7, thereby reducing the vibration noise generated by the operation of the fan 7.

[0101] Further, as shown in the accompanying drawings, Figures 16 to 17 The low-noise sound-absorbing box further comprises a second buffer 120 which communicates the fan air outlet and the buffer chamber 110. The second buffer 120 can also buffer the fan 7, thereby reducing the vibration noise generated by the operation of the fan 7.

[0102] Further, as shown in the accompanying drawings, Figures 16 to 17 The low-noise sound-absorbing box further comprises a second buffer 120 which communicates the fan air outlet and the buffer chamber 110. The second buffer 120 can also buffer the fan 7, thereby reducing the vibration noise generated by the operation of the fan 7.

[0103] Specifically, the first buffer 62 and the second buffer 120 are both made of silica gel, thereby having a better buffering effect.

[0104] Since the main noise source is the operation of the fan 7, part of the noise generated by the fan 7 is incident on the wall surface of the shell and is absorbed and projected, and most of the noise propagates along the gas flow path and is finally transmitted from the air inlet 11. The noise of the fan air outlet is reduced by the buffer chamber 110, and the noise of the fan air inlet is reduced by the laminar flow pipe 90, the second flow guide rib plate 312 and the first flow guide rib plate 311.

[0105] Further, as shown in the accompanying drawings, Figures 20 to 21As shown, the low-noise silencer further comprises a differential pressure flow sensor 130. In order to achieve the required identification accuracy, the probe head of the differential pressure flow sensor 130 needs to be located at two places with a certain pressure difference. In the present application, the pressure difference between the first air path chamber 107 and the fan chamber 20 is the largest. Therefore, the probe head of the differential pressure flow sensor 130 is arranged in the first air path chamber 107 and the fan chamber 20 respectively, so that the air resistance of the entire air path and the power consumption of the fan are smaller, and the structure is simple. By arranging the differential pressure flow sensor 130, the flow of the gas entering the human body from the breathing machine can be accurately measured, so that accurate flow adjustment can be performed according to the actual needs.

[0106] In another embodiment of the present application, as shown in the accompanying drawings Figure 19 As shown, the resistance rib group comprises a flow guide rib plate 31 and a partition rib plate 32. The flow guide rib plate 31 and the partition rib plate 32 are both multiple. Each partition rib plate 32 is used to separate the air path chambers on both sides. Each flow guide rib plate 31 is installed on each partition rib plate 32 one by one. The flow guide rib plates 31 are staggered between each other and form a flow guide channel.

[0107] That is, the flow guide rib plate 31 and the partition rib plate 32 in this embodiment are single. Specifically, the flow guide rib plate 31 comprises a first flow guide rib plate 311 and a second flow guide rib plate 312. The partition rib plate 32 is two. The first flow guide rib plate 311 and the second flow guide rib plate 312 are connected with the two partition rib plates 32 respectively and are L-shaped. They are located on the upper and lower sides of the air path chamber 100 respectively and are staggered in the horizontal direction. The flow guide channel is formed between the first flow guide rib plate 311 and the second flow guide rib plate 312. Through the above arrangement, the structure of the air path chamber 100 can be more compact, so that the flow guide channel is not too narrow, and the length of the second air path chamber 108 is not too short. After the gas is accelerated, it has enough time to buffer, so that it collides with the inner wall of the chamber at high speed and generates regenerative noise.

[0108] Further, as shown in the accompanying drawings Figures 20 to 21 As shown, the low-noise silencer further comprises a first pressure sensor 140. The probe head of the first pressure sensor 140 is arranged in the buffer chamber 110 and is used to monitor the pressure information.

[0109] The following table shows the noise detection results of the low-noise silencer of the present application.

[0110] Table 1-Noise detection condition table of low-noise silencer

[0111]

[0112] Table 2-Noise detection result table (1) of low-noise silencer

[0113]

[0114] Table 3-Noise detection result table (2) of low-noise silencer

[0115]

[0116] As can be calculated from the table above, the A-meter average sound pressure level Lp of the low-noise anechoic chamber of this application is 23.49 dBA (SPL), and the A-meter sound power level Lw is 31.7 dB (PWL). It can be seen that the low-noise anechoic chamber of this application has a good noise reduction and sound attenuation effect.

[0117] As attached Figures 20 to 21 As shown, this application also provides a ventilator, including a transfer chamber 1200, a water tank 1100 and the aforementioned low-noise silencing box 1000. The water tank 1100 is connected to both the low-noise silencing box 1000 and the transfer chamber 1200. The transfer chamber 1200 is used to connect to the patient end by heating the breathing tubing and the patient interface.

[0118] Further details are attached. Figures 20 to 21 As shown, the ventilator also includes a second pressure sensor 1300. The probe of the second pressure sensor 1300 is disposed in a receiving chamber located on the outer wall of a low-noise anechoic chamber, and the receiving chamber is connected to the transfer chamber 1200, thereby enabling the second pressure sensor 1300 to detect the pressure in the transfer chamber 1200. Alternatively, the probe of the second pressure sensor 1300 can be directly disposed within the transfer chamber 1200, depending on actual needs. With this configuration, the second pressure sensor 1300 is close to the patient, thus enabling accurate monitoring of pressure information. Furthermore, disposing the probe of the first pressure sensor 140 within the buffer chamber 110 prevents it from being affected by humidifying gas, reducing its susceptibility to damage and preventing single-sensor failure from causing a single malfunction.

[0119] Further details are attached. Figures 20 to 21 As shown, the ventilator also includes a housing 1400, a water tank 1100 which is detachably connected to the housing 1400, and a position detection sensor is provided at the connection between the housing 1400 and the water tank 1100 to detect whether the water tank 1100 and the housing 1400 are properly connected.

[0120] Specifically, the position detection sensor can be a micro switch, and the installation position of the position detection sensor is not limited, as long as it is at the connection position of the water tank 1100 and the shell 1400, for example, on the inner side wall of the shell 1400 corresponding to the water tank 1100, further, the position detection sensor is located at the lower end of the inner side wall, away from the air inlet and outlet, to avoid damage to the sensor by the humidified gas. The breathing machine further comprises an indicator light and a PCBA board, and the micro switch is electrically connected with the indicator light and the PCBA board respectively. When the water tank 1100 and the shell 1400 are connected in place, the indicator light will light up, and through circuit control, the indicator light will be turned off after a certain period of time, thereby avoiding light pollution; if the water tank 1100 and the shell 1400 are not connected in place, the indicator light will not light up, and the user needs to check the breathing machine to solve the problem.

[0121] The above embodiments are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. For those skilled in the art, it is obvious that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present application, therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.

Claims

1. A low noise sound attenuation box for a breathing machine, characterized by, The low-noise sound-absorbing box comprises a first shell, a second shell, a resistance rib group and a noise reduction mechanism; the first shell and the second shell are connected by a shell sealing piece to form an integrated shell, and an air inlet noise reduction chamber and a fan chamber are arranged in the integrated shell; The first shell and the second shell are distributed along the radial direction or the axial direction of the motor of the fan. The resistance rib group is arranged in the air inlet noise reduction chamber and divides the air inlet noise reduction chamber into at least two air path chambers in communication; the air path chamber at the end is in communication with the fan chamber; the fan is suspended in the fan chamber through a fan cover, and the noise reduction mechanism is arranged below the air inlet of the fan.

2. The low noise sound attenuation box for a breathing machine of claim 1, wherein, The resistance rib group is arranged in each of the first shell and the second shell, and the resistance rib groups in the two shells are symmetrically arranged. The resistance rib group comprises a pair of guide rib plates and a pair of cavity separation rib plates; the pair of cavity separation rib plates are used for separating the air path chambers on both sides, and the pair of guide rib plates are installed on the pair of cavity separation rib plates one by one and are in communication with the air path chambers on both sides, and the pair of guide rib plates are staggered.

3. The low noise sound attenuation box for a breathing machine of claim 2, wherein, The noise reduction mechanism adopts one or more combinations of a noise reduction volute, a noise reduction baffle and a noise reduction resistance material block.

4. The low noise sound attenuation box for a ventilator of claim 3, wherein, The noise reduction mechanism is arranged as a noise reduction volute, the rotation direction of the guide rib of the noise reduction volute is consistent with the rotation direction of the fan impeller, and the ratio of the air inlet cross-sectional area of the noise reduction volute to the air inlet cross-sectional area of the fan is 90-110%. The cross-sectional shape of the noise reduction volute is arranged as a fan shape or a vortex line shape.

5. The low noise sound attenuation box for a breathing machine of claim 3, wherein, The noise reduction mechanism is arranged as a noise reduction baffle, a plurality of micropores are arranged on the noise reduction baffle, and a space is arranged at the bottom of the noise reduction baffle to form a noise reduction chamber.

6. The low noise sound attenuation box for a breathing machine of claim 2, wherein, The pair of guide rib plates are arranged in parallel or in a flared shape along the air inlet direction.

7. The low noise sound attenuation case for a ventilator of claim 2, wherein, The guide rib plate comprises a first guide rib plate and a second guide rib plate, the air path chamber comprises a first air path chamber, a second air path chamber and a third air path chamber in sequence, an air inlet is arranged on the first shell and is in communication with the first air path chamber, the pair of first guide rib plates are in communication with the first air path chamber and the second air path chamber, and the pair of second guide rib plates are in communication with the second air path chamber and the third air path chamber.

8. The low noise sound attenuation case for a ventilator of claim 7, wherein, The low-noise sound-absorbing box further comprises an air inlet pipe, the air inlet pipe is arranged in the first air path chamber and is in communication with the air inlet, and the air inlet pipe is arranged in a bent shape towards the top of the first air path chamber.

9. The low noise sound attenuation case for a ventilator of claim 7, wherein, The low-noise sound-absorbing box further comprises a laminar flow pipe, the laminar flow pipe is in communication with the third air path chamber and the fan chamber.

10. The low noise sound attenuation case for a ventilator of claim 7, wherein, The length of the second air path chamber along the air inlet direction is L, the length of the first guide rib plate is L / 4, and the length of the second guide rib plate is L / 2.

11. The low noise sound attenuation case for a ventilator of claim 7, wherein, The low-noise sound-absorbing box further comprises a differential pressure flow sensor, and the detection heads of the differential pressure flow sensor are arranged in the first air path chamber and the fan chamber respectively.

12. The low noise sound attenuation case for a ventilator of claim 1, wherein, The air outlet end of the air path chamber at the end is located at the end away from the air outlet of the fan.

13. The low noise sound attenuation case for a ventilator of claim 1, wherein, The resistance rib group is arranged in each of the first shell and the second shell, and the resistance rib groups in the two shells are symmetrically arranged. The resistance rib group comprises flow guide ribs and cavity separating ribs; the flow guide ribs and the cavity separating ribs are both in plurality, each of the cavity separating ribs is used for separating the air path chambers on two sides, each of the flow guide ribs is installed on each of the cavity separating ribs one by one, and the flow guide ribs are staggered and distributed between each other and form flow guide channels.

14. The low noise sound attenuation case for a ventilator of claim 1, wherein, The first interface between the fan chamber and the air inlet noise reduction chamber and the second interface between the first shell and the second shell are perpendicular to each other.

15. The low noise sound attenuation case for a ventilator of claim 2, wherein, The shell seal comprises a sealing frame and a sealing inner strip plate, the arrangement form of the sealing inner strip plate is the same as the layout of the resistance rib group inside the first shell and the second shell, and grooves sealingly connected with the flow guide ribs and the cavity separating ribs are arranged on both sides of the sealing inner strip plate.

16. The low noise sound attenuation case for a ventilator of claim 1, wherein, A support rib group for mounting the fan cover is arranged on the inner wall of the fan chamber; the support rib group comprises at least four fan support ribs, and the fan support ribs are adaptively connected with the ring groove arranged on the fan cover.

17. The low noise sound attenuation case for a ventilator of claim 1, wherein, The fan cover comprises a cover body and first buffer members, the first buffer members are in plurality, the plurality of first buffer members are arranged on the outer peripheral wall of the cover body in a circumferential direction, and each of the first buffer members is detachably connected with the inner wall of the fan chamber.

18. The low noise sound attenuation case for a ventilator of claim 1, wherein, The whole box shell further has a buffer chamber, the buffer chamber is in communication with the fan chamber and corresponds to the fan air outlet.

19. The low noise sound attenuation case for a ventilator of claim 18, wherein, The low-noise sound-absorbing box further comprises a second buffer member, the second buffer member is in communication with the fan air outlet and the buffer chamber.

20. The low noise sound attenuation case for a ventilator of claim 18, wherein, The low-noise sound-absorbing box further comprises a first pressure sensor, a detection head of the first pressure sensor is arranged in the buffer chamber.

21. A breathing machine, characterized by, The breathing machine comprises an adapter chamber, a water tank and the low-noise sound-absorbing box of any one of claims 1 to 20, the water tank is in communication with the low-noise sound-absorbing box and the adapter chamber respectively, and the adapter chamber is used for being in communication with a patient end.

22. The ventilator of claim 21, wherein, The breathing machine further comprises a second pressure sensor, wherein, a detection head of the second pressure sensor is arranged in the adapter chamber; or The low-noise sound-absorbing box further comprises a containing chamber, a detection head of the second pressure sensor is arranged in the containing chamber, and the containing chamber is in communication with the adapter chamber.

23. The ventilator of claim 21, wherein, The breathing machine further comprises a machine shell, the water tank is detachably connected with the machine shell, and a position detection sensor is arranged at the connection position of the machine shell and the water tank, and is used for detecting whether the water tank and the machine shell are connected in place.

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