CN220791607U

CN220791607U - A low noise amortization case for breathing machine

Info

Publication number: CN220791607U
Application number: CN202322744089.XU
Authority: CN
Inventors: 于虎振; 刘超
Original assignee: Shandong Qifu Health Technology Co ltd
Current assignee: Shandong Qifu Health Technology Co ltd
Priority date: 2023-10-12
Filing date: 2023-10-12
Publication date: 2024-04-16
Anticipated expiration: 2033-10-12

Abstract

The utility model relates to the technical field of medical equipment, in particular to a low-noise silencing box for a breathing machine, which comprises a first shell, a second shell, a shell sealing piece, a resistance rib group and a noise reduction mechanism, wherein the first shell is provided with a first opening; 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 passage cavities; the air path chamber at the tail end is communicated with the fan chamber; the noise reduction mechanism is arranged below the air inlet of the fan. According to the utility model, the first shell and the second shell which are arranged along the radial direction of the fan are respectively provided with the resistance rib groups, and the independently arranged air inlet noise reduction cavity is divided into the plurality of air channel cavities, so that the fan is arranged at one side far away from the air inlet, the air channel is prolonged, the reflection times during noise transmission are increased, and the noise is reduced; the noise reduction mechanism arranged at the bottom of the air inlet of the fan is used for further reducing noise, stabilizing current and stabilizing voltage, and improving the noise reduction effect.

Description

A low noise amortization case for breathing machine

Technical Field

The utility model relates to the technical field of medical appliances, in particular to a low-noise sound-reducing box for a breathing machine.

Background

Patients with obstructive sleep apnea and chronic obstructive pulmonary disease need to be treated with ventilators for assistance, and during the treatment, the patient is in a sleep state most of the time, requiring a quiet and comfortable surrounding environment. However, the ventilator pressurizes the air in the pipeline by the fan, thereby having therapeutic effect on the patient. The fan inevitably generates noise in the working process, and the sleeping of the patient is affected.

The prior art mainly achieves the purpose of reducing fan noise by improving the installation and fixation modes of the fan, and mainly reduces pneumatic noise by designing an internal gas flow path of the breathing machine and reduces noise by arranging a silencing and sound absorbing material.

Although the above solutions have achieved a certain effect, the following problems still remain:

In order to realize that the fan is fixed, the structure of the common fixing device is complex, the volume of the breathing machine is directly increased, the breathing machine is limited by space and position, and the breathing machine is inconvenient to move and transport. In order to optimize the design of the air path, the internal structure of the fan box is complex, so that the internal air resistance of the breathing machine is greatly increased, the running load of the fan is increased, and the equipment loss is accelerated; and the long-term use of the silencing and sound-absorbing materials can generate toxic gas, so that the toxic gas can form larger use harm to patients.

Accordingly, the present utility model provides a low noise muffler for a ventilator to solve the problems of the prior art.

Disclosure of utility model

The utility model aims at: the utility model provides a low noise amortization case for breathing machine to produce noise in the breathing machine equipment operation in-process and influence the technical problem that patient used experience among the prior art.

The technical scheme of the utility model is as follows: a low noise silencing box for a breathing machine 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 in a sealing way through a shell sealing piece to form a whole box shell, and an air inlet noise reduction cavity and a fan cavity are formed in the whole box shell;

wherein the first shell and the second shell are distributed along the radial direction of the motor of the fan;

The resistance rib group is arranged in the air inlet noise reduction cavity and divides the air inlet noise reduction cavity into at least two communicated air passage cavities; the air path chamber at the tail end is communicated with the fan chamber; the fan is suspended in the fan cavity through the fan sleeve, and the noise reduction mechanism is constructed below the fan air inlet.

Preferably, the first shell and the second shell are respectively provided with the resistance rib groups, and the resistance rib groups in the two shells are symmetrically arranged;

The resistance rib group comprises a pair of flow guide rib plates and a pair of separation cavity rib plates; the paired separation cavity rib plates are used for separating the air channel cavities at two sides, the paired diversion rib plates are arranged on the paired separation cavity rib plates one by one and communicate the air channel cavities at two sides, and the paired diversion rib plates are distributed in a staggered manner.

Preferably, the noise reduction mechanism adopts one or more of a noise reduction volute, a noise reduction baffle and a noise reduction resistive material block.

Preferably, the noise reduction mechanism is a noise reduction volute, the rotation direction of a flow guide rib of the noise reduction volute is consistent with the rotation direction of the fan impeller, and the ratio of the air inlet sectional area of the noise reduction volute to the air inlet sectional area of the fan is 90-110%;

the cross section of the noise reduction volute is in a fan blade shape or a vortex-like line shape.

Preferably, the noise reduction mechanism is a noise reduction partition board, micropores are arrayed on the noise reduction partition board, and a space is formed at the bottom of the noise reduction partition board to form a noise reduction cavity.

Preferably, a first interface of the fan chamber and the air inlet noise reduction chamber is perpendicular to a second interface of the first shell and the second shell in butt joint.

Preferably, the shell sealing member comprises a sealing frame and a sealing inner ribbon board, the arrangement form of the sealing inner ribbon board is the same as the arrangement form of the resistance rib group in the first shell and the second shell, and grooves in sealing butt joint with the flow guide rib board and the separation cavity rib board are formed in two sides of the sealing inner ribbon board.

Preferably, a supporting rib group for installing the blower sleeve is arranged on the inner wall of the periphery side of the blower chamber; the support rib group comprises at least four fan support ribs, and the fan support ribs are connected with the annular grooves arranged on the fan sleeve in an adaptive manner.

Compared with the prior art, the utility model has the advantages that:

(1) The sound-reducing box is divided into the first shell and the second shell, the first shell and the second shell are distributed along the radial direction of the fan, a half of fan cavity and a half of noise-reducing runner cavity are arranged in the first shell and the second shell, and the shell separation line and the cavity separation line are vertically intersected, so that the fan is arranged on one side far from the air inlet, the air path is prolonged, the reflection times during noise transmission are increased, and the noise is reduced. And the noise reduction mechanism is arranged at the bottom of the air inlet of the fan, and the noise reduction mechanism and the noise reduction runner chamber are in impedance type composite noise reduction, so that the noise reduction effect is improved.

(2) The runner chamber is internally provided with a plurality of groups of resistance ribs, the runner chamber is divided into a plurality of small chambers, the small chambers are different in size and are distributed in a staggered manner, the multiple chambers are designed in a staggered manner, the gas path and noise reflection times are prolonged, and the noise reduction effect is improved.

(3) The noise reduction mechanism adopts one or a combination of a plurality of noise reduction spiral case, noise reduction baffle plates and noise reduction resistive material blocks, wherein the cross section shape of the noise reduction spiral case is set to be in a fan blade wheel shape or a vortex-like line shape, the rotation direction of a rib plate of the noise reduction spiral case is consistent with that of an impeller of a fan, the air inlet cross section area of the noise reduction spiral case is equivalent to that of an air inlet of the fan, the air flow entering the fan is guided and stabilized in advance, and the turbulence phenomenon at the air inlet of the fan is reduced.

(4) And a plurality of groups of supporting rib groups are arranged on the periphery of the fan cavity and the shell sealing piece to install a fan sleeve, and the fan is suspended by flexible wrapping of the fan sleeve, so that the fan installation stability is improved, and the damping and noise reduction effects are achieved.

Drawings

The utility model is further described below with reference to the accompanying drawings and examples:

FIG. 1 is an exploded pictorial view of a low noise sound muffler of the present utility model;

FIG. 2 is a schematic view of the structure of the first housing according to the present utility model;

FIG. 3 is a schematic view of the structure of the second housing according to the present utility model;

FIG. 4 is a schematic view of a fan according to the present utility model mounted on a second housing;

FIG. 5 is a schematic perspective view of a blower according to the present utility model mounted to a housing seal member;

fig. 6 is a schematic view of the overall appearance and the perspective structure of the low-noise sound-reducing box according to the present utility model;

FIG. 7 is a cross-sectional view of a first embodiment of a noise reduction mechanism in a low noise attenuation tank in accordance with the present utility model;

FIG. 8 is a cross-sectional view of a second embodiment of a noise reduction mechanism in a low noise attenuation tank in accordance with the present utility model;

FIG. 9 is a cross-sectional view of a third embodiment of a noise reduction mechanism in a low noise attenuation tank in accordance with the present utility model;

FIG. 10 is a diagram showing an intermittent spiral example of a noise reduction volute in accordance with a first embodiment of the noise reduction mechanism of the present utility model;

FIG. 11 is a continuous spiral exemplary view of a noise reduction volute in accordance with a first embodiment of the noise reduction mechanism of the present utility model;

FIG. 12 is a view showing an example of a curved blade shape of a noise reduction volute in accordance with a first embodiment of the noise reduction mechanism of the present utility model;

FIG. 13 is an exemplary view of the noise reduction of the assembled combination of the noise reduction mechanism of the present utility model;

FIG. 14 is a top plan view of the noise reduction mechanism of the present utility model;

wherein: 1. a first housing; 2. a second housing; 3. a set of resistant tendons; 4- (a/b/c/d), a noise reduction mechanism; 5. a housing seal; 6. a blower cover; 7. a blower; 8. an air outlet sealing piece of the fan;

10. An air intake noise reduction chamber; 11. an air inlet; 12. an air inlet extension rib; 20. a fan chamber; 21. an air outlet; 22. a support rib group; 31. a diversion rib plate; 32. a rib plate of the separation cavity;

41. micropores; 42. assembling the perforation; 43. a noise reduction cavity;

51. Sealing the frame; 52. sealing the inner lath; 60. a ring groove; 71. an air inlet of the fan; 100. a gas path chamber;

101. A first confinement; 102. a second confinement; 103. a third confinement; 104. a fourth confinement; 105. a first interface; 106. a second split interface; 520. a groove.

Detailed Description

The following describes the present utility model in further detail with reference to specific examples:

As shown in fig. 1, a low noise attenuation box for a ventilator includes a first housing 1, a second housing 2, a resistance rib group 3, and a noise reduction mechanism 4. The air inlet 11 is arranged on the first shell 1, and the air outlet 21 is arranged on the second shell 2; and an intake extension rib 12 is provided on the inner side of the intake port 11 (inside the first housing 1).

The first casing 1 and the second casing 2 are divided into a left casing half and a right casing half along the radial direction of the fan, referring to fig. 6, a butt joint plane is set as a second sub-interface 106, and the casing sealing member 5 is used for sealing and connecting the first casing 1 and the second casing 2 at the second sub-interface 106 to form a whole casing of the sound-reducing box. The whole box shell is internally provided with two parts of an air inlet noise reduction cavity 10 and a fan cavity 20, and the separation plane of the fan cavity 20 and the air inlet noise reduction cavity 10 is provided with a first interface 105. The fan 7 is suspended in the fan chamber 20 through the fan housing 6, and the noise reduction mechanism 4 is configured below the fan air inlet. The fan 7 is installed on one side of the box body, is far away from the air inlet 11, prolongs an air path, increases reflection during noise transmission, and reduces noise.

The first interface 105 and the second interface 106 intersect vertically, which is equivalent to dividing the interior of the whole case into four spatial blocks, which are described as a first confinement 101, a second confinement 102, a third confinement 103, and a fourth confinement 104 for convenience of description.

The first limiting area 101 and the third limiting area 103 respectively correspond to half of the air inlet noise reduction cavity 10, the second limiting area 102 and the fourth limiting area 104 respectively correspond to half of the fan cavity 20, the shell corresponding to the first limiting area 101 and the second limiting area 102 is the second shell 2, the shell corresponding to the third limiting area 103 and the fourth limiting area 104 is the first shell 1, and the fan 7 is installed in the half of the fan cavity 20, and the schematic diagram refers to fig. 4.

The resistance rib groups 3 are disposed in the air intake noise reduction chamber 10, in other words, the resistance rib groups 3 are disposed in the first casing 1 and the second casing 2 respectively, and the resistance rib groups 3 in the two casings are symmetrically disposed in an arrangement manner, and cooperate with each other to form an internal air passage of the overall air intake noise reduction chamber 10, that is, the air intake noise reduction chamber 10 is divided into at least two communicated air passage chambers 100, and the end air passage chambers 100 are communicated with the fan chamber 20. The gas circuit chamber 100 and its gas flow path are shown with reference to fig. 7.

Specifically, the resistance rib group 3 includes a pair of diversion ribs 31 and a pair of compartment ribs 32; the paired separation cavity rib plates 32 are used for separating the air channel cavities 100 at two sides, the paired diversion rib plates 31 are arranged on the paired separation cavity rib plates 32 one by one and are communicated with the air channel cavities 100 at two sides, the paired diversion rib plates 31 are distributed in a staggered manner, the lengths are different, the heights of the separated air channel cavities 100 are different, the silencing frequencies of the cavities are staggered, and the noise reduction effect is improved.

The arrangement of the resistance rib groups 3 in the first shell 1 refers to fig. 2, the arrangement of the resistance rib groups in the second shell refers to fig. 3, the shell sealing piece 5 connects the resistance rib groups 3 in the first shell 1 and the second shell 2 in a butt joint way, the air inlet noise reduction cavity 10 is divided into three air path cavities 100, and referring to fig. 7, the fan cavity 20 is added, and the four cavities are large noise reduction cavities; the structure of the corresponding housing seal 5 is shown in fig. 5.

The shell sealing member 5 comprises a sealing frame 51 and a sealing inner ribbon board 52, the arrangement form of the sealing inner ribbon board 52 is the same as the arrangement of the resistance rib group 3 in the first shell 1 and the second shell 2, and grooves 520 in sealing butt joint with the diversion rib board 31 and the separation rib board 32 are arranged on two sides of the sealing inner ribbon board 52.

The fan 7 is installed through the cooperation of the boss of array on fan week side and the mounting groove cooperation of array setting on fan cover 6 inner wall (boss and mounting groove are not all shown in the figure), and the cover fan air-out sealing member 8 on the air outlet of fan, fan air-out sealing member 8 set up to the sleeve, sleeve tip week side offsets with the gas outlet 21 of second casing 2, avoids flowing out from the fan 7 the air current backward flow back to the fan cavity and causes the turbulent flow. The blower housing 6 and the blower air outlet sealing member 8 are both made of flexible materials, such as silica gel, so that flexible wrapping and hanging of the blower 7 are realized, and cushioning and noise reduction are realized.

The inner wall of the periphery of the fan chamber 20 is provided with a supporting rib group 22 for installing the fan sleeve 6, the supporting rib group 22 comprises at least four fan supporting ribs, and the fan supporting ribs are connected with a ring groove 60 arranged on the fan sleeve 6 in an adaptive manner by referring to a schematic diagram of hanging the fan on the shell sealing piece 5 shown in fig. 5.

In this embodiment, eight groups of fan supporting ribs are provided in total, wherein six groups of fan supporting ribs are arranged on the shell sealing member 5, the first shell 1 and the second shell 2 near the second sub-interface 106, two other groups of fan supporting ribs are arranged on the inner wall of the shell, which is far away from the second sub-interface 106, of the second limiting region 102 and the fourth limiting region 104, the fan supporting ribs on the inner wall of the shell are arranged in an H shape or an N shape, multiple groups of fan supporting ribs with different sizes and different shapes are provided, and the supporting stability of the fan (sleeve) is improved.

Specific exemplary diagrams of the noise reduction mechanism 4 configured below the fan refer to fig. 7 to 13, and the noise reduction mechanism comprises a support plate body and a noise reduction rib plate body at the bottom, wherein the support plate body and the noise reduction rib plate body are integrally formed, the fan 7 is installed on an assembly perforation 42 on the support plate body, and a top view of the noise reduction mechanism refers to fig. 14.

Specific embodiments of the noise reduction mechanism 4 are provided below.

Example 1

The noise reduction mechanism 4-a is configured as a noise reduction volute, and an exemplary cross-sectional view of the noise reduction volute support disposed at the bottom of the blower is shown in fig. 7. The rotation direction of the flow guide rib of the noise reduction volute is consistent with the rotation direction of the impeller of the fan 7, the ratio of the air inlet sectional area of the noise reduction volute to the air inlet sectional area of the fan is 90-110%, the error is not more than 10%, and the noise caused by larger pressure pulsation is avoided.

The air flow entering the fan is guided and stabilized in advance, so that the turbulence phenomenon at the air inlet of the fan is reduced.

The volute may be configured as one of a scroll-like line and a fan blade, with different noise reduction volute forms as shown in fig. 10, 11 and 12. The shape of the noise reduction volute in fig. 10 is a discontinuous vortex line, the shape of the noise reduction volute in fig. 11 is a continuous vortex line, and the shape of the noise reduction volute in fig. 12 is a fan blade shape.

Example 2

The noise reduction mechanism 4-b is arranged as a noise reduction baffle, micropores 41 with the same size are arranged on the noise reduction baffle in an array mode, referring to fig. 8, a space is reserved between the noise reduction baffle and the bottom of the second shell 2 to form a noise reduction cavity 43, sound returned from the air inlet 71 of the fan forms a resonance system with the noise reduction cavity below the micropores 41 through the micropores 41, noise is reduced, and specific frequency noise is eliminated.

Example 3

The noise reduction mechanism 4-c is configured as a noise reduction resistive material, and referring to fig. 9, the interior of the noise reduction mechanism has a large number of resistive materials with micropore structures, and sound enters the resistive material to convert sound energy into heat energy, so that noise energy is reduced.

Example 4

The noise reduction mechanism 4-d is a combination of a noise reduction volute and a noise reduction baffle, and referring to fig. 13, the noise reduction volute is inserted on the noise reduction baffle, air flow enters a noise reduction cavity at the bottom from micropores at the periphery of the fan, air flow enters the fan from micropores right below the fan, the air flow passes through a noise reduction hole box to reduce noise and turn 180 degrees, the collision friction times of sound, micropores and a plate body are increased, and the noise reduction effect is improved.

The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same according to the content of the present utility model, and are not intended to limit the scope of the present utility model. It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments and that the present utility model may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore desired that the present utility model be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A low noise sound-reducing box for a breathing machine is characterized by comprising a first shell, a second shell, a resistance rib group and a noise-reducing mechanism; the first shell and the second shell are connected in a sealing way through a shell sealing piece to form a whole box shell, and an air inlet noise reduction cavity and a fan cavity are formed in the whole box shell;

2. A low noise sound reducing box for a ventilator according to claim 1, wherein the resistance rib groups are provided in the first and second housings, respectively, and the resistance rib groups in both housings are symmetrically provided;

3. The low noise sound reduction box for a respirator of claim 2, wherein the noise reduction mechanism employs a combination of one or more of a noise reduction volute, a noise reduction baffle, and a noise reduction block of resistive material.

4. A low noise sound reduction box for a ventilator according to claim 3, wherein the noise reduction mechanism is a noise reduction volute, the rotation direction of a flow guide rib of the noise reduction volute is consistent with the rotation direction of a fan impeller, and the ratio of the air inlet cross section area of the noise reduction volute to the air inlet cross section area of the fan is 90-110%;

5. A low noise sound reducing enclosure for a ventilator according to claim 3, wherein the noise reducing mechanism is configured as a noise reducing partition plate, micropores are arrayed on the noise reducing partition plate, and a space is provided at the bottom of the noise reducing partition plate to form a noise reducing cavity.

6. The low noise sound reduction box for a ventilator of claim 1, wherein a first interface of the blower chamber and the air intake noise reduction chamber and a second interface of the first housing and the second housing interface intersect perpendicularly.

7. The low noise sound reduction box for a breathing machine according to claim 2, wherein the housing seal member includes a seal rim and a seal inner strip, the arrangement of the seal inner strip is identical to the arrangement of the resistance rib group in the first housing and the second housing, and grooves in sealing butt joint with the flow guiding rib plate and the partition rib plate are provided on both sides of the seal inner strip.

8. The low noise sound reducing box for a ventilator according to claim 1, wherein a support rib group for mounting the ventilator cover is provided on a peripheral side inner wall of the blower chamber; the support rib group comprises at least four fan support ribs, and the fan support ribs are connected with the annular grooves arranged on the fan sleeve in an adaptive manner.