CN113417828A

CN113417828A - Pneumatic noise elimination device

Info

Publication number: CN113417828A
Application number: CN202110675383.2A
Authority: CN
Inventors: 赵荣建; 何光强; 方震
Original assignee: Zhongke Guangli Nanjing Medical Electronic Technology Co ltd; Nanjing Runnan Medical Electronic Research Institute Co ltd
Current assignee: Zhongke Guangli Nanjing Medical Electronic Technology Co ltd; Nanjing Runnan Medical Electronic Research Institute Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2021-09-21
Anticipated expiration: 2041-06-18
Also published as: CN113417828B

Abstract

The invention discloses a pneumatic noise elimination device, which comprises a miniature air pump, wherein an air outlet is formed in the top of the miniature air pump, an air suction opening is formed in one side of the air outlet, and a pneumatic silencing ring matched with the air outlet is arranged at the top end of the air outlet; wherein, pneumatic amortization ring is including installing in the gas vent top outside and with it matched with tee bend interface, the cover is equipped with it matched with silica gel hose between the top both ends of tee bend interface, and a plurality of micro gaps have been seted up to the outside of silica gel hose. Has the advantages that: in addition, the gas discharged by the miniature air pump flows oppositely in the pneumatic silencing ring through the three-way connector and collides at a convergence point, so that energy loss is generated, and the starting sound production capacity can be effectively reduced.

Description

Pneumatic noise elimination device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a pneumatic noise eliminating device.

Background

The end-tidal carbon dioxide partial pressure is one of important respiratory indexes, and can reflect not only the ventilation function but also the circulation and pulmonary blood flow conditions. According to different gas sample analysis methods, the monitoring of the end-tidal carbon dioxide partial pressure can be divided into a main flow type and a bypass type. The method for monitoring the partial pressure of the end-tidal carbon dioxide by the bypass flow method needs to use a micro gas sampling pump to sample the exhaled gas of a human body and pump the sampled gas into a sensor gas chamber for concentration analysis.

However, in the sampling process of the traditional micro gas sampling pump, a large pneumatic noise is generated at the exhaust port of the gas pump, so that the emotion and even the health condition of a user are easily affected, and therefore, in order to effectively eliminate the noise, the invention designs the annular silencing structure, so that the generated pneumatic noise can be effectively eliminated.

Disclosure of Invention

In view of the problems in the related art, the present invention provides a pneumatic noise cancellation device to overcome the above technical problems in the related art.

Therefore, the invention adopts the following specific technical scheme:

a pneumatic noise elimination device comprises a micro air pump, wherein an air outlet is formed in the top of the micro air pump, an air suction opening is formed in one side of the air outlet, and a pneumatic silencing ring matched with the air outlet is arranged at the top end of the air outlet; wherein, pneumatic amortization ring is including installing in the gas vent top outside and with it matched with tee bend interface, the cover is equipped with it matched with silica gel hose between the top both ends of tee bend interface, and a plurality of micro gaps have been seted up to the outside of silica gel hose.

Preferably, in order to better realize the connection between the three-way connector and the silica gel hose, the three-way connector is made of polyvinyl chloride materials, and in order to realize the flow of gas in the three-way connector, the three-way connector is a regular three-way connector.

Preferably, the silicone hose has an oval structure in order to form a pneumatic noise reduction ring.

Preferably, in order to enable the gas discharged by the micro air pump to flow into the silicone hose from two ends of the three-way connector respectively, a convergence point is arranged at the middle position of the inner side of the silicone hose.

Preferably, in order to improve the sound absorption effect of the micro-gap, the diameter of the micro-gap is smaller than the inner diameter of the silicone hose.

The invention has the beneficial effects that:

1) by utilizing the characteristic that the energy loss of sound waves in the transmission process depends on the sound resistance of the sound absorption structure, the invention can improve the sound resistance of the micro-gap by utilizing the principle that the sound resistance is in inverse proportion to the square of the aperture by arranging the plurality of micro-gaps on the silica gel hose, thereby effectively improving the sound absorption effect of the micro-gaps.

2) In the invention, the gas discharged by the micro air pump flows oppositely in the pneumatic silencing ring through the three-way connector and collides at the convergence point, so that energy loss is generated, and the starting sound production capacity can be effectively reduced.

3) Compared with the traditional silencer with the micro-perforated plate, the silencer with the micro-perforated plate has the advantages that the size of the small hole is difficult to be small enough sometimes to influence the sound absorption effect due to the manufacturing process, the cost and the like when the silencer is in actual use, the formed micro-gaps are almost in a closed state under the condition that the pressure inside and outside the pipe is the same by utilizing the elastic expansion characteristic of the silica gel hose, and when the pressure inside the pipe is higher than that outside the pipe, the micro-gaps form micro-holes under the action of the pressure, so that the internal gas is discharged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic diagram of a pneumatic noise cancellation arrangement according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a pneumatic noise cancellation device according to an embodiment of the present invention.

In the figure:

1. a micro air pump; 2. an exhaust port; 3. an air extraction opening; 4. a pneumatic silencer ring; 5. a three-way interface; 6. A silica gel hose; 7. micro-gaps; 8. a point of convergence.

Detailed Description

For further explanation of the various embodiments, the drawings which form a part of the disclosure and which are incorporated in and constitute a part of this specification, illustrate embodiments and, together with the description, serve to explain the principles of operation of the embodiments, and to enable others of ordinary skill in the art to understand the various embodiments and advantages of the invention, and, by reference to these figures, reference is made to the accompanying drawings, which are not to scale and wherein like reference numerals generally refer to like elements.

According to an embodiment of the present invention, a pneumatic noise cancellation device is provided.

Referring to the drawings and the detailed description, as shown in fig. 1-2, a pneumatic noise elimination apparatus according to an embodiment of the present invention includes a micro air pump 1, an air outlet 2 is disposed at the top of the micro air pump 1, an air suction port 3 is disposed at one side of the air outlet 2, and a pneumatic noise reduction ring 4 is disposed at the top end of the air outlet 2 and is matched with the air suction port; wherein, pneumatic amortization ring 4 is including installing in 2 top outsides of gas vents and with it matched with tee bend interface 5, the cover is equipped with it matched with silica gel hose 6 between the top both ends of tee bend interface 5, a plurality of microgaps 7 have been seted up to the outside of silica gel hose 6.

By means of the technical scheme, the characteristic that the energy loss of sound waves in the transmission process depends on the sound resistance of the sound absorption structure is utilized, and the plurality of micro gaps 7 are formed in the silica gel hose 6, so that the sound resistance of the micro gaps 7 can be improved by utilizing the principle that the sound resistance is inversely proportional to the square of the aperture, and the sound absorption effect of the micro gaps 7 can be effectively improved.

In one embodiment, the three-way connector 5 is made of polyvinyl chloride material, so that the connection between the three-way connector 5 and the silica gel hose 6 can be better realized, and the three-way connector 5 is a positive three-way connector, so that the flowing of gas in the three-way connector 5 is facilitated.

In one embodiment, the silicone hose 6 has an oval configuration, so that the silicone hose 6 can better form the pneumatic silencer ring 4.

In one embodiment, a convergence point 8 is disposed at a middle position inside the silicone hose 6, so that the gas discharged from the micro air pump 1 can flow to the convergence point 8 from two ends of the three-way joint 5, respectively.

In one embodiment, the diameter of the micro-gap 7 is smaller than the inner diameter of the silicone hose 6, so that the acoustic resistance of the micro-gap 7 can be effectively improved, and the sound absorption effect is better.

For the convenience of understanding the technical solutions of the present invention, the following detailed description will be made on the working principle or the operation mode of the present invention in the practical process.

In practical application, miniature air pump 1 combustion gas flows to convergent point 8 respectively from the both ends of three way connection 5, and in this process, not only can produce energy loss through the collision at the convergent point, thereby reduce and start sound generating capacity, and gas flows in silica gel hose 6 moreover and makes silica gel hose 6's internal pressure increase, thereby impel during gaseous little gap 7 through the silica gel hose 6 discharges the surrounding environment, thereby can utilize the friction loss between gaseous and the little gap 7 to open and realize the noise cancelling effect.

The invention can improve the noise-eliminating capability from two aspects:

1) during the propagation of the sound wave, the energy loss of the sound wave depends on the friction loss of air in the micropores. The friction loss depends on the sound resistance of the sound absorbing structure, the greater the sound resistance, the greater the friction loss, which in turn is inversely proportional to the square of the aperture. Therefore, the smaller the diameter of the small hole, the larger the sound resistance, and the better the sound absorption effect. However, when the conventional silencer with the micro-perforated plate is actually used, the size of the small hole is sometimes difficult to be small enough due to the manufacturing process, cost and the like, and the sound absorption effect is affected. The invention utilizes the elastic expansion characteristic of the silicone tube, the formed micro-seam is almost in a closed state under the condition of the same pressure inside and outside the silicone tube, and when the pressure inside the silicone tube is higher than that outside the silicone tube, the micro-seam forms micro-pores under the action of pressure, so that the internal gas is discharged.

2) The gas discharged by the miniature air pump 1 flows in the pneumatic silencing ring 4 in the opposite direction through the three-way connector 5 and collides at the convergence point 8, so that energy loss is generated, and the starting sound production capacity is reduced.

In summary, according to the above technical solution of the present invention, by utilizing the characteristic that the energy loss of sound waves in the transmission process depends on the size of the sound resistance of the sound absorption structure, the plurality of micro gaps 7 are formed on the silicone hose 6, so that the sound resistance of the micro gaps 7 can be improved by utilizing the principle that the sound resistance is inversely proportional to the square of the aperture, and the sound absorption effect of the micro gaps 7 can be effectively improved.

In addition, the gas discharged by the miniature air pump 1 flows oppositely in the pneumatic silencing ring 4 through the three-way connector 5 and collides at the convergence point 8, so that energy loss is generated, and the starting sound production capacity can be effectively reduced.

In addition, compared with the mode that the size of a small hole is difficult to achieve small enough to influence the sound absorption effect due to the manufacturing process, cost and the like when the traditional silencer with the micro-perforated plate is in actual use, the invention utilizes the elastic expansion characteristic of the silica gel hose 6, the formed micro-gap 7 is almost in a closed state under the condition that the pressure inside and outside the pipe is the same, and when the pressure inside the pipe is higher than that outside the pipe, the micro-gap 7 forms a micro-pore under the pressure action to discharge the internal gas.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "disposed," "connected," "secured," "screwed" and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A pneumatic noise elimination device comprises a micro air pump (1), wherein an air outlet (2) is formed in the top of the micro air pump (1), an air suction opening (3) is formed in one side of the air outlet (2), and the pneumatic noise elimination device is characterized in that a pneumatic noise reduction ring (4) matched with the air outlet (2) is arranged at the top end of the air outlet (2);

wherein, pneumatic amortization ring (4) including install in gas vent (2) top outside and matched with tee bend interface (5) with it, the cover is equipped with matched with silica gel hose (6) with it between the top both ends of tee bend interface (5), a plurality of micro-gaps (7) have been seted up in the outside of silica gel hose (6).

2. The pneumatic noise-abatement device according to claim 1, wherein the three-way connection (5) is made of polyvinyl chloride material.

3. A pneumatic noise cancellation device according to claim 1 or 2, characterized in that the three-way connection (5) is a positive three-way connection.

4. A pneumatic noise cancellation arrangement according to claim 1, characterized in that the silicone hose (6) is of an oval configuration.

5. A pneumatic noise cancellation device according to claim 1 or 4, characterized in that a convergence point (8) is provided in the middle of the inner side of the silicone hose (6).

6. The pneumatic noise cancellation device according to claim 1, characterized in that the diameter of the micro-gap (7) is smaller than the inner diameter of the silicone hose (6).