Breathing filtering device

Abstract

The utility model provides a breathing filtering device which comprises an air inlet pipe, an air outlet pipe and a shell connecting the air inlet pipe and the air outlet pipe, the interior of the shell is hollowed out to form a cavity communicating the air inlet pipe and the air outlet pipe, a filter element is arranged in the cavity, the filter element comprises a water filtering film and a bacteria filtering film which are sequentially arranged in the air outlet direction, and the water filtering film and the bacteria filtering film are arranged in the air outlet direction. An air inlet cavity is formed in the side, facing the air inlet pipe, of the water filtering film, and an air outlet cavity is formed in the side, facing the air outlet pipe, of the bacteria filtering film; the central axis of the filter element and the central axis of the air inlet pipe and the central axis of the air outlet pipe are arranged at a certain angle. Air flow can be more effectively guided to pass through along the inclined surface of the filter element, so that the air flow is more uniformly distributed on the cross sectional area of the whole filter element, the design is beneficial to further reducing excessive humidification of the central part of the filter element, meanwhile, the air flow passing amount of the edge part of the filter element is increased, and the use efficiency of the whole filter element is improved; and the service life of the breathing filtering device is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a breathing filter device. Background Art

[0002] During invasive ventilation, whether using a ventilator or an anesthesia machine, respiratory filters are installed at the inspiratory and expiratory ends to ensure patient safety and reduce the risk of cross infection.

[0003] At present, the respiratory filters widely used in the market are mostly of corrugated paper design. Their structure is usually composed of three main parts: upper shell, lower shell and filter element. The filter element itself is composed of corrugated paper and filter membrane. This design allows the respiratory airflow to first pass through the corrugated paper part to remove water vapor in the airflow when passing through the filter, and then pass through the filter membrane to filter out possible pathogenic microorganisms.

[0004] However, there are certain limitations in the existing respiratory filter design, that is, the upper and lower shells surround the filter element too tightly, resulting in uneven distribution of the respiratory airflow when passing through the filter element. A large amount of airflow tends to pass through the central part of the filter element, while less airflow passes through the peripheral parts. Therefore, after a short period of use, the central part of the filter element will be over-humidified, but most of the airflow still passes through the central part of the filter element, resulting in the corrugated paper being unable to fully filter out water vapor in the airflow, thereby affecting the airflow permeability of the filter membrane. The filter element usually needs to be replaced every 4 to 6 hours, and its service life is short. Utility Model Content

[0005] Based on this, the purpose of the present invention is to provide a respiratory filter device to solve the technical problems mentioned in the above background technology.

[0006] The utility model provides a breathing filter device, comprising an air inlet pipe, an air outlet pipe and a shell connecting the two, wherein the interior of the shell is hollowed out to form a cavity connecting the air inlet pipe and the air outlet pipe, wherein a filter element is arranged in the cavity, wherein the filter element comprises a water filter membrane and a bacteria filter membrane arranged in sequence along the air outlet direction, wherein the water filter membrane vacates an air inlet cavity toward one side of the air inlet pipe, and the bacteria filter membrane vacates an air outlet cavity toward one side of the air outlet pipe;

[0007] Wherein, the central axis of the filter element is arranged at a certain angle to the central axes of the air inlet pipe and the air outlet pipe.

[0008] Furthermore, in the respiratory filtration device, the central axis of the filter element and the central axis of the air inlet pipe form a first acute angle, and the central axis of the filter element and the central axis of the air outlet pipe form a second acute angle.

[0009] Furthermore, in the respiratory filtration device, the first acute angle is 10° to 15°, and the second acute angle is the same as the first acute angle.

[0010] Further, the breathing filter device, wherein the housing comprises an upper housing and a lower housing, the air inlet pipe is arranged on the lower housing, and the central axes of the two form the first acute angle, and the air outlet pipe is arranged on the upper housing, and the central axes of the two form the second acute angle;

[0011] The periphery of the water filter membrane is connected to the inner wall of the lower shell, and the central axes of the two are collinear; the periphery of the bacteria filter membrane is connected to the inner wall of the upper shell, and the central axes of the two are collinear;

[0012] The upper shell and the lower shell are spliced ​​together via a connecting structure.

[0013] Furthermore, the breathing filter device, wherein the lower shell includes a first segment and a second segment arranged in sequence along the air outlet direction, the water filter membrane is arranged in the space defined by the second segment, the air inlet cavity is the space defined by the first segment, and the axial length of the second segment is greater than the axial length of the first segment.

[0014] Furthermore, in the breathing filter device, the connection structure includes an internal thread provided on the inner wall of the upper shell, and an external thread provided on the outer wall of the second segment, and the internal thread cooperates with the external thread so that the upper shell and the lower shell are assembled as one.

[0015] Furthermore, in the respiratory filtration device, the inner diameter of the first segment gradually increases along the air outlet direction, and the inner diameter of the lower shell gradually decreases along the air outlet direction.

[0016] Furthermore, in the breathing filter device, the first segment and the upper shell are both hemispherical.

[0017] Furthermore, in the respiratory filtration device, the inner wall of the upper shell is provided with a limit baffle that stops against the bacterial filter membrane.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. By leaving an air inlet cavity on one side of the water filter membrane and an air outlet cavity on the other side of the bacteria filter membrane, it is helpful to form an orderly air flow channel inside the shell, so that the air flow can evenly and fully contact the filter element when passing through the filter element, avoiding the situation where the air flow tends to pass through the central part of the filter element, while the air flow through the peripheral parts is less.

[0020] 2. The central axis of the filter element is set at a certain angle to the central axes of the inlet pipe and the outlet pipe. It can more effectively guide the airflow to pass along the inclined surface of the filter element, so that the airflow is more evenly distributed over the cross-sectional area of ​​the entire filter element. This design helps to further reduce excessive humidification in the central part of the filter element, while increasing the airflow through the edge of the filter element, thereby improving the use efficiency of the entire filter element and extending the service life of the respiratory filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional diagram of the breathing filter device in the utility model;

[0022] Figure 2 This is an exploded view of the breathing filter device in the utility model;

[0023] Figure 3 It is a cross-sectional view of the breathing filter device in the utility model;

[0024] Description of main component symbols:

[0025] 10. Air inlet pipe; 20. Air outlet pipe; 40. Filter element; 41. Water filter membrane; 42. Bacteria filter membrane; 51. Air inlet cavity; 52. Air outlet cavity; 61. First acute angle; 62. Second acute angle; 31. Upper shell; 32. Lower shell; 321. First section; 322. Second section; 70. Limit baffle.

[0026] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] See also Figures 1 to 3 The breathing filter device in the utility model comprises an air inlet pipe 10, an air outlet pipe 20 and a shell connecting the two. The interior of the shell is hollowed out to form a cavity connecting the air inlet pipe 10 and the air outlet pipe 20. A filter element 40 is arranged in the cavity. The filter element 40 comprises a water filter membrane 41 and a bacteria filter membrane 42 arranged in sequence along the air outlet direction. The water filter membrane 41 empties an air inlet cavity 51 toward one side of the air inlet pipe 10, and the bacteria filter membrane 42 empties an air outlet cavity 52 toward one side of the air outlet pipe 20.

[0031] The central axis of the filter element 40 is arranged at a certain angle to the central axes of the air inlet pipe 10 and the air outlet pipe 20 .

[0032] It can be understood that by leaving the air inlet cavity 51 on one side of the water filter membrane 41 and the air outlet cavity 52 on the other side of the bacteria filter membrane 42, it is helpful to form an orderly airflow channel inside the housing, so that the airflow can evenly and fully contact the filter element 40 when passing through the filter element 40, avoiding the situation where the airflow tends to pass through the central part of the filter element 40, while the airflow passing through the peripheral part is less. Secondly, the central axis of the filter element 40 is set at a certain angle to the central axis of the air inlet pipe 10 and the air outlet pipe 20, which can more effectively guide the airflow to pass along the inclined surface of the filter element 40, so that the airflow is more evenly distributed over the cross-sectional area of ​​the entire filter element 40. This design helps to further reduce the excessive humidification of the central part of the filter element 40, while increasing the airflow passing through the edge part of the filter element 40, improving the use efficiency of the entire filter element 40, and extending the service life of the respiratory filter device.

[0033] It should be noted that, in this embodiment, the bacterial filter membrane 42 may be a polypropylene fiber film, which is used to filter out pathogenic microorganisms in the pipeline airflow to avoid cross infection in the ICU or operating room; the water filter membrane 41 may be corrugated paper, which is used to filter out water vapor in the exhalation end.

[0034] In this embodiment, the central axis of the filter element 40 and the central axis of the air inlet pipe 10 form a first acute angle 61, and the central axis of the filter element 40 and the central axis of the air outlet pipe 20 form a second acute angle 62, the first acute angle 61 is 10° to 15°, and the second acute angle 62 is the same as the first acute angle 61. This angle design not only satisfies the inclined setting of the filter element 40 relative to the air inlet pipe 10 and the air outlet pipe 20, but also helps the airflow to switch more smoothly when entering and leaving the filter element 40, and the smaller air path angle change allows the airflow to pass through the filter device more smoothly.

[0035] like Figure 3 As shown, the housing includes an upper housing 31 and a lower housing 32, the air inlet pipe 10 is disposed on the lower housing 32, and the central axes of the two form the first acute angle 61, and the air outlet pipe 20 is disposed on the upper housing 31, and the central axes of the two form the second acute angle 62;

[0036] The periphery of the water filter membrane 41 is connected to the inner wall of the lower shell 32, and the central axes of the two are collinear; the periphery of the bacteria filter membrane 42 is connected to the inner wall of the upper shell 31, and the central axes of the two are collinear;

[0037] The upper shell 31 and the lower shell 32 are integrally connected via a connecting structure.

[0038] Continue reading Figure 3 The lower housing 32 includes a first segment 321 and a second segment 322 arranged in sequence along the air outlet direction, the water filter membrane 41 is arranged in the space defined by the second segment 322, the air inlet cavity 51 is the space defined by the first segment 321, and the axial length of the second segment 322 is greater than the axial length of the first segment 321. It can be understood that the axial length of the second segment 322 is greater than the axial length of the first segment 321, so that a thicker water filter membrane 41 can be arranged inside the lower housing 32 to improve the filtering effect on water and extend the service life of the breathing filter device.

[0039] Specifically, the connection structure includes an internal thread (not shown) provided on the inner side wall of the upper shell 31, and an external thread (not shown) provided on the outer side wall of the second segment 322, wherein the internal thread cooperates with the external thread so that the upper shell 31 and the lower shell 32 are assembled as one. Figure 1 It can be understood that the matching design of the internal thread and the external thread enables the upper shell 31 and the lower shell 32 to be quickly and firmly connected together. When the filter element 40 needs to be replaced, the medical staff can quickly unscrew the threaded connection without using additional tools, saving time and improving work efficiency.

[0040] For further information, see Figure 3, the inner diameter of the first segment 321 gradually increases along the gas outlet direction, and the inner diameter of the lower shell 32 gradually decreases along the gas outlet direction. It can be understood that in the air inlet cavity 51, the gradually increasing inner diameter can gradually reduce the airflow speed, reduce the impact of the airflow on the water filter membrane 41, thereby avoiding damage to the filter element 40 or reduced filtering effect caused by excessive airflow. In the exhaust cavity, the gradually decreasing inner diameter can speed up the airflow speed, which helps to quickly discharge the filtered gas.

[0041] like Figure 3 As shown, in this embodiment, the first segment 321 and the upper shell 31 are both hemispherical. Of course, in other embodiments, the first segment 321 and the upper shell 31 can also be conical, and this embodiment is only an example and not a limitation.

[0042] For further information, see Figure 3 The inner wall of the upper shell 31 is provided with a limit baffle 70 for stopping the bacteria filter membrane 42. It can be understood that since the bacteria filter membrane 42 is relatively thin, the installation position of the bacteria filter membrane 42 is limited by the limit baffle 70 to prevent it from moving or deforming under the impact of airflow, thereby ensuring that the bacteria filter membrane 42 is always in the correct working position to ensure the bacteria filtering effect.

[0043] In summary, the breathing filter device in the above embodiment of the utility model, by leaving an air inlet cavity 51 on one side of the water filter membrane 41 and leaving an air outlet cavity 52 on the other side of the bacteria filter membrane 42, helps to form an orderly airflow channel inside the shell, so that the airflow can evenly and fully contact the filter element 40 when passing through the filter element 40, avoiding the situation that the airflow tends to pass through the central part of the filter element 40, while the airflow passing through the peripheral part is less. Secondly, the central axis of the filter element 40 is set at a certain angle to the central axis of the air inlet pipe 10 and the air outlet pipe 20, which can more effectively guide the airflow to pass along the inclined surface of the filter element 40, so that the airflow is more evenly distributed over the cross-sectional area of ​​the entire filter element 40. This design helps to further reduce the excessive humidification of the central part of the filter element 40, while increasing the airflow passing through the edge part of the filter element 40, improving the use efficiency of the entire filter element 40, and extending the service life of the breathing filter device.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0045] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A breathing filter device, characterized in that: The invention comprises an air inlet pipe, an air outlet pipe and a shell connecting the two, wherein the interior of the shell is hollowed out to form a cavity connecting the air inlet pipe and the air outlet pipe, wherein a filter element is arranged in the cavity, and the filter element comprises a water filter membrane and a bacteria filter membrane arranged in sequence along the air outlet direction, wherein the water filter membrane vacates an air inlet cavity toward one side of the air inlet pipe, and the bacteria filter membrane vacates an air outlet cavity toward one side of the air outlet pipe; Wherein, the central axis of the filter element is arranged at a certain angle to the central axes of the air inlet pipe and the air outlet pipe.

2. The breathing filter device according to claim 1, characterized in that: The central axis of the filter element and the central axis of the air inlet pipe form a first acute angle, and the central axis of the filter element and the central axis of the air outlet pipe form a second acute angle.

3. The breathing filter device according to claim 2, characterized in that: The first acute angle is 10° to 15°, and the second acute angle is the same as the first acute angle.

4. The breathing filter device according to claim 3, characterized in that: The housing comprises an upper housing and a lower housing, the air inlet pipe is arranged on the lower housing, and the central axes of the two form the first acute angle, and the air outlet pipe is arranged on the upper housing, and the central axes of the two form the second acute angle; The periphery of the water filter membrane is connected to the inner wall of the lower shell, and the central axes of the two are collinear; the periphery of the bacteria filter membrane is connected to the inner wall of the upper shell, and the central axes of the two are collinear; The upper shell and the lower shell are spliced ​​together via a connecting structure.

5. The breathing filter device according to claim 4, characterized in that: The lower shell includes a first segment and a second segment arranged in sequence along the air outlet direction, the water filter membrane is arranged in the space defined by the second segment, the air inlet cavity is the space defined by the first segment, and the axial length of the second segment is greater than the axial length of the first segment.

6. The breathing filter device according to claim 5, characterized in that The connection structure includes an internal thread provided on the inner side wall of the upper shell, and an external thread provided on the outer side wall of the second segment, and the internal thread cooperates with the external thread so that the upper shell and the lower shell are assembled as one.

7. The breathing filter device according to claim 5, characterized in that The inner diameter of the first segment gradually increases along the gas outlet direction, and the inner diameter of the lower shell gradually decreases along the gas outlet direction.

8. The breathing filter device according to claim 7, characterized in that: The first segment and the upper shell are both hemispherical.

9. The breathing filter device according to claim 4, characterized in that: The inner wall of the upper shell is provided with a limit baffle which stops against the bacteria filtering membrane.

Images