Breathing filter

Abstract

The breathing filter comprises a shell, a cover piece and a filtering assembly, the shell comprises a first connector, a first connecting part and a cavity wall which are sequentially connected, a step is formed in the connecting position of the first connecting part and the cavity wall, and a first protrusion extending towards the axis of the shell is arranged in the cavity wall; the cover piece comprises a second connector and a second connecting part which are connected, the end, deviating from the second connector, of the second connecting part is connected to the end, deviating from the first connecting part, of the cavity wall, so that a containing cavity is formed in the cavity wall and used for filling the adsorption module, and the first connector and the second connector communicate with the containing cavity; the filtering assembly comprises a first filtering piece located on the side, facing the step, of the adsorption module and a first supporting piece with the two sides abutting against the first protrusion and the first filtering piece respectively, the first supporting piece can make the first filtering piece abut against the step, it can be avoided that dust and particles of the adsorption module leak out to affect breathing of a patient, and medical accidents are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of medical respiratory equipment, and in particular to a respiratory filter. Background Art

[0002] When performing a surgical operation, the patient needs to be anesthetized. Using an anesthesia machine for general anesthesia is a common general anesthesia technique that is safe and fast to use. A respiratory anesthesia machine delivers gaseous anesthetics through breathing to achieve general anesthesia for the patient.

[0003] During the breathing cycle, the anesthesia machine will output the mixed gas formed by oxygen and anesthetic gas and provide it for the patient to inhale through the air inlet pipe at the patient end, so as to achieve the purpose of inhalation anesthesia, and then exhale the mixed gas containing carbon dioxide through the air outlet pipe at the patient end. At this time, the mixed gas exhaled from the air outlet pipe needs to be adsorbed by an adsorption device to remove the carbon dioxide in the mixed gas and allow the oxygen and anesthetic gas in the mixed gas to participate in the next breathing cycle.

[0004] The existing adsorption device is usually a carbon dioxide absorption tank installed inside the anesthesia machine. The tank body contains a carbon dioxide adsorption medium. The adsorption medium can be filled by a doctor and used continuously by multiple patients on the anesthesia machine until the adsorption medium fails. The medical staff then opens it to pour out the failed adsorption medium and fills it with new adsorption medium. The filling process not only generates a large amount of dust pollution, but also is cumbersome and time-consuming. This situation makes it impossible for the anesthesia machine to disconnect the breathing system to replace the carbon dioxide medium during surgery. The doctor needs to evaluate the duration of the operation before the operation to decide whether to replace the medium. If the operation time is long and the remaining carbon dioxide absorption medium is insufficient, it will be replaced before the operation, resulting in waste of incompletely absorbed medium. Similarly, if the operation time is short, multiple patients will share the carbon dioxide absorbent in a carbon dioxide absorption tank. Although filtered, a small amount of dust and bacteria will remain in the anesthesia machine pipeline to a greater or lesser extent. These harmful substances accompany multiple patients sharing the anesthesia machine breathing cycle, which may cause a risk of cross infection between patients.

[0005] In addition, the air inlet channel of the existing adsorption device is small, which will lead to increased airflow resistance and affect the patient's breathing. The filter cotton installed at the air inlet and outlet will have the risk of fiber falling, causing the patient to choke or airway obstruction. The adsorption medium will generate a large amount of dust or small particles during the product transportation and canning process. During the vibration during transportation or during use, the impact of airflow pressure on the filter cotton can easily cause the filter cotton to deform, resulting in gaps around the filter cotton, causing dust and particles in the adsorption medium to leak into the breathing circuit through the gaps, affecting the patient's breathing and causing medical accidents.

[0006] Therefore, how to provide a breathing filter to at least partially solve the above-mentioned drawbacks is a technical problem that those skilled in the art currently need to solve. Summary of the invention

[0007] The purpose of the present invention is to provide a breathing filter which can prevent the dust and particles of the adsorption module from leaking out and affecting the patient's breathing, thereby avoiding medical accidents.

[0008] To achieve the above object, the present invention provides a breathing filter, comprising:

[0009] The housing comprises a first joint, a first connecting portion and a cavity wall which are connected in sequence, a step is formed at the connection between the first connecting portion and the cavity wall, and a first protrusion extending toward the axis of the housing is provided inside the cavity wall;

[0010] The cover comprises a second joint and a second connecting portion connected to each other, wherein one end of the second connecting portion facing away from the second joint is connected to one end of the cavity wall facing away from the first connecting portion, so that a receiving cavity is formed inside the cavity wall, the receiving cavity is used to load the adsorption module, and the first joint and the second joint are connected to the receiving cavity;

[0011] The filter assembly comprises a first filter element located on the side of the adsorption module facing the step, and a first support element with two sides respectively abutting against the first protrusion and the first filter element, wherein the first support element can make the first filter element abut against the step.

[0012] Preferably, the second connecting portion comprises:

[0013] The second connecting portion body is connected to the second joint;

[0014] A first extension portion connected to the second connection portion body and extending in a direction away from the second joint;

[0015] The second extension part is connected to the second connection part body and is sleeved on the outer periphery of the first extension part at intervals. The outer circumferential surface of the second extension part can be attached to the inner side surface of the cavity wall.

[0016] Preferably, the second extension portion is provided with a second protrusion extending toward the axis of the cover;

[0017] The filtering components also include:

[0018] A second filter element is disposed on a side of the adsorption module facing the first extension portion;

[0019] The second support member is clamped on the second protrusion, and a side of the second support member facing the first extension portion abuts against the second filter member, so that the second filter member abuts against the first extension portion.

[0020] Preferably, a first guide plate is provided on one side of the first connecting portion close to the first joint, and the first guide plates are evenly arranged along the circumference of the first connecting portion;

[0021] A second guide plate is provided on one side of the second connecting portion body close to the second joint, and the second guide plates are evenly arranged along the circumference of the second connecting portion body.

[0022] Preferably, there is a gap between the first guide plate and the first filter element in the axial direction of the housing to form a first gas buffer zone;

[0023] There is a gap between the second guide plate and the second filter element in the axial direction of the housing to form a second gas buffer zone.

[0024] Preferably, the first support member and the second support member each include a support member body with a larger cross-sectional diameter and an abutment portion with a smaller cross-sectional diameter, and the abutment portion is located on the opposite sides of the two support member bodies to abut the first filter element or the second filter element.

[0025] Preferably, the first filter element and the second filter element both include electrostatic cotton and non-woven fabrics arranged on both sides of the electrostatic cotton.

[0026] Preferably, both abutting portions are welded to the corresponding non-woven fabrics.

[0027] Preferably, the first guide plate and the second guide plate correspond to each other one by one, and both are plate structures.

[0028] Preferably, the first protrusions are evenly arranged along the circumference of the cavity wall, or the first protrusions are annular protrusions; and,

[0029] The second protrusions are evenly arranged along the circumference of the second extension portion, or the second protrusions are annular protrusions.

[0030] With respect to the above-mentioned background technology, the breathing filter provided by the present invention comprises a shell, a cover and a filter assembly, the shell comprises a first joint, a first connecting part and a cavity wall which are connected in sequence, a step is formed at the connection between the first connecting part and the cavity wall, and a first protrusion extending toward the axis of the shell is provided inside the cavity wall; the cover comprises a second joint and a second connecting part which are connected to each other, an end of the second connecting part which is away from the second joint is connected to an end of the cavity wall which is away from the first connecting part, so that a accommodating cavity is formed inside the cavity wall, and the accommodating cavity is used to load the adsorption module, and the first joint and the second joint are connected to the accommodating cavity; the filter assembly comprises a first filter element which is located on the side of the adsorption module facing the step, and a first support element which is respectively abutted against the first protrusion and the first filter element on both sides, and the first support element enables the first filter element to abut against the step.

[0031] Specifically, a step is formed at the connection between the first connecting portion and the cavity wall, and a first protrusion extending toward the axis of the shell is provided inside the cavity wall, so that the first support member abutting against the first protrusion can press the first filter element to the step. By fixing the first support member, when the airflow pressure impacts the first filter element, no gap can be formed around the first filter element, thereby preventing dust and particles in the adsorption module loaded in the accommodating cavity from leaking along the first filter element to affect the patient's breathing, thereby avoiding medical accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] FIG1 is an exploded view of a breathing filter provided by an embodiment of the present invention;

[0034] FIG2 is a cross-sectional view of the structure of a breathing filter provided by an embodiment of the present invention;

[0035] FIG3 is a partial enlarged view of point A in FIG2;

[0036] FIG4 is a schematic structural diagram of a cover member provided in an embodiment of the present invention;

[0037] FIG5 is a schematic structural diagram of a housing provided in an embodiment of the present invention;

[0038] FIG6 is a schematic structural diagram of a cover member provided by another embodiment of the present invention;

[0039] FIG7 is a schematic structural diagram of a housing provided by another embodiment of the present invention;

[0040] FIG8 is a schematic structural diagram of a first support member and a second support member provided in an embodiment of the present invention;

[0041] FIG. 9 is a schematic structural diagram of a first filter element and a second filter element provided in an embodiment of the present invention.

[0042] in:

[0043] 100 - housing, 110 - first joint, 120 - first connecting portion, 121 - first guide plate, 130 - cavity wall, 131 - first protrusion, 140 - step, 150 - first gas buffer zone;

[0044] 200-cover, 210-second joint, 221-second connecting portion body, 222-first extension portion, 223-second extension portion, 224-second protrusion, 225-second guide plate, 230-second gas buffer zone;

[0045] 300-adsorption module;

[0046] 400 - filter assembly, 410 - first filter element, 411 - electrostatic cotton, 412 - non-woven fabric, 420 - first support element, 421 - support element body, 422 - abutment portion, 430 - second filter element, 440 - second support element. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “backward”, “left” and “right” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present invention.

[0050] The purpose of the present invention is to provide a breathing filter, which can prevent the dust and particles of the adsorption module 300 from leaking out and affecting the patient's breathing, thereby avoiding medical accidents. The breathing filter is installed between the end of the exhalation tube at the patient end and the air inlet of the anesthesia machine. Without stopping the operation of the anesthesia machine, the second connector 210 and the first connector 110 of the breathing filter can be quickly plugged into the connectors of the end of the exhalation tube at the patient end and the air inlet of the ventilator, respectively, to achieve rapid replacement. Since the carbon dioxide absorbent in the breathing filter is pre-installed and has product specifications with different loading amounts, the doctor can also select the appropriate product specification before the operation according to the patient's condition, thereby ensuring that a single product is used by a single patient, thereby avoiding the risk of cross infection when multiple patients share the same product.

[0051] Please refer to FIG. 1 to FIG. 9 . To achieve the above-mentioned purpose, the present invention provides a breathing filter, including a housing 100 , a cover 200 and a filter assembly 400 .

[0052] The shell 100 includes a first joint 110, a first connecting portion 120 and a cavity wall 130 connected in sequence, and a step 140 is formed at the connection between the first connecting portion 120 and the cavity wall 130. The cavity wall 130 is provided with a first protrusion 131 extending toward the axis of the shell 100, wherein the first joint 110 is a hollow structure with a first flow channel provided therein, and the first connecting portion 120 is connected to one side of the first joint 110 and extends outward to form a flared structure for expanding the space connected to the first flow channel. The cover 200 includes a second joint 210 and a second connecting portion that are connected to each other, and one end of the second connecting portion that is away from the second joint 210 is connected to one end of the cavity wall 130 that is away from the first connecting portion 120, so that a accommodating cavity is formed inside the cavity wall 130, and the accommodating cavity is used to load the adsorption module 300, and the first joint 110 and the second joint 210 are connected to the accommodating cavity; the filter assembly 400 includes a first filter element 410 located on the side of the adsorption module 300 facing the step 140, and a first support member 420 that is respectively abutted against the first protrusion 131 and the first filter element 410 on both sides, and the first support member 420 enables the first filter element 410 to abut against the step 140.

[0053] Among them, the second connector 210 is a hollow structure with a second flow channel inside, and the second connecting portion is connected to one side of the second connector 210 and extends outward to form a flared structure for expanding the space connected to the second flow channel. One of the first connector 110 and the second connector 210 is used to connect with the air outlet pipeline at the patient end, and the other is used to connect with the air inlet of the anesthesia machine, so that the gas exhaled by the patient is adsorbed with carbon dioxide for subsequent gas circulation during anesthesia. In this embodiment, the first filter element 410 is pressed to the step 140 by the first support member 420, and the first connector 110 can be used to connect with the air inlet of the anesthesia machine to prevent exhaled bacteria, as well as dust and particles from the adsorption module 300 from entering the subsequent gas circulation through the first connector 110.

[0054] One of the first connector 110 and the second connector 210 is used to connect with the air outlet pipeline on the patient end, and the other is used to connect with the air inlet of the anesthesia machine. The respiratory filter can be quickly replaced without stopping the operation of the anesthesia machine. The carbon dioxide absorbent is pre-installed, and product specifications with different loading quantities can be set according to actual needs. The doctor can select the appropriate product specification before the operation according to the actual situation of each patient, ensuring that a single respiratory filter product is used for a single patient, avoiding the risk of cross infection when multiple patients share the same respiratory filter product.

[0055] By forming a step 140 at the connection between the first connecting portion 120 and the cavity wall 130, and providing a first protrusion 131 extending toward the axis of the shell 100 inside the cavity wall 130, the first support member 420 abutting against the first protrusion 131 can press the first filter element 410 to the step 140. By fixing the first support member 420, when the airflow pressure impacts the first filter element 410, no gap can be formed around the first filter element 410, thereby preventing dust and particles in the adsorption module 300 loaded in the accommodating cavity from leaking along the first filter element 410 to affect the patient's breathing, thereby avoiding medical accidents.

[0056] In some embodiments, the second connecting portion includes a second connecting portion body 221, a first extension portion 222 and a second extension portion 223, the second connecting portion body 221 is connected to the second joint 210; the first extension portion 222 is connected to the second connecting portion body 221 and extends in a direction away from the second joint 210; the second extension portion 223 is connected to the second connecting portion body 221 and is spaced apart on the outer periphery of the first extension portion 222, the outer circumferential surface of the second extension portion 223 can be fitted to the inner side surface of the cavity wall 130, and the second extension portion 223 is provided with a second protrusion 224 extending toward the axis of the cover 200; the filter assembly 400 also includes a second filter element 430 and a second support element 440, the second filter element 430 is arranged on the side of the adsorption module 300 facing the first extension portion 222; the second support element 440 is clamped on the second protrusion 224, and the second support element 440 abuts against the second filter element 430 on the side facing the first extension portion 222, so that the second filter element 430 abuts against the first extension portion 222.

[0057] It can be understood that the second support member 440 is clamped on the second protrusion 224, so that the second support member 440 presses the second filter element 430 against the first extension portion 222, and a gap is left between the second extension portion 223 and the first extension portion 222. The gap can provide a certain deformation space for the first extension portion 222, and provide a certain buffering effect for the airflow passing through the second filter element 430. For example, when the pressure on the first extension portion 222 is too large, the first extension portion 222 can be partially bent to form an elastic member in a compressed state, and when the second filter element 430 is clamped At the same time, in order to avoid the second filter element 430 being too tight and causing problems such as rupture, the first support member 420 and the first filter element 410 can achieve gas filtration at the first flow channel and prevent dust and particles from flowing out of the accommodating chamber. The second support member 440 and the second filter element 430 can achieve gas filtration at the second flow channel and prevent dust and particles from flowing out of the accommodating chamber. In this way, any one of the first connector 110 and the second connector 210 can be connected to the air inlet of the anesthesia machine, which can prevent dust and particles in the adsorption module 300 from entering the subsequent gas circulation.

[0058] In this embodiment, a first guide plate 121 is provided on the side of the first connecting portion 120 close to the first joint 110, and the first guide plate 121 is evenly arranged along the circumference of the first connecting portion 120; a second guide plate 225 is provided on the side of the second connecting portion body 221 close to the second joint 210, and the second guide plate 225 is evenly arranged along the circumference of the second connecting portion body 221, the first guide plate 121 and the second guide plate 225 correspond one to one, and both are plate structures.

[0059] Taking the case where the gas enters along the first flow channel and is discharged along the second flow channel as an example, the gas entering the first connection part 120 along the first flow channel is dispersed between the first flow guide plates 121 through the arrangement of the first flow guide plates 121, so that the gas flow is more evenly distributed to various angles in the first connection part 120, so that the gas is fully in contact with the adsorbent in the adsorption area, and the adsorption is uniform and thorough. The gas that evenly enters the adsorption module 300 is evenly discharged between the second flow guide plates 225 on the second connection part body 221, and then discharged along the second flow channel. When the gas enters along the second flow channel and is discharged along the first flow channel, the effect is similar to the above effect, which will not be elaborated here.

[0060] Among them, there is a gap between the first guide plate 121 and the first filter element 410 in the axial direction of the shell 100 to form a first gas buffer zone 150; there is a gap between the second guide plate 225 and the second filter element 430 in the axial direction of the shell 100 to form a second gas buffer zone 230. Through the setting of the first gas buffer zone 150 and the second gas buffer zone 230, the airflow enters the first gas buffer zone 150 and the second gas buffer zone 230 and then disperses. Since the gas buffer zone has a large dispersion area, the airflow passes through the gas buffer zone at the gas inlet end and enters the adsorption module 300, and then passes through the adsorption module 300 and flows through the gas buffer zone at the gas outlet end. The airflow resistance will be significantly reduced, allowing the patient to breathe smoothly.

[0061] The adsorption module 300 is a carbon dioxide absorbent, usually calcium lime or sodium lime particles. The outer shell of the breathing filter is a transparent structure, and the color change of the carbon dioxide absorbent can be fully observed. When the carbon dioxide absorption is saturated, the color may turn red. At this time, a new breathing filter can be replaced. For replacement, only the first connector 110 and the second connector 210 need to be unplugged and a new breathing filter can be installed. The replacement is convenient and quick. Generally, a patient can use one breathing filter at a time. For patients with long surgical time, two breathing filters can fully meet the needs, avoiding the risk of infection between surgical patients.

[0062] It is understandable that the first support member 420 and the second support member 440 both include a support member body 421 with a larger cross-sectional diameter and an abutment portion 422 with a smaller cross-sectional diameter. The abutment portion 422 is located on the opposite side of the two support member bodies 421 to abut the first filter element 410 or the second filter element 430.

[0063] Specifically, the support member body 421 is a circular ring structure, including a first ring body located on the inner side and a second ring body located on the outer side. Radially extending reinforcing ribs are connected between the first ring body and the second ring body, and all the reinforcing ribs converge to the center position to form a disk. A hollow structure is formed between the reinforcing ribs, the first ring body and the second ring body, which reduces the weight of the support member body 421 and facilitates the flow of gas along the hollow structure. The abutment portion 422 is an annular structure with a cross-sectional size smaller than the second ring body. The abutment portion 422 has a certain thickness in the axial direction of the support member body 421, so that there is a certain interval between the support member body 421 of the first support member 420 and the first filter element 410, and between the support member body 421 of the second support member 440 and the second filter element 430, so as to avoid direct contact between the support member body 421 and the first filter element 410 or the second filter element 430, thereby increasing the effective contact area between the gas and the first filter element 410 or the second filter element 430.

[0064] The cross-sectional dimensions of the abutment portion 422 of the annular structure are smaller than the cross-sectional dimensions of the first filter element 410 and the cross-sectional dimensions of the second filter element 430 to avoid the abutment portion 422 being pressed against the edge of the first filter element 410 or the second filter element 430, causing easy falling off, etc. The abutment portion 422 of the second support member 440 should be arranged corresponding to the first extension portion 222 to facilitate clamping the second filter element 430. The diameter of the abutment portion 422 of the first support member 420 should be larger than the inner diameter of the annular first step so that the abutment portion 422 of the first support member 420 can correspond to the end face of the first step to press the first filter element 410.

[0065] In some embodiments, the first filter element 410 and the second filter element 430 both include electrostatic cotton 411 and non-woven fabric 412 disposed on both sides of the electrostatic cotton 411. The breathable non-woven fabric 412 is located on both sides of the electrostatic cotton 411 and wraps the electrostatic cotton 411, so that the fibers of the electrostatic cotton 411 cannot fall off, ensuring the patient's breathing safety. The two abutment parts 422 are welded together with the non-woven fabric 412 that fits together by ultrasonic welding technology, so that the electrostatic cotton 411 wrapped with the non-woven fabric 412 is always in a flat state, solving the edge gap problem of the electrostatic cotton 411 after the folding. The support frame body and the shell 100 or the cover 200 are connected by mechanical assembly or ultrasonic welding, so that the electrostatic cotton 411 wrapped with the non-woven fabric 412 is firmly fixed, and the dust of the adsorbent cannot leak out. Protect the safety of the patient, and at the same time, the first filter element 410 and the second filter element 430 can block the circulation of bacteria and prevent harmful substances such as bacteria from accompanying the respiratory cycle process.

[0066] In order to make the first filter element 410 and the second filter element 430 the same size for easy processing and installation, and the first support member 420 and the second support member 440 the same size for easy processing and installation, the cavity wall 130 of the shell 100 adopts a barrel-shaped structure with a certain angle between the extension direction and the axis of the shell 100. Specifically, the cross-sectional diameter of the end of the cavity wall 130 away from the first joint 110 is slightly larger than the cross-sectional diameter of the end of the cavity wall 130 close to the first joint 110, so that the cross-sectional diameter of the second extension portion 223 extending into the cavity wall 130 away from the first joint 110 is consistent with the cross-sectional diameter of the end of the cavity wall 130 close to the first joint 110, thereby making the sizes of the first filter element 410 and the second filter element 430 consistent, and the sizes of the first support member 420 and the second support member 440 consistent, and each component has a simple structure and can be produced separately, which is easy to assemble the product.

[0067] A radially extending annular structure is provided on the outer side of the second extension portion 223, through which the annular structure abuts against the end face of the cavity wall 130, and then the annular structure is fixedly connected to the end face of the cavity wall 130 by bonding or ultrasonic welding, thereby achieving the stability of the entire breathing filter structure. In addition, the first protrusion 131 is evenly arranged along the circumference of the cavity wall 130, or the first protrusion 131 is an annular protrusion; and the second protrusion 224 is evenly arranged along the circumference of the second extension portion 223, or the second protrusion 224 is an annular protrusion, which can achieve the fixation of the first support member 420 and the second support member 440.

[0068] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0069] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0070] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A breathing filter, characterized in that include: The housing comprises a first joint, a first connecting portion and a cavity wall which are connected in sequence, wherein a step is formed at the connection between the first connecting portion and the cavity wall, and a first protrusion extending toward the axis of the housing is provided inside the cavity wall; The cover comprises a second joint and a second connecting portion connected to each other, wherein one end of the second connecting portion facing away from the second joint is connected to one end of the cavity wall facing away from the first connecting portion, so that a receiving cavity is formed inside the cavity wall, the receiving cavity is used to load the adsorption module, and the first joint and the second joint are connected to the receiving cavity; The filter assembly includes a first filter element located on the side of the adsorption module facing the step, and first support elements respectively abutting against the first protrusion and the first filter element on both sides, wherein the first support element enables the first filter element to abut against the step.

2. The breathing filter according to claim 1, characterized in that The second connecting portion comprises: A second connecting portion body connected to the second connector; A first extension portion connected to the second connection portion body and extending in a direction away from the second joint; The second extension portion is connected to the second connection portion body and is sleeved at intervals on the outer periphery of the first extension portion. The outer circumferential surface of the second extension portion can be attached to the inner side surface of the cavity wall.

3. The breathing filter according to claim 2, characterized in that The second extension portion is provided with a second protrusion extending toward the axis of the cover; The filter assembly also includes: A second filter element is disposed on a side of the adsorption module facing the first extension portion; The second support member is clamped on the second protrusion, and the second support member abuts against the second filter member on one side facing the first extension portion, so that the second filter member abuts against the first extension portion.

4. The breathing filter according to claim 3, characterized in that A first guide plate is provided on one side of the first connecting portion close to the first joint, and the first guide plates are evenly arranged along the circumference of the first connecting portion; A second guide plate is provided on one side of the second connecting portion body close to the second joint, and the second guide plates are evenly arranged along the circumference of the second connecting portion body.

5. The breathing filter according to claim 4, characterized in that There is a gap between the first guide plate and the first filter element in the axial direction of the housing to form a first gas buffer zone; There is a gap between the second guide plate and the second filter element in the axial direction of the housing to form a second gas buffer zone.

6. The breathing filter according to claim 5, characterized in that The first support member and the second support member each include a support member body with a larger cross-sectional diameter and an abutment portion with a smaller cross-sectional diameter. The abutment portion is located on the opposite side of the two support member bodies to abut the first filter member or the second filter member.

7. The breathing filter according to claim 6, characterized in that The first filter element and the second filter element both include electrostatic cotton and non-woven fabrics arranged on both sides of the electrostatic cotton.

8. The breathing filter according to claim 7, characterized in that The two abutting portions are both welded to the non-woven fabrics that are in contact with each other.

9. The breathing filter according to claim 7, characterized in that The first guide plate and the second guide plate correspond to each other one by one, and both are plate structures.

10. The breathing filter according to any one of claims 3 to 9, characterized in that: The first protrusions are evenly arranged along the circumference of the cavity wall, or the first protrusions are annular protrusions; and, The second protrusions are evenly arranged along the circumference of the second extension portion, or the second protrusions are annular protrusions.

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