Gas circuit structure for gas taking of compressor of portable oxygen generator

Abstract

The air path structure comprises a cover body, a fan, a base and a filtering assembly, an opening is formed in the top of the cover body, an air pipe is arranged on the side wall of the cover body, an air outlet of the fan is communicated with the interior of the cover body, one end of the air pipe is communicated with the air outlet of the fan, and a containing cavity and an air inlet pipe are arranged on the base; an air suction port is formed in the inner bottom of the containing cavity, the cover body is arranged on the base, the other end of the air pipe is communicated with one end of the air inlet pipe, the other end of the air inlet pipe is communicated with the containing cavity, and the filtering assembly is contained in the containing cavity. According to the air path structure, the air suction efficiency of the compressor can be improved, the air taking amount can be guaranteed, air taking of the compressor is smoother, noise generated by air suction of the compressor and noise generated by a fan can be effectively overlapped together, noise sources are reduced, the total noise amount can be reduced, in addition, pipeline connection in the oxygen generator can be reduced, and the cost is reduced. And the noise of the whole machine can be effectively reduced while pipelines are reduced.

Description

Technical Field

[0001] The present invention relates to the field of oxygen generators, and particularly to an air path structure for air intake of a compressor used in a portable oxygen generator. Background Art

[0002] A portable oxygen generator is a small device designed for users who need oxygen therapy. With its portability, ease of use and stability, it provides great convenience for users, especially suitable for users who need long-term oxygen therapy or outdoor activities, and can significantly improve the quality of life.

[0003] In existing portable oxygen generators on the market, the compressor basically directly inhales air from the surrounding environment. Not only is it difficult to ensure the air intake volume, but also a part of the noise is generated when the air inlet of the compressor inhales air. Coupled with the noise generated by the cooling fan in the oxygen generator, this will increase the noise sources during the operation of the oxygen generator.

[0004] In addition, for some portable oxygen generators, the air inlet of the compressor is connected to a pipeline (usually a silica gel pipeline), and the free end of the pipeline is set at a certain position on the body of the oxygen generator. This method has the following disadvantages:

[0005] 1) There are many connected pipelines, resulting in an increase in potential hazards;

[0006] 2) Many pipelines lead to poor tidiness and lack of aesthetics;

[0007] 3) The pipeline material is mostly silica gel, and the sound absorption effect is poor;

[0008] 4) More pipelines occupy a large space inside the portable oxygen generator, adding an obstacle to the further miniaturization of the portable oxygen generator. Summary of the Invention

[0009] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide an air path structure for air intake of a compressor used in a portable oxygen generator.

[0010] According to one aspect of the present invention, there is provided an air path structure for air intake of a compressor used in a portable oxygen generator, including:

[0011] A housing for covering the compressor, the top of the housing is provided with an opening, and an air pipe is provided on the side wall of the housing;

[0012] A fan, the fan is arranged at the opening, the air outlet of the fan is communicated with the inside of the housing, and one end of the air pipe is communicated with the air outlet of the fan;

[0013] A base, the base is provided with a receiving cavity and an air inlet pipe, the inner bottom of the receiving cavity is provided with an air inlet for inserting an air suction pipe on the compressor, the housing is arranged on the base, the other end of the air pipe is communicated with one end of the air inlet pipe, and the other end of the air inlet pipe is communicated with the receiving cavity; and

[0014] A filter assembly is accommodated in the accommodating cavity.

[0015] Under the action of the fan, the air flow can enter the air intake through the air pipe, the air intake pipe, and the filter component in sequence.

[0016] The air path structure for a portable oxygen concentrator of the present invention is that the compressor of the oxygen concentrator is installed in a space enclosed by a cover body and a base, and the air intake pipe on the compressor is connected to the air intake port on the base. When the fan is working, a part of the airflow blown out from the air outlet of the fan is used to dissipate the heat of the compressor in the cover body, and the other part enters the air intake pipe of the compressor through the air pipe on the side wall of the cover body, the air intake pipe on the base, the filter assembly, and the air intake port. Combined with the suction force of the compressor itself, the air intake efficiency of the compressor can be improved, the air intake of the compressor can be guaranteed, and the air intake of the compressor can be smoother. Moreover, the noise generated by the compressor air intake can be effectively superimposed on the noise generated by the fan, which not only reduces the noise source, but also reduces the total noise amount. In addition, the air path for the compressor to take in air is composed of the air intake pipe on the base and the air pipe on the cover body, which can reduce the pipeline connection in the oxygen concentrator, and while reducing the pipeline, the noise of the whole machine can be effectively reduced. It can also effectively reduce the occupied space inside the portable oxygen concentrator, providing the possibility for further miniaturization of the portable oxygen concentrator.

[0017] Furthermore, it also includes a sealing member, which is arranged between the air outlet and the opening of the fan. A connecting pipe is provided on the side of the sealing member, one end of the connecting pipe is connected to one end of the air pipe, and the other end of the connecting pipe is connected to the air outlet of the fan. A receiving groove is provided on the top of the cover body, and the connecting pipe is received in the receiving groove.

[0018] Therefore, the seal can seal the gap between the air outlet of the fan and the opening on the cover, effectively sealing the noise generated by the operation of the compressor inside the cover, thereby effectively reducing the noise of the entire machine. The accommodating groove on the cover can accommodate and position the connecting pipe on the seal, ensuring that the connecting pipe on the seal will not swing easily during the suction process of the compressor.

[0019] Furthermore, an inclined portion is provided at the bottom of one side of the seal, and two downwardly extending stoppers are provided at the bottom of the seal. The two stoppers are respectively located on both sides of the inclined portion and are respectively connected to both sides of the inclined portion. The port at the other end of the connecting tube is located at the intersection of the inclined portion and a stopper.

[0020] Therefore, the structure formed by the inclined portion and the two blocking portions can not only guide a part of the airflow blown out by the fan to the compressor in the cover body to dissipate heat from the compressor, but also, since the port of the connecting pipe is located at the intersection of the inclined portion and a blocking portion, it can also ensure that the other part of the airflow blown out by the fan is blown into the connecting pipe on the side of the seal.

[0021] Furthermore, a clamping groove is provided around the opening, and a clamping step adapted to the clamping groove is provided around the seal. The clamping step on the seal is clamped in the clamping groove around the opening.

[0022] Therefore, through the clamping fit between the clamping step and the clamping groove of the seal, the seal can be stably installed around the opening, ensuring effective sealing of the gap between the air outlet of the fan and the opening on the housing.

[0023] Furthermore, one end of the connecting pipe is provided with an insertion pipe communicating with the connecting pipe, and the insertion pipe is inserted into the air pipe.

[0024] Therefore, through the insertion pipe, the seal can be quickly connected to the air pipe on the side wall of the housing to realize the conduction connection between the connecting pipe and the air pipe.

[0025] Furthermore, the material of the seal is rubber or silica gel.

[0026] Therefore, the seal made of rubber or silica gel can not only ensure the sealing performance but also effectively seal the noise generated during the operation of the compressor inside the housing, thereby effectively reducing the noise of the whole machine, and can also reduce the noise generated by vibration during the operation of the fan.

[0027] Furthermore, the filter assembly includes a filter plate, a filter layer and a cover. An installation hole is provided in the middle of the filter plate, the filter layer is arranged on the filter plate to cover the installation hole, the filter plate is accommodated in the accommodation cavity and the filter layer covers the air suction port, and the cover covers the opening of the accommodation cavity to cover the accommodation cavity.

[0028] Therefore, under the suction of the compressor and the blowing of the fan, a part of the air flow blown by the fan enters the accommodation cavity through the air pipe on the side wall of the housing and the intake pipe on the base, and then the air flow enters the air suction port through the filter layer for the compressor to suck air. The filter layer can filter out dust and impurities in the air, which helps the molecular sieve in the oxygen generator to more effectively separate oxygen and nitrogen, ensuring that the finally output oxygen is purer. Moreover, after filtering out dust and impurities in the air, the equipment failure rate can be reduced, ensuring the stable operation of the oxygen generator, and the cover can prevent the air flow from overflowing.

[0029] Furthermore, a circle of protrusions is provided around the filter plate, a through hole communicating with the other end of the intake pipe is provided on the filter plate, a circle of bosses is provided around the installation hole, a circle of clamping grooves is provided on the inner wall of the bosses, and the periphery of the filter layer is clamped in the clamping grooves.

[0030] Therefore, the filter layer can be stably installed on the filter plate through the card slots to cover the mounting holes. Under the suction force of the compressor and the blowing force of the fan, a part of the air flow blown by the fan enters the space enclosed by the cover body and the filter plate through the air pipe on the side wall of the cover body, the air inlet pipe on the base, and the through holes on the filter plate, and then enters the suction port through the filter layer for the compressor to suck. This design of the filter plate can ensure that all the air passes through the filter layer and then enters the suction port for the compressor to suck, guaranteeing the air filtration quality.

[0031] Furthermore, the height of the protrusion is higher than that of the boss.

[0032] Therefore, such a design can ensure that the height of the filter layer is lower than that of the protrusion. After the cover body is closed, a gap is ensured between the filter layer and the cover body, so that the air entering from the through holes can flow to the space between the filter layer and the cover body. Under the suction force of the compressor and the blowing force of the fan, the air can smoothly pass through the filter layer and enter the suction port for the compressor to suck.

[0033] Furthermore, it also includes a sound-absorbing film. The sound-absorbing film is arranged on the inner bottom of the accommodating cavity to cover the suction port. The sound-absorbing film is provided with air inlet holes, and the sound-absorbing film is located between the filter layer and the inner bottom of the accommodating cavity.

[0034] Under the action of the fan, the air flow can sequentially enter the suction port through the air pipe, the air inlet pipe, the through holes, the filter layer, and the air inlet holes on the sound-absorbing film.

[0035] Therefore, the sound-absorbing film can further reduce the noise generated at the suction pipe of the compressor, effectively reducing the noise of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of an air path structure for air intake of a compressor used in a portable oxygen generator according to the present invention;

[0037] Figure 2 For Figure 1 The split structural diagram of the air path structure shown;

[0038] Figure 3 For Figure 1 The structural diagram of another perspective of the air path structure shown;

[0039] Figure 4 For Figure 3 The split structural diagram of the air path structure shown;

[0040] Figure 5 For Figure 1 The split structural diagram after installing the compressor in the air path structure shown;

[0041] Figure 6 For Figure 2Schematic diagram of the structure of the seal in the shown gas path structure;

[0042] Figure 7 is Figure 6 Schematic diagram of the structure of the shown seal from another perspective;

[0043] Figure 8 is Figure 6 Schematic diagram of the structure of the shown seal from yet another perspective;

[0044] Figure 9 is Figure 2 Schematic diagram of the structure of the filter plate and filter layer in the shown gas path structure;

[0045] Figure 10 is Figure 2 Schematic diagram of the structure of the filter plate and filter layer in the shown gas path structure from another perspective;

[0046] Figure 11 is Figure 2 Exploded view schematic diagram of the filter plate and filter layer in the shown gas path structure;

[0047] Figure 12 is Figure 2 Schematic diagram of the structure of the filter plate and filter layer in the shown gas path structure from yet another perspective;

[0048] Figure 13 is Figure 12 Cross-sectional view schematic diagram of the filter plate and filter layer along the A-A direction. Detailed implementation manner

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0050] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more; it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements.

[0051] Referring to Figures 1 to 13 , a gas path structure for compressor air intake of a portable oxygen generator, includes a cover body 1, a fan 2, a base 3, a filter assembly 4, a seal 5 and a sound-absorbing film 6.

[0052] Referring to Figure 1 and Figure 3 , the cover body 1 is installed on the base 3, and the cover body 1 and the base 3 can be fixed by buckles or screws. Referring to Figure 5 , in the space enclosed by the cover body 1 and the base 3, a compressor 7 is installed. The cover body 1 can cover the periphery of the compressor 7 to protect and soundproof the compressor 7.

[0053] Referring to Figure 1 , Figure 2 and Figure 5 , an opening 11 and a receiving groove 13 are formed at the top of the cover body 1, and an air pipe 12 is formed on the side wall of the cover body 1. The fan 2 is installed at the opening 11, and the air outlet of the fan 2 is communicated with the inside of the cover body 1. The top end of the air pipe 12 is communicated with the air outlet of the fan 2; specifically: Referring to Figure 1 , Figure 2 , Figure 4 and Figure 5 , the air outlet 21 of the fan 2 is located at the bottom of the fan 2. A seal 5 is installed between the air outlet 21 of the fan 2 and the opening 11. A connecting pipe 51 is formed on the side of the seal 5. The connecting pipe 51 is snap-fitted and fixed in the receiving groove 13. One end of the connecting pipe 51 ( Figure 2 the right end of the connecting pipe 51 in Figure 2The port (left end of the middle connecting pipe 51) is located on the inner wall of the sealing member 5, so that the air outlet 21 of the fan 2 can be connected with the air pipe 12 through the connecting pipe 51 and the plug-in pipe 511, and the sealing member 5 can seal the gap between the air outlet 21 of the fan 2 and the opening 11 on the cover body 1, so as to effectively seal the noise generated by the operation of the compressor inside the cover body 1, thereby effectively reducing the noise of the whole machine, and the accommodating groove 13 on the cover body 1 can accommodate and position the connecting pipe 51 on the sealing member 5, so as to ensure that the connecting pipe 51 on the sealing member 5 will not swing easily during the suction process of the compressor.

[0054] See also Figure 2 The periphery of the opening 11 is formed with a snap-in groove 111, see Figure 7 and Figure 8 The sealing member 5 is formed with a snap-in step 54 adapted to the snap-in groove 111 on its periphery. The snap-in step 54 on the sealing member 5 is snap-fitted into the snap-in groove 111 on the periphery of the opening 11. The sealing member 5 can be securely installed on the periphery of the opening 11 through the snap-in cooperation between the snap-in step 54 and the snap-in groove 111, thereby ensuring that the gap between the air outlet of the fan 2 and the opening 11 on the cover body 1 is effectively sealed.

[0055] See also Figures 6 to 8 An inclined portion 52 is formed at the bottom of one side of the sealing member 5, and two downwardly extending stoppers 53 are formed at the bottom of the sealing member 5. The two stoppers 53 are respectively located at both sides of the inclined portion 52 and are respectively connected to both sides of the inclined portion 52 as a whole. The port 512 of the connecting pipe 51 is located at the intersection of the inclined portion 52 and one stopper 53. The structure formed by the inclined portion 52 and the two stoppers 53 can guide a part of the airflow blown out by the fan 2 to the compressor facing the cover body 1 to blow air and dissipate heat for the compressor. Since the port 512 of the connecting pipe 51 is located at the intersection of the inclined portion 52 and one stopper 53, it can also ensure that another part of the airflow blown out by the fan 2 is blown into the connecting pipe 51.

[0056] The material of the seal 5 can be rubber or silicone. The seal 5 made of rubber or silicone can not only ensure the sealing but also effectively seal the noise generated by the operation of the compressor inside the cover 1, thereby effectively reducing the noise of the whole machine. The seal 5 can also reduce the noise generated by vibration during the operation of the fan 2. The seal 5 can be quickly connected to the air pipe 12 on the side wall of the cover 1 through the plug-in tube 511 to achieve the conductive connection between the connecting tube 51 and the air pipe 12.

[0057] See also Figure 2 , Figure 4 and Figure 5, a concave accommodation cavity 31 and an air inlet pipe 32 are formed on the base 3. An air suction port 311 is formed on the inner bottom of the accommodation cavity 31. The air suction port 311 is used for inserting the suction pipe on the compressor. In this embodiment, the number of the air suction ports 311 is two, and the number of the air suction ports 311 is adapted to the number of the suction pipes on the compressor. The top of the air inlet pipe 32 is inserted into the port at the bottom of the air pipe 12, and the bottom of the air inlet pipe 32 is communicated with the accommodation cavity 31, so that the air pipe 12 can be communicated with the accommodation cavity 31.

[0058] The filtering component 4 is installed in the accommodation cavity 31. Specifically: Refer to Figure 2 , Figure 4 , Figures 9 to 13 , the filtering component 4 includes a filter plate 41, a filtering layer 42 and a cover body 43. The shape of the periphery of the filter plate 41 is adapted to the shape of the inner wall of the accommodation cavity 31. An installation hole 411 is formed in the middle of the filter plate 41. The filtering layer 42 is installed on the filter plate 41 to cover the installation hole 411. The filter plate 41 is accommodated in the accommodation cavity 31 and the filtering layer 42 covers the air suction port 311. The cover body 43 is covered on the opening of the accommodation cavity 31 to cover the accommodation cavity 31. The cover body 43 can be installed at the opening of the accommodation cavity 31 by means of snap connection or screw connection. The cover body 43 can prevent air leakage.

[0059] Refer to Figure 10 and Figure 11 , a raised edge 412 is formed around the periphery of the filter plate 41, and through holes 413 are formed at the corner positions of the filter plate 41. When the filter plate 41 is accommodated in the accommodation cavity 31, the port of the air inlet pipe 32 is aligned with the port of the through hole 413 on the filter plate 41. A raised platform 414 is formed around the periphery of the installation hole 411, and a card slot 415 is formed on the inner wall of the raised platform 414. The periphery of the filtering layer 42 is clamped in the card slot 415 to cover the installation hole 411. The height of the raised edge 412 is higher than the height of the raised platform 414. The filtering layer 42 can be stably installed on the filter plate 41 through the card slot 415 to cover the installation hole 411; Refer to Figure 2 and Figure 4, under the suction of the compressor and the blowing of the fan 2, a part of the airflow blown by the fan 2 enters the space enclosed by the cover body 43 and the filter plate 41 through the air pipe 12 on the side wall of the cover body 1, the air inlet pipe 32 on the base 3, and the through hole 413 on the filter plate 41, and then enters the suction port 311 through the filter layer 42 for the compressor to suck. This design of the filter plate 41 can ensure that all the air passes through the filter layer 42 and then enters the suction port 311 for the compressor to suck, guaranteeing the air filtration quality. Moreover, since the height of the protrusion 412 is higher than that of the boss 414, it can ensure that the height of the filter layer 42 is lower than that of the protrusion 412. After the cover body 43 is closed, there is a gap between the filter layer 42 and the cover body 43, so that the air entering from the through hole 413 can flow between the filter layer 42 and the cover body 43. Under the suction of the compressor and the blowing of the fan 2, the air can smoothly pass through the filter layer 42 and enter the suction port 311 for the compressor to suck. The filter layer 42 can filter out dust and impurities in the air, which helps the molecular sieve in the oxygen generator to more effectively separate oxygen and nitrogen, ensuring that the finally output oxygen is purer. Moreover, after filtering out dust and impurities in the air, it can reduce the equipment failure rate and ensure the stable operation of the oxygen generator.

[0060] Refer to Figures 11 to 13 , in this embodiment, the filter layer 42 includes a stacked filter cotton layer 421 and a PET sintered filter layer 422. The PET sintered filter layer 422 is formed by sintering PET materials. Both the inside and the surface of the PET sintered filter layer 422 are porous structures. The filter cotton layer 421 can filter the air for the first time, and the PET sintered filter layer 422 with porous structures both inside and on the surface can filter the air for the second time and eliminate noise. The PET sintered filter layer 422 is entirely microporous. The porous structure inside the PET sintered filter layer 422 can effectively absorb sound wave energy, reduce sound wave reflection and propagation, and thus reduce noise. In other embodiments, according to the filtration requirements, the filter layer 42 can also be composed only of the filter cotton layer 421, and the material of the filter cotton layer 421 can be directly selected from those existing in the oxygen generators on the market.

[0061] Refer to Figure 2 and Figure 4, the sound-absorbing film 6 is installed on the inner bottom of the accommodation cavity 31 to cover the air suction port 311. The sound-absorbing film 6 is located between the filter plate 41 and the inner bottom of the accommodation cavity 31, and between the PET sintered filter layer 422 of the filter layer 42 and the inner bottom of the accommodation cavity 31. Six air intake holes 61 are formed on the sound-absorbing film 6, three of the air intake holes 61 are located at one air suction port 311, and the other three air intake holes 61 are located at the other air suction port 311. The sound-absorbing film 6 can further reduce the noise generated at the suction pipe of the compressor, effectively reducing the noise of the whole machine. Under the action of the suction force of the compressor and the fan 2, the air flow can sequentially pass through the connecting pipe 51, the inserted connecting pipe 511, the air pipe 12, the intake pipe 32, the through hole 413, the filter layer 42, and the air intake holes 61 on the sound-absorbing film 6 and enter the air suction port 311.

[0062] Refer to Figure 2 , in this embodiment, a circular convex edge 431 is formed on the end surface of the cover body 43. The shape of the convex edge 431 is adapted to the inner wall shape of the protrusion 412 on the filter plate 41. The cross-sectional area of the space surrounded by the circumferential wall of the convex edge 431 is smaller than the cross-sectional area of the space surrounded by the circumferential wall of the protrusion 412. When the cover body 43 is closed at the opening of the accommodation cavity 31, the convex edge 431 is inserted between the protrusion 412 and the boss 414 on the filter plate 41, which can further prevent air leakage. At the same time, the wall of the convex edge 431 at the through hole 413 is thinner to ensure that the convex edge 431 does not block the through hole 413, so as not to affect the flow of air through the through hole 413 to the space between the filter layer 42 and the cover body 43.

[0063] Refer to Figures 1 to 5, for the air path structure of the portable oxygen generator of the present invention, the compressor 7 of the oxygen generator is installed in the space enclosed by the cover 1 and the base 3. The two suction pipes on the compressor 7 are respectively inserted into the two suction ports 311 on the base 3. When the compressor 7 and the fan 2 are working, under the suction of the compressor 7 and the blowing of the fan 2, a part of the air flow blown out from the air outlet 21 of the fan 2 is used to dissipate heat from the compressor 7 in the cover 1, and the other part passes through the connecting pipe 51, the inserted pipe 511 on the sealing member 5, the air pipe 12 on the side wall of the cover 1, the air inlet pipe 32 on the base 3, the through hole 413 on the filter plate 41, the filter layer 42, the air inlet hole 61 on the sound insulation film 6, and the suction port 311 and enters the suction pipe of the compressor 7. The fan 2 combined with the suction of the compressor 7 itself can improve the suction efficiency of the compressor 7, ensure the air intake volume of the compressor 7, and make the air intake of the compressor 7 smoother. Moreover, the noise generated by the suction of the compressor 7 can be effectively superimposed with the noise generated by the fan 2, which not only reduces the noise source but also can reduce the total noise volume. In addition, the air path for the compressor 7 to intake air is composed of the air inlet pipe 32 on the base 3 and the air pipe 12 on the cover 1, which can reduce the pipeline connection in the oxygen generator. While reducing the pipelines, it can effectively reduce the noise of the whole machine and also effectively reduce the occupied space inside the portable oxygen generator, providing the possibility for the further miniaturization of the portable oxygen generator. At the same time, the sealing member 5 can seal the gap between the air outlet 21 of the fan 2 and the opening 11 on the cover 1, effectively sealing the noise generated by the operation of the compressor 7 inside the cover 1, thereby effectively reducing the noise of the whole machine.

[0064] The above are only some embodiments of the present invention, aiming to illustrate the technical means of the present invention and not to limit the technical scope of the present invention. Obvious improvements made by those skilled in the art in combination with the existing well-known common sense fall within the protection scope of the present invention.

Claims

1. A gas path structure for taking air from a compressor of a portable oxygen concentrator, characterized in that: include: A cover body for covering the compressor, wherein the top of the cover body is provided with an opening, and the side wall of the cover body is provided with an air pipe; A fan is provided at the opening, an air outlet of the fan is communicated with the interior of the cover, and one end of the air pipe is communicated with the air outlet of the fan; A base, wherein a receiving chamber and an air inlet pipe are provided on the base, an air inlet for plugging the air inlet pipe on the compressor is provided on the inner bottom of the receiving chamber, the cover body is arranged on the base, the other end of the air pipe is connected to one end of the air inlet pipe, and the other end of the air inlet pipe is connected to the receiving chamber; and A filter assembly is accommodated in the accommodating cavity. Under the action of the fan, the air flow can enter the air intake through the air pipe, the air intake pipe, and the filter component in sequence.

2. The gas path structure according to claim 1, characterized in that: It also includes a sealing member, which is arranged between the air outlet and the opening of the fan. A connecting pipe is provided on the side of the sealing member, one end of the connecting pipe is connected to one end of the air pipe, and the other end of the connecting pipe is connected to the air outlet of the fan. A receiving groove is provided on the top of the cover body, and the connecting pipe is received in the receiving groove.

3. The gas path structure according to claim 2, characterized in that: An inclined portion is provided at the bottom of one side of the seal, and two downwardly extending stoppers are provided at the bottom of the seal. The two stoppers are respectively located on both sides of the inclined portion and are respectively connected to both sides of the inclined portion. The port at the other end of the connecting pipe is located at the intersection of the inclined portion and one stopper.

4. The gas path structure according to claim 2, characterized in that: A clamping groove is arranged around the opening, a clamping step matched with the clamping groove is arranged around the sealing member, and the clamping step on the sealing member is clamped in the clamping groove around the opening.

5. The gas path structure according to claim 2, characterized in that: One end of the connecting pipe is provided with a plug-in pipe communicated with the connecting pipe, and the plug-in pipe is plugged into the trachea.

6. The gas path structure according to any one of claims 2 to 5, characterized in that: The sealing element is made of rubber or silicone.

7. The gas path structure according to claim 1, characterized in that: The filter assembly includes a filter plate, a filter layer and a cover body. A mounting hole is provided in the middle of the filter plate. The filter layer is arranged on the filter plate to cover the mounting hole. The filter plate is accommodated in the accommodating cavity and the filter layer covers the air inlet. The cover body covers the opening of the accommodating cavity to cover the accommodating cavity.

8. The gas path structure according to claim 7, characterized in that: The filter plate is provided with a circle of protrusions around it, a through hole connected to the other end of the air inlet pipe is provided on the filter plate, a circle of bosses is provided around the mounting hole, a circle of grooves is provided on the inner wall of the bosses, and the periphery of the filter layer is clamped in the grooves.

9. The gas path structure according to claim 8, characterized in that: The height of the protrusion is higher than that of the boss.

10. The gas path structure according to claim 8, characterized in that: It also includes a sound-absorbing membrane, which is arranged on the inner bottom of the accommodating cavity to cover the air inlet, and the sound-absorbing membrane is provided with an air inlet hole, and the sound-absorbing membrane is located between the filter layer and the inner bottom of the accommodating cavity. Under the action of the fan, the air flow can enter the air intake port through the air pipe, the air intake pipe, the through hole, the filter layer, and the air intake hole on the sound-absorbing membrane in sequence.

Images