Vehicle-mounted aromatherapy machine

Abstract

The utility model discloses a vehicle-mounted aromatherapy machine which comprises a shell, an air pump, a connecting cover assembly, a bottle body and an air outlet assembly, the air pump, the connecting cover assembly, the bottle body and the air outlet assembly are all arranged in the shell. The connecting cover assembly comprises a connecting cover body and an air blowing pipe, the connecting cover body comprises a cover body and a flow dividing piece, the bottle body is covered with the cover body, and an air inlet is formed in the side wall of the cover body and communicated with an air pump; an air outlet channel is formed in the cover body and is communicated with the air inlet and the bottle body respectively; the flow dividing piece is arranged in the air outlet channel, a first air blowing opening and a second air blowing opening are formed in the flow dividing piece, and the first air blowing opening and the second air blowing opening communicate with the air inlet; the first blowing port is connected with one end of a blowing pipe, and the other end of the blowing pipe extends into the bottle body; the second air blowing port is positioned above the bottle body and is communicated with the air outlet channel; the air outlet assembly is connected to the end, away from the bottle body, of the cover body and communicates with the air outlet channel, and one end of the air outlet assembly is exposed out of the shell.

Description

Technical Field

[0001] This utility model relates to the field of car air freshener technology, specifically to a car air freshener machine. Background Technology

[0002] Car air fresheners are often used to regulate the air in a space, eliminate odors, keep people alert and calm, and create a fresh atmosphere.

[0003] Existing car air fresheners typically consist of an air pump and a bottle. The bottle contains fragrance liquid, and the air pump blows air into the liquid through a tube, creating bubbles. These bubbles burst, releasing gas that is expelled from the bottle through the tube, thus diffused the fragrance. However, while the bursting bubbles produce fragrant gas, they also produce water vapor. This water vapor, carried by the expelled gas, can pollute the car. Utility Model Content

[0004] To address the shortcomings of existing technologies, a car-mounted aroma diffuser is provided.

[0005] To achieve the above objectives, this utility model provides a car air freshener, including a housing, an air pump, a connecting cover assembly, a bottle, and an air outlet assembly. The air pump, connecting cover assembly, bottle, and air outlet assembly are all housed within the housing. The connecting cover assembly includes a connecting cover body and an air blowing pipe. The connecting cover body includes a cover and a diverter. The cover is placed over the bottle, and an air inlet is provided on the side wall of the cover, which is connected to the air pump. An air outlet channel is formed within the cover, which is connected to both the air inlet and the bottle. The diverter is located within the air outlet channel and has a first air blowing port and a second air blowing port, which are connected to the air inlet. The first air blowing port is connected to one end of the air blowing pipe, and the other end of the air blowing pipe extends into the bottle. The second air blowing port is located above the bottle and is connected to the air outlet channel. The air outlet assembly is connected to the end of the cover away from the bottle, and is connected to the air outlet channel. One end of the air outlet assembly is exposed outside the housing.

[0006] According to one embodiment of the present invention, the connecting cover assembly further includes a spiral blocking member, which is disposed in the air outlet channel and located above the diverter. A spiral channel is formed in the spiral blocking member. The spiral channel is connected to the air outlet channel and the air outlet assembly respectively.

[0007] According to one embodiment of the present invention, baffles are respectively provided at both ends of the spiral channel, and there is a gap between the baffles and the inner wall of the spiral blocking member.

[0008] According to one embodiment of the present invention, the connecting cover assembly further includes an air vent cover, which is disposed on one end of the cover body and has an exhaust port connected to the air vent assembly.

[0009] According to one embodiment of the present invention, the air outlet component includes an air outlet pipe, which includes a first pipe and a second pipe. One end of the first pipe is connected to an exhaust port, and the other end is connected to the second pipe. The height H of the end of the first pipe connected to the exhaust port relative to the bottom of the housing is less than the height H of the end of the first pipe connected to the second pipe relative to the bottom of the housing.

[0010] According to one embodiment of the present invention, the inner diameter of the air outlet channel gradually decreases along the direction that gradually approaches the bottom of the bottle.

[0011] According to one embodiment of the present invention, a sealing connector is further included. The sealing connector includes a first connector, a second connector, and a sealing member. The bottom end of the first connector is snapped into the housing. The two opposite sides of the first connector and the second connector are respectively provided with grooves. After the first connector and the second connector are fastened together, the grooves are fastened together to form an accommodating space. The sealing member is disposed in the accommodating space. The first connector has a first connecting end and a second connecting end. The second connector has a third connecting end and a fourth connecting end. The sealing member has two sealing connecting terminals. The two ends of one sealing terminal are respectively connected to the first connecting end and the third connecting end. The two ends of the other sealing connecting terminal are respectively connected to the second connecting end and the fourth connecting end. The first connecting end is connected to the air outlet assembly. The third connecting end is connected to the exhaust port. The second connecting end is connected to the air pump through a pipe. The fourth connecting end is connected to the air inlet.

[0012] According to one embodiment of the present invention, the housing includes a base, a front cover, a rear cover, and a bracket. The base includes a bottom plate and a partition plate. The partition plate divides the bottom plate into a first mounting area and a second mounting area. The air pump is located in the first mounting area, and the bottle is located in the second mounting area. The bracket has a snap-fit ​​interface, and one end of the cover that is connected to the bottle is snapped into the snap-fit ​​interface. The front cover covers the first mounting area, and the rear cover covers the top of the connecting cover assembly, and the rear cover is snapped into the bracket.

[0013] According to one embodiment of the present invention, it also includes a heating element, which is arranged in a ring around the outside of the air outlet pipe.

[0014] According to one embodiment of the present invention, it also includes a one-way valve, which is connected to the end of the air outlet pipe away from the cover, and the other end of the one-way valve is exposed outside the housing.

[0015] The beneficial effect of this utility model is that, by setting a flow divider, the airflow generated by the air pump is discharged through the first air outlet and the second air outlet respectively. The airflow blown out through the first air outlet causes the fragrance liquid in the bottle to generate bubbles, and the airflow blown out through the second air outlet blocks the water vapor from moving upward, thereby preventing the water vapor from being discharged outward. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is an exploded view of the car-mounted aroma diffuser in the embodiment;

[0018] Figure 2 This is a cross-sectional view of the car air freshener in the embodiment;

[0019] Figure 3 This is a cross-sectional view of the connecting cover body in the embodiment;

[0020] Figure 4 This is a schematic diagram of the spiral blocking component in the embodiment;

[0021] Figure 5 This is a schematic diagram of the air outlet pipe in the embodiment;

[0022] Figure 6 This is an exploded view of the sealing connector in the embodiment.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Housing; 11. Base; 111. Base plate; 112. Partition; 1111. First mounting area; 1112. Second mounting area; 12. Front cover; 13. Rear cover; 14. Bracket; 140. Snap-fit ​​interface; 2. Air pump; 3. Connecting cover assembly; 31. Connecting cover body; 311. Cover body; 3110. Air inlet; 312. Diverter; 3120. First air outlet; 3121. Second air outlet; 310. Air outlet channel; 32. Spiral blocking component 321. Baffle plate; 322. Gap; 33. Vent cap; 330. Vent port; 4. Bottle body; 5. Vent assembly; 51. Vent pipe; 511. First pipe; 512. Second pipe; 6. Sealing connector; 61. First connector; 611. First connecting end; 612. Second connecting end; 62. Second connector; 621. Third connecting end; 622. Fourth connecting end; 63. Seal; 631. Sealing connection terminal; 7. One-way valve. Detailed Implementation

[0025] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0026] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0027] Please refer to Figures 1-3 , Figure 1 This is an exploded view of a car air freshener. Figure 2 This is a cross-sectional view of a car air freshener. Figure 3 This is a cross-sectional view of the connecting cover body. This embodiment provides a car air freshener, including a housing 1, an air pump 2, a connecting cover assembly 3, a bottle 4, and an air outlet assembly 5. The air pump 2, connecting cover assembly 3, bottle 4, and air outlet assembly 5 are all disposed within the housing 1. The air pump 2 generates gas. The connecting cover assembly 3 is connected to and communicates with the air pump 2. The bottle 4 holds the fragrance liquid and is connected to and communicates with the connecting cover assembly 3. The air outlet assembly 5 allows the fragrant gas to diffuse outwards from the car air freshener and is communicated with the connecting cover assembly 3. The gas generated by the air pump 2 is blown into the bottle 4 through the connecting cover assembly 3. The gas carrying the fragrance flows from the bottle 4 into the connecting cover assembly 3, then from the connecting cover assembly 3 into the air outlet assembly 5, and finally exits from the air outlet assembly 5.

[0028] The connecting cap assembly 3 includes a connecting cap body 31 and an air blowing pipe. The connecting cap body 31 includes a cap 311 and a flow divider 312. The cap 311 is placed on the bottle 4. An air inlet 3110 is provided on the side wall of the cap 311, which is connected to the air pump 2. An air outlet channel 310 is formed inside the cap 311, which is connected to both the air inlet 3110 and the bottle 4. The flow divider 312 is located within the air outlet channel 310 and has a first air blowing port 3120 and a second air blowing port 3121. The air inlet 3110 is connected to the air pump 2, the first air blowing port 3120, and the second air blowing port 3121. One end of the air blowing pipe is connected to the first air blowing port 3120, and the other end of the air blowing pipe extends into the bottle 4. The second air outlet 3121 is located above the bottle body 4 and communicates with the air outlet channel 310. The air outlet component 5 is connected to the end of the cap 311 away from the bottle body 4, and the air outlet component 5 is connected to the air outlet channel 310. One end of the air outlet component 5 is exposed outside the shell 1.

[0029] In actual use, the air pump 2 is turned on, causing it to blow air through the pipe into the air inlet 3110 of the cover 311. The airflow enters the cover 311 through the air inlet 3110 and then enters the diverter 312. The airflow is then discharged from the first air outlet 3120 and the second air outlet 3121 of the diverter 312. The airflow from the first air outlet 3120 is blown through the air pipe towards the fragrance liquid in the bottle 4, causing the fragrance liquid to continuously generate bubbles. After the bubbles burst, the fragrant gas flows through the air outlet channel 310 to the location of the air outlet component 5. As the bubbles burst, the fragrance gas carries some moisture out through the air outlet 310. At the same time, the second air outlet 3121, located above the bottle body 4 and connected to the air outlet 310, continuously blows air into the air outlet 310 above the bottle body 4, blocking the moisture carried in the fragrance gas and preventing the moisture from moving upward, thus preventing the moisture from being discharged into the interior space of the car. The fragrance gas is then released upward from the air outlet 310 and diffuses outward through the air outlet component 5, thereby achieving a fragrance diffusion effect.

[0030] In this embodiment, by setting the diverter 312, the airflow generated by the air pump 2 is discharged through the first air outlet 3120 and the second air outlet 3121 respectively. The airflow blown out through the first air outlet 3120 causes the aromatherapy liquid in the bottle 4 to generate bubbles, and the airflow blown out through the second air outlet 3121 blocks the water vapor from moving upward, thereby preventing the water vapor from being discharged outward.

[0031] Please refer to Figure 1 , Figure 2 and Figure 4 , Figure 4 This is a schematic diagram of the spiral blocking component. Furthermore, the connecting cover assembly 3 also includes a spiral blocking component 32. The spiral blocking component 32 is disposed within the air outlet channel 310 and is located above the flow divider 312. A spiral channel is formed within the spiral blocking component 32, and a baffle 321 is provided within the spiral channel. The spiral channel is connected to both the air outlet channel 310 and the air outlet assembly 5.

[0032] The fragrant gas diffuses upwards from the exhaust channel 310, then enters the spiral channel, passes through the spiral channel into the exhaust assembly 5, and is then discharged from the exhaust assembly 5 outside the car air freshener. When the car air freshener tilts or encounters a bump, the fragrance liquid in the bottle 4 flows into the spiral channel through the exhaust channel 310. By setting the spiral channel in a spiral upward shape, the flow rate of the fragrance liquid is effectively slowed down, preventing the fragrance liquid from flowing directly back into the exhaust assembly and preventing the fragrance liquid from flowing out of the car air freshener.

[0033] In addition, baffles 321 are provided at both ends of the spiral channel, and there is a gap 322 between the baffles 321 and the spiral blocking member 32. The baffles 321 are used to block the ports at both ends of the spiral channel to prevent the aromatherapy liquid in the bottle 4 from flowing into the spiral channel through the air outlet channel 310 when the car air diffuser tipps over or encounters bumps. The gap 322 between the baffles 321 and the spiral blocking member 32 allows the fragrance gas to escape, thereby achieving the effect of air passage and liquid blockage.

[0034] Furthermore, the connecting cover assembly 3 also includes an exhaust cover 33, which is located on one end of the cover body 311. The exhaust cover 33 has an exhaust port 330, which is connected to the exhaust assembly 5. In this example, the exhaust cover 33 is threaded to one end of the cover body 311, and is used to connect the exhaust assembly 5 and the cover body 311. In use, the fragrance gas generated inside the bottle 4 passes through the exhaust channel 310 and the spiral channel in sequence before entering the exhaust cover 33. Then, it enters the exhaust assembly 5 from the exhaust port 330 of the exhaust cover 33, and finally exits the car air freshener from the exhaust assembly 5.

[0035] The air outlet assembly 5 includes an air outlet pipe 51, one end of which is connected to the exhaust port 330, and the other end is exposed outside the housing 1.

[0036] After the fragrant gas is discharged from the exhaust channel 310, it passes through the exhaust port 330 of the exhaust cover 33 and then through the exhaust pipe 51 to the outside of the housing 1. In this example, the fragrant gas is generated in the bottle 4, then diffuses upward through the exhaust channel 310, flows through the spiral channel and enters the exhaust cover 33, and then passes through the exhaust pipe 51 from the exhaust port 330 and is discharged outside the car air freshener along the exhaust pipe 51.

[0037] Please provide a reference. Figure 5 , Figure 5 This is a schematic diagram of the air outlet pipe. Further, the air outlet pipe 51 includes a first pipe 511 and a second pipe 512. One end of the first pipe 511 is connected to the exhaust port 330, and the other end of the first pipe 511 is connected to one end of the second pipe 512, with the other end of the second pipe 512 exposed outside the housing 1. Furthermore, the height H1 of the end of the first pipe 511 connected to the exhaust port 330 relative to the bottom of the housing 1 is less than the height H2 of the end of the first pipe 511 connected to the second pipe 512 relative to the bottom of the housing 1, thus causing the height of the first pipe 511 to gradually increase along the direction gradually away from the exhaust port 330. If water is discharged from the exhaust port 330 into the air outlet pipe 51, by tilting the first pipe 511, the water flow cannot be discharged from the first pipe 511 to the second pipe 512 under the action of gravity, thereby effectively preventing liquid from being discharged outside the car air freshener.

[0038] In addition, in this example, the inner diameter of the air outlet channel 310 gradually decreases as it approaches the bottom of the bottle 4. If the car air diffuser tipps over during use, causing the fragrance liquid in the bottle 4 to enter the guide channel, the air outlet channel 310 is designed in a funnel shape, making it difficult for the fragrance liquid to enter the air outlet channel 310. Furthermore, if the fragrance liquid does enter the air outlet channel 310, it can quickly flow back into the bottle 4 after gathering through the air outlet channel 310.

[0039] Please refer to Figure 1 , Figure 2 and Figure 6 , Figure 6 This is an exploded view of the sealing connector. Further, the car air freshener also includes a sealing connector 6. Specifically, the sealing connector 6 includes a first connector 61, a second connector 62, and a seal 63. During installation, one end of the first connector 61 is engaged with the housing 1, ensuring the sealing connector 6 remains stable relative to the housing 1. The second connector 62 is engaged with the first connector 61, connecting the two connectors. Grooves are respectively formed on opposite sides of the first connector 61 and the second connector 62, so that after the first connector 61 and the second connector 62 are engaged, the grooves also engage to form a receiving space, in which the seal 63 is disposed. The first connector 61 has a first connecting end 611 and a second connecting end 612, and the second connector 62 has a third connecting end 621 and a fourth connecting end 622. The first connecting end 611 corresponds to the third connecting end 621, and the second connecting end 612 corresponds to the fourth connecting end 622. The seal 63 has two sealing connection terminals 631. One sealing connection terminal 631 has two ends connected to the first connection terminal 611 and the third connection terminal 621, respectively. The other sealing connection terminal 631 has two ends connected to the second connection terminal 612 and the fourth connection terminal 622, respectively. During connection, the first connection terminal 611 is connected to the air outlet assembly 5, the third connection terminal 621 is connected to the exhaust port 330, the second connection terminal 612 is connected to the air pump 2 through a pipe, and the fourth connection terminal 622 is connected to the air inlet 3110.

[0040] Thus, the air pump 2 is sealed to the connecting cover body 31 through the sealing connector 6, and the air outlet assembly 5 is sealed to the exhaust port 330 of the air outlet cover 33 through the sealing connector 6, which effectively improves the sealing performance of the car air freshener. At the same time, the sealing connector 6 provides support for the air outlet assembly 5 and the pipe connected to the air pump 2.

[0041] The car air freshener in this example also includes a heating element (not shown in the figure), which is arranged around the outside of the air outlet pipe 51. The heating element is used to heat the air outlet pipe 51 to prevent condensation from forming in the air outlet pipe 51 when the car air freshener is in a low-temperature state.

[0042] Furthermore, the car air freshener also includes a one-way valve 7, which is located at the end of the air outlet pipe 51 away from the air outlet cover 33, and the end of the one-way valve 7 away from the air outlet pipe 51 is exposed outside the housing 1. When the car air freshener is turned on, the one-way valve 7 opens, and the fragrant gas is discharged from the air outlet pipe 51 through the one-way valve 7; when the car air freshener is turned off, the one-way valve 7 closes, and external gas cannot enter the car air freshener through the one-way valve 7, thus effectively preventing cross-contamination of odors.

[0043] The housing 1 includes a base 11, a front cover 12, a rear cover 13, and a bracket 14. The base 11 includes a base plate 111 and a partition 112, which divides the base plate 111 into a first mounting area 1111 and a second mounting area 1112. The air pump 2 is installed in the first mounting area 1111, and the bottle body 4 and the connecting cap assembly 3 are located in the second mounting area 1112. The bracket 14 has a snap-fit ​​interface 140, and one end of the cover 311 connected to the bottle body 4 is snapped into the snap-fit ​​interface 140. The front cover 12 covers the first mounting area 1111 to cover the air pump 2 and the second air outlet assembly 5. The rear cover 13 covers the connecting cap assembly 3 and is snapped into the bracket 14, ensuring a secure connection between the rear cover 13 and the bracket 14.

[0044] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A car aromatherapy machine, characterized in that, The utility model relates to a bottle type air pump, including: Shell (1), air pump (2), connecting cover subassembly (3), bottle body (4) and air outlet subassembly (5), air pump (2), connecting cover subassembly (3), bottle body (4) and air outlet subassembly (5) all are located in shell (1) inside, connecting cover subassembly (3) includes connecting cover body (31) and blow pipe, connecting cover body (31) includes cover (311) and shunt (312), cover (311) cover is located in bottle body (4), the side wall of cover (311) is equipped with air inlet (3110), air inlet (3110) is linked with air pump (2) communication, the inside of cover (311) forms air outlet channel (310), air outlet channel (310) is linked with air inlet (3110) and bottle body (4) communication respectively, shunt (312) is located in air outlet channel (310), shunt (312) is equipped with first blow air port (3120) and second blow air port (3121), first blow air port (3120) and second blow air port (3121) are linked with air inlet (3110) communication respectively, first blow air port (3120) connects one end of blow pipe, the other end of blow pipe is inserted into bottle body (4), second blow air port (3121) is located above bottle body (4) and is communicated with air outlet channel (310), air outlet subassembly (5) is connected to the one end of cover (311) away from bottle body (4), air outlet subassembly (5) is communicated with air outlet channel (310), one end of air outlet subassembly (5) is exposed to shell (1).

2. The car aromatherapy machine according to claim 1, characterized in that, Connecting cover subassembly (3) still includes spiral block (32), spiral block (32) is located in air outlet channel (310), spiral block (32) is located above shunt (312), spiral channel is formed in spiral block (32), spiral channel is communicated with air outlet channel (310) and air outlet subassembly (5) respectively.

3. The car aromatherapy machine according to claim 2, characterized in that, The both ends of spiral channel are provided with baffle (321) respectively, and there is gap (322) between baffle (321) and the inner wall of spiral block (32).

4. The car aromatherapy machine according to claim 1, characterized in that, Connecting cover subassembly (3) still includes air outlet cover (33), air outlet cover (33) cover is located in one end of cover (311), air outlet cover (33) is equipped with exhaust port (330), exhaust port (330) is linked with air outlet subassembly (5).

5. The car aromatherapy machine according to claim 4, characterized in that, Air outlet subassembly (5) includes air outlet pipeline (51), air outlet pipeline (51) includes first pipeline (511) and second pipeline (512), one end of first pipeline (511) is connected exhaust port (330), and the other end is connected second pipeline (512), the height H1 of the one end of first pipeline (511) connected with exhaust port (330) relative to the bottom of shell (1) is less than the height H2 of the one end of first pipeline (511) connected with second pipeline (512) relative to the bottom of shell (1).

6. The car aromatherapy machine according to claim 1, characterized in that, The inner diameter of the air outlet passage (310) gradually decreases in a direction gradually approaching the bottom of the bottle body (4).

7. The car aromatherapy machine according to claim 4, characterized in that, The sealing connector (6) comprises a first connector (61), a second connector (62), and a sealing member (63). The bottom end of the first connector (61) is clamped to the shell (1). The opposite surfaces of the first connector (61) and the second connector (62) are respectively provided with grooves. The grooves are mutually buckled to form an accommodation space after the first connector (61) and the second connector (62) are buckled. The sealing member (63) is arranged in the accommodation space. The first connector (61) has a first connecting end (611) and a second connecting end (612). The second connector (62) has a third connecting end (621) and a fourth connecting end (622). The sealing member (63) has two sealing connecting terminals (631). One of the two sealing connecting terminals (631) is in communication with the first connecting end (611) and the third connecting end (621) at both ends, respectively. The other of the two sealing connecting terminals (631) is in communication with the second connecting end (612) and the fourth connecting end (622) at both ends, respectively. The first connecting end (611) is in communication with the air outlet assembly (5). The third connecting end (621) is connected to the air outlet (330). The second connecting end (612) is connected to the air pump (2) through a pipeline. The fourth connecting end (622) is connected to the air inlet (3110).

8. The car aromatherapy machine according to claim 1, characterized in that, The shell (1) comprises a base (11), a front cover (12), a rear cover (13), and a support (14). The base (11) comprises a bottom plate (111) and a partition plate (112). The partition plate (112) separates the bottom plate (111) into a first installation area (1111) and a second installation area (1112). The air pump (2) is located in the first installation area (1111). The bottle body (4) is arranged in the second installation area (1112). The support (14) is provided with a clamping port (140). One end of the cover body (311) connected to the bottle body (4) is clamped in the clamping port (140). The front cover (12) covers the first installation area (1111). The rear cover (13) covers the top of the connecting cover assembly (3). The rear cover (13) is clamped to the support (14).

9. The car aromatherapy machine according to claim 5, characterized in that, The heating sheet is annularly arranged outside the air outlet pipeline (51).

10. The car aromatherapy machine according to claim 5, characterized in that, The one-way valve (7) is connected to one end of the air outlet pipeline (51) away from the cover body (311). The other end of the one-way valve (7) is exposed to the shell (1).

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