Air cushion bed air pressure adjustment control device

Abstract

An air pressure adjustment and control device for an air mattress includes a lower cover and a turntable. The lower cover has multiple first air inlets, multiple second air inlets, a first air outlet, a second air outlet, a third air outlet, a fourth air outlet, and a fifth air outlet. The first, second, third, fourth, and fifth air outlets are respectively connected to a tubular air bladder. The turntable is disposed on the lower cover. One side of the turntable has three first flow channels, a second flow channel, and a vent hole. The second flow channel is connected to the first air inlet, allowing air input from the first air inlet to be delivered to the second flow channel. The device can drive the turntable to rotate, so that the first flow channel, second flow channel, and vent hole of the turntable can selectively correspond to the first, second, third, fourth, and fifth air outlets. Therefore, the air pressure of five tubular airbags can be adjusted and controlled by a single valve body, which can play the role of alternating inflation and deflation. When any one of the tubular airbags deflates, the other tubes remain inflated and are not affected by the alternating air pump.

Description

Technical Field

[0001] This utility model relates to an air pressure adjustment and control device, and more particularly to an air pressure adjustment and control device applied to an air mattress. Background Technology

[0002] Air mattresses are widely used by elderly people or patients who are bedridden for extended periods. Existing air mattresses offer alternating inflation and deflation functions, allowing for a more even distribution of pressure on the bedridden person's body and preventing sustained pressure on specific areas, thus improving bedsores. The main body of an air mattress consists of multiple tubular air bladders, which can be inflated alternately using an electric air pump to achieve alternating inflation and deflation, preventing sustained pressure on specific skin areas. However, existing air pressure control devices require separate control valves for each tubular air bladder, resulting in a complex overall structure and inconvenient operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an air pressure adjustment and control device for an air mattress, which can alternately inflate and deflate to achieve selective pressure reduction, and can simplify the overall structure, effectively reduce costs, and facilitate operation and use.

[0004] To solve the above-mentioned technical problems, this utility model provides an air mattress air pressure adjustment control device for controlling a tubular airbag group at the end of the air mattress. The tubular airbag group includes a first tubular airbag, a second tubular airbag, a third tubular airbag, a fourth tubular airbag, and a fifth tubular airbag. The air mattress air pressure adjustment control device includes: a lower cover, the lower cover having multiple first air inlets, multiple second air inlets, a first air outlet, a second air outlet, a third air outlet, a fourth air outlet, and a fifth air outlet. The first air outlet, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet are respectively connected to the first tubular airbag, the second tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag. The second air inlet is connected to an air pump; and a turntable is disposed on the lower cover and is rotatable on the lower cover. One side of the turntable has three first flow channels, one second flow channel, and one vent hole. The three first flow channels are located outside the center of the turntable, and the second flow channel is close to the edge of the turntable. The second flow channel is connected to at least two of the plurality of first air inlets, so that air input from the first air inlets can be delivered to the second flow channel. The vent hole is connected to the outside of the turntable. The turntable can be driven to rotate so that the three first flow channels, the second flow channel, and the vent hole of the turntable can selectively correspond to the first air outlet, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet for alternating inflation, deflation, and pressure equalization operations.

[0005] Optionally, the number of the plurality of first air inlets is three, and the plurality of first air inlets are spaced apart; the number of the plurality of second air inlets is three, and the plurality of second air inlets are spaced apart.

[0006] Optionally, the turntable is connected to a driving device, which can be a mechanical device, an electronic device, a pneumatic device, or a manual device.

[0007] Optionally, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, and then respectively transported to the second tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag to maintain pressure equalization. The first air outlet is opposite to the vent hole, so that the first tubular airbag can be deflated.

[0008] Optionally, the first air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, and then respectively transported to the first tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag to maintain pressure equalization, and the second air outlet is opposite to the vent hole, so that the second tubular airbag can be deflated.

[0009] Optionally, the first air outlet, the second air outlet, the fourth air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the fourth air outlet, and the fifth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the fourth tubular airbag, and the fifth tubular airbag to maintain pressure equalization, and the third air outlet is opposite to the vent hole, so that the third tubular airbag can be deflated.

[0010] Optionally, the first air outlet, the second air outlet, the third air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the third air outlet, and the fifth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the third tubular airbag, and the fifth tubular airbag to maintain pressure equalization, and the fourth air outlet is opposite to the vent hole, so that the fourth tubular airbag can be deflated.

[0011] Optionally, the first air outlet, the second air outlet, the third air outlet, and the fourth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the third air outlet, and the fourth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the third tubular airbag, and the fourth tubular airbag to maintain pressure equalization, and the fifth air outlet is opposite to the vent hole, so that the fifth tubular airbag can be deflated.

[0012] Optionally, the plurality of second air inlets are respectively connected to the plurality of first flow channels, and the first air outlet and the fourth air outlet are connected to the first flow channels, the second air outlet and the fifth air outlet are connected to another first flow channel, and the third air outlet is connected to yet another first flow channel, so that the air input by the plurality of second air inlets is respectively transported through the plurality of first flow channels to the first air outlet, the second air outlet, the third air outlet, the fourth air outlet and the fifth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the third tubular airbag, the fourth tubular airbag and the fifth tubular airbag, and can perform alternating operation of the first tubular airbag, the fourth tubular airbag and the second tubular airbag, the fifth tubular airbag.

[0013] Optionally, an airtight gasket is provided between the lower cover and the turntable. The airtight gasket has multiple perforations, which correspond to the multiple first air inlets, the multiple second air inlets, the first air outlet, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, respectively.

[0014] The beneficial effects of this invention are as follows: The air pressure adjustment and control device for the air mattress provided by this invention can adjust and control the air pressure of five tubular airbags (foot tubes) with a single valve body. It can perform one deflation and multiple pressure equalization operations, and can achieve alternating inflation and deflation functions to selectively reduce pressure, avoid continuous pressure on local skin, and effectively prevent bedsores. Furthermore, this invention can simultaneously control the air pressure of multiple tubular airbags, which simplifies the overall structure, effectively reduces costs, and facilitates operation and use. When any single tubular airbag deflates, the other tubes can remain inflated (static), unaffected by alternating air pump operation.

[0015] To further understand the features and technical content of this utility model, please refer to the following detailed description and drawings of this utility model. However, the drawings are provided for reference and illustration only and are not intended to limit this utility model. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an air mattress according to an embodiment of the present invention.

[0017] Figure 2 This is an exploded perspective view of the air pressure adjustment control device according to an embodiment of the present invention.

[0018] Figure 3 This is an exploded perspective view of the air pressure adjustment control device according to another embodiment of the present invention.

[0019] Figure 4This is a schematic diagram (I) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0020] Figure 5 for Figure 4 A schematic diagram of the tubular airbag assembly in use.

[0021] Figure 6 This is a schematic diagram (II) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0022] Figure 7 for Figure 6 A schematic diagram of the tubular airbag assembly in use.

[0023] Figure 8 This is a schematic diagram (III) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0024] Figure 9 for Figure 8 A schematic diagram of the tubular airbag assembly in use.

[0025] Figure 10 This is a schematic diagram (four) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0026] Figure 11 for Figure 10 A schematic diagram of the tubular airbag assembly in use.

[0027] Figure 12 This is a schematic diagram (V) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0028] Figure 13 for Figure 12 A schematic diagram of the tubular airbag assembly in use.

[0029] Figure 14 This is a schematic diagram (six) showing the operating state of the air pressure adjustment control device according to an embodiment of this utility model.

[0030] Figure 15 for Figure 14 A schematic diagram of the tubular airbag assembly in use.

[0031] Figure 16 This is a schematic diagram of the air mattress control according to an embodiment of the present invention. Detailed Implementation

[0032] [Example]

[0033] Please see Figure 1This utility model provides an air mattress air pressure adjustment and control device for controlling a tubular airbag assembly 100 at the end of the air mattress. The tubular airbag assembly 100 corresponds to the user's legs. The tubular airbag assembly 100 includes a first tubular airbag 101, a second tubular airbag 102, a third tubular airbag 103, a fourth tubular airbag 104, and a fifth tubular airbag 105, arranged sequentially. Air mattresses typically have multiple tubular airbags, which can be categorized, for example, as tubular airbags A, B, C, etc. Figure 1 and Figure 16 As shown, when tubular airbags A and B are inflated, tubular airbag C deflates. Then tubular airbags B and C are inflated while tubular airbag A deflates. Then tubular airbags C and A are inflated while tubular airbag B deflates. This cycle repeats. Since alternating inflation of air mattresses is existing technology, it will not be described in detail.

[0034] Please see Figure 2 and Figure 3 The air mattress air pressure adjustment control device includes a lower cover 1 and a turntable 3. The lower cover 1 may be circular and has multiple first air inlets 11, multiple second air inlets 12, a first air outlet 13, a second air outlet 14, a third air outlet 15, a fourth air outlet 16, and a fifth air outlet 17. In this embodiment, there are three first air inlets 11, and the multiple first air inlets 11 are arranged at intervals. In this embodiment, there are three second air inlets 12, spaced apart to correspond to the first flow channel 32. These second air inlets 12 are located between the center and edge of the lower cover 1. Multiple first air outlets 13, second air outlets 14, third air outlets 15, fourth air outlets 16, and fifth air outlets 17 can be connected via pipes to the first tubular airbag 101, second tubular airbag 102, third tubular airbag 103, fourth tubular airbag 104, and fifth tubular airbag 105, respectively. The lower cover 1 in this embodiment has five air inlets and five air outlets, but the number of air inlets and outlets is not limited and can vary depending on the number of tubular airbags. Multiple first air inlets 11 and multiple second air inlets 12 are connected to an air pump 200 (e.g., ...). Figure 16 As shown, when the air pump 200 is started, it can deliver air to multiple first air inlets 11 and multiple second air inlets 12, thereby controlling the air pressure adjustment and control device to perform air intake operation. Since the air pump 200 is existing technology, and this utility model does not limit the structure of the air pump 200, it will not be described in detail.

[0035] The turntable 3 may be a circular shell, and the turntable 3 is disposed on the lower cover 1. A central shaft 31 of the turntable 3 can be connected to a driving device 5 (such as...). Figure 3 As shown, the drive device 5 can be a motor or a solenoid valve, or other mechanical or electronic devices. The drive device 5 can drive the turntable 3 to rotate on the lower cover 1. Alternatively, the air pressure adjustment control device can be replaced by a device built into the main unit of the air pump 200. Furthermore, the drive device 5 can be replaced by an external mechanical manual valve. The drive device 5 can be any electric, pneumatic, or manual device.

[0036] One side of the turntable 3 has three first flow channels 32, located on the outer side of the center of the turntable 3, and the first flow channels 32 are curved. Another side of the turntable 3 also has a second flow channel 33, located outside the plurality of first flow channels 32. The second flow channel 33 may be arc-shaped and located near the edge of the turntable 3. The second flow channel 33 is connected to at least two of the plurality of first air inlets 11, allowing air input from the plurality of first air inlets 11 to be delivered to the second flow channel 33, enabling the second flow channel 33 to connect a portion of the air inlets and outlets. Another side of the turntable 3 also has a vent hole 34, which communicates with the outside of the turntable 3, allowing for venting operations.

[0037] In addition, an airtight gasket 6 can also be provided between the lower cover 1 and the turntable 3. The airtight gasket 6 has multiple perforations 61, which correspond to the first air inlet 11, the second air inlet 12, the first air outlet 13, the second air outlet 14, the third air outlet 15, the fourth air outlet 16 and the fifth air outlet 17 respectively. The airtight gasket 6 can increase the airtightness between the lower cover 1 and the turntable 3.

[0038] Please see Figure 4 This drives the turntable 3 to rotate, connecting the second air outlet 14, the third air outlet 15, the fourth air outlet 16, and the fifth air outlet 17 to the second flow channel 33. Air is then transported through the second flow channel 33 to the second air outlet 14, the third air outlet 15, the fourth air outlet 16, and the fifth air outlet 17, and subsequently to the second tubular airbag 102, the third tubular airbag 103, the fourth tubular airbag 104, and the fifth tubular airbag 105, maintaining a uniform pressure. At this time, the first air outlet 13 is opposite the vent hole 34, causing the first tubular airbag 101 to vent (e.g., Figure 5 (As shown).

[0039] Please see Figure 6This drives the turntable 3 to rotate, connecting the first air outlet 13, the third air outlet 15, the fourth air outlet 16, and the fifth air outlet 17 to the second flow channel 33. Air is then transported through the second flow channel 33 to the first air outlet 13, the third air outlet 15, the fourth air outlet 16, and the fifth air outlet 17, and subsequently to the first tubular airbag 101, the third tubular airbag 103, the fourth tubular airbag 104, and the fifth tubular airbag 105, maintaining a uniform pressure among them. At this time, the second air outlet 14 is opposite the vent hole 34, allowing the second tubular airbag 102 to vent (e.g., Figure 7 (As shown).

[0040] Please see Figure 8 This drives the turntable 3 to rotate, connecting the first air outlet 13, the second air outlet 14, the fourth air outlet 16, and the fifth air outlet 17 to the second flow channel 33. Air is then transported through the second flow channel 33 to the first air outlet 13, the second air outlet 14, the fourth air outlet 16, and the fifth air outlet 17, and subsequently to the first tubular airbag 101, the second tubular airbag 102, the fourth tubular airbag 104, and the fifth tubular airbag 105, maintaining a uniform pressure among them. At this time, the third air outlet 15 is opposite the vent hole 34, allowing the third tubular airbag 103 to vent (e.g., Figure 9 (As shown).

[0041] Please see Figure 10 This drives the turntable 3 to rotate, connecting the first air outlet 13, the second air outlet 14, the third air outlet 15, and the fifth air outlet 17 to the second flow channel 33. Air is then transported through the second flow channel 33 to the first air outlet 13, the second air outlet 14, the third air outlet 15, and the fifth air outlet 17, and subsequently to the first tubular airbag 101, the second tubular airbag 102, the third tubular airbag 103, and the fifth tubular airbag 105, maintaining a uniform pressure among them. At this time, the fourth air outlet 16 is opposite the vent hole 34, allowing the fourth tubular airbag 104 to vent (e.g., Figure 11 (As shown).

[0042] Please see Figure 12This drives the turntable 3 to rotate, connecting the first air outlet 13, the second air outlet 14, the third air outlet 15, and the fourth air outlet 16 to the second flow channel 33. Air is then transported through the second flow channel 33 to the first air outlet 13, the second air outlet 14, the third air outlet 15, and the fourth air outlet 16, and subsequently to the first tubular airbag 101, the second tubular airbag 102, the third tubular airbag 103, and the fourth tubular airbag 104, maintaining a uniform pressure among them. At this time, the fifth air outlet 17 is opposite the vent hole 34, allowing the fifth tubular airbag 105 to vent (e.g., Figure 13 (As shown).

[0043] Please see Figure 14 This mechanism drives the turntable 3 to rotate, causing multiple second air inlets 12 to connect to multiple first flow channels 32, and connecting the first air outlet 13 and the fourth air outlet 16 to the first flow channel 32, the second air outlet 14 and the fifth air outlet 17 to another first flow channel 32, and the third air outlet 15 to yet another first flow channel 32. This allows air input from the multiple second air inlets 12 to be transported through the multiple first flow channels 32 to the first air outlet 13, the second air outlet 14, the third air outlet 15, the fourth air outlet 16, and the fifth air outlet 17, and then to the first tubular airbag 101, the second tubular airbag 102, the third tubular airbag 103, the fourth tubular airbag 104, and the fifth tubular airbag 105, respectively. It also allows for alternating operations of the first tubular airbag 101, the fourth tubular airbag 104, the second tubular airbag 102, and the fifth tubular airbag 105 (e.g.,...). Figure 15 (As shown).

[0044] [Beneficial Effects of the Examples]

[0045] The beneficial effect of this utility model is that the air pressure adjustment and control device for the air mattress provided by this utility model includes a lower cover and a turntable. The lower cover has multiple first air inlets, multiple second air inlets, a first air outlet, a second air outlet, a third air outlet, a fourth air outlet, and a fifth air outlet. The first air outlet, second air outlet, third air outlet, fourth air outlet, and fifth air outlet are respectively connected to a first tubular air bladder, a second tubular air bladder, a third tubular air bladder, a fourth tubular air bladder, and a fifth tubular air bladder. The multiple first air inlets and multiple second air inlets are connected to an air pump. The turntable is disposed on the lower cover and can rotate on the lower cover. One side of the turntable has three first flow channels, a second flow channel, and a vent hole. The second flow channel is connected to the first air inlet, so that the air input from the first air inlet can be delivered to the second flow channel. This invention drives a turntable to rotate, allowing the three flow channels (first, second, third, fourth, and fifth) and vent holes of the turntable to selectively correspond to the first, second, third, fourth, and fifth vents for alternating inflation, deflation, and pressure equalization. This invention uses a single valve to adjust and control the air pressure of five tubular airbags (foot tubes), enabling one deflation and multiple pressure equalization operations. It provides alternating inflation and deflation for selective pressure relief, preventing continuous pressure on localized skin and effectively preventing bedsores. Furthermore, this invention can simultaneously control the air pressure of multiple tubular airbags, simplifying the overall structure, reducing costs, and facilitating operation. When any single tubular airbag deflates, the other tubes remain inflated (static), unaffected by the alternating air pump operation. Moreover, this invention allows the air pressure adjustment control device to be integrated into the air pump's main unit, making installation and operation simpler and more convenient.

[0046] However, the above description is only a preferred embodiment of the present utility model and is not intended to limit the scope of patent protection of the present utility model. Therefore, all equivalent changes made based on the content of the present utility model specification and drawings are similarly included within the scope of protection of the present utility model and are hereby stated.

Claims

1. An air pressure adjustment and control device for an air mattress, characterized in that, For controlling the tubular airbag assembly at the end of the air mattress, the tubular airbag assembly includes a first tubular airbag, a second tubular airbag, a third tubular airbag, a fourth tubular airbag, and a fifth tubular airbag, and the air mattress air pressure adjustment control device includes: A lower cover has multiple first air inlets, multiple second air inlets, a first air outlet, a second air outlet, a third air outlet, a fourth air outlet, and a fifth air outlet. The first air outlet, second air outlet, third air outlet, fourth air outlet, and fifth air outlet are respectively connected to the first tubular airbag, the second tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag. The multiple first air inlets and the multiple second air inlets are connected to an air pump. A turntable is disposed on the lower cover and is rotatable on the lower cover. One side of the turntable has three first flow channels, one second flow channel, and one vent hole. The three first flow channels are located outside the center of the turntable. The second flow channel is close to the edge of the turntable and is connected to at least two of the plurality of first air inlets, so that air input from the first air inlets can be delivered to the second flow channel. The vent hole is connected to the outside of the turntable. The turntable can be driven to rotate, so that the three first flow channels, the second flow channels and the vent holes of the turntable can selectively correspond to the first vent, the second vent, the third vent, the fourth vent and the fifth vent, for alternating inflation, deflation and pressure equalization operations.

2. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The plurality of first air inlets are three in number and are spaced apart. The plurality of second air inlets are three in number and are spaced apart.

3. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The turntable is connected to a driving device, which can be a mechanical device, an electronic device, a pneumatic device, or a manual device.

4. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The second, third, fourth, and fifth air outlets are connected to the second flow channel, allowing air to be transported through the second flow channel to the second, third, fourth, and fifth air outlets, and then to the second, third, fourth, and fifth tubular airbags respectively to maintain pressure equalization. The first air outlet is opposite to the vent hole, allowing the first tubular airbag to vent.

5. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The first air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, and then respectively to the first tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag to maintain pressure equalization. The second air outlet is opposite to the vent hole, so that the second tubular airbag can be deflated.

6. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The first air outlet, the second air outlet, the fourth air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the fourth air outlet, and the fifth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the fourth tubular airbag, and the fifth tubular airbag to maintain pressure equalization. The third air outlet is opposite to the vent hole, so that the third tubular airbag can be deflated.

7. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The first air outlet, the second air outlet, the third air outlet, and the fifth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the third air outlet, and the fifth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the third tubular airbag, and the fifth tubular airbag to maintain pressure equalization. The fourth air outlet is opposite to the vent hole, so that the fourth tubular airbag can be deflated.

8. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The first air outlet, the second air outlet, the third air outlet, and the fourth air outlet are connected to the second flow channel, so that air can be transported through the second flow channel to the first air outlet, the second air outlet, the third air outlet, and the fourth air outlet, and then respectively transported to the first tubular airbag, the second tubular airbag, the third tubular airbag, and the fourth tubular airbag to maintain pressure equalization. The fifth air outlet is opposite to the vent hole, so that the fifth tubular airbag can be deflated.

9. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, The plurality of second air inlets are respectively connected to the plurality of first flow channels, and the first air outlet and the fourth air outlet are connected to the first flow channels. The second air outlet and the fifth air outlet are connected to another first flow channel, and the third air outlet is connected to yet another first flow channel. This allows the air input from the plurality of second air inlets to be transported through the plurality of first flow channels to the first air outlet, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, and then to the first tubular airbag, the second tubular airbag, the third tubular airbag, the fourth tubular airbag, and the fifth tubular airbag, respectively. The first tubular airbag, the fourth tubular airbag, the second tubular airbag, and the fifth tubular airbag can be operated alternately.

10. The air pressure adjustment and control device for an air mattress as described in claim 1, characterized in that, An airtight gasket is provided between the lower cover and the turntable. The airtight gasket has multiple perforations, which correspond to the multiple first air inlets, the multiple second air inlets, the first air outlet, the second air outlet, the third air outlet, the fourth air outlet, and the fifth air outlet, respectively.

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