CN217826935U - Piston type ventilated shoe pad and shoe - Google Patents

Abstract

Piston interchangeable air shoe-pad and shoes relate to shoes technical field. The insole comprises an insole body, wherein a piston type air exchange mechanism is arranged at the bottom of the insole body, the piston type air exchange mechanism comprises a hollow shell, a connecting rod is arranged on the bottom wall of the hollow shell, a piston plate and a supporting bottom plate are respectively arranged at the upper end and the lower end of the connecting rod, a mounting groove is formed in the side part of the piston plate, an opening penetrating through the upper wall of the mounting groove is formed in the upper end face of the piston plate, an elastic sealing ring is installed in a gap in the mounting groove, the outer side wall of the elastic sealing ring is close to the inner side wall of the hollow shell, a gap is reserved between the inner side wall of the elastic sealing ring and the side wall of the mounting groove opposite to the inner side wall of the elastic sealing ring, the outer side wall of the elastic sealing ring can be tightly attached to or far away from the inner side wall of the hollow shell under the extrusion action of compressed gas, an elastic reset component is arranged between the hollow shell and the piston plate or the supporting bottom plate, and the top and the bottom of the side wall of the hollow shell are respectively provided with an upper channel and a lower channel communicated with the outside of the insole body. The insole can realize ventilation in the shoe body and keep the inside of the shoe dry.

Description

Piston type ventilated shoe pad and shoe

Technical Field

The utility model relates to a shoes technical field especially indicates a piston interchangeable air shoe-pad and shoes.

Background

As a tool for protecting feet from being injured, shoes have long become essential daily necessities for people. In real life, people often cause dampness in shoes due to the fact that the inside of the shoes is not breathable after walking for a period of time by wearing the shoes, and therefore bacteria are bred to infect feet. Although insoles which are used for improving the environment in shoes and increasing the comfort, such as antibacterial deodorant medicinal insoles, silica gel insoles and the like, appear in the market at present, the insoles can improve the environment in shoes and increase the comfort, but the problem of ventilation in the shoes is not solved well.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a piston ventilation shoe-pad can realize the inside taking a breath of shoes, lets keep dry in the shoes.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the piston type air-exchangeable insole comprises an insole body, wherein a piston type air exchange mechanism is arranged at the bottom of the insole body and comprises a hollow shell, a through hole is formed in the bottom wall of the hollow shell, a connecting rod is arranged in the through hole in a clearance manner, a piston plate capable of sliding up and down in the hollow shell along the inner side wall of the connecting rod is arranged at the upper end of the connecting rod, an inwards concave mounting groove is formed in the piston plate around the side part of the piston plate in a surrounding manner, an opening penetrating through the upper wall of the mounting groove is formed in the upper end face of the piston plate, an elastic sealing ring is arranged in the mounting groove in a clearance manner, the outer side wall of the elastic sealing ring is close to the inner side wall of the hollow shell, a gap is reserved between the inner side wall of the elastic sealing ring and the side wall of the mounting groove opposite to the inner side wall of the elastic sealing ring, the outer side wall of the elastic sealing ring can be close to or far away from the inner side wall of the hollow shell under the extrusion action of compressed gas, a supporting bottom plate is arranged at the lower end of the connecting rod, an elastic reset part is arranged between the hollow shell and the supporting bottom plate or the piston plate, and an upper channel and a lower channel communicated with the outer part are arranged at the top and the bottom of the side wall of the hollow shell.

Furthermore, the elastic reset component is a reset spring, the reset spring is a compression spring, and two ends of the reset spring are respectively connected with the upper surface of the supporting base plate and the outer bottom wall of the hollow shell.

Furthermore, the elastic reset component is a reset spring which is a compression spring, and two ends of the reset spring are respectively connected with the upper surface of the piston plate and the inner top wall of the hollow shell.

Furthermore, the elastic reset component is a reset spring, the reset spring is an extension spring, and two ends of the reset spring are respectively connected with the lower surface of the piston plate and the inner bottom wall of the hollow shell.

Furthermore, the inside end and the outside end of the upper channel are respectively provided with an inner baffle and an outer baffle, a floating ball is arranged between the inner baffle and the outer baffle, the inner baffle is provided with an air hole with the inner diameter smaller than the diameter of the floating ball, the floating ball can move towards the inner baffle and block the air hole or move towards the outer baffle and abut against the outer baffle under the action of air flow, and the outer baffle is provided with hollow parts communicated with the inside and the outside of the upper channel at other positions abutted by the floating ball.

Furthermore, the hollowed-out parts on the outer baffle are through holes, and the number of the through holes is multiple and the through holes are distributed on the outer baffle in an annular manner.

Furthermore, the upper surface of the insole body is provided with an air outlet slot hole at a position far away from the hollow shell, and the air outlet slot hole is communicated with the upper channel through an air transmission channel arranged in the insole body.

Furthermore, the air outlet slotted holes are strip-shaped grooves, the number of the air outlet slotted holes is multiple, the air outlet slotted holes are distributed on the upper surface of the insole body at intervals, and the air outlet slotted holes are communicated with one another.

Furthermore, the insole body comprises a forefoot part and a heel part, and the piston type ventilation mechanism is arranged at the bottom of the forefoot part or the bottom of the heel part.

Furthermore, a bottom pad is arranged below the insole body, and the supporting bottom plate is clamped by the bottom pad and the insole body.

Another object of the present invention is to provide a shoe, which comprises an upper, a sole, and the above piston-type ventilating insole.

Furthermore, the vamp is provided with a vent hole, and the lower channel is connected with the vent hole.

Above-mentioned piston shoe-pad of can taking a breath can realize the inside taking a breath of the shoes body at people's walking in-process through setting up piston mechanism of taking a breath, lets keep dry in the shoes, reduces humidity and peculiar smell in the shoes, eliminates bacterial growing and reproduction condition, makes the wearer feel ventilated and breathable, and the comfort is strong, and makes the foot be difficult for receiving the bacterial infection.

Drawings

FIG. 1 is a perspective view of a piston type breathable insole in an embodiment;

FIG. 2 is a front view of the piston type ventilated shoe pad in the embodiment;

FIG. 3 is a first sectional view of the piston type breathable insole in the embodiment in which a return spring is provided between an upper surface of a piston plate and an inner top wall of a hollow shell;

fig. 4 is a first cross-sectional view of the piston ventilation mechanism in the embodiment in which a return spring is provided between an upper surface of a piston plate and an inner top wall of a hollow housing;

FIG. 5 is a perspective view of the piston ventilation mechanism of the embodiment;

FIG. 6 is a side view of an outer barrier in an embodiment;

FIG. 7 is a perspective view of the piston plate of the embodiment;

FIG. 8 is a perspective view of a piston plate with an elastomeric seal installed in an embodiment;

FIG. 9 is a second sectional view of the piston type breathable insole in the embodiment in which a return spring is provided between the lower surface of the piston plate and the inner bottom wall of the hollow shell;

fig. 10 is a second cross-sectional view of the piston ventilation mechanism in the embodiment in which the return spring is provided between the lower surface of the piston plate and the inner bottom wall of the hollow housing;

FIG. 11 is a third sectional view of the piston type breathable insole in the embodiment in which a return spring is provided between a support base and a hollow case;

fig. 12 is a third sectional view of the piston ventilation mechanism in the embodiment in which the return spring is provided between the support base and the hollow housing.

In the figure:

1-insole body 1 a-front sole part 1a 1-air outlet slotted hole

1 b-heel 1 c-gas transmission channel 2-hollow shell

2 a-upper shell 2 b-lower shell 3-connecting rod

3 a-upper rod body 3 b-lower rod body 4-piston plate

4 a-mounting groove 4 b-opening 5-elastic sealing ring

6-support bottom plate 7-upper channel 8-lower channel

9-return spring 10-inner baffle 10 a-air hole

11-outer baffle plate 11 a-hollow part 12-floating ball

13-bottom mat 14-casing.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

A shoe comprises a vamp, an insole and a sole, wherein the insole adopts a piston type ventilated insole. Specifically, as shown in fig. 1 to 10, the piston type breathable insole includes an insole body 1, a piston type ventilation mechanism is disposed at the bottom of the insole body 1, the piston type ventilation mechanism includes a hollow casing 2, a through hole is disposed on the bottom wall of the hollow casing 2, and a connecting rod 3 is mounted in the through hole with a gap, an upper end of the connecting rod 3 is provided with a piston plate 4 capable of sliding up and down along the inner side wall of the hollow casing 2, the piston plate 4 is provided with a recessed mounting groove 4a around a periphery of a side portion thereof, the mounting groove 4a may be a U-shaped groove, an upper end surface of the piston plate 4 is provided with an opening 4b penetrating through the upper wall of the mounting groove 4a, the opening 4b may be U-shaped, the number of the opening 4b may be plural and is annularly and spaced at an edge of the upper end surface of the piston plate 4, an elastic sealing ring 5 is mounted in the middle of the mounting groove 4a, the cross-sectional diameter of the elastic sealing ring 5 is smaller than the depth of the elastic sealing ring 4a, the elastic sealing ring 5 may be made of an elastic rubber material, an outer side wall of the elastic sealing ring 5 may be tightly attached to or separated from the inner side wall of the hollow casing 2 under the effect of being compressed air, and the inner side wall of the hollow casing 2, the air is easily pressed by the air, and the air in the air supply is easily generated by the air in the hollow casing 2, and the air supply device when the air gap. The lower end of the connecting rod 3 is provided with a supporting base plate 6, an elastic resetting component is arranged between the hollow shell 2 and the supporting base plate 6 or the piston plate 4, and the top and the bottom of the side wall of the hollow shell 2 are provided with an upper channel 7 and a lower channel 8 which are communicated with the outside of the insole body 1. The insole body 1 comprises a half sole part 1a positioned at the front end of the insole body 1 and a heel part 1b positioned at the rear end of the insole body 1, and the piston type ventilation mechanism can be arranged at the bottom of the half sole part 1a or the bottom of the heel part 1b, so that the hollow shell 2 can be downwards pressed by the half sole when the half sole of the foot is grounded or downwards pressed by the heel when the heel of the foot is grounded.

Wherein, elasticity reset unit can adopt reset spring 9, as a first kind of setting mode, reset spring 9 can establish between the upper surface of piston plate 4 and the interior roof of hollow shell 2 and support them respectively, can refer to fig. 3, 4, when hollow shell 2 is stepped on and is pressed, piston plate 4 draws close hollow shell 2 interior roof, reset spring 9 is compressed thereupon, when the foot lifts up, reset spring 9 alright promote hollow shell 2 through its resilience force and shift up reset or piston plate 4 moves down and resets, reset spring 9 wherein is compression spring, can adopt tower spring, occupied space after can saving the spring compression, thereby be convenient for hollow shell 2 carries out more abundant exhaust. As a second arrangement, the return spring 9 may also be disposed between the lower surface of the piston plate 4 and the inner bottom wall of the hollow housing 2 and sleeved on the connecting rod 3, and two ends of the return spring 9 are respectively connected to the lower surface of the piston plate 4 and the inner bottom wall of the hollow housing 2, as shown in fig. 9 and 10, when the hollow housing 2 is stepped on, the piston plate 4 is far away from the inner bottom wall of the hollow housing 2, the return spring 9 is extended therewith, and when the foot is lifted, the return spring 9 can pull the piston plate 4 to move down for return or the hollow housing 2 to move up for return through its resilience, wherein the return spring 9 is an extension spring (referred to as "extension spring"). As a third arrangement, the return spring 9 may also be disposed between the upper surface of the supporting base plate 6 and the outer bottom wall of the hollow shell 2 and respectively abut against them, the return spring 9 is sleeved on the connecting rod 3, see fig. 11 and 12, when the hollow shell 2 is stepped on, the hollow shell 2 moves down, the piston plate 4 moves up relatively, the return spring 9 is compressed therewith, when the foot is lifted up, the return spring 9 can push the hollow shell 2 to move up through its resilience force, so that the piston plate 4 moves down relatively to reset, wherein the return spring 9 is a compression spring, a tower-shaped spring can be adopted, the space occupied by the compressed spring can be saved, and thus the hollow shell 2 can exhaust more fully.

It should be noted that, in the three setting modes of the return spring 9, the third and second modes are better than the first mode, because the upper end of the spring is not pressed against the inner top wall of the hollow shell 2 close to the upper surface of the insole, the discomfort caused by the deformation of the spring during the pressing process of the user can be reduced, wherein the effect of the third mode is better. The present embodiment will be described in detail with reference to the return spring 9 in a first arrangement, in which the return spring 9 is a compression spring disposed between the upper surface of the piston plate 4 and the inner top wall of the hollow housing 2.

When the piston type air-exchangeable shoe pad is stepped by feet, the hollow shell 2 moves downwards along with the shoe pad, the piston plate 4 can keep unchanged in position under the action of the supporting base plate 6, so that air between the piston plate 4 and the inner top wall of the hollow shell 2 is compressed, the compressed air enters the mounting groove 4a through the opening 4b in the piston plate 4 and rushes into the space between the inner side wall of the elastic sealing ring 5 and the side wall of the mounting groove 4a opposite to the inner side wall of the elastic sealing ring 5 to extrude the elastic sealing ring 5 to enable the outer side wall to cling to the inner side wall of the hollow shell 2 to play a sealing role, the upper channel 7 is communicated with the outside of the shoe pad body 1, the compressed air can be blown to the outside of the shoe pad body 1 through the upper channel 7, meanwhile, the pressure between the piston plate 4 and the lower part of the hollow shell 2 is smaller than the external pressure, and the external air can enter the hollow shell 2 through the lower channel 8 to be stored; when the foot is lifted, the hollow shell 2 can move upwards to reset under the action of the elastic resetting component, the piston plate 4 keeps unchanged under the action of the supporting bottom plate 6, so that air between the piston plate 4 and the inner bottom wall of the hollow shell 2 is compressed, the compressed air rushes into the space between the outer side wall of the elastic sealing ring 5 and the inner side wall of the hollow shell 2 to extrude the elastic sealing ring 5, the outer side wall of the elastic sealing ring 5 leaves the inner side wall of the hollow shell 2 to generate a gap between the outer side wall and the inner top wall, one part of the compressed air can enter the space between the piston plate 4 and the inner top wall of the hollow shell 2 from the gap to be stored, and the other part of the compressed air can be blown to the outside of the insole body 1 from the lower channel 8. So circulate, can realize the inside taking a breath of shoes through above-mentioned piston ventilative shoe-pad at people's walking in-process, ventilate and take a breath in to shoes, can let keep dry in the shoes, reduce the humidity and the peculiar smell in the shoes, eliminate bacterial growing and reproduction condition, make the wearer feel ventilate, the comfort is strong, and makes the foot be difficult for receiving the bacterial infection.

Wherein, blow to the inside of shoes to the outside gas of shoe-pad body 1 through upper channel 7, the gas that gets into in the shoes can be followed the foot edge and escaped from the welt, and outside in order to make lower passageway 8 intercommunication shoes, can set up the inside and outside air vent of intercommunication shoes on the vamp, lower passageway 8 is connected with the air vent, thereby let the 8 exhanst gas of lower passageway can directly be arranged outside the shoes, also can inhale the outside fresh air of shoes simultaneously, it is better to the air alternation in the shoes, also can produce the air flow in the shoes from this, keep the interior drying of shoes.

As shown in fig. 4, the upper channel 7 may be provided with a check valve, which specifically includes an inner baffle 10 and an outer baffle 11 respectively disposed at the inner side end and the outer side end of the upper channel 7, a floating ball 12 is disposed between the inner baffle 10 and the outer baffle 11, the inner baffle 10 is provided with an air hole 10a having an inner diameter smaller than the diameter of the floating ball 12, the floating ball 12 can move toward the inner baffle 10 and block the air hole 10a under the action of air flow or move toward the outer baffle 11 and abut against the middle of the outer baffle 11, and the outer baffle 11 is provided with a hollow portion 11a communicating the inside and the outside of the upper channel 7 at another position where the outer baffle 11 is abutted by the floating ball 12. The working principle of the one-way valve structure is that when the distance between the piston plate 4 and the inner top wall of the hollow shell 2 is reduced, the pressure is increased, air in the one-way valve is compressed and rushes into the upper channel 7 to push the floating ball 12 to move towards the outer baffle 11 and abut against the outer baffle 11, and then enters the shoe through the hollow part 11a on the outer baffle 11. When the distance between the piston plate 4 and the inner top wall of the hollow housing 2 is enlarged, the pressure is reduced to be lower than the external pressure, so that the external air can enter the upper passage 7 and push the floating ball 12 to move toward the inner baffle 10 and block the air hole 10a. As shown in fig. 5 and 6, a sleeve 14 may be sleeved on an outer end of the upper channel 7, an outer baffle 11 may be disposed in the sleeve 14 and abutted on an outer end face of the upper channel 7, and the sleeve 14 and the outer baffle 11 are integrally formed. The hollow parts 11a on the outer baffle 11 are through holes and the number of the through holes is multiple and are distributed on the outer baffle 11 in an annular mode, the hollow parts 11a can be four fan-shaped through holes distributed outside the middle part of the outer baffle 11 in an annular mode, and when the floating ball 12 abuts against the middle part of the outer baffle 11, the inner part of the upper channel 7 can be communicated with the outside through the fan-shaped through holes. The check valve is simple in structure and few in used parts, the floating ball 12 is driven by airflow to move in the upper channel 7 to block the air hole 10a or abut against the outer baffle plate 11 to achieve one-way air outlet, compared with the existing check valve with a valve core, a spring and other complex structures, the check valve is simpler in structure, the risk of damage caused by more parts can be reduced, and the service life is prolonged.

It should be noted that the hollow shell 2 only needs to be arranged at the foot force application point position on the insole body 1, and when the foot is pressed down, pressure can be applied to the hollow shell 2 to enable the hollow shell 2 to move down, and when the foot is lifted up, the hollow shell 2 can be far away from the hollow shell 2 to enable the hollow shell 2 to reset upwards. In general, when people walk, the heel touches the ground first, in order to be more practical, the hollow shell 2 is arranged at the bottom of the heel part 1b, when the heel is pressed on the heel part 1b of the insole body 1, pressure can be applied to the hollow shell 2 to enable the hollow shell 2 to move downwards, air in the hollow shell 2 is compressed to enable the hollow shell 2 to be exhausted into a shoe, when the heel is lifted, the hollow shell 2 can move upwards to reset under the action of the reset spring 9, and external air can be sucked and stored in the reset process of the hollow shell 2. In order to make the air blown out from the upper channel 7 enter the shoe better, an air outlet slot hole 1a1 is arranged on the upper surface of the half sole part 1a far away from the hollow shell 2, an air transmission channel 1c is arranged between the half sole part 1a and the heel part 1b and is used for communicating the air outlet slot hole 1a1 with the upper channel 7, and the air transmission channel 1c can be arranged inside the insole body 1. Moreover, the air outlet groove holes 1a1 can also allow the blown air to directly blow and dry the half sole area of the foot, thereby reducing the humidity in the shoe caused by the sweating of the foot. The air outlet slots 1a1 can be strip-shaped grooves, the number of the air outlet slots 1a1 is multiple, the air outlet slots are distributed on the upper surface of the insole body 1 at intervals, and the air outlet slots 1a1 are communicated with one another, so that air coming out of the upper channel 7 can enter shoes more dispersedly through the strip-shaped grooves, and all areas in the shoes can be kept dry as far as possible.

In addition, as shown in fig. 2 and 3, a bottom pad 13 can be arranged below the insole body 1, and the supporting bottom plate 6 of the piston type ventilation mechanism is clamped between the bottom pad 13 and the insole body 1, so that direct friction between the supporting bottom plate 6 and the sole can be avoided, and abrasion is reduced. In addition, in order to facilitate the dismouting and change, can adopt detachable connected mode between each part among the piston ventilation mechanism, for example, hollow shell 2 can constitute and the two cup joints together and pass through threaded fixation by last casing 2a and lower casing 2b, connecting rod 3 also can constitute and the two cup joints together and pass through threaded fixation by last body of rod 3a and lower body of rod 3b, goes up body of rod 3a and is connected with piston plate 4, and lower body of rod 3b is connected with supporting baseplate 6, see fig. 4.

The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention has been disclosed for the preferred embodiment, the present invention is not limited to the product form and the pattern, and any person skilled in the art can make some modifications or modifications to the equivalent embodiment of the equivalent variations without departing from the technical scope of the present invention, but all the contents of the technical solution of the present invention do not depart from the scope of the patent of the technical solution of the present invention.

Claims (10)

1. Piston interchangeable air shoe-pad, including shoe-pad body (1), its characterized in that: the bottom of the insole body (1) is provided with a piston type air exchange mechanism which comprises a hollow shell (2), a through hole is arranged on the bottom wall of the hollow shell (2) and a connecting rod (3) is arranged in the through hole with a gap, the upper end of the connecting rod (3) is provided with a piston plate (4) which can slide up and down along the inner side wall of the hollow shell (2), the piston plate (4) is provided with an inwards concave mounting groove (4 a) around the side part of the piston plate, the upper end surface of the piston plate (4) is provided with an opening (4 b) which penetrates through the upper wall of the mounting groove (4 a), an elastic sealing ring (5) is arranged in the mounting groove (4 a) in a clearance manner, the outer side wall of the elastic sealing ring (5) is close to the inner side wall of the hollow shell (2), a gap is reserved between the inner side wall of the elastic sealing ring (5) and the side wall of the mounting groove (4 a) opposite to the inner side wall, the outer side wall of the elastic sealing ring (5) can be tightly attached to or far away from the inner side wall of the hollow shell (2) under the extrusion action of compressed gas, the lower end of the connecting rod (3) is provided with a supporting bottom plate (6), an elastic reset component is arranged between the hollow shell (2) and the piston plate (4) or the supporting bottom plate (6), the top and bottom parts of the side wall of the hollow shell (2) are provided with an upper channel (7) and a lower channel (8) which are communicated with the outside of the insole body (1).

2. The piston-type breathable insole of claim 1, wherein: the elastic reset component is a reset spring (9), the reset spring (9) is a compression spring, and two ends of the reset spring (9) are respectively connected with the upper surface of the supporting bottom plate (6) and the outer bottom wall of the hollow shell (2).

3. The piston-type breathable insole of claim 1, wherein: the elastic reset component is a reset spring (9), the reset spring (9) is a compression spring, and two ends of the reset spring (9) are respectively connected with the upper surface of the piston plate (4) and the inner top wall of the hollow shell (2).

4. The piston-type breathable insole of claim 1, wherein: the elastic reset component is a reset spring (9), the reset spring (9) is an extension spring, and two ends of the reset spring (9) are respectively connected with the lower surface of the piston plate (4) and the inner bottom wall of the hollow shell (2).

5. The piston-type breathable insole of claim 1, wherein: go up the medial extremity and the outside end branch of passageway (7) and be equipped with interior baffle (10) and outer baffle (11), be equipped with floating ball (12) between interior baffle (10) and outer baffle (11), set up on interior baffle (10) that the internal diameter is less than air pocket (10 a) of floating ball (12) diameter, floating ball (12) can be under the air current effect to interior baffle (10) direction removal and plug up air pocket (10 a) or outside baffle (11) direction removal and support outside on baffle (11), outside baffle (11) are equipped with intercommunication upper channel (7) inside and outside fretwork position (11 a) in its other positions that are supported by floating ball (12).

6. The piston-type breathable insole of claim 5, wherein: the hollow parts (11 a) on the outer baffle (11) are through holes, and the number of the through holes is multiple and the through holes are distributed on the outer baffle (11) in an annular manner.

7. The piston-type breathable insole of claim 1, wherein: the insole is characterized in that an air outlet slotted hole (1 a 1) is formed in the position, far away from the hollow shell (2), of the upper surface of the insole body (1), and the air outlet slotted hole (1 a 1) is communicated with the upper channel (7) through an air conveying channel (1 c) formed in the insole body (1).

8. The piston-type ventilated footwear insole of claim 7, wherein: the air outlet slotted holes (1 a 1) are strip-shaped grooves, the number of the air outlet slotted holes is multiple, the air outlet slotted holes are distributed on the upper surface of the insole body (1) at intervals, and the air outlet slotted holes (1 a 1) are communicated with one another.

9. The piston-type breathable insole of claim 1, wherein: a bottom pad (13) is arranged below the insole body (1), and the supporting bottom plate (6) is clamped between the bottom pad (13) and the insole body (1).

10. A shoe, which comprises a vamp and a sole, and is characterized in that: the piston type breathable insole as claimed in any one of claims 1 to 9 is further included, wherein the upper is provided with ventilation holes, and the lower channel (8) is connected with the ventilation holes.

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