Head air seal and hovercraft

Abstract

The head air seal comprises a head air seal body, the lower area of the head air seal body is of a double-layer structure, a plurality of air outlet hole sets are formed in the lower area of the head air seal body at intervals in the height direction, and a plurality of air outlet holes are formed in the air outlet hole sets at intervals in the transverse direction. According to the head air seal, the plurality of air outlet holes are formed in the lower area of the head air seal body, so that air in a pressurizing chamber of the hovercraft can escape from the air outlet holes, the escaping air is attached to the surface of the arc-shaped head air seal due to the coanda effect, an air film is formed, direct contact between water and the head air seal can be isolated, and the safety of the head air seal is improved. Meanwhile, the lower area of the head air seal body is of a double-layer structure, the abrasion resistance of the head air seal can be improved, the service life of the head air seal can be prolonged, the air outlet holes are formed in the area of the double-layer structure, and the area is high in tear resistance, so that the head air seal is more durable. And tearing caused by the arrangement of the air outlet hole is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air cushion vehicles, in particular to a head air seal and an air cushion vehicle. Background Art

[0002] The bow air seal of a hovercraft is also called the front skirt. It is a device used to seal the air cushion at the bow of a full-lift airbag float hovercraft. It is usually a three-dimensional structure with a hyperbolic arc shape. For a full-lift hovercraft, the apron resistance is a considerable component, which is mainly composed of friction resistance, pressure resistance, wet water resistance and wave-making resistance. Among them, friction resistance and wet water resistance are greatly affected by the bow air seal. When the bow air seal is flooded, pushing water will cause a sharp increase in resistance, and in severe cases, it will cause a large head-down moment. Utility Model Content

[0003] The primary purpose of the utility model is to provide a first gas seal to reduce the resistance encountered by the first gas seal.

[0004] Another object of the utility model is to provide an air cushion craft adopting the first air seal.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0006] A first gas seal comprises a first gas seal body, wherein the lower region of the first gas seal body is a double-layer structure, wherein the lower region of the first gas seal body is provided with a plurality of groups of air outlet holes spaced apart along the height direction, and wherein the air outlet holes are spaced apart along the lateral direction.

[0007] Preferably, the distance between two adjacent air outlet groups is 50 mm.

[0008] Preferably, the distance between two adjacent air outlet holes on the left and right is 50 mm.

[0009] Preferably, the diameter of the air outlet hole is 1 mm.

[0010] Preferably, the distance between the uppermost group of air outlet holes and the lowermost group of air outlet holes is 450 mm.

[0011] Preferably, a wear-resistant layer is provided on the outer side of the lower area of ​​the first gas seal body to form a double-layer structure in the lower area of ​​the first gas seal body, and the air outlet is located in the area of ​​the first gas seal body where the wear-resistant layer is provided.

[0012] Preferably, the wear-resistant layer is made of fluororubber.

[0013] Preferably, the first gas seal body is made of Haipailong or PVC material.

[0014] The utility model also relates to an air cushion craft, comprising the first air seal.

[0015] Compared with the prior art, the first gas seal of the utility model has the following beneficial effects:

[0016] In the utility model, a plurality of air outlet holes are provided in the lower area of ​​the first air seal body so that the gas in the boost chamber of the hovercraft can escape from the air outlet holes. The escaped gas adheres to the curved surface of the first air seal due to the Coanda effect to form an air film, which can isolate the direct contact between water and the first air seal. Since the density of water is 800 times the density of air, the friction resistance and wet water resistance of the apron can be effectively reduced, thereby improving the performance of the hovercraft. At the same time, since the lower area of ​​the first air seal body is a double-layer structure, the wear resistance of the first air seal can be improved to increase the service life. Moreover, since the air outlet holes are located in the area of ​​the double-layer structure, the area has strong tear resistance and will not be easily torn due to the setting of the air outlet holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the first gas seal of an embodiment of the utility model.

[0018] In the figure, 1. the main body of the first air seal; 2. the air outlet; 3. the wear-resistant layer. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] In the description of the present utility model, it should be understood that the wording "comprising" used in the present utility model specification refers to the presence of the features, integers, steps, operations, parts / components and / or assemblies, but does not exclude the presence or addition of one or more other features, integers, steps, operations, parts / components, assemblies and / or their groups. It should be understood that when we say that a part / component is "connected" to another part / component, it can be directly connected to the other part / component, or there can be intermediate parts / components. The wording "and / or" used here includes all or any unit and all combinations of one or more associated listed items.

[0021] like Figure 1 As shown, the utility model relates to a first air seal, comprising a first air seal body 1, the lower area of ​​the first air seal body 1 is a double-layer structure, the lower area of ​​the first air seal body 1 is provided with a plurality of groups of air outlet holes spaced apart along the height direction, and the air outlet hole group is provided with a plurality of air outlet holes 2 spaced apart along the lateral direction.

[0022] In the utility model, a plurality of air outlet holes 2 are provided in the lower area of ​​the first air seal body 1 so that the gas in the pressurization chamber of the hovercraft can escape from the air outlet holes 2. The escaped gas adheres to the curved surface of the first air seal due to the Coanda effect to form an air film, which can isolate the direct contact between water and the first air seal. Since the density of water is 800 times the density of air, the friction resistance and wet water resistance of the apron can be effectively reduced, thereby improving the performance of the hovercraft. At the same time, since the lower area of ​​the first air seal body 1 is a double-layer structure, the wear resistance of the first air seal can be improved to increase the service life. Moreover, since the air outlet holes 2 are located in the area of ​​the double-layer structure, the area has strong tear resistance and will not be easily torn due to the setting of the air outlet holes 2.

[0023] In this embodiment, the distance between two adjacent air outlet groups is 50 mm, and the distance between two adjacent air outlet groups is 50 mm.

[0024] That is, the multiple air outlet holes 2 in the lower area of ​​the first air seal body 1 are evenly arranged to form a good air film to wrap the surface of the first air seal body 1 and reduce resistance.

[0025] Preferably, the diameter of the air outlet hole 2 is 1 mm, so that high-pressure gas can escape through the air outlet hole 2, thereby forming a stable air film.

[0026] In this embodiment, the distance between the uppermost air outlet group and the lowermost air outlet group is 450 mm, so as to form an air film of sufficient area on the surface of the first air seal to ensure the reduction of resistance.

[0027] In this embodiment, a wear-resistant layer 3 is provided on the outer side of the lower area of ​​the first gas seal body 1 to form a double-layer structure in the lower area of ​​the first gas seal body 1, and the air outlet 2 is located in the area of ​​the first gas seal body 1 where the wear-resistant layer 3 is provided, thereby improving the wear resistance of the first gas seal to increase the service life. Moreover, this area has strong tear resistance and will not be easily torn due to the setting of the air outlet 2 and the passage of high-pressure gas.

[0028] Preferably, the wear-resistant layer 3 is made of fluororubber, so that the first gas seal can be more wear-resistant, thereby increasing the service life of the first gas seal.

[0029] In this embodiment, the first gas seal body 1 is made of Haipailong material or PVC to increase its service life.

[0030] The utility model also relates to an air cushion craft, comprising the first air seal.

[0031] The hovercraft adopts the first air seal, thereby reducing the resistance of the first air seal, which is beneficial to improving the performance of the hovercraft.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A first gas seal, characterized in that: It comprises a first gas seal body, the lower area of ​​which is a double-layer structure, a plurality of groups of air outlet holes are arranged in the lower area of ​​the first gas seal body at intervals along the height direction, and a plurality of air outlet holes are arranged in the air outlet hole group at intervals along the lateral direction.

2. The first gas seal according to claim 1, characterized in that: The distance between two adjacent air outlet groups is 50 mm.

3. The first gas seal according to claim 1, characterized in that: The distance between two adjacent air outlet holes on the left and right is 50 mm.

4. The first gas seal according to claim 1, characterized in that: The diameter of the air outlet is 1 mm.

5. The first gas seal according to claim 1, characterized in that: The distance between the uppermost group of air outlet holes and the lowermost group of air outlet holes is 450 mm.

6. The first gas seal according to claim 1, characterized in that: A wear-resistant layer is provided on the outer side of the lower area of ​​the first gas seal body to form a double-layer structure in the lower area of ​​the first gas seal body, and the air outlet is located in the area of ​​the first gas seal body where the wear-resistant layer is provided.

7. The first gas seal according to claim 6, characterized in that: The wear-resistant layer is made of fluororubber.

8. The first gas seal according to claim 1, characterized in that: The first gas seal body is made of Haipailong or PVC material.

9. A hovercraft, characterized in that: Comprising the first gas seal as described in any one of claims 1-8.

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