Self-adaptive sealing structure of negative pressure cross-medium revolving body experiment model

Abstract

The invention provides a self-adaptive sealing structure of a negative-pressure cross-medium revolving body experimental model, and belongs to the field of cross-medium navigation body water outlet experiments in a negative-pressure environment. The problems that a negative-pressure-environment cross-medium water outlet experiment model is prone to being pulled out, and water outlet kinetic energy of a navigation body is insufficient due to insufficient sealing performance under the dynamic working condition are solved. The device comprises a fixing part used for being detachably connected to a navigation body; the self-adaptive sealing part is connected with the fixing part, the whole self-adaptive sealing part is of a truncated umbrella fabric-shaped flexible structure, and the navigation body is in interference fit with the inner wall of the acceleration cylinder when installed in the acceleration cylinder and used for being attached to the inner wall of the acceleration cylinder all the time when the navigation body moves in the acceleration cylinder; and the connecting part is used for fixing the self-adaptive sealing part on the fixing part. The device is mainly used for dynamic sealing of the revolving body experiment model.

Description

Technical Field

[0001] The present invention belongs to the field of water exit experiments of cross-media navigation bodies in negative pressure environments, and in particular relates to an adaptive sealing structure of a negative pressure cross-media rotating body experimental model. Background Art

[0002] When a vehicle model is tested for exiting water across a medium under negative pressure, an acceleration booster is generally used underwater to ensure the speed of the experimental model when exiting the water. Taking gas booster as an example, the model is pushed vertically out of the acceleration cylinder with a high initial velocity, passing through the medium and flying over the water surface. An effective seal is required between the model and the acceleration cylinder so that the booster gas acts directly and evenly on the tail of the model to ensure the required speed and pressure when the model exits the water.

[0003] During negative pressure cross-medium water discharge experiments, a pressure differential exists. To minimize this pressure differential and prevent the model from being pulled out of the acceleration cylinder, the seal between the experimental model and the cylinder is crucial. Traditional sealing structures often use fixed sealing rings or rigid sealing devices. In negative pressure environments, these sealing structures are susceptible to failure due to changes in the internal and external pressure differential. When the model moves at high speeds, the sealing structure has difficulty adapting to dynamic friction and impact, resulting in a decrease in sealing performance. Traditional sealing structures struggle to balance sealing effectiveness with low resistance requirements, affecting the accuracy of experimental data. To address these technical challenges, an adaptive sealing structure between the vehicle discharge model and the acceleration cylinder is urgently needed, one that can adapt to negative pressure environments, provide dynamic sealing, and offer low resistance. Summary of the Invention

[0004] In view of this, the present invention aims to propose an adaptive sealing structure for a negative pressure cross-media rotating body experimental model to solve the problem that the cross-media water-outlet experimental model in a negative pressure environment is easily pulled out and the insufficient sealing under dynamic conditions leads to insufficient kinetic energy of the navigation body out of the water.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an adaptive sealing structure for a negative pressure cross-medium rotating body experimental model, comprising:

[0006] A fixing portion, used for detachably connecting to the navigation body;

[0007] The adaptive sealing part is connected to the fixed part and is a flexible structure shaped like a truncated umbrella. When the vehicle is installed in the accelerator cylinder, it has an interference fit with the inner wall of the accelerator cylinder, ensuring that the vehicle always adheres to the inner wall of the accelerator cylinder when moving in the accelerator cylinder.

[0008] The connecting portion is used to fix the adaptive sealing portion on the fixing portion.

[0009] Furthermore, the fixing portion, the adaptive sealing portion and the connecting portion are coaxially arranged.

[0010] Furthermore, the fixing portion, the adaptive sealing portion and the connecting portion are connected in sequence.

[0011] Furthermore, the fixing portion, the adaptive sealing portion and the connecting portion are connected by bolts.

[0012] Furthermore, the fixing portion is connected to the navigation body via bolts.

[0013] Furthermore, the thickness of the adaptive sealing portion gradually decreases from the side close to the fixing portion to the side away from the fixing portion.

[0014] Furthermore, the fixing portion and the connecting portion are both made of annular high-strength aluminum alloy.

[0015] Furthermore, a plurality of radial holes are provided on the peripheral side of the fixing portion, and a plurality of first axial holes are provided on the end surface.

[0016] Furthermore, a plurality of second axial holes corresponding to the positions of the first axial holes are provided on the end surfaces of the adaptive sealing portion and the connecting portion.

[0017] Furthermore, the adaptive sealing part is made of polyurethane or fluororubber.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The adaptive sealing part is a flexible structure in the shape of a truncated umbrella. When the vehicle is installed in the acceleration cylinder, it has an interference fit with the inner wall of the acceleration cylinder, so that the vehicle always sticks to the inner wall of the acceleration cylinder when it moves in the acceleration cylinder. This setting can effectively seal the sealing ring when negative pressure is formed in the acceleration cylinder, avoiding failure due to excessive difference, and at the same time preventing the model from being pulled out of the acceleration cylinder; when the model accelerates, the sealing ring maintains close contact with the cylinder wall under the action of clamping of the fixing part and the connecting part. When the model enters the air from underwater, the sealing ring automatically adjusts its deformation to ensure that the sealing performance is not affected by changes in the medium, achieving a dynamic adaptive effect. At the same time, the flexible structure can ensure sealing while reducing friction resistance, providing a prerequisite for the dynamic experimental vehicle to have good kinetic energy characteristics.

[0020] 2. The fixing parts and connecting parts are all made of high-strength aluminum alloy with anodized surface. They are high-strength, high-temperature resistant, low-density, and light-weight, which can meet the needs of experiments under negative pressure environments. The sealing device is assembled with bolts, which is safe and reliable and easy to install and replace.

[0021] 3. The adaptive sealing part is made of polyurethane or fluororubber material, which has high elasticity and wear resistance. The shape adopts a transition form with a thick root and slightly thin leaves, so that an interference fit is formed between the model and the cylinder. It can form a static fixation to prevent the vehicle from being extracted, and a dynamic seal to ensure that the gas will not leak from the acceleration cylinder and the vehicle to ensure the kinetic energy of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A three-dimensional diagram of an adaptive sealing structure of a negative pressure cross-medium rotating body experimental model according to the present invention;

[0024] Figure 2 A side view of an adaptive sealing structure of a negative pressure cross-medium rotating body experimental model according to the present invention;

[0025] Figure 3 This is a state diagram of a negative pressure cross-medium rotating body experimental model adaptive sealing structure according to the present invention being installed on a vehicle model, and the vehicle model being placed in an acceleration cylinder;

[0026] Figure 4 is a three-dimensional schematic diagram of the fixing portion of the present invention;

[0027] Figure 5 is a side view of the fixing portion of the present invention;

[0028] Figure 6 A side view of the adaptive sealing portion of the present invention;

[0029] Figure 7 This is a front view of the adaptive sealing portion of the present invention;

[0030] Figure 8 It is a front view of the connecting portion described in the present invention.

[0031] Fixed part 1; adaptive sealing part 2; connecting part 3. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0033] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", "left side", "right side", "upper", "lower", "top", and "bottom" are all defined based on the relationship between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure described must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. In the description of the present invention, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0034] In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0035] Referring to the accompanying drawings, this embodiment is described, which is an adaptive sealing structure for a negative pressure cross-medium rotating body experimental model, comprising:

[0036] The fixing part 1 is used for detachably connecting to the navigation body;

[0037] The adaptive sealing part 2 is connected to the fixed part 1 and is a flexible structure shaped like a truncated umbrella. When the vehicle is installed in the accelerator cylinder, it has an interference fit with the inner wall of the accelerator cylinder, ensuring that the vehicle always adheres to the inner wall of the accelerator cylinder when moving in the accelerator cylinder.

[0038] The connecting portion 3 is used to fix the adaptive sealing portion 2 on the fixing portion 1 .

[0039] The fixing portion 1 and the connecting portion 3 can form a two-sided sandwich structure in the axial direction, thereby fixing the adaptive sealing portion 2 located in the middle on both sides in the axial direction. This arrangement allows the sealing structure to have a certain strength as a whole, and to form a reliable connection when it is fixed to the navigation body. The adaptive sealing portion 2, through its own flexibility and the interference fit connection with the acceleration cylinder, can ensure a certain degree of fixation in a static state, preventing the navigation body from being pulled out of the acceleration cylinder due to changes in external pressure, and can also ensure good dynamic sealing when the navigation body is moving and accelerating in the acceleration cylinder. In this way, the connection strength is met, and the sealing and anti-extraction properties are guaranteed under various working conditions. It ensures that the acceleration process of the navigation body out of the water in a negative pressure environment is completed smoothly, and the stability of the kinetic energy of the water out is ensured, and the kinetic energy of the water out will not be affected by air leakage due to poor sealing. The setting of the adaptive sealing part 2 improves both the static anti-extraction and dynamic sealing properties. Traditional sealing leather cups are mostly in a static or low-speed state when in use. The overall structure does not have changes in thickness, does not have dynamic performance and static anti-extraction functions, and most of them do not match the operating conditions of the navigation body exiting the barrel and negative pressure. The structure is complex and relies on mechanical deformation. It cannot cope with negative pressure or medium switching and cannot be used under such conditions. This structure can adapt well to the effects under dynamic and static conditions through this structure and installation form, solving the problem that the kinetic energy and static characteristics of the navigation body experiments have always been unable to match well, and is of great significance to actual engineering tests. At the same time, the three-layer structural feature can not only ensure structural strength and prevent tearing, but also achieve a harmonious unity of static anti-extraction and dynamic sealing through flexible characteristics and interference fit installation form, solving the problem of model water discharge under negative pressure conditions in this field.

[0040] In this embodiment, the fixing portion 1, the adaptive sealing portion 2 and the connecting portion 3 are coaxially arranged to form an integrated structure that can be more conveniently mounted on a rotating navigation body.

[0041] In this embodiment, the fixing portion 1, the adaptive sealing portion 2, and the connecting portion 3 are sequentially connected. The smooth connection arrangement forms a sandwich structure with hard sides and a soft center, which can ensure that the entire structure can be installed on the navigation body to a certain extent and ensure a tight fit and stability.

[0042] In this embodiment, the fixed portion 1, adaptive sealing portion 2, and connecting portion 3 are connected by bolts. This bolted connection allows for rapid assembly and disassembly of the fixed portion 1, adaptive sealing portion 2, and connecting portion 3. If the adaptive sealing portion 2 becomes worn and requires replacement, the sealing structure can be quickly disassembled and replaced. Other types of removable and reusable structures may also be used for connection, depending on actual needs. Any structure capable of reassembly and disassembly is within the spirit of this invention.

[0043] In this embodiment, the fixing portion 1 is connected to the navigation body by bolts. Other types of structures can also be used to complete the connection between the fixing portion 1 and the navigation body according to actual needs. Any structure that helps to increase the convenience of repeated assembly and disassembly can be used in this structure.

[0044] In this embodiment, the thickness of the adaptive sealing part 2 gradually decreases from the side close to the fixed part 1 to the side away from it. The thickness is the thickest at the connection between the adaptive sealing part 2, the fixed part 1 and the connecting part 3. This setting method is to ensure the stability of the sandwich structure and prevent the root from being too weak and causing tearing during the acceleration process. Therefore, ensuring a certain thickness at the root helps to improve the structural strength and reliability and prevent air leakage. The tail is relatively thin and is connected to the acceleration cylinder by an interference fit, which can ensure a certain contact area and friction under static conditions, and ensure that the navigation body will not be pulled out of the acceleration cylinder due to pressure changes under static conditions. After installation, Figure 3 As shown, the blue portion shows the state after being squeezed and deformed by the inner wall in the mating state. Under dynamic conditions, it can also ensure sealing through sliding friction, while reducing the friction of the sliding seal. This ensures sealing while reducing kinetic energy loss.

[0045] In this embodiment, both the fixing portion 1 and the connecting portion 3 are made of an annular high-strength aluminum alloy with an anodized surface. They offer high strength, high temperature resistance, low density, and lightweight performance, meeting the requirements for use in negative pressure experiments. Materials with superior performance are not limited to these materials. The annular high-strength aluminum alloy sandwich structure offers structural strength and stability, and is reusable.

[0046] In this embodiment, the fixing portion 1 is provided with a plurality of radial holes on its circumference and a plurality of first axial holes on its end surface. Corresponding radial holes are provided on the circumferential wall of the vehicle, through which bolts are inserted to secure the fixing portion 1 to the vehicle. This detachable connection enhances convenience.

[0047] In this embodiment, a plurality of second axial holes corresponding to the positions of the first axial holes are provided on the end surfaces of the adaptive sealing portion 2 and the connecting portion 3. After the first and second axial holes are aligned, bolts can be passed through to secure the adaptive sealing portion 2, the connecting portion 3, and the adaptive sealing portion 2.

[0048] In this embodiment, the adaptive seal 2 is made of polyurethane or fluororubber. These materials are highly elastic and wear-resistant, ensuring structural strength and dynamic sealing. When the model enters air from underwater, the adaptive seal 2 automatically adjusts its deformation, ensuring that sealing performance is unaffected by changes in the medium, achieving dynamic self-adaptation while also reducing frictional resistance.

[0049] When the propulsion device is activated and the vehicle model accelerates, the adaptive seal 2 compresses with pressure and temperature changes to form a dynamic adaptive seal between the cylinder and the model. Once the model is released from the cylinder, it automatically adjusts its deformation and returns to its original state. If it becomes damaged after repeated use, it can be easily replaced to facilitate the next experiment.

[0050] The sensors, controllers and control programs that may be involved in the above description are all existing technologies and will not be described in detail.

[0051] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. An adaptive sealing structure for a negative pressure cross-medium rotating body experimental model, characterized in that: include: A fixing portion (1) for detachably connecting to a navigation body; The adaptive sealing portion (2) is connected to the fixing portion (1) and is a flexible structure in the shape of a truncated umbrella. When the vehicle is installed in the acceleration cylinder, it has an interference fit with the inner wall of the acceleration cylinder, so that the vehicle always adheres to the inner wall of the acceleration cylinder when moving in the acceleration cylinder. The connecting portion (3) is used to fix the adaptive sealing portion (2) on the fixing portion (1).

2. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 1, characterized in that: The fixing portion (1), the adaptive sealing portion (2) and the connecting portion (3) are coaxially arranged.

3. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 2, characterized in that: The fixing portion (1), the adaptive sealing portion (2) and the connecting portion (3) are connected in sequence.

4. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 1, characterized in that: The fixing portion (1), the adaptive sealing portion (2) and the connecting portion (3) are connected by bolts.

5. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 1, characterized in that: The fixing part (1) is connected to the navigation body via bolts.

6. The adaptive sealing structure of a negative pressure cross-medium rotating body experimental model according to any one of claims 1 to 5, characterized in that: The thickness of the adaptive sealing portion (2) gradually decreases from the side close to the fixing portion (1) to the side away from it.

7. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 6, characterized in that: The fixing portion (1) and the connecting portion (3) are both made of annular high-strength aluminum alloy.

8. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 6, characterized in that: The fixing portion (1) is provided with a plurality of radial holes on its circumferential side, and a plurality of first axial holes on its end surface.

9. The adaptive sealing structure of the negative pressure cross-medium rotating body experimental model according to claim 8, characterized in that: A plurality of second axial holes corresponding to the positions of the first axial holes are provided on the end surfaces of the adaptive sealing portion (2) and the connecting portion (3).

10. The adaptive sealing structure for a negative pressure cross-medium rotating body experimental model according to claim 1, 2, 3, 4, 5, 7, 8 or 9, characterized in that: The adaptive sealing part (2) is made of polyurethane or fluororubber.

Images