An adaptive variable flow-facing surface drag device and its manufacturing method

Abstract

The present invention discloses a damper with an adaptive variable flow-facing surface, which relates to the field of underwater acoustic detection. It includes a number of basic damper units. Each basic damper unit includes a conical rubber membrane, a fixing ring, and a clamping ring. One end of the fixing ring is provided with an inner groove for cooperating with the clamping ring to clamp and fix the conical rubber membrane. Three rope-passing holes are evenly distributed along the circumference of the fixing ring. The three-claw ropes respectively pass through the three rope-passing holes on the fixing rings of the basic damper units to connect the basic damper units in sequence. A fixing buckle is sleeved on the three-claw rope below each fixing ring to restrict the position of the fixing ring on the three-claw rope. The head of the three-claw rope is connected to the tail of the receiving array. By utilizing the high elasticity and high ductility characteristics of natural rubber, the present invention designs and processes it into a conical thin film, using the thin film as the main flow-facing surface. At low speeds, the fluid pressure on the thin film is small, the opening of the thin film is small, and the provided flow-facing surface is large; when the speed increases, the fluid pressure increases, the opening of the thin film increases, and the provided flow-facing surface decreases accordingly.

Description

Technical Field

[0001] The present invention relates to the field of underwater acoustic detection, and particularly relates to a resistance device with an adaptive variable flow-facing surface and a manufacturing method thereof. Background Art

[0002] When a towed line array receiver is towed underwater, it needs to maintain a straight array shape to obtain good spatial gain. However, the towed line array does not have a uniform density in the length direction. Especially when towed at a low speed, the fluid resistance acting on the line array is small, and the receiving array will be in an S shape in the vertical plane. Therefore, a resistance device needs to be mounted at the tail of the receiving array to provide a backward pulling force to straighten the receiving array.

[0003] According to the hydrodynamic resistance formula F d = 0.5ρv 2 C d S, the resistance generated by the resistance device during underwater towing is proportional to the flow-facing surface S and proportional to the square of the velocity v 2 proportional. Therefore, a large resistance is generated during high-speed towing, which will cause a great burden on the equipment. It is required that the resistance device can provide a large resistance during low-speed towing and the resistance provided during high-speed towing is not too large. The present invention adopts an adaptive variable flow-facing surface design, that is, the flow-facing surface S automatically decreases as the towing speed v increases. At the same time, the resistance device needs to be close to the density of seawater, and the convenience during use also needs to be considered, so there are constraints on the selection of materials. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies existing in the prior art, and provide a resistance device with an adaptive variable flow-facing surface, which is mounted behind an underwater towing body such as a towed line array receiver to increase the resistance of the towing body and improve the attitude of the towing body.

[0005] The purpose of the present invention is achieved by the following technical solutions: a resistance device with an adaptive variable flow-facing surface, including a plurality of basic resistance units. Each basic resistance unit includes a conical rubber membrane, a fixing ring, and a clamping ring. One end of the fixing ring is provided with an inner groove for cooperating with the clamping ring to clamp and fix the conical rubber membrane; three rope holes are evenly distributed along the circumference of the fixing ring, and three-claw ropes respectively pass through the three rope holes on the fixing ring of each basic resistance unit to connect the basic resistance units in sequence; a fixing buckle is sleeved on the three-claw rope below each fixing ring to restrict the position of the fixing ring on the three-claw rope; the head of the three-claw rope is connected to the tail of the receiving array.

[0006] As a preferred technical solution, the conical rubber membrane is made of natural rubber, and both ends are open and curled.

[0007] As a preferred technical solution, the fixing ring and the clamping ring are made by injection molding of polycarbonate, and the conical rubber film is bonded to the fixing ring with an adhesive.

[0008] As a preferred technical solution, the fixing buckle is made of pure copper.

[0009] As a preferred technical solution, the number of the basic resistance units is adjusted according to the required pulling force.

[0010] A manufacturing method of a resistance device with an adaptive variable flow-facing surface includes the following steps:

[0011] 1) Apply a small amount of adhesive evenly in the inner groove on the end face of the fixing ring, and press the made conical rubber film into the inner groove with the clamping ring, and the three form a basic resistance unit;

[0012] 2) Repeat step 1) to obtain several basic resistance units according to the actual pulling force requirement;

[0013] 3) Pass the three-claw rope through the three rope-passing holes on the fixing ring of each basic resistance unit respectively, and hang the same heavy object at the ends of the three ropes of the three-claw rope;

[0014] 4) After adjusting each basic resistance unit to be horizontal, put a fixing buckle on the three-claw rope below the fixing ring, and clamp it with a clamping pliers.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. Large resistance design: It can provide a large resistance even at low speeds;

[0017] 2. Adaptive variable flow-facing surface design: As the towing speed increases, the provided resistance cannot increase too much, and the variable resistance design is realized by using the method of adaptive variable flow-facing surface;

[0018] 3. Zero buoyancy design: The whole needs to be close to the density of seawater, reducing the use of metals. The main material is natural rubber, and the structural parts are made of polycarbonate with good creep resistance and dimensional stability;

[0019] 4. Convenient operation and safety: It is suitable for ship deck operation. It is necessary to consider the convenient disassembly and assembly during the retraction and deployment of the personnel's standing position, and at the same time, the safety of the equipment and personnel should be considered. Description of the Drawings

[0020] Figure 1 It is a structural schematic diagram of the present invention.

[0021] Figure 2 It is a structural sectional view of the present invention.

[0022] Description of reference numerals: conical rubber membrane 1, fixing ring 2, clamping ring 3, three-claw rope 4, fixing buckle 5. Detailed implementation manners

[0023] The present invention will be described in detail below with reference to the accompanying drawings:

[0024] Embodiment: As shown in the attached Figure 1 , 2 figures, a resistance device with an adaptive variable flow-facing surface includes three basic resistance units (three in this embodiment, and can also be multiple, and the number of basic resistance units is adjusted according to the required pulling force). Each basic resistance unit includes a conical rubber membrane 1, a fixing ring 2, and a clamping ring 3. One end of the fixing ring 2 is provided with an inner groove for cooperating with the clamping ring 3 to clamp and fix the conical rubber membrane 1. Three rope-passing holes are evenly distributed along the circumference of the fixing ring 2, and the three-claw ropes 4 respectively pass through the three rope-passing holes on the fixing ring 2 of each basic resistance unit to sequentially connect the basic resistance units. A fixing buckle 5 with a C-shaped opening is sleeved on the three-claw rope 4 below each fixing ring 2 for restricting the position of the fixing ring 2 on the three-claw rope 4. The head of the three-claw rope 4 is connected to the tail of the receiving array.

[0025] Preferably, the conical rubber membrane 1 is made of natural rubber with high elasticity / high ductility, and both ends thereof are open and curled to improve strength and prevent tearing. The fixing ring 2 and the clamping ring 3 are injection-molded from polycarbonate, and the conical rubber membrane 1 and the fixing ring 2 are bonded by a low-strength adhesive. After the fixing ring 2, the conical rubber membrane 1, and the clamping ring 3 are installed, a basic resistance unit is formed. The fixing buckle 5 is made of pure copper.

[0026] A manufacturing method of a resistance device with an adaptive variable flow-facing surface includes the following steps:

[0027] 1) Uniformly apply a small amount of adhesive in the inner groove on the end face of the fixing ring 2, and press the made conical rubber membrane 1 into the inner groove with the clamping ring 3, and the three form a basic resistance unit;

[0028] 2) Repeat step 1) to obtain a plurality of basic resistance units according to the actual pulling force requirement;

[0029] 3) Pass the three-claw ropes 4 through the three rope-passing holes on the fixing ring 2 of each basic resistance unit respectively, and tie the same heavy objects to the ends of the three ropes of the three-claw rope 4 for hanging;

[0030] 4) After adjusting each basic resistance unit to be horizontal, put the fixing buckle 5 on the three-claw rope 4 below the fixing ring 2 and clamp it with a crimping pliers. During use, connect the head of the three-claw rope 4 to the tail of the receiving array, and throw the resistance device into the water.

[0031] The present invention utilizes the high elasticity and high ductility characteristics of natural rubber to design and process it into a conical film. Taking this film as the main flow-facing surface, at low speeds, the fluid pressure on it is small, the opening of the film is small, and the provided flow-facing surface is large; when the speed increases, the fluid pressure increases, the opening of the film increases, and the provided flow-facing surface decreases accordingly. At the same time, modular design is adopted. The film is assembled into a basic drag unit through a fixing ring and a clamping ring. The basic drag unit is installed on a three-claw rope, and the number of drag units can be adjusted according to actual usage requirements, effectively increasing the drag of the drag body and improving the attitude of the drag body.

[0032] It can be understood that for those skilled in the art, equivalent substitution or modification of the technical solutions and inventive concepts of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. An adaptive variable oncoming flow surface damper, characterized in that: It includes a number of basic resistance units. Each basic resistance unit includes a conical rubber membrane (1), a fixing ring (2) and a clamping ring (3). One end of the fixing ring (2) is provided with an inner groove for cooperating with the clamping ring (3) to clamp and fix the conical rubber membrane (1). Three rope-passing holes are evenly distributed along the circumference of the fixing ring (2). The three-claw ropes (4) respectively pass through the three rope-passing holes on the fixing ring (2) of each basic resistance unit to connect the basic resistance units in sequence. A fixing buckle (5) is sleeved on the three-claw rope (4) below each fixing ring (2) to restrict the position of the fixing ring (2) on the three-claw rope (4). The head of the three-claw rope (4) is connected to the tail of the receiving array. The conical rubber membrane (1) is made of natural rubber, and both ends thereof are open and subjected to curling treatment. The fixing ring (2) and the clamping ring (3) are injection-molded from polycarbonate, and the conical rubber membrane (1) is bonded to the fixing ring (2) by an adhesive. The fixing buckle (5) is made of pure copper. The number of the basic resistance units is adjusted according to the required pulling force.

2. A method for manufacturing a resistance device with an adaptive variable flow-facing surface as described in claim 1, characterized in that: It includes the following steps: 1) Apply a small amount of adhesive evenly in the inner groove on the end face of the fixing ring (2), and press the made conical rubber membrane (1) into the inner groove with the clamping ring (3), and the three form a basic resistance unit. 2) Repeat step 1) to obtain a number of basic resistance units according to the actual pulling force requirement. 3) Pass the three-claw ropes (4) respectively through the three rope-passing holes on the fixing ring (2) of each basic resistance unit, and tie the same heavy object to the ends of the three ropes of the three-claw rope (4) for hanging. 4) After adjusting each basic resistance unit to be horizontal, sleeved the fixing buckle (5) on the three-claw rope (4) below the fixing ring (2), and clamp it with a crimping pliers.

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