A watertight rubber sleeve based on electromagnetic shielding and supporting functions and its assembly method

Abstract

The present invention relates to a watertight rubber sleeve based on electromagnetic shielding and supporting functions and an assembly method thereof, comprising an upper watertight sleeve and a lower watertight sleeve which are assembled and arranged from top to bottom, a shielding layer is arranged between the upper watertight sleeve and the lower watertight sleeve, the shielding layer is a composite plate structure, the shielding layer comprises a metal conductive mesh as a core layer and sound-permeable material layers located on both sides of the core layer, the upper watertight sleeve, the shielding layer and the lower watertight sleeve are fixed by vulcanization, wherein the shielding layer is also provided with a shielding layer lead hole and a shielding layer positioning hole. The present invention can improve the electromagnetic shielding capability of the watertight layer of the transducer and reduce the process difficulty.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrophones, and in particular relates to a watertight rubber sleeve based on electromagnetic shielding and supporting functions and an assembly method thereof. Background Art

[0002] Among various means of information transmission, sound waves are the only information carrier that can be transmitted over long distances in the ocean. With the increasing demand for the ocean, hydroacoustic technology has made great progress. Sonar receiving equipment is the main way to obtain underwater information. Its function is to listen to useful signals in the water and convert them into electrical signals for audio and video. As the front end of sonar to obtain ocean sound signals, hydrophones are specially used to obtain external information. The quality of their performance is of great significance to the overall performance of sonar equipment, and has always been one of the focuses of hydroacoustic technology research.

[0003] At present, hydrophones are the most widely used underwater signal receiving devices. The sensitive components of these devices are mostly made of piezoelectric materials, and then watertightened by rubber vulcanization or polyurethane infusion. The analog signal output by the hydrophone is a weak signal with poor anti-interference ability. When exposed to a complex electromagnetic environment, it is easily interfered by the electromagnetic signal in the medium, thereby affecting the receiving performance of the hydrophone and reducing the signal-to-noise ratio of the received signal. For hydrophones installed on platforms such as ships and submarines, the electromagnetic radiation generated by various high-power electrical equipment on the platform has a significant impact on the receiving performance of the hydrophone. One of the methods for traditional hydrophones to resist electromagnetic interference is to wrap a shielding layer around the core wire of the transmission cable, but this method can only prevent interference during signal transmission, and does not improve the anti-interference ability of the hydrophone signal receiving device. Some point element hydrophones use metal shells to shield electromagnetic interference, but the metal shell will affect the propagation of acoustic signals to a certain extent, thereby affecting the performance of the hydrophone. In addition, some hydrophones use a metal shielding layer vulcanized outside the insulating sound-transmitting layer to improve the anti-interference ability of the hydrophone.

[0004] At present, one electromagnetic shielding method used for the facet hydrophone is to sulfide the copper mesh in the rubber sleeve. However, the precise positioning process of the copper mesh is difficult in this method. During the sulfidation process, the copper mesh is prone to folding with the flow of the rubber, and the edge of the copper mesh is prone to pierce the edge of the rubber and contact the internal sensor device, causing a short circuit. Therefore, for the facet hydrophone, it is necessary to develop an electromagnetic shielding device to reduce the process difficulty of the facet hydrophone shielding layer without affecting the impedance matching between the hydrophone and water, thereby improving the signal-to-noise ratio of the received signal. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a watertight rubber sleeve based on electromagnetic shielding and supporting functions and an assembly method thereof, aiming to improve the electromagnetic shielding capability of the transducer watertight layer and reduce the process difficulty.

[0006] The technical solution of the present invention is to provide a watertight rubber sleeve based on electromagnetic shielding and supporting functions, including an upper watertight sleeve and a lower watertight sleeve which are assembled up and down, a shielding layer is arranged between the upper watertight sleeve and the lower watertight sleeve, the shielding layer is a composite plate structure, the shielding layer includes a metal conductive mesh as a core layer and sound-permeable material layers located on both sides of the core layer, the upper watertight sleeve, the shielding layer and the lower watertight sleeve are vulcanized and fixed, wherein the shielding layer is also provided with a shielding layer lead hole and a shielding layer positioning hole.

[0007] The present invention is based on the conventional method of using an embedded copper mesh in the rubber sleeve of the existing facet hydrophone to improve the anti-electromagnetic interference capability of the watertight layer. However, the copper mesh is soft in texture, prone to folding, tearing, etc., and difficult to evenly and accurately position in the rubber, and has the disadvantages of high difficulty in vulcanization. After bonding the sound-transmitting material layer on both sides of the metal conductive mesh, it is pressed into a thin plate shape, and then the composite plate is vulcanized in the watertight sleeve, which can effectively reduce the problem of easy deformation and difficult positioning of the shielding layer. Among them, the supporting function of the shielding layer is realized by the sound-transmitting material, and the shielding function is realized by the metal conductive mesh.

[0008] As a preference, the upper watertight sleeve and the lower watertight sleeve are rubber sleeves. The rubber watertight layer can be made of other watertight materials such as polyurethane.

[0009] Preferably, the metal conductive mesh is a copper mesh, and the sound-permeable material layer is a carbon fiber cloth. The copper mesh can be made of other metals with good conductivity or conductive elastomers.

[0010] Preferably, the copper mesh and the carbon fiber cloth are bonded and fixed.

[0011] Preferably, the rubber sleeve is provided with a positioning groove for fixing the sensor, and the positioning groove can be adjusted accordingly according to the shape and size of the sensor.

[0012] The present invention also provides an assembly method of the watertight rubber sleeve based on the electromagnetic shielding and supporting functions, comprising the following steps:

[0013] Step 1: Apply epoxy glue evenly on the surface of carbon fiber cloth and copper mesh, and stack them in the bonding mold as required for mold closing;

[0014] Step 2: Place the bonding mold on a vulcanizer for heating and pressurizing to cure;

[0015] Step 3: After demoulding the bonding mold, processing the shielding layer lead-out hole and the shielding layer positioning hole on the formed composite board;

[0016] Step 4: Cut the rubber sheet to a suitable size and evenly spread it in the rubber sleeve vulcanization mold for preforming;

[0017] Step 5: Place the composite plate between two preformed rubber sleeves, and let the positioning posts on the mold pass through the positioning holes of the shielding layer on the composite plate. Then close the mold and place it on a vulcanizer for heating and pressurizing to cure.

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

[0019] The present invention adheres carbon fiber cloth to both sides of the copper mesh and presses them into a thin plate, and then vulcanizes the composite plate in the rubber, which can effectively reduce the problem that the shielding layer is easy to deform and difficult to position. Among them, the composite plate of the inner layer of the watertight rubber sleeve can play a role in electromagnetic shielding after being grounded; the composite plate vulcanized in the rubber sleeve can also play a supporting role for the rubber sleeve, so that the large-area rubber sleeve is not easy to be dented and deformed; at the same time, the manufacturing process is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of a watertight sleeve in an embodiment of the present invention.

[0021] Figure 2 is a cross-sectional view of an embodiment of the present invention.

[0022] Figure 3 It is a side view of the shielding layer of an embodiment of the present invention.

[0023] Figure 4 It is a top view of the shielding layer of an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings:

[0025] The present invention proposes a watertight rubber sleeve based on electromagnetic shielding and supporting functions, such as Figure 1-4 As shown, it includes an upper watertight rubber sleeve 1 and a lower watertight rubber sleeve 2 which are assembled from top to bottom. A shielding layer is arranged between the upper watertight rubber sleeve 1 and the lower watertight rubber sleeve 2. The shielding layer is a composite plate 3. The upper watertight rubber sleeve 1, the composite plate 3 and the lower watertight rubber sleeve 2 are fixed by vulcanization. The composite plate 3 includes a metal conductive mesh as a core layer and a sound-transmitting material layer located on both sides of the core layer. In this embodiment, the metal conductive layer is a copper mesh 3.2, and the sound-transmitting material layer is a carbon fiber cloth 3.1. The carbon fiber cloth 3.1 is pasted on both sides of the copper mesh 3.2 and pressed into a carbon fiber-copper mesh composite plate 3; two Φ3cm shielding layer lead-out holes 5 are provided on the carbon fiber cloth 3.1 on one side of the composite plate 3 for shielding layer lead wires; two Φ2mm through holes are also provided on the composite plate 3, which are shielding layer positioning holes 4 for precise positioning in the rubber sleeve; and corresponding positioning grooves for fixing sensors are also provided on the upper watertight rubber sleeve and the lower watertight rubber sleeve.

[0026] The watertight rubber sleeve with multiplexed electromagnetic shielding and supporting functions proposed by the present invention realizes the multiplexed electromagnetic shielding and supporting functions by means of a built-in carbon fiber-copper mesh composite plate.

[0027] The assembly method of the watertight rubber sleeve based on the electromagnetic shielding and supporting functions comprises the following steps:

[0028] Step 1: Apply epoxy glue evenly on the surface of carbon fiber cloth and copper mesh, and stack them in the bonding mold as required for mold closing;

[0029] Step 2: Place the bonding mold on a vulcanizer for heating and pressurizing to cure;

[0030] Step 3: After demoulding the bonding mold, processing the shielding layer lead-out hole and the shielding layer positioning hole on the formed composite board;

[0031] Step 4: Cut the rubber sheet to a suitable size and evenly spread it in the rubber sleeve vulcanization mold for preforming;

[0032] Step 5: Place the composite plate between two preformed rubber sleeves, and let the positioning posts on the mold pass through the positioning holes of the shielding layer on the composite plate. Then close the mold and place it on a vulcanizer for heating and pressurizing to cure.

[0033] The above is only an explanation of the preferred embodiments of the present invention, which should not be construed as a limitation on the claims. Any equivalent process changes made using the present invention specification are included in the patent protection scope of the present invention.

Claims

1. A watertight rubber sleeve based on electromagnetic shielding and supporting functions, characterized in that: It includes an upper watertight sleeve and a lower watertight sleeve which are assembled from top to bottom. A shielding layer is arranged between the upper watertight sleeve and the lower watertight sleeve. The shielding layer is a composite plate structure. The shielding layer includes a metal conductive mesh as a core layer and sound-permeable material layers located on both sides of the core layer. The upper watertight sleeve, the shielding layer and the lower watertight sleeve are fixed by vulcanization. The shielding layer is also provided with a shielding layer lead hole and a shielding layer positioning hole. Among them, the metal conductive mesh is a copper mesh, and the sound-permeable material layer is a carbon fiber cloth.

2. The watertight rubber sleeve with electromagnetic shielding and supporting functions according to claim 1 is characterized in that: The upper water-tight sleeve and the lower water-tight sleeve are rubber sleeves.

3. The watertight rubber sleeve based on electromagnetic shielding and supporting functions according to claim 1 is characterized in that: The copper mesh and carbon fiber cloth are bonded and fixed.

4. The watertight rubber sleeve with electromagnetic shielding and supporting functions according to claim 2 is characterized in that: The rubber sleeve is provided with a positioning groove for fixing the sensor.

5. An assembly method of a watertight rubber sleeve based on electromagnetic shielding and supporting functions according to any one of claims 1 to 4, characterized in that: The following steps are included: Step 1: Apply epoxy glue evenly on the surface of carbon fiber cloth and copper mesh, and stack them in the bonding mold as required for mold closing; Step 2: Place the bonding mold on a vulcanizer for heating and pressurizing to cure; Step 3: After demoulding the bonding mold, processing the shielding layer lead-out hole and the shielding layer positioning hole on the formed composite board; Step 4: Cut the rubber sheet to a suitable size and evenly spread it in the rubber sleeve vulcanization mold for preforming; Step 5: Place the composite plate between two preformed rubber sleeves, and the positioning column on the mold passes through the positioning hole of the shielding layer of the composite plate, and then place the mold on a vulcanizer for heating and pressurization for curing.

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