Underwater vibration acceleration sensor

Abstract

The utility model provides an underwater vibration acceleration sensor comprising a vibration core body, a first housing, an inner layer shielding assembly, a second layer shielding assembly, an outer layer housing, an IEPE circuit board and a shielding switching circuit board, and the vibration core body and the IEPE circuit board are both arranged in the inner layer shielding assembly. The two-layer shielding assembly is arranged on the periphery of the inner-layer shielding assembly, the outer-layer shell is arranged on the periphery of the two-layer shielding assembly, and the shielding switching circuit board is installed on the surface of the two-layer shielding assembly. The whole structure of the underwater vibration acceleration sensor is mini and compact, and the installation requirement of a narrow space and the real-time feedback of a vibration acceleration signal can be realized. A vibration sensitive element and signal output adopt a multi-layer shielding design with different functions, can stably work for a long time in a complex ocean deep water area working condition, and can effectively resist the problem of electromagnetic interference faced by complex ship equipment and matched hydrophone equipment.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to an underwater vibration acceleration sensor. Background Art

[0002] A vibration sensor is a test instrument that converts the forces generated by physical phenomena such as acceleration, vibration, and impact into a measurable electrical signal. A piezoelectric vibration sensor uses piezoelectric material as a conversion element, outputting a charge or voltage proportional to acceleration.

[0003] The underwater marine environment places extremely high pressure resistance requirements on sensors. Seawater corrosion and long-term water pressure pose severe challenges to the sensor's housing materials, sealing technology, and internal structure. Conventional sensors are prone to deformation, leakage, and even failure in high-pressure environments, making them unable to operate stably over the long term.

[0004] Moreover, outside the ship's cabin, there is not only the electromagnetic field generated by the ship itself, but also electromagnetic interference from surrounding hydrophone equipment, radar systems, etc. These interference sources may cause distortion of sensor output signals, affecting the accuracy and reliability of data.

[0005] In view of this, the present application proposes an underwater vibration acceleration sensor suitable for high ocean water pressure resistance and high electromagnetic interference immunity. Utility Model Content

[0006] In order to solve the problems that existing sensors cannot meet the requirements of high ocean water pressure resistance and high electromagnetic interference resistance, the present application provides an underwater vibration acceleration sensor to solve the technical defects existing in the existing technology.

[0007] The utility model proposes an underwater vibration acceleration sensor, which includes: a vibration core, a first shell, an inner shielding component, a second shielding component, an outer shell, an IEPE circuit board (Integrated Electronics Piezo-Electric, an integrated circuit voltage sensor) and a shielding adapter circuit board. The vibration core and the IEPE circuit board are both arranged inside the inner shielding component, the second shielding component is arranged on the periphery of the inner shielding component, the outer shell is arranged on the periphery of the second shielding component, and the shielding adapter circuit board is mounted on the surface of the second shielding component.

[0008] Preferably, an insulating layer is provided between the inner shielding assembly and the second shielding assembly, and an insulating layer is provided between the second shielding assembly and the outer shell.

[0009] Preferably, the inner shielding component includes: an inner shielding component upper body and an inner shielding component lower body, and the inner shielding component upper body and the inner shielding component lower body are sealed by laser welding; the second shielding component includes: a second shielding component upper body and a second shielding component lower body, and the second shielding component upper body and the second shielding component lower body are sealed by laser welding.

[0010] Preferably, it further comprises: a connector connected to one end of the outer shell, and the connector is provided with positive and negative signal pins.

[0011] Further preferably, the underwater vibration acceleration sensor provided in the present application also includes: a signal line, which is connected to the vibration core, and the signal line passes through the perforations of the inner shielding component and the second shielding component in turn and is connected to the positive and negative signal pins of the connector.

[0012] Further preferably, the underwater vibration acceleration sensor provided in the present application also includes: a transmission cable, the positive and negative signal pins of the connector are welded and connected to the transmission cable, and the circuit of the shielded adapter circuit board is connected to the positive and negative signal pins of the connector.

[0013] Further preferably, the transmission cable is fixed to the connector by vulcanized rubber coating.

[0014] Preferably, the underwater vibration acceleration sensor provided in the present application further includes: a sealing cover, which is arranged above the outer shell, and the connector and the sealing cover are sealed with the outer shell by laser welding.

[0015] Preferably, the shielding adapter circuit board is installed at the step on the upper surface of the second-layer shielding component.

[0016] Preferably, the sensor is provided with a bolt hole.

[0017] Compared with the prior art, the beneficial results of the present invention are:

[0018] (1) The sensor's carefully designed multi-layer shielding structure (inner shielding assembly, second shielding assembly) and rugged outer shell (outer shell) effectively improve its anti-interference ability and environmental adaptability, making it particularly suitable for complex underwater electromagnetic environments and high-voltage environments. The sensor body has a built-in vibration sensitive element, and the overall structure is mini and compact, which can meet the requirements of installation in small spaces and provide real-time feedback of vibration acceleration signals.

[0019] (2) An insulating layer is provided between the inner shielding component and the second shielding component, and between the second shielding component and the outer shell. The provision of the insulating layer effectively isolates the potential difference between different shielding layers, reduces the transmission of electromagnetic interference, and improves the electrical performance and measurement accuracy of the sensor.

[0020] (3) The inner shielding assembly and the second shielding assembly are sealed by laser welding. Laser welding technology provides a high-strength and high-precision sealing effect, ensuring the stability and waterproof performance of the internal components of the sensor, suitable for long-term underwater work.

[0021] (4) The welding connection between the transmission cable and the connector provides a stable signal transmission channel. At the same time, the shielding circuit board circuit is connected to the positive and negative signal pins of the connector, further enhancing the signal's anti-interference ability. The transmission cable is fixed to the connector through vulcanized rubber coating. The vulcanized rubber coating fixing technology provides a strong fixation and watertight effect, preventing the transmission cable from leaking, loosening or falling off in the underwater environment, ensuring the continuity of the signal and the stability of the sensor's internal functions.

[0022] (5) Bolt holes are provided on the sensor to facilitate the installation and fixation of the sensor, and 360° installation can be achieved, ensuring the stability and reliability of the sensor in the monitoring system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate the embodiments and, together with the description, serve to explain the principles of the present invention. Other embodiments and many of the expected advantages of the embodiments will be readily apparent as they become better understood by reference to the following detailed description. The elements of the drawings are not necessarily to scale with respect to each other. Like reference numerals designate corresponding similar parts.

[0024] Figure 1 1 is a schematic structural diagram of an underwater vibration acceleration sensor according to a specific embodiment of the present utility model;

[0025] Figure 2 The figure is a connection diagram of an underwater vibration acceleration sensor according to a specific embodiment of the utility model.

[0026] The meaning of the numbers in the figure: 1-outer shell, 2-second layer shielding assembly, 3-vibration core, 4-inner layer shielding assembly, 5-IEPE circuit board, 6-shielded adapter circuit board, 7-sealing cover, 8-connector, 9-positive and negative signal pins, 10-vulcanized rubber coating, 11-transmission cable, 12-bolt hole. DETAILED DESCRIPTION

[0027] In the following detailed description, reference is made to the accompanying drawings, which form a part of the detailed description and are shown by way of illustrative specific embodiments in which the present invention may be practiced. In this regard, directional terms, such as "top," "bottom," "left," "right," "up," "down," etc., are used with reference to the orientation of the figures being described. Because the components of the embodiments may be positioned in several different orientations, directional terms are used for illustrative purposes and are in no way limiting. It should be understood that other embodiments may be utilized or logical changes may be made without departing from the scope of the present invention. The following detailed description should therefore not be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

[0028] Figure 1 The figure shows a schematic structural diagram of an underwater vibration acceleration sensor according to a specific embodiment of the present invention. Figure 2 The schematic diagram of the underwater vibration acceleration sensor of a specific embodiment of the present invention is shown. Figure 1 and Figure 2 The underwater vibration acceleration sensor includes: an outer shell 1, a second-layer shielding component 2, a vibration core 3, an inner shielding component 4, an IEPE circuit board 5, a shielding adapter circuit board 6, a sealing cover 7 and a connector 8.

[0029] Among them, the vibration core 3 of the vibration module core component of the sensor is fixed to the inner shielding component 4 by annular extrusion and hugging, and the IEPE circuit board 5 is built into the inner shielding component 4. The second-layer shielding component 2 is arranged on the periphery of the inner shielding component 4, and the upper body of the inner shielding component and the lower body of the inner shielding component are sealed by laser welding to form the inner shielding component 4. An insulating layer is provided between the inner shielding component 4 and the second-layer shielding component 2. Preferably, the inner shielding component 4 and the second-layer shielding component 2 are fixed by epoxy resin insulation bonding. Similarly, the upper body of the second-layer shielding component and the lower body of the second-layer shielding component are also sealed by laser welding to form the second-layer shielding component 2. The second-layer shielding component 2 is built into the outer shell 1, and an insulating layer is provided between the second-layer shielding component 2 and the outer shell 1. Preferably, the second-layer shielding component 2 and the outer shell 1 are fixed by epoxy resin insulation bonding.

[0030] Connector 8 is connected to one end of the outer shell 1 and is equipped with positive and negative signal pins 9. A shielded adapter circuit board 6 is placed externally on the upper surface step of the second-layer shielding component 2. The internal signal line of the process is connected to the vibration core 3. The internal signal line of the process is led out through holes in the inner shielding component 4 and the second-layer shielding component 2 and is connected to the positive and negative signal pins 9 of connector 8. The circuit of the shielded adapter circuit board 6 is ultimately connected to the pins 9 connected to the shielding layer of the watertight transmission cable 11. It should be understood that the positive and negative signal pins 9 of connector 8 are part of the shielded adapter circuit board 6. They are directly connected to the internal signal lines and are used to receive signals from the vibration core 3. These signal pins are contact points on the circuit board and are responsible for transmitting the signal inside the sensor to the outside. The pins 9 connected to the shielding layer of the watertight transmission cable 11 are also the same set of pins. They are connected not only to the shielded adapter circuit board 6 but also to the shielding layer of the watertight cable 11. This design ensures continuous signal transmission and provides protection from external electromagnetic interference through the shielding layer.

[0031] Sealing cover 7 is placed above outer shell 1. Connector 8 and sealing cover 7 are sealed to outer shell 1 by continuous laser welding with a thickness of 0.8mm or greater. Watertight transmission cable 11 is welded to positive and negative signal pins 9 and finally secured to connector 8 with vulcanized rubber coating 10.

[0032] In a specific embodiment, the outer shell 1 is obtained by passivation process of 316L stainless steel, which can enhance the long-term durability of the sensor under deep ocean water (high water pressure) conditions.

[0033] In a specific embodiment, the sensor body is provided with a bolt hole 12. The use of a central bolt hole allows for 360-degree installation of the sensor, solving problems such as narrow installation space limitations and cable output direction matching on-site.

[0034] In a specific embodiment, the outer shell 1, the second shielding assembly 2 and the inner shielding assembly 4 are all made of metal materials.

[0035] In a specific embodiment, the transmission cable 11 is a longitudinally glue-filled watertight cable.

[0036] This utility model proposes an underwater vibration acceleration sensor. Its built-in vibration core structure utilizes three layers of sealed metal shells, each insulated from the other to form a triple-shield effect. The outer shell shield allows for direct mounting on the hull (equivalent ground connection), effectively dissipating external electromagnetic interference signals. The second layer is a built-in independent shield, connected to the shielded adapter circuit board and the transmission cable shield, dissipating electromagnetic interference signals. The innermost layer, consisting of the vibration core and IEPE (signal conversion and amplification) circuit board, effectively shields the signals generated by the core component, the vibration core, and the circuit conversion signals from external residual electromagnetic noise. The signal output utilizes a longitudinal, watertight, glue-filled cable and an adapter connector, sealed by injection molding. This design achieves a water pressure resistance of 10 MPa (1000 m water depth), making it suitable for high-pressure environments. The sensor body incorporates a built-in vibration sensor, resulting in a compact design that can be installed in confined spaces and provides real-time feedback of vibration acceleration signals. The vibration sensitive elements and signal output adopt a multi-layer shielding design with different functions, which can effectively solve the anti-interference problem of complex ship equipment and supporting hydrophone equipment in the electromagnetic environment.

[0037] Obviously, those skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and changes are within the scope of the claims of the present invention and their equivalents, the present invention is also intended to cover these modifications and changes. The word "comprising" does not exclude the presence of other elements or steps not listed in the claims. The simple fact that certain measures are recited in mutually different dependent claims does not indicate that the combination of these measures cannot be used to advantage. Any reference signs in the claims should not be considered as limiting the scope.

Claims

1. An underwater vibration acceleration sensor, characterized in that: include: A vibration core, a first shell, an inner shielding component, a second shielding component, an outer shell, an IEPE circuit board and a shielding adapter circuit board. The vibration core and the IEPE circuit board are both arranged inside the inner shielding component, the second shielding component is arranged on the periphery of the inner shielding component, the outer shell is arranged on the periphery of the second shielding component, and the shielding adapter circuit board is installed on the surface of the second shielding component.

2. An underwater vibration acceleration sensor as claimed in claim 1, characterized in that: An insulating layer is provided between the inner shielding component and the second shielding component, and an insulating layer is provided between the second shielding component and the outer shell.

3. An underwater vibration acceleration sensor as claimed in claim 1, characterized in that: The inner shielding component includes: an inner shielding component upper body and an inner shielding component lower body, and the inner shielding component upper body and the inner shielding component lower body are sealed by laser welding; the second-layer shielding component includes: a second-layer shielding component upper body and a second-layer shielding component lower body, and the second-layer shielding component upper body and the second-layer shielding component lower body are sealed by laser welding.

4. An underwater vibration acceleration sensor according to claim 1, characterized in that: Also includes: A connector is connected to one end of the outer shell and is provided with positive and negative signal pins.

5. An underwater vibration acceleration sensor as claimed in claim 4, characterized in that: Also includes: A signal line is connected to the vibration core, and the signal line passes through the perforations of the inner shielding component and the second shielding component in sequence and then is connected to the positive and negative signal pins of the connector.

6. An underwater vibration acceleration sensor as claimed in claim 4, characterized in that: Also includes: The positive and negative signal pins of the connector are welded to the transmission cable, and the circuit of the shielded adapter circuit board is connected to the positive and negative signal pins of the connector.

7. An underwater vibration acceleration sensor as claimed in claim 6, characterized in that: The transmission cable is fixed to the connector by vulcanized rubber.

8. An underwater vibration acceleration sensor as claimed in claim 4, characterized in that: Also includes: A sealing cover is provided above the outer shell, and the connector, the sealing cover and the outer shell are sealed by laser welding.

9. The underwater vibration acceleration sensor according to claim 1, wherein: The shielding adapter circuit board is mounted on the step on the upper surface of the second-layer shielding component.

10. The underwater vibration acceleration sensor according to claim 1, characterized in that: The sensor is provided with a bolt hole.

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