High-performance lightweight pressure sensor

Abstract

The utility model discloses a high-performance light-weight pressure sensor, which comprises a filler neck, a pressure core body, a conversion circuit board, a support, a signal processing board, a primary shell, a power supply filter board, a secondary shell and an electric connector, the conversion circuit board is installed on the output side of the pressure core through a pin structure, one end of the support is fixed to the outer edge of a pressure sensing cavity of the core, the signal processing board is installed at the other end of the support, one end of the first-stage shell arranged outside the support in a sleeving mode is fixed to the filler neck, and the power filter board is installed at the other end of the first-stage shell and used for being connected with one end of the second-stage shell. And the other end of the secondary shell is provided with an electric connector. According to the utility model, the conversion circuit board, the signal processing board and the power supply filtering board are respectively arranged on different parts, so that electromagnetic interference between adjacent circuit boards is avoided, the electromagnetic interference inside the sensor is reduced, and the product precision grade is improved.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically a high-performance lightweight pressure sensor. Background Technology

[0002] The development of high-performance, lightweight sensors relies on advancements in materials science and innovations in manufacturing processes. For example, the use of all-MEMS (Micro-Electro-Mechanical Systems) fabrication technology enables sensors to achieve small size and high-temperature resistance. Furthermore, pressure sensors are evolving towards miniaturization, standardization, and generalization, which helps improve performance and reduce costs. High-performance, lightweight sensors have wide applications in military and aerospace fields. They typically employ the piezoresistive principle, converting pressure into resistance, and then using circuitry to convert this resistance change into an electrical signal, thus achieving pressure measurement. Compared to similar sensors, they lack mechanical transmission structures, completely eliminating frictional errors and significantly improving the sensor's accuracy, corrosion resistance, shock resistance, interference immunity, and reliability.

[0003] Currently used pressure sensors are large in size and have significant measurement errors. These errors primarily originate from ambient temperature and electromagnetic interference. Errors caused by ambient temperature are typically eliminated using temperature compensation techniques, while errors due to electromagnetic interference are generally eliminated using electromagnetic shielding techniques. However, electromagnetic shielding only eliminates external electromagnetic interference, resulting in relatively low accuracy for current sensors. With the advancement of national science and technology, fields such as aerospace and weaponry demand increasingly higher accuracy and reliability from these sensors, which traditional pressure sensors can no longer meet. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies, such as low measurement accuracy and large mass and volume, by providing a high-performance, lightweight pressure sensor that can reduce internal and external electromagnetic interference.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A high-performance, lightweight pressure sensor is characterized in that: the sensor includes a connector, a pressure core, a conversion circuit board, a bracket, a signal processing board, a primary housing, a power filter board, a secondary housing, and an electrical connector. The pressure core is installed inside a pressure-sensing cavity within the connector. The conversion circuit board is installed on the output side of the pressure core via a pin structure. One end of the bracket is fixed to the outer edge of the pressure-sensing cavity, and the other end is fitted with the signal processing board. One end of the primary housing, which is fitted outside the bracket, is fixed to the connector, and the other end is fitted with the power filter board and used to connect to one end of the secondary housing. The other end of the secondary housing is fitted with an electrical connector.

[0007] The conversion circuit board is connected to the signal processing board via a circuit, the signal processing board is connected to the power filter board via a circuit, and the power filter board is connected to the electrical connector via a circuit. The pressure signal collected by the pressure sensor reaches the pressure-sensing diaphragm of the pressure core through the connector. The pressure-sensing diaphragm transmits the signal to the pressure-sensing chip and generates an electrical signal. The electrical signal output by the pressure core reaches the conversion circuit board and is converted into a millivolt-level voltage signal or a milliampere-level current signal. The signal processing board converts the millivolt-level voltage signal or milliampere-level current signal output by the conversion circuit board into a voltage signal or current signal that meets the requirements, and then transmits it to the power filter board through a wire. The power filter board compensates and amplifies the voltage signal or current signal, and outputs a voltage signal or current signal that meets the accuracy requirements through the electrical connector.

[0008] The outer periphery of the connector is provided with a connector step ring for positioning and installing the primary housing. One end of the primary housing is embedded outside the connector step ring and the two are welded together.

[0009] The primary outer shell is fitted over the pressure-sensing cavity of the core, and there is a gap between the inner wall of the primary outer shell and the outer wall of the pressure-sensing cavity of the core.

[0010] The outer periphery of the core pressure-sensing cavity is provided with a cavity step ring for positioning and mounting brackets. One end of the bracket is embedded outside the cavity step ring and the two are welded and fixed together.

[0011] The inner wall of the bracket has several bracket protrusions at one end, and the signal processing board is fixedly installed on the bracket protrusions.

[0012] The outer periphery of the primary shell is provided with a shell step ring for positioning and installing the secondary shell. One end of the secondary shell is embedded outside the shell step ring and the two are welded and fixed together.

[0013] Several housing protrusions are arranged on one end of the inner wall of the primary housing, and the power filter board is fixedly installed on the housing protrusions.

[0014] The primary and secondary outer shells are made of stainless steel.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] This invention improves the installation method of the circuit board, makes efficient use of space, and reduces electromagnetic interference between circuit boards by installing the circuit board on the outer shell. Compared with the traditional design that requires the circuit board to be installed on the bracket, it can reduce the weight by more than 10%.

[0017] This invention effectively controls the spacing between adjacent circuit boards by mounting the conversion circuit board, signal processing board, and power filter board on different components, thereby avoiding electromagnetic interference between adjacent circuit boards, reducing electromagnetic interference inside the sensor, and improving the product's accuracy to over 0.2%.

[0018] The sensor of this invention adopts a fully sealed stainless steel shell design, which is lightweight and has strong overall sealing performance. It can effectively shield electromagnetic interference inside and outside the sensor, thereby ensuring the stability of product performance. Attached Figure Description

[0019] Appendix Figure 1 A schematic diagram of the structure of the high-performance lightweight pressure sensor provided by this utility model;

[0020] Appendix Figure 2 For the appendix Figure 1 Schematic diagram of the AA section structure;

[0021] Appendix Figure 3 A schematic diagram of the axial structure of the high-performance lightweight pressure sensor provided by this utility model;

[0022] Appendix Figure 4 An exploded view of the high-performance, lightweight pressure sensor provided by this utility model when the circuit board is removed.

[0023] Wherein: 1—connector nozzle; 10—core pressure sensing cavity; 101—cavity step ring; 11—connector nozzle step ring; 2—pressure core; 3—conversion circuit board; 4—bracket; 40—bracket boss; 5—signal processing board; 6—primary housing; 60—bracket boss; 61—housing step ring; 7—power filter board; 8—secondary housing; 9—electrical connector. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0025] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0026] like Figure 1-4As shown: A high-performance, lightweight pressure sensor includes a connector 1, a pressure core 2, a conversion circuit board 3, a bracket 4, a signal processing board 5, a primary housing 6, a power filter board 7, a secondary housing 8, and an electrical connector 9. The primary housing 6 and the secondary housing 8 are made of stainless steel. The pressure core 2 is installed inside a pressure-sensing cavity 10 within the connector 1. The conversion circuit board 3 is mounted on the output side of the pressure core 2 via a pin structure. One end of the bracket 4 is fixed to the outer edge of the pressure-sensing cavity 10, and the other end is fitted with the signal processing board 5. The primary housing 6, which is fitted outside the bracket 4, is fixed at one end to the connector 1, and the other end is fitted with the power filter board 7 and used to connect to one end of the secondary housing 8. The other end of the secondary housing 8 is fitted with the electrical connector 9. In terms of signal transmission, the conversion circuit board 3 is connected to the signal processing board 5 via a line, the signal processing board 5 is connected to the power filter board 7 via a line, and the power filter board 7 is connected to the electrical connector 9 via a line. The pressure signal collected by the pressure sensor reaches the pressure-sensing diaphragm of the pressure core 2 through the connector 1. The pressure-sensing diaphragm transmits the signal to the pressure-sensing chip and generates an electrical signal. The electrical signal output by the pressure core 2 reaches the conversion circuit board 3 and is converted into a millivolt-level voltage signal or a milliampere-level current signal. The signal processing board 5 converts the millivolt-level voltage signal or milliampere-level current signal output by the conversion circuit board 3 into a voltage signal or current signal that meets the requirements, and then transmits it to the power filter board 7 through a wire. The power filter board 7 compensates and amplifies the voltage signal or current signal, and outputs a voltage signal or current signal that meets the accuracy requirements through the electrical connector 9.

[0027] In the sensor with the above structure, specifically regarding the connection structure of the components, a stepped ring 11 for positioning and installing a primary housing 6 is arranged on the outer periphery of the connector 1. One end of the primary housing 6 is embedded outside the stepped ring 11 and the two are welded together. The primary housing 6 is fitted outside the core pressure-sensing cavity 10, and there is a gap between the inner wall of the primary housing 6 and the outer wall of the core pressure-sensing cavity 10. A stepped ring 101 for positioning and installing a bracket 4 is arranged on the outer periphery of the core pressure-sensing cavity 10. One end of the bracket 4 is embedded outside the stepped ring 101 and the two are welded together. Several bracket protrusions 40 are arranged on one end of the inner wall of the bracket 4, and the signal processing board 5 is fixedly installed on the bracket protrusions 40. A stepped ring 61 for positioning and installing a secondary housing 8 is arranged on the outer periphery of the primary housing 6. One end of the secondary housing 8 is embedded outside the stepped ring 61 and the two are welded together. Several housing protrusions 60 are arranged on one end of the inner wall of the primary housing 6, and the power filter board 7 is fixedly installed on the housing protrusions 60. Example

[0028] like Figure 1-4The high-performance, lightweight pressure sensor shown includes a connector 1, a pressure core 2, a conversion circuit board 3, a bracket 4, a signal processing board 5, a primary housing 6, a power filter board 7, a secondary housing 8, and an electrical connector 9. Inside the connector 1 are a pressure-sensing cavity 10 and a pressure core 2 for measuring pressure values. The pressure core 2 is installed inside the pressure-sensing cavity 20. The conversion circuit board 3 is mounted on the pressure core 2 via pins. The pressure signal is transmitted to the pressure-sensing diaphragm of the pressure core 2 and then transmitted out through the conversion circuit board 3. The bracket 4 is soldered to the pressure-sensing cavity 10. The signal processing board 5 is mounted on the bracket boss 40 on the bracket 4 via screws on the connector step ring 101. The signal processing board 5 transmits data from the conversion circuit board 3 to the power filter board 7 via wires. The primary housing 6 is directly soldered to the connector step ring 11 on the outer periphery of the connector 1. The power filter board 7 is mounted on the bracket boss 60 of the primary housing 6 via screws. The power filter board 7 transmits data from the signal processing board 5 to the electrical connector 9 via wires. One end of the secondary housing 8 is soldered to the housing step ring 61 of the primary housing 6, and the other end is soldered to the electrical connector 9.

[0029] The working process of the high-performance lightweight pressure sensor provided in this embodiment is as follows: The pressure signal collected by the pressure sensor reaches the pressure-sensing diaphragm of the pressure core 2 through the connector 1. The pressure-sensing diaphragm transmits the signal to the pressure-sensing chip and generates an electrical signal. The electrical signal is transmitted to the pin of the sintered base through the gold wire, and then transmitted out of the pressure core 3 and to the conversion circuit board 3. The signal processing board 5 converts the millivolt-level voltage signal or milliampere-level current signal output by the conversion circuit board 3 into a voltage signal or current signal that meets the requirements. Then, it is transmitted to the power filter board 7 through the wire. The power filter board 7 compensates and amplifies the voltage signal or current signal, and outputs a voltage signal or current signal that meets the accuracy requirements through the electrical connector 9.

[0030] The high-performance, lightweight pressure sensor provided by this invention, when applied to aircraft engines, can monitor the internal pressure of the aircraft engine, accurately measure parameters such as intake pressure, combustion pressure, and exhaust pressure in real time, and promptly understand the engine's operating status, optimize its performance, and ensure flight safety.

[0031] The high-performance, lightweight pressure sensor provided by this invention is installed on the brake control valve in the brake subsystem of a large cargo drone braking system. It is used to sense the brake pressure and provide feedback analog signals to the brake unit, thereby completing closed-loop control. The analog signal from the pressure sensor is amplified and converted into a digital signal in the brake control monitoring unit.

[0032] The sensor of this invention effectively controls the spacing between adjacent circuit boards by mounting the conversion circuit board 3, signal processing board 5, and power filter board 7 on different components, thereby avoiding electromagnetic interference between adjacent circuit boards and reducing electromagnetic interference inside the sensor, thus improving the product's accuracy to over 0.2%. The sensor adopts a stainless steel fully sealed shell design, which is lightweight and has strong overall sealing, effectively shielding electromagnetic interference inside and outside the sensor, thereby ensuring the stability of product performance.

[0033] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0035] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0036] The above embodiments are only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the scope of protection of this utility model. Technologies not covered by this utility model can be implemented by existing technologies.

Claims

1. A high performance light weight pressure sensor characterized by: The sensor comprises a connecting nozzle (1), a pressure core (2), a conversion circuit board (3), a support (4), a signal processing board (5), a primary shell (6), a power filter board (7), a secondary shell (8) and an electric connector (9).

2. The high performance light weight pressure sensor of claim 1, wherein: The conversion circuit board (3) is connected with the signal processing board (5) through a circuit, the signal processing board (5) is connected with the power filter board (7) through a circuit, and the power filter board (7) is connected with the electric connector (9) through a circuit; the pressure signal collected by the pressure sensor reaches the pressure sensing diaphragm of the pressure core (2) through the connecting nozzle (1), the pressure sensing diaphragm transmits the signal to the pressure sensing chip and generates an electric signal, the electric signal output by the pressure core (2) reaches the conversion circuit board (3) and is converted into a millivolt-level voltage signal or a milliampere-level current signal, the signal processing board (5) converts the millivolt-level voltage signal or the milliampere-level current signal output by the conversion circuit board (3) into a voltage signal or a current signal meeting the requirements, and then transmits the voltage signal or the current signal to the power filter board (7) through a wire, the power filter board (7) compensates and amplifies the voltage signal or the current signal, and outputs the voltage signal or the current signal meeting the accuracy requirements through the electric connector (9).

3. The high performance light weight pressure sensor of claim 1, wherein: The outer periphery of the connecting nozzle (1) is provided with a connecting nozzle step ring (11) for positioning and mounting the primary shell (6), and one end of the primary shell (6) is embedded outside the connecting nozzle step ring (11) and is welded and fixed.

4. The high performance light weight pressure sensor according to claim 1 or 3, characterized in that: The primary shell (6) is sleeved outside the pressure core cavity (10), and a gap is formed between the inner wall of the primary shell (6) and the outer wall of the pressure core cavity (10).

5. The high performance light weight pressure sensor of claim 1, wherein: The outer periphery of the connecting nozzle (1) is provided with a connecting nozzle step ring (11) for positioning and mounting the primary shell (6), and one end of the primary shell (6) is embedded outside the connecting nozzle step ring (11) and is welded and fixed.

6. The high performance light weight pressure sensor according to claim 1 or 5, characterized in that: The inner wall of the support (4) is provided with a plurality of support bosses (40), and the signal processing board (5) is fixedly mounted on the support bosses (40).

7. The high performance light weight pressure sensor of claim 1, wherein: The outer periphery of the connecting nozzle (1) is provided with a connecting nozzle step ring (11) for positioning and mounting the primary shell (6), and one end of the primary shell (6) is embedded outside the connecting nozzle step ring (11) and is welded and fixed.

8. The high performance light weight pressure sensor according to claim 1 or 7, characterized in that: The inner wall of the primary shell (6) is provided with a plurality of shell bosses (60), and the power filter board (7) is fixedly mounted on the shell bosses (60).

9. The high performance light weight pressure sensor of claim 1, wherein: The primary shell (6) and the secondary shell (8) are made of stainless steel.

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