CN219064753U

CN219064753U - Redundant pressure sensor

Info

Publication number: CN219064753U
Application number: CN202223507405.3U
Authority: CN
Inventors: 赵斌; 张钦河; 李华培
Original assignee: Wuhan Aviation Instrument Co Ltd
Current assignee: Wuhan Aviation Instrument Co Ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-05-23
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses a redundant pressure sensor. The device comprises a three-redundancy pressure sensitive component (1), a compensation circuit component (2), a shell (3), a cover plate (4), a socket (5) and a conductive sealing ring (6); the three-redundancy pressure sensitive assembly (1) is fixed on the side wall of the shell (3), the compensation circuit assembly (2) is fixed inside the shell (3), the cover plate (4) covers the top of the shell (3) to seal the compensation circuit assembly (2) in the shell (3), the socket (5) is also fixed on the side wall of the shell (3), and the matching surface of the cover plate (4) and the shell (3) and the matching surface of the socket (5) and the shell (3) are sealed by the conductive sealing ring (6). The utility model realizes three-redundancy measurement of pressure, and has small volume and light weight.

Description

Redundant pressure sensor

Technical Field

The utility model relates to the technical field of pressure measurement of an engine pipeline system, in particular to a redundant pressure sensor.

Background

In pressure sensor applications, high reliability measurements of the sensor are increasingly required. Redundancy design is an important content of reliability technology, and is an important implementation way for improving reliability when the scale of a system cannot be enlarged.

Pressure sensors are typically composed of a pressure sensing component, a circuit conditioning component, an electrical interface, and a support protection structure.

In the existing sensor design scheme, most of the pressure sensing component and the circuit conditioning component are designed in single redundancy, and the sensor function is disabled when one part of the pressure sensing component or the circuit conditioning component fails; after the existing pressure sensor is connected with the system, if the pressure measured value in the system is abnormal, the pressure sensor fault or the system fault cannot be judged.

Disclosure of Invention

The purpose of the utility model is that: a redundant pressure sensor is provided. The utility model realizes three-redundancy measurement of pressure, and has small volume and light weight.

The technical scheme of the utility model is as follows: a redundant pressure sensor comprises a three-redundancy pressure sensitive component, a compensation circuit component, a shell, a cover plate, a socket and a conductive sealing ring; the three-redundancy pressure sensitive component is fixed on the side wall of the shell, the compensation circuit component is fixed inside the shell, the cover plate covers the top of the shell to seal the compensation circuit component in the shell, the socket is also fixed on the side wall of the shell, and the matching surface of the cover plate and the shell and the matching surface of the socket and the shell are sealed by the conductive sealing ring.

In the redundant pressure sensor, the three-redundancy pressure sensitive component is of a single redundancy structure of a mechanical interface and a three redundancy structure of a sensitive circuit; meanwhile, the three-redundancy pressure sensitive assembly adopts a pressure chip oil filling isolation structure, and three mutually independent pressure sensitive chips are integrated on the same substrate and are used for simultaneously measuring three pressure signals and outputting three millivolt-level voltage signals which linearly change along with the pressure; the three-redundancy pressure sensitive component is connected with a pressure measurement pipeline in the system through a mechanical interface, and outputs an electric signal corresponding to the pressure in the three pipelines.

In the foregoing redundant pressure sensor, the compensation circuit component is three independent electrical signal compensation circuits, and each electrical signal compensation circuit correspondingly calculates and compensates a channel pressure signal in the three-redundancy pressure sensitive component.

In the redundant pressure sensor, each electric signal compensation circuit consists of a power supply module and a signal conditioning module; the power module performs reverse connection protection, filtering and secondary power conversion on a +/-15V power supply provided outside; the power module adopts an LM117 three-terminal adjustable output voltage stabilizer to convert an external power supply which is subjected to anti-reverse protection and filtering into a +5V secondary power supply used by the rear-end signal conditioning module, and provides stable power supply for the rear-end signal conditioning module; the signal conditioning module selects a WY47360 signal conditioning chip to perform signal conditioning and temperature compensation on millivolt-level voltage signals corresponding to pressure output by the three-redundancy pressure sensitive component, outputs voltage signals of 0-10 VDC, and transmits the signals to a system through a socket for signal acquisition.

In the redundant pressure sensor, the shell and the cover plate play roles in supporting, protecting and sealing the three-redundancy pressure sensitive component, the compensation circuit component and the socket, and stainless steel 1Cr18Ni9Ti is selected as a material.

In the redundant pressure sensor, the external dimension of the redundant pressure sensor is 75mm multiplied by 66mm multiplied by 28.5mm, and the product weight is 320g.

The utility model has the advantages that: compared with the prior art, the pressure sensing component and the circuit are designed into a three-redundancy structure in a resolving way, so that the miniaturized design with small volume and light weight is realized; the pressure measurement accuracy is high.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

FIG. 2 is a schematic diagram of a three-redundancy pressure sensitive assembly of the present utility model.

Fig. 3 is a functional block diagram of the present utility model.

Fig. 4 is an outline dimension of the present utility model. Wherein the mechanical interface adopts M12X 1-6h threads plus a 74 DEG conical sealing structure, and the external dimension is 75mm multiplied by 66mm multiplied by 28.5mm.

Detailed Description

The utility model is further illustrated by the following figures and examples, which are not intended to be limiting.

Example 1. A redundant pressure sensor is formed as shown in figures 1-4 and comprises a three-redundancy pressure sensitive component 1, a compensation circuit component 2, a shell 3, a cover plate 4, a socket 5 and a conductive sealing ring 6. The three-redundancy pressure sensitive assembly 1 is connected with the shell 3 through a cylindrical head screw of M3, the compensation circuit assembly 2 is fixedly connected with the shell 3 through a screw of M2, the cover plate 4 and the socket 5 are connected with the shell 3 through a screw connection mode, and the matching surface of the cover plate 4 and the shell 3 and the matching surface of the socket 5 and the shell 3 are sealed by a conductive sealing ring 6; specifically, the three-redundancy pressure sensitive component 1 is fixed on the side wall of the shell 3, the compensation circuit component 2 is fixed inside the shell 3, the cover plate 4 covers the top of the shell 3 to seal the compensation circuit component 2 in the shell 3, the socket 5 is also fixed on the side wall of the shell 3, and the matching surface of the cover plate 4 and the shell 3 and the matching surface of the socket 5 and the shell 3 are sealed by the conductive sealing ring 6.

The three-redundancy pressure sensitive component 1 is single redundancy of a mechanical interface and three redundancy of a sensitive circuit, adopts a pressure chip oil filling isolation structure, integrates three mutually independent pressure sensitive chips on the same substrate, can simultaneously measure three pressure signals, and outputs three millivolt-level voltage signals which linearly change along with the pressure. The three-redundancy pressure sensitive component is connected with a pressure measurement pipeline in the system through a mechanical interface, and outputs an electric signal corresponding to the pressure in the three pipelines.

The compensation circuit assembly 2 is a three-way electric signal compensation circuit which is mutually independent, the compensation circuit assembly is divided into 3 circuit assemblies, each circuit assembly corresponds to the solution and compensation of the pressure signal of one channel in the pressure sensitive assembly 1, the 3 circuit assemblies work independently and do not affect each other, and the pressure measurement can be normally carried out on any channel circuit assembly or other two channels of the pressure sensitive assembly. Each redundancy circuit design of the compensation circuit assembly 2 is composed of a power supply module and a signal conditioning module. The power module performs reverse connection protection, filtering and secondary power conversion on an externally provided +/-15V power supply, and an LM117 three-terminal adjustable output voltage stabilizer is adopted to convert the external power supply subjected to reverse connection protection and filtering into a +5V secondary power supply used by the rear-end signal conditioning module, so that stable power supply is provided for the rear-end signal conditioning module. The signal conditioning module selects WY47360 signal conditioning chip to perform signal conditioning and temperature compensation on millivolt-level voltage signals corresponding to pressure output by the pressure sensitive component 1, outputs voltage signals of (0-10) VDC, and transmits the signals to a system through the socket 5 for signal acquisition. Three millivolt voltage signals output by the three-redundancy pressure sensitive component 1 can be subjected to signal conditioning and temperature compensation by the compensation circuit component 2, and then pressure measurement can be carried out within the range of-55-125 ℃ to achieve high-precision measurement of 0.5% FS in the full temperature area.

The shell 3 and the cover plate 4 play roles in supporting protection and sealing protection on the three-redundancy pressure sensitive component 1, the compensation circuit component 2 and the socket 5, stainless steel 1Cr18Ni9Ti is selected as a material, and the strength and corrosion resistance of the whole product are ensured. The shell 3 and the cover plate 4 are compact in structural design, reasonable in layout, the stress part is thickened by adopting stainless steel materials, the gravity center of the product is fully lowered by controlling the height, and the gravity center of the product is controlled at the lug position.

The conductive sealing ring 6 is arranged on the matching surface of the cover plate 4 and the shell 3 and the matching surface of the connector and the shell, so that electromagnetic leakage can be reduced, and the electromagnetic compatibility protective performance of the product can be improved.

The external dimension of the redundant pressure sensor is 75mm multiplied by 66mm multiplied by 28.5mm, the product weight is 320g, and the small-size and light-weight miniaturized design is realized through the structural design of the shell and the compact layout of the sensor.

Example 2. Referring to fig. 1, the redundant pressure sensor of the present utility model includes a pressure sensing component with three redundancy, a circuit compensation component with three redundancy, a housing, a cover plate, and an electrical interface. The three-redundancy pressure sensing component can realize three-redundancy measurement on pressure at the same time, and three-redundancy and high-precision pressure measurement is realized through three paths of signal compensation circuits with mutually independent rear ends. By the structural design of the shell and the compact layout of the sensor, the miniaturized design of small volume and light weight of the sensor is realized.

Referring to fig. 2, the triple redundancy pressure sensor assembly 1 of the present utility model is composed of a triple redundancy pressure core and a filler neck, wherein the triple redundancy pressure core is welded in the filler neck by argon arc welding. The three-redundancy pressure core body is integrated with three independent pressure sensitive units on the same substrate, and can simultaneously measure three pressure signals and output millivolt-level voltage signals corresponding to the three pressure signals; the filler neck (mechanical interface) adopts M1X1-6 h external thread, with 74 degree external cone, through thread and 74 degree external cone to realize connection and sealing with system pipeline, there are 4M 3 screw mounting holes on it, install and fix the three redundancy pressure sensitive component 1 on the shell 3 of the utility model through the screw.

Referring to fig. 3, the utility model adopts the silicon piezoresistance principle to realize the measurement of pressure signals, adopts a three-redundancy pressure sensitive component, and simultaneously measures and outputs three pressure signals. Each pressure sensitive unit is provided with a corresponding compensation circuit, and the weak signals of the pressure sensitive units are compensated and conditioned to output (0-10) VDC standard voltage signals.

Claims

1. The redundant pressure sensor is characterized by comprising a three-redundancy pressure sensitive component (1), a compensation circuit component (2), a shell (3), a cover plate (4), a socket (5) and a conductive sealing ring (6); the three-redundancy pressure sensitive assembly (1) is fixed on the side wall of the shell (3), the compensation circuit assembly (2) is fixed inside the shell (3), the cover plate (4) covers the top of the shell (3) to seal the compensation circuit assembly (2) in the shell (3), the socket (5) is also fixed on the side wall of the shell (3), and the matching surface of the cover plate (4) and the shell (3) and the matching surface of the socket (5) and the shell (3) are sealed by the conductive sealing ring (6).

2. The redundant pressure sensor of claim 1, wherein the three-redundancy pressure sensitive component (1) is a mechanical interface single-redundancy, sensitive circuit three-redundancy structure; meanwhile, the three-redundancy pressure sensitive assembly (1) adopts a pressure chip oil filling isolation structure, and three mutually independent pressure sensitive chips are integrated on the same substrate and are used for simultaneously measuring three pressure signals and outputting three millivolt-level voltage signals which linearly change along with the pressure; the three-redundancy pressure sensitive component (1) is connected with a pressure measurement pipeline in the system through a mechanical interface, and outputs an electric signal corresponding to the pressure in the three pipelines.

3. A redundant pressure sensor according to claim 1, wherein the compensation circuit assembly (2) is a three-way electrical signal compensation circuit independent of each other, each of which is adapted to solve and compensate for a channel pressure signal in the three-redundancy pressure sensitive assembly (1).

4. A redundant pressure sensor according to claim 3, wherein each of said electrical signal compensation circuits is comprised of a power module and a signal conditioning module; the power module performs reverse connection protection, filtering and secondary power conversion on a +/-15V power supply provided outside; the power module adopts an LM117 three-terminal adjustable output voltage stabilizer to convert an external power supply which is subjected to anti-reverse protection and filtering into a +5V secondary power supply used by the rear-end signal conditioning module, and provides stable power supply for the rear-end signal conditioning module; the signal conditioning module selects WY47360 signal conditioning chip to perform signal conditioning and temperature compensation on millivolt-level voltage signals corresponding to pressure output by the three-redundancy pressure sensitive component (1), outputs voltage signals of 0-10 VDC, and transmits the signals to a system through a socket (5) for signal acquisition.

5. The redundant pressure sensor according to claim 1, wherein the housing (3) and the cover plate (4) play roles of supporting protection and sealing protection for the three-redundancy pressure sensitive component (1), the compensation circuit component (2) and the socket (5), and stainless steel 1Cr18Ni9Ti is selected as a material.

6. The redundant pressure sensor of claim 1, wherein the redundant pressure sensor has an outside dimension of 75mm x 66mm x 28.5mm and a product weight of 320g.