A redundant intelligent pressure sensor

Abstract

The present invention relates to the field of sensor technology, and more specifically, to a redundant intelligent pressure sensor, comprising: a pressure interface, wherein a shunt block is fixedly connected to the middle portion of the upper end of the pressure interface, and the front, rear, left, right, and upper end surfaces of the outer side of the shunt block are fixedly connected to a sintered base, wherein a mounting detection cavity is provided inside the sintered base, and a pressure chip and a corrugated diaphragm are provided inside the mounting detection cavity; and a signal processing circuit top plate, wherein four signal processing circuit side plates are connected to the outer side of the lower end of the signal processing circuit top plate in a circular array, and the signal processing circuit side plates are connected to the corresponding welding pins on the outer side of the sintered base. Through the overall structure of the device, the problem that the redundant pressure sensor must first encapsulate the pressure chip into a core and then encapsulate it is solved, and the number of internal channels can be configured according to the redundancy requirements, while making the redundant pressure sensor have intelligent functions, and the measurement results of each internal channel can be compared and judged.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a redundant intelligent pressure sensor. Background Art

[0002] Pressure sensors are widely used in aerospace, industrial control, automotive electronics, and other fields. MEMS (micromechanical systems)-based piezoresistive pressure chips offer high precision, low cost, and excellent stability. Piezoresistive pressure sensors, with their simple structure and high reliability, are well-suited for high-reliability aircraft applications. To further improve the safety and reliability of aircraft, multiple sensors of the same type are often installed in key locations. This not only serves as a backup, but also allows the output signals from multiple sensors to enter the system, enabling more accurate analysis and judgment of the measurement data.

[0003] In the existing technology, multiple single-redundancy sensors are installed in one location. Even if redundant sensors are installed, the pressure chip needs to be packaged into a pressure core first, and then the pressure core is packaged into a casing to be packaged into a sensor. For sensors with different redundancy, the casing must be made separately to meet the structural requirements of the packaging. This results in many packaging steps, poor product reliability, excessively large sensor size occupying valuable space on flight equipment, products that require custom design in most cases, and inability to flexibly solve the redundancy problem. Moreover, the sensor can only perform independent pressure measurement and signal output functions, cannot perform calculations by itself, and does not have analysis and judgment functions. Therefore, we propose a redundant intelligent pressure sensor. Summary of the Invention

[0004] The present application provides a redundant intelligent pressure sensor to solve the problems of existing pressure sensors, such as the many packaging steps, poor product reliability, large sensor size occupying valuable space on aircraft equipment, the product requiring custom design in most cases, the inability to flexibly solve the redundancy problem, and the sensor can only perform independent pressure measurement and signal output functions, cannot perform calculations on its own, and does not have the analysis and judgment functions.

[0005] or,

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a redundant intelligent pressure sensor, comprising:

[0007] A pressure interface, wherein a shunt block is fixedly connected to the middle of the upper end of the pressure interface, and the front, rear, left, right and upper end surfaces of the outer side of the shunt block are fixedly connected to a sintered base, and an installation detection cavity is opened inside the sintered base, and a pressure chip and a corrugated diaphragm are arranged inside the installation detection cavity;

[0008] A signal processing circuit top plate, wherein four signal processing circuit side plates are connected to the outer side of the lower end of the signal processing circuit top plate in a circular array, and the signal processing circuit side plates are connected to the welding feet on the outer sides of the corresponding sintered bases, and the signal processing circuit top plate is connected to the welding feet on the upper end of the sintered base.

[0009] Optionally, the upper outer portion of the pressure interface is nut-shaped, and a pressure channel is opened in the middle of the pressure interface.

[0010] Optionally, the diverter block is in a cube shape, and a staggered transmission channel is opened in the middle of the diverter block, and the lower end of the transmission channel is connected to the pressure channel, and the outer end of the transmission channel is respectively connected to the internal installation detection cavity of the corresponding sintered base.

[0011] Optionally, the outer upper portion of the pressure interface is connected to a shell through a threaded sealing sleeve, and the upper end of the shell is connected to a shell cap through a threaded connection.

[0012] Optionally, a cable is welded to the middle of the upper end of the signal processing circuit top plate, and the cable is sealed and plugged into the middle of the shell cap.

[0013] Optionally, a corrugated diaphragm is fixedly and sealedly welded on the inner side of the installation and detection cavity, and a pressure chip is provided on the inner wall of the installation and detection cavity. The pressure chip is connected to the corresponding inner welding feet of the sintered base, and pins are sealed and inserted on the outer side of the installation and detection cavity.

[0014] Optionally, the signal processing circuit top plate and the four signal processing circuit side plates are connected via wires.

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

[0016] Through the overall structure of the equipment, the pressure of the fluid enters the shunt block through the pressure channel of the pressure interface and is applied to each corrugated diaphragm respectively. The unnecessary pressure channel can block the corresponding channel opening on the shunt block. The corrugated diaphragm is elastically deformed under pressure to squeeze the silicone oil inside. The silicone oil transmits the pressure generated by the extrusion to the pressure chip, and the pressure chip does not need to be packaged. The pressure chip converts the pressure signal into an electrical signal, which is processed by the signal processing circuit side panel and transmitted to the signal processing circuit top panel. The signal processing circuit top panel solves the signal and analyzes and judges it, and outputs the calculation result through the cable, which solves the problem that the redundant pressure sensor must first package the pressure chip into a core body and then package it. The number of internal channels can be configured according to the redundancy needs, and the redundant pressure sensor has intelligent functions. The measurement results of each internal channel can be compared and judged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a cross-sectional view of the overall structure of an embodiment of the present invention.

[0019] Figure 2 It is a top cross-sectional view of an embodiment of the present invention.

[0020] Figure 3 This is a diagram of the internal structure of an embodiment of the present invention.

[0021] Figure 4 2 is a circuit diagram of an embodiment of the present invention.

[0022] Markings in the figure: 1. Pressure chip, 2. Sintered base, 3. Corrugated diaphragm, 4. Pin, 5. Signal processing circuit side plate, 6. Signal processing circuit top plate, 7. Cable, 8. Shell cap, 9. Shunt block, 10. Housing, 11. Pressure interface. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] It should be noted that all directional indications such as up, down, left, right, front, back, etc. in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0025] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] In the existing technology, multiple single-redundancy sensors are installed in one location. Even if multiple redundant sensors are installed, the pressure chip needs to be packaged into a pressure core first, and then the pressure core needs to be packaged into a casing to be packaged into a sensor. For sensors with different redundancy, the casing must be made separately to meet the structural requirements of the packaging.

[0028] In order to solve the above problems, the present invention proposes a redundant intelligent pressure sensor to solve the problems of the existing pressure sensor caused by many packaging steps, poor product reliability, excessive sensor size occupying valuable space on the flight equipment, the product in most cases requiring custom design, and the inability to flexibly solve the redundancy problem. Moreover, the sensor can only perform independent pressure measurement and signal output functions, cannot perform calculations by itself, and does not have the analysis and judgment functions.

[0029] like Figures 1 to 4 As shown, this embodiment provides a redundant intelligent pressure sensor, including:

[0030] A pressure interface 11, wherein a shunt block 9 is fixedly connected to the middle portion of the upper end of the pressure interface 11, and a sintered base 2 is fixedly connected to the front, rear, left, right, and upper end surfaces of the outer side of the shunt block 9. The sintered base 2 has an installation detection cavity formed inside, and a pressure chip 1 and a corrugated diaphragm 3 are provided inside the installation detection cavity;

[0031] The signal processing circuit top plate 6 has four signal processing circuit side plates 5 connected to it in a circular array on the outer side of the lower end of the signal processing circuit top plate 6, and the signal processing circuit side plates 5 are connected to the welding feet on the outer sides of the corresponding sintered bases 2, and the signal processing circuit top plate 6 is connected to the welding feet on the upper end of the sintered base 2.

[0032] Specifically, the pressure chip 1 can be installed without packaging, and the pressure interface 11 is welded to the lower side of the shell 10, and the upper end is connected to the shell cap 8 by threading. The middle of the shell cap 8 is sealed and plugged into the cable 7, so that the internal cavity of the sensor is sealed;

[0033] The sensor contains up to 5 pressure chips 1. One side of each pressure chip 1 is bonded to the inner side wall of the installation detection cavity of the pressure sintered base 2. The sintered base 2 is made of stainless steel material through glass sintered Kovar alloy pins. The other side of the pressure chip 1 is connected to the pin on the sintered base 2 through gold wire.

[0034] The sintered base 2 , the corrugated diaphragm 3 and the shunt block 9 are all connected by welding, and a detection cavity is installed inside the sintered base 2 and filled with stable silicone oil and then sealed by a welding pin 4 .

[0035] The shunt block 9 is welded to the pressure interface 11. The pressure of the fluid enters the shunt block through the pressure channel of the pressure interface 11 and is applied to each corrugated diaphragm 3 respectively. The unnecessary pressure channel can block the corresponding channel opening on the shunt block. The corrugated diaphragm 3 is elastically deformed under pressure to squeeze the silicone oil inside. The silicone oil transmits the pressure generated by the extrusion to the pressure chip 1. The pressure chip 1 converts the pressure signal into an electrical signal. The electrical signal is processed by the signal processing circuit side panel 5 and transmitted to the signal processing circuit top panel 6. The signal processing circuit top panel 6 solves the signal and analyzes and judges it, and outputs the calculation result through the cable 7.

[0036] In this embodiment, if Figure 1 As shown, the upper outer portion of the pressure interface 11 is nut-shaped, and a pressure channel is opened in the middle of the pressure interface 11.

[0037] Specifically, the pressure interface 11 is for fluid to enter and thus enter the interior of the transmission channel.

[0038] In this embodiment, if Figure 1 As shown: the diverter block 9 is in a cube shape, and a staggered transmission channel is opened in the middle of the diverter block 9, and the lower end of the transmission channel is connected to the pressure channel, and the outer end of the transmission channel is respectively connected to the internal installation detection cavity of the corresponding sintered base 2.

[0039] Specifically, after the detected fluid enters the transmission channel, it exerts a squeezing force on the corrugated diaphragm 3 .

[0040] In this embodiment, if Figure 1 As shown, the outer upper portion of the pressure interface 11 is connected to the housing 10 through a threaded sealing sleeve, and the upper end of the housing 10 is connected to the housing cap 8 through a threaded connection.

[0041] Specifically, the outer shell 10 plays a protective role, and the connection between the shell cap 8 and the outer shell 10 is in a sealed state.

[0042] In this embodiment, if Figure 1 As shown: a cable 7 is welded to the middle of the upper end of the signal processing circuit top plate 6, and the cable 7 is sealed and plugged into the middle of the shell cap 8.

[0043] Specifically, the cable 7 is used to transmit the signal detected by the sensor.

[0044] In this embodiment, if Figure 1 and Figure 2 As shown: the inner side surface of the installation and detection cavity is fixedly and sealedly welded with a corrugated diaphragm 3, the inner wall of the installation and detection cavity is provided with a pressure chip 1, the pressure chip 1 is connected to the corresponding inner side welding foot of the sintered base 2, and the outer side of the installation and detection cavity is sealed and plugged with pins 4.

[0045] Specifically, a detection cavity is installed inside the sintered base 2 and filled with stable silicone oil and then sealed by welding the pin 4 .

[0046] In this embodiment, if Figure 1 and 3 As shown: the signal processing circuit top plate 6 and the four signal processing circuit side plates 5 are connected via wires.

[0047] Specifically: the pressure chip 1 converts the pressure signal into an electrical signal, which is processed by the signal processing circuit side panel 5 and transmitted to the signal processing circuit top panel 6. The signal processing circuit top panel 6 solves the signal, analyzes and judges it, and outputs the calculation result through the cable 7.

[0048] When the pressure sensor measures pressure, the measured medium passes through the medium inlet on the pressure interface 11 and acts on the corrugated diaphragm 3 in the sensor core, squeezing the corrugated diaphragm 3. The corrugated diaphragm 3 then transmits the squeezing force to the pressure chip 1 through the silicone oil inside the detection cavity. That is, after silicone oil is injected into the detection cavity, it is sealed by the pin 4. After the internal silicone oil is squeezed by the corrugated diaphragm 3, the squeezing force is transmitted to the pressure chip 1. The pressure chip 1 uses the piezoresistive effect to convert the sensed pressure into a change in resistance. Its equivalent circuit is as follows: Figure 4As shown, the pressure chip 1 integrates four piezoresistors to form a Wheatstone bridge. When pressure is applied, the resistance values of R1 and R3 increase, and the resistance values of R2 and R4 decrease. The external power supply supplies power to the sensor through the shielded cable 7. The voltage conversion chip converts the external voltage into a stable reference voltage signal (+5V power supply voltage) and provides it to the temperature compensation conditioning chip, which is then provided to the pressure chip 1 through the internal excitation voltage Vs of the temperature compensation conditioning chip. When the pressure changes, the output signal V0 of the pressure chip 1 is fed back to the temperature compensation conditioning chip, and the temperature compensation conditioning chip then transmits the compensated output signal to the external circuit through the shielded cable 7. The output signal of the external cable is monitored to complete the pressure measurement function. The voltage conversion chip and the temperature compensation conditioning chip are respectively welded on the signal processing circuit top plate 6 and the signal processing circuit side plate 5.

[0049] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A redundant intelligent pressure sensor, characterized in that: include: A pressure interface (11), wherein a diverter block (9) is fixedly connected to the middle portion of the upper end of the pressure interface (11), and the front, rear, left, right, and upper end surfaces of the outer side of the diverter block (9) are fixedly connected to a sintered base (2), wherein an installation detection cavity is provided inside the sintered base (2), and a pressure chip (1) and a corrugated diaphragm (3) are provided inside the installation detection cavity; A signal processing circuit top plate (6), wherein the outer side of the lower end of the signal processing circuit top plate (6) is connected to four signal processing circuit side plates (5) in a ring array, and the signal processing circuit side plates (5) are connected to the welding pins on the outer sides of the corresponding sintered bases (2), and the signal processing circuit top plate (6) is connected to the welding pins on the upper end of the sintered base (2); The diverter block (9) is in a cube shape, and a staggered transmission channel is opened in the middle of the diverter block (9), and the lower end of the transmission channel is connected to the pressure channel, and the outer end of the transmission channel is respectively connected to the internal installation detection cavity of the corresponding sintered base (2); The inner side surface of the installation detection cavity is fixedly and sealedly welded with a corrugated diaphragm (3), the inner side wall of the installation detection cavity is provided with a pressure chip (1), the pressure chip (1) is connected to the inner side welding foot of the corresponding sintered base (2), and the outer side of the installation detection cavity is sealed and plugged with a pin (4).

2. The redundant intelligent pressure sensor according to claim 1, characterized in that: The upper outer portion of the pressure interface (11) is nut-shaped, and a pressure channel is opened in the middle of the pressure interface (11).

3. The redundant intelligent pressure sensor according to claim 1, characterized in that: The outer upper portion of the pressure interface (11) is connected to the outer shell (10) through a threaded sealing sleeve, and the upper end of the outer shell (10) is connected to the shell cap (8) through a threaded connection.

4. The redundant intelligent pressure sensor according to claim 1, characterized in that: A cable (7) is welded to the middle of the upper end of the signal processing circuit top plate (6), and the cable (7) is sealed and plugged into the middle of the shell cap (8).

5. The redundant intelligent pressure sensor according to claim 1, characterized in that: The signal processing circuit top plate (6) and the four signal processing circuit side plates (5) are connected via wires.

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