Aero short cantilever temperature and pressure sensor for fire bottle

Abstract

This invention discloses a short-cantilever thermo-pressure composite sensor for aviation fire extinguishing bottles. It includes a housing (7), within which two supports (2) are arranged axially. A power processing printed circuit board component (3) and a signal processing printed circuit board component (4) are respectively located between the two supports (2). The support (2) near the end of the housing (7) is also connected to the head end of a thermo-pressure composite core (1), the end of which extends axially from the end of the housing (7). The thermo-pressure composite core (1) is used to collect temperature and pressure signals inside the fire extinguishing bottle. This invention significantly improves the reliability and safety of aviation fire extinguishing bottles.

Description

Technical Field

[0001] This invention relates to the field of sensor structure technology, specifically to an aviation fire extinguisher bottle probe-type short cantilever thermo-baric composite sensor. Background Technology

[0002] Currently, the sensors used on aviation fire extinguishing bottles are mechanical pressure gauges, requiring manual data reading and only capable of measuring pressure. As the importance of intelligent sensors in aviation applications increases, higher demands are being placed on the intelligence and safety of temperature-pressure composite sensors for aviation fire extinguishing bottles. To address this, a probe-type short cantilever temperature-pressure composite sensor (capable of simultaneously outputting temperature and pressure signals) is adopted. This enables the intelligent design of the temperature-pressure composite sensor structure for aviation fire extinguishing bottles, significantly improving the reliability and safety of the devices due to the probe-type short cantilever structure. Summary of the Invention

[0003] The purpose of this invention is to provide a short-cantilever thermo-barometric composite sensor for use with aviation fire extinguishers. This invention significantly improves the reliability and safety of aviation fire extinguishers.

[0004] The technical solution of the present invention is: an aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor, including a housing, two supports arranged axially inside the housing, a power processing printed circuit board component and a signal processing printed circuit board component respectively provided between the two supports, and the support near the end of the housing is also connected to the head end of the temperature and pressure composite core, the end of the temperature and pressure composite core extending out of the end of the housing axially; the temperature and pressure composite core is used to collect temperature and pressure signals inside the fire extinguisher bottle.

[0005] In the aforementioned aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor, pressure-sensing holes are distributed on the end face of the end of the temperature and pressure composite core, and a pressure-sensing cavity is provided inside the temperature and pressure composite core, with the pressure-sensing holes and the pressure-sensing cavity connected.

[0006] In the aforementioned aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor, there are three pressure-sensing holes arranged in a triangular pattern, and each pressure-sensing hole has a diameter of 1 mm.

[0007] In the aforementioned aviation fire extinguisher bottle probe-type short cantilever thermo-pressure composite sensor, the thermo-pressure composite core has a columnar structure, and a limiting step is provided on the columnar surface. After the thermo-pressure composite core extends into the housing, the end face of the housing abuts against the limiting step to complete the limiting.

[0008] In the aforementioned aviation fire extinguisher bottle-type short cantilever thermo-pressure composite sensor, the distance between the end face of the thermo-pressure composite core and the limiting step and the abutment surface of the shell is 12.5mm.

[0009] In the aforementioned aviation fire extinguisher bottle-type short cantilever thermo-pressure composite sensor, the end face of the thermo-pressure composite core is provided with a stepped groove; the end face of the bracket near the thermo-pressure composite core is provided with a boss; the stepped groove and the boss are engaged.

[0010] In the aforementioned aviation fire extinguisher bottle-type short cantilever thermo-pressure composite sensor, two sets of connecting components are distributed on the end face of the bracket away from the thermo-pressure composite core. Each set of connecting components consists of a pair of pillars with screw holes. The power processing printed circuit board component and the signal processing printed circuit board component are fixed to the corresponding connecting components at both ends by fasteners and insulating gaskets.

[0011] In the aforementioned aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor, the housing is divided into a threaded section and an immersion section along the axial direction; the threaded section is near the head end of the housing and is used to install the entire sensor inside the fire extinguisher bottle; the immersion section is immersed in the fire extinguisher bottle liquid.

[0012] In the aforementioned aviation fire extinguisher bottle-type short cantilever thermo-barometric composite sensor, the length of the immersion section is 48mm to 57mm, and the diameter is 18 to 22mm.

[0013] In the aforementioned aviation fire extinguisher bottle probe-type short cantilever thermo-pressure composite sensor, the signal processing printed circuit board component is used to convert the voltage signal representing pressure and temperature collected by the thermo-pressure composite core into a 4mA to 20mA current signal.

[0014] The advantages of this invention are: This invention is for a probe-type short cantilever temperature and pressure composite sensor for aviation fire extinguishing bottles. It adopts a probe-type short cantilever structure, which enables the temperature and pressure composite sensor to withstand the vibration value transmitted and amplified by the bottle body, and can accurately and quickly output the temperature and pressure signals inside the bottle. This improves the overall vibration resistance of the fire extinguishing bottle and the accuracy and efficiency of performance testing, thereby greatly improving the reliability and safety of aviation fire extinguishing bottles.

[0015] The proposed invention relates to an aviation fire extinguisher bottle probe-type short cantilever thermo-pressure composite sensor, designed based on the reliability of fire extinguishers and intelligent temperature and pressure measurement. To this end, a probe-type short cantilever thermo-pressure composite sensor (capable of simultaneously outputting temperature and pressure signals) is employed. The spatial arrangement of the power processing printed circuit board (PCB) and signal processing PCB components is optimized, with a design width of 42mm and a vibration amplitude of approximately 33g–37g. This allows the aviation fire extinguisher bottle thermo-pressure composite sensor structure to meet intelligent design requirements, significantly improving the reliability and safety of aviation fire extinguishers due to the probe-type short cantilever structure. Attached Figure Description

[0016] Figure 1 This invention relates to an aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor;

[0017] Figure 2 This is a schematic diagram of the structure of the temperature-pressure composite core of the present invention;

[0018] Figure 3 This is a schematic diagram of the structure of the bracket of the present invention;

[0019] Figure 4 This is a schematic diagram of the power processing printed circuit board component and the signal processing printed circuit board component of the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the housing of the present invention;

[0021] Figure 6 This is a schematic diagram of the structural strength simulation of the present invention.

[0022] Reference numerals in the attached figures: 1-Temperature-pressure composite core, 11-Pressure sensing hole, 12-Pressure sensing cavity, 13-Limiting step, 14-Step groove, 2-Bracket, 21-Boss, 22-Screw hole, 23-Support, 3-Power processing printed circuit board component, 4-Signal processing printed circuit board component, 5-Insulating gasket, 6-Fastener, 7-Housing, 71-Threaded section, 72-Immersion section. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0024] Example 1. A short cantilever thermo-barometric composite sensor for use in aviation fire extinguishing bottles, configured as follows: Figure 1-6 As shown: A stepped groove 14 is provided on the end face of the thermo-pressure composite core 1; a boss 21 is provided on the end face of the bracket 2 near the thermo-pressure composite core 1; the stepped groove 14 and the boss 21 are engaged and fixed by welding; the power processing printed circuit board component 3 and the signal processing printed circuit board component 4 are fixed to the bracket 2 by four fasteners 6 and four insulating gaskets 5, and the other end of the power processing printed circuit board component 3 and the signal processing printed circuit board component 4 are fixed to the bracket 2 by four fasteners 6 and two insulating gaskets. The thermo-pressure composite core 1, the power processing printed circuit board component 3, the signal processing printed circuit board component 4 and the bracket 2 are fixed in the housing 7. The thermo-pressure composite core 1 has a columnar structure, and a limiting step 13 is provided on the columnar surface. After the thermo-pressure composite core 1 extends into the housing 7, the end face of the housing 7 abuts against the limiting step 13 to complete the limiting, and is fixed by welding.

[0025] like Figure 2 As shown, the temperature-pressure composite core 1 is a pressure and temperature sensitive element. Its main function is to sense the temperature and pressure signals of the liquid inside the fire extinguisher bottle and transmit the pressure signal to the signal processing printed circuit board component 4.

[0026] like Figure 3As shown, the bracket 2 uses four fasteners 6 to fix the power processing printed circuit board component 3 and the signal processing printed circuit board component 4 to the bracket 2 by screws passing through threaded holes; and is fixed to the thermo-pressure composite core 1 by welding the bracket with steps.

[0027] like Figure 4 As shown, the signal processing printed circuit board component 4 converts the mV voltage signal output by the temperature-pressure composite core 1, which senses pressure and temperature signals, into a 4mA~20mA current signal, and fixes it to the bracket 2 with screws.

[0028] Figure 5 As shown, the shell 7 adopts a short cantilever, protruding structure and is welded and fixed to the thermo-pressure composite core 1.

[0029] The aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor described in this invention is based on the reliability of the fire extinguisher bottle and its intelligent design for temperature and pressure. Therefore, the probe-type short cantilever temperature and pressure composite sensor can simultaneously output temperature and pressure signals, enabling the intelligent design requirements of the aviation fire extinguisher bottle temperature and pressure composite sensor structure. The probe-type short cantilever structure significantly improves the reliability and safety of aviation fire extinguishers.

[0030] Example 2. An aviation-grade fire extinguisher bottle-penetrating short cantilever thermo-barometric composite sensor, configured as follows: Figure 1-6 As shown: The device includes a housing 7, within which two supports 2 are axially arranged. Between the two supports 2 are a power processing printed circuit board component 3 and a signal processing printed circuit board component 4, respectively. The support 2 near the end of the housing 7 is also connected to the head end of a temperature-pressure composite core 1, the end of which extends axially from the end of the housing 7. The temperature-pressure composite core 1 is used to collect temperature and pressure signals from inside the fire extinguishing bottle. The working principle is as follows: the temperature-pressure composite core transmits the collected temperature and pressure signals to the signal processing printed circuit board component 4, which outputs a 4-20mA power processing printed circuit board component 3 via a V / I conversion circuit. After the power processing printed circuit board component 3 performs electromagnetic compatibility and power supply compatibility protection on the temperature and pressure signals output from the signal processing printed circuit board component 4, the signals are transmitted to the control system via an electrical connector. Separating the power processing printed circuit board component 3 and the signal processing printed circuit board component 4 results in higher space utilization (up to 61%) compared to a single component, and the separate design physically reduces the interference of the output voltage on the collected signal, making the collected signal more accurate.

[0031] Pressure-sensing holes 11 are distributed on the end face of the aforementioned thermo-pressure composite core 1. A pressure-sensing chamber 12 is provided inside the thermo-pressure composite core 1, and the pressure-sensing holes 11 and the pressure-sensing chamber 12 are connected. The pressure inside the fire extinguisher is transmitted to the pressure-sensing chamber 12 through the pressure-sensing holes 11, allowing the thermo-pressure composite core 1 to collect a pressure signal. The pressure-sensing holes 11 protect the diaphragm inside the pressure-sensing chamber 12, preventing the pressure from causing a large impact on the diaphragm.

[0032] There are three pressure-sensing holes 11, arranged in a triangular pattern, and each pressure-sensing hole 11 has a diameter of 1 mm. The three pressure-sensing holes 11 ensure that the pressure reaches the pressure-sensing chamber 12 normally, while also ensuring that the pressure does not cause a large impact on the diaphragm inside the pressure-sensing chamber 12.

[0033] The aforementioned thermo-pressure composite core 1 has a columnar structure, and a limiting step 13 is provided on the columnar surface. After the thermo-pressure composite core 1 extends into the housing 7, the end face of the housing 7 abuts against the limiting step 13 to complete the limiting.

[0034] The distance between the end face of the aforementioned thermo-pressure composite core 1 and the abutting surface of the limiting step 13 and the shell 7 is 12.5 mm.

[0035] The aforementioned temperature-pressure composite core 1 has a stepped groove 14 on its end face; the support 2 has a boss 21 on its end face near the temperature-pressure composite core 1; the stepped groove 14 and the boss 21 cooperate with each other. This fixes the internal power processing printed circuit board component 3 and signal processing printed circuit board component 4, increasing the circuit board's vibration resistance.

[0036] Two sets of connecting components are distributed on the end face of the aforementioned bracket 2 away from the thermo-pressure composite core 1. Each set of connecting components consists of a pair of pillars 23 with screw holes 22. The power processing printed circuit board component 3 and the signal processing printed circuit board component 4 are fixed to the corresponding connecting components at both ends by fasteners 6 and insulating pads 5.

[0037] The aforementioned housing 7 is axially divided into a threaded section 71 and an immersion section 72. The threaded section 71 is located near the head of the housing 7 and is used to install the entire sensor inside the fire extinguishing bottle. The immersion section 72 is immersed in the fire extinguishing bottle liquid. The immersion of the immersion section 72 in the fire extinguishing bottle liquid enables the thermo-pressure composite core 1 to fully and stably sense the temperature and pressure of the fire extinguishing bottle liquid, and then accurately transmits the sensed pressure and temperature signals to the signal processing printed circuit board component 4.

[0038] The aforementioned submerged section 72 has a length of 48mm–57mm and a diameter of 18–22mm. Through the analysis of… Figure 6 (a) Perform simulation analysis to obtain Figure 6 Simulation results (b). Figure 6(b) Analysis shows that when L = 43.5 to 46.5 mm, the vibration value suddenly changes from 45 g to about 116 g. Therefore, considering the spatial arrangement of the power processing printed circuit board component 3 and the signal processing printed circuit board component 4, a design of 42 mm is selected, with a vibration value of about 33 g to 37 g.

[0039] The aforementioned signal processing printed circuit board component 4 is used to convert the voltage signal representing pressure and temperature collected by the thermo-pressure composite core 1 into a 4mA to 20mA current signal. In long-distance signal transmission, the high resistance of the wires means that voltage transmission will result in a large error in the acquired signal due to the voltage drop caused by the resistance of the wires. However, the current signal does not change with the length of the wire, and the spark energy generated by the maximum current of 20mA is insufficient to ignite the gas, making it very safe.

Claims

1. A short cantilever thermo-barotropic composite sensor for use in aviation fire extinguishing bottles, characterized in that, The device includes a housing, inside which two supports are arranged axially. Between the two supports are power processing printed circuit board components and signal processing printed circuit board components, respectively. The support near the end of the housing is also connected to the head end of the thermo-pressure composite core, the end of which extends out of the housing along the axial direction. The thermo-pressure composite core is used to collect temperature and pressure signals inside the fire extinguishing bottle. Pressure-sensing holes are distributed on the end face of the thermo-pressure composite core, and a pressure-sensing cavity is provided inside the thermo-pressure composite core. The pressure-sensing holes and the pressure-sensing cavity are connected. There are 3 pressure-sensing holes arranged in a triangle, and each pressure-sensing hole has a diameter of 1mm; The thermo-pressed composite core has a columnar structure, and a limiting step is provided on the columnar surface. After the thermo-pressed composite core is inserted into the shell, the end face of the shell abuts against the limiting step to complete the limiting. The distance between the end face of the thermo-pressed composite core and the abutment surface of the limiting step and the shell is 12.5mm; The end face of the thermo-pressed composite core is provided with a stepped groove; the end face of the bracket near the thermo-pressed composite core is provided with a boss; the stepped groove and the boss are matched. The housing is divided into a threaded section and an immersion section along the axial direction; the threaded section is located near the head end of the housing and is used to install the entire sensor inside the fire extinguishing bottle; the immersion section is immersed in the fire extinguishing liquid. The length of the submerged section is 48mm to 57mm, and the diameter is 18mm to 22mm; The signal processing printed circuit board component is used to convert the voltage signal representing pressure and temperature collected by the thermo-pressure composite core into a 4mA to 20mA current signal.

2. The aviation fire extinguisher bottle probe-type short cantilever temperature and pressure composite sensor according to claim 1, characterized in that, Two sets of connecting components are distributed on the end face of the bracket away from the thermo-pressure composite core. Each set of connecting components consists of a pair of pillars with screw holes. The power processing printed circuit board component and the signal processing printed circuit board component are fixed to the corresponding connecting components at both ends by fasteners and insulating gaskets.

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