Ground water quantity indicating system of civil aircraft water system

Abstract

The invention belongs to the field of civil aircraft water systems, and relates to a civil aircraft water system ground water quantity indicating system which comprises a water quantity indicator, a water system controller, a sensor group and a power supply. The sensor group is arranged in the water tank and the pipeline and is used for sending measured data to the water system controller; the water system controller judges the water volume in the water tank according to measurement data of the sensor group; the water system controller controls the water quantity indicator to indicate different states according to the water quantity in the water tank.

Description

Technical Field

[0001] The invention belongs to the field of water systems for civil aircraft, and relates to a ground water quantity indicating system for a water system for a civil aircraft. Background Art

[0002] With the development of the world's aviation industry, civil aviation transportation volume continues to grow, and the civil aviation market shows a trend of diversified development, which puts forward higher requirements on the performance, comfort, economy and safety of aircraft. The water system provides drinking water, washing water and flushing water for crew members and passengers throughout the operation of the aircraft. The ground water indicator is mainly used to display the full water level and drainage status of the water tank during ground service, and remind ground staff to add water / drain water during ground service.

[0003] The traditional civil aircraft water system ground water level indicator is only equipped with a light-emitting diode indicator light, without text prompts, which cannot meet the needs of ground use. At the same time, the traditional water system only has a full water level alarm function but no water shortage and underpressure alarm function. Once a leak or pipe damage causes a pressure drop during normal flight, it is impossible to detect and take measures in time, resulting in serious consequences. Therefore, it is necessary to design a new civil aircraft water system ground water level indicator system to solve the above problems. Summary of the invention

[0004] Aiming at the high efficiency and reliability of the water system of civil aircraft, the present invention proposes a ground water level indication system for the water system of civil aircraft, which is equipped with two light emitting diodes and adds text prompts to display the full water level of the water tank and the status of drainage, and at the same time prompts ground staff to perform water adding / draining operations during ground service.

[0005] The ground water volume indicating system of the water system of a civil aircraft of the present invention has an added function of water shortage and underpressure alarm. If a water tank leaks or a pipe is damaged during flight, resulting in pressure drop and other faults, the maintenance personnel are reminded immediately and measures are taken, which can effectively reduce the accident rate and ensure the safety of the aircraft and passengers.

[0006] Technical Solution

[0007] A ground water quantity indication system for a water system of a civil aircraft, comprising: a water quantity indicator, a water system controller, a sensor group, and a power supply;

[0008] The sensor group is arranged in the water tank and the pipeline, and the sensor group sends the measurement data to the water system controller;

[0009] The water system controller determines the amount of water in the water tank based on the measurement data of the sensor group;

[0010] The water system controller controls the water level indicator to indicate different states according to the water level in the water tank.

[0011] Further, the water level indicator comprises: a housing, a rear cover, an electrical connector, a protective lampshade, an indicator light circuit board, and a light emitting diode;

[0012] One end of the shell has an opening, and the other end has a flange edge on the outside; two diode mounting holes are provided at the bottom of the opening end of the shell;

[0013] Two light emitting diodes of different colors are respectively arranged in two diode mounting holes, and a protective lampshade is installed in the diode mounting hole to protect the light emitting diodes;

[0014] The circuit board is arranged in the housing and connected to the two light emitting diodes; a rear cover is installed at one end of the housing opening, and an electrical connector is installed on the rear cover;

[0015] One end of the electrical connector extends into the rear cover and is connected to the circuit board, and the other end of the electrical connector is connected to the water system controller;

[0016] The two light emitting diodes are respectively a first diode and a second diode.

[0017] Furthermore, the sensor group includes: a liquid level sensor and a water tank pressure sensor arranged in the water tank.

[0018] Furthermore, the sensor group also includes: a plurality of pipeline pressure sensors arranged in the water system pipeline.

[0019] Furthermore, the water system controller determines the water volume in the water tank as follows:

[0020] There are five liquid level sensors installed in the water tank, corresponding to the liquid level states of 0%, 25%, 50%, 75% and 100% in the water tank respectively. The water level sensor in the water tank monitors the water level information in real time and sends digital signals to the water system controller through the CAN bus. At the same time, the water tank and pipeline are equipped with pressure sensors, which measure the pressure information of the water tank and pipeline in real time and send digital signals to the water system controller through the CAN bus. The water system controller determines the amount of water in the water tank based on the real-time input information of the water tank liquid level sensor and the water tank pressure sensor.

[0021] Further, when the water volume in the water tank is ≤25%, the ground staff performs water adding operation, and when the water added reaches 100% of the preset water level in the water tank, the water system controller sends a signal to the ground water volume indicator, and the ground water volume indicator controls the first diode to light up;

[0022] When adding water on the ground, the ground staff connects the water supply pipe of the water adding truck to the adding / draining switch, and the water from the water adding truck enters the water tank through the water pipe, and the air in the water tank is discharged through the overflow / vent pipe on the water tank. The water system controller captures the preset water level (0%, 25%, 50%, 75%, 100%) of the cabin management system for the water tank. The water level sensor and pressure sensor in the water tank monitor the water level information in real time and send a digital signal to the water system controller through the CAN bus. After the water in the water tank is added to the preset water level of 100%, the water system controller sends a discrete signal to the ground water level indicator to control the first diode to light up. At the same time, the system controller sends a signal to the adding / draining valve through the CAN bus to control it to close, and the water adding is completed.

[0023] Furthermore, the liquid level sensor and pressure sensor in the water tank monitor the water level information in real time. When the ground staff needs to perform drainage operation, the filling / draining switch is placed in the drainage position, and the water system controller sends a signal to the ground water level indicator, and the ground water level indicator controls the second diode to light up;

[0024] When the ground is drained, the water level sensor and pressure sensor in the water tank monitor the water level information in real time and send digital signals to the water system controller through the CAN bus. When the water in the water tank needs to be discharged, the add / drain switch is placed in the drainage position. At this time, the add / drain switch sends a signal to the water system controller to indicate the start of drainage. The water system controller sends a discrete signal to the ground water level indicator to control the first diode to light up; when the water in the water tank is discharged, the water system controller sends a discrete signal to the ground water level indicator to control the second diode to go out. At the same time, the system controller sends a signal to the add / drain valve through the CAN bus to control it to close, and the drainage is completed.

[0025] Furthermore, when the water tank pressure sensor or the water tank pipeline pressure sensor is lower than 15Psig, the second diode is controlled to flash to give a water shortage and underpressure alarm;

[0026] During the flight of the aircraft, the pressure sensors installed in the water tank and pipelines can measure the water tank and pipeline pressure information in real time, and send digital signals to the water system controller through the CAN bus. When the water tank pressure sensor or the pipeline pressure sensor is lower than 15Psig, the water system controller sends a discrete signal to the ground water level indicator to control the second diode to flash, and issue a water shortage and underpressure alarm.

[0027] Technical Effects

[0028] 1. The present invention designs a ground water volume indication system for a water system of a civil aircraft, which can display the full water level of the water tank and the status of drainage, and remind ground crew to perform water adding / draining operations during ground service.

[0029] 2. The present invention has a newly added water shortage and underpressure alarm function. When a water tank leaks or a pipe is damaged during flight, resulting in a pressure drop failure, the maintenance personnel can be reminded immediately, which can effectively reduce the accident rate of the aircraft.

[0030] 3. The present invention has a simple structural design, a relatively easy manufacturing process, low cost and high reliability, and is easy to install. It can maintain a stable and reliable working state in various harsh environments and can be widely used in multiple models of aircraft in the aviation field. It is of great significance to improve the operating efficiency and safety of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the working principle diagram of the surface water indication system;

[0032] Figure 2 This is the structural diagram of the surface water indicator;

[0033] Figure 3 This is the circuit diagram of the ground water indication system;

[0034] Figure 4 It is the signal cross-linking relationship diagram of the surface water indication system;

[0035] Figure 5 This is the discrete signal output circuit diagram of the ground water indication system controller. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] This section is an embodiment of the present invention, which is used to explain and illustrate the technical solution of the present invention.

[0038] A ground water level indicator for a water system of a civil aircraft, characterized by comprising a housing 3, a back cover 2, an electrical connector 1, a protective lampshade 5, a protective lampshade sealing pad 7, a sealing ring 8, a conductive sealing pad 9, a mounting sealing pad 6, and an indicator light circuit board assembly 4.

[0039] The housing 3 has holes dug inside to place the indicator circuit board assembly 4, the protective lampshade 5 and the protective lampshade sealing gasket 7. The top flange of the housing has a flange edge with a diameter of Φ64mm and a thickness of 2mm. The two light-emitting diodes on the upper end face of the flange edge are respectively engraved with "FULL" to indicate the full water level state of the water tank and "DRAIN" to indicate the drainage state; the flange edge is evenly distributed with six threaded through holes, and is installed on the water system service panel through the installation sealing gasket 6 installed on the lower end face and the countersunk screws; three threaded holes are opened on the side of the bottom of the housing. Furthermore, the material of the installation sealing gasket is 6143 silicone rubber, with an inner diameter of Φ38mm, an outer diameter of Φ64mm, and a thickness of 0.81mm, which is used to fix the ground water level indicator to the water system service panel.

[0040] The lower side of the rear cover 2 is connected to the bottom of the housing through three pan head screws. Furthermore, a 1.4mm deep groove is opened on the upper side of the rear cover, and an O-ring 8 is installed to ensure the contact with the housing, which has good waterproof performance and air tightness. A threaded hole is opened on the lower end face of the rear cover, and an electrical connector is installed through a conductive sealing pad 9 and four countersunk screws. Furthermore, the conductive sealing pad is made of 40-XX-XXXX-1285 conductive rubber, with an outer side length of 27mm, an inner through hole diameter of Φ18mm, and a thickness of 0.81mm. It is used to prevent external moisture and dust from penetrating into the ground water indicator, and at the same time connect the rear cover and the electrical connector to meet the requirements of its lap resistance.

[0041] The electrical connector 1 uses the D38999 / 20FB98PN square disk electrical connector, which includes main components such as contacts and connectors, wherein the connectors use BNC pins and the contacts are PTH contacts; the matching connector model is D38999 / 26FB98SN, one end of the electrical connector is connected to the indicator circuit board assembly 4 through a wire, and the other end is connected to the water system controller to realize signal input / output.

[0042] The indicator circuit board assembly 4 includes an indicator circuit board, two light-emitting diodes and two matching thin-film chip fixed resistors. Four lead wires are installed on the indicator circuit board, one of which is the positive lead wire of the power supply, the other two are the negative lead wires of the indicator light, and there is also a ground lead wire. The indicator circuit board has a size of Φ34.5mm and a thickness of about 2mm. An insulating paper partition is installed between the indicator circuit board and the three wirings at the bottom of the shell to prevent short circuits. Each small capacitor on the indicator circuit board is affixed with an insulating tin foil to avoid damage to components due to static electricity or electromagnetic interference caused by the lines being too close. In addition, it also avoids the problem of oxidation on the surface of components affecting the conduction performance. Further, the components on the indicator circuit board are compactly arranged, which is convenient for production and assembly and reduces the volume, and can effectively save space resources. The light-emitting diodes are selected in aviation green and aviation red colors, respectively, and have two display modes: constant and stroboscopic; the thin-film chip fixed resistor is used to adjust the brightness parameters of the light-emitting diodes, which is convenient for ground service personnel to quickly and accurately judge the water level without relying on other auxiliary equipment such as computer display screens, greatly reducing the burden on the system.

[0043] The protective lampshade 5 is made of YB-3 organic glass, which is used to provide mechanical and optical protection for the light emitting diode inside and also plays a role in heat dissipation.

[0044] The protective lampshade sealing pad 7 is made of 6143 silicone rubber, which is used to ensure that the indicator light circuit board assembly, the protective lampshade and the housing have good waterproof performance and air tightness.

[0045] The indicator light circuit board assembly 4, the protective lampshade 5 and the protective lampshade sealing gasket 7 are connected and fixed to the inside of the housing by countersunk screws.

[0046] A ground water level indicator for a water system of a civil aircraft, characterized in that it comprises a housing, a back cover, an electrical connector, a protective lampshade, a protective lampshade sealing pad, a sealing ring, a conductive sealing pad, a mounting sealing pad, and an indicator circuit board assembly, wherein the indicator circuit board assembly comprises an indicator circuit board, a light emitting diode, and a thin film chip fixed resistor, as shown in the attached drawings for details. Figure 2 The structure diagram of the ground water level indicator. The present invention is installed on the water system service panel, and is mainly used to display the full water level of the water tank and the status of drainage: 1) When draining water on the ground, the second diode lights up until the drainage is completed, and the second diode goes out; 2) When adding water on the ground, when the water tank reaches the preset water level, the first diode lights up, indicating that the water tank has reached the full water level state; in ground service, ground staff perform water adding / draining operations accordingly. When the water tank leaks or the pipeline is damaged during flight, resulting in a pressure drop failure, the second diode flashes, and a water shortage and underpressure alarm is issued to remind the maintenance staff.

[0047] The working principle of the ground water level indicator is that when ground drainage is required, the ground staff switches the water system water supply and drainage switch to the drainage gear, and the system controller controls the relevant equipment to drain the water in the water tank and pipeline. At the same time, power is supplied to the drainage circuit of the ground water level indicator, and the LED light is illuminated. The light passes through the protective glass lampshade and transmits the light signal to the ground staff from the hole on the flange surface until the water supply / drainage switch is placed in the "NORMAL" position. After receiving the signal, the system controller stops supplying power to the ground water level indicator, and the second diode goes out. For details, see the attached Figure 3 Circuit diagram of the ground water level indication system.

[0048] When adding water on the ground, the ground staff connects the water supply pipe of the water adding truck to the adding / draining switch, and the water from the water adding truck enters the water tank through the water pipe, and the air in the water tank is discharged through the overflow / vent pipe on the water tank. The water system controller captures the preset water level (0%, 25%, 50%, 75%, 100%) of the cabin management system for the water tank. The water level sensor and pressure sensor in the water tank monitor the water level information in real time and send a digital signal to the water system controller through the CAN bus. After the water in the water tank is added to the preset water level of 100%, the water system controller sends a discrete signal to the ground water level indicator to control the first diode to light up. At the same time, the system controller sends a signal to the adding / draining valve through the CAN bus to control it to close, and the water adding is completed.

[0049] When draining water from the ground, the water level sensor and pressure sensor in the water tank monitor the water level information in real time and send digital signals to the water system controller via the CAN bus. When the water in the water tank needs to be drained, the add / drain switch is placed in the drain position. At this time, the add / drain switch sends a signal to the water system controller to indicate that drainage has begun. The water system controller sends a discrete signal to the ground water level indicator to control the first diode to light up. When the water in the water tank is drained, the water system controller sends a discrete signal to the ground water level indicator to control the second diode to go out. At the same time, the system controller sends a signal to the add / drain valve via the CAN bus to control it to close, and drainage is completed. See the attached for details. Figure 1 Schematic diagram of the working principle of the surface water indication system.

[0050] The water tank and pipeline are equipped with pressure sensors, which measure the water tank and pipeline pressure information in real time and send digital signals to the water system controller through the CAN bus. When the aircraft has a water tank leak or a pipeline damage resulting in a pressure drop failure, the water tank pressure sensor or pipeline pressure sensor is lower than 15Psig, and the water system controller sends a discrete signal to the ground water indicator to control the second diode to flash and issue a water shortage and underpressure alarm. This is to remind the maintenance task to pay attention to the aircraft failure. For details, see the attached Figure 4 Surface water volume indication system signal cross-linking diagram, Figure 5 Discrete signal output circuit diagram of the ground water level indication system.

Claims

1. A civil aircraft water system ground water quantity indication system, characterized by: The system includes: a water quantity indicator, a water system controller, a sensor group, and a power supply; The sensor group is arranged in the water tank and the pipeline, and the sensor group sends the measurement data to the water system controller; The water system controller determines the amount of water in the water tank based on the measurement data of the sensor group; The water system controller controls the water level indicator to indicate different states according to the water level in the water tank.

2. The system according to claim 1, characterized in that: The water quantity indicator comprises: a housing, a rear cover, an electrical connector, a protective lamp cover, an indicator light circuit board, and a light emitting diode; One end of the shell has an opening, and the other end has a flange edge on the outside; two diode mounting holes are provided at the bottom of the opening end of the shell; Two light emitting diodes of different colors are respectively arranged in two diode mounting holes, and a protective lampshade is installed in the diode mounting hole to protect the light emitting diodes; The circuit board is arranged in the housing and connected to the two light emitting diodes; a rear cover is installed at one end of the housing opening, and an electrical connector is installed on the rear cover; One end of the electrical connector extends into the rear cover and is connected to the circuit board, and the other end of the electrical connector is connected to the water system controller; The two light emitting diodes are respectively a first diode and a second diode.

3. The system according to claim 2, characterized in that: The sensor set includes: A liquid level sensor and a water tank pressure sensor are arranged in the water tank, and a pipeline pressure sensor is arranged in the pipeline.

4. The system according to claim 3, characterized in that: The sensor group further includes: a plurality of pipeline pressure sensors arranged in the water system pipeline.

5. The system according to claim 4, characterized in that: The process of the water system controller judging the water volume in the water tank is as follows: There are five liquid level sensors installed in the water tank, corresponding to the liquid level states of 0%, 25%, 50%, 75% and 100% in the water tank respectively. The water level sensor in the water tank monitors the water level information in real time and sends digital signals to the water system controller through the CAN bus. At the same time, the water tank and pipeline are equipped with pressure sensors, which measure the pressure information of the water tank and pipeline in real time and send digital signals to the water system controller through the CAN bus. The water system controller determines the amount of water in the water tank based on the real-time input information of the water tank liquid level sensor and the water tank pressure sensor.

6. The system according to claim 5, characterized in that: When the water level in the water tank is ≤25%, the ground staff will add water. When the water level reaches 100% of the preset water level in the water tank, the water system controller sends a signal to the ground water level indicator, and the ground water level indicator controls the first diode to light up.

7. The system according to claim 6, characterized in that: The liquid level sensor and pressure sensor in the water tank monitor the water level information in real time. When the ground staff needs to perform drainage operations, the fill / drain switch is placed in the drainage position, and the water system controller sends a signal to the ground water level indicator, which controls the second diode to light up.

8. The system according to claim 7, characterized in that: When the water tank pressure sensor or the water tank pipeline pressure sensor is lower than 15Psig, the second diode is controlled to flash, and a water shortage and underpressure alarm is issued.

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