Airplane fire alarm signal system detection circuit

Abstract

The utility model discloses an airplane fire alarm signal system detection circuit, which comprises a detection circuit, the detection circuit comprises a power plug, a main switch K1, a wave band change-over switch K2, a panel detection signal lamp and an inspection plug, the positive electrode end of the power plug is respectively connected with one end of the main switch K1 and one end of the wave band switch K2, and the negative electrode end of the power plug is connected with one end of the panel detection signal lamp; the other end of the main switch K1, the other end of the wave band switch K2 and the other end of the panel detection signal lamp are connected to a socket matched with a CH2 bolt on a fire alarm signal processing device HJ-1 on an airplane. The inspection plug is used for being connected with a CH1 bolt on a fire alarm signal processing device HJ-1 on an airplane. According to the utility model, the inspection plug simulates different ignition conditions of an engine compartment, so that not only can the good performance of the fire alarm signal processing device HJ-1 be detected, but also the fault position of the fire alarm sensor can be quickly judged, the fault position can be replaced in a targeted manner, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of aviation test technology, and specifically relates to a detection circuit of an airplane fire alarm signal system. BACKGROUND

[0002] A certain type of single-engine airplane is equipped with a set of fire alarm signal system to detect the fire alarm situation in the engine compartment when the ground engine is working or in flight, and the fire alarm warning is carried out through light and earphone in the cabin and recorded in the flight parameter system. The inner wall of the engine compartment is spirally distributed with 6 fire alarm sensors along the engine axis to sense the possibility of fire in different parts of the front, middle and rear sections of the engine, and 2 sensors are distributed in each section. The fire alarm sensor is a thermal resistance type, and when the temperature around one or several fire alarm sensors is higher than 190 DEG C, the resistance of the fire alarm sensor increases, and the signal is sent to the fire alarm signal processing device HJ-1 on the airplane. The resistance signal is converted into voltage inside the fire alarm signal processing device and amplified into 27V direct current, and is output in multiple ways: one way is sent to the cabin to light the "engine fire" warning light, one way is sent to the cabin earphone to prompt the cabin personnel of the engine fire, one way is sent to the flight parameter recording system to record the time and duration of the fire, and one way is sent to the fire extinguishing bottle control circuit to automatically connect the explosion cap of the fire extinguishing bottle to extinguish the fire. If the fire extinguishing agent in the automatic fire extinguishing bottle is used up, the fire alarm signal still exists, and the cabin personnel can manually connect the "engine fire extinguishing" switch to manually extinguish the fire.

[0003] In current engineering practice, false alarm of fire alarm frequently occurs, especially false alarm in the air causes great pressure to the pilot. The main reason for false alarm is the fault of the fire alarm signal processing device HJ-1 or the fault of the fire alarm sensor. After the fault occurs, the engineering personnel can only replace the fire alarm signal processing device or the fire alarm sensor to eliminate the fault, which is time-consuming and labor-consuming. In addition, the original fire alarm check instrument provided with the airplane is large in size and complex in operation, and can only detect the good performance of the fire alarm signal processing device. UTILITY MODEL CONTENTS

[0004] The technical problem to be solved by the utility model is to overcome the problems in the prior art, provide a detection circuit of an airplane fire alarm signal system, overcome the problem of difficult fault positioning after false alarm of the fire alarm system occurs, and improve the airplane maintenance efficiency.

[0005] To solve the above technical problems, a technical scheme provided by the utility model is as follows:

[0006] An aircraft fire signal system detection circuit, comprising a detection circuit, the detection circuit comprising a power plug, a total switch K1, a wave band conversion switch K2, a panel detection signal lamp and an inspection plug, the power plug, the total switch K1, the wave band conversion switch K2 and the panel detection signal lamp are all arranged on a detection circuit panel, the positive terminal of the power plug is connected with one end of the total switch K1 and the wave band switch K2 respectively, and the negative terminal is connected with one end of the panel detection signal lamp; the other end of the total switch K1, the wave band switch K2 and the panel detection signal lamp are all connected to a socket matched with a CH2 pin on a fire signal processing device HJ-1 on an aircraft; the inspection plug is used to be connected with a CH1 pin on the fire signal processing device HJ-1 on the aircraft.

[0007] Further, the socket is provided with connection channels a-h, j, k, m and n matched with the CH2 pin on the fire signal processing device HJ-1 on the aircraft, the other end of the total switch K1 is connected with the connection channel a on the socket, the panel detection signal lamp comprises a panel detection signal lamp L1, a panel detection signal lamp L2 and a panel detection signal lamp L3, one end of the panel detection signal lamp L1, the panel detection signal lamp L2 and the panel detection signal lamp L3 is connected with the negative terminal of the power plug respectively, and the other end is connected with the corresponding connection channel d-f on the socket respectively.

[0008] Further, the wave band conversion switch K2 is divided into 0-6, a total of 7 gears, 0 gear is empty, 1-2 gears are connected with the connection channels g-h on the socket respectively, 3-4 gears are connected with the connection channels j-k on the socket respectively, and 5-6 gears are connected with the connection channels m-n on the socket respectively.

[0009] Further, the inspection plug comprises a No. 1 inspection plug, a No. 2 inspection plug, a No. 3 inspection plug, a No. 4 inspection plug and a No. 5 inspection plug, the No. 1 inspection plug, the No. 2 inspection plug, the No. 3 inspection plug, the No. 4 inspection plug and the No. 5 inspection plug are respectively connected with a resistance R1 and a resistance R2.

[0010] The resistance R1 and the resistance R2 have different resistance values, for example, the resistance R1 is 5Ω, and the resistance R2 is 3Ω.

[0011] Further, the power plug is a 27V DC power plug, and the power plug is directly connected with an aviation power supply vehicle or an airport ground power supply.

[0012] The wave band switch K2 is used to switch the 6 fire alarm sensors in the engine cabin, and is placed in 0 gear when not in use; 2 of the 6 fire alarm sensors are located in the front section of the engine, 2 are located in the middle section of the engine, and 2 are located in the rear section of the engine; gears 1-2 on the wave band switch K2 correspond to the 2 fire alarm sensors located in the front section of the engine; gears 3-4 on the wave band switch K2 correspond to the 2 fire alarm sensors located in the middle section of the engine; and gears 5-6 on the wave band switch K2 correspond to the 2 fire alarm sensors located in the rear section of the engine.

[0013] The panel detection signal light L1 is used to indicate a fire alarm in the front section of the engine of the aircraft, or a failure of the 2 fire alarm sensors in the front section of the engine, or a failure of the fire alarm signal processing device HJ-1.

[0014] The panel detection signal light L2 is used to indicate a fire alarm in the middle section of the engine of the aircraft, or a failure of the 2 fire alarm sensors in the middle section of the engine, or a failure of the fire alarm signal processing device HJ-1.

[0015] The panel detection signal light L3 is used to indicate a fire alarm in the rear section of the engine of the aircraft, or a failure of the 2 fire alarm sensors in the rear section of the engine, or a failure of the fire alarm signal processing device HJ-1.

[0016] The No. 1 inspection plug, the No. 2 inspection plug, the No. 3 inspection plug, the No. 4 inspection plug, and the No. 5 inspection plug are used to replace the thermal resistance signals of the fire alarm sensors to simulate the fire alarm signals on the aircraft, so as to determine the good quality of the fire alarm signal processing device and the good quality of the fire alarm sensors.

[0017] The No. 1 inspection plug is used to simulate a full engine fire, and the good quality of the fire alarm signal processing device HJ-1 is determined by observing that the panel signal light L1, the panel signal light L2, and the panel signal light L3 are all bright.

[0018] The No. 2 inspection plug is used to simulate a fire in the front section of the engine, and the good quality of the fire alarm signal processing device HJ-1 and the good quality of the 2 fire alarm sensors in the front section of the engine are determined by observing that the panel signal light L1 is bright and the panel signal light L2 and the panel signal light L3 are extinguished.

[0019] The No. 3 inspection plug is used to simulate a fire in the middle section of the engine, and the good quality of the fire alarm signal processing device HJ-1 and the good quality of the 2 fire alarm sensors in the middle section of the engine are determined by observing that the panel signal light L2 is bright and the panel signal light L1 and the panel signal light L3 are extinguished.

[0020] The No. 4 inspection plug is used to simulate a fire in the rear section of the engine, and the good quality of the fire alarm signal processing device HJ-1 and the good quality of the 2 fire alarm sensors in the rear section of the engine are determined by observing that the panel signal light L3 is bright and the panel signal light L1 and the panel signal light L2 are extinguished.

[0021] The No. 5 inspection plug is used to simulate that no fire has occurred in the engine, and the 6 sensors are all good, and the fire alarm signal processing device HJ-1 is determined to be good by observing that the signal light panel signal light L1, the panel signal light L2, and the panel signal light L3 are all off.

[0022] The aircraft originally has the aircraft cabin signal light L01, the aircraft cabin signal light L02, and the aircraft cabin signal light L03:

[0023] The aircraft cabin signal light L01 is used to indicate the fire alarm situation of the front section of the engine. If the aircraft cabin signal light L01 is on, it indicates that the front section of the engine of the aircraft is on fire, and a fire alarm (real alarm) is reported. Or the 2 fire alarm sensors on the front section of the engine are faulty, or the fire alarm signal processing device HJ-1 is faulty, and a fire alarm (false alarm) is reported.

[0024] The aircraft cabin signal light L02 is used to indicate the fire alarm situation of the middle section of the engine. If the aircraft cabin signal light L02 is on, it indicates that the middle section of the engine of the aircraft is on fire, and a fire alarm (real alarm) is reported. Or the 2 fire alarm sensors on the middle section of the engine are faulty; or the fire alarm signal processing device HJ-1 is faulty, and a fire alarm (false alarm) is reported.

[0025] The aircraft cabin signal light L03 is used to indicate the fire alarm situation of the rear section of the engine. If the aircraft cabin signal light L03 is on, it indicates that the rear section of the engine of the aircraft is on fire, and a fire alarm (real alarm) is reported. Or the 2 fire alarm sensors on the rear section of the engine are faulty; or the fire alarm signal processing device HJ-1 is faulty, and a fire alarm (false alarm) is reported.

[0026] If the aircraft is flying in the air or on the ground with power on, one or several of the aircraft cabin signal light L01, the aircraft cabin signal light L02, and the aircraft cabin signal light L03 in the cabin are always on, but no real fire alarm has occurred. At this time, the possible cause of the fault is that the fire alarm signal processing device HJ-1 reports a false alarm, or the fire alarm sensor reports a false alarm. To determine which aviation equipment is reporting a false alarm, the following methods can be used.

[0027] The specific method is:

[0028] Connect the detection circuit panel and the No. 1 inspection plug in the device to the fire alarm signal processing device HJ-1, then connect the power plug on the detection circuit panel to the aviation power supply vehicle or the airport ground power supply according to the polarity, turn on the main switch K1, and when the wave band switch K2 is set to 1, 2, 3, 4, 5, and 6 from 0 respectively, if the signal lamp panel signal lamp L1, the signal lamp panel signal lamp L2, and the signal lamp panel signal lamp L3 are always on, then turn off the main switch K1, set the wave band switch K2 to 0, replace the No. 1 inspection plug with the No. 5 inspection plug, and turn on the main switch K1, and when the wave band switch K2 is set to 1, 2, 3, 4, 5, and 6 from 0 respectively, if the signal lamp panel signal lamp L1, the signal lamp panel signal lamp L2, and the signal lamp panel signal lamp L3 are all off, it indicates that the fire alarm signal processing device HJ-1 has good transmission performance and no fault.

[0029] If the on-off state of the signal lamp panel signal lamp L1, the signal lamp panel signal lamp L2, and the signal lamp panel signal lamp L3 in the above operation does not match the above situation, it indicates that the fire alarm signal processing device HJ-1 has a fault and reports a false alarm. In actual maintenance, the fire alarm signal processing device HJ-1 should be replaced.

[0030] If the aircraft cabin signal lamp L01 is always on, replace the No. 5 inspection plug in the above connection circuit with the No. 2 inspection plug, use the inspection circuit to perform the above inspection, and if the signal lamp panel signal lamp L1 is always on when the wave band switch is set to 1 and 2 from 0 respectively, it further verifies the good performance of the fire alarm signal processing device HJ-1, and proves that at least one of the two fire alarm sensors in the front section of the aircraft has a fault. In actual maintenance, only the two fire alarm sensors in the front section of the aircraft need to be replaced.

[0031] If the aircraft cabin signal lamp L02 is always on, replace the No. 5 inspection plug in the above connection circuit with the No. 3 inspection plug, use the inspection circuit to perform the above inspection, and when the wave band switch is set to 3 and 4 from 0 respectively, the signal lamp panel signal lamp L2 is always on, which further verifies the good performance of the fire alarm signal processing device HJ-1, and proves that at least one of the two fire alarm sensors in the middle section of the aircraft has a fault. In actual maintenance, only the two fire alarm sensors in the middle section of the aircraft need to be replaced.

[0032] If the aircraft cabin signal lamp L03 is always on, replace the No. 5 inspection plug in the above connection circuit with the No. 4 inspection plug, use the inspection circuit to perform the above inspection, and when the wave band switch is set to 5 and 6 from 0 respectively, the signal lamp panel signal lamp L3 is always on, which further verifies the good performance of the fire alarm signal processing device HJ-1, and proves that at least one of the two fire alarm sensors in the rear section of the aircraft has a fault. In actual maintenance, only the two fire alarm sensors in the rear section of the aircraft need to be replaced.

[0033] The fire alarm signal processing device HJ-1 and the fire alarm sensor are tested by using the No. 1 inspection plug, the No. 2 inspection plug, the No. 3 inspection plug, the No. 4 inspection plug and the No. 5 inspection plug, the original airborne equipment working environment can be separated, the airborne equipment and the ground equipment are strictly separated, the fault isolation is more accurate, the fault can be further positioned quickly, the fault misjudgment and the repetitive replacement work are prevented, and the aircraft maintenance efficiency is improved.

[0034] The aircraft fire alarm signal system detection circuit has the advantages that:

[0035] 1、The aircraft fire alarm signal system detection circuit has the advantages that:

[0036] 2、The aircraft fire alarm signal system detection circuit has the advantages that:

[0037] 3、The aircraft fire alarm signal system detection circuit has the advantages that:

[0038] 4、The aircraft fire alarm signal system detection circuit has the advantages that:

[0039] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only part of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0041] Figure 1 The connection diagram of the aircraft fire alarm signal system detection circuit.

[0042] X-detection circuit panel, Y-27V DC power plug, HJ-1-fire alarm signal processing device, R-No. 1 inspection plug, S-No. 2 inspection plug, T-No. 3 inspection plug, V-No. 4 inspection plug, W-No. 5 inspection plug. DETAILED DESCRIPTION

[0043] Embodiments of the present application will be described in more detail below with reference to the drawings. Although some embodiments of the present application are shown in the drawings, it is understood that the present application can be implemented in various forms and should not be interpreted as being limited to the embodiments set forth herein, but rather these embodiments are provided so as to more completely and thoroughly understand the present application. It is understood that the drawings and embodiments of the present application are for exemplary purposes only and are not intended to limit the scope of protection of the present application.

[0044] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connecting", "fixing", "screw connection" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or direct connection, or indirect connection through intermediate medium, and those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0045] The names of the messages or information exchanged between the plurality of devices in the embodiments of the present application are only for illustrative purposes, and are not intended to limit the scope of the messages or information.

[0046] Embodiment one: as shown in the figure, Figure 1

[0047] An aircraft fire signal system detection circuit, comprising a detection circuit, the detection circuit is arranged on the detection circuit panel X, the detection circuit comprises a 27V DC power plug Y, a total switch K1, a wave band switch K2, a panel detection signal lamp L1, a panel detection signal lamp L2, a panel detection signal lamp L3, a No. 1 inspection plug R, a No. 2 inspection plug S, a No. 3 inspection plug T, a No. 4 inspection plug V and a No. 5 inspection plug W.

[0048] The positive terminal of the 27V DC power plug Y is connected with one end of the total switch K1 and the wave band switch K2 respectively, the negative terminal is connected with one end of the panel detection signal lamp L1, the panel detection signal lamp L2 and the panel detection signal lamp L3 respectively, the other end of the total switch K1 is connected with the connection channel a on the socket, the socket and the CH2 pin on the fire signal processing device HJ-1 on the aircraft are matched, the other end of the panel detection signal lamp L1, the panel detection signal lamp L2 and the panel detection signal lamp L3 is connected with the corresponding connection channel d-f on the socket respectively.

[0049] The wave band switch K2 is divided into 0-6, a total of 7 gears, 0 gear is empty, 1-2 gears are connected with the connection channel g-h on the socket respectively, 3-4 gears are connected with the connection channel j-k on the socket respectively, 5-6 gears are connected with the connection channel m-n on the socket respectively.

[0050] ​The No. 1 inspection plug R, the No. 2 inspection plug S, the No. 3 inspection plug T, the No. 4 inspection plug V and the No. 5 inspection plug W are used to connect with the CH1 pin of the fire alarm signal processing device HJ-1 on the airplane.

[0051] The No. 1 inspection plug R, the No. 2 inspection plug S, the No. 3 inspection plug T, the No. 4 inspection plug V and the No. 5 inspection plug W are respectively connected with a resistor R1 with a resistance of 5Ω and a resistor R2 with a resistance of 3Ω.

[0052] In this embodiment, the airplane cabin signal lamp L01 is always on, but there is no real fire alarm. At this time, the device is used to detect the fire alarm signal processing device HJ-1 and each fire alarm sensor to determine the fault location.

[0053] The socket in the device is plugged into the CH2 pin of the fire alarm signal processing device HJ-1, the No. 1 inspection plug R is plugged into the CH1 pin of the fire alarm signal processing device HJ-1, and then the 27V power plug Y is connected to the aviation power supply vehicle or the airport ground power supply according to the polarity. Turn on the main switch K1, and when the wave band switch K2 is set to 1, 2, 3, 4, 5, and 6 from 0 respectively, if the signal lamp panel signal lamp L1, the panel signal lamp L2, and the panel signal lamp L3 are always on, then turn off the main switch K1, set the wave band switch K2 to 0, replace the No. 1 inspection plug R with the No. 5 inspection plug W, and turn on the main switch K1. When the wave band switch K2 is set to 1, 2, 3, 4, 5, and 6 from 0 respectively, if the signal lamp panel signal lamp L1, the panel signal lamp L2, and the panel signal lamp L3 are all extinguished, it indicates that the fire alarm signal processing device HJ-1 has good transmission performance and no fault.

[0054] If the on-off situation of the panel signal lamp L1, the panel signal lamp L2, and the panel signal lamp L3 in the above operation does not match the above situation, it indicates that the fire alarm signal processing device HJ-1 has a fault and reports a false alarm. Only the fire alarm signal processing device HJ-1 needs to be replaced.

[0055] If the on-off situation of the panel signal lamp L1, the panel signal lamp L2, and the panel signal lamp L3 in the above operation matches the above situation, it indicates that the fire alarm signal processing device HJ-1 has good transmission performance and no fault. Then replace the No. 5 inspection plug W in the above connection circuit with the No. 2 inspection plug S, and use the inspection circuit to perform the above inspection. If the signal lamp panel signal lamp L1 is always on when the wave band switch is set to 1 and 2 from 0 respectively, it further verifies the good performance of the fire alarm signal processing device HJ-1, and proves that at least one of the two fire alarm sensors in the front section of the airplane is faulty. In actual aircraft maintenance, only the two fire alarm sensors in the front section of the airplane need to be replaced.

[0056] Example two: the difference between example one is that the aircraft cockpit signal light L02 is always on, but there is no real fire, at this time, the use of the device for fire signal processing device HJ-1 and each fire sensor detection to determine the fault location.

[0057] The socket in the device is inserted into the CH2 pin on the fire signal processing device HJ-1, the No. 1 inspection plug R is inserted into the CH1 pin on the fire signal processing device HJ-1, and then the 27V power plug Y is connected to the aviation power supply vehicle or the airport ground power supply according to the polarity. Turn on the main switch K1, and when the wave band switch K2 is set to 1, 2, 3, 4, 5, 6 from 0 respectively, if the signal light panel signal light L1, panel signal light L2, panel signal light L3 are always on, then turn off the main switch K1, set the wave band switch K2 to 0, replace the No. 1 inspection plug R with the No. 5 inspection plug W, and turn on the main switch K1. When the wave band switch K2 is set to 1, 2, 3, 4, 5, 6 from 0 respectively, if the signal light panel signal light L1, panel signal light L2, panel signal light L3 are all off, it indicates that the fire signal processing device HJ-1 transmission performance is good, no fault.

[0058] If the on-off situation of the panel signal light L1, panel signal light L2, panel signal light L3 in the above operation does not match the above situation, it indicates that the fire signal processing device HJ-1 is faulty and false alarm, and only needs to replace the fire signal processing device HJ-1.

[0059] If the on-off situation of the panel signal light L1, panel signal light L2, panel signal light L3 in the above operation matches the above situation, it indicates that the fire signal processing device HJ-1 transmission performance is good, no fault; then replace the No. 5 inspection plug W in the above connection circuit with the No. 3 inspection plug T, and use the inspection circuit to perform the above inspection. If the signal light panel signal light L2 is always on when the wave band switch is set to 3 and 4 from 0 respectively, it further verifies the good performance of the fire signal processing device HJ-1, and proves that at least one of the two fire sensors in the middle section of the aircraft is faulty. In actual maintenance, only the two fire sensors in the middle section of the aircraft need to be replaced.

[0060] Example three: the difference between example one and example two is that the aircraft cockpit signal light L03 is always on, but there is no real fire, at this time, the use of the device for fire signal processing device HJ-1 and each fire sensor detection to determine the fault location.

[0061] Insert the socket in the device into the CH2 pin of the fire alarm signal processing device HJ-1, insert the No. 1 inspection plug R into the CH1 pin of the fire alarm signal processing device HJ-1, then connect the 27V power plug Y to the aviation power supply vehicle or the airport ground power supply according to the polarity, turn on the main switch K1, when the wave band switch K2 is set to 1, 2, 3, 4, 5, 6 from 0 respectively, if the signal lamp panel signal lamp L1, the panel signal lamp L2 and the panel signal lamp L3 are always bright, then turn off the main switch K1, set the wave band switch K2 to 0, replace the No. 1 inspection plug R with the No. 5 inspection plug W, turn on the main switch K1, when the wave band switch K2 is set to 1, 2, 3, 4, 5, 6 from 0 respectively, if the signal lamp panel signal lamp L1, the panel signal lamp L2 and the panel signal lamp L3 are all off, it indicates that the transmission performance of the fire alarm signal processing device HJ-1 is good and there is no fault.

[0062] If the bright and off conditions of the panel signal lamp L1, the panel signal lamp L2 and the panel signal lamp L3 are not consistent with the above conditions in the above operation, it indicates that the fire alarm signal processing device HJ-1 is faulty and false alarm, and only the fire alarm signal processing device HJ-1 needs to be replaced.

[0063] If the bright and off conditions of the panel signal lamp L1, the panel signal lamp L2 and the panel signal lamp L3 are consistent with the above conditions in the above operation, it indicates that the transmission performance of the fire alarm signal processing device HJ-1 is good and there is no fault, then replace the No. 5 inspection plug W in the above connection circuit with the No. 4 inspection plug V, and use the inspection circuit to perform the above inspection, if the signal lamp panel signal lamp L3 is always bright when the wave band switch is set to 5 and 6 from 0 respectively, it further verifies the good performance of the fire alarm signal processing device HJ-1, and it is proved that at least one of the two fire alarm sensors in the rear section of the aircraft is faulty, and only the two fire alarm sensors in the rear section of the aircraft need to be replaced in actual aircraft maintenance.

[0064] The circuit can quickly determine the fault conditions of the fire alarm signal processing device and the fire alarm sensor, and determine the false alarm fault position through comparison, thereby providing support for rapid aircraft maintenance support.

[0065] It should be noted that the above is only a preferred embodiment of the utility model and the technical principle applied. Those skilled in the art will understand that the utility model is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the utility model. Therefore, although the utility model has been described in more detail through the above embodiments, the utility model is not limited to the above embodiments, and more other equivalent embodiments can be included without departing from the utility model concept, and the scope of the utility model is determined by the appended claims.

Claims

1. An aircraft fire alarm signal system detection circuit, characterized in that: The detection circuit includes a power plug, a main switch K1, a band switch K2, a panel detection signal light and an inspection plug. The power plug, the main switch K1, the band switch K2 and the panel detection signal light are all arranged on the detection circuit panel. The positive end of the power plug is connected to one end of the main switch K1 and the band switch K2 respectively, and the negative end is connected to one end of the panel detection signal light; the other ends of the main switch K1, the band switch K2 and the panel detection signal light are all connected to a socket that matches the CH2 pin on the fire alarm signal processing device HJ-1 on the aircraft; the inspection plug is used to connect to the CH1 pin on the fire alarm signal processing device HJ-1 on the aircraft.

2. The aircraft fire alarm signal system detection circuit according to claim 1, characterized in that: The socket is provided with connection channels ah, j, k, m and n that match the CH2 pin on the fire alarm signal processing device HJ-1 on the aircraft. The other end of the main switch K1 is connected to the connection channel a on the socket. The panel detection signal light includes a panel detection signal light L1, a panel detection signal light L2 and a panel detection signal light L3. One end of the panel detection signal light L1, the panel detection signal light L2 and the panel detection signal light L3 are respectively connected to the negative end of the power plug, and the other end are respectively connected to the corresponding connection channel df on the socket.

3. The aircraft fire alarm signal system detection circuit according to claim 2, characterized in that: The band conversion switch K2 is divided into 7 gears from 0 to 6, gear 0 is empty, gears 1-2 are respectively connected to the connection channel gh on the socket, gears 3-4 are respectively connected to the connection channel jk on the socket, and gears 5-6 are respectively connected to the connection channel mn on the socket.

4. The aircraft fire alarm signal system detection circuit according to claim 1 or 3, characterized in that: The inspection plugs include inspection plug No. 1, inspection plug No. 2, inspection plug No. 3, inspection plug No. 4 and inspection plug No. 5, and each of the inspection plug No. 1, inspection plug No. 2, inspection plug No. 3, inspection plug No. 4 and inspection plug No. 5 is connected to a resistor R1 and a resistor R2.

5. The aircraft fire alarm signal system detection circuit according to claim 4, characterized in that: The power plug is a 27V DC power plug, which is directly connected to an aviation power supply vehicle or an airport ground power supply.

Images