Function inspection device for pressure difference sensor of certain type

Abstract

The utility model belongs to the field of electromechanical systems-environment control systems, and relates to a function inspection device for a certain type of differential pressure transducer, which comprises an airtight box body, an inflation device, a differential pressure transducer, a digital display type pressure gauge, a cargo hold door control circuit and a test lamp, and is characterized in that the inflation device is arranged on the outer side of the airtight box body and is communicated with the interior of the airtight box body through an airtight hose; the digital display type pressure gauge is installed on the airtight box body and used for sensing gas pressure in the airtight box body, the differential pressure sensor is arranged in the airtight box body, a cable through hole is formed in the side face of the airtight box body, and a cable plug of the differential pressure sensor penetrates through the cable through hole to be electrically connected with a cargo hold door control circuit. A first branch of the cargo door control circuit is electrically connected with the test lamp, a second branch of the cargo door control circuit is electrically connected with the cargo door control system through a switch, a pipeline through hole is further formed in the airtight box body, and an inner cavity of the differential pressure sensor penetrates out of the pipeline through hole through an airtight hose to be communicated with the atmosphere.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electromechanical system - environmental control system field relates to a certain type pressure difference sensor function check device, for the CG-1 type pressure difference sensor of commonly used on transport aircraft self function check. BACKGROUND

[0002] The cabin pressure regulating system on the current transport aircraft is used for detecting and transmitting cabin pressure difference signals and making feedback to the on-board pressure regulating system according to the cabin pressure difference signals, and a CG-1 type pressure difference sensor is selected to be connected to the cabin pressure regulating system circuit to realize the above functions. The CG-1 type pressure difference sensor is generally installed and tested for its normal function with the aircraft air tightness after installation. However, during actual testing, the finished product may occasionally malfunction, resulting in complex disassembly and troubleshooting work, causing the test work to stop, the aircraft production schedule to lag, and the like. Therefore, a function check device for the CG-1 type finished product before cabin pressure testing is needed to ensure that the cabin pressure testing work can be smoothly carried out after the finished product is installed. SUMMARY

[0003] The utility model solves the technical problem: the utility model overcomes the deficiency in the prior art and provides a reliable and convenient CG-1 type pressure difference sensor self function check device which is easy to operate.

[0004] TECHNICAL SCHEME

[0005] A certain type pressure difference sensor function check device, comprising an air-tight box body, an inflation device, a pressure difference sensor, a digital display pressure gauge, a cargo door control circuit, and a test lamp, wherein the air-tight box body is provided with an inflation device on the outside, the inflation device is connected to the inside of the air-tight box body through an air-tight hose, the digital display pressure gauge is installed on the air-tight box body and used for sensing the gas pressure in the air-tight box body, the pressure difference sensor is arranged in the air-tight box body, a cable passing hole is arranged on the side surface of the air-tight box body, the cable plug of the pressure difference sensor passes through the cable passing hole and is electrically connected to the cargo door control circuit, the first branch of the cargo door control circuit is electrically connected to the test lamp, the second branch of the cargo door control circuit is electrically connected to the cargo door control system through a switch, and a pipeline passing hole is further arranged on the air-tight box body, the internal cavity of the pressure difference sensor is connected to the atmosphere through the pipeline passing hole and the air-tight hose.

[0006] Further, the top of the air-tight box body is provided with a top cover, and the top cover is movably connected to the air-tight box body.

[0007] Further, a handle is arranged on the top cover.

[0008] Further, the inflation device is an inflation pump.

[0009] Further, the cargo compartment door control circuit comprises a switch, a plug CZ, and a cable, wherein the plug CZ is provided with four holes numbered 1-4, the switch is connected to the first and third holes of the plug CZ through the cable, the second hole of the plug CZ is connected to the safety valve circuit, and the fourth hole of the plug CZ is connected to the cargo bridge lock normal control hydraulic electromagnetic valve plug, and the cargo bridge lock normal control hydraulic electromagnetic valve plug is connected to the test lamp.

[0010] Further, the differential pressure sensor is internally provided with a micro switch, wherein the micro switch comprises two pairs of contacts, i.e., a pair of contacts numbered 1 and 2 and a pair of contacts numbered 3 and 4, and further comprises a spring sheet, which is connected to the contacts 1 and 2 or the contacts 3 and 4 according to the pressure change in the differential pressure sensor.

[0011] Further, the first to fourth contacts in the micro switch are connected to the first to fourth holes of the plug CZ one by one.

[0012] Beneficial effects

[0013] The utility model provides a kind of differential pressure sensor function checking device, and its test box body adopts the material of higher airtightness and not fear high pressure and box body is equipped with sealing ring further guarantee airtightness, with better airtightness and reliability;Box whole volume is smaller, convenient to carry transport, easy to operate, and pressure bearing performance is good.Box is equipped with special cable through hole and pipeline through hole.There are sealing ring to ensure airtightness at through hole.The inflation device adopts portable and easy-to-operate air pump with powerful power, small body and gear control inflation speed.It is simple to operate and has high reliability.Digital pressure gauge is used for pressure gauge, and real-time pressure value can be directly read.The equipment used in the whole experimental device is simple, easy to operate, and the effect is good, with high reliability, which avoids the phenomenon that aircraft production progress is restricted due to differential pressure sensor failure.

[0014] A small portable closed experimental device is established by sealing box to simulate the working environment of differential pressure sensor.The differential pressure sensor is loaded into test box, and still uses on-board cargo compartment door control circuit to test.The inflation device is used to inflate the test box to simulate the effect of secondary airtightness of aircraft.The pressure gauge with visible and direct reading is mounted on the test box.The indicator lamp is connected in the cargo compartment door circuit to directly feedback the on-off of the circuit.The inflation of test box and observation of pressure gauge value and indicator lamp signal can determine whether the differential pressure sensor works normally. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is CG-1 differential pressure sensor structure schematic view;

[0016] Figure 2 It is CG-1 differential pressure sensor structure plan view;

[0017] Figure 3 The internal microswitch principle diagram of the CG-1 pressure difference sensor;

[0018] Figure 4 The schematic diagram of the pressure difference sensor function inspection device;

[0019] Figure 5 The schematic diagram of the pressure difference sensor circuit working principle;

[0020] Figure 6 The schematic diagram of the air-tight connection assembly;

[0021] Figure 7 The schematic diagram of the pressure difference sensor function inspection device;

[0022] 1, screw one, 2, spring, 3, spring seat, 4, adjusting screw, 5, nut one, 6, elbow joint, 7, sealing ring, 8, nut two, 9, outer shell, 10, upper cover, 11, gasket, 12, support rod, 13, diaphragm, 14, microswitch, 15, screw two, 16, nut three, 17, screw three, 18, electric plug seat; 1a, air-tight box, 2a, digital display pressure gauge, 3a, air pump, 4a, pressure difference sensor, 5a, handle, 6a, pipeline through hole, 7a, cable through hole, 8a, cargo compartment door control circuit, 9a, test lamp, 10a, switch. DETAILED DESCRIPTION

[0023] The features and illustrative embodiments of various aspects of the present application will be described below in detail. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without some or all of these specific details. The description of the embodiments is merely meant to provide a better understanding of the present application. The present application is not limited to any particular detailed set of operating conditions and methods, but covers any modifications, equivalents, and alternatives falling within the spirit of the present application. In the drawings and the following description, well-known structures and techniques have not been shown in order to avoid unnecessary obscurity of the present application.

[0024] It should be noted that the features of the embodiments of the present application and the embodiments can be combined with each other without conflict, and each embodiment can be mutually referenced and quoted. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] As Figures 1-3As shown, the CG-1 pressure difference sensor for function inspection of the utility model mainly consists of an upper cover 10, a supporting ring 12, an outer shell 9, a pressure sensitive element and two groups of identical micro switches 14 and an electric plug base 18. The pressure sensitive element comprises a metal diaphragm 13 and a common cylindrical spiral compression spring 2, the two micro switches 14 are fixed on the supporting ring 12 through two screws respectively, and the two electric sockets 18 are fixed on the outer shell 9 through four groups of screws 15 and nuts 16 respectively and are marked as CZ1, i.e. socket 1 and CZ2, i.e. socket 2.

[0026] The upper cover 10, the metal diaphragm 13 and the supporting ring 12 are fixed together through six screws 1, the upper cover 10 and the upper surface of the metal diaphragm 13 jointly form a sealed cavity, which is set as A cavity, the A cavity is communicated with the atmospheric pipeline on the airplane through an elbow joint 6, the pressure in the cavity is the same as the atmospheric static pressure.

[0027] The outer surface of the lower surface of the metal diaphragm 13 senses the cabin pressure, so that a pressure difference, i.e. cabin pressure difference, is formed on both sides of the diaphragm.

[0028] The working principle is as follows: one side of the hard core of the metal diaphragm is in contact with the spring 2, and the other side is in contact with the external contact of the micro switch 14. The pressure difference when the micro switch of the pressure difference sensor starts to be connected is 980±490Pa, the working pressure difference of the pressure difference sensor is 29.4KPa, and the maximum allowable pressure difference is 49.0KPa. The pressure difference sensor works by using the change of the internal and external pressure difference, the internal cavity senses the atmospheric static pressure of the outside world, and the external cavity senses the cabin pressure of the airplane, so that a pressure difference is formed in the sensor. When the pressure difference is greater than 980±490Pa, the hard core of the diaphragm compresses the spring piece to separate from the micro switch, the internal 3, 4 contacts of the micro switch are disconnected, and the cargo compartment control system control circuit is powered off;

[0029] When the pressure difference is equal to or less than 980±490Pa, the spring is stretched, the hard core of the diaphragm presses the external contact of the micro switch, the internal 3, 4 contacts of the micro switch are connected, and the cargo compartment control system control circuit is connected.

[0030] The utility model discloses a kind of differential pressure sensor function checking devices for this type differential pressure sensor, including airtight box 1a, inflation device 3a, differential pressure sensor 4a, digital display pressure gauge 2a, cargo door control circuit 8a, test lamp 9a, the airtight box 1a outside is provided with inflation device 3a, inflation device 3a is communicated with airtight box 1a inside by airtight hose, digital display pressure 2a table is installed on the airtight box 1a, for feeling the gas pressure in airtight box 1a, digital display pressure 2a table accuracy level 0.3 level, range ±30KPa;Differential pressure sensor 4a is arranged in airtight box 1a, cable passing hole 7a is arranged on the side of airtight box 1a, the cable plug of differential pressure sensor 4a passes through cable passing hole 7a and is electrically connected with cargo door control circuit 8a, the first branch of cargo door control circuit 8a is electrically connected with test lamp 9a, the second branch of cargo door control circuit 8a is electrically connected with cargo door control system by switch 10a, the airtight box 1a is also provided with pipeline passing hole 6a, the internal cavity of differential pressure sensor 4a, i.e. A cavity is communicated with atmosphere by airtight hose and passes pipeline passing hole 6a.

[0031] Wherein, the top of the airtight box 1a is provided with a top cover, and the top cover is movably connected with the airtight box 1a, so as to facilitate opening of the airtight box 1a and placing of the differential pressure sensor 4a therein. Wherein, a handle 5a is arranged on the top cover, so as to facilitate opening or closing of the airtight box 1a. The utility model simulates the change of the cabin air pressure by the change of the air pressure in the airtight box 1a, and senses the cabin air pressure on one side of the metal diaphragm 13 of the differential pressure sensor 4a and the atmospheric pressure on the other side, so as to check the function of the differential pressure sensor 4a by the change of the pressure difference.

[0032] Wherein, the inflation device 3a is a one-key operation type air pump, and the air suction pressure range is 500 Pa to 30 KPa.

[0033] Wherein, the cargo door control circuit 8a comprises a switch 10a, a plug CZ and a cable, the plug CZ is provided with plug holes numbered 1 to 4, the switch 10a is connected with the 1 and 3 holes of the plug CZ through the cable, the 2 hole of the plug CZ 1 is connected with a safety valve circuit, and the 4 hole of the plug CZ is connected with a cargo bridge lock normal control hydraulic electromagnetic valve plug, which is connected with the test lamp 9a.

[0034] Wherein, a microswitch is arranged in the differential pressure sensor 4a, the microswitch comprises two pairs of contacts, i.e. a pair of contacts numbered 1 and 2 and a pair of contacts numbered 3 and 4, and further comprises a spring sheet, which is connected with the contacts 1 and 2 or the contacts 3 and 4 according to the change of the pressure in the differential pressure sensor.

[0035] The 1-4th contacts in the micro switch are connected with the 1-4th holes of the plug CZ respectively.

[0036] In use, the differential pressure sensor 4a is placed in the test box 1a, the plug 1 of the differential pressure sensor 4a, i.e. CZ1, is connected with the cargo door control system through the switch to the socket CZ, at this time, the 1-4th contacts in the micro switch of the differential pressure sensor 4a are connected with the 1-4th holes of the plug CZ respectively, the 1 and 3 holes of the socket CZ of the differential pressure sensor 4a are connected with the cargo door control system through the switch 10a on the second branch, the 4th hole of the socket CZ of the differential pressure sensor 4a is connected with the test lamp 9a through the normally operated hydraulic valve plug of the cargo bridge lock on the first branch, and the air suction pump 3a is connected with the sealed box body 1a through the air-tight connection assembly. The upper cover of the test box is covered and locked. The digital display pressure gauge 2a is installed on the upper cover, and the measuring end of the digital display pressure gauge 2a is deep into the inside of the sealed box body 1a for sensing the air pressure in the sealed box body 1a, and the power supply to the cargo door control system can start the function check.

[0037] The air charging pump 3a is opened to charge air into the sealed box body 1a, at this time, the 3rd and 4th contacts of the micro switch in the differential pressure sensor 4a are connected, the 3rd hole of the socket CZ of the cargo door control system, the 3rd and 4th contacts of the micro switch, the 4th hole of the socket CZ, and the normally operated hydraulic valve plug of the cargo bridge lock are connected to the test lamp 9a, the function check circuit is in normal work, and the test lamp 9a is lighted. When the pressure difference between the inside and outside of the sealed box body 1a is 980Pa-6980Pa, the micro switch in the differential pressure sensor 4a is switched to the 1st and 2nd contacts, the 1st hole of the socket CZ of the cargo door control system, the 1st and 2nd contacts of the micro switch, and the 2nd hole of the socket CZ are connected to the safety valve circuit, the function check circuit is disconnected, and the test lamp 9a is extinguished. At this time, the differential pressure sensor has a clicking sound of the micro switch connected, which proves that the micro switch is switched from the 3rd and 4th contacts to the 1st and 2nd contacts. Then the sealed box body 1a is discharged, and when the pressure difference between the inside and outside of the sealed box body 1a is reduced to 980Pa±490Pa or below, the 3rd and 4th contacts of the micro switch are connected, and the test lamp is lighted.

[0038] According to the same method, the plug 2 of the differential pressure sensor, i.e. CZ2, is connected with the cargo door control system through the switch to the socket CZ, and the function of the differential pressure sensor of this type is checked again.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application.

Claims

1. A differential pressure sensor function checking device for a certain type of differential pressure sensor, characterized by comprising: The system includes an airtight chamber, an inflation device, a differential pressure sensor, a digital pressure gauge, a cargo door control circuit, and a test lamp. The inflation device is located on the outside of the airtight chamber and is connected to the inside of the chamber via an airtight hose. The digital pressure gauge is mounted on the airtight chamber to sense the gas pressure inside. The differential pressure sensor is located inside the airtight chamber, and a cable pass-through hole is provided on the side of the chamber. The cable plug of the differential pressure sensor passes through the cable pass-through hole and is electrically connected to the cargo door control circuit. The first branch of the cargo door control circuit is electrically connected to the test lamp, and the second branch of the cargo door control circuit is electrically connected to the cargo door control system via a switch. The airtight chamber also has a pipeline pass-through hole, through which the internal cavity of the differential pressure sensor is connected to the atmosphere via an airtight hose.

2. The differential pressure sensor function checking device according to claim 1, wherein The airtight box is provided with a top cover, which is movably connected to the airtight box.

3. The differential pressure sensor function testing device according to claim 2, characterized in that, The top cover is equipped with a handle.

4. The differential pressure sensor function testing device according to claim 2, characterized in that, The inflation device is an air pump.

5. The differential pressure sensor function testing device according to claim 1, characterized in that, The cargo door control circuit includes a switch, a plug CZ, and a cable. The plug CZ has holes numbered 1 to 4. The switch is connected to holes 1 and 3 of the plug CZ via the cable. Hole 2 of the plug CZ is connected to the safety valve circuit. Hole 4 of the plug CZ is connected to the plug of the cargo bridge lock normal operation hydraulic solenoid valve. The plug of the cargo bridge lock normal operation hydraulic solenoid valve is connected to the test light.

6. The differential pressure sensor function testing device according to claim 5, characterized in that, The differential pressure sensor is equipped with a micro switch, which includes two pairs of contacts, namely a pair of contacts numbered 1 and 2 and a pair of contacts numbered 3 and 4, and also includes a spring plate. The spring plate is connected to contacts 1 and 2 or contacts 3 and 4 according to the pressure change inside the differential pressure sensor.

7. A differential pressure sensor function testing device according to claim 6, characterized in that, The micro switch has contacts 1 to 4 inside that are connected to holes 1 to 4 of the plug CZ.

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