Portable auxiliary power device fuel oil electromagnetic valve testing device

Abstract

The utility model discloses a portable auxiliary power device fuel oil electromagnetic valve testing device which comprises a box body, a serial port relay is arranged in the box body, a first plug, a second plug and a power plug are arranged on the front side face of the box body, the power plug is connected with the serial port relay, and a flowmeter and a valve fixing tool are arranged on the upper surface of the box body. A protective transparent cover is further installed at the upper end of the box body through fixing screws, the first plug is connected with an electrical plug of a fuel oil electromagnetic valve fixed to the valve fixing tool through a wire bundle, a wire led out of the first plug is connected with a serial port relay, and the common end of the serial port relay is connected with a second plug. Compared with the prior art, the beneficial effects of the utility model are that the circuit control part, the pressure test part and the instrument interface part are integrated, the integration level is high, and the use is more portable and convenient; the testing device main body is made of polyurethane rigid plastic, and the protective transparent cover is arranged, so that the testing safety is effectively improved, and the testing device has a relatively high popularization value.

Description

Technical Field

[0001] This utility model relates to the field of auxiliary power unit fuel electromagnetic valve testing technology, specifically a portable auxiliary power unit fuel electromagnetic valve testing device. Background Technology

[0002] The fuel solenoid valve is a sensor used to control fuel distribution on the 131-9B auxiliary power unit (APU) of Boeing 737 series aircraft. Currently, there are two main methods for testing the fuel solenoid valve after repair. One method involves testing the fuel solenoid valve while it is running with the APU. The valve is installed on the corresponding APU model and tested along with the entire APU assembly. The servo performance of the fuel solenoid valve is judged through test data and visual observation. However, this testing method is extremely costly. The fuel solenoid valve cannot be replaced during the test run, so each fuel solenoid valve test requires a complete APU test, resulting in significant fuel consumption and potential damage to expensive components such as the impeller and turbine. Secondly, manual testing by workers involves connecting a series of instruments and equipment to manually test the fuel solenoid valve. This testing method requires the use of fuel test fluid with a certain degree of toxicity, which is volatile and can be inhaled by the test workers. The test also requires a test pressure of over 2000 kPa, which poses a risk of pipeline collapse under high pressure and injury to personnel. Furthermore, the testing process is relatively complex and cumbersome, requiring at least two people to cooperate. Therefore, we propose a portable auxiliary power unit fuel solenoid valve testing device. Utility Model Content

[0003] The purpose of this invention is to provide a portable auxiliary power unit fuel electromagnetic valve testing device to solve the problems mentioned in the background art.

[0004] A portable auxiliary power unit fuel electromagnetic valve testing device includes a housing, in which a serial port relay is installed. The front side of the housing is provided with plug one, plug two and a power plug, the power plug being connected to the serial port relay. The upper surface of the housing is provided with a flow meter and a valve fixing fixture. One end of the flow meter is connected to an oil pipe and the other end is connected to the oil outlet of the fuel electromagnetic valve. A protective transparent cover is also installed on the upper end of the housing by fixing screws, which facilitates the removal of the protective transparent cover.

[0005] The plug is connected to the electrical plug of the fuel solenoid valve fixed on the valve fixing fixture via a wire harness. Pins 1 and 2 of the plug are connected to the electrical plug of the fuel solenoid valve via a wire harness, and pin 3 of the plug is connected to the housing of the fuel solenoid valve via a wire harness. The wire harness is connected to the housing of the fuel solenoid valve via a circular connector.

[0006] The wires leading out from the plug are connected to the serial port relay. Pin 1 of the plug is connected to the normally open control terminals of the serial port relay (1, 3, and 5). Pin 2 of the plug is connected to the normally open control terminals of the serial port relay (2, 4, and 6). Pin 3 of the plug is connected to the normally open control terminal of the serial port relay (7).

[0007] The common terminal of the serial port relay is connected to plug two. The common hole of the control terminals of the serial port relay No. 1 and No. 2 is connected to pin No. 1 of plug two. The common hole of the control terminal of the serial port relay No. 3 is connected to pin No. 3 of plug two. The common hole of the control terminal of the serial port relay No. 4 is connected to pin No. 4 of plug two. The common hole of the control terminal of the serial port relay No. 5 is connected to pin No. 5 of plug two. The common hole of the control terminal of the serial port relay No. 6 is connected to pin No. 6 of plug two. The common hole of the control terminal of the serial port relay No. 7 is connected to pin No. 2 of plug two.

[0008] Preferably, the front end of the protective transparent cover has a perforation to facilitate the insertion of fuel lines and wires.

[0009] Preferably, the housing is made of rigid polyurethane plastic, which, while ensuring structural strength, reduces weight compared to metal, making it easier to carry, providing stronger insulation, and enhancing safety.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] When testing the fuel solenoid valve, first install the fuel solenoid valve on the valve fixing fixture, then connect the fuel supply return pipe to the fuel outlet of the fuel solenoid valve via a flow meter, and connect the fuel supply pipe to the fuel inlet of the fuel solenoid valve; then connect plug one to the electrical plug of the fuel solenoid valve fixed on the valve fixing fixture via a wire harness, connect plug two to the test host, and connect the power plug to the power supply. Complete the test according to the instructions of the test host.

[0012] This utility model integrates the circuit control section, pressure testing section, and instrument interface section, achieving a high degree of integration and making it more portable and convenient to use. Furthermore, the main body of the testing device is made of rigid polyurethane plastic and equipped with a protective transparent cover, effectively improving safety during testing. The technical solution proposed in this utility model establishes for the first time an automatic testing device for the fuel electromagnetic valve of the 131-9B model auxiliary power unit, which has high promotional value in this field. Attached Figure Description

[0013] Figure 1 This is the main view of the utility model;

[0014] Figure 2This is a front view of the present invention after the protective transparent cover has been installed;

[0015] Figure 3 This is a schematic diagram showing the connection between the plug of this utility model and the fuel solenoid valve;

[0016] Figure 4 This is a schematic diagram showing the connection between plug one, plug two and the serial port relay of this utility model.

[0017] In the diagram: A. Box body; B. Plug 1; C. Serial port relay; D. Plug 2; E. Power plug; F. Flow meter; G. Valve fixing fixture; H. Fixing screw; I. Protective transparent cover; J. Perforation. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] See Figure 1-4 A portable auxiliary power unit fuel electromagnetic valve testing device includes a housing A made of rigid polyurethane plastic, which, while ensuring structural strength, reduces weight compared to metal, making it easier to carry, and also provides stronger insulation and greater safety. A serial port relay C is installed inside the housing A. The front side of the housing A has a first plug B, a second plug D, and a power plug E, which connects to the serial port relay C. A flow meter F and a valve fixing fixture G are installed on the upper surface of the housing A. During testing of the fuel electromagnetic valve, the fuel electromagnetic valve is first installed on the valve fixing fixture G. Then, the fuel supply return pipe is connected to the fuel outlet of the fuel electromagnetic valve via the flow meter F, and the fuel supply pipe is connected to the fuel inlet of the fuel electromagnetic valve. A protective transparent cover I is also installed on the upper end of the housing A via fixing screws H, facilitating the removal of the protective transparent cover I. A through hole J is provided at the front end of the protective transparent cover I to facilitate the insertion of fuel lines and wires.

[0020] The plug-B is connected to the electrical plug of the fuel solenoid valve fixed on the valve fixing fixture G via a wire harness. Pins 1 and 2 of the plug-B are connected to the electrical plug of the fuel solenoid valve via a wire harness, and pin 3 of the plug-B is connected to the housing of the fuel solenoid valve via a wire harness. The wire harness is connected to the housing of the fuel solenoid valve via a circular connector.

[0021] The wires leading out from plug B are connected to serial port relay C. Pin 1 of plug B is connected to the normally open control terminals of serial port relay C (pins 1, 3, and 5). Pin 2 of plug B is connected to the normally open control terminals of serial port relay C (pins 2, 4, and 6). Pin 3 of plug B is connected to the normally open control terminal of serial port relay C (pin 7).

[0022] The common terminal of the serial relay C is connected to plug D, which is connected to the test host. The common hole of the control terminals 1 and 2 of the serial relay C is connected to pin 1 of plug D. The common hole of the control terminal 3 of the serial relay C is connected to pin 3 of plug D. The common hole of the control terminal 4 of the serial relay C is connected to pin 4 of plug D. The common hole of the control terminal 5 of the serial relay C is connected to pin 5 of plug D. The common hole of the control terminal 6 of the serial relay C is connected to pin 6 of plug D. The common hole of the control terminal 7 of the serial relay C is connected to pin 2 of plug D.

[0023] Working principle: When testing the fuel solenoid valve, first install the fuel solenoid valve on the valve fixing fixture G, then connect the fuel supply return pipe to the fuel outlet of the fuel solenoid valve via the flow meter F, and connect the fuel supply pipe to the fuel inlet of the fuel solenoid valve; then connect plug one B to the electrical plug of the fuel solenoid valve fixed on the valve fixing fixture G via the wire harness, connect plug two D to the test host, and connect the power plug E to the power supply. The test is completed according to the instructions of the test host.

[0024] Testing process and pass / fail criteria:

[0025] (1) Test 1 - Insulation Resistance Test

[0026] Pins 1 and 2 of the fuel solenoid valve and its housing are connected to relays 1, 2, and 7 of serial port relay C, respectively. After the relays are closed, the outputs of relays 1 and 2 are connected together and then connected to the positive terminal of the megohmmeter on the test host via connector D. The output of relay 7 of serial port relay C is connected to the negative terminal of the megohmmeter on the test host via connector D. At the start of the test, the test host obtains the insulation resistance value through the megohmmeter. If the resistance value is greater than 100 MΩ, the test passes.

[0027] (2) Test 2 - Loop Resistance Test

[0028] Pins 1 and 2 of the fuel solenoid valve are connected to relays 3 and 4 in serial port relay C, respectively. After the relays are closed, the output terminals of relays 3 and 4 are connected to the positive and negative terminals of the multimeter in the test host via connector D. The test begins, and the test host obtains the resistance value using the multimeter. The test passes when the resistance value is within the range of 26-33 ohms.

[0029] (3) Test 3 - Driver Test

[0030] Pins 1 and 2 of the fuel solenoid valve are connected to relays 5 and 6 in serial relay C, respectively. After the relays are closed, the output terminals of relays 5 and 6 are connected to the positive and negative terminals of the DC power supply in the test host via connector D. When the DC power supply voltage is at its maximum of 30V, the fuel solenoid valve does not operate and remains in the open position.

[0031] (4) Test 4 - Drive pressure test

[0032] The circuit connection is consistent with test 3 - drive test. Connect a hydraulic pressure pipe to the inlet end of the fuel solenoid valve, and supply a pressure of 669-710 kPa using a hydraulic power source. Simultaneously, the test host controls the DC power supply to gradually increase the current until the solenoid valve closes. The test passes when the current is no greater than 0.26 amps.

[0033] The hydraulic power source was repeatedly used to supply a pressure of 2048–2089 kPa, while the main unit controlled the DC power supply to gradually increase the current until the electromagnetic valve closed. The test passed when the current did not exceed 0.29 amps.

[0034] Based on the previous test, reduce the voltage until the electromagnetic valve opens. The test passes when the voltage does not exceed 4VDC.

[0035] (5) Test 5 - Leakage Test

[0036] Connect a hydraulic pressure pipe to the inlet end of the fuel solenoid valve and supply a pressure of 10273-10411 kPa using a hydraulic power source. If there is no leakage within 3 minutes, the test is passed.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A portable auxiliary power unit fuel electromagnetic valve testing device, comprising a housing A, characterized in that: The housing A is equipped with a serial port relay C. The front side of the housing A is equipped with plug B, plug D and power plug E. The power plug E is connected to the serial port relay C. The upper surface of the housing A is equipped with a flow meter F and a valve fixing fixture G. The upper end of the housing A is also equipped with a protective transparent cover I by fixing screws H. The plug B is connected to the electrical plug of the fuel solenoid valve fixed on the valve fixing fixture G via a wire harness. The No. 1 and No. 2 pins of the plug B are connected to the electrical plug of the fuel solenoid valve via a wire harness, and the No. 3 pin of the plug B is connected to the housing of the fuel solenoid valve via a wire harness. The wires leading out from the plug B are connected to the serial port relay C. Pin 1 of the plug B is connected to the normally open control holes of relays 1, 3, and 5 of the serial port relay C. Pin 2 of the plug B is connected to the normally open control holes of relays 2, 4, and 6 of the serial port relay C. Pin 3 of the plug B is connected to the normally open control hole of relay 7 of the serial port relay C. The common terminal of the serial relay C is connected to plug D. The common hole of the control terminals 1 and 2 of the serial relay C is connected to pin 1 of plug D. The common hole of the control terminal 3 of the serial relay C is connected to pin 3 of plug D. The common hole of the control terminal 4 of the serial relay C is connected to pin 4 of plug D. The common hole of the control terminal 5 of the serial relay C is connected to pin 5 of plug D. The common hole of the control terminal 6 of the serial relay C is connected to pin 6 of plug D. The common hole of the control terminal 7 of the serial relay C is connected to pin 2 of plug D.

2. The portable auxiliary power unit fuel electromagnetic valve testing device according to claim 1, characterized in that: The front end of the protective transparent cover I has a perforation J.

3. The portable auxiliary power unit fuel electromagnetic valve testing device according to claim 1, characterized in that: The housing A is made of rigid polyurethane plastic.

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