A reliability test system for gas turbine air solenoid valves

Abstract

A gas turbine air solenoid valve reliability test system includes a compressed air cylinder, a precision filter, a stop valve, a ball valve A, a ball valve B, a ball valve C, an accumulator, a gas pressure reducing valve, and an air solenoid valve; the compressed air cylinder gas line is connected to the precision filter; the stop valve is connected to the precision filter and is used to open or close when replacing the compressed air cylinder; the ball valve A is used to control the discharge of high-pressure gas in the accumulator when the test is completed; the ball valve B and the ball valve C are used to control the inlet and outlet gas lines of the gas pressure reducing valve, respectively; the air solenoid valve is installed at the rear end of the gas pressure reducing valve. The present invention facilitates the movement of the test system with changes in the test site through the mobile frame design; the independent gas line design can meet the testing requirements of 5 solenoid valves; the accumulator design can ensure that the pressure is controlled within the safety limit, ensuring the safe use of the test system; the pressure sensor can intuitively display the pressure value of each input and output channel, facilitating test records and improving test efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of reliability testing of gas turbine accessories, and in particular relates to a reliability testing system for an air solenoid valve of a gas turbine. Background Art

[0002] Gas turbine electrical accessories consist of sensors, solenoid valves, and actuators installed on the gas turbine body and surrounding piping. These primarily include speed sensors, thermal resistors, metal chip sensors, pressure and differential pressure sensors, position sensors, solenoid valves, and plasma generators. The installation environment's temperature ranges from 0°C to a maximum of 800°C, with high-temperature gas flowing in some locations, along with vibration, heat, humidity, and electromagnetic influencing factors. The electrical accessories monitor the status of key gas turbine parameters in real time and receive electrical signals to initiate actions such as switching and ignition. The air solenoid valve controls the flow of air.

[0003] The development of electrical accessories is closely tied to gas turbines. After my country introduced shipboard gas turbine technology, it underwent a development process spanning over 20 years: installation and operation of imported units, three phases of domestic development, and equipment supply. Initially, electrical accessory technology was not introduced with the turbines, relying entirely on imports. Subsequently, development projects were initiated in batches, tailored to specific types. In the absence of design data, domestic manufacturers copied actual products based on actual equipment. China now possesses the capability to independently develop, produce, and test electrical accessories. The electrical accessories still in use include those from various stages of development, including imports, initial domestic development, and improvements. Failure statistics for electrical accessories during gas turbine testing and onboard operation show that sensors such as pressure sensors, solenoid valves, and RTDs have a high failure rate. Major faults include failure, unstable output, insulation failure, malfunction, insufficient accuracy, breakage of the main unit or cable, interference from noise, internal material spillage, and assembly or disassembly difficulties.

[0004] Gas turbine units are used in military equipment, and their reliability is crucial to the effectiveness of military missions. Failure of electrical accessories can directly lead to unit loss of control, loss of functionality, altered operating conditions, and even shutdown, jeopardizing stable operation. Therefore, reliability research on these accessories is crucial. Due to the high reliability requirements of gas turbine electrical accessories, the lengthy reliability testing time, and the stringent testing conditions, no domestic research organization has developed a reliable test system for gas turbine air solenoid valves. Summary of the Invention

[0005] The present invention aims to provide a gas turbine air solenoid valve reliability test system which solves the problems in the reliability test of gas turbine electrical accessories.

[0006] A gas turbine air solenoid valve reliability test system includes a compressed air cylinder, a precision filter, a stop valve, a ball valve A, a ball valve B, a ball valve C, an accumulator, a gas pressure reducing valve, and an air solenoid valve; the compressed air cylinder gas path is connected to the precision filter; the stop valve is connected to the precision filter and is used to open or close when replacing the compressed air cylinder; the ball valve A is used to control the discharge of high-pressure gas in the accumulator when the test is completed; the ball valve B and the ball valve C are used to control the inlet and outlet gas paths of the gas pressure reducing valve, respectively; and the air solenoid valve is installed at the rear end of the gas pressure reducing valve.

[0007] Furthermore, pressure gauges A and B are installed at the front and rear ends of the gas pressure reducing valve, respectively, and pressure gauges A and B display the high-pressure inlet pressure and the reduced-pressure output pressure, respectively.

[0008] Furthermore, the air solenoid valve is fixed on the mounting plate with screws, and the input end interface of each solenoid valve is connected to the input valve block through a connecting pipe, and the output end interface of each solenoid valve is connected to the output valve block through a flexible pipe. After the connection is completed, the solenoid valve and the valve block form an assembly, which is installed as a whole in the three-integrated test box.

[0009] Furthermore, there are five air solenoid valves, and air is supplied to the air solenoid valve to be tested from ports P1 to P5 through connecting hoses via solenoid valves A to E.

[0010] Furthermore, a test fixture is fixed in the three-comprehensive test box.

[0011] Furthermore, a pressure sensor and a pressure sensor are installed at the front and rear ends of the air solenoid valve respectively. The pressure sensor is used to display the air pressure at the input end of the tested air solenoid valve; the pressure sensor is used to monitor the air pressure output from the air solenoid valve pipeline to determine whether the air solenoid valve is opened normally.

[0012] Furthermore, the accumulator is equipped with a safety valve. When the pressure in the accumulator is greater than 6 MPa, the safety valve automatically opens and releases the pressure through the muffler.

[0013] The beneficial effects of the present invention are as follows: the present invention facilitates the movement of the test system as the test site changes through the mobile frame design; the independent air path design can meet the testing needs of 5 solenoid valves; the accumulator design can ensure that the pressure is controlled within the safety limit, ensuring the safe use of the test system; the pressure sensor can intuitively display the pressure value of each input and output channel, facilitate test records, improve test efficiency, and simplify the test process. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the present invention;

[0015] Figure 2 It is a three-dimensional diagram of the appearance of the present invention;

[0016] Figure 3 It is the front view of the present invention;

[0017] Figure 4 It is a top view of the present invention;

[0018] Figure 5 It is a left view of the present invention. DETAILED DESCRIPTION

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] like Figure 1 As shown, a gas turbine air solenoid valve reliability test system includes a compressed air cylinder 1, a precision filter 2, a stop valve 3, a ball valve A4.1, a ball valve B4.2, a ball valve C4.3, an accumulator 6, a gas pressure reducing valve 9, an air solenoid valve 10, and a pressure sensor 11; the air path of the compressed air cylinder 1 is connected to the precision filter 2, the compressed air cylinder 1 is used to provide air medium, with a volume of 40L and a pressure of 13MPa, and the precision filter 2 is used to filter particles, dust, oil and water in the compressed air; the stop valve 3 is connected to the precision filter 2, and the stop valve 3 is used to reduce the gas pressure in the compressed air cylinder 1 to the working pressure range of the air solenoid valve 0.02MPa~7MPa; the ball valve A4.1 is used to control the discharge of high-pressure gas in the accumulator 6 when the test is completed; the ball valve B4.2 and the ball valve C4.3 are used to control the inlet and outlet air paths of the gas pressure reducing valve 9 respectively; the air solenoid valve 10 is installed at the rear end of the gas pressure reducing valve 9.

[0021] The front and rear ends of the gas pressure reducing valve 9 are respectively installed with a pressure gauge A8.1 and a pressure gauge B8.2, which respectively display the high-pressure inlet pressure and the reduced-pressure output pressure.

[0022] The air solenoid valve 10 is fastened to the mounting plate with screws, and the input end interface of each solenoid valve is connected to the input valve block through a transfer pipe, and the output end interface of each solenoid valve is connected to the output valve block through a flexible pipe. After the connection is completed, the solenoid valve and the valve block form an assembly, which is installed as a whole in the three-integrated test box.

[0023] There are five air solenoid valves 10, which supply air to the air solenoid valve to be tested through solenoid valves A10.1 to E10.5 from ports P1 to P5 via connecting hoses.

[0024] A test fixture 12 is fixed in the three-comprehensive test box.

[0025] Pressure sensors A11.1 and B11.2 are installed at the front and rear ends of the air solenoid valve 10, respectively. Pressure sensor A11.1 displays the air pressure at the input of the air solenoid valve 10 under test; pressure sensor B11.2 monitors the air pressure at the output of the air solenoid valve 10 pipeline, determining whether the air solenoid valve is properly open. An accumulator 6 is connected to pressure sensor B11.2 to monitor internal pressure in real time. If pressure sensor B11.2 detects pressure, indicating the solenoid valve is open, disconnect the power supply to the air solenoid valve under test. If pressure sensor B11.2 fails to detect pressure within two seconds, indicating the solenoid valve is properly closed.

[0026] The accumulator 6 is equipped with a safety valve 7.2. When the pressure within the accumulator exceeds 6 MPa, the safety valve 7.2 automatically opens, releasing the pressure through the muffler 5. Once the test is complete, the exhaust ball valve A4.1 is opened, and the high-pressure air is discharged to the atmosphere through the muffler 5. When the pressure gauge indicates that the gas pressure in the cylinder is less than 10 MPa, the source cylinder must be replaced. To replace the high-pressure cylinder, first close the cylinder shutoff valve 3. Open the shutoff valve 3 to release the remaining high-pressure gas in the pipeline, and then perform a safe cylinder change.

[0027] The specific working process of this system is as follows:

[0028] See also Figure 1 As shown, the air solenoid valve test system provides a high-pressure gas source through a high-pressure air storage cylinder group, adjusts the pressure through a pressure reducing valve, connects the device under test through an interface pipe, applies pressure to the air solenoid valve, and when the inlet of the solenoid valve under test is pressurized, an external power supply is provided to realize the opening and closing actions, and the working performance of the air solenoid valve is collected and recorded by the electrical measurement system.

[0029] Compressed air cylinder 1 provides 13 MPa high-pressure air, which is filtered through precision filter 2 to remove fine particles from the compressed air, resulting in a clean compressed air source. The air source is fed through gas pressure reducing valve 9 to the solenoid valve under test. Ball valves B4.2 and C4.3 control the inlet and outlet of the pressure reducing valve, respectively. Pressure gauges A8.1 and B8.2 display the high-pressure inlet pressure and the reduced-pressure output pressure, respectively. Pressure sensor A11.1 accurately displays the reduced-pressure output air pressure. The reduced-pressure output high-pressure air passes through solenoid valves A10.1 to E10.5, and is supplied from ports P1 to P5 through connecting hoses to the solenoid valve under test.

[0030] During the on / off function test of the air solenoid valves, each valve must be operated individually. A single air solenoid valve under test is fixed in a three-comprehensive reliability test chamber using test fixture 12. After air solenoid valve 10 is powered on, high-pressure gas is output from the air solenoid valve under test, entering the 0.23L accumulator 6 through port T1 and the connecting hose. At this point, pressure sensor B11.2 measures pressure, indicating that the solenoid valve is normally open. Disconnect the power to the air solenoid valve under test. Within two seconds, pressure sensor B11.2 will no longer measure pressure, indicating that the solenoid valve is normally closed.

[0031] The on-off test of air solenoid valves must be performed one by one. Take the on-off test of a single air solenoid valve under test as an example. Ball valve C4.3 is opened, solenoid valve A10.1 is opened, and solenoid valves B10.2 to E10.5 are closed. After the air solenoid valve under test is powered on, the air solenoid valve under test is connected, and compressed air is output through the air solenoid valve under test. The pressure measured by pressure sensor A11.1 is consistent with the intake pressure, indicating that the air solenoid valve under test is normally open. The power to the air solenoid valve under test is then cut off, and the air solenoid valve under test is closed. Within two seconds, the pressure measured by pressure sensor A11.1 is zero, indicating that the air solenoid valve under test is normally closed. Repeat this process, testing the air solenoid valves under test one by one.

[0032] Accumulator 6 is designed with a safety valve 7.1. When the pressure within the accumulator exceeds 6 MPa, safety valve 7.1 automatically opens, muffles the sound through muffler 5, and releases the pressure. After the test is complete, open ball valve 4.1, and the high-pressure air is discharged to the atmosphere through muffler 5. When the gas source pressure in the cylinder indicated by pressure gauge A8.1 falls below 10 MPa, the source cylinder must be replaced. When replacing the high-pressure source cylinder, first close the shutoff valve on the cylinder itself, open shutoff valve 3, and release the remaining high-pressure gas in the pipeline before performing a safe cylinder change.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gas turbine air solenoid valve reliability test system, characterized in that: The invention comprises a compressed air cylinder (1), a precision filter (2), a stop valve (3), a ball valve A (4.1), a ball valve B (4.2), a ball valve C (4.3), an accumulator (6), a gas pressure reducing valve (9), and an air solenoid valve (10); the compressed air cylinder (1) gas path is connected to the precision filter (2); the stop valve (3) is connected to the precision filter (2) and is used to open or close when replacing the compressed air cylinder (1); the ball valve A (4.1) is used to control the discharge of high-pressure gas in the accumulator (6) when the test is completed; the ball valve B (4.2) and the ball valve C (4.3) are used to control the inlet and outlet gas paths of the gas pressure reducing valve (9) respectively; and the air solenoid valve (10) is installed at the rear end of the gas pressure reducing valve (9); The air solenoid valve (10) is fastened to the mounting plate with screws, and the input end interface of each solenoid valve is connected to the input valve block through a transfer pipe, and the output end interface of each solenoid valve is connected to the output valve block through a flexible pipe. After the connection is completed, the solenoid valve and the valve block form an assembly, which is installed as a whole in the three-comprehensive test box; The front end and rear end of the air solenoid valve (10) are respectively equipped with a pressure sensor A (11.1) and a pressure sensor B (11.2). The pressure sensor A (11.1) is used to display the air pressure at the input end of the air solenoid valve (10) being tested; the pressure sensor B (11.2) is used to monitor the air pressure output from the pipeline of the air solenoid valve (10) and determine whether the air solenoid valve is normally opened.

2. A gas turbine air solenoid valve reliability test system according to claim 1, characterized in that: The front and rear ends of the gas pressure reducing valve (9) are respectively installed with a pressure gauge A (8.1) and a pressure gauge B (8.2), and the pressure gauge A (8.1) and the pressure gauge B (8.2) respectively display the high-pressure inlet pressure and the reduced-pressure output pressure.

3. A gas turbine air solenoid valve reliability test system according to claim 1, characterized in that: Five air solenoid valves (10) are provided, and air is supplied to the air solenoid valve to be tested from ports P1 to P5 through connecting hoses via solenoid valves A (10.1) to E (10.5).

4. A gas turbine air solenoid valve reliability test system according to claim 3, characterized in that: A test fixture (12) is fixed in the three-comprehensive test box.

5. A gas turbine air solenoid valve reliability test system according to claim 1, characterized in that: The accumulator (6) is equipped with a safety valve (7.2). When the pressure in the accumulator is greater than 6 MPa, the safety valve (7.2) automatically opens and releases the pressure through the muffler (5).

6. A gas turbine air solenoid valve reliability test system according to claim 5, characterized in that: When the pressure gauge shows that the gas source pressure in the gas cylinder is lower than 10MPa, the gas source cylinder needs to be replaced. When replacing the gas source high-pressure gas cylinder, first close the gas cylinder body stop valve (3), open the stop valve (3), discharge the high-pressure residual gas in the pipeline, and then perform a safe bottle replacement operation.

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