A test device and method for simulating steam leakage defects at the end of a steam turbine cylinder

Abstract

The present application provides a test device and method for simulating steam leakage defects at the end of a steam turbine cylinder. The test device for simulating steam leakage defects at the end of a steam turbine includes a lower half of the test device, an upper half of the test device, a sealing strip, an oil pipe, a positioning member and a connecting member. The oil pipe is installed on the upper half of the test device and is used to connect to the oil pipe outlet of the pressure pump. The positioning member is arranged on the lower half of the test device and is used to align the positions of the upper half of the test device with the lower half of the test device. The connecting member is used to connect the lower half of the test device and the upper half of the test device. A center-dividing surface sealing groove for placing the sealing strip is provided on one side of the lower half of the test device facing the upper half of the test device. A sealing device installation groove for placing a metal seal is also provided on one side of the lower half of the test device facing the upper half of the test device. The present application divides the test device into upper and lower halves by considering the structural characteristics of the center-dividing surface of the cylinder to solve the problem of how to test the sealing effect of a metal seal or a pressure plugging device.

Description

Technical Field

[0001] The present application belongs to the technical field of steam turbines, and in particular relates to a test device and method for simulating steam leakage defects at the cylinder end of a steam turbine. Background Art

[0002] During the long-term service of the steam turbine, the entire cylinder is subjected to high-temperature and high-pressure steam, and the operating conditions are harsh. The cylinder will produce thermal deformation during long-term operation, and the upper and lower cylinder center surfaces of the cylinder may even partially separate, eventually leading to steam leakage. There are two main methods to improve the sealing characteristics of the cylinder center surface of commercial steam turbines. One method is to process grooves and add metal seals at the separation position of the cylinder center surface, and the other method is to install a pressurized plugging device on the outside of the cylinder steam leakage position. Both methods involve mechanical processing and modification of the cylinder itself. At the same time, affected by the maintenance rules of commercial steam turbines, it is generally required that the metal seals or pressurized plugging devices be installed successfully once and ensure the sealing performance of the device. It can be seen that the sealing effect of metal seals or pressurized plugging devices is particularly important. Accordingly, how to test the sealing effect of metal seals or pressurized plugging devices has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] In view of this, in order to test the sealing effect of metal seals or pressurized leak-proof devices, so that maintenance personnel can have a definite understanding of the performance of the sealing device before installation and use, the present application is committed to providing a test device and method for simulating steam leakage defects at the end of a turbine cylinder. By considering the structural characteristics of the split surface in the cylinder, the test device is divided into an upper and lower halves to solve the problem of how to test the sealing effect of metal seals or pressurized leak-proof devices.

[0004] In a first aspect, the present application provides a test device for simulating steam leakage defects at the end of a steam turbine, and the test device for simulating steam leakage defects at the end of a steam turbine comprises a lower half of the test device, an upper half of the test device, a sealing strip, an oil pipe, at least one positioning member and at least one connecting member. The oil pipe is installed on the upper half of the test device and is used to connect to the oil pipe outlet of the pressure pump. At least one positioning member is arranged on the lower half of the test device and is used to align the positions of the upper half of the test device with the lower half of the test device. At least one connecting member is used to connect the lower half of the test device and the upper half of the test device. A center-dividing surface sealing groove is provided on one side of the lower half of the test device facing the upper half of the test device, and the center-dividing surface sealing groove is used to place the sealing strip. A sealing device installation groove is also provided on one side of the lower half of the test device facing the upper half of the test device, and the sealing device installation groove is used to place a metal seal.

[0005] In a specific embodiment of the present application, at least one positioning member is fixedly disposed on the upper half and / or the lower half of the test device.

[0006] In a specific embodiment of the present application, at least one positioning member is detachably mounted on the upper half of the test device and / or the lower half of the test device.

[0007] In a specific embodiment of the present application, at least one positioning member includes a first positioning pin and a second positioning pin. The first positioning pin hole and the second positioning pin hole are provided on the upper half and the lower half of the test device. The first positioning pin is used to be installed in the first positioning pin hole. The second positioning pin is used to be installed in the second positioning pin hole.

[0008] In a specific embodiment of the present application, at least one connecting member includes a first connecting bolt, a second connecting bolt and a third connecting bolt. The first bolt hole, the second bolt hole and the third bolt hole are provided on the upper half and the lower half of the test device. The first connecting bolt is used to be installed in the first bolt hole. The second connecting bolt is used to be installed in the second bolt hole. The third connecting bolt is used to be installed in the third bolt hole.

[0009] The second aspect of the present application provides a test method for simulating steam leakage defects at the end of a steam turbine. The test method for simulating steam leakage defects at the end of a steam turbine is implemented using a test device for simulating steam leakage defects at the end of a steam turbine provided by the first aspect of the present application.

[0010] In a specific embodiment of the present application, when the test device for simulating steam leakage defects at the end of a steam turbine tests the sealing performance of the pressure plugging device at the end of a steam turbine cylinder, the test method for simulating steam leakage defects at the end of a steam turbine includes:

[0011] Step 1: Place the lower half of the test device with the center facing upwards, and place the sealing strip into the sealing groove of the center facing surface of the lower half of the test device. The leakage simulation area of ​​the test device can be limited to the area surrounded by the sealing strip. Use at least one positioning piece to hoist the upper half of the test device to the installation position, and use at least one connecting piece to connect the lower half of the test device and the upper half of the test device. Install the oil pipe to the upper half of the test device.

[0012] Step 2: Install the pressure plugging device at the cylinder end of the device under test to the junction position of the middle dividing surface between the lower half and the upper half of the test device.

[0013] Step 3: Connect the oil pipe outlet of the pressure pump to the oil pipe in the test device, and perform pressure pumping after installation. The oil filling hole of the oil pipe in the upper half of the test device is a through hole. After the pressure pump is pressurized, the oil enters the center surface of the test device through the oil pipe. Oil pressure is formed at the edge of the center surface in the center of the test device without the sealing effect of the sealing strip, simulating the pressure generated by the steam leakage defect in the turbine cylinder. Use the pressure pump to continuously pressurize the test device until the sealing effect of the cylinder end pressure plugging device fails. At this time, the pressure indication number of the pressure pump is the sealing performance limit of the cylinder end pressure plugging device.

[0014] In a specific embodiment of the present application, the test method for simulating steam leakage defects at the end of a steam turbine further includes:

[0015] Step 4: According to the design pressure value of the cylinder end pressure plugging device, increase the pressure of the pressure pump to the design pressure value and then start timing to test the pressure holding time of the pressure plugging device.

[0016] In a specific embodiment of the present application, when the test device for simulating steam leakage defects at the end of a steam turbine is used to test the sealing performance of a faceted metal seal in a steam turbine cylinder, the test method for simulating steam leakage defects at the end of a steam turbine includes:

[0017] S1. Place the lower half of the test device with the center surface facing upward, and place the sealing strip into the sealing groove of the center surface of the lower half of the test device. Place the metal seal into the seal installation groove on the center surface of the lower half of the test device. At the same time, fill and seal the other parts of the seal installation groove with a rectangular cross-section rubber strip according to the size specifications of the metal seal, and apply cylinder sealing grease to the joint between the two. Use at least one positioning piece to hoist the upper half of the test device to the installation position, and use at least one connecting piece to connect the lower half of the test device and the upper half of the test device. Install the oil pipe to the upper half of the test device.

[0018] S2. Connect the oil pipe outlet of the pressure pump to the oil pipe in the test device and perform pressure pumping after installation. Use the pressure pump to continuously pressurize the test device until the sealing effect of the metal seal fails. At this time, the pressure reading of the pressure pump is the sealing performance limit of the metal seal.

[0019] In a specific embodiment of the present application, the test method for simulating steam leakage defects at the end of a steam turbine further includes:

[0020] S3. According to the design pressure value of the metal seal, the pressure of the pressure pump is increased to the design pressure value and then the timing is started to test the pressure holding time of the metal seal.

[0021] The beneficial effect of the technical solution of the present application is that: according to the outer dimensions of the end of the turbine cylinder, the turbine cylinder body and the external shaft seal and other components are regarded as a whole, and only the structural characteristics of the center surface of the cylinder are considered to divide the device into upper and lower halves. The center surface of the test device is filled with oil and pressurized by a pressure pump to simulate the steam leakage defect at the end of the cylinder, so that the sealing performance of the metal seals on the center surface of various types of cylinders and the sealing performance of the pressurized plugging device at the end of the cylinder can be tested, so as to achieve the performance characteristics of the tested sealing device to plug the steam leakage at the end of the turbine before installation. According to the design principle of metal seals, the test device is grooved and metal seals are installed to test the sealing performance of the metal seals, or a pressurized plugging device is installed outside the simulated steam leakage defect position of the device to test the sealing performance of the pressurized plugging device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure shows a schematic diagram of the use status of a test device for simulating steam leakage defects at the end of a steam turbine provided by an embodiment of the present application.

[0023] Figure 2A Shown is a schematic structural diagram of a test device for simulating steam leakage defects at the end of a steam turbine provided in one embodiment of the present application.

[0024] Figure 2B Shown Figure 2A An explosion diagram of a test device for simulating steam leakage defects at the end of a steam turbine is shown.

[0025] Figure 3A Shown is a schematic diagram of the three-dimensional structure of the lower half of a test device for simulating steam leakage defects at the end of a steam turbine provided in one embodiment of the present application.

[0026] Figure 3B Shown Figure 3A The schematic diagram of the top view of the lower half of a test device for simulating steam leakage defects at the end of a steam turbine is shown.

[0027] Figure 4A Shown is a three-dimensional schematic diagram of a cylinder end pressure plugging device provided by an embodiment of the present application during installation.

[0028] Figure 4B Shown Figure 4A The diagram shown is a front view of a cylinder end pressure plugging device during installation.

[0029] Figure 4C Shown Figure 4A A side view schematic diagram of a cylinder end pressure plugging device during installation is shown.

[0030] Figure 4D Shown Figure 4A The diagram shown is a top view of a cylinder end pressure plugging device during installation.

[0031] Figure 5A Shown is a schematic diagram of the three-dimensional structure of a metal seal during installation provided by an embodiment of the present application.

[0032] Figure 5B Shown Figure 5A An exploded view of a metal seal during installation is shown.

[0033] In the figure, A, test device; B, tested sealing device; C, pressure pump; 1, lower half of test device; 2, upper half of test device; 3, sealing rubber strip; 4, oil pipe; 5, first locating pin; 6, second locating pin; 7, first connecting bolt; 8, second connecting bolt; 9, third connecting bolt; 10, cylinder end pressure plugging device; 11, metal seal; 12, rectangular section rubber strip; 1.1, metal seal device installation groove; 1.2, center dividing surface sealing groove; 1.3, first bolt hole; 1.4, first locating pin hole; 1.5, second bolt hole; 1.6, second locating pin hole; 1.7, third bolt hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] At least one embodiment of the present application provides a test device for simulating steam leakage defects at the end of a steam turbine, and the test device A for simulating steam leakage defects at the end of a steam turbine comprises a test device lower half 1, a test device upper half 2, a sealing strip 3, an oil pipe 4, at least one positioning member and at least one connecting member. The oil pipe 4 is installed on the test device upper half 2, and is used to connect with the oil pipe outlet of the pressure pump C. At least one positioning member is arranged on the test device lower half 1, and is used to align the positions of the test device upper half 2 and the test device lower half 1. At least one connecting member is used to connect the test device lower half 1 and the test device upper half 2. A center-dividing surface sealing groove 1.2 is provided on the side of the test device lower half 1 facing the test device upper half 2, and the center-dividing surface sealing groove 1.2 is used to place the sealing strip 3. A sealing device installation groove 1.1 is also provided on the side of the test device lower half 1 facing the test device upper half 2, and the sealing device installation groove 1.1 is used to place the metal seal 11.

[0036] According to the technical solution provided in the embodiment of the present application, the turbine cylinder body and external shaft seal and other components are regarded as a whole according to the external dimensions of the turbine cylinder end, and the device is divided into upper and lower halves only by considering the structural characteristics of the center surface of the cylinder. The center surface of the test device A is filled with oil and pressurized by a pressure pump C to simulate the steam leakage defect at the end of the cylinder, so that the sealing performance of the metal seals on the center surface of various types of cylinders and the sealing performance of the pressure plugging device at the end of the cylinder can be tested, so as to achieve the performance characteristics of the sealing device B to plug the steam leakage at the end of the turbine before installation. According to the design principle of metal seals, the test device A is grooved and metal seals are installed to test the sealing performance of the metal seals, or a pressure plugging device is installed outside the simulated steam leakage defect position of the device to test the sealing performance of the pressure plugging device.

[0037] When used, the embodiment of the present application can firstly perform mechanical processing and modification on the test device A itself according to the design principle of the tested sealing device B without directly changing the original structure of the turbine cylinder body, such as: slotting the center dividing surface of the present application to install the center dividing surface metal seal, welding the pressure plugging device to the steam leakage position of the present application, or directly installing and testing the elastic pressure plugging device. The embodiment of the present application realizes that before installing the tested sealing device B when the center dividing surface steam leakage defect of the cylinder end of the commercial steam turbine is processed without directly changing the structure of the turbine cylinder body, the sealing performance of various forms of tested sealing devices B under the steam leakage defect conditions simulated by the present application is pre-tested, and the design parameters of the tested sealing device B are verified. According to the pressure data and test time of the pressure pump C, the embodiment of the present application can also be used to test the performance limits and pressure holding characteristics of various types of tested sealing devices B, such as the pressure resistance limit, to provide reference data for the design of various types of tested sealing devices B for optimizing the structure of various types of tested sealing devices B.

[0038] In addition, in order to ensure the safety of the test work and reduce the difficulty of the test, the embodiment of the present application changes the actual pressure medium water vapor in the turbine cylinder to oil for pressure testing, while also ensuring the accuracy of the test. The structure of the embodiment of the present application is simple and easy to process and produce. It can be processed and modified according to the design ideas of various types of tested sealing devices B to verify whether the turbine cylinder can meet the design requirements of various types of tested sealing devices B after the same modification. The preliminary demonstration work of the above-mentioned cylinder modification avoids ineffective damage to the core components of the turbine.

[0039] At least one positioning member is used to align the positions of the upper half 2 of the test device with the lower half 1 of the test device so that the upper half 2 of the test device can be hoisted to the installation position. On this basis, the embodiment of the present application does not specifically limit the number, setting position and setting method of at least one positioning member.

[0040] In at least one embodiment of the present application, at least one positioning member is fixedly disposed on the upper half 1 of the test device and / or the lower half 2 of the test device.

[0041] In at least one embodiment of the present application, at least one positioning member is detachably mounted on the upper half 1 of the test device and / or the lower half 2 of the test device.

[0042] In at least one embodiment of the present application, at least one positioning member includes a first positioning pin 5 and a second positioning pin 6. The first positioning pin hole 1.4 and the second positioning pin hole 1.6 are provided on the upper half 1 and the lower half 2 of the test device. The first positioning pin 5 is used to be installed in the first positioning pin hole 1.4. The second positioning pin 6 is used to be installed in the second positioning pin hole 1.6.

[0043] At least one connecting member is used to connect the lower half 1 of the test device and the upper half 2 of the test device. On this basis, the embodiment of the present application does not specifically limit the number and setting position of the at least one connecting member. For example, in at least one embodiment of the present application, at least one connecting member includes a first connecting bolt 7, a second connecting bolt 8 and a third connecting bolt 9. The upper half 1 of the test device and the lower half 2 of the test device are both provided with a first bolt hole 1.3, a second bolt hole 1.5 and a third bolt hole 1.7. The first connecting bolt 7 is used to be installed in the first bolt hole 1.3. The second connecting bolt 8 is used to be installed in the second bolt hole 1.5. The third connecting bolt 9 is used to be installed in the third bolt hole 1.7.

[0044] At least one embodiment of the present application further provides a test method for simulating steam leakage defects at the end of a steam turbine. The test method for simulating steam leakage defects at the end of a steam turbine is implemented using a test device for simulating steam leakage defects at the end of a steam turbine in the above-mentioned embodiment.

[0045] In at least one embodiment of the present application, when the test device for simulating steam leakage defects at the end of a steam turbine tests the sealing performance of the pressure plugging device at the end of a steam turbine cylinder, the test method for simulating steam leakage defects at the end of a steam turbine includes the following steps.

[0046] Step 1: Place the lower half 1 of the test device with the center surface facing upward, and place the sealing strip 3 into the sealing groove 1.2 of the center surface of the lower half 1 of the test device. The leakage simulation area of ​​the test device A can be limited to the area surrounded by the sealing strip 3. Use at least one positioning member to hoist the upper half 2 of the test device to the installation position, and use at least one connecting member to connect the lower half 1 of the test device and the upper half 2 of the test device. Install the oil pipe 4 to the upper half 2 of the test device.

[0047] For example, combining Figure 2A , Figure 2B , Figure 3A and Figure 3B Instructions: Place the lower half 1 of the test device with the center facing upward, and place the sealing strip 3 into the sealing groove 1.2 of the center facing surface of the lower half 1 of the test device. The leakage simulation area of ​​the test device A can be limited to the area surrounded by the sealing strip 3. Insert the first locating pin 5 and the second locating pin 6 into the second locating pin hole 1.6 and the first locating pin hole 1.4 of the lower half 1 of the test device, respectively. Lift the upper half 2 of the test device to the installation position according to the positions of the first locating pin 5 and the second locating pin 6, and use the first connecting bolt 7, the second connecting bolt 8 and the third connecting bolt 9 to connect the lower half 1 of the test device and the upper half 2 of the test device.

[0048] Step 2: Install the pressure plugging device 10 at the cylinder end of the device under test to the junction position of the middle dividing surface of the lower half 1 and the upper half 2 of the test device.

[0049] For example, combining 4A to 4D Note that the outer dimensions of the lower half 1 of the test device and the middle part of the upper half 2 of the test device are consistent with the outer dimensions of the steam leakage position at the end of the turbine cylinder.

[0050] Step 3, connect the oil pipe outlet of the pressure pump C to the oil pipe 4 in the test device, and perform pressure pumping after installation. The oil filling hole of the oil pipe in the upper half 2 of the test device is a through hole. After the pressure pump C is pressurized, the oil enters the center plane of the test device A through the oil pipe 4, and forms oil pressure at the edge of the center plane of the center part of the test device A without the sealing effect of the sealing strip 3, simulating the pressure generated by the steam leakage defect of the turbine cylinder. Use the pressure pump C to continuously pressurize the test device A until the sealing effect of the cylinder end pressure plugging device 10 fails. At this time, the pressure indication number of the pressure pump C is the sealing performance limit of the cylinder end pressure plugging device 10.

[0051] For example, step three can be combined with Figure 1 , 4A to 4D understand.

[0052] In at least one embodiment of the present application, the test method for simulating steam leakage defects at the end of a steam turbine further includes step four.

[0053] Step 4: According to the design pressure value of the cylinder end pressure plugging device 10, the pressure of the pressure pump C is increased to the design pressure value, and then the timing test of the pressure holding time of the pressure plugging device 10 is started.

[0054] In at least one embodiment of the present application, when the test device for simulating steam leakage defects at the end of a steam turbine is used to test the sealing performance of the faceted metal seal in the cylinder of a steam turbine, the test method for simulating steam leakage defects at the end of a steam turbine includes the following steps.

[0055] S1. Place the lower half 1 of the test device with the center surface facing up, and place the sealing strip 3 into the sealing groove 1.2 of the center surface of the lower half 1 of the test device. Place the metal seal 11 into the sealing device installation groove 1.1 on the center surface of the lower half 1 of the test device. At the same time, fill and seal the other parts of the sealing device installation groove 1.1 with a rectangular cross-section strip 12 according to the size specifications of the metal seal, and apply cylinder sealing grease to the joint between the two. Use at least one positioning piece to lift the upper half 2 of the test device to the installation position, and use at least one connecting piece to connect the lower half 1 of the test device and the upper half 2 of the test device. Install the oil pipe 4 to the upper half 2 of the test device.

[0056] The above S1 can be combined with Figure 2A , Figure 2B , Figure 3A , Figure 3B , Figure 5A and Figure 5BFor example, the first locating pin 5 and the second locating pin 6 are respectively inserted into the second locating pin hole 1.6 and the first locating pin hole 1.4 of the lower half 1 of the test device. The upper half 2 of the test device is hoisted to the installation position according to the positions of the first locating pin 5 and the second locating pin 6, and the lower half 1 of the test device and the upper half 2 of the test device are connected using the first connecting bolt 7, the second connecting bolt 8 and the third connecting bolt 9.

[0057] S2, connect the oil pipe outlet of the pressure pump C to the oil pipe 4 in the test device A, and perform pressure pumping after installation. Use the pressure pump C to continuously pressurize the test device A until the sealing effect of the metal seal 11 fails. At this time, the pressure indication number of the pressure pump C is the sealing performance limit of the metal seal 11.

[0058] In at least one embodiment of the present application, the test method for simulating steam leakage defects at the end of a steam turbine further includes S3.

[0059] S3. According to the design pressure value of the metal seal 11, the pressure of the pressure pump C is increased to the design pressure value, and then the pressure holding time of the metal seal 11 is started to be measured.

[0060] The above S2 and S3 can be combined Figure 1 and Figure 5 for understanding.

[0061] It should be noted that the combination of the various technical features in the embodiments of the present application is not limited to the combination described in the embodiments of the present application or the combination described in the specific embodiments, and all technical features described in the present application can be freely combined or combined in any way unless there is a contradiction between them.

[0062] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the term "comprising" only indicates that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0063] The terms "first", "second" and the like are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, features defined with "first", "second" and the like may explicitly or implicitly include one or more of the features.

[0064] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A test device for simulating steam leakage defects at the end of a steam turbine, characterized in that: It includes a lower half of the test device, an upper half of the test device, a sealing strip, an oil pipe, at least one positioning piece and at least one connecting piece. Among them, the oil pipe is installed on the upper half of the test device and is used to connect with the oil pipe outlet of the pressure pump; at least one positioning piece is arranged on the lower half of the test device and is used to align the position of the upper half of the test device with the lower half of the test device; at least one connecting piece is used to connect the lower half of the test device and the upper half of the test device; a center dividing surface sealing groove is provided on the side of the lower half of the test device facing the upper half of the test device, and the center dividing surface sealing groove is used to place the sealing strip; a sealing device installation groove is also provided on the side of the lower half of the test device facing the upper half of the test device, and the sealing device installation groove is used to place a metal seal.

2. A test device for simulating steam leakage defects at the end of a steam turbine according to claim 1, characterized in that: At least one positioning element is fixedly arranged on the upper half of the test device and / or the lower half of the test device.

3. A test device for simulating steam leakage defects at the end of a steam turbine according to claim 1, characterized in that: At least one positioning member is detachably mounted on the upper half of the test device and / or the lower half of the test device.

4. A test device for simulating steam leakage defects at the end of a steam turbine according to claim 3, characterized in that: At least one positioning member includes a first positioning pin and a second positioning pin. The upper half and the lower half of the test device are both provided with a first positioning pin hole and a second positioning pin hole. The first positioning pin is used to be installed in the first positioning pin hole, and the second positioning pin is used to be installed in the second positioning pin hole.

5. A test device for simulating steam leakage defects at the end of a steam turbine according to any one of claims 1 to 4, characterized in that: At least one connecting member includes a first connecting bolt, a second connecting bolt and a third connecting bolt. The upper half and the lower half of the test device are both provided with a first bolt hole, a second bolt hole and a third bolt hole. The first connecting bolt is used to be installed in the first bolt hole, the second connecting bolt is used to be installed in the second bolt hole, and the third connecting bolt is used to be installed in the third bolt hole.

6. A test method for simulating steam leakage defects at the end of a steam turbine, characterized in that: The test method for simulating steam leakage defects at the end of a steam turbine is implemented by using a test device for simulating steam leakage defects at the end of a steam turbine as described in any one of claims 1 to 5.

7. A test method for simulating steam leakage defects at the end of a steam turbine according to claim 6, characterized in that: When the sealing performance of the pressure plugging device at the end of the steam turbine cylinder is tested by using the test device for simulating the steam leakage defect at the end of the steam turbine, the test method for simulating the steam leakage defect at the end of the steam turbine comprises: Place the lower half of the test device with the center surface facing upward, put the sealing strip into the sealing groove of the center surface of the lower half of the test device, so that the leakage simulation area of ​​the test device can be limited to the area surrounded by the sealing strip, use at least one positioning member to hoist the upper half of the test device to the installation position, use at least one connecting member to connect the lower half of the test device and the upper half of the test device, and install the oil pipe to the upper half of the test device; Install the pressure plugging device at the end of the cylinder of the device under test to the junction of the middle dividing surface in the middle of the lower half and the upper half of the test device; Connect the oil pipe outlet of the pressure pump to the oil pipe in the test device and perform pressure pumping after installation. The oil filling hole of the oil pipe in the upper half of the test device is a through hole. After pressure pumping, the oil enters the center surface of the test device through the oil pipe. Oil pressure is formed at the edge of the center surface in the center of the test device where there is no sealing effect of the sealing strip, simulating the pressure caused by the steam leakage defect of the turbine cylinder. Use the pressure pump to continuously pressurize the test device until the sealing effect of the cylinder end pressure plugging device fails. At this time, the pressure indication number of the pressure pump is the sealing performance limit of the cylinder end pressure plugging device.

8. A test method for simulating steam leakage defects at the end of a steam turbine according to claim 7, characterized in that: Also includes: According to the design pressure value of the cylinder end pressure plugging device, the pressure of the pressure pump is increased to the design pressure value and then the timing test of the pressure holding time of the pressure plugging device is started.

9. A test method for simulating steam leakage defects at the end of a steam turbine according to claim 6, characterized in that: When the sealing performance of the faceted metal seal in the steam turbine cylinder is tested by using the test device for simulating the steam leakage defect at the end of the steam turbine, the test method for simulating the steam leakage defect at the end of the steam turbine comprises: Place the lower half of the test device with the center surface facing upward, put the sealing rubber strip into the sealing groove of the center surface of the lower half of the test device, put the metal seal into the sealing device installation groove on the center surface of the lower half of the test device, and at the same time, fill and seal the other parts of the sealing device installation groove with a rectangular cross-section rubber strip according to the size specifications of the metal seal, and apply cylinder sealing grease to the joint between the two, use at least one positioning piece to hoist the upper half of the test device to the installation position, and use at least one connecting piece to connect the lower half of the test device and the upper half of the test device, and install the oil pipe to the upper half of the test device; Connect the oil pipe outlet of the pressure pump to the oil pipe in the test device, and perform pressure pumping after installation. Use the pressure pump to continuously pressurize the test device until the sealing effect of the metal seal fails. At this time, the pressure indication number of the pressure pump is the sealing performance limit of the metal seal.

10. A test method for simulating steam leakage defects at the end of a steam turbine according to claim 9, characterized in that: Also includes: According to the design pressure value of the metal seal, the pressure of the pressure pump is increased to the design pressure value and then the timing is started to test the pressure holding time of the metal seal.

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