Hydrostatic test device for inclined swirler of heavy-duty gas turbine

Abstract

A hydrostatic test device for an inclined swirler of a heavy duty gas turbine comprises an annular base for containing the inclined swirler, two parallel sealing ring grooves are formed in the inner conical surface of the base, and rubber sealing rings matched with the sealing ring grooves are arranged in the sealing ring grooves. The two parallel sealing ring grooves and the rubber sealing ring enable the upper portion and the lower portion of a blade hole in the side face of the inclined cyclone to be tightly attached, the effect of sealing the blade hole can be achieved in the hydrostatic test, the device further comprises three to six pressing plates which are evenly distributed on the surface of a circle of the inclined cyclone, and the pressing plates press the inclined cyclone through bolts and locking nuts. A copper plate is arranged between the pressing plate and the end face of the inclined cyclone.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbine preparation and testing, and in particular to a water pressure test device and method for a gas turbine combustion chamber oblique swirler. Background Art

[0002] As a highly efficient, low-carbon energy conversion device, gas turbines have broad development prospects, driven by both energy transition and technological breakthroughs. Energy is the lifeblood of AI computing, and the development of artificial intelligence relies on energy support. The development of gas turbines can provide more power for AI.

[0003] The inclined cyclone is the core component of the gas turbine combustion chamber. Generally, the heavy-duty gas turbine combustion chamber is equipped with 24 sets of inclined cyclone devices. By generating a strong rotating airflow, it creates a stable high-temperature recirculation zone to anchor the flame, vigorously mixes the fuel and air to promote efficient and clean combustion, and organizes the air flow field at the head of the combustion chamber. Its performance directly determines the stability, efficiency, emission level and reliability of the combustion chamber. The inclined cyclone consists of three parts, namely the cone, the locking disk and the pipe. The cone and the locking disk are welded to the inner cavity flow channel. The pipe is welded to the locking disk and connected to the inner cavity flow channel. After the cone, the locking disk and the pipe are welded, three welds are formed. The quality of the welds determines the sealing, stability and safety of the inclined cyclone. The final structure of the inclined cyclone is a frustum, with a conical locking disk welded inside to form an inner cavity flow channel 15, and the inner cavity flow channel 15 is connected to the inner cavity flow channel 15. The inner cavity flow channel 15 is a rounded triangular annular cavity on the outer side of the upper end of the frustum, and is distributed with a number of blade holes. The vertical surface of the annular ring is nearly triangular, and the center of the frustum inclined cyclone 13 is a straight hole; the positioning boss 2 plugs the central straight hole of the workpiece. Function of the inclined cyclone: ​​The inclined cyclone body is welded by a cone (frustum) body, a locking disk and a connecting pipe. It is the core component of the gas turbine combustion chamber. It contains multiple groups of inclined swirl blade channels inside to form high-speed swirling air. It is necessary to ensure considerable strength and sealing. The weld quality of the inclined cyclone seriously affects the fuel mixing efficiency and combustion stability. A test pressure of 5-10M is required to ensure the bearing pressure test of the inclined cyclone.

[0004] Existing Problems: Traditional hydrostatic test equipment utilizes a flat flange for compression, which is unable to accommodate the asymmetric flow channel angle of the inclined cyclone. This results in uneven sealing pressure distribution, with localized pressure exceeding the design value, causing the seal to tear. Furthermore, nitrile rubber seals are susceptible to permanent deformation under high pressure (>10 MPa) and repeated use, leading to hydrostatic test failure and even a series of safety issues. When the seal fails, the high-pressure water jet can reach 80 m / s (equivalent to 288 km / h), causing a penetration accident at a testing site.

[0005] The core principle of plugging pressure measurement is to physically or chemically block the pressure measurement channel or pores, isolating them from external interference factors and creating a closed pressure conduction environment, thereby accurately measuring the target area. Elastic capsules, grouting materials such as polyurethane, or mechanical seals can be used to block the pores, as the test pressure is high. There have been reports of using epoxy or PU to seal a number of distributed blade pores, removing the seals after the test is complete. While PU plugging is technically feasible, it requires a deep plug to achieve high pressure resistance test conditions. Furthermore, removing the PU and cleaning the plug after the test is difficult. Using harder tools can compromise the accuracy of the pores, and once the PU material enters the cyclone cavity, it is difficult to clean. Each component has 20 blade pores. Summary of the Invention

[0006] To address these issues, the present invention provides a hydraulic pressure test device for heavy-duty gas turbine cyclones. This device secures the cyclone to a base fitted with a rubber seal using a pressure plate. A constant water pressure is applied through the water inlet and maintained. This system then inspects the sealability of the cyclone's welds and other components. This device offers high sealing performance and safety, reduces testing costs, and minimizes missed fault detection.

[0007] The technical solution of the present invention is to include an annular base 1 for accommodating the oblique cyclone, and two parallel sealing ring grooves 3 and 4 are provided on the inner conical surface of the base. A rubber sealing ring 3-1 that matches the ring groove is provided in the sealing ring groove. The two parallel sealing ring grooves and the rubber sealing ring tightly adhere to the upper and lower parts of the blade holes on the side of the oblique cyclone, and can seal the blade holes during a water pressure test. The base also includes a positioning boss 2, which is clearance-matched with the inner hole of the oblique cyclone. It also includes three to six pressure plates evenly distributed on the circular surface of the oblique cyclone. The pressure plate 6 presses the oblique cyclone 13 by means of a bolt 7 and a locking nut 5. A copper plate 8 or a flexible plate is provided between the pressure plate and the end face of the oblique cyclone to prevent the pressure plate from crushing the end face of the oblique cyclone.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] 1. The present invention provides a hydraulic pressure test device for a heavy-duty gas turbine inclined cyclone. The device can be operated simply by pressing the inclined cyclone with a pressing plate and installing a water injection pipe and a pressure gauge at the water injection port.

[0010] 2. This experimental device can withstand more than 50 kg of water pressure;

[0011] 3. The inclination angle of the base of this experimental device is consistent with that of the inclined cyclone to ensure the sealing during the pressure test;

[0012] 4. This experimental device is equipped with two sealing ring grooves to isolate the blade holes of the oblique cyclone from the inner cavity flow channel to form a separate pump water chamber;

[0013] 5. The arc structure of the inner cavity and the mouth of the sealing ring groove of this experimental device plays a role in protecting the sealing ring. It is suitable for batch experiments of inclined cyclones, greatly saving the experimental cycle and experimental costs, and has high safety.

[0014] 6. The base of this experimental device is equipped with a positioning boss. When the three pressure plates are fixing the oblique cyclone, the boss can play a centering role, preventing the oblique cyclone from tilting due to uneven force when the three pressure plates apply tightening force, which may cause the sealing ring to be not tightened in place and cause the sealing ring to tear under huge water pressure, causing a safety accident.

[0015] 7. This experimental device can effectively prevent the oblique cyclone from being damaged during the water pressure test. In particular, it can greatly improve the efficiency of the test. The test tooling is also simple and easy to make, the cost is not high, and the test process is safe and reliable. There will be no jet ejection causing safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] FIG2 is a block diagram of the present invention. Figure 1 The enlarged image at P in the middle; Figure 2A After sealing, Figure 2B Before sealing;

[0018] Figure 3 This is an enlarged view of the sealing ring groove of the present invention;

[0019] Figure 4 This is a diagram of the pump water seal state before the present invention;

[0020] Figure 5 This is a diagram showing the pump water sealing state of the present invention;

[0021] Figure 6 for Figure 1 A top view of

[0022] Figure 7 Schematic diagram of the oblique cyclone.

[0023] Figure 8 Schematic diagram of a full circle of blade holes (20). DETAILED DESCRIPTION

[0024] 1. Such as Figure 1 As shown, a positioning boss is provided in the center of the base, and the boss has a clearance fit with the inner hole; two parallel sealing ring grooves are also provided on the inclined surface of the base (see Figure 3 ), a rubber sealing ring is also provided in the sealing ring groove (see FIG2 ). The spacing between the two parallel sealing ring grooves is just enough to accommodate a circle of blade holes 14 of the oblique cyclone.

[0025] 2. Such as Figure 4 As shown, the inclined cyclone is embedded into the base along the axis of the boss, and the inclined cyclone is pressed by three pressure plates (see Figure 6 ) fixed to the base (see Figure 5 ), a copper gasket 8 is provided between the pressing plate and the inclined cyclone to prevent the end face of the inclined cyclone from being damaged during pressing.

[0026] 3. As shown in Figure 2, after the fixed cyclone, the rubber sealing ring is filled into the sealing ring groove to isolate the blade holes of the cyclone and the inner cavity flow channel into independent chambers.

[0027] 4. Such as Figure 5 As shown, fix the water pipe and pressure gauge at the water inlet 12-1 of the inclined cyclone, adjust the water pressure to 5MPa and maintain the pressure for 10 minutes, and observe whether the multiple welds 11 in the figure are leaking (see Figure 7 ).

[0028] Specific structure: Test device (tooling), heavy-duty gas turbine inclined cyclone water pressure test device, including a base 1, two parallel annular sealing ring grooves 3 and 4 are provided on the inner conical surface of the base, and the sealing ring grooves are both provided with arc chamfers. A rubber sealing ring 3-1 is provided in the sealing ring groove. 11 is the weld on the part and is the focus of the test. The cross-sectional area of ​​the sealing ring groove is the same as that of the rubber sealing ring. The rubber sealing ring isolates the inclined cyclone blade hole and the inner cavity flow channel into an independent chamber, which can play a sealing role during the water pressure test. The inner cavity and the mouth of the sealing ring groove are both provided with arc chamfers to prevent the rubber sealing ring from being crushed when the inclined cyclone is pressed. The rubber sealing ring is made of synthetic rubber such as butyl rubber and ternary rubber. The longitudinal cross-sectional area is larger than the longitudinal cross-sectional area of ​​the groove to ensure the elasticity of the sealing strip and thus ensure sealing; the base also includes a positioning boss 2, which is in clearance with the inner hole of the inclined cyclone. It also includes three (four to six) pressure plates evenly distributed on the circle. The pressure plate 6 is fixed to the cyclone 13 by bolts 7 (bolts with a diameter of 10-16 cm are preferred to ensure tensile strength during pressure testing) and locking nuts 5. A copper plate 8 is provided between the pressure plate and the end face of the cyclone to prevent the pressure plate from damaging the end face of the cyclone. The cone and the locking disk are welded to form an inner cavity flow channel 15. The blade holes 14 of the cyclone are connected to the inner cavity flow channel 15. The inner cavity flow channel 15 is an annular cavity with a rounded triangular cross-section on the outer side of the upper end of the truncated cone. The vertical cross-section of the annular shape is nearly triangular, and the center of the truncated cone cyclone 13 is a straight hole with a diameter of 12 cm. The positioning boss 2 blocks the central straight hole of the workpiece. It is this straight hole that has a positioning function. Without this positioning boss, if only three pressure plates are used to press, the part will tilt, resulting in the sealing ring not being pressed into place again, causing water leakage.

[0029] The maximum diameter of the oblique cyclone cone used in the embodiment is 25 cm, the diameter of the blade holes is about 1 cm, and the cross-sectional area of ​​the sealing ring groove is slightly smaller than the cross-sectional area of ​​the rubber sealing ring. There are 20 evenly distributed oblique cyclone blade holes 14 on the outer wall of the cone.

[0030] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. Heavy-duty gas turbine inclined cyclone hydraulic test device, characterized by: It includes an annular base for accommodating the oblique cyclone, and two parallel sealing ring grooves are provided on the inner conical surface of the base. A rubber sealing ring that matches the ring groove is provided in the sealing ring groove. The two parallel sealing ring grooves and the rubber sealing ring tightly fit the upper and lower parts of the blade holes on the side of the oblique cyclone, and can seal the blade holes during the water pressure test. It also includes three to six pressure plates evenly distributed on the circular surface of the oblique cyclone. The pressure plates press the oblique cyclone by bolts and locking nuts. A copper plate is provided between the pressure plate and the end face of the oblique cyclone.

2. The heavy-duty gas turbine inclined cyclone hydraulic test device according to claim 1, characterized in that: The sealing ring grooves are all provided with arc chamfers.

3. The heavy-duty gas turbine inclined cyclone hydraulic test device according to claim 1, characterized in that: The base further includes a positioning boss, and the positioning boss is clearance-matched with the inner hole of the oblique cyclone.

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