Gas turbine casing airtightness detection method

Abstract

The invention discloses a gas turbine casing airtightness detection method, and belongs to the technical field of gas turbine production. A gas turbine casing airtightness detection method comprises the following steps: step 1, when the surface temperature of a casing is 15-25 DEG C, plugging two ends of the casing and other pipeline ports, and sinking the casing into water; 2, filling gas with a certain pressure into the casing, waiting for a period of time, and observing whether the gas pressure in the casing is obviously reduced or not or whether bubbles are generated on the water surface or not; 3, taking out the product from the water, removing the water on the surface, and marking the surface of the product if the product leaks air; the purging plates are arranged on the inner walls of the two sides of the water tank, the nozzles are fixedly arranged on the purging plates, moisture on the surface of a product can be purged, moisture residues are reduced, the spraying pipes are arranged in the purging plates, and when air leaks from the product, marking liquid can be sprayed to the product, marking is achieved, and follow-up distinguishing is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbine production, and in particular to a method for detecting gas turbine casing air tightness. Background Art

[0002] The air intake and load-bearing casing of a gas turbine usually involve issues such as air bleed, load bearing, and connection methods with other components. For light and heavy-duty gas turbines, due to the lubrication of each bearing, the sealing of the bearing chamber, and the cooling of the hot end components, it is also necessary to arrange lubricating oil circuits and sealed gas pipelines on the casing. Generally speaking, the lubricating oil circuits and sealed gas pipelines on the casing are generally arranged inside the casing, using support plates or buried pipes that connect the inner and outer casings. In order to ensure the safety and stability of the gas turbine, the casing needs to be subjected to an airtightness test.

[0003] In the prior art, when testing the air tightness of a gas turbine casing, both ends are first sealed, then it is sunk into a water tank, and then air is inflated into the casing. A detection camera installed in the water tank is used to observe whether bubbles are generated, and an air tightness detector is used to determine whether the gas pressure in the casing changes, thereby achieving air tightness testing of the casing. However, after the test is completed, the residual water on the casing surface cannot be cleaned in time, and when a product leaks, the product cannot be marked in time, which affects the use effect. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the prior art that water on the casing surface cannot be cleaned in time and it is inconvenient to mark the product after it leaks, and to propose a gas turbine casing air tightness detection method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for detecting gas turbine casing air tightness comprises the following steps: Step 1: When the surface temperature of the casing is between 15℃ and 25℃, seal both ends of the casing and other pipe openings, and then sink it into water with a temperature of 15℃ to 25℃; Step 2: Fill the receiver with gas of a certain pressure, wait for a while, and observe whether the gas pressure in the receiver drops significantly or whether bubbles appear on the water surface; Step 3: When the gas pressure drops significantly or bubbles are generated, it is judged as a leak. Take it out of the water, clean the water on the surface, and then mark the surface of the product.

[0006] In order to facilitate the sealing, purging and marking of the product, preferably, a water tank is also included, a clamp plate is arranged in a lifting manner in the water tank, and sealing components for sealing the two ends of the casing are respectively arranged at both ends of the clamp plate, a purge plate is slidably arranged in the water tank, a plurality of groups of nozzles for purging the casing are fixedly arranged on the purge plate, and a nozzle for marking is fixedly arranged in the purge plate.

[0007] In order to facilitate the lifting and lowering of the product in the water tank, further, guide grooves are respectively opened at both ends of the water tank, and both ends of the clamp plate are respectively slidably set in the corresponding guide grooves, and a screw is rotatably set in one group of the guide grooves, one end of the clamp plate is threadedly connected to the screw, and a motor for driving the screw to rotate is fixed on the water tank.

[0008] In order to facilitate sealing of both ends of the product, the sealing assembly further includes a fixing seat fixedly arranged at both ends of the clamp plate, wherein a first piston cavity is opened in the fixing seat, a sealing plate is slidably arranged in the first piston cavity, a sealing gasket is fixedly arranged on the sealing plate, and an inflation tube for inflating air into the casing is opened on the sealing plate.

[0009] Furthermore, an airbag is arranged in the guide groove, an air inlet pipe is fixedly arranged at one end of the airbag, and an air outlet pipe connected to the first piston chamber is fixedly arranged at the other end of the airbag, a one-way valve is fixedly arranged on the air inlet pipe and the air outlet pipe, and an exhaust pipe is fixedly arranged on the air outlet pipe through a pressure reducing valve.

[0010] Furthermore, a support seat is provided on the fixture plate, a second piston cavity is opened in the fixture plate, a piston plate is slidably provided in the second piston cavity, the piston plate is fixedly connected to the support seat through a support column, and a first spring is sleeved on the support column, the two ends of the first spring are respectively against the fixture plate and the support seat, the second piston cavity is connected to the first piston cavity through a first pipe, a second pipe is fixedly provided on the second piston cavity, and a one-way valve is fixedly provided on both the first pipe and the second pipe.

[0011] Furthermore, limiting grooves are provided on the inner walls on both sides of the water tank, and two groups of purge plates are provided, which are respectively located on the inner walls on both sides of the water tank. A connecting plate is fixedly provided on the purge plate, and the connecting plate is slidably provided in the limiting groove, and a reciprocating screw is rotatably provided in the limiting groove, and the connecting plate is threadedly connected to the reciprocating screw.

[0012] Furthermore, a rotating chamber is opened in the water tank, a rotating shaft is rotatably arranged in the rotating chamber, a first vortex blade is fixedly arranged on the rotating shaft, the air inlet pipe passes through the rotating chamber and is connected with the outside of the water tank, and the rotating shaft is fixedly connected to the reciprocating screw.

[0013] Furthermore, a top plate is fixedly provided on the top of the clamp plate through a column, a mounting hole is opened on the top plate, an annular seat is rotatably provided in the mounting hole, a fixed shaft is provided in the annular seat, a plurality of groups of second vortex blades are fixedly provided between the annular seat and the fixed shaft, a first rod is fixedly provided on the fixed shaft, a second rod is fixedly provided at the bottom of the first rod, and a sphere is fixedly provided on the second rod through a second spring.

[0014] Furthermore, a storage bin is provided in the purge plate, the nozzle is connected with the storage bin, a slide groove is provided in the purge plate, a slider is slidably arranged in the slide groove, a push plate is fixedly provided at one end of the slider, a long strip is fixedly provided on the push plate, a cam is fixedly provided on the first rod, the long strip abuts against the cam, and a sliding plate is fixedly provided at the other end of the slider, the sliding plate passes through the nozzle, a through hole connected with the nozzle is provided on the sliding plate, a third spring is sleeved on the sliding plate, and both ends of the third spring abut against the slider and the slide groove respectively.

[0015] Compared with the prior art, the present invention provides a method for detecting gas turbine casing air tightness, which has the following beneficial effects: 1. The gas turbine casing air tightness detection method can purge the moisture on the surface of the product to reduce the residual moisture by arranging purge plates on the inner walls of both sides of the water tank and fixing nozzles on the purge plates, and the purge plates can reciprocate to increase the purge range and improve the use effect; 2. The gas turbine casing air tightness detection method is provided with a nozzle in the purge plate. When the product leaks, the marking liquid flows out from the nozzle and falls into the blowing groove. During the purge, the marking liquid can be sprayed onto the product to achieve marking, which is convenient for subsequent identification and improves production efficiency. Moreover, the marking liquid that falls into the blowing groove can be sprayed out from the nozzle at one time during the purge process to avoid residue in the blowing groove, thereby improving the use effect. 3. The gas turbine casing air tightness detection method is that during the product leakage process, the first rod rotates with the second rod, and the second rod can carry a ball to knock on the outer wall of the product. During the knocking process, bubbles at the leakage position of the product can be more easily ejected, which is convenient for the detection camera to find the leakage point and improve the use effect.

[0016] The parts not involved in the device are the same as the prior art or can be implemented by the prior art. The present invention arranges a purge plate on the inner walls of both sides of the water tank, and a nozzle is fixedly arranged on the purge plate to purge the moisture on the surface of the product to reduce residual moisture. A nozzle is arranged in the purge plate. When the product leaks, the marking liquid flows out from the nozzle and falls into the blowing groove. During the purge, the marking liquid can be sprayed onto the product to achieve marking, which is convenient for subsequent identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a gas turbine casing air tightness detection method proposed by the present invention; Figure 2 A schematic diagram of the structure of a purge plate of a gas turbine casing air tightness detection method proposed by the present invention; Figure 3 A cross-sectional view of a gas turbine casing air tightness detection method proposed by the present invention Figure 1 ; Figure 4 A cross-sectional view of a gas turbine casing air tightness detection method proposed by the present invention Figure 2 ; Figure 5 A gas turbine casing air tightness detection method proposed by the present invention Figure 4 A magnified view of part A; Figure 6 A schematic structural diagram of a fixing seat for a gas turbine casing air tightness detection method proposed by the present invention; Figure 7 A schematic diagram of the structure of a reciprocating screw in a gas turbine casing air tightness detection method proposed by the present invention; Figure 8 The present invention provides a schematic structural diagram of a sphere for detecting gas turbine casing air tightness.

[0018] In the figure: 1, water tank; 101, guide groove; 102, limit groove; 103, rotating chamber; 2, fixture plate; 201, support seat; 202, support column; 203, second piston chamber; 204, piston plate; 3, fixed seat; 301, first piston chamber; 4, sealing plate; 401, sealing pad; 402, inflation tube; 5, air bag; 501, air inlet pipe; 502, air outlet pipe; 503, exhaust pipe; 6, screw; 601, motor ; 7. Top plate; 701. Post; 702. Mounting hole; 8. Purge plate; 801. Nozzle; 802. Air blowing groove; 803. Storage bin; 804. Slide groove; 805. Connecting plate; 9. Reciprocating screw; 901. First vortex blade; 10. Ring seat; 11. First rod; 12. Second rod; 13. Sphere; 14. Nozzle; 15. Cam; 16. Push plate; 17. Sliding plate; 18. Through hole; 19. Long strip. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Example

[0021] A method for detecting gas turbine casing air tightness comprises the following steps: Step 1: When the surface temperature of the casing is between 15℃ and 25℃, seal both ends of the casing and other pipe openings, and then sink it into water with a temperature of 15℃ to 25℃; The product to be tested is placed on the support seat 201 on the fixture plate 2, and then the fixing seats 3 at both ends of the fixture plate 2, the sealing plates 4 and the sealing pads 401 on the two sets of fixing seats 3 can seal the two ends of the product respectively, one set of sealing plates 4 is provided with an inflation tube 402, and the fixture plate 2 is sunk into the water tank 1 with the product; Step 2: Fill the receiver with gas of a certain pressure, wait for a while, and observe whether the gas pressure in the receiver drops significantly or whether bubbles appear on the water surface; After the fixture plate 2 and the product are sunk into the water tank 1, a certain pressure of gas is charged into the product through the gas charging pipe 402, and after a period of time, it is observed whether the gas pressure in the product is significantly reduced or whether bubbles are generated in the water tank 1; Step 3: When the gas pressure drops significantly or bubbles are generated, it is judged as a leak. Take it out of the water, remove the water on the surface, and then mark the surface of the product; When the gas pressure does not drop significantly and no bubbles are generated, the product is leak-proof and rises from the water tank 1. The purge plate 8 slides with the nozzle 801 to purge the surface of the product. When the gas pressure drops significantly and there are bubbles, the product is leaking, the fixture plate 2 rises with the product, the nozzle 801 purges the product, and then the nozzle 14 sprays the marking liquid onto the product.

[0022] Reference Figure 1-Figure 3, a method for detecting air tightness of a gas turbine casing, further comprising a water tank 1, wherein a water inlet pipe and a water outlet pipe are fixedly arranged at one end of the water tank 1, and valves are fixedly arranged on the water inlet pipe and the water outlet pipe, respectively; a clamp plate 2 is arranged for lifting and lowering in the water tank 1, and sealing components for sealing the two ends of the casing are arranged at both ends of the clamp plate 2, respectively; a purge plate 8 is slidably arranged in the water tank 1, and the purge plate 8 is close to the top position of the water tank 1. When the product rises, the product can be purged to reduce the moisture on the surface of the product, and the moisture can be blown into the water tank 1 to prevent purging outside the water tank 1, resulting in water all over the ground, thereby improving the use effect; a plurality of groups of nozzles 801 for purging the casing are fixedly arranged on the purge plate 8, and the nozzles 801 are arranged in two to twenty groups, preferably thirteen groups; a blowing groove 802 is opened in the purge plate 8, and the plurality of groups of nozzles 801 are aligned with the blowing groove 8 02 is connected, and an air supply pipe connected to the blowing groove 802 is fixedly arranged on the blowing plate 8, and a nozzle 14 for marking is fixedly arranged in the blowing plate 8. When in use, by arranging the blowing plate 8 on the inner walls on both sides of the water tank 1, and fixing the nozzle 801 on the blowing plate 8, the moisture on the surface of the product can be purged to reduce the residual moisture, and the reciprocating sliding of the blowing plate 8 can increase the purging range and improve the use effect; by arranging the nozzle 14 in the blowing plate 8, when the product leaks, the marking liquid flows out from the nozzle 14 and falls into the blowing groove 802. During purging, the marking liquid can be sprayed onto the product to achieve marking, which is convenient for subsequent identification and improves production efficiency. Moreover, the marking liquid that falls into the blowing groove 802 can be sprayed out from the nozzle 801 at one time during the purging process to avoid residue in the blowing groove 802, thereby improving the use effect.

[0023] Reference Figure 3 Guide grooves 101 are respectively provided at both ends of the water tank 1, and the two ends of the clamp plate 2 are respectively slidably set in the corresponding guide grooves 101, and a screw rod 6 is rotatably set in one group of the guide grooves 101, and one end of the clamp plate 2 is threadedly connected to the screw rod 6, and a motor 601 for driving the screw rod 6 to rotate is fixed on the water tank 1. When in use, the motor 601 drives the screw rod 6 to rotate, and the clamp plate 2 can be driven to slide up and down along the guide groove 101 to realize the water test.

[0024] Reference Figure 3 and Figure 6Here, we design the sealing component as follows: a fixing seat 3 is fixedly provided at both ends of the fixture plate 2, wherein a first piston cavity 301 is opened in both sets of the fixing seats 3, a sealing plate 4 is slidably provided in the first piston cavity 301, a sealing gasket 401 is fixedly provided on the sealing plate 4, and an inflation tube 402 for inflating air into the casing is opened on the sealing plate 4. When in use, by placing the product on the fixture plate 2 and introducing gas into the first piston cavity 301, the sealing plate 4 and the sealing gasket 401 can be pushed toward the product, so that the sealing gasket 401 is respectively abutted against the end faces at both ends of the product, thereby achieving sealing of both ends of the product. After the product sinks into the water, a certain pressure of gas is introduced into the sealing cavity of the product through the inflation tube 402, thereby achieving air tightness detection of the product.

[0025] Reference Figure 3 and Figure 6 , airbags 5 are arranged in both sets of guide grooves 101, an air inlet pipe 501 is fixedly arranged on one end of the airbag 5, and an air outlet pipe 502 connected with the first piston chamber 301 is fixedly arranged on the other end of the airbag 5, and a one-way valve is fixedly arranged on the air inlet pipe 501 and the air outlet pipe 502, and an exhaust pipe 503 is fixedly arranged on the air outlet pipe 502 through a pressure reducing valve. When in use, when the clamp plate 2 slides downward to make the product sink into the water, the airbag 5 can be compressed, and the gas in the airbag 5 enters the first piston chamber 301 through the air outlet pipe 502, pushing the sealing plate 4 to seal the product. As the clamp plate 2 continues to descend, the pressure in the first piston chamber 301 continues to rise, when the set value of the pressure reducing valve is reached, the excess gas in the airbag 5 can be discharged to the outside of the water tank 1 through the exhaust pipe 503, so as to avoid damage to the airbag 5, and the pressure in the first piston chamber 301 is greater than the test gas pressure in the product.

[0026] Reference Figure 3 and Figure 6 A support seat 201 is provided on the fixture plate 2, and the support seat 201 is preferably provided with two groups. A second piston chamber 203 is opened in the fixture plate 2, and a piston plate 204 is slidably provided in the second piston chamber 203. The piston plate 204 is fixedly connected to the support seat 201 through a support column 202, and a first spring is sleeved on the support column 202, and the two ends of the first spring are respectively abutted against the fixture plate 2 and the support seat 201, and the second piston chamber 203 is connected with the first piston chamber 301 through a first pipe, and a second pipe is fixedly provided on the second piston chamber 203, and the second pipe is connected with the outside of the water tank 1, and a one-way valve is fixedly provided on the first pipe and the second pipe. When in use, by placing the product on the support seat 201, the gas in the second piston chamber 203 can be transported to the first piston chamber 301 through the first pipe, and the sealing plate 4 and the sealing gasket 401 can pre-clamp the product to improve the use effect.

[0027] Reference Figure 3 , Figure 4 and Figure 7 , limiting grooves 102 are provided on the inner walls on both sides of the water tank 1, and two groups of purge plates 8 are arranged. The two groups of purge plates 8 are respectively located on the inner walls on both sides of the water tank 1 and close to the top of the water tank 1, and a connecting plate 805 is fixedly arranged on the purge plate 8. The connecting plates 805 are preferably symmetrically arranged in two groups, and the connecting plates 805 are respectively slidably arranged in the corresponding limiting grooves 102, and a reciprocating screw 9 is rotatably arranged in one group of the limiting grooves 102, and the connecting plate 805 is threadedly connected to the reciprocating screw 9. When in use, by driving the reciprocating screw 9 to rotate, the purge plate 8 can be driven to slide back and forth in the water tank 1, thereby increasing the spraying range of the nozzle 801 and helping to improve the purge effect.

[0028] Reference Figure 7 A rotating chamber 103 is provided in the water tank 1, a rotating shaft is rotatably provided in the rotating chamber 103, a first vortex blade 901 is fixedly provided on the rotating shaft, an air inlet pipe 501 is passed through the rotating chamber 103 and communicated with the outside of the water tank 1, and the rotating shaft is fixedly connected with the reciprocating screw 9. When in use, when the fixture plate 2 is carried up with the product, the air bag 5 can be pulled through the air inlet pipe 501 to extract gas from the outside. During the gas extraction process, the gas flows through the rotating chamber 103, and can pass through the first vortex blade 901 to rotate the rotating shaft and the reciprocating screw 9, so as to drive the purge plate 8 to slide back and forth. Here, a motor can also be used to drive the reciprocating screw 9 to rotate as needed.

[0029] Reference Figure 1 , Figure 3 , Figure 4 and Figure 8A top plate 7 is fixedly arranged on the top of the fixture plate 2 through a column 701. The top plate 7 can reduce dust from entering the water tank 1 during the test and improve the use effect. A mounting hole 702 is opened on the top plate 7. An annular seat 10 is rotatably arranged in the mounting hole 702. A fixed shaft is arranged in the annular seat 10. A plurality of groups of second vortex blades are fixedly arranged between the annular seat 10 and the fixed shaft. The second vortex blades are arranged in two to fifteen groups, preferably ten groups. A first rod 11 is fixedly arranged on the fixed shaft. A second rod 12 is fixedly arranged at the bottom of the first rod 11. A ball 13 is fixedly arranged on the second rod 12 through a second spring. When in use, When the product sinks into the water and leaks, bubbles can be generated on the water surface. The bubbles burst and the gas rises, flowing out of the water tank 1 through the mounting hole 702. During this process, the annular seat 10 can be driven to rotate in the mounting hole 702 through the second vortex blade, and then the first rod 11 can rotate with the second rod 12. During the rotation of the second rod 12, the ball 13 can be brought to knock on the outer wall of the product. During the knocking process, the bubbles at the leakage position of the product can be made easier to emerge, which is convenient for the detection camera to find the leakage point and improve the use effect. When the clamp plate 2 and the top plate 7 rise, the gas will flow out from all sides of the top plate 7, and the first rod 11 will no longer rotate at this time.

[0030] Reference Figure 4 and Figure 5A storage bin 803 is provided in the purge plate 8, a feeding pipe for feeding the storage bin 803 is fixedly arranged on the top of the purge plate 8, the top of the nozzle 14 is connected with the storage bin 803, and the nozzle 14 is located in the blowing groove 802, a slide groove 804 is provided in the purge plate 8, a slider is slidably provided in the slide groove 804, a push plate 16 is fixedly provided on one end of the slider, a long strip plate 19 is fixedly provided on the push plate 16, a cam 15 is fixedly provided on the first rod 11, the long strip plate 19 is abutted against the cam 15, and a sliding plate 17 is fixedly provided on the other end of the slider, the sliding plate 17 passes through the nozzle 14, and a through hole 18 connected with the nozzle 14 is provided on the sliding plate 17, a sealing ring is fixedly provided on the nozzle 14, the sealing ring is respectively abutted against the top end face and the bottom end face of the sliding plate 17, a third spring is sleeved on the sliding plate 17, and the third The two ends of the spring are respectively against the slider and the slide groove 804. In the initial position, under the elastic force of the third spring, the slider is against the left side of the slide groove 804, that is, the slide groove 804 is against the side close to the first rod 11, and at this time the sliding plate 17 blocks the nozzle 14, that is, the through hole 18 is not connected with the nozzle 14 at this time. During use, when air leakage occurs, the first rod 11 rotates with the cam 15, and can slide the slider and the sliding plate 17 back and forth through the long strip 19 and the push plate 16. When the through hole 18 is connected with the nozzle 14, the marking liquid in the nozzle 14 can fall into the blowing groove 802. When the nozzle 801 is purging, the marking liquid can be sprayed on the product, and only the three nozzles 801 in the middle position of the purging plate 8 and the adjacent middle position have marking liquid, and in one purging process, the marking liquid falling in the blowing groove 802 can be completely blown out to avoid residue.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for detecting gas turbine casing air tightness, characterized in that: The following steps are involved: Step 1: When the surface temperature of the casing is between 15℃ and 25℃, seal both ends of the casing and other pipe openings, and then sink it into water with a temperature of 15℃ to 25℃; Step 2: Fill the receiver with gas of a certain pressure, wait for a while, and observe whether the gas pressure in the receiver drops significantly or whether bubbles appear on the water surface; Step 3: When the gas pressure drops significantly or bubbles are generated, it is judged as a leak. Take it out of the water, clean the water on the surface, and then mark the surface of the product.

2. A gas turbine casing air tightness detection method according to claim 1, characterized in that: It also comprises a water tank (1), wherein a fixture plate (2) is arranged in a lifting manner in the water tank (1), and sealing components for sealing the two ends of the casing are respectively arranged at both ends of the fixture plate (2), and a purge plate (8) is slidably arranged in the water tank (1), and a plurality of groups of nozzles (801) for purging the casing are fixedly arranged on the purge plate (8), and a nozzle (14) for marking is fixedly arranged in the purge plate (8).

3. A gas turbine casing air tightness detection method according to claim 2, characterized in that: The water tank (1) is provided with guide grooves (101) at both ends, and the clamping plate (2) is slidably arranged at both ends in the corresponding guide grooves (101), and a screw rod (6) is rotatably arranged in one group of the guide grooves (101), one end of the clamping plate (2) is threadedly connected to the screw rod (6), and a motor (601) for driving the screw rod (6) to rotate is fixedly arranged on the water tank (1).

4. A gas turbine casing air tightness detection method according to claim 3, characterized in that: The sealing assembly comprises a fixing seat (3) fixedly arranged at both ends of the clamp plate (2), wherein a first piston cavity (301) is provided in the fixing seat (3), a sealing plate (4) is slidably arranged in the first piston cavity (301), a sealing gasket (401) is fixedly arranged on the sealing plate (4), and an inflation tube (402) for inflating air into the casing is provided on the sealing plate (4).

5. A gas turbine casing air tightness detection method according to claim 4, characterized in that: An air bag (5) is arranged in the guide groove (101), an air inlet pipe (501) is fixedly arranged at one end of the air bag (5), and an air outlet pipe (502) connected to the first piston chamber (301) is fixedly arranged at the other end of the air bag (5), both the air inlet pipe (501) and the air outlet pipe (502) are fixedly arranged with a one-way valve, and an exhaust pipe (503) is fixedly arranged on the air outlet pipe (502) via a pressure reducing valve.

6. A gas turbine casing air tightness detection method according to claim 5, characterized in that: A support seat (201) is provided on the fixture plate (2), a second piston chamber (203) is provided in the fixture plate (2), a piston plate (204) is slidably provided in the second piston chamber (203), the piston plate (204) is fixedly connected to the support seat (201) via a support column (202), and a first spring is sleeved on the support column (202), the two ends of the first spring are respectively against the fixture plate (2) and the support seat (201), the second piston chamber (203) is connected to the first piston chamber (301) via a first pipe, a second pipe is fixedly provided on the second piston chamber (203), and a one-way valve is fixedly provided on both the first pipe and the second pipe.

7. A gas turbine casing air tightness detection method according to claim 6, characterized in that: Limiting grooves (102) are provided on the inner walls on both sides of the water tank (1), two groups of purge plates (8) are provided, and the two groups of purge plates (8) are respectively located on the inner walls on both sides of the water tank (1), and a connecting plate (805) is fixedly provided on the purge plate (8), and the connecting plate (805) is slidably provided in the limiting groove (102), and a reciprocating screw (9) is rotatably provided in the limiting groove (102), and the connecting plate (805) is threadedly connected to the reciprocating screw (9).

8. A gas turbine casing air tightness detection method according to claim 7, characterized in that: A rotating chamber (103) is provided in the water tank (1), a rotating shaft is rotatably arranged in the rotating chamber (103), a first vortex blade (901) is fixedly arranged on the rotating shaft, the air inlet pipe (501) passes through the rotating chamber (103) and is in communication with the outside of the water tank (1), and the rotating shaft is fixedly connected to the reciprocating screw (9).

9. A gas turbine casing air tightness detection method according to claim 8, characterized in that: A top plate (7) is fixedly arranged on the top of the fixture plate (2) via a column (701); a mounting hole (702) is provided on the top plate (7); an annular seat (10) is rotatably arranged in the mounting hole (702); a fixed shaft is arranged in the annular seat (10); a plurality of groups of second vortex blades are fixedly arranged between the annular seat (10) and the fixed shaft; a first rod (11) is fixedly arranged on the fixed shaft; a second rod (12) is fixedly arranged at the bottom of the first rod (11); and a sphere (13) is fixedly arranged on the second rod (12) via a second spring.

10. A gas turbine casing air tightness detection method according to claim 9, characterized in that: A material storage bin (803) is provided in the purge plate (8), the nozzle (14) is connected to the material storage bin (803), a slide groove (804) is provided in the purge plate (8), a slider is slidably provided in the slide groove (804), a push plate (16) is fixedly provided at one end of the slider, a long strip plate (19) is fixedly provided on the push plate (16), a cam (15) is fixedly provided on the first rod (11), the long strip plate (19) abuts against the cam (15), and a sliding plate (17) is fixedly provided at the other end of the slider, the sliding plate (17) passes through the nozzle (14), a through hole (18) connected to the nozzle (14) is provided on the sliding plate (17), and a third spring is sleeved on the sliding plate (17), and two ends of the third spring abut against the slider and the slide groove (804) respectively.

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