Leakage rate measuring device for sealing test of sealing rings with inner opening and outer opening
By designing the leakage measurement device of the solenoid valve group and flowmeter, the problem of the leakage of the metal seal ring in the inner and outer openings of the aircraft engine is difficult to accurately measure, and high-precision leakage measurement and safe test operations are achieved.
Patent Information
- Application Number
- CN202421979116.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The prior art cannot directly measure the leakage amount of metal seal rings inside and outside the aircraft engine, and indirect measurement methods introduce manual operation errors, resulting in inaccurate test results.
A leakage measurement device including a solenoid valve group and a flowmeter is designed. By controlling the on-off of the solenoid valve group, the air flow direction is adjusted, and the leakage volume is directly measured in combination with the flowmeter to avoid manual operation errors.
It realizes accurate measurement of leakage of metal seal rings with internal and external openings, reduces the need for test bench replacement, improves measurement accuracy and safety, and is suitable for testing of a variety of sealing structures.
Smart Images
Figure CN223077702U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of leakage measurement devices, in particular to a leakage measurement device for the sealing test of inner and outer opening seal rings. Background Technique
[0002] Good sealing performance plays a crucial role in industrial production and experimental research, especially in determining the operating performance indicators of aeroengines (such as engine thrust-to-weight ratio, combustion efficiency, component life, flight cost, etc.). Particularly for the sealing of the gas path, advanced sealing technology means can greatly improve the pressure ratio and combustion efficiency of the engine, thereby enhancing the flight performance of the aircraft.
[0003] Currently, metal seal rings are required for gas path sealing on various connecting components of aeroengines. However, in China, there is still insufficient understanding of the theoretical knowledge in the field of aeroengine sealing technology and a lack of design experience. Therefore, the sealing test pieces need to be optimized and improved through a large number of tests. The metal seal rings required for aeroengines have both inner openings and outer openings. Therefore, a device is needed that can simultaneously measure the leakage of inner and outer opening metal seal rings during the sealing test.
[0004] Since the leakage of aeroengine sealing tests is very small, most previous devices indirectly measured the gas leakage through the water drainage method. This measurement method requires the construction of a complex water drainage and collection device and manual operation during the test process, which inevitably introduces unnecessary test errors caused by manual operation. With the upgrading of mass flow meters, when small-flow gases pass through the flow meter, they can also be accurately calculated. Before the leakage measurement device for the sealing test of inner and outer opening seal rings of the present invention appeared, there was no relevant device at home and abroad for directly measuring the leakage gas of this type of test.
[0005] The leakage measurement device for the sealing test of inner and outer opening seal rings has a simple structure. The construction of the measurement device mainly includes four aspects: selection of switching valves, pressure setting, test time setting, and data acquisition. Summary of the Invention
[0006] The purpose of the present invention is to provide a leakage measurement device for the sealing test of inner and outer opening seal rings, which effectively solves the problem of needing to replace the test bench for different opening seal ring sealing tests, and also solves the error problem caused by manual operation introduced by indirect measurement.
[0007] To achieve the above object, the utility model provides the following solution:
[0008] The utility model provides a leakage measurement device for the sealing test of inner and outer opening sealing rings, which includes a test bench and a leakage measurement system; the test bench includes an upper pressure plate and a lower pressure plate; the upper pressure plate is arranged above the lower pressure plate, and the edges of the upper pressure plate and the lower pressure plate are connected, and a sealing structure is arranged between the upper pressure plate and the lower pressure plate; an inner cavity vent hole is arranged at the center of the lower pressure plate, and an outer cavity vent hole is arranged on the side wall of the lower pressure plate; the leakage measurement system includes a first normally open solenoid valve, a second normally open solenoid valve, a third normally open solenoid valve, a fourth normally open solenoid valve, a normally closed solenoid valve, a flowmeter, a proportional valve, an inner cavity pressure sensor, an outer cavity pressure sensor and a differential pressure sensor; the normally closed solenoid valve, the proportional valve and the first normally open solenoid valve are sequentially arranged on the air inlet pipeline; the fourth normally open solenoid valve is arranged on the exhaust pipeline; one end of a parallel pipeline is communicated with the air inlet pipeline between the proportional valve and the first normally open solenoid valve, and the other end of the parallel pipeline is communicated with the exhaust pipeline at the air outlet end of the fourth normally open solenoid valve; the second normally open solenoid valve and the third normally open solenoid valve are sequentially arranged on the parallel pipeline from the air inlet pipeline to the exhaust pipeline; the second normally open solenoid valve and the third normally open solenoid valve are communicated with one end of an inner cavity pipeline, and the other end of the inner cavity pipeline is communicated with the inner cavity vent hole; the flowmeter and the inner cavity pressure sensor are arranged on the inner cavity pipeline; the air inlet end of the fourth normally open solenoid valve is connected with the outer cavity vent hole through an outer cavity pipeline, and the outer cavity pressure sensor is arranged on the outer cavity pipeline; a branch pipe is arranged between the outer cavity pressure sensor and the air inlet end of the fourth normally open solenoid valve and is connected with the first normally open solenoid valve; a differential pressure sensor is arranged between the inner cavity pipeline and the outer cavity pipeline.
[0009] Optionally, the sealing structure includes a corrugated ring, an upper pressure plate sealing gasket and a lower pressure plate sealing gasket; the corrugated ring is arranged between the upper pressure plate and the lower pressure plate, the upper pressure plate sealing gasket is arranged between the corrugated ring and the upper pressure plate, and the lower pressure plate sealing gasket is arranged between the corrugated ring and the lower pressure plate.
[0010] Optionally, the upper pressure plate and the corrugated ring are connected by an upper pressure plate fastening bolt group, and the lower pressure plate and the corrugated ring are connected by a lower pressure plate fastening bolt group.
[0011] Optionally, a pressure reducing valve is arranged between the normally closed solenoid valve and the proportional valve.
[0012] Optionally, it further includes an analog quantity acquisition module, an output module, a digital quantity output module, a serial communication module, and a working computer; the analog quantity acquisition module is electrically connected to the output module, the digital quantity output module, the serial communication module, the working computer, the flowmeter, the inner cavity pressure sensor, the outer cavity pressure sensor, and the differential pressure sensor.
[0013] Optionally, the first normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve, and the normally closed solenoid valve are respectively electrically connected to an intermediate relay, and the intermediate relay controls the on / off of the first normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve, and the normally closed solenoid valve by receiving the signal of the digital quantity output module to switch the air intake mode of the inner and outer cavities.
[0014] The utility model has achieved the following technical effects compared with the prior art:
[0015] 1. By controlling the on / off of the solenoid valve group, the direction of the air flow can be controlled to realize the leakage measurement test of the metal sealing ring with different opening orientations, avoiding the problem of building a new test bench for the metal sealing ring test with different openings.
[0016] 2. Using a brand-new flowmeter, the leakage amount of the gas can be accurately and intuitively read, avoiding the error caused by the indirect measurement through the intermediate conversion of other substances discharged by the gas.
[0017] 3. The solenoid valve is used to remotely control the flow direction of the air flow, avoiding the safety hazards caused by manually adjusting the switch valve. The solenoid valve group can be opened or stopped simultaneously, ensuring the synchronism of the gas flow direction.
[0018] 4. It has a wide range of applications. It can not only be used for the leakage measurement of metal sealing rings with different openings, but also for the sealing performance test of metal sealing rings with different cross-sectional shapes (W-shaped, C-shaped, multi-W-shaped). At the same time, it can also be used for various sealing tests such as the circumferential seal and end face seal of aeroengines. Description of the Drawings
[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0020] Figure 1 It is the schematic diagram of the leakage measurement device for the inner and outer opening sealing ring sealing test in the present utility model;
[0021] Figure 2 This is a structural schematic diagram of the leakage measurement device for the inner and outer opening seal rings in the present utility model for seal tests.
[0022] Figure 3 This is a schematic diagram of leakage measurement in the mode of inner cavity air intake and outer cavity air exhaust in the present utility model.
[0023] Figure 4 This is a schematic diagram of leakage measurement in the mode of outer cavity air intake and inner cavity air exhaust in the present utility model.
[0024] Explanation of reference numerals:
[0025] 1. First normally open solenoid valve; 2. Second normally open solenoid valve; 3. Third normally open solenoid valve; 4. Fourth normally open solenoid valve; 5. Normally closed solenoid valve; 6. Flowmeter; 7. Proportional valve; 8. Inner cavity pressure sensor; 9. Outer cavity pressure sensor; 10. Differential pressure sensor; 12. Upper pressure plate; 13. Lower pressure plate; 14. Upper pressure plate fastening bolt group; 15. Corrugated ring; 16. Lower pressure plate fastening bolt group; 17. Upper pressure plate sealing gasket; 18. Lower pressure plate sealing gasket; 19. Inner cavity ventilation hole; 20. Outer cavity ventilation hole. Detailed implementation manners
[0026] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0027] The object of the present invention is to provide a leakage measurement device for inner and outer opening seal rings in seal tests, so as to solve the problems existing in the prior art. By controlling the opening and closing of multiple solenoid valves, the air flow is directed to the inner cavity ventilation hole or the outer cavity ventilation hole, effectively solving the problem of needing to replace the test bench for different opening seal ring seal tests, and also solving the error problem caused by manual operation introduced by indirect measurement.
[0028] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.
[0029] As Figures 1 to 4As shown in the figure, this embodiment provides a leakage measurement device for the internal and external opening seal rings. Its main structure includes a solenoid valve group composed of a first normally open solenoid valve 1, a second normally open solenoid valve 2, a third normally open solenoid valve 3, a fourth normally open solenoid valve 4, and a normally closed solenoid valve 5, as well as a flowmeter 6, a proportional valve 7, an internal cavity pressure sensor 8, an external cavity pressure sensor 9, and a differential pressure sensor 10.
[0030] Reference Figure 1 , Figure 1 After the air inlet in [], there is a normally closed solenoid valve 5, which is located on the main air path of the air system. There is also a proportional valve 7 on the same main air path, located after the normally closed solenoid valve 5. Since the proportional valve 7 has a pressure upper limit, a pressure reducing valve is installed between the normally closed solenoid valve 5 and the proportional valve 7 to prevent excessive air pressure from damaging the proportional valve 7. The connection between the first normally open solenoid valve 1 and the fourth normally open solenoid valve 4 is similar to the parallel relationship in an electric circuit. The second normally open solenoid valve 2 and the third normally open solenoid valve 3 are connected in series on the left side of the connection line between the parallel first normally open solenoid valve 1 and the fourth normally open solenoid valve 4. A pipeline is branched out between the second normally open solenoid valve 2 and the third normally open solenoid valve 3 and connected to the flowmeter 6. The internal cavity pressure sensor 8 is located after the flowmeter 6 and then leads to the internal cavity ventilation port. The external cavity pressure sensor 9 is located at the right end of the fourth normally open solenoid valve 4 and then leads to the external cavity ventilation port. The differential pressure sensor 10 is located between the internal cavity pipeline and the external cavity pipeline.
[0031] The normally closed solenoid valve 5 is located on the main air path and serves as a main switch to control the on-off of the air supply system. The solenoid valve group composed of the first normally open solenoid valve 1, the second normally open solenoid valve 2, the third normally open solenoid valve 3, and the fourth normally open solenoid valve 4 can achieve two different test purposes of internal cavity air intake, external cavity exhaust, and external cavity air intake, internal cavity exhaust by adjusting the on-off of the corresponding solenoid valves. The proportional valve 7 and the differential pressure sensor 10 cooperate to control the differential pressure to be stable at the test set value, and the differential pressure indication is used as a feedback value to adjust the output ratio of the proportional valve 7. The flowmeter 6 can upload the real-time flow rate to the PC side, and the leakage amount within a certain period of time can be calculated through the collected data. The internal cavity pressure sensor 8 and the external cavity pressure sensor 9 are used as a set of redundant devices to assist the differential pressure sensor 10 in working and to read the internal and external cavity pressures.
[0032] It also includes an analog acquisition module, an output module, a digital output module, a serial communication module, and a working computer; the analog acquisition module is electrically connected to the output module, the digital output module, the serial communication module, the working computer, the flowmeter 6, the inner cavity pressure sensor 8, the outer cavity pressure sensor 9, and the differential pressure sensor 10. The analog acquisition module is used to collect the data obtained by the flowmeter 6, the inner cavity pressure sensor 8, the outer cavity pressure sensor 9, and the differential pressure sensor 10. The collected data is transmitted to the working computer through the serial communication module for real-time data storage and analysis; the analog output module outputs the obtained analog quantity to the proportional valve 7 to control the differential pressure through it; the digital output module outputs digital quantities by receiving the instructions issued by the working computer to control the first normally open solenoid valve 1, the second normally open solenoid valve 2, the third normally open solenoid valve 3, the fourth normally open solenoid valve 4, and the normally closed solenoid valve 5 to work.
[0033] The first normally open solenoid valve 1, the second normally open solenoid valve 2, the third normally open solenoid valve 3, the fourth normally open solenoid valve 4, and the normally closed solenoid valve 5 are respectively electrically connected to an intermediate relay. The intermediate relay controls the on-off of the first normally open solenoid valve 1, the second normally open solenoid valve 2, the third normally open solenoid valve 3, the fourth normally open solenoid valve 4, and the normally closed solenoid valve 5 by receiving the signal of the digital output module to switch the air intake mode of the inner and outer cavities.
[0034] 1. Structure construction of the test bench
[0035] Reference Figure 2 , Figure 2 is a structural schematic diagram of a leakage measurement test bench device that can be used for the seal test of both inner and outer opening metal seal rings at the same time. Its main structure includes an upper pressing plate 12, a lower pressing plate 13, an upper pressing plate fastening bolt group 14, a corrugated ring 15, a lower pressing plate fastening bolt group 16, an upper pressing plate sealing gasket 17, a lower pressing plate sealing gasket 18, an inner cavity vent hole 19, and an outer cavity vent hole 20.
[0036] Reference Figure 2 , Figure 2 In [reference], the upper pressing plate 12 is placed under the hydraulic cylinder and is connected to the corrugated ring 15 through the upper pressing plate fastening bolt group 14. The upper pressing plate sealing gasket 17 is placed between the upper pressing plate 12 and the corrugated ring 15. The lower pressing plate 13 is below the corrugated ring 15 and is connected to the corrugated ring 15 through the lower pressing plate fastening bolt group 16. Similarly, the lower pressing plate sealing gasket 18 is placed between the corrugated ring 15 and the lower pressing plate 13. The metal seal ring test piece is placed on the plane of the lower pressing plate 13. The inner cavity vent hole 19 is located at the center of the lower pressing plate 13, and the outer cavity vent hole 20 is on the side wall of the lower pressing plate 13.
[0037] The upper pressure plate 13 is connected to the hydraulic cylinder, which can apply a force to the metal seal ring test piece placed on the lower pressure plate 13, so that the test piece reaches the compression amount of the test condition and maintains the set pressure difference. The upper pressure plate sealing washer 17 and the lower pressure plate sealing washer 18 both play a sealing role. By tightening the upper pressure plate fastening bolt group 14 and the lower pressure plate fastening bolt group 16, the outer cavity is isolated from the atmosphere, achieving the effect of sealing the outer cavity. The lower pressure plate 13 is used to place the metal seal ring test piece and for air intake and exhaust. The corrugated ring 15 can be compressed by a certain height. By cooperating with the lower pressure plate sealing washer 18, it can meet the tests of metal seal ring test pieces of different heights. For the inner opening test piece, the lower pressure plate sealing washer 18 does not need to be placed. Only for the outer opening test, the lower pressure plate sealing washer 18 needs to be placed.
[0038] 2. Gas leakage measurement process
[0039] The gas leakage measurement process is as Figure 1 、 3 and shown in Figure 4. Before measurement, as Figure 1 shown, the normally closed solenoid valve 5 and the first normally open solenoid valves 1, 2, 3, and 4 are not energized. At this time, the first normally open solenoid valves 1, 2, 3, and 4 are all in the open state, and the normally closed solenoid valve 5 is in the closed state. Before the measurement process starts, the selection of two air intake modes can be realized. As Figure 3 shown, for the inner cavity air intake and outer cavity exhaust mode, during measurement, the first normally open solenoid valve 1, the third normally open solenoid valve 3, and the normally closed solenoid valve 5 are energized simultaneously. At this time, the first normally open solenoid valve 1 and the third normally open solenoid valve 3 are in the closed state, and the normally closed solenoid valve 5 is in the open state. The second normally open solenoid valve 2 and the fourth normally open solenoid valve 4 are still in the open state because they are not energized. At this time, the inner cavity will be filled with gas. Through the adjustment of the proportional valve 7, the inner cavity reaches the set pressure difference. After reaching the specified pressure difference, the PC terminal reminds to start the test. At this time, the flowmeter 6 starts to work. When gas leaks from the inner cavity to the outer cavity, the reading of the pressure difference sensor 10 between the inner cavity and the outer cavity will change. Then, it will prompt the proportional valve 7 to adjust the air filling into the inner cavity to maintain the air pressure at the set pressure difference. During the adjustment process, for every amount of gas leaking from the inner cavity, a corresponding amount of gas will be replenished from the gas station into the inner cavity. The gas replenished into the inner cavity will pass through the flowmeter 6, and the flow at this time will be recorded in real time by the PC terminal. After the test is completed, the leakage amount of the test can be obtained. As Figure 4As shown, for the external cavity air intake and internal cavity air exhaust mode, during measurement, the second normally open solenoid valve 2, the fourth normally open solenoid valve 4, and the normally closed solenoid valve 5 are energized simultaneously. At this time, the second normally open solenoid valve 2 and the fourth normally open solenoid valve 4 are in the closed state, and the normally closed solenoid valve 5 is in the open state. Since the first normally open solenoid valve 1 and the third normally open solenoid valve 3 are not energized, they remain in the open state. At this time, the gas will enter the external cavity along the open pipeline. The outer wall of the external cavity is sealed by the corrugated ring 5, the upper pressing plate 12, and the lower pressing plate 13. The pressure difference in the external cavity gradually reaches the set value. After the test starts, when there is gas leakage in the metal seal ring test piece, the leaked gas will flow from the external cavity to the internal cavity and then flow through the flowmeter 6 through the internal cavity vent hole 19. The way to maintain the pressure difference in the external cavity is the same as that in the above-mentioned internal cavity air intake and external cavity air exhaust mode. When the test is over, the PC can obtain the gas mass flow data passing through the flowmeter 6 during the test time, and at this time, the mass flow of the leaked gas can be obtained.
[0040] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.
[0041] In this specification, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be understood as a limitation to the present invention.
Claims
1. A leakage measurement device for the seal test of internal and external opening seal rings, characterized in that, It includes a test bench and a leakage measurement system; the test bench includes an upper pressing plate and a lower pressing plate; the upper pressing plate is arranged above the lower pressing plate, and the edges of the upper pressing plate and the lower pressing plate are connected. A sealing structure is arranged between the upper pressing plate and the lower pressing plate; an inner cavity vent hole is arranged at the center of the lower pressing plate, and an outer cavity vent hole is arranged on the side wall of the lower pressing plate; the leakage measurement system includes a first normally open solenoid valve, a second normally open solenoid valve, a third normally open solenoid valve, a fourth normally open solenoid valve, a normally closed solenoid valve, a flowmeter, a proportional valve, an inner cavity pressure sensor, an outer cavity pressure sensor and a differential pressure sensor; the normally closed solenoid valve, the proportional valve and the first normally open solenoid valve are sequentially arranged on the inlet pipeline; the fourth normally open solenoid valve is arranged on the exhaust pipeline; one end of the parallel pipeline is communicated with the inlet pipeline between the proportional valve and the first normally open solenoid valve, and the other end of the parallel pipeline is communicated with the exhaust pipeline at the air outlet end of the fourth normally open solenoid valve; the second normally open solenoid valve and the third normally open solenoid valve are sequentially arranged on the parallel pipeline from the inlet pipeline to the exhaust pipeline; the second normally open solenoid valve and the third normally open solenoid valve are communicated with one end of the inner cavity pipeline, and the other end of the inner cavity pipeline is communicated with the inner cavity vent hole; the flowmeter and the inner cavity pressure sensor are arranged on the inner cavity pipeline; the air inlet end of the fourth normally open solenoid valve is connected with the outer cavity vent hole through the outer cavity pipeline, and the outer cavity pressure sensor is arranged on the outer cavity pipeline; a branch pipe is arranged between the outer cavity pressure sensor and the air inlet end of the fourth normally open solenoid valve and is connected with the first normally open solenoid valve; a differential pressure sensor is arranged between the inner cavity pipeline and the outer cavity pipeline.
2. The leakage measurement device for the inner and outer opening seal ring seal test according to claim 1, wherein The sealing structure includes a corrugated ring, an upper pressing plate sealing gasket and a lower pressing plate sealing gasket; the corrugated ring is arranged between the upper pressing plate and the lower pressing plate, the upper pressing plate sealing gasket is arranged between the corrugated ring and the upper pressing plate, and the lower pressing plate sealing gasket is arranged between the corrugated ring and the lower pressing plate.
3. The leakage measurement device for the inner and outer opening seal ring seal test according to claim 2, wherein The upper pressing plate and the corrugated ring are connected through an upper pressing plate fastening bolt group, and the lower pressing plate and the corrugated ring are connected through a lower pressing plate fastening bolt group.
4. The leakage measurement device for the inner and outer opening seal ring seal test according to claim 1, characterized in that, A pressure reducing valve is arranged between the normally closed solenoid valve and the proportional valve.
5. The leakage measurement device for the inner and outer opening seal ring seal test according to claim 1, characterized in that, It also includes an analog acquisition module, an output module, a digital output module, a serial communication module and a working computer; the analog acquisition module is electrically connected with the output module, the digital output module, the serial communication module, the working computer, the flowmeter, the inner cavity pressure sensor, the outer cavity pressure sensor and the differential pressure sensor.
6. The leakage measurement for the inner and outer opening seal ring sealing test according to claim 5 Device, characterized in that, The first normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve and the normally closed solenoid valve are respectively electrically connected with an intermediate relay, and the intermediate relay controls the first by receiving the signal of the digital output module The on-off states of the normally open solenoid valve, the second normally open solenoid valve, the third normally open solenoid valve, the fourth normally open solenoid valve, and the normally closed solenoid valve are used to switch the intake air mode between the inner and outer cavities.