Graphite sealing ring leakage rate measuring device and measuring method thereof
By designing an integrated graphite sealing ring leakage measurement device, the problems of long production cycles, high costs, and lack of observability caused by outsourced testing were solved, enabling self-testing and improving production efficiency and product quality improvement capabilities.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HARBIN DONGAN IND DEV
- Filing Date
- 2026-01-14
- Publication Date
- 2026-05-08
AI Technical Summary
In existing technologies, the leakage measurement of graphite sealing rings relies on external testing institutions, resulting in long production cycles, high costs, and unobservable processes, which affects product delivery schedules and the efficiency of quality improvement.
An integrated graphite sealing ring leakage measurement device and its measurement method were designed, including components such as a drive shaft, cover plate, air nozzle and observation window. It can perform leakage tests locally, simulate the actual use environment, and support parallel testing of multiple devices.
The self-testing of graphite sealing rings has been realized, which has shortened the production cycle, reduced the testing cost, improved the observability and efficiency of the test, and ensured the accuracy of the test results and the speed of problem location.
Smart Images
Figure CN121994428A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a graphite sealing ring leakage measurement device and method, belonging to the field of parts inspection technology. Background Technology
[0002] Graphite sealing rings, as a key component of mechanical seals, are typically used to form a physical barrier between two relatively moving parts (such as a rotating shaft and a stationary housing). Their core function is to prevent or minimize leakage of the working medium (such as liquid or gas) from the high-pressure side to the low-pressure side. During the manufacturing process of graphite sealing rings, leakage performance tests are required to verify whether their sealing performance meets design requirements, ensuring the reliability of subsequent batch processing.
[0003] However, in existing technologies, leakage measurement of graphite sealing components mainly relies on external testing companies to conduct leakage tests. That is, after the graphite ring is processed, the sample must be sent to a testing institution with specialized equipment for testing. After the testing company issues the test results, the decision on whether to proceed with production or make improvements and retesting is based on whether the sample passes or fails. This model has the following technical problems: First, the long testing cycle of outsourced testing leads to an uncontrollable production cycle. Because testing relies on the scheduling and testing procedures of external institutions, when the test results are unqualified, the design needs to be revised and the product sent out for retesting again. This iterative process significantly prolongs the research and development and production cycle of scientific research products, directly affecting the product delivery schedule.
[0004] Secondly, outsourced testing is costly. External testing agencies typically charge high testing fees, and multiple retests further increase costs, leading to an overall increase in the cost of graphite sealing components and weakening their market competitiveness.
[0005] Finally, the outsourced testing process is not observable. Because the tests are conducted by external organizations, R&D personnel cannot directly observe the testing process. When test results are abnormal, it is difficult to quickly locate the root cause of the problem, which may cause them to miss the opportunity to discover design defects or process problems, thus affecting the efficiency of product quality improvement. Summary of the Invention
[0006] To address the problems existing in the background art, the present invention provides a graphite sealing ring leakage measurement device and its measurement method.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: a graphite sealing ring leakage measuring device, comprising a drive shaft, an oil drain pipe connected to a right cover plate, an oil drain pipe connector body, a housing, a left cover plate, an outer cover plate, an oil inlet pipe connector body, an oil return nozzle, an air inlet nozzle, and an exhaust nozzle; the left and right ends of the housing are respectively connected to the left cover plate and the right cover plate, and the outer side wall of the housing is inserted and connected to the oil drain pipe connector body, the oil inlet pipe connector body, the oil return nozzle, the air inlet nozzle, and the exhaust nozzle; the output end of the drive shaft extends into the interior of the housing and is rotatably connected to the left cover plate and the right cover plate respectively; a flywheel is fixedly mounted on the outer side of the output end of the drive shaft, the flywheel is disposed inside the housing and located between the oil return nozzle and the oil drain pipe connector body, the oil inlet pipe connector body, the air inlet nozzle, and the exhaust nozzle; the outer side of the left cover plate is connected to the outer cover plate.
[0008] Furthermore, the outer wall of the flywheel is provided with an outer protrusion and two flat platforms, which are symmetrically arranged along the diameter of the flywheel.
[0009] Furthermore, the housing includes an integrally formed cylindrical oil and gas inlet chamber and a cylindrical oil and gas outlet chamber. The diameter of the oil and gas inlet chamber is smaller than that of the oil and gas outlet chamber. An oil drain pipe connector, an oil inlet pipe connector, an air inlet nozzle, and an air outlet nozzle are fixedly inserted into the outer wall of the oil and gas inlet chamber. An oil return nozzle is fixedly inserted into the outer wall of the oil and gas outlet chamber. The outer end face of the oil and gas inlet chamber is detachably and fixedly connected to the right cover plate, and the outer end face of the oil and gas outlet chamber is detachably and fixedly connected to the left cover plate. Threaded mounting holes are provided on the inner wall of the transition step surface of the oil and gas inlet chamber and the oil and gas outlet chamber.
[0010] Furthermore, the outer wall of the oil and gas input cavity is provided with two observation holes, and each observation hole is fixed with an observation window.
[0011] Furthermore, each of the observation windows is made of high-strength glass.
[0012] Furthermore, the inner end face of the right cover plate is provided with a weight reduction groove.
[0013] Furthermore, the flywheel disk has weight-reducing grooves on both its left and right ends.
[0014] The present invention discloses a method for measuring the leakage of a graphite sealing ring using a measuring device, the method comprising the following steps: S1: Fit the sealed runway of the part to the outer diameter of the flywheel disc; S2: Install the graphite sealing ring into the threaded mounting hole on the inner wall of the transition step surface of the housing, and fix the graphite sealing ring after the sealing end face of the graphite sealing ring is in contact with the sealing end face of the sealing track. S3: Install the measuring device horizontally on the test bench and fix the drive shaft to the output shaft of the test bench motor; S4: Connect the oil supply pipe connector to the oil supply device so that the output end of the oil supply pipe connector sprays test oil into the sealed runway in the oil and gas input chamber. S5: Connect the output end of the drain pipe connector to the automatic drain device to ensure the discharge of excess oil; S6: Connect the air inlet nozzle to the air supply device to inject clean high-pressure gas into the oil-gas input chamber; S7: Connect the exhaust nozzle to the automatic adjustment device. When the gas pressure in the oil-gas input chamber is greater than the set pressure, the gas will be automatically discharged. S8: Connect the return nozzle to the oil pipe, and connect the oil pipe to the measuring cup; S9: The motor of the test bench rotates, which drives the drive shaft with the sealed track installed to rotate, simulating the actual use of the sealed track and graphite sealing ring. S10: After the oil has accumulated enough to flow out of the return nozzle, measure the volume of the oil flowing out within a specified time to complete the leakage measurement.
[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention, through an integrated measurement device and supporting methods, enables self-testing of graphite sealing ring leakage, effectively overcoming the technical shortcomings of outsourced testing, such as long cycles, high costs, and unobservable processes. It supports production units in conducting independent tests, significantly shortening R&D and production cycles, reducing testing costs, and enhancing enterprise market competitiveness. The entire testing process is observable, facilitating real-time monitoring and rapid identification of root causes by R&D personnel, improving product quality improvement efficiency. By simulating the actual working environment of graphite sealing components (such as directional injection of oil-gas mixtures and dynamic sealing track rotation), the accuracy of test results is ensured. It supports parallel testing with multiple devices, enabling the discovery of potential product defects in the shortest possible time, improving testing efficiency. By reproducing the actual working conditions of graphite sealing rings in a non-installed state, it achieves precise measurement of leakage, providing graphite sealing component manufacturers with a controllable, visible, and low-cost testing solution. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 yes Figure 1 AA section view; Figure 3 yes Figure 1 BB section view; Figure 4 yes Figure 1 CC section view; Figure 5 This is a schematic diagram showing the connection relationship between the drive shaft and the flywheel. Figure 6 yes Figure 5 Side view; Figure 7 This is a schematic diagram of the shell structure; Figure 8 yes Figure 7 DD sectional view; Figure 9 yes Figure 7 EE sectional view. Detailed Implementation
[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the invention, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0018] A graphite sealing ring leakage measuring device includes a drive shaft 1, an oil drain pipe connected to a right cover plate 4, an oil drain pipe connector body 7, a housing 8, a left cover plate 9, an outer cover plate 13, an oil inlet pipe connector body 17, an oil return nozzle 19, an air inlet nozzle 22, and an exhaust nozzle 24. The left and right ends of the housing 8 are detachably fixed to the left cover plate 9 and the right cover plate 4 respectively by corresponding screws and sealing rings. The outer side wall of the housing 8 is inserted and connected to the oil drain pipe connector body 7, the oil inlet pipe connector body 17, the oil return nozzle 19, the air inlet nozzle 22, and the exhaust nozzle 24. The output end of the drive shaft 1 extends into the interior of the housing 8 and is rotatably connected to the left cover plate 9 and the right cover plate 4 respectively by corresponding high-speed bearings 2. The input end of the drive shaft 1 is coaxially fixed to the output shaft of the motor by a coupling. A skeleton oil seal 3 is also provided between the drive shaft 1 and the right cover plate 4. A flywheel disk 5 is integrally formed and fixedly mounted on the outer side of the output end of the drive shaft 1. The flywheel disk 5 is located inside the housing 8 and between the return oil nozzle 19 and the oil drain pipe connector 7, the oil inlet pipe connector 17, the air inlet nozzle 22, and the exhaust nozzle 24. A stepped platform is symmetrically arranged on both sides of the flywheel disk 5 along the axial direction of the drive shaft 1 for mounting high-speed bearings 2. The input end of the drive shaft 1 has a three-stage stepped structure in the direction away from the stepped platform. The center position of the outer side of the left cover plate 9 is detachably fixed to the outer cover plate 13 by corresponding screws. The corresponding high-speed bearing 2 is installed in the center positioning hole of the left cover plate 9, ensuring that the far end face of the shaft is in contact with the limiting end of the outer cover plate 13, forming a cover plate bearing assembly.
[0019] Furthermore, the outer wall of the flywheel disk 5 is provided with an outer protrusion 20 and two flat platforms 23 along its circumference. The two flat platforms 23 are symmetrically arranged along the diameter of the flywheel disk 5 and are used to install the sealed runway 10 of the parts.
[0020] Furthermore, the housing 8 includes an integrally formed cylindrical oil and gas input chamber 11 and a cylindrical oil and gas output chamber 12. The diameter of the oil and gas input chamber 11 is smaller than the diameter of the oil and gas output chamber 12. An oil drain pipe connector 7, an oil inlet pipe connector 17, an air inlet nozzle 22, and an air outlet nozzle 24 are fixedly inserted into the outer wall of the oil and gas input chamber 11. An oil return nozzle 19 is fixedly inserted into the outer wall of the oil and gas output chamber 12. The outer end face of the oil and gas input chamber 11 is detachably and fixedly connected to the right cover plate 4, and the outer end face of the oil and gas output chamber 12 is detachably and fixedly connected to the left cover plate 9. The inner wall of the transition step surface of the oil and gas input chamber 11 and the oil and gas output chamber 12 is provided with threaded mounting holes.
[0021] Furthermore, the outer wall of the oil and gas input cavity 11 is provided with two symmetrically arranged observation holes 14, and each observation hole 14 is glued and fixed with an observation window 15.
[0022] Furthermore, each of the observation windows 15 is made of high-strength glass.
[0023] Furthermore, the inner end face of the right cover plate 4 is provided with an annular weight-reducing groove 16.
[0024] Furthermore, the flywheel disk 5 has annular weight-reducing grooves 6 on both its left and right end faces.
[0025] The present invention discloses a method for measuring the leakage of a graphite sealing ring using a measuring device, the method comprising the following steps: S1: Fit the sealing runway 10 of the part onto the outer diameter of the flywheel 5, and seal the flywheel 5 and the sealing runway 10 with a corresponding sealing ring. S2: Install the graphite sealing ring 18 into the threaded mounting hole on the inner wall of the transition step surface of the housing 8, and fix the graphite sealing ring 18 with bolts after the sealing end face of the graphite sealing ring 18 is in contact with the sealing end face of the sealing runway 10. At the same time, install a rubber ring seal between the outer diameter of the graphite sealing ring 18 and the inner diameter of the housing 8 to ensure that the oil-gas mixture in the oil-gas input cavity 11 can only seep out from the micro gap between the graphite sealing ring 18 and the sealing runway 10. S3: Install the measuring device horizontally on the test bench, and fix the transmission shaft 1 to the output shaft of the motor on the test bench; S4: Connect the oil supply pipe connector 17 to the oil supply device so that the output end of the oil supply pipe connector 17 sprays test oil into the sealed runway 10 in the oil and gas input chamber 11. S5: Connect the output end of the drain pipe connector 7 to the automatic drain device to ensure the discharge of excess oil; S6: Connect the air inlet nozzle 22 to the air supply device and input clean high-pressure gas into the oil and gas input chamber 11; S7: Connect the exhaust nozzle 24 to the automatic adjustment device. When the gas pressure in the oil-gas input chamber 11 is greater than the set pressure, the gas will be automatically discharged. S8: Connect the return nozzle 19 to the oil pipe 21, and connect the oil pipe 21 to the measuring cup; S9: The motor of the test bench rotates, which drives the transmission shaft 1, on which the sealed runway 10 is installed, to rotate, simulating the actual use state of the sealed runway 10 and the graphite sealing ring 18. S10: After the oil has accumulated enough to flow steadily out of the return nozzle 19, measure the volume of the oil flowing out within a specified time to complete the leakage measurement.
[0026] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0027] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A graphite sealing ring leakage measurement device, characterized in that: It includes a drive shaft (1), an oil drain pipe connected to a right cover plate (4), an oil drain pipe connector body (7), a housing (8), a left cover plate (9), an outer cover plate (13), an oil inlet pipe connector body (17), an oil return nozzle (19), an air inlet nozzle (22), and an exhaust nozzle (24); the left and right ends of the housing (8) are connected to the left cover plate (9) and the right cover plate (4) respectively, and the outer side wall of the housing (8) is connected to the oil drain pipe connector body (7), the oil inlet pipe connector body (17), the oil return nozzle (19), the air inlet nozzle (22), and the exhaust nozzle (24). 4) All are connected by plug-in connection. The output end of the drive shaft (1) extends into the interior of the housing (8) and is rotatably connected to the left cover plate (9) and the right cover plate (4) respectively. A flywheel disc (5) is fixedly mounted on the outer side of the output end of the drive shaft (1). The flywheel disc (5) is located in the housing (8) and between the return oil nozzle (19) and the oil drain pipe connector (7), the oil inlet pipe connector (17), the air inlet nozzle (22), and the exhaust nozzle (24). The outer side of the left cover plate (9) is connected to the outer cover plate (13).
2. The graphite sealing ring leakage measuring device according to claim 1, characterized in that: The outer wall of the flywheel (5) is provided with an outer boss (20) and two flat platforms (23), which are symmetrically arranged along the diameter of the flywheel (5).
3. The graphite sealing ring leakage measuring device according to claim 1, characterized in that: The housing (8) includes an integrally formed cylindrical oil and gas input chamber (11) and a cylindrical oil and gas output chamber (12). The diameter of the oil and gas input chamber (11) is smaller than that of the oil and gas output chamber (12). The outer wall of the oil and gas input chamber (11) is fixedly connected to an oil drain pipe connector (7), an oil inlet pipe connector (17), an air inlet nozzle (22), and an exhaust nozzle (24). The outer wall of the oil and gas output chamber (12) is fixedly connected to a return oil nozzle (19). The outer end face of the oil and gas input chamber (11) is detachably and fixedly connected to the right cover plate (4), and the outer end face of the oil and gas output chamber (12) is detachably and fixedly connected to the left cover plate (9). The inner wall of the transition step surface of the oil and gas input chamber (11) and the oil and gas output chamber (12) is provided with threaded mounting holes.
4. The graphite sealing ring leakage measuring device according to claim 3, characterized in that: The outer wall of the oil and gas input cavity (11) is provided with two observation holes (14), and each observation hole (14) is fixed with an observation window (15).
5. The graphite sealing ring leakage measuring device according to claim 4, characterized in that: Each of the observation windows (15) is made of high-strength glass.
6. The graphite sealing ring leakage measuring device according to claim 1, characterized in that: The inner end face of the right cover plate (4) is provided with a weight reduction groove (16).
7. The graphite sealing ring leakage measuring device according to claim 1, characterized in that: The flywheel disk (5) has weight reduction grooves (6) on both its left and right ends.
8. A method for measuring the leakage of a graphite sealing ring according to any one of claims 1-7, characterized in that: The method includes the following steps: S1: Fit the sealed runway (10) of the part to the outer diameter of the flywheel disc (5); S2: Install the graphite sealing ring (18) into the threaded mounting hole on the inner wall of the transition step surface of the housing (8), and fix the graphite sealing ring (18) after the sealing end face of the graphite sealing ring (18) is in contact with the sealing end face of the sealing runway (10). S3: Install the measuring device horizontally on the test bench and fix the transmission shaft (1) to the output shaft of the motor on the test bench; S4: Connect the oil supply pipe connector (17) to the oil supply device so that the output end of the oil supply pipe connector (17) sprays test oil into the sealed runway (10) in the oil and gas input chamber (11); S5: Connect the output end of the drain pipe connector (7) to the automatic drain device to ensure the discharge of excess oil; S6: Connect the air inlet nozzle (22) to the air supply device and input clean high-pressure gas into the oil and gas input chamber (11); S7: Connect the exhaust nozzle (24) to the automatic adjustment device. When the gas pressure in the oil and gas input chamber (11) is greater than the set pressure, the gas will be automatically discharged. S8: Connect the return nozzle (19) to the oil pipe (21), and connect the oil pipe (21) to the measuring cup; S9: The motor of the test bench rotates, driving the transmission shaft (1) on which the sealed runway (10) is installed to rotate, simulating the actual use of the sealed runway (10) and the graphite sealing ring (18); S10: After the oil has accumulated enough to flow out of the return nozzle (19), measure the volume of the oil that flows out within a specified time to complete the leakage measurement.