A lip seal dynamic eccentricity testing device and method

Abstract

The application discloses a kind of lip seal dynamic eccentric test device and method, test device includes rack, motor, eccentric disc, spline tooth cover and spline rotating shaft, the output shaft of motor is connected with one side of eccentric disc, the other side of eccentric disc is connected with spline rotating shaft by spline tooth cover, bearing is installed in rack, spline rotating shaft passes through bearing, oil inlet connector is connected on rack, oil inlet connector is connected with oil inlet pipe, the other end of oil inlet pipe is connected with thin oil station by electric pump, the lower part of lip seal is equipped with displacement sensor.The application has simple structure, low cost, wide application range, can simulate lip seal actual use working condition environment for testing with maximum limit at low cost.In the application, stress, strain, temperature sensor and other improvement measures are added at lip seal, which is further studied, and is also suitable for industrialized lip seal brand selection test work.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing test, in particular to a lip seal dynamic eccentric test device and method. BACKGROUND

[0002] The rotary shaft lip seal is widely used in the fields of ship, automobile, petroleum, electronics, machinery and aerospace, etc. due to its good followability and compensation, small friction resistance and other advantages, and is one of the indispensable safety devices for preventing leakage of various media such as gas, liquid and solid. Seal failure is one of the most important problems faced by the lip seal. Seal failure not only causes environmental pollution problems, but also causes economic losses due to lubricating oil leakage. Lubricating oil leakage has a bad influence on product use and product brand image. In severe cases, it may even cause the entire product to fail, causing great harm to the safe and reliable use of the product.

[0003] When testing the lip seal, an eccentric sleeve is usually arranged at the installation position of the lip seal, and the eccentric position is unchanged, that is, static eccentricity is used to test the influence of eccentricity on the sealing performance of the lip seal. The eccentric position changes, that is, dynamic eccentricity, which is not the same as the eccentricity caused by alignment and other factors during product use. The conventional lip seal test bench adds lubricating oil to the sealing cavity to study the pressure resistance of the lip seal. Analysis and research show that the bearing near the installation position of the lip seal will generate a large amount of oil mist in the inner cavity during rotation. The conventional lip seal test bench is quite different from the actual use environment in mechanism, so the test results are not very accurate. If the unqualified lip seal is used in actual use, it will cause leakage. SUMMARY

[0004] The present application provides a lip seal dynamic eccentric test device and method to solve the problem that the results are not very accurate when testing the lip seal by static eccentricity, and the unqualified lip seal causes leakage.

[0005] In order to achieve the above-mentioned application purposes, the present application provides the following technical solutions:

[0006] On the one hand, the present application provides a lip seal dynamic eccentric test device, which comprises a rack, a motor, an eccentric disc, a spline tooth sleeve and a spline rotating shaft. The spline rotating shaft is located in the rack, the rack is provided with a lip seal, the output shaft of the motor is connected with one side of the eccentric disc, the other side of the eccentric disc is connected with the spline rotating shaft through the spline tooth sleeve, a bearing is installed in the rack, and the spline rotating shaft penetrates through the bearing.

[0007] The application introduces an eccentric excitation source by installing an eccentric disc on the spline rotating shaft, connecting the eccentric disc with the spline tooth sleeve and the spline rotating shaft to form a dynamic eccentricity, and using a bearing to simulate the lip seal test method in a sealed rack interior in a large amount of oil mist environment in the actual use process, and the eccentricity can be adjusted by replacing different eccentric discs according to the needs, and the lip seal is tested in different conditions, and a dynamic eccentricity that changes periodically in the radial direction over time can be generated at the lip seal installation position through the structure, and the dynamic eccentricity is closer to the actual working condition of the lip seal in the running process compared with the static eccentricity simulated by installing only the eccentric sleeve on the lip seal.

[0008] Preferably, a displacement sensor is installed on the lower part of the lip seal, and the displacement sensor is connected with the controller for measuring the actual eccentricity of the lip seal. The actual eccentricity of the test device can be monitored and recorded in real time through the displacement sensor, and the eccentricity of the lip seal can be flexibly controlled by adjusting the eccentric disc.

[0009] Preferably, the bearing is a self-aligning bearing, and the spline rotating shaft passes through the self-aligning bearing. On the one hand, the self-aligning bearing plays a role in radially supporting the rotating shaft because the dynamic eccentricity causes the axis to not be on a fixed axis during operation; on the other hand, the self-aligning bearing simulates the influence of a large amount of oil mist generated by the rolling bearing during operation on the sealing performance of the lip seal.

[0010] Preferably, an oil inlet joint is connected to the rack, an oil inlet pipe is connected to the oil inlet joint, and the other end of the oil inlet pipe is connected to a dilute oil station through an electric pump. The dilute oil station and the oil inlet joint box can be used to accurately control the parameters such as the oil inlet pressure, oil inlet temperature, oil inlet flow rate, and operation speed of the lip seal.

[0011] Preferably, an oil leakage measuring cup is installed on the lower part of the rack, and the oil leakage measuring cup is located below the lip seal. Quantitative analysis is performed through the oil leakage measuring cup.

[0012] Preferably, monitoring instruments are installed on the oil inlet pipe. The pressure and temperature of the oil pumped out of the dilute oil station are monitored through the monitoring instruments.

[0013] Preferably, an oil guide ring is installed in the rack, the oil guide ring is provided with a connecting hole, the oil guide ring is provided with an extension edge, a notch is formed in the bottom of the extension edge, and the oil leakage measuring cup is located below the notch. The leaked lubricating oil can be effectively collected to prevent splashing.

[0014] Preferably, an oil return measuring cup is arranged at the bottom of the rack. The oil return amount under different working conditions and different structures is measured by using the oil return measuring cup, and the influence of the oil return smoothness on the sealing effect of the lip seal is analyzed.

[0015] In another aspect, the application also provides a lip seal dynamic eccentricity test method, comprising the following steps:

[0016] S1, one end of the spline rotating shaft passes through the self-aligning bearing, the other end passes through the spline tooth sleeve and is connected with the eccentric disc, the output shaft of the motor is connected with the eccentric disc, the thin oil station, the electric pump and the oil inlet pipe are connected;

[0017] S2, the motor (1) rotates, and the oil inlet temperature, oil inlet pressure and oil inlet flow are recorded by the monitoring instrument;

[0018] S3, the actual oil return amount of the oil return amount cup is recorded, and the oil leakage of the oil leakage amount cup is recorded.

[0019] Preferably, the step S3 comprises recording the oil return amount and the oil leakage amount of the motor under different rotating speeds, different eccentric amounts of the eccentric disc, different temperatures, different pressures, different oil inlet joint hole diameters and different running times.

[0020] Compared with the prior art, the application has the beneficial effects: the application provides a lip seal dynamic eccentricity test device and method, considering factors such as oil temperature, oil pressure, flow, dynamic eccentricity, bearing operation, etc., the oil leakage amount under different eccentric amounts can be simulated by using the eccentric disc, the oil leakage amount under different temperatures and pressures can be simulated by the thin oil station, and the oil leakage amount under different rotating speeds can be simulated by adjusting the rotating speed of the motor, so that a comprehensive test device under the actual use condition of the product can be simulated as much as possible, and the reliability of the lip seal can be tested under various conditions.

[0021] The application has the advantages of simple structure, low cost, wide application range, etc., and can be adjusted according to the actual structure of the measured object on the basis of the application to simulate the actual use condition of the lip seal for testing at a low cost. The application is suitable for scientific research of the reliability and related parameters of the lip seal, and can be further studied by adding stress, strain and temperature sensors at the lip seal of the application, and is also suitable for brand selection test work of industrialized lip seals. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The application provides a structure schematic view of a lip seal dynamic eccentricity test device;

[0023] Figure 2 The application provides a structure schematic view of a guide oil ring.

[0024] In the figure, 1 is a motor, 2 is an eccentric disc, 3 is a spline tooth sleeve, 4 is a spline rotating shaft, 5 is an oil inlet joint, 6 is a self-aligning bearing, 7 is a lip seal, 8 is a monitoring instrument, 9 is a displacement sensor, 10 is an electric pump, 11 is a thin oil station, 12 is an oil return amount cup, 13 is an oil leakage amount cup, 14 is a guide oil ring, and 15 is a gap. DETAILED DESCRIPTION

[0025] The application will be described in detail below with reference to the drawings.

[0026] In the description of the present application, it needs to be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0027] In the description of the present application, unless otherwise specified and limited, it needs to be explained that the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be mechanical connection or electrical connection, it can be the communication inside two elements, it can be direct connection, or indirect connection through intermediate medium, and for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0028] As shown in Figure 1 The present application provides a kind of lip seal dynamic eccentric test device, including rack, motor 1, eccentric disc 2, spline tooth cover 3 and spline rotating shaft 4.The spline rotating shaft 4 is located in rack, the rack is equipped with lip seal 7, the output shaft of the motor 1 is connected with one side of the eccentric disc 2, the other side of the eccentric disc 2 is connected with spline rotating shaft 4 by spline tooth cover 3.Eccentric excitation source can be introduced using eccentric disc 2, and the theoretical eccentricity can be adjusted by replacing eccentric disc 2.Drum-shaped tooth spline pair structure on spline tooth cover 3 is used to connect spline rotating shaft 4 and eccentric disc 2, and a dynamic eccentricity that the eccentric position changes periodically in radial direction with time is generated at the installation place of lip seal 7.Dynamic eccentricity is more close to the actual working condition of lip seal 7 in running process relative to the static eccentricity simulated by installing eccentric sleeve in lip seal 7.

[0029] The bearing is installed in the rack, the spline rotating shaft 4 passes through the bearing, and the bearing functions in radial direction to support, since dynamic eccentricity is generated by eccentric disc 2, the axis of bearing is no longer fixed on the axis during operation, therefore, self-adaptive adjustment is carried out on the axis by using self-aligning bearing 6, and the influence of a large amount of oil mist generated by self-aligning bearing 6 during operation on the sealing performance of lip seal 7 is simulated.

[0030] The rack is connected with an oil inlet joint 5, the oil inlet joint 5 is connected with an oil inlet pipe, the other end of the oil inlet pipe is connected with a thin oil station 11 through an electric pump 10, and a monitoring instrument 8 is installed on the oil inlet pipe. The oil inlet pipe can be changed to different aperture, the oil inlet pipe combines the temperature and pressure adjustment function of the thin oil station 11, accurately controls the oil inlet flow, pressure and temperature of the lip seal 7, and can detect the oil inlet pressure, temperature and flow through the monitoring instrument 8.

[0031] The lower part of the lip seal 7 is provided with a displacement sensor 9 connected with a controller for measuring the actual eccentricity of the lip seal. The actual eccentricity of the lip seal 7 during operation is measured and recorded in real time through the displacement sensor 9, and can be adjusted by replacing the eccentric disc 2 as needed.

[0032] The lower part of the rack is provided with an oil leakage measuring cup 13 located below the lip seal 7, which can accurately control the oil leakage under each working condition. The bottom of the rack is provided with an oil return measuring cup 12 for measuring the oil return under different conditions and structures, which is convenient for analyzing the influence of oil return smoothness on the sealing effect of the lip seal 7. After the lubricating oil passes through the test device, it is connected to the oil collection tank and flows back to the oil tank of the thin oil station 11 through the electric pump 10.

[0033] The rack is provided with an oil guide ring 14, the oil guide ring 14 is provided with a connecting hole, the oil guide ring 14 is provided with an extension edge, the bottom of the extension edge is provided with a notch 15, and the oil leakage measuring cup 13 is located below the notch 15. The oil guide ring 14 can effectively collect the leaked lubricating oil to prevent it from splashing everywhere.

[0034] On the other hand, the application also provides a test method for dynamic eccentricity test of the lip seal 7, which comprises the following steps:

[0035] S1, one end of the spline rotating shaft 4 passes through the self-aligning bearing 6, the other end passes through the spline tooth sleeve 3 and is connected with the eccentric disc 2, the output shaft of the motor 1 is connected with the eccentric disc 2, the thin oil station 11 and the electric pump 10 are connected with the oil inlet pipe;

[0036] S2, the motor 1 rotates, and the oil inlet temperature, oil inlet pressure and oil inlet flow are recorded through the monitoring instrument 8;

[0037] S3, the actual oil return amount of the oil return measuring cup 12 is recorded, and the oil leakage of the oil leakage measuring cup 13 is recorded.

[0038] The step S3 comprises recording the oil return amount and oil leakage amount of the motor 1 under different rotating speeds, different eccentric discs 2 with different eccentric amounts, different temperatures, different pressures, different aperture of the oil inlet joint 5 and different running times.

[0039] The same type of lip seal 7 is used to complete the parameter test experiment, and the influence of various factors on the performance of the lip seal 7 is studied. The relevant parameters are as follows:

[0040] 1. The motor 1 controls the rotating speed of the spline shaft 4 to be 400 r / min, 600 r / min, 800 r / min, and 1000 r / min, respectively.

[0041] 2. By replacing the eccentric disc 2, the theoretical dynamic eccentricity is controlled to be 0.2 mm, 0.5 mm, 0.8 mm, and 1.0 mm, respectively.

[0042] 3. Through the heater of the thin oil station 11, the oil inlet temperature is controlled to be 20℃, 40℃, and 60℃, respectively.

[0043] 4. Through the overflow valve of the thin oil station 11, the oil inlet pressure is controlled to be 0.2 MPa, 0.35 MPa, and 0.5 MPa, respectively.

[0044] 5. By changing the throttle orifice diameter of the oil inlet joint 5, it is φ2 mm, φ4 mm, and φ6 mm, respectively.

[0045] 6. The running time of each working condition is 10 min, 30 min, 60 min, and 120 min, respectively.

[0046] Through the above orthogonal parameters, a series of working condition running tables are obtained, and tests are carried out under each working condition respectively. Each parameter is recorded.

[0047] 1. The actual oil inlet temperature, oil inlet pressure, and oil inlet flow value are recorded by the monitoring instrument 8.

[0048] 2. The actual eccentricity value under each working condition is recorded by the displacement sensor 9.

[0049] 3. The actual oil return amount on the side of the lip seal 7 is recorded by the oil return amount cup 12.

[0050] 4. The leakage amount of the lip seal 7 is observed and recorded by the oil leakage amount cup 13.

[0051] Finally, the data is analyzed, the oil leakage and oil return flow under each working condition are compared, and the correlation with the rotating speed, oil inlet flow, pressure, and temperature is analyzed. The influence of each parameter on the sealing effect of the lip seal 7 is analyzed, and targeted adjustment and optimization are carried out on the product.

[0052] For example, it is understood that the actual running speed of a certain product is 1500 r / min, the oil inlet pressure is 0.5 MPa, the oil inlet temperature is 50℃, the bearing oil inlet throttle orifice diameter is φ5, and the eccentricity is about 0.5 mm. Test whether the lip seal 7 has oil leakage under the above working conditions;

[0053] 1. According to the requirements of the test device, the relevant equipment such as the thin oil station 11 is coupled, wherein the radial runout of the installation front alignment bearing 6 is found and the inner hole of the bearing seat is installed in the output flange of the variable frequency drive motor 1.

[0054] 2. Adjust the variable frequency drive motor 1 to control the rotating speed of the spline shaft 4 to be 1500r / min.

[0055] 3. By replacing the eccentric disc 2, the theoretical dynamic eccentricity is controlled to be 0.5mm, and the test operation is carried out at 1500r / min, the actual eccentricity is observed through the displacement sensor 9, and the actual eccentricity is adjusted to be about 0.5mm by replacing the eccentric disc 2.

[0056] 4. The heater of the thin oil station 11 is used to control the oil inlet temperature to be 50℃, and the overflow valve of the thin oil station 11 is used to control the oil inlet pressure to be 0.5Mpa.

[0057] 5. The throttle aperture of the oil inlet joint 5 is controlled to be φ5mm.

[0058] 6. Under the above working conditions, different brands and different types of lip seals 7 are tested under the same conditions.

[0059] The seals of the brands and specifications that do not leak under the above working conditions are selected; if all of them leak to a certain extent, the seal brand with the least leakage amount is preferred under the same running time, and structure optimization and brand expansion are carried out; if multiple lip seals 7 do not leak, the test time can be extended to test the reliability of each lip seal 7.

[0060] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A dynamic eccentricity testing device for lip seals, characterized in that, The system includes a frame, a motor (1), an eccentric disk (2), a spline sleeve (3), and a spline rotating shaft (4). The spline rotating shaft (4) is located inside the frame. A lip seal (7) is provided on the frame. The output shaft of the motor (1) is connected to one side of the eccentric disk (2), and the other side of the eccentric disk (2) is connected to the spline rotating shaft (4) through the spline sleeve (3). A bearing is installed inside the frame, and the spline rotating shaft (4) passes through the bearing. A displacement sensor (9) is installed at the lower part of the lip seal (7). The displacement sensor (9) is connected to a controller and is used to measure the lip seal. The actual eccentricity of the seal; an oil inlet connector (5) is connected to the frame, an oil inlet pipe is connected to the oil inlet connector (5), and the other end of the oil inlet pipe is connected to the thin oil station (11) through an electric pump (10); an oil leakage measuring cup (13) is installed at the lower part of the frame, and the oil leakage measuring cup (13) is located below the lip seal (7); an oil guide ring (14) is installed inside the frame, the oil guide ring (14) is provided with a connecting hole, the oil guide ring (14) is provided with an extension edge, and a notch (15) is opened at the bottom of the extension edge, and the oil leakage measuring cup (13) is located below the notch (15).

2. The dynamic eccentricity testing device for lip seals according to claim 1, characterized in that, The bearing is a self-aligning bearing (6), and the spline rotating shaft (4) passes through the self-aligning bearing (6).

3. The dynamic eccentricity testing device for lip seals according to claim 1, characterized in that, The oil inlet pipe is equipped with a monitoring instrument (8).

4. The dynamic eccentricity testing device for lip seals according to claim 1, characterized in that, The bottom of the frame is equipped with an oil return measuring cup (12).

5. The test method of the dynamic eccentricity test device for lip seals according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Pass one end of the spline rotating shaft (4) through the self-aligning bearing (6) and the other end through the spline gear sleeve (3) to connect with the eccentric disk (2). Connect the output shaft of the motor (1) to the eccentric disk (2). Connect the thin oil station (11), the electric pump (10) to the oil inlet pipe. S2, the motor (1) rotates, and the oil inlet temperature, oil inlet pressure and oil inlet flow are recorded by the monitoring instrument (8); S3. Record the actual oil return volume of the return oil measuring cup (12) and record the oil leakage situation of the leakage oil measuring cup (13).

6. The test method according to claim 5, characterized in that, Step S3 includes recording the oil return and leakage of the motor (1) under different speeds, different eccentricity of the eccentric disk (2), different temperatures, different pressures, different oil inlet connector (5) orifice diameters, and different running times.

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