Oil seal positive and negative pressure test device

Abstract

The utility model belongs to the technical field of oil seal tests, and discloses an oil seal positive and negative pressure test device, which can form a closed air pressure environment around an oil seal through cooperation of an oil seal test assembly and a pressure regulation assembly so as to simulate positive and negative pressure states possibly experienced by an automobile in a driving process. The simulation environment enables the test to accurately reflect the performance of the oil seal under the actual working condition; the oil seal is detachably embedded in the center position of the test disc, the rotating shaft is arranged in the oil seal in a penetrating mode, the rotating shaft can rotate along the central axis of the rotating shaft, and the working state of dynamic sealing between the oil seal and the rotating shaft is simulated; two independent closed cavities are defined by the oil seal, the first shell, the second shell and the test disc, liquid is injected into the designated closed cavities, and the states of the oil seal on the oil side and the air side under the actual working condition can be simulated; the dynamic sealing effect of the oil seal under the positive and negative pressure conditions can be evaluated by utilizing the pressure adjusting effect of the pressure adjusting assembly on the pressure in the closed cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seal testing, in particular to an oil seal positive and negative pressure testing device. Background Art

[0002] During vehicle operation, positive or negative pressure may be generated within the cavity where the oil seal is mounted. When positive pressure exists within the cavity, the holding force of the oil seal lip increases, exacerbating lip wear and causing oil seal leakage. Conversely, when negative pressure exists within the cavity, the holding force of the oil seal lip decreases, resulting in a decrease in sealing performance and, similarly, causing leakage.

[0003] However, existing technologies typically focus on leak detection under normal operating conditions. Traditional testing methods often rely on static pressure testing, primarily verifying the seal's sealing performance by applying a fixed pressure. However, these methods are limited in their ability to handle the dynamic pressure fluctuations experienced during vehicle operation, and are unable to fully simulate the effects of positive or negative pressure on the seal lip. Utility Model Content

[0004] The purpose of the utility model is to provide an oil seal positive and negative pressure test device, which can simulate the pressure state of positive and negative air pressure during automobile driving, effectively test the performance of the oil seal under positive and negative pressure states, and thus accurately evaluate the performance of the oil seal under different pressures.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] The oil seal positive and negative pressure test device is used to test the performance of the oil seal under positive and negative pressure conditions, wherein the oil seal positive and negative pressure test device includes:

[0007] An oil seal test assembly comprising a first housing, a second housing, and a test disc, one side of the test disc being connected to the first housing, and the other side of the test disc being connected to the second housing. The oil seal is detachably embedded in the center of the test disc, and a rotating shaft is provided within the oil seal, capable of rotating along its central axis. The oil seal, the first housing, and the test disc together form a closed, hollow first cavity, and the oil seal, the second housing, and the test disc together form a closed, hollow second cavity. Both the first cavity and the second cavity are capable of containing liquid.

[0008] A pressure regulating assembly is connected to the second shell to regulate the pressure inside the second shell.

[0009] Furthermore, the oil seal test assembly further includes a liquid injection tube, which can be selectively connected to the first shell or the second shell and is used to inject liquid into the first shell or the second shell.

[0010] Furthermore, a developer is provided in the liquid injected by the liquid injection tube.

[0011] Furthermore, the first shell, the second shell and the test disc are all detachably connected.

[0012] Furthermore, the oil seal and the test disc are interference fit.

[0013] Furthermore, a transparent observation plate is provided on a side of the second housing opposite to the oil seal.

[0014] Furthermore, the pressure regulating assembly includes a pressure regulating member, one end of the pressure regulating member is connected to the output end of the air pressure source, and the other end of the pressure regulating member is connected to the second shell.

[0015] Furthermore, the pressure regulating assembly further includes a pressure detecting component, which is connected to the second shell to detect pressure changes in the second cavity.

[0016] Furthermore, the pressure regulating assembly further includes a connecting pipe, and the pressure regulating assembly and the oil seal testing assembly can be connected through the connecting pipe.

[0017] Furthermore, the pressure regulating assembly also includes a sealing joint, one end of which is connected to one end of the connecting pipe, and the other end of each sealing joint is respectively connected to the oil seal test assembly or the pressure regulating assembly to ensure the stability of the connection of the connecting pipe.

[0018] Beneficial effects of the utility model:

[0019] The utility model provides an oil seal positive and negative pressure test device. Through the coordinated cooperation of an oil seal test assembly and a pressure regulating assembly, a closed air pressure environment can be formed around the oil seal to simulate the positive and negative pressure conditions that a car may experience during driving. This simulated environment enables the test to accurately reflect the performance of the oil seal under actual working conditions. The oil seal is detachably embedded in the center position of a test disc, and a rotating shaft is passed through the oil seal. The rotating shaft can rotate along its central axis, thereby simulating the working state of the dynamic seal between the oil seal and the rotating shaft in actual application. The sealing performance changes of the oil seal caused by the rotating shaft in positive and negative pressure environments can be dynamically evaluated. At the same time, the detachable design facilitates the tester to change the orientation of the oil side and the air side of the oil seal according to test requirements. Two independent closed cavities, namely the first cavity and the second cavity, are enclosed by a first shell, a second shell, and a test disc. Both cavities can accommodate liquids, thereby simulating the oil side and air side conditions of the oil seal under actual working conditions. The pressure regulating function of the pressure regulating assembly in the closed cavity can evaluate the sealing effect of the oil seal under pressure fluctuation conditions. Therefore, the oil seal positive and negative pressure test device can simulate the positive and negative pressure states during automobile driving, effectively test the performance of the oil seal under positive and negative pressure states, and thus accurately evaluate the performance of the oil seal under different pressures. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a connection diagram of the oil seal positive and negative pressure test device of the utility model;

[0021] Figure 2 It is a cross-sectional view of the oil seal test assembly in the utility model.

[0022] In the picture:

[0023] 100. Oil seal;

[0024] 1. Oil seal test assembly; 11. First housing; 12. Second housing; 13. Test tray; 14. Observation panel;

[0025] 2. Pressure regulating assembly; 21. Pressure regulating part; 22. Pressure detecting part; 23. Connecting pipe; 24. Sealing joint. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0027] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0028] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0029] In the description of this embodiment, the terms "upper," "lower," "left," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0030] Please refer to Figures 1 to 2The utility model provides an oil seal positive and negative pressure test device, which can simulate the positive and negative pressure states during the driving of a car, effectively test the performance of the oil seal 100 under positive and negative pressure states, and thus accurately evaluate the performance of the oil seal 100 under different pressures. The oil seal positive and negative pressure test device is used to test the performance of an oil seal 100 under positive and negative pressure conditions, and includes an oil seal test assembly 1 and a pressure regulating assembly 2, wherein the oil seal test assembly 1 includes a first shell 11, a second shell 12 and a test disc 13, one side of the test disc 13 is connected to the first shell 11, and the other side of the test disc 13 is connected to the second shell 12, the oil seal 100 is detachably embedded in the center position of the test disc 13, and a rotating shaft is passed through the inside of the oil seal 100, and the rotating shaft can rotate along its central axis; the oil seal 100, the first shell 11 and the test disc 13 enclose a closed hollow first cavity, and the oil seal 100, the second shell 12 and the test disc 13 enclose a closed hollow second cavity, both of which can accommodate liquid; the pressure regulating assembly 2 is connected to the second shell 12 to adjust the pressure inside the second shell 12.

[0031] By cooperating with the oil seal 100 test assembly and the pressure regulating assembly 2, a closed air pressure environment can be formed around the oil seal 100 to simulate the positive and negative pressure conditions that a car may experience during driving. This simulated environment enables the test to accurately reflect the performance of the oil seal 100 under actual working conditions. By detachably embedding the oil seal 100 in the center of the test disc 13, a rotating shaft is provided inside the oil seal 100, and the rotating shaft can rotate along its central axis, the working state of the dynamic seal between the oil seal 100 and the rotating shaft in actual application is simulated, and the performance of the oil seal 100 under positive and negative pressure conditions can be dynamically evaluated. The detachable design allows testers to change the orientation of the oil and air sides of the oil seal 100 according to test requirements. The first housing 11, the second housing 12, and the test disc 13 form two independent closed cavities, namely the first cavity and the second cavity. Both cavities can contain liquids, simulating the oil and air side conditions of the oil seal 100 under actual working conditions. By utilizing the pressure regulating assembly 2 to regulate the pressure in the closed cavity, the sealing effect of the oil seal 100 under pressure fluctuations can be evaluated. Therefore, the oil seal positive and negative pressure test device can simulate the positive and negative pressure conditions during vehicle driving, effectively testing the performance of the oil seal 100 under positive and negative pressure conditions, and thus accurately evaluating the performance of the oil seal 100 under different pressures. Specifically, the rotating shaft is connected to the main shaft of the oil seal positive and negative pressure test device, and the main shaft is driven by a drive motor to drive the rotating shaft to rotate along its central axis.

[0032] To facilitate the injection of liquid into the sealed cavity, in some embodiments, the oil seal testing assembly 1 further includes an injection tube, which can be selectively connected to the first housing 11 or the second housing 12 and used to inject liquid into the first housing 11 or the second housing 12. The injection tube provides a convenient way to inject liquid into the first housing 11 or the second housing 12, and also allows for convenient addition or replacement of liquid before or during testing, making the testing process more flexible and efficient. Specifically, the liquid injected by the injection tube contains a developer. By adding the developer, the operator can observe whether the cavity (not filled with liquid) shows a developing reaction to determine whether the oil seal 100 is leaking. The developer makes leaks easier to detect, helping the operator detect minor leaks or insufficient sealing. The injected liquid can be, but is not limited to, lubricating oil, and is not specifically limited here. Furthermore, the developer can be, but is not limited to, a fluorescent developer, and is not specifically limited here. If a fluorescent developer is used, the tester can illuminate the cavity (not filled with liquid) with a UV lamp after the test to determine whether the oil seal 100 is leaking by observing the fluorescent reaction within the cavity.

[0033] like Figure 2 As shown, in some embodiments, the first shell 11, the second shell 12 and the test disc 13 can be detachably connected; the detachable design between the components allows each component to be individually disassembled and inspected, facilitating maintenance and repair; during the test process, liquids or developers may adhere to the components, and the detachable design facilitates thorough cleaning of each part, ensuring that the device remains in good working condition; it also facilitates the loading and unloading of the oil seal 100. Specifically, the first shell 11, the second shell 12 and the test disc 13 can be fastened together at the connection point by a plurality of bolts that are evenly spaced and distributed circumferentially. The use of bolts to fasten the first shell 11 and the second shell 12 to the test disc 13 can ensure that these components remain stable during the test, improve the sealing of the first cavity and the second cavity, and reduce possible leakage or poor sealing problems. At the same time, the test personnel can quickly complete the installation or disassembly of the components by tightening or loosening the bolts to perform maintenance, adjustment or replacement of the test components. In other embodiments, the first shell 11, the second shell 12 and the test disc 13 can also be fastened together by a clamp.

[0034] In some embodiments, the oil seal 100 and the test disc 13 are interference fit, and the interference fit ensures close contact between the oil seal 100 and the test disc 13. The interference fit allows the oil seal 100 to exert a certain pressure on the contact surface, which can avoid the existence of a gap between the oil seal 100 and the test disc 13, thereby avoiding leakage of liquid or gas and affecting the pressure changes in the cavity and the test results.

[0035] like Figure 1As shown, to facilitate direct observation of the oil seal 100 during testing by the operator, in some embodiments, a transparent observation panel 14 is provided on the side of the second housing 12 opposite the oil seal 100. This transparent observation panel 14 allows for clear and direct observation of the specific operating performance of the oil seal 100 under positive and negative pressure conditions. This not only enhances the ability to monitor the performance of the oil seal 100 in real time, but also eliminates the tedious steps of indirect evaluation that previously required the use of other observation tools or equipment. Furthermore, this transparent panel design prevents direct contact between the operator and the internal pressure environment, improving safety during the test and making the test operation more convenient and efficient. Specifically, the observation panel is fastened to the second housing via multiple bolts.

[0036] like Figure 1 As shown, in some embodiments, the pressure regulating assembly 2 includes a pressure regulating member 21, one end of which is connected to the output end of the air pressure source, and the other end of the pressure regulating member 21 is connected to the second housing 12. Connecting one end of the pressure regulating member 21 to the air pressure source facilitates centralized pressure control and simplifies the pressure regulation process. The operator can directly adjust the output of the air pressure source through the pressure regulating member 21, thereby achieving precise pressure control. By connecting the other end of the pressure regulating member 21 to the second housing 12, the pressure of the second cavity can be regulated, thereby simulating different test requirements and conditions. The pressure regulating member 21 can be, but is not limited to, a pressure regulating valve or a pneumatic pressure regulator, etc., which is not specifically limited here.

[0037] In order to detect the internal pressure of the oil seal test assembly 1, in some embodiments, the pressure regulating assembly 2 also includes a pressure detection member 22, which is connected to the second shell 12 to detect pressure changes in the second cavity. The pressure detection member 22 can monitor the pressure inside the second cavity in real time, provide an intuitive pressure display or indication, and provide instant pressure data, which helps the operator understand the current test conditions and make necessary adjustments. The pressure detection member 22 verifies the adjustment effect of the pressure regulating member 21, ensuring that the test is performed within the correct pressure range, thereby improving the accuracy of the test results. The pressure detection member 22 can be configured as a pressure gauge, a pressure switch, or a pressure sensor, and can be adjusted according to actual test needs, which is not specifically limited here.

[0038] In some embodiments, the pressure regulating assembly 2 also includes a connecting pipe 23, and the pressure regulating assembly 2 and the oil seal test assembly 1 can be connected through the connecting pipe 23; by using the connecting pipe 23, the connection between the pressure regulating assembly 2 and the oil seal test assembly 1 can be more flexible, and the connection method can be adjusted according to different test requirements; at the same time, connecting through the connecting pipe 23 instead of directly connecting the components can effectively reduce the risk of pressure leakage at the connection, thereby improving the safety of the oil seal positive and negative pressure test device.

[0039] like Figure 1 As shown, specifically, the pressure regulating assembly 2 also includes a sealing joint 24, one end of the sealing joint 24 is connected to one end of the connecting pipe 23, and the other end of the sealing joint 24 is respectively connected to the oil seal test assembly 1 or the pressure regulating assembly 2 to ensure the stability of the connection of the connecting pipe 23; by adding a sealing joint 24 between the connecting pipe 23 and each component, it is possible to effectively prevent gas or liquid from leaking at the connection, maintain the pressure in the pressure regulating assembly 2 and the oil seal test assembly 1, avoid pressure loss due to leakage, and ensure the stability of pressure during the test and the accuracy of test data; at the same time, the sealing joint 24 provides a stable connection point, ensuring a stable connection between the connecting pipe 23 and the pressure regulating assembly 2 and the oil seal test assembly 1, reducing loosening or even falling off of the connection due to vibration or operation, and protecting the safety of equipment and operators.

[0040] It should be noted that, generally, those skilled in the art define the side of the oil seal 100 facing the air or the external environment as the air side of the oil seal 100 , and define the side of the oil seal 100 facing the liquid (e.g., lubricating oil) as the oil side of the oil seal 100 .

[0041] The following is the test operation process of the positive and negative pressure test device:

[0042] When the operator performs a positive pressure test on the oil seal 100:

[0043] First, the operator removably inserts the oil seal 100 into the center of the test disc 13. A rotating shaft is provided inside the oil seal 100, which can rotate along its central axis. Ensure that the oil seal 100 is securely inserted. The oil side of the oil seal 100 faces the second housing 12, and the air side of the oil seal 100 faces the first housing 11.

[0044] Afterwards, liquid is added into the second cavity;

[0045] Then, connect one end of the pressure regulating assembly 2 to the output end of the air pressure source, and the other end to the second housing 12;

[0046] After ensuring that all components of the oil seal positive and negative pressure test device are in good condition and correctly installed, apply positive air pressure to the second housing 12 through the pressure regulating assembly 2 and observe the actual pressure value of the pressure detection component 22 to ensure that the positive pressure value displayed by the pressure detection component 22 meets the test requirements;

[0047] Finally, after the test is completed, the tester observes whether there is any liquid leakage inside the first shell 11 and records the test results.

[0048] When the operator performs a negative pressure test on the oil seal 100:

[0049] First, the operator removably inserts the oil seal 100 into the center of the test disc 13. A rotating shaft is provided inside the oil seal 100, which can rotate along its central axis. Ensure that the oil seal 100 is securely inserted. The air side of the oil seal 100 faces the second housing 12, and the oil side of the oil seal 100 faces the first housing 11.

[0050] Afterwards, liquid is added into the first cavity;

[0051] Then, connect one end of the pressure regulating assembly 2 to the output end of the air pressure source, and the other end to the second housing 12;

[0052] After ensuring that all components of the oil seal positive and negative pressure test device are in good condition and correctly installed, apply negative air pressure to the second housing 12 through the pressure regulating assembly 2 and observe the actual pressure value of the pressure detection component 22 to ensure that the negative pressure value displayed by the pressure detection component 22 meets the test requirements;

[0053] Finally, after the test is completed, the tester observes whether there is any liquid leakage inside the second shell 12 and records the test results.

[0054] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. An oil seal positive and negative pressure test device, used to test the performance of an oil seal (100) under positive / negative pressure conditions, characterized in that: The oil seal positive and negative pressure test device comprises: An oil seal test assembly (1) comprises a first shell (11), a second shell (12) and a test disc (13), one side of the test disc (13) being connected to the first shell (11), and the other side of the test disc (13) being connected to the second shell (12), the oil seal (100) being detachably embedded in the center of the test disc (13), a rotating shaft being provided inside the oil seal (100), and the rotating shaft being capable of rotating along its central axis; the oil seal (100), the first shell (11) and the test disc (13) enclose a closed hollow first cavity, the oil seal (100), the second shell (12) and the test disc (13) enclose a closed hollow second cavity, and both the first cavity and the second cavity are capable of containing liquid; A pressure regulating assembly (2) is connected to the second shell (12) to regulate the pressure inside the second shell (12).

2. The oil seal positive and negative pressure test device according to claim 1, characterized in that: The oil seal test assembly (1) further comprises a liquid injection pipe, which can be selectively connected to the first shell (11) or the second shell (12) and is used for injecting liquid into the first shell (11) or the second shell (12).

3. The oil seal positive and negative pressure test device according to claim 2, characterized in that: The liquid injected by the liquid injection tube contains developer.

4. The oil seal positive and negative pressure testing device according to claim 1, characterized in that: The first shell (11), the second shell (12) and the test disc (13) are all detachably connected.

5. The oil seal positive and negative pressure testing device according to claim 4, characterized in that: The oil seal (100) is interference-fitted with the test disc (13).

6. The oil seal positive and negative pressure testing device according to claim 5, characterized in that: A transparent observation plate (14) is provided on a side of the second housing (12) opposite to the oil seal (100).

7. The oil seal positive and negative pressure testing device according to claim 1, characterized in that: The pressure regulating assembly (2) comprises a pressure regulating member (21), one end of the pressure regulating member (21) is connected to the output end of the air pressure source, and the other end of the pressure regulating member (21) is connected to the second housing (12).

8. The oil seal positive and negative pressure testing device according to claim 7, characterized in that: The pressure regulating assembly (2) further comprises a pressure detecting element (22), wherein the pressure detecting element (22) is connected to the second housing (12) to detect pressure changes in the second cavity.

9. The oil seal positive and negative pressure test device according to any one of claims 1 to 8, characterized in that: The pressure regulating assembly (2) further comprises a connecting pipe (23), and the pressure regulating assembly (2) and the oil seal testing assembly (1) can be connected via the connecting pipe (23).

10. The oil seal positive and negative pressure testing device according to claim 9, characterized in that: The pressure regulating assembly (2) further comprises a sealing joint (24), one end of which is connected to one end of the connecting pipe (23), and the other end of which is connected to the oil seal test assembly (1) or the pressure regulating assembly (2), respectively, to ensure the stability of the connection of the connecting pipe (23).

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