Oil seal airtightness testing mechanism
By designing an oil seal air tightness testing mechanism that combines side inflation and O-rings, the problem of misjudgment of sealing performance as pressure increases in existing testing methods has been solved, achieving more accurate oil seal air tightness testing.
Patent Information
- Application Number
- CN202520319363.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Existing oil seal air tightness testing methods show that the test results decrease as the inflation pressure increases within the inflation range, making it impossible to accurately characterize the sealing effect of the oil seal.
An oil seal air tightness testing mechanism was designed. It adopts a side-filling method and forms a sealed cavity through a combination of a sealing cavity and an O-ring. Leakage detection fixtures and leak detection instruments are used to monitor the gas pressure difference or gas flow rate, thereby improving the sensitivity and accuracy of the test.
It can more sensitively characterize the airtightness of oil seals, avoiding the misjudgment that the sealing performance improves with increasing pressure in existing testing methods, thus improving the accuracy and precision of the test.
Smart Images
Figure CN223664202U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to oil seal detection technical field especially relates to a kind of oil seal air-tight test mechanism. BACKGROUND
[0002] Rubber seal industry carries out air-tight test to finished product, and it is the necessary procedure to verify whether product is sealed qualified or not, whether air-tight test method is reasonable and scientific determines whether the result of leakage test can be more accurate, oil seal works because of interference fit between main lip and transmission shaft, and it has the effect of pressure-resistant oil sealing, and after long-time wear, it can also rely on the radial holding force generated by spring, can continuously compensate, prolong the service life of oil seal, air-tight test of oil seal is a kind of detection method simulating the assembly environment of oil seal, using gas instead of liquid, currently, differential pressure method is mostly used.
[0003] The existing test method generally simulates the use state of oil seal under assembly condition, charges air on the side with oil to simulate oil pressure on product, air-tight shaft seals oil seal lip, outer tool seals the outer ring of product, forms a sealed cavity between the inner side of lip and outer ring, charges air in the cavity to pressurize, detects the leakage speed of gas to evaluate the air-tight performance of product.
[0004] By using the existing leakage test method, it is known that, within a pressure range, with the increase of charging pressure, air-tight test value will decrease, this result cannot reflect the real sealing condition of rubber lip, and there is a part of air-tight effect is not good, but because of the setting problem of leakage parameter value, leakage test is normal, this reason is due to the increase of charging pressure, the compression force between rubber lip and shaft becomes larger, and air-tight effect becomes better, and the present designed charging mode is to improve the air-tight detection which is not sensitive enough, so that the air-tight test result of product is only related to the sealing performance of product.
[0005] In summary, within a charging range, the test result of oil seal air-tightness will decrease with the increase of charging pressure, which cannot well represent the sealing effect of oil seal. UTILITY MODEL CONTENTS
[0006] In order to overcome the defects of the prior art as pointed out above, the present inventors have conducted in-depth research, and after a lot of creative labor, the present utility model is completed.
[0007] Specifically, the technical problem to be solved by the utility model is to provide an oil seal air-tight test mechanism to solve the technical problem that the test result of oil seal air-tightness within a charging range will decrease with the increase of charging pressure, and the sealing effect of oil seal cannot be well represented.
[0008] To solve the above technical problems, the utility model provides the following technical scheme:
[0009] An oil seal air tightness test mechanism, including air tightness upper tool, air tightness lower tool located in the bottom of air tightness upper tool, the inside installation of air tightness lower tool has air tightness axle, the inside installation of air tightness upper tool has locating column, the locating column is located in the top of air tightness axle, the outer surface of air tightness axle is installed with oil seal, the inside installation of air tightness lower tool has oil seal spring, the oil seal spring is located in the inner side of oil seal, and it is abutted, the inside installation of air tightness lower tool has first O type ring, and the first O type ring is located in the bottom of oil seal, the inside installation of air tightness upper tool has third O type ring, and the third O type ring is located in the top of oil seal, when the oil seal is installed on air tightness axle, and the bottom of oil seal is contacted with first O type ring, the sealed cavity is formed between oil seal lip and air tightness axle and first O type ring.
[0010] As an improved technical scheme, one side of the sealed cavity is fixedly connected with an inflation hole, and the other end of the inflation hole is fixedly connected with a leakage detection tool, and the leakage detection tool is located in the inside of the air tightness axle.
[0011] As an improved technical scheme, the first O type ring is located at the top of the air tightness lower tool and the outside of the air tightness axle.
[0012] As an improved technical scheme, the third O type ring is located at the bottom of the air tightness upper tool.
[0013] As an improved technical scheme, the inside of the air tightness lower tool is further provided with a second O type ring, the second O type ring is located at the bottom of the first O type ring, and the second O type ring is located at the bottom of the air tightness axle.
[0014] After adopting the above technical scheme, the utility model has the beneficial effects that:
[0015] 1. The utility model discloses a side inflation mode, which can more sensitively represent the air tightness effect of the oil seal, and when the holding force of the product lip changes, the change can also be well represented from the air tightness test result, thereby avoiding the problem that the existing air tightness test is not sensitive enough.
[0016] 2. The utility model discloses that with the increase of inflation pressure, the sealing property of the oil seal lip and the air tightness axle is broken by the air pressure, so that the oil seal lip moves to the oil seal spring direction with the increase of pressure, and deformation is generated, thereby causing leakage, and the phenomenon that the air tightness becomes better with the increase of air pressure is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0018] Figure 1 It is a whole structure schematic view of the oil seal air tightness testing mechanism of the present application.
[0019] Figure 2 It is the A part enlarged structure schematic view of the oil seal air tightness testing mechanism of the present application. Figure 1
[0020] Mark explanation:
[0021] 1, air tightness upper tooling; 2, air tightness lower tooling; 3, air tightness shaft; 4, first O ring; 5, second O ring; 6, third O ring; 7, positioning column; 8, oil seal; 9, oil seal spring; 10, sealing cavity; 11, inflation hole; 12, leakage detection tooling. Specific implementation
[0022] The technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.
[0024] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes are satisfied at the same time.
[0025] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.
[0026] As Figures 1 to 2 As shown in the drawings, the present embodiment provides an oil seal air tightness test mechanism, which comprises an air tightness upper tool 1, an air tightness lower tool 2 located at the bottom of the air tightness upper tool 1, an air tightness shaft 3 installed inside the air tightness lower tool 2, a positioning column 7 installed inside the air tightness upper tool 1, the positioning column 7 located at the top of the air tightness shaft 3, an oil seal 8 installed on the outer surface of the air tightness shaft 3, an oil seal spring 9 installed inside the air tightness lower tool 2, the oil seal spring 9 located inside the oil seal 8 and abutting with it, and the oil seal spring 9 located inside the oil seal 8 lip;
[0027] A first O-ring 4 is installed inside the air tightness lower tool 2, the first O-ring 4 is located at the bottom of the oil seal 8, a third O-ring 6 is installed inside the air tightness upper tool 1, the third O-ring 6 is located at the top of the oil seal 8, when the oil seal 8 is installed on the air tightness shaft 3 and the bottom of the oil seal 8 contacts with the first O-ring 4, a sealed cavity 10 is formed between the oil seal 8 lip and the air tightness shaft 3 and the first O-ring 4, the oil seal 8 product is placed on the air tightness lower tool 2, the air tightness upper tool 1 relies on the third O-ring 6 to press the oil seal 8, the air tightness shaft 3 contacts with the product lip, the first O-ring 4 contacts with the bottom of the oil seal 8, and the two contact positions form the sealed cavity 10, so as to inflate the air side of the oil seal 8 in use, which can more sensitively characterize the air tightness effect of the oil seal 8, and when the holding force of the product lip changes, it can also be well characterized from the air tightness test result, avoiding the problem that the existing air tightness test is not sensitive enough.
[0028] One side of the sealed cavity 10 is fixedly connected with an inflation hole 11, the other end of the inflation hole 11 is fixedly connected with a leakage detection tool 12, the leakage detection tool 12 is located inside the air tightness shaft 3, the leakage detection tool 12 is installed inside the air tightness shaft 3, which can make the test environment more airtight, reduce external interference, and improve the accuracy and precision of the test, such as Figure 1As shown, the bottom of the leakage detection tool 12 is connected with a pipeline, and is connected with a leakage detector through the pipeline, and the leakage detection tool 12 is used in cooperation with the leakage detector, and in the detection process, the two are connected, so as to form a closed test environment, and the leakage detector judges the air tightness of the measured oil seal 8 by monitoring the air pressure difference or the gas flow and the like, and outputs the test result.
[0029] The first O-ring 4 is located at the top of the air-tight lower tool 2 and outside the air-tight shaft 3, so as to facilitate the sealing operation on the bottom of the oil seal 8.
[0030] The third O-ring 6 is located at the bottom of the air-tight upper tool 1, so as to facilitate the positioning of the top of the oil seal 8 and at the same time play a sealing effect.
[0031] The second O-ring 5 is further installed in the air-tight lower tool 2, and the second O-ring 5 is located at the bottom of the first O-ring 4 and at the bottom of the air-tight shaft 3, the second O-ring 5 can tightly clamp the bottom of the air-tight shaft 3 and tightly adhere to the sealing part of the measured product, so as to form a more tight sealing effect, improve the accuracy and reliability of the air tightness test of the measured product, and the O-ring can reduce the friction between the bottom of the air-tight shaft 3 and the air-tight lower tool 2, so as to reduce the friction loss in the whole air tightness test process and improve the service life of the test device.
[0032] In use, the air-tight lower tool 2 is lifted to fix the oil seal 8 to the air-tight shaft 3 and the air-tight lower tool 2, the air-tight upper tool 1 is pressed down to make the positioning column 7 contact with the air-tight shaft 3 and fix the air-tight shaft 3 through the second O-ring 5, the oil seal 8 lip is completely contacted with the air-tight shaft 3 under the restraint of the oil seal spring 9, at the same time, the bottom of the oil seal 8 is located on the surface of the first O-ring 4, and the top of the oil seal 8 is pressed by the third O-ring 6, that is, the sealing cavity 10 is formed, and then the leakage detector is started to send the gas to the inside of the sealing cavity 10 through the inflation hole 11 and the leakage detection tool 12, so as to obtain the detection result.
[0033] With the increase of the inflation pressure, the air tightness of the oil seal 8 lip and the air-tight shaft 3 will be broken by the air pressure, the oil seal 8 lip moves to the oil seal spring 9 direction with the increase of the pressure, and the oil seal 8 lip is deformed, thereby causing the leakage, and the phenomenon that the air tightness becomes better with the increase of the air pressure is avoided.
[0034] It should be understood that the use of these embodiments is only for the purpose of illustrating the present application and is not intended to limit the protection scope of the present application. In addition, it should also be understood that after reading the technical content of the present application, those skilled in the art can make various modifications, modifications and / or variations to the present application, and all these equivalent forms also fall within the protection scope defined by the appended claims of the present application.
Claims
1. An oil seal airtightness testing mechanism, comprising an upper airtightness fixture (1) and a lower airtightness fixture (2) located at the bottom of the upper airtightness fixture (1), characterized in that: An airtight shaft (3) is installed inside the airtight lower fixture (2), a positioning column (7) is installed inside the airtight upper fixture (1), the positioning column (7) is located at the top of the airtight shaft (3), an oil seal (8) is installed on the outer surface of the airtight shaft (3), an oil seal spring (9) is installed inside the airtight lower fixture (2), the oil seal spring (9) is located inside the oil seal (8) and abuts against it; The lower airtight fixture (2) is equipped with a first O-ring (4) located at the bottom of the oil seal (8). The upper airtight fixture (1) is equipped with a third O-ring (6) located at the top of the oil seal (8). When the oil seal (8) is installed on the airtight shaft (3) and the bottom of the oil seal (8) is in contact with the first O-ring (4), a sealed cavity (10) is formed between the lip of the oil seal (8), the airtight shaft (3), and the first O-ring (4).
2. The oil seal airtightness testing mechanism according to claim 1, characterized in that: An air inlet (11) is fixedly connected to one side of the sealed cavity (10), and a leakage detection fixture (12) is fixedly connected to the other end of the air inlet (11). The leakage detection fixture (12) is located inside the airtight shaft (3).
3. The oil seal airtightness testing mechanism according to claim 2, characterized in that: The first O-ring (4) is located on top of the airtight tooling (2) and outside the airtight shaft (3).
4. The oil seal airtightness testing mechanism according to claim 3, characterized in that: The third O-ring (6) is located at the bottom of the airtight upper tooling (1).
5. The oil seal airtightness testing mechanism according to claim 4, characterized in that: The airtight tooling (2) is also equipped with a second O-ring (5), which is located at the bottom of the first O-ring (4) and at the bottom of the airtight shaft (3).