Axial static PTFE packing cup rotary sealing performance testing device

Abstract

The utility model discloses an axial static type PTFE packing cup rotary sealing performance testing device, and belongs to the technical field of sealing tests. The driving mechanism is fixed on the bottom plate, two frame bodies are fixed on the bottom plate, a cavity is formed between the two frame bodies, the output end of the driving mechanism is coaxially and fixedly connected with the shell with the U-shaped section, the PTFE leather cup to be verified is pressed on the inner wall of the shell in an interference fit mode, the inner side of the PTFE leather cup is tightly attached to the test shaft, the rubber leather cup is pressed on the test shaft in an interference fit mode, and the rubber leather cup is fixedly connected with the shell. The inner side of the rubber cup is tightly attached to the outer wall of the shell, the test shaft is arranged in the cavity, and the outer end of the test shaft is fixedly connected with the cavity. According to the utility model, the driving mechanism drives the shell and the PTFE packing cup in the shell to rotate, and the test shaft is kept static, so that the sealing performance of the PTFE packing cup in a rotating state is accurately tested, and the test mode is closer to an actual application scene, therefore, the test result has higher reference value, and the test requirements in special application scenes such as aviation industry and the like are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of shaft static PTFE leather cup rotation sealing performance testing device, belong to sealing test technical field. BACKGROUND

[0002] In the aviation industry, as a key sealing element, the stability and reliability of the performance of polytetrafluoroethylene (PTFE) leather cup are crucial to ensure the safe operation of aviation equipment. Traditional PTFE leather cup sealing performance test is usually carried out under a standard working condition, i.e. the mating shaft rotates while the PTFE leather cup remains stationary. In this test method, the PTFE leather cup is installed on a fixed mounting seat, while the test shaft matched with it is rotated by the conventional oil seal tester driving device. The conventional oil seal tester is simple in design and can effectively simulate this rotating working condition, so that the PTFE leather cup is in direct contact with the test medium during the test, thereby evaluating its sealing performance.

[0003] However, with the continuous development of aviation technology, PTFE leather cup is required to work in a rotating state in some special application scenarios, while the mating shaft remains stationary. Sealing performance test under this special working condition is crucial to ensure the performance of PTFE leather cup in actual application. However, due to design limitations, the existing conventional oil seal tester cannot simulate this special working condition where the mating shaft is stationary while the PTFE leather cup rotates. Therefore, under the current test conditions, the sealing performance of PTFE leather cup under this special working condition cannot be effectively evaluated. SUMMARY

[0004] To solve the problems in the background art, the utility model provides a kind of shaft static PTFE leather cup rotation sealing performance testing device.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a kind of shaft static PTFE leather cup rotation sealing performance testing device, comprising a shell, a test shaft, a rubber leather cup, a driving mechanism and a cavity;The driving mechanism is fixed on the bottom plate, two frame bodies are fixed on the bottom plate, there is a cavity between the two frame bodies, the output end of the driving mechanism is coaxially fixedly connected with the shell with U-shaped cross section, the PTFE leather cup to be verified is interference fit press-fitted on the inner wall of the shell, the inner side of the PTFE leather cup is closely combined with the test shaft, the rubber leather cup is interference fit press-fitted on the test shaft, the inner side of the rubber leather cup is closely combined with the outer wall of the shell, the test shaft is arranged in the cavity and the outer end of the test shaft is fixedly connected with the cavity.

[0006] The test shaft comprises an inner shaft, a mounting ring and a connecting part, the mounting ring is fixedly connected with the cavity, the inner shaft is coaxially arranged in the mounting ring, one end of the inner shaft is fixedly connected with the mounting ring through the connecting part, the other end of the inner shaft is coaxially inserted into the shell and tightly combined with the PTFE skin bowl to be verified, and the inner wall of the mounting ring is press-fitted with the rubber skin bowl.

[0007] The outer side of the rubber skin bowl is provided with a protective tool, and the protective tool is fixedly connected with the mounting ring of the test shaft.

[0008] The protective tool is provided with a through hole penetrating through the outer side wall thereof.

[0009] The shell is provided with a guide hole.

[0010] Compared with the prior art, the test shaft has the advantages that:

[0011] The test shaft has the advantages that: the structure is compact, the design is reasonable, and the test shaft is easy to operate and maintain. The shell and the PTFE skin bowl inside the shell are driven to rotate by the driving mechanism, and the test shaft remains stationary, so that the sealing performance of the PTFE skin bowl in the rotating state is accurately tested. The special working condition that the matched shaft is stationary and the PTFE skin bowl rotates can be accurately simulated, which is very important for evaluating the sealing performance of the PTFE skin bowl in a specific rotating state. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is a structural schematic view of the test shaft;

[0013] Figure 2 is a sectional view of Figure 1 ;

[0014] Figure 3 is an enlarged view of A of Figure 2 ;

[0015] Figure 4 is a connection relationship schematic view of the shell, the test shaft and the protective tool;

[0016] Figure 5 is a structural schematic view of the test shaft;

[0017] Figure 6 is a front view of Figure 5 ;

[0018] Figure 7 is a structural schematic view of the protective tool;

[0019] Figure 8 is a front view of Figure 7 ;

[0020] Figure 9 is a structural diagram of the shell;

[0021] Figure 10 is Figure 9 a sectional view. DETAILED DESCRIPTION

[0022] The technical solutions in the utility model will be described clearly and completely in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] A kind of shaft static PTFE skin bowl rotation sealing performance testing device, including shell 1, test shaft 4, rubber skin bowl 5, drive mechanism 7 and cavity 8;The drive mechanism 7 is fixed on bottom plate, two frame bodies are fixed on the bottom plate, the cavity 8 is closely slidably attached between the two frame bodies, for limiting cavity 8 rotation;The output end of drive mechanism 7 is coaxially fixedly connected with the shell 1 of section U type, the inner wall of shell 1 is interference fit press-fitted with the PTFE skin bowl 9 to be verified, drive mechanism 7 drives shell 1 to rotate, for simulating the rotation of PTFE skin bowl 9 to be verified, shell 1 also plays the role of collecting test medium;The inner side of the PTFE skin bowl 9 is closely attached with test shaft 4, the rubber skin bowl 5 is interference fit press-fitted on test shaft 4, the inner side of the rubber skin bowl 5 is closely attached with the outer wall of shell 1, test shaft 4 is arranged in cavity 8 and the outer end of test shaft 4 is fixedly connected with cavity 8, test shaft 4 and cavity 8 are used to simulate the working condition that matched shaft is static;Rubber skin bowl 5 is used to seal test medium in cavity 8, to prevent test medium from leaking.

[0024] The test shaft 4 includes inner shaft 401, mounting ring 402 and connecting part 403, the mounting ring 402 is fixedly connected with the cavity 8 by means of internal hexagonal screw one 6, the inner shaft 401 is coaxially arranged in the inside of mounting ring 402, one end of the inner shaft 401 is fixedly connected with the mounting ring 402 by means of connecting part 403, the other end of the inner shaft 401 is coaxially inserted into the shell 1 and closely attached with the PTFE skin bowl 9 to be verified;The rubber skin bowl 5 is interference fit press-fitted on the inner wall of mounting ring 402.

[0025] The outer side of the rubber skin bowl 5 is provided with protective tooling 3, the protective tooling 3 is fixedly connected with the mounting ring 402 of test shaft 4 by means of internal hexagonal screw two 2. Protective tooling 3 is used to prevent rubber skin bowl 5 from falling off in the case of cavity 8 pressurization, and at the same time protective tooling 3 can block and collect leaked test medium.

[0026] The protective tool 3 is provided with a through hole 301 through the outer side wall for collecting leaked lubricating oil and facilitating observation of whether leakage occurs.

[0027] The shell 1 is provided with a guide hole 101 through the wall thickness for guiding the test medium so that the leaked test medium flows into the protective tool 3.

[0028] In use, the cavity 8 is pushed towards the driving mechanism 7 along the frame on the base plate, so that the PTFE cup 9 to be verified is in sealing contact with the inner shaft 401 of the test shaft 4, the lip of the PTFE cup 9 to be verified is tightly held on the inner shaft 401 of the test shaft 4, the PTFE cup 9 to be verified is driven to rotate by the driving mechanism 7, the test shaft 4 remains stationary due to being fixed with the cavity 8, and finally the working condition that the matched shaft is stationary and the PTFE cup rotates is simulated, thereby solving the problem that the conventional oil seal tester cannot simulate this special working condition.

[0029] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0030] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments that those skilled in the art can understand.

Claims

1. A shaft static PTFE cup seal rotation performance testing device, characterized in that: Including shell (1), test shaft (4), rubber skin bowl (5), drive mechanism (7) and cavity (8), the drive mechanism (7) is fixed on the bottom plate, the bottom plate is fixed with two frame bodies, the cavity (8) is between the two frame bodies, the output end of drive mechanism (7) is coaxially fixedly connected with the shell (1) with U-shaped cross section, the inner wall of shell (1) is interference fit press fitted with the PTFE skin bowl (9) to be verified, the inner side of PTFE skin bowl (9) is closely attached to test shaft (4), rubber skin bowl (5) is interference fit press fitted on test shaft (4), the inner side of rubber skin bowl (5) is closely attached to the outer wall of shell (1), test shaft (4) is arranged in cavity (8) and the outer end of test shaft (4) is fixedly connected with cavity (8).

2. The shaft static PTFE cup seal performance testing device according to claim 1, characterized in that: The test shaft (4) includes inner shaft (401), mounting ring (402) and connecting part (403), the mounting ring (402) is fixedly connected with the cavity (8), the inner shaft (401) is coaxially arranged in the mounting ring (402), one end of the inner shaft (401) is fixedly connected with the mounting ring (402) through the connecting part (403), the other end of the inner shaft (401) is coaxially inserted into the shell (1) and closely attached to the PTFE skin bowl (9) to be verified, the rubber skin bowl (5) is interference fit press fitted on the inner wall of the mounting ring (402).

3. The device of claim 2, wherein: The outer side of the rubber skin bowl (5) is provided with a protective tooling (3), and the protective tooling (3) is fixedly connected with the mounting ring (402) of the test shaft (4).

4. The shaft static PTFE cup seal performance testing device according to claim 3, characterized in that: The protective tooling (3) is provided with a through hole (301) penetrating through the outer side wall thereof.

5. The device for testing the rotary sealing performance of a shaft static PTFE cup according to claim 3 or 4, characterized in that: The shell (1) is provided with a guide hole (101). The shell (1) is provided with a guide hole (101).

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