Lip-shaped oil seal static pressure resistance test device

Abstract

The utility model relates to a static pressure resistance test device for a lip-shaped oil seal. At present, the static pressure resistance test of the lip-shaped oil seal for the hydraulic pump is directly carried out on a delivery pump, the test period is long, the cost is high, the conclusion feedback is slow, and the optimization and improvement of the structure in a short time are not facilitated. The die comprises an upper die and a lower die, a medium cavity is formed in the upper die and the lower die after the upper die and the lower die are matched, and the medium cavity is connected with an external pressure medium source through the lower die; a lip-shaped oil seal is installed on the lower die, the lower end of the upper die is inserted into an inner diameter hole of the lip-shaped oil seal, and the upper die and the lower die are fixed through a fixing piece. The sealing shaft of the upper die and the pressure medium source connected with the lower die are used for simulating actual pressure conditions, the compression resistance and existing problems of the lip-shaped oil seal can be obtained in a short time, effective structural optimization and improvement are facilitated, the test period and the sealing element development period are shortened, resources and cost are saved, and the production efficiency is improved. Conclusion feedback is timely and reliability is high.

Description

Technical Field

[0001] This utility model relates to the field of sealing component testing technology, specifically to a lip seal static pressure resistance testing device. Background Technology

[0002] In pumps transporting various liquid media, pressure-resistant lip seals are typically used for dynamic media sealing at the power input end. If the seal fails, media leakage will not only reduce the transport pressure but also cause short circuits, motor damage, or shutdowns due to media flowing into the drive motor. Therefore, the sealing performance of the lip seal under high pressure is a crucial factor affecting the pump's function, service life, and reliability.

[0003] The sealing performance of lip seals under high pressure is highly dependent on their structural parameters. In addition to theoretical calculations, finished product testing is necessary to verify the correctness of the structural design, whether it meets technical requirements and target values. Currently, finished product testing is conducted directly on the delivery pump, which is time-consuming, costly, and results in slow feedback, often hindering the optimization and improvement of the structure in the short term.

[0004] Therefore, there is an urgent need for a hydrostatic pressure testing device for lip seals that has a short testing cycle, low cost, and timely feedback of results. Summary of the Invention

[0005] The purpose of this invention is to provide a hydrostatic pressure resistance test device for lip seals, so as to at least solve the problems of long cycle, high cost and slow feedback of current hydrostatic pressure resistance tests for lip seals.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A lip seal static pressure resistance testing device includes an upper mold and a lower mold. After the upper mold and the lower mold are fitted together, a medium cavity is formed inside. The medium cavity is connected to an external pressure medium source through the lower mold.

[0008] A lip seal is installed on the lower mold, and the lower end of the upper mold is inserted into the inner diameter hole of the lip seal. The upper mold and the lower mold are fixed by a fastener.

[0009] Furthermore, the upper mold is inverted convex shape, and the lower end of the inverted convex shape is a sealing shaft.

[0010] Furthermore, the lower mold is concave and is adapted to the upper mold.

[0011] Furthermore, the lower mold is provided with an oil seal mounting hole, which communicates with the medium cavity.

[0012] Furthermore, the lip seal is disposed in the oil seal mounting hole, and the opening of the lip seal faces the upper mold.

[0013] Furthermore, an installation groove is provided at the contact point between the upper end face of the lower mold and the upper mold, and a sealing ring is provided in the installation groove.

[0014] Furthermore, a medium input pipe is provided on one side of the lower mold, the medium input pipe extends from the outer side wall of the lower mold to the inner side wall, and communicates with the medium cavity.

[0015] Furthermore, the upper mold has several threaded through holes, and the lower mold has several threaded holes corresponding to the threaded through holes.

[0016] Furthermore, the fastener is a screw, which is screwed into the threaded through hole and the threaded hole from top to bottom.

[0017] Furthermore, both the outer edges of the upper mold and the outer edges of the lower mold are chamfered.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention provides a hydrostatic pressure testing device for lip seals, suitable for pressure testing of lip seals. It can verify the structure and pressure-bearing performance of lip seals. It is equipped with an upper mold and a lower mold. The pressure medium source connected to the upper mold and the lower mold simulates the actual pressure conditions. It can quickly determine the pressure resistance performance and existing problems of lip seals, which is conducive to carrying out effective structural optimization and improvement. It is simple and easy to implement, thereby shortening the test cycle and the development cycle of seals, saving resources and costs, and providing timely feedback and high reliability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a longitudinal sectional view of the present invention;

[0022] Figure 2 This is a longitudinal section view of the upper mold;

[0023] Figure 3 This is a longitudinal section view of the lower mold;

[0024] Figure 4 This is a longitudinal cross-sectional view of a lip seal;

[0025] Figure 5 This is a longitudinal cross-sectional view of the sealing ring;

[0026] The diagram is labeled as follows:

[0027] 1-Upper mold, 2-Lower mold, 3-Lip seal, 4-Sealing shaft, 5-Media cavity, 6-Sealing ring, 7-Screw, 8-Media input pipe, 9-Threaded through hole, 10-Threaded hole. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Example:

[0032] like Figure 1 As shown, this embodiment provides a hydrostatic pressure resistance test device for lip seals, which is suitable for pressure resistance testing of lip seals 3. The device has a short test cycle, requires few resources, and is simple and easy to operate. The device includes an upper mold 1 and a lower mold 2. After the upper mold 1 and the lower mold 2 are fitted together, a medium cavity 5 is formed inside. The lower mold 2 is connected to an external pressure medium source. The lip seal 3 is installed on the lower mold 2, and the lower end of the upper mold 1 is inserted into the inner diameter hole of the lip seal 3. The upper mold 1 and the lower mold 2 are fixed by a fixing component.

[0033] Specifically, such as Figure 2As shown, the upper mold 1 is inverted convex shape, and its lower end is the sealing shaft 4. The size and surface quality of the sealing shaft 4 are consistent with the actual mating shaft of the lip seal 3. After the upper mold 1 and the lower mold 2 are fitted together, the sealing shaft 4 is inserted into the inner diameter hole of the lip seal 3, simulating the actual mating shaft of the lip seal 3.

[0034] Preferably, the diameter of the sealing shaft 4 is 12mm.

[0035] like Figure 3 As shown, the lower mold 2 is concave and matches the inverted convex shape of the upper mold 1. The upper longitudinal section of the cavity inside the concave lower mold 2 is an inverted trapezoid, and the middle longitudinal section of the cavity is a rectangle. The lower part of the cavity is used to install the lip seal 3. The length of the bottom surface of the inverted trapezoid is the same as the length of the rectangle. Furthermore, the cavity of the inverted trapezoidal part of the lower mold 2 fits into the upper mold 1, so that the middle cavity forms the medium cavity 5.

[0036] In this embodiment, an oil seal mounting hole is provided in the lower part of the cavity of the lower mold 2. The size and surface quality of the oil seal mounting hole are consistent with the actual oil seal mounting hole. The oil seal mounting hole is used to install the lip seal 3 and is connected to the medium cavity 5.

[0037] Preferably, the diameter of the oil seal mounting hole is 22mm.

[0038] like Figure 4 As shown, after the lip seal 3 is installed in the oil seal mounting hole, the opening of the lip seal 3 faces the upper mold 1. Preferably, the inner diameter of the lip seal 3 is 12mm, the outer diameter is 22mm, and the height is 7mm.

[0039] A mounting groove is provided at the contact point between the upper end face of the lower mold 2 and the upper mold 1. The mounting groove is generally circular. In this embodiment, the longitudinal section of the mounting groove is rectangular. A sealing ring 6 is placed in the mounting groove. Figure 5 As shown, the sealing ring 6 is circular, and the longitudinal section of the sealing ring 6 is circular. The diameter of the sealing ring 6 is greater than the depth of the mounting groove and less than the width of the mounting groove, so that after the upper mold 1 closes, the sealing ring 6 is squeezed to fill the mounting groove and ensure the sealing performance.

[0040] Preferably, the sealing ring 6 has an inner diameter of 90mm, a wire diameter of 3.55mm, a mounting groove width of 4.8mm, a depth of 2.9mm, and an inner diameter of 90mm.

[0041] Specifically, a medium input pipe 8 is provided on one side of the lower mold 2. The medium input pipe 8 extends from the outer side wall of the lower mold 2 to the inner side wall and is connected to the medium cavity 5. The medium input pipe 8 is connected to an external pressure medium source, thereby delivering the pressure medium to the medium cavity 5.

[0042] The pressure medium is selected from air, lubricating oil, fuel oil, and hydraulic oil, and is the same as the actual medium used. The pressure of the pressure medium is adjusted by the pressure medium source.

[0043] In this embodiment, the upper mold 1 has six threaded through holes 9. In other embodiments, the number of screw through holes 9 may also be five, and is not limited thereto. Preferably, the diameter of the threaded through holes 9 is 6mm.

[0044] The lower mold 2 has six threaded holes 10 corresponding to the threaded through holes 9. The threaded holes 10 are located above the medium input pipe 8 and outside the sealing ring 6. Preferably, the diameter of the threaded holes 10 is M5.

[0045] In this embodiment, the fixing component is screw 7. Screw 7 is screwed into threaded through hole 9 and threaded hole 10 from top to bottom to fix upper mold 1 and lower mold 2. Preferably, screw 7 is an M5 screw.

[0046] In this embodiment, the upper outer edge of the upper mold 1 and the bottom edge of the lower sealing shaft 4 are both chamfered, and the upper and lower outer edges of the lower mold 2 are both chamfered.

[0047] In this embodiment, both the upper mold 1 and the lower mold 2 are made of metal.

[0048] The experimental process in this embodiment is as follows:

[0049] Install the test piece lip seal 3 into the oil seal mounting hole of the lower mold 2, and place the sealing ring 6 into the mounting groove of the lower mold 2;

[0050] Assemble the upper mold 1 and the lower mold 2. Insert the sealing shaft 4 of the upper mold 1 into the inner diameter hole of the lip seal 3. Screw the screw 7 into the threaded through hole 9 and the threaded hole 10 to connect the upper mold 1 and the lower mold 2. Do not tighten the screw 7 yet, leaving a gap of 0.5mm.

[0051] Next, connect the medium input pipe 8 of the lower mold 2 to the pressure medium source, remove the air from the medium cavity 5, and then tighten the screw 7.

[0052] Adjust the medium pressure in stages from low to high (0 to 0.8 MPa), and maintain the pressure for 10 minutes in each stage. By adjusting the medium pressure and maintaining the pressure for a certain period of time, observe whether there is medium leakage or oil seal rubber extrusion at the sealing shaft 4 to test the pressure bearing capacity of the lip seal 3.

[0053] Record the test conditions and test data. After the test is completed, depressurize and disassemble the lip seal 3, check its appearance and dimensions, and issue a test report.

[0054] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A hydrostatic pressure resistance testing device for lip-shaped oil seals, characterized in that: It includes an upper mold (1) and a lower mold (2). After the upper mold (1) and the lower mold (2) are fitted together, a medium cavity (5) is formed inside. The medium cavity (5) is connected to an external pressure medium source through the lower mold (2). The lip seal (3) is installed on the lower mold (2), and the lower end of the upper mold (1) is inserted into the inner diameter hole of the lip seal (3). The upper mold (1) and the lower mold (2) are fixed by a fastener.

2. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: The upper mold (1) is inverted convex shape, and the lower end of the inverted convex shape is a sealing shaft (4).

3. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: The lower mold (2) is concave and is adapted to the upper mold (1).

4. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: The lower mold (2) has an oil seal mounting hole, which is connected to the medium cavity (5).

5. The hydrostatic pressure resistance test device for a lip seal according to claim 4, characterized in that: The lip seal (3) is disposed in the oil seal mounting hole, and the opening of the lip seal (3) faces the upper mold (1).

6. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: An installation groove is provided at the joint between the upper end face of the lower mold (2) and the upper mold (1), and a sealing ring (6) is provided in the installation groove.

7. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: A medium input pipe (8) is provided on one side of the lower mold (2). The medium input pipe (8) extends from the outer side wall of the lower mold (2) to the inner side wall and communicates with the medium cavity (5).

8. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: The upper mold (1) has several threaded through holes (9), and the lower mold (2) has several threaded holes (10) corresponding to the threaded through holes (9).

9. The hydrostatic pressure resistance test device for a lip seal according to claim 8, characterized in that: The fastener is a screw (7), which is screwed into the threaded through hole (9) and the threaded hole (10) from top to bottom.

10. The hydrostatic pressure resistance test device for a lip seal according to claim 1, characterized in that: The outer edges of the upper mold (1) and the outer edges of the lower mold (2) are both chamfered.

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