Double-lip pump oil suction blocking and separating type anti-leakage structure

Abstract

This invention discloses a double-lip pump suction seal barrier-separation leak-proof structure, including a main lip, a secondary lip, and a rotating shaft, and a barrier ring pressed together by the main lip and secondary lip. A gap is provided between the barrier ring and the rotating shaft. When the rotating shaft rotates, the gap forms a high-pressure zone. The barrier ring, main lip, and rotating shaft together form an inner vortex zone, and the barrier ring, secondary lip, and rotating shaft together form an outer vortex zone. The sidewalls of the barrier ring in both the inner and outer vortex zones are provided with annular oil lines, and all annular oil lines on the same sidewall are concentrically arranged. This leak-proof structure utilizes centrifugal force and the high pressure of the variable-diameter section to form a vortex for liquid diversion; it achieves a balance between the pump suction pressure and the internal pressure of the cavity, thereby improving sealing performance. While retaining the advantages of the double-lip pump suction seal structure, it also prevents mud and water from entering, making it suitable for the harsh working conditions of heavy-duty off-road wheel assemblies.

Description

Technical Field

[0001] This invention relates to the field of sealing performance technology for double-lip pump suction seals, and in particular to a double-lip pump suction seal barrier separation type anti-leakage structure. Background Technology

[0002] The wheel assembly for special off-road vehicle chassis needs to meet the requirement of leak-free operation across complex terrain. PTFE oil seals with a spiral sealing surface create a pumping effect, effectively preventing oil leakage. Simultaneously, the airflow generated by the pumping action on the sealing surface reduces wear on the shaft diameter, extending service life. However, in rainy or muddy conditions, the oil seal easily draws mud and water into its inner cavity. When accumulated mud and water enter the main lip, wear creates gaps in the oil seal, leading to leakage. Therefore, it is necessary to design an oil seal structure that is suitable for the characteristics of oil seals and can adapt to muddy and wet environments to meet the leak-proof requirements of the wheel assembly under harsh conditions. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes a double-lip pump suction seal barrier separation anti-leakage structure. This anti-leakage structure utilizes centrifugal force and the high pressure of the variable diameter section to form a vortex for liquid diversion; it achieves a balance between the pump suction pressure and the internal pressure of the cavity, thereby improving the sealing performance. While retaining the advantages of the double-lip pump suction seal structure, it can also prevent mud and water from entering, making it suitable for the harsh working conditions of heavy-duty off-road wheel assemblies.

[0004] A double-lip pump suction seal barrier separation leak-proof structure includes a main lip, a secondary lip, and a rotating shaft, and also includes a barrier ring pressed by the main lip and the secondary lip. A gap is provided between the barrier ring and the rotating shaft. When the rotating shaft rotates, the gap forms a high-pressure zone. The barrier ring, the main lip, and the rotating shaft enclose an inner vortex zone, and the barrier ring, the secondary lip, and the rotating shaft enclose an outer vortex zone. The sidewalls of the barrier ring located in both the inner and outer vortex zones are provided with annular oil lines, and all the annular oil lines located on the same sidewall are concentrically arranged.

[0005] As a preferred embodiment of the above technical solution, the cross-sectional area of ​​the inner vortex region is larger than the cross-sectional area of ​​the outer vortex region.

[0006] As a preferred embodiment of the above technical solution, the annular oil lines on the inner and outer sides of the barrier ring are arranged in a one-to-one correspondence.

[0007] As a preferred embodiment of the above technical solution, the annular oil lines located on the same side of the barrier ring are arranged at equal intervals.

[0008] As a preferred embodiment of the above technical solution, the barrier ring is made of PTFE synthetic material.

[0009] As a preferred embodiment of the above technical solution, the gap between the barrier ring and the rotating shaft is 0.1-0.2 mm.

[0010] As a preferred embodiment of the above technical solution, the thickness of the barrier ring is 0.5-1mm.

[0011] As a preferred embodiment of the above technical solution, the depth of the annular oil line is 10-20% of the thickness of the barrier ring.

[0012] The beneficial effects of this invention are as follows:

[0013] Employing a barrier ring anti-leakage structure, it utilizes centrifugal force and the high pressure of the variable diameter section to create a vortex for liquid diversion; this balances the pump suction pressure with the internal pressure of the cavity, thereby improving sealing performance; simultaneously, it prevents contamination caused by oil and water mixing, ensuring that residual oil inside flows back through the pump, reducing the risk of leakage. After bench testing with mud and water, it has been verified to significantly improve sealing reliability and reduce oil seal wear; retaining the advantages of the double-lip pump suction oil seal structure, it also prevents mud and water from entering, making it suitable for the harsh working conditions of heavy-duty off-road wheel assemblies. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0016] Figure 3 This is a flow diagram of the internal vortex during the operation of the present invention.

[0017] The attached diagram is labeled as follows: 1-Main lip, 2-Secondary lip, 3-Rotating shaft, 4-Barrier ring, 5-Gap, 6-Inner vortex zone, 7-Outer vortex zone, 8-Annular oil line. Detailed Implementation

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] like Figure 1 , Figure 2The diagram illustrates a double-lip pump suction seal barrier-separation leak-proof structure, comprising a main lip 1, a secondary lip 2, and a rotating shaft 3. It also includes a barrier ring 4 pressed together by the main lip 1 and the secondary lip 2. A gap 5 is provided between the barrier ring 4 and the rotating shaft 3. When the rotating shaft 5 rotates, the gap 5 forms a high-pressure zone. An inner vortex zone 6 is formed by the barrier ring 4, the main lip 1, and the rotating shaft 3. An outer vortex zone 7 is formed by the barrier ring 4, the secondary lip 2, and the rotating shaft 3. Annular oil lines 8 are provided on the sidewalls of both the inner and outer vortex zones of the barrier ring 4, and all annular oil lines 8 on the same sidewall are concentrically arranged.

[0020] Specifically, the main lip 1 refers to the long lip used to seal the internal oil, and the secondary lip 2 refers to the short lip used to prevent the intrusion of external substances.

[0021] In this embodiment, the cross-sectional area of ​​the inner vortex region 6 is larger than the cross-sectional area of ​​the outer vortex region 7.

[0022] In this embodiment, the annular oil lines 8 on the inner and outer sides of the barrier ring 4 are arranged in a one-to-one correspondence.

[0023] In this embodiment, the annular oil lines 8 located on the same side of the barrier ring 4 are arranged at equal intervals.

[0024] In this embodiment, the barrier ring 4 is made of PTFE synthetic material.

[0025] In this embodiment, the gap between the barrier ring 4 and the rotating shaft 3 is 0.1-0.2 mm.

[0026] In this embodiment, the thickness of the barrier ring 4 is 0.5-1mm.

[0027] In this embodiment, the depth of the annular oil line 8 is 10-20% of the thickness of the barrier ring 4.

[0028] The working principle of this embodiment is as follows.

[0029] First, add a barrier ring 4 pressure plate to the middle of the double-lip pump suction seal, according to... Figure 1The components are assembled and installed in a combined manner; the barrier ring 4 is made of PTFE synthetic material, and the two ends are machined with equidistant concentric annular oil lines 8. The depth of the annular oil lines 8 is 10-20% of the thickness of the barrier ring 4; the barrier ring 4 and the rotating shaft 3 are left with a gap of 0.1-0.2mm, and the thickness of the barrier ring 4 is controlled at 0.5-1mm. During high-speed operation, the rotating shaft 3 forms a high-pressure zone on the surface of the barrier ring 4, separating the inner vortex zone 6 and the outer vortex zone 7. The pump suction oil-blocking zone creates inward pressure, and the oil-blocking chamber creates negative pressure. When the airflow passes through the high-pressure zone of the barrier ring 4, it is obstructed, forming an inner vortex under centrifugal force. Simultaneously, the high-pressure zone utilizes the gap with the rotating shaft 3 to balance the pressure difference between the inner vortex zone 6 and the outer vortex zone 7. Similarly, an outer vortex is formed under the pressure difference. The pressure difference draws a small amount of external water vapor and mud into the secondary lip. Due to the barrier ring 4's structure, it has a blocking and separating function, preventing mud from entering the interior. Under the action of the inner vortex of the oil seal, the internally deposited liquid is drawn back into the inner cavity, preventing leakage. Figure 3 As shown. The annular oil line 8 improves the self-adaptability of the barrier ring, and under pressure, it deflects to reduce the gap with the rotating shaft 3, thereby reducing leakage.

[0030] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-lip pump suction seal barrier-separation leak-proof structure, comprising a main lip, a secondary lip, and a rotating shaft, characterized in that: The device includes a barrier ring pressed by the main lip and the secondary lip. A gap is provided between the barrier ring and the rotating shaft. When the rotating shaft rotates, the gap forms a high-pressure zone. The barrier ring, the main lip, and the rotating shaft enclose an inner vortex zone, and the barrier ring, the secondary lip, and the rotating shaft enclose an outer vortex zone. The sidewalls of the barrier ring located in both the inner and outer vortex zones are provided with annular oil lines, and all the annular oil lines located on the same sidewall are concentrically arranged.

2. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 1, characterized in that: The cross-sectional area of ​​the inner vortex region is greater than that of the outer vortex region.

3. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 1, characterized in that: The annular oil lines on the inner and outer sides of the barrier ring are set in a one-to-one correspondence.

4. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 3, characterized in that: The annular oil lines located on the same side of the barrier ring are arranged at equal intervals.

5. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 1, characterized in that: The barrier ring is made of PTFE synthetic material.

6. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 1, characterized in that: The gap between the barrier ring and the rotating shaft is 0.1-0.2 mm.

7. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 1, characterized in that: The thickness of the barrier ring is 0.5-1mm.

8. The double-lip pump oil suction seal barrier separation anti-leakage structure according to claim 7, characterized in that: The depth of the annular oil line is 10-20% of the thickness of the barrier ring.

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