一种超高压柱塞泵用水膜密封润滑结构

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By employing a water film sealing lubrication structure in the ultra-high pressure plunger pump, lubrication is achieved through an annular lubrication gap under ultra-high pressure conditions, thus solving the problem of easy damage to the sealing components and achieving stronger sealing performance and longer service life.

CN224515377UActive Publication Date: 2026-07-17ZHEJIANG SHANGSHI PUMP TECHNOLOGY CO LTD

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: ZHEJIANG SHANGSHI PUMP TECHNOLOGY CO LTD
Filing Date: 2025-08-28
Publication Date: 2026-07-17

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Abstract

本实用新型提供了一种超高压柱塞泵用水膜密封润滑结构，包括密封衬套、间隙配合设置在密封衬套内侧的柱塞轴，密封衬套与柱塞轴之间形成有环形润滑间隙，超高压环境下，介质将穿过环形润滑间隙，对密封衬套与柱塞轴的相对移动进行润滑。在未达到超高压环境时，介质在表面张力影响下无法穿过宽度较小的环形润滑间隙，如此密封衬套与柱塞轴相互配合可用以对介质进行密封。在超高压环境下，介质将穿过环形润滑间隙，用以在密封衬套与柱塞轴发生相对移动时起到润滑的作用。密封衬套相较于密封圈具有更高的强度以及更高的耐磨性能，不易在使用过程中磨损，不易影响超高压柱塞泵的使用寿命。

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Claims

1. A water film seal lubrication structure for an ultrahigh pressure plunger pump, characterized by: It includes a sealing bushing (9) and a plunger shaft (10) arranged with a clearance fit inside the sealing bushing (9). An annular lubricating gap (11) is formed between the sealing bushing (9) and the plunger shaft (10). Under an ultra-high pressure environment, the medium will pass through the annular lubricating gap (11) to lubricate the relative movement between the sealing bushing (9) and the plunger shaft (10).

2. The water film sealing and lubricating structure for an ultra-high pressure plunger pump according to claim 1, characterized in that: The width of the annular lubricating gap (11) is 0.5um - 6.0um.

3. The water film sealing and lubricating structure for an ultra-high pressure plunger pump according to claim 2, characterized in that: The width of the annular lubricating gap (11) is 0.5um - 1.0um.

4. The water film sealing and lubricating structure for an ultra-high pressure plunger pump according to claim 1, characterized in that: Both the sealing bushing (9) and the plunger shaft (10) are made of tungsten steel.

5. The water film sealing lubrication structure for an ultra-high pressure plunger pump according to claim 1, characterized in that: The length of the sealing bushing (9) is a, and the length of the plunger shaft (10) is b, where 0.2a < b < 0.4a. When the medium flows through the annular lubricating gap (11), the pressure of the medium gradually decreases.

6. The water film sealing and lubricating structure for an ultra-high pressure plunger pump according to claim 1, characterized in that: An outward-turning shoulder (14) is provided at the lower end of the sealing bushing (9). An inverted T-shaped installation chamber (15) is formed in the plunger pump body (2), and the sealing bushing (9) is arranged in the installation chamber (15).

7. The water film sealing and lubricating structure for an ultra-high pressure plunger pump according to claim 6, characterized in that: A rubber sealing structure (16) is provided between the outward-turning shoulder (14) and the inner cavity wall of the installation chamber (15). An annular extrusion gap (17) is formed between the sealing bushing (9) and the inner cavity wall of the installation chamber (15).