Anti-friction mechanical seal device

By designing an anti-dry-friction mechanical seal device, which uses a motor to drive the stationary ring to move and adjust the distance of the rotating ring, the problem of increased friction surface temperature and wear caused by dry friction after the water pump runs out of medium is solved, thus achieving safe sealing and equipment protection.

CN224515946UActive Publication Date: 2026-07-17SHIJIAZHUANG ZHISHENG MASCH SEALING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHIJIAZHUANG ZHISHENG MASCH SEALING CO LTD
Filing Date
2025-08-06
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In the prior art, when a water pump runs dry after the medium is exhausted, the temperature of the friction surface between the rotating ring and the stationary ring rises sharply due to dry friction, which intensifies wear and may even cause serious damage such as surface ablation and adhesion.

Method used

A dry-wear-resistant mechanical seal device was designed. Through the cooperation of a rotating ring, a stationary ring, a contact ring, and a temperature sensor, the stationary ring is driven by a motor to move, adjusting the distance between it and the rotating ring to avoid direct contact. The device uses a medium for lubrication. The motor senses the temperature rise, sends a signal, and controls the motor to start moving the stationary ring. This causes the contact plate to create a distance between it and the rotating ring, thus avoiding direct contact and achieving the purpose of preventing dry wear.

Benefits of technology

It effectively prevents the friction surface temperature from rising and wear caused by dry grinding, avoids equipment damage, and achieves a safe seal when the medium is scarce.

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    Figure CN224515946U_ABST
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Abstract

The utility model relates to mechanical seal technical field, propose a kind of anti dry grinding mechanical seal device, including pump shaft and sealing gland, pump shaft rotation is arranged in sealing gland, protruding portion is provided in sealing gland, still include rotating ring, stationary ring and abutment ring, rotating ring is fixed on pump shaft by fixed part, stationary ring is movably arranged in sealing gland by moving mechanism, annular slide groove is opened in stationary ring, abutment ring is slidably matched with the inner wall of annular slide groove by elastic connecting piece, for cooperating moving mechanism and stationary ring adjustment and rotating ring distance, temperature sensor is installed in one end of abutment ring, temperature sensor and motor electrically connected, moving seat is arranged in one end of stationary ring, the width of stationary ring is greater than the length of moving groove. By the above technical scheme, for solving the dry grinding of water pump in the prior art when idling after medium (water) depletion, the problem of the friction surface temperature of rotating ring and stationary ring sharply rising, wear aggravation.
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Claims

1. A mechanical seal device for preventing dry friction, comprising a pump shaft (1) and a sealing gland (2), wherein the pump shaft (1) is rotatably disposed within the sealing gland (2), characterized in that, The sealing cap (2) has a protrusion (3) inside, and also includes: A rotating ring (4) is fixed to the pump shaft (1) by a fixing member; A stationary ring (5) is movably disposed within the sealing cover (2) via a moving mechanism, and an annular groove (6) is provided within the stationary ring (5); The abutment ring (7) slides with the inner wall of the annular groove (6) through an elastic connector, and is used to cooperate with the moving mechanism and the stationary ring (5) to adjust the distance with the rotating ring (4).

2. A dry gas seal apparatus as claimed in claim 1, wherein The fastener includes: A retaining ring (8) is fitted onto the pump shaft (1) by a plurality of locking bolts (9) and is detachably coaxially connected to the pump shaft (1); The limiting plate (10) is provided with a plurality of limiting plates (10) circumferentially arranged at one end of the fixing ring (8). One end of the limiting plate (10) is arc-shaped and cooperates with the rotating ring (4). The plurality of limiting plates (10) are fixedly connected to the rotating ring (4). A sealing ring (11) is provided between the fixing ring (8) and the rotating ring (4).

3. A dry gas seal apparatus as claimed in claim 2, wherein, The mobile mechanism includes: The threaded rod (12) has a movable groove (13) on the inner wall of the sealing cover (2), and the threaded rod (12) is rotatably disposed in the movable groove (13). The movable seat (14) is slidably disposed in the movable groove (13), the movable seat (14) is threadedly engaged with the threaded rod (12), and one end of the movable seat (14) is fixedly connected to the stationary ring (5). The motor (15) is mounted on the sealing cover (2), and the output end of the motor (15) is coaxially and fixedly connected to one end of the threaded rod (12).

4. A dry gas seal apparatus as claimed in claim 3, wherein The elastic connector includes: Telescopic rods (16), a plurality of telescopic rods (16) are arranged circumferentially on the inner wall of the groove, and one end of each of the telescopic rods (16) is fixedly connected to one end of the abutment ring (7); A spring (17) is sleeved on the outside of the telescopic rod (16), and the two ends of the spring (17) are fixedly connected to the inner wall of the groove and one end of the abutment ring (7), respectively.

5. A dry gas seal apparatus as claimed in claim 3, wherein A temperature sensor (18) is installed at one end of the abutment ring (7), and the temperature sensor (18) is electrically connected to the motor (15).

6. A dry gas seal apparatus as claimed in claim 3, wherein The movable seat (14) is disposed at one end of the stationary ring (5), and the width of the stationary ring (5) is greater than the length of the movable groove (13).