JPS6229727Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a mechanical seal, and its purpose is to prevent slurry from clogging between the shaft packing and the shaft, causing leakage due to the slurry.
Slurry can be removed so that the moving ring does not move smoothly in the axial direction and the sealing effect is not degraded, and the slurry that adheres to the spring section provided between the moving ring and the rotating ring can be effectively removed. The aim is to provide a mechanical seal that can be removed.

Hereinafter, as an example, the configuration will be described in the case where the present invention is applied to a pump. 1 is a pump casing, 2 is a shaft, 3 is an impeller attached to the shaft end, and 4 is a fixed ring fixed to the inner circumference of the casing, which is attached to the lid of the casing 1 via a buffer ring 5.
Reference numeral 6 denotes a rotating ring that rotates together with the shaft 2, and is fixed on the shaft 2 by a key 7. Reference numeral 8 denotes a movable ring, which is slidably fitted onto the shaft 2 via a shaft packing 9 between the fixed ring 4 and the rotating ring 6, and has an engaging piece 10 that engages with the rotating ring 6. A through hole 11 was formed in this engagement piece 10 portion. Furthermore, the movable ring 8 is urged by a spring 12 provided between the movable ring 8 and the rotating ring so that it is always in contact with the fixed ring. As the shaft packing 9, an O-ring, a U-ring, a V-ring, etc. are usually used. 13 is an engagement piece of the rotating ring 6, and 14 is a through hole. Reference numeral 15 indicates a sliding contact surface between the movable ring 8 and the shaft, and 16 indicates a contact surface between the movable ring 8 and the fixed ring 4. The movable ring 8 is fitted onto the shaft via the shaft packing 9, and the engagement piece 10 and 13, it rotates together with the rotating ring 6, and is constantly pressed in the direction of the fixed ring 4 by a spring 12, making close contact with it and sliding on the contact surface 16, so that it is tightly sealed and completely sealed. . The feature of the present invention is that the moving ring 8
In this case, a through hole 11 is formed in the engagement piece 10 of the movable ring 8 and the rotating ring 6, and in the drawings shown in the embodiment, a through hole 14 is also formed in the engagement piece 13 of the rotating ring 6.
It is at the point where it was formed.

As described above, the present invention includes the engaging piece 10 of the moving ring 8.
Since the through hole 11 is formed in the spring 12, the slurry adhering to the spring 12 is removed from the movable ring 8 and the rotating ring 6.
The centrifugal force generated at the inner periphery of the tube made it possible to discharge the liquid to the outside. Therefore, the slurry does not get stuck between the shaft packing and the shaft, causing liquid leakage, and the movement of the moving ring in the axial direction is not obstructed.
This ensures a sealing effect at the contact surface 16 between the movable ring and the fixed ring. Furthermore, by forming the through hole 11, the center of gravity of the movable ring 8 can be set closer to the fixed ring 4, ensuring drive stability and smooth rotation, which promotes the sealing effect at the contact surface 16. There is a characteristic that Furthermore, the engagement piece 13 of the rotating ring 6
If a through hole 14 is formed in the movable ring 8 in the same manner as in the case of the movable ring 8, the effect of removing the slurry generated around the spring 12 will be further improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the main parts of a pump to which the present invention is applied, Fig. 2 is a plan view of the main parts showing the state of engagement between the rotating ring and the movable ring, and Fig. 3 is an exploded perspective view of the vicinity of the shaft. . 1... Casing, 2... Shaft, 4... Fixed ring,
6... Rotating ring, 8... Moving ring, 9... Shaft packing, 10... Engaging piece, 11... Through hole, 12...
Spring, 13... Engagement piece, 14... Through hole.

Claims (1)

[Claims for Utility Model Registration] (1) A fixed ring fixed to the casing, a rotating ring rotating together with the shaft, and a shaft packing inserted between the fixed ring and the rotating ring, which is rotatably fitted onto the shaft and engaged with the rotating ring. In a mechanical seal consisting of a movable ring, the movable ring has an engagement piece that engages the rotary ring and is always biased by a spring provided between the movable ring and the fixed ring, the movable ring engages with the rotary ring. A mechanical seal characterized by having a through hole formed in one part. (2) The mechanical seal according to claim 1, which uses an engaging piece portion having a through hole as the engaging piece portion of the rotating ring that engages with the engaging piece portion of the movable ring.