JPS6318863Y2 - - Google Patents

Description

[Detailed explanation of the idea] This proposal relates to mechanical seals.

Generally, a mechanical seal consists of an immovable part consisting of a fixed ring or seal rings B, B, etc., and a seal ring C that rotates with the rotating shaft J while floating relative to the rotating shaft J or a sleeve, etc., as shown in Figure 1. It consists of a rotating ring D and the like, and a rotating part that is fixed to a rotating shaft J and includes a spring E, a mounting ring F, a set screw G, a drive pin H, and the like. Therefore, when this mechanical seal is used to seal a liquid in which crystals are likely to precipitate or particles contained in the liquid are likely to solidify, the rotating ring D of the mechanical seal, which is movable in the above-mentioned floating state, and Solid matter K accumulates in the gap between the rotating shaft J and the floating effect of the rotating ring D is often inhibited. The effect of this rotating ring D is between the mounting ring F and the fixed ring A, and it absorbs vibrations of the rotating shaft J, and even if the sliding surface with the fixed ring A wears out, the force of the spring E will absorb the vibrations of the rotating shaft J. The rotating ring D is always in close contact with the stationary ring A to prevent liquid from entering, and for this reason the rotating ring D rotates in a so-called floating state, and as mentioned above, the rotating ring D rotates in a floating state. If solid matter gets between J and rotating ring D, the floating state will be prevented, vibrations of rotating shaft J will not be able to be absorbed, and contact with stationary ring A will also be inhibited.

This proposal was developed in view of the above matters, and the seal ring is held in the sleeve so that the seal ring can be positioned at the tip of the inner circumferential surface of the rotating ring.
The object of the present invention is to provide a mechanical seal having a structure that prevents liquid from entering the gap between the sleeve and the inner circumferential surface of the rotating ring.

Next, an embodiment of the present invention will be described based on the drawings.

A sleeve 2 is tightly fitted onto the rotating shaft 1, a fixed ring 3 is provided, a rotating ring 4 that rotates in contact with one end surface of the fixed ring 3 is installed, and the inner peripheral surface of the rotating ring 4 and the rotating ring 4 are installed. A groove 6 in which the seal ring 5 is installed in the sleeve 2 corresponding to the inner circumferential surface of the rotating ring 4 on the fixed ring 3 side with a certain gap provided between the sleeve 2 fitted on the shaft 1 and the sleeve 2 fitted on the shaft 1.
A seal ring 5 is fitted into the groove 6.

Note that the groove 5 of the sleeve 2 may be provided in one sleeve, or as shown in FIG.
One sleeve 7 may have a stepped portion 8 on the outer peripheral surface of the end surface, and a groove 5 may be formed between it and the end surface of the other sleeve 9. With this configuration, fitting the seal ring 5 becomes extremely easy. Further, 10 represents a spring, 11 a mounting ring, 12 a set screw, and 13 a drive pin.

Since this proposal has the above-mentioned configuration, unlike conventional mechanical seals, there may be a slight increase in the number of parts, but the processing is simple, and the seal ring is positioned at the end of the inner circumferential surface of the rotating ring. Since the rotary ring can be positioned in the inner peripheral surface of the rotary ring, no foreign matter can enter the gap between the inner circumferential surface of the rotary ring and the sleeve, and the effect of the rotary ring can be fully exhibited, which is extremely effective in practical use.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional mechanical seal, and FIG. 2 is a sectional view showing an embodiment of the present invention. 1... Rotating shaft, 2... Sleeve, 3... Fixed ring, 4... Rotating ring, 5... Seal ring, 6...
groove.

Claims (1)

[Scope of utility model registration request] In a mechanical seal including a fixed ring and a rotating ring, a seal ring 5 is fitted into a sleeve 2 provided with a groove 6, this sleeve is closely fitted to the rotating shaft 1, and the seal ring 5 is inserted into the rotating ring 4. A mechanical seal characterized in that it is located at an end on the fixed ring 3 side of the inner circumferential surface of the mechanical seal.