JPS5810049Y2 - Mechanical seal damper device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a damper device for a mechanical seal, and more particularly to a damper device that prevents vibration of a seal sliding portion.

Mechanical seals generate axial or rotational vibration in the seal nose due to the rotational runout of 'FN5 and the interface friction phenomenon in the seal sliding part, but this vibration sometimes causes a large displacement in the driven ring, causing the seal to slide. Excessive oil leakage may occur on the surface, significantly deteriorating the sealing function.

In order to prevent this vibration, a damper a as shown in FIG. 1 has conventionally been interposed between the case and the retainer. Although an elastic piece is formed, the production process is complicated due to its structure, and the assembly process is laborious and costly, resulting in high costs.

This invention was made to eliminate the above-mentioned drawbacks.
Vibrations of the seal nose are effectively buffered and damped by the elastic force of an elastic ring attached to the outer peripheral surface of the retainer, which is placed adjacent to the seal ring that has a seal nose that slides into contact with the end face of the mating ring. To provide a damper device that can always achieve a good sealing effect and can be easily applied to any type of mechanical seal.

Next, the present invention will be explained based on the illustrated embodiment.
Reference numeral 1 denotes a case that pivotally supports the rotating shaft 2, and inside the case 1 there are a seal ring 3 attached to the rotating shaft 2, and the seal ring 3.
A retainer 4 is provided closely disposed on the outer peripheral surface, and a bellows 5 is provided between the continuous end surface of the seal ring 3 and the retainer 4 and the bottom wall surface of the case 1, and the bellows 5 seals the shaft. A seal nose portion 7 is provided to protrude from the seal ring 3 and slides into contact with the end surface of the titing ring 6 fixed to the rotating shaft 2.

Retainer 4 of such a bellows type mechanical seal
A concave groove 8 is formed on the outer peripheral surface, and an elastic ring 9 is provided around the circumferential surface.

The elastic ring 9 is made of an elastic material such as rubber, synthetic resin, or a coil spring, and is pushed into the retainer 4 by a protrusion 10 provided by bending the end of the case 1 toward the axis. A recess 11 is formed on the outer circumferential surface of the retainer 4, which is stretched so that the retainer 4
is formed.

When the rotating shaft 2 is driven, the seal nose 7 that comes into sliding contact with the end surface of the titting ring 6 vibrates in the rotational direction or the axial direction due to the phenomenon of interfacial friction. The elastic ring 9, which is stretched and disposed around the circumference so as to have an appropriate elastic force, always applies its elastic force to the outer circumferential surface of the seal ring 3 having the seal nose portion 7 through the retainer 4 evenly toward the axis. By applying force, the vibrations of the seal nose portion 7 are damped and absorbed.

Another embodiment of the present invention will be explained with reference to FIG.
The mechanical seal of this example is different from that of the previous example.

In other words, a retainer 4a that is disposed around the rotating shaft 2 has a seal ring 3 having a seal nose 7 at one end thereof, which is fitted into the stepped part 12 and arranged adjacent to the retainer 4a. A spring 13 is interposed between the corresponding end faces of the retainer 4a and the case 1 to elastically press the end face of the seal nose portion 7 against the end face of the mating ring 6.

An elastic ring 9 is fitted into a groove 8 formed on the outer peripheral surface of the retainer 4a.
a A pin 14 that is pulled inward and is installed on the inner wall of the case 1, and a retainer 4 that corresponds to the pin 14.
An arcuate recess 11a is formed on the outer circumference of the outer circumferential surface, and the pin 14 and the recess 11a cause the seal nose 7 to vibrate due to the elastic force of the elastic ring 9 covered by the retainer 4a. It buffers and suppresses the

As explained above, the present invention provides an elastic ring made of an appropriate material around the outer circumferential surface of a retainer that is arranged adjacent to a seal ring, and a recess formed in the outer circumferential surface of the retainer and a protrusion formed on the case side. Since the mechanical seal is held in such a way as to apply an appropriate tensile force, the vibrations generated on the seal sliding surface can be buffered and absorbed by the appropriate elastic action of the elastic ring, and the sealing function of the mechanical seal can always be maintained in good condition. .

Moreover, the present invention has a relatively simple structure in which an elastic ring is attached to the outer circumferential surface of the retainer, so it is easy to assemble and process, and can be provided at a low price.It can also be easily applied to various types of mechanical seals. The practical effects are extremely large, such as the ability to easily adjust the damper effect by selecting the material of the elastic ring or increasing or decreasing the number of recesses and protrusions formed on the retainer and case. Hey.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view of a main part showing a conventional mechanical seal damper device, and FIG.
The figure is a cross-sectional view of the main part of the present invention, Fig. 3 is a side view taken in the direction of the arrow in Fig. 2, and Fig. 4 is a cross-sectional view of the main part showing another embodiment of the present invention.
The figure is a side view in the direction of the arrow in FIG. 4. 1... Case, 2... Rotating shaft, 3...
... Seal ring, 4, 4a ... Retainer, 5 ... Bellows, 6 ... Mating ring, 7 ... Seal nose part, 8・・・・・・
... Concave groove, 9 ... Elastic ring, 10 ...
...Protrusion, 11, 11a...Concavity, 12...
...Stepped portion, 13...Spring, 14...
····pin.

Claims (1)

[Scope of utility model registration request] A concave groove is formed on the outer circumferential surface of the retainer, which is disposed adjacent to the seal ring having a seal nose portion that makes sliding contact with the end surface of the mating ring of the rotating shaft, and an elastic ring is provided around the retainer, and the elastic ring is pulled so as to be pushed inside the retainer. A damper device for a mechanical seal, characterized in that a protrusion is provided on the case side, and a recess is formed on the outer peripheral surface of the retainer at a position corresponding to the protrusion.