Floating ring mechanical seal

By forming a diamond film on the outer circumference and back of the rotating ring of the floating ring mechanical seal, and combining it with a thermal conductive ring, the problem of thermal strain caused by temperature differences is solved, ensuring the parallelism and stable sliding of the sealing surface, and expanding the application range of the seal.

Active Publication Date: 2017-11-28
NIPPON PILLAR PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If thermal strain occurs in the rotating ring 102, the parallelism between the sealing surface 102a of the rotating ring 102 and the sealing surface 105a of the floating ring 105 cannot be ensured, and as a result, the sealing function may deteriorate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0039] figure 1 It is a longitudinal sectional explanatory view of the mechanical seal M according to the first embodiment of the present invention, figure 2 yes figure 1 This is an enlarged explanatory view of the main part of the mechanical seal M shown. Among them, in Figure 2 ~ Figure 4 In , the film thickness of the diamond film is drawn exaggeratedly for easy understanding.

[0040] The mechanical seal M according to the present embodiment is preferably a BFP (boiler supply seal) that supplies water to a boiler of a thermal power plant, for example, where the pressure of the fluid to be sealed is relatively high and the pressure may fluctuate greatly depending on the operating conditions. Floating ring mechanical seals used in shaft seal units such as water pumps.

[0041] The mechanical seal M has: a seal box 2 mounted on the pump casing 1; a sleeve 4 fixed to the outer periphery of the rotating shaft 3 protruding from the pump casing 1 through the pump casing 1...

no. 2 Embodiment approach

[0054] image 3 It is an enlarged explanatory view of main parts of the mechanical seal according to the second embodiment of the present invention. The mechanical seals according to the second embodiment and the third embodiment described later, and the mechanical seal M according to the first embodiment differ only in the structure of the rotating ring, and other stationary rings, floating rings, etc. The structure is general. Therefore, the same reference numerals are assigned to common constituent elements, and their descriptions are omitted for brevity.

[0055]In the present embodiment, a diamond film d1 is formed on the sealing surface 5a of the rotating ring 5 that slides with respect to the floating ring 8, and a diamond film d1 is formed on the inner peripheral surface 5d and the back surface 5c of the rotating ring 5, respectively. Diamond film d4 continuous to diamond film d1 of surface 5 a and diamond film d3 continuous to diamond film d4 . Therefore, not only ...

no. 3 Embodiment approach

[0058] Figure 4 It is an enlarged explanatory view of main parts of the mechanical seal according to the third embodiment of the present invention. In the present embodiment, diamond films d1 , d2 , and d4 are respectively formed on the sealing surface 5 a , the outer peripheral surface 5 b , and the inner peripheral surface 5 d of the rotary ring 5 . The diamond films d1, d2, and d4 are formed successively with each other. In this case, the frictional heat generated on the sealing surface 5a serving as the sliding surface of the rotary ring 5 can be quickly conducted to the The inner peripheral side and the outer peripheral side of the rotary ring 5 can more effectively relax the temperature difference between the sealing surface 5 a, the outer peripheral surface, and the inner peripheral surface of the rotary ring 5 .

[0059] In addition, in this embodiment, similar to the first embodiment, a heat transfer ring 37 is provided on the outer periphery of the diamond film d2...

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PUM

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Abstract

A floating ring mechanical seal wherein a floating ring is sandwiched and held between a rotating ring, which is provided on a rotary shaft, and a stationary ring, which is provided on a seal case so as to be movable in the axial direction and biased in the direction of the rotating ring, and the floating ring is prevented from rotating relative to the stationary ring. The rotating ring is manufactured from a sintered compact of SiC or cemented carbide. A diamond film is formed on the rotating ring, on the sealing surface that slides against the floating ring. A diamond film continuous with the diamond film on the sealing surface is formed on the outer circumferential surface of the rotating ring and on the back surface of the rotating ring, that is, the surface on the side opposite the sealing surface.

Description

technical field [0001] The present invention relates to floating ring mechanical seals. More specifically, it relates to a floating ring type mechanical seal in which a floating ring is clamped and held between a rotating ring provided on a rotating shaft and a stationary ring provided on a seal box. Background technique [0002] For example, as a shaft seal unit used under high pressure and high temperature conditions, such as the BFP (Boiler Feed Pump) that supplies water to the boiler of a thermal power plant, various floating ring mechanical seals have been proposed (for example, refer to Patent Documents 1 to 2). ). [0003] Such as Figure 5 As shown, such a floating ring mechanical seal has: a rotating ring 102 disposed on a rotating shaft 101 ; a stationary ring 104 disposed on a seal case 103 ; and a floating ring 105 . The stationary ring 104 can be along the axis direction ( Figure 5 Center is the left-right direction) and is installed in the sealing box 103 in...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): F16J15/34F04B39/00F04B53/00
CPCF04B39/00F04B53/00F16J15/3472F16J15/3484F16J15/3496F04B53/143F16J15/3452
OwnerNIPPON PILLAR PACKING CO LTD