JPS598038Y2 - Shaft seals of submersible pumps, etc. - Google Patents

Description

[Detailed explanation of the idea] (1) Purpose of the idea The present invention relates to a shaft seal of a submersible pump or the like.

As is well known, the shaft seal of a submersible pump or the like is easily damaged by solid matter such as sand grains contained in absorbed water.

The purpose of the present invention is to provide a shaft seal that is highly durable because the sliding surfaces of the fixed sealing ring and the rotating sealing ring are protected from solid objects such as sand particles, and has good workability during assembly. be.

(2) Structure of the invention In the shaft sealing portion of a submersible pump or the like according to the invention, a rotating sealing ring is supported by a rotating lip in a seal box, and a fixed sliding surface facing a rotating sliding surface of the rotating sealing ring is provided. An elastic annular tongue piece having a cross-sectional shape sloping from inward to outward is extended to the hole edge of the fixed sheet supporting a fixed sealing ring having an integral structure with the fixed sheet, and the annular tongue piece is integrated with the fixed sheet. Due to its own elasticity, its inner periphery forms an external liquid flow prevention surface that comes into close contact with the rotating shaft.

To explain the drawings, reference numeral 1 denotes a rotary sealing ring supported on a rotary lip 3 in a seal box 2, and 4 a fixed sealing ring having a fixed sliding surface 6 facing the rotating sliding surface 5 of the rotary sealing ring 1. , 7 is a fixed sheet that supports the fixed sealing ring 4, and a resilient annular tongue piece 8 having a cross-sectional shape that slopes from inward to outward is attached to the hole edge of the fixed sheet 7. An external liquid flow prevention surface 10 is formed which is extended by being integral with the main body portion and whose inner peripheral edge is brought into close contact with the rotating shaft 9 due to the elasticity of the annular tongue piece 8 itself.

The pressure inside the seal box 2 is higher than the external pressure, and the injected fluid leaks little by little from between the rotating sliding surface 5 and the fixed sliding surface 6, and further passes through the external liquid flow prevention surface 10. However, the external liquid flow prevention surface 10 extends a resilient annular tongue piece 8 having a cross-sectional shape that is inclined from the inside to the outside at the hole edge of the fixed seat 7. Since the inner circumferential edge is configured to be in close contact with the rotating shaft 9, the leakage of the injected fluid to the outside is further promoted, and external fluid is prevented from flowing into the seal box 2. It acts to prevent it.

(3) Effects of the invention According to the invention, even if solid matter such as sand grains is contained in the external fluid, it will not only be blocked by the external liquid drift prevention surface 10 and cannot enter the seal box 2. , will be repelled by the fluid that is about to leak to the outside from the blocking surface 10.

Therefore, the rotating sliding surface 5 and the fixed sliding surface 6 in the seal box 2 are not damaged.

The annular tongue piece 8 in the present invention is not made as a separate structure and overlapped with the fixed seat 7, but is extended by an integral structure with the main body of the fixed seat 7, and is used as a garter spring or the like. Since the inner periphery of the tongue piece 8 comes into close contact with the rotating shaft 9 due to the elasticity of the tongue piece 8 itself without the need for attachment, the number of parts is reduced and workability during assembly is improved, and the mounting dimensions are also reduced. It has the advantage of being able to shorten and shorten the length.

[Brief explanation of drawings]

FIG. 1 is a half-sectional view of the shaft seal of the present invention, and FIG. 2 is a half-sectional view of a fixing sheet in the shaft seal of the present invention. 1... Rotating sealing ring, 2... Seal box, 3... Rotating lip, 4... Fixed sealing ring, 5... Rotating Sliding surface, 6... Fixed sliding surface, 7... Fixed sheet, 8...
Resilient annular tongue piece, 9...rotation shaft, 10...
...External liquid inflow prevention surface.

Claims (1)

[Scope of utility model registration request] A fixed seat 7 supports a rotary seal ring 4 in which the rotary seal ring 1 is supported on a rotary lip 3 in a seal box 2 and has a fixed sliding surface 6 facing the rotary sliding surface 5 of the rotary seal ring 1. An elastic annular tongue piece 8 having a cross-sectional shape slanting from the inside to the outside is extended at the hole edge by an integral structure with the fixing sheet 7, and the elasticity of the annular tongue piece 8 itself A shaft sealing part for a submersible pump or the like, which has an external liquid flow prevention surface 10 whose inner peripheral edge is in close contact with a rotating shaft 9.