JP2004132424A - Shaft sealing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shaft sealing device suitable for a submersible pump, in particular, having low cost and good assembling workability without manufacturing a special shaft, and holding its sealing performance without the abnormal wear of a shaft even in liquid including sand and slurry, the residence of the liquid in a circular gap on the outer periphery of a shaft guide-down portion and the face roughness and opening due to the accumulation of deposits resulting in the poor start of the pump or biting between sliding faces. <P>SOLUTION: A fixed sealing ring 6 is supported by a housing 1, the shaft guide-down portion 7 is loosely fitted to the fixed sealing ring 6 and a shaft through-hole 4 to hold a circular gap 8 at its outer periphery, and a rotary sealing ring 9 is fitted to the shaft guide-down portion 7 so that it is rotated right over the fixed sealing ring 6 together with the shaft and has slide contact with the fixed sealing ring 6 with spring energizing force. A stirring edge 13 extending decliningly to the rotating direction of the shaft is formed on inner peripheral face of one or both of the fixed sealing ring 6 facing the circular gap 8 and the shaft through-hole 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shaft sealing device mounted on a submersible pump or the like.
[0002]
[Prior art and its problems]
As is well known, in a submersible pump, generally, a shaft through-hole is formed in the center of a partition wall interposed between a pump vortex chamber and an oil chamber, and an annular groove recessed on the outer periphery of the upper end of the through-hole is provided. A fixed sealing ring of the shaft sealing device is fitted, and an annular gap is provided on the outer periphery of the fixed sealing ring and the shaft guiding portion loosely fitted in the shaft through-hole. The rotating seal ring is fitted to the lower portion of the shaft guide so as to be in sliding contact with the fixed seal ring by force, but the liquid retained in the annular gap precipitates solids due to sliding heat and the like, and the deposits are fixed. It adheres to the inner circumference of the seal ring and the shaft through-hole and accumulates and causes a start failure of the pump. In addition, the above-mentioned deposits are caught between the sliding contact surfaces of the fixed seal ring and the rotary seal ring, and the surface is caught. Seal performance due to roughening and face opening It will be inhibited. In order to solve such a problem, there is a method in which a spiral groove is formed on the outer periphery of the shaft guiding lower portion so as to push out the precipitate to the pump chamber side by a screw pump action accompanying rotation of the shaft (for example, Patent Document 1). 1).
[0003]
[Patent Document 1]
JP 2000-274380 A (FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in the structure of Patent Document 1, a general-purpose shaft cannot be used, and it is necessary to manufacture a special-purpose shaft. Therefore, the cost increases and the strength of the shaft remains problematic. In addition, there is also a difficulty in assembling such that the auxiliary member such as the O-ring is easily damaged by the spiral groove when the rotary seal ring is assembled. Further, according to the structure of Patent Document 1, it is suitable for use in a highly viscous liquid such as oil, but if it is used in a liquid containing sand, slurry, etc. as in a construction site, the shaft can be used. The engraved spiral groove causes abnormal wear and causes an early breakage accident of the shaft. In addition, the repair work associated with the wear of the spiral groove is a major repair in which the entire shaft is replaced, requiring a large repair cost.
[0005]
The present invention solves the above-mentioned problems, does not require a special-purpose shaft to be manufactured, uses a general-purpose shaft, does not reduce the strength, can be easily assembled at low cost, and can use sand or slurry. There is no abnormal wear of the shaft due to the agitation, the liquid in the annular gap around the lower part of the shaft guide is agitated to prevent stagnation, and the pump does not start poorly due to the accumulation of deposits, and bites between the sliding surfaces. It is an object of the present invention to provide a shaft sealing device that maintains sealing performance without causing surface roughness or surface opening due to the above, and is particularly suitable for a submersible pump.
[0006]
Configuration of the Invention
In the shaft sealing device according to the first aspect of the present invention, an annular groove is recessed outside the upper end of the shaft through-hole to form a housing for supporting a fixed sealing ring, and the fixed sealing ring of the shaft sealing device is connected to the annular groove. And the lower portion of the prime mover is loosely fitted to the fixed sealing ring and the shaft through-hole to have an annular gap around its outer periphery, and is rotated together with the shaft immediately above the fixed sealing ring and fixed by a spring bias. A rotary seal ring is fitted to the lower portion of the shaft so as to be in sliding contact with the seal ring, and a stirring edge extending downwardly in the direction of rotation of the shaft has a stirring edge formed in the fixed seal ring or the shaft through hole facing the annular gap. It was formed on the peripheral surface. Further, in the shaft sealing device according to the second aspect of the present invention, a ring groove is recessed outside the upper end of the through hole between the shafts to constitute a housing for fixed sealing ring support, and the fixed sealing ring of the shaft sealing device is formed. The lower portion of the prime mover is loosely fitted into the fixed sealing ring and the shaft through hole so as to have an annular gap around the outer periphery thereof. The rotating seal ring is fitted to the lower portion of the shaft so as to be in sliding contact with the fixed seal ring by biasing, and the stirring ring extending downwardly in the direction of rotation of the shaft has a stirring edge facing the annular gap and the shaft. It was formed on the inner peripheral surface of the through hole.
[0007]
【Example】
Hereinafter, description will be made with reference to the examples of FIGS.
[0008]
Reference numeral 1 denotes a partition wall interposed between the pump chamber 2 and the oil chamber 3, and a ring groove 5 is recessed outside the upper end of a shaft through hole 4 formed in the center to constitute a housing for a fixed seal ring support. Then, the fixed sealing ring 6 of the shaft sealing device is fitted into the ring groove 5. Reference numeral 7 denotes a shaft guide lower portion of the motor, which is loosely fitted in the fixed sealing ring and the shaft through hole 4 to have an annular gap 8 on its outer periphery. Reference numeral 9 denotes a rotary seal ring which is fitted to the shaft guide portion 7 immediately above the fixed seal ring 6, rotates together with the shaft via the bellows 10 and the retainer 11, and rotates with the fixed seal ring 6 by the spring bias of the coil spring 12. Make sliding contact. Reference numeral 13 denotes a stirring edge for generating a stirring action in the annular gap 8. The stirring edge 13 is provided on the inner peripheral surface of the fixed sealing ring 6 or the shaft through hole 8, or on the inner peripheral surface of the fixed sealing ring 6 and the shaft through hole 8. Is formed so as to be protruded or recessed at a downward gradient in the direction of rotation of.
[0009]
[Action]
When the shaft rotates and the submersible pump is driven, the liquid in the annular gap 8 is agitated by the stirring rim 13 and is pushed out to the pump chamber 2 side, so that the liquid does not stay in the annular gap 8, so that precipitation in the liquid is prevented. In addition to preventing the objects from adhering and accumulating on the inner periphery of the stationary sealing ring 6 and the shaft through-hole 4, the solid substance itself is prevented from being deposited by the cooling action. In addition, accompanying members such as the bellows 10 are not damaged when the rotary seal ring 9 is assembled.
[0010]
【The invention's effect】
According to the shaft sealing device of the present invention, it is not necessary to manufacture a dedicated shaft, the strength is reduced by using a general-purpose shaft, the assembling work is easily performed at low cost, and the outer periphery of the shaft guiding lower portion 7 is formed. The liquid in the annular gap 8 is agitated to prevent stagnation and to provide a cooling action, without causing pump start-up failure due to deposition of deposits, and the sliding contact surface between the fixed sealing ring 6 and the rotary sealing ring 9. The seal performance is maintained without causing surface roughness or opening due to biting between the shafts, and there is no abnormal wear of the shaft against liquids including sand and slurry. There is an advantage that a sealing device can be obtained.
[Brief description of the drawings]
FIG. 1 is a vertical sectional side view of a main part of a shaft sealing device of the present invention mounted on a submersible pump.
FIG. 2 is a vertical sectional side view of a fixed sealing ring in the shaft sealing device of the present invention.
FIG. 3 is a vertical side view of a housing for supporting a fixed sealing ring in the shaft sealing device of the present invention.
FIG. 4 is a longitudinal sectional side view showing a state in which the fixed sealing ring of FIG. 2 is fitted to the housing of FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing for fixed sealing ring support 4 Shaft through-hole 5 Ring groove 6 Fixed sealing ring 7 Shaft guide lower part 8 Annular gap 13 Stirring edge

Claims (2)

An annular groove is recessed on the outer side of the upper end of the shaft through hole to form a housing for supporting a fixed sealing ring, a fixed sealing ring of a shaft sealing device is fitted into the ring groove, and the shaft guide lower portion of the motor is fixed. The rotary seal ring is loosely fitted in the seal ring and the shaft through-hole to have an annular gap on the outer periphery thereof, and is rotated with the shaft immediately above the fixed seal ring so that the rotary seal ring is slidably brought into sliding contact with the fixed seal ring by the bias of the spring. A shaft sealing device, wherein a stirring edge which is fitted and is extended downwardly in a direction of rotation of the shaft is formed on an inner peripheral surface of a fixed sealing ring or a shaft through hole facing the annular gap. . An annular groove is recessed on the outer side of the upper end of the shaft through hole to form a housing for supporting a fixed sealing ring, a fixed sealing ring of a shaft sealing device is fitted into the ring groove, and the shaft guide lower portion of the motor is fixed. The rotary seal ring is loosely fitted in the seal ring and the shaft through-hole to have an annular gap on the outer periphery thereof, and is rotated with the shaft immediately above the fixed seal ring so that the rotary seal ring is slidably brought into sliding contact with the fixed seal ring by the bias of the spring. A shaft sealing device, wherein a stirring edge which is fitted and is extended downwardly in a direction of rotation of the shaft is formed on an inner peripheral surface of a fixed sealing ring facing the annular gap and a shaft through hole. .

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