JPH0653860U - Shaft seal device - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] A shaft sealing device applied to the rotary shaft penetrating portion of turbomachines such as water turbines. The present invention does not require an auxiliary machine for fresh water supply, which makes it compact and elastic. Improves the sealing performance, and further eliminates the need for adjusting the contact pressure of the sealing surface. [Structure] The rotary shaft 1 and the fixed casing 2 are constituted by seal rings 8 and 9 divided into a plurality of parts via seal housings 3 and 6 such that the end faces of the respective seal rings are brought into contact pressure and slide. A shaft sealing device in which an elastic body 10 is installed in a divided portion of a seal ring.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shaft sealing device applied to a rotary shaft penetrating portion of a turbomachine such as a water turbine or a pump.

[0002]

[Prior art]

 FIG. 6 is a structural explanatory view of a conventional shaft sealing device. In FIG. 6, a shaft sealing device is generally used in a shaft penetrating portion of a rotary fluid machine such as a water turbine or a pump, and seals the pressure fluid 13 from leaking from the shaft penetrating portion.

That is, the gland packing 18 is inserted between the seal box 15 attached to the casing 14 and the sleeve 17 attached to the rotating rotary shaft 16, and the packing retainer 19 is fixed by the bolt 20. The pressure fluid 13 is sealed by tightening and applying a surface pressure to the sealing surface S.

In order to prevent abnormal wear of the gland packing 18 and the sleeve 17 due to foreign matter contained in the pressure fluid 13, fresh water is supplied from the auxiliary equipment 21 for fresh water supply to the intermediate ring 22 of the gland packing 18 to wash away the foreign matter. At the same time, the sliding parts are lubricated to prevent seizure.

When the pressure fluid 13 leaks more than the specified amount, the bolt 20 is tightened and the packing holding member 19 is pushed in for adjustment.

[0006]

[Problems to be solved by the device]

 As described above, the conventional shaft sealing device requires an auxiliary machine for supplying fresh water in order to lubricate the gland packing 18 and prevent foreign matter from entering, and the shaft sealing device is becoming larger.

Further, in order to keep the leakage of the pressure fluid 13 within the specified amount, adjustment such as retightening of the gland packing 18 is always required, and operation management is complicated.

Further, a large amount of gland packing 18 is inserted around the outer circumference of the rotating shaft 16 and tightened to seal the pressure fluid 13. Therefore, in order to seal the shaft rotating at high speed and high pressure fluid, It is necessary to increase the amount of coating, seizure due to insufficient lubrication, and abnormal wear that is likely to occur due to exceeding the limit of lubrication characteristics of the material of the gland packing 18, and foreign matter contained in the pressure fluid 13 may cause the gland packing 18 or The sleeve 17 is worn or damaged, resulting in a short life, frequent replacement, and difficult maintenance. There was a problem such as.

[0009]

[Means for Solving the Problems]

 The shaft sealing device according to the present invention is intended to solve the above-mentioned conventional problems, and a rotary shaft and a fixed casing are divided into a plurality of seal rings through a seal housing. Is a shaft sealing device that is configured to contact and slide relative to each other, and has an elastic body installed at least at the divided portions of each seal ring.

[0010]

[Action]

 That is, in the shaft seal device according to the present invention, a plurality of divided rotary seal rings are inserted into a rotary seal housing attached to a rotary shaft, and a plurality of divided fixed seal rings are brought into contact with the end face of the rotary seal ring. Inserted in fixed seal housing. The pressure fluid is sealed by the relative sliding surfaces of the rotary seal ring and the fixed seal ring.

Since the pressure fluid is hermetically sealed at the end faces, if a mechanism such as a spring is used so that a pressing force is constantly applied to the end faces, the end faces of the rotary seal ring and the fixed seal ring will wear due to sliding. Even if the pressing force is automatically maintained, the fluid is sealed.

Further, since the contact pressure length of the relative sliding surface in the radial direction is short, the sliding surface is sufficiently lubricated by the pressure fluid and seizure is hard to occur. If the seal ring is made of a high hardness material, it is against foreign matter. Even if it does not wear.

Further, since the plurality of seal rings and the seal housing into which the seal rings are inserted are divided into two, even if the rotary shaft is long or the rotary shaft has projections or other components, the rotary shaft It is not necessary to insert the one from one side into the seal housing, and the divided parts can be easily assembled by integrating the divided parts at a necessary portion.

Leakage of pressure fluid from the divided seal ring and the gap between the divided faces of the seal ring is prevented by an elastic body installed so as to be in close contact with the divided portion of the seal ring, and a low-leakage shaft sealing device is configured. It

[0015]

【Example】

 1 is a rotary shaft, 2 is a fixed casing, 3 is a rotary seal housing which is fixed to the rotary shaft 1 with a set screw 4 and is tightened by a bolt 5, and is divided into two. 6 is a fixed casing 2 via an O-ring 7. Fixed seal housings, which are installed in the rotary seal housing 3 and the fixed seal housing 6 and are fixed in the rotary seal housing 3 and the fixed seal housing 6, respectively. An elastic body installed at a divided portion of the seal ring 8 and the fixed seal ring 9, 11 is a spring that presses the end faces of the rotary seal ring 8 and the fixed seal ring 9, and 12 is an O between the rotary shaft 1 and the fixed seal housing 3. The ring 13 is a pressure fluid.

1 to 3 are structural explanatory views of a shaft sealing device according to a first embodiment of the present invention.

The shaft sealing device according to the first embodiment is used in a rotary shaft penetrating portion of a water turbine and seals a pressure fluid so as not to flow out from the shaft penetrating portion. As shown in FIG. 1, a rotary seal housing 3 divided into two parts is integrally assembled with a bolt 5 and fixed to a rotating rotary shaft 1 with a set screw 4.

A rotary seal ring 8 divided into eight parts is attached to the rotary seal housing 3 as shown in FIG. A fixed seal ring 9 divided so as to come into contact with the end surface of the rotary seal ring 8 is attached to the fixed seal housing 6, and the fixed seal housing 6 is attached to the fixed casing 2 in the axial direction via an O ring 7 and a spring 11. It is mounted so that it can be moved.

A relative sliding surface formed by the rotary seal ring 8 and the fixed seal ring 9 is constantly contacted by a spring 11. The pressure fluid 13 is sealed at its relative sliding surface.

An elastic body 10 is installed on the outer circumference of both the rotary seal ring 8 and the fixed seal ring 9, and as shown in FIG. 3, a gap h between the rotary seal ring 8 and the fixed seal ring 9 is divided. The pressure fluid 13 that tends to flow in the direction of arrow A is sealed by the elastic body 10.

If both the rotating side and stationary side seal rings are made of high hardness material, there will be no wear against foreign matters, no fresh water supply auxiliary equipment is needed, and the sealing surface is formed by pressing with a spring. It does not require management such as retightening such as packing, and because it is a split type while improving the sealing performance with an elastic body, it can be integrated at necessary parts, no rotation shaft insertion is required, and assembly and disassembly are possible. It is easy and maintainability is greatly improved.

FIG. 4 is a partial explanatory view of the second embodiment of the present invention. Although FIG. 4 shows the fixed side, the same effect can be obtained on the rotating side. The fixed seal ring 8'is divided into a hook shape, and an elastic body 10 'is installed on the joint surface of the divided portion. In the flow of the pressure fluid 13 in the direction indicated by the arrow B in the figure, the elastic body 10 'is tightly adhered to the dividing surface to prevent leakage. 6'is a fixed seal housing.

FIG. 5 is a partial explanatory view of the third embodiment of the present invention. Although FIG. 5 shows the fixed side, the same effect can be obtained on the rotating side. The fixed seal ring 8 "and the fixed seal ring 8" have a structure in which an elastic body 10 "is partially installed on the outer peripheral portion of the divided surface to cut out the fixed seal housing 6". In the flow of the pressure fluid in the direction indicated by the arrow C in the figure, the elastic body 10 ″ comes into close contact with the dividing surface to prevent leakage.

[0024]

[Effect of device]

 The shaft sealing device according to the present invention is configured as described above, and does not require an auxiliary machine for supplying fresh water for sealing the shaft penetrating portion of the casing of the rotating rotary shaft. It does not need to be upsized, and because the sealing surface is formed by holding the end faces of the seal ring in contact with each other, adjustment is not required and operation management is easy.

Further, since it is a split type, it can be integrated at necessary parts, is easy to assemble and disassemble, and is greatly improved in maintainability. The divided parts are hermetically sealed with an elastic body.While improving the sealing performance, the radial contact pressure length of the sealing ring is also short, so lubrication with pressure fluid is sufficient, and seizure, wear and damage of the sliding part occur. Since it does not exist, the life of the shaft sealing device is long and the frequency of replacement is low. And so on.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shaft sealing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged perspective view of a Y portion of FIG.

FIG. 4 is a partially enlarged perspective view of a second embodiment of the present invention.

FIG. 5 is a partially enlarged perspective view of a third embodiment of the present invention.

[Explanation of symbols]

 1 rotary shaft 2 fixed casing 3 rotary seal housing 4 set screw 5 bolts 6, 6 ', 6 "fixed seal housing 7 O-ring 8, 8', 8" rotary seal ring 9 fixed seal ring 10, 10 ', 10 "elasticity Body 11 Spring 12 O-ring 13 Pressure fluid

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[Procedure amendment]

[Submission date] October 4, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a shaft sealing device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an enlarged perspective view of a Y portion of FIG.

FIG. 4 is a partially enlarged perspective view of a second embodiment of the present invention.

FIG. 5 is a partially enlarged perspective view of a third embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a conventional shaft sealing measure.

[Explanation of reference symbols] 1 rotary shaft 2 fixed casing 3 rotary seal housing 4 set screw 5 bolts 6, 6 ', 6 "fixed seal housing 7 O-ring 8, 8', 8" rotary seal ring 9, fixed seal ring 10, 10 ', 10' 'Elastic body 11 Spring 12 O-ring 13 Pressure fluid

Claims (1)

[Scope of utility model registration request] 1. A seal ring divided into a plurality of parts on a rotary shaft and a fixed casing via a seal housing is configured such that the end faces of the respective seal rings are in relative contact pressure and slide, and at least the respective seal rings. A shaft sealing device, characterized in that an elastic body is installed in a divided portion of the shaft.