JP2001141073A - Sealing structure of rotary body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely prevent a leakage of oil to the outside so as to improve the reliability in a sealing structure of a rotary body. SOLUTION: A shaft end part of a rotary shaft 27 is arranged in such a way that it enters the inside through an opening part 28 of a partitioning lid 16 attached to a cylindrical case 15. An oil seal 31 which comes into pressure- contact with an outer peripheral face of the rotary shaft 27 to prevent a leakage of oil to the outside is mounted in the opening part 28. A bearing metal 32 supporting the outer peripheral face of the rotary shaft 27 is mounted in such a way that it is positioned on the outside of the oil seal 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body sealing structure provided between a rotating shaft of a blower fan and a casing.

[0002]

2. Description of the Related Art FIG. 3 shows a cross section of a high-temperature gas fan showing a conventional rotary body sealing structure.

In a general high-temperature gas fan, as shown in FIG.
The clutch case 103 is attached via the. Rotating shaft 104 of a blower (not shown) provided in bearing case 101
Penetrates into the clutch case 103 through the back case 102, the inner ring 105 is fixed to the rotating shaft 104, and the screw pump 106 is attached. An outer ring 108 is rotatably supported by a bearing 107 on an outer peripheral portion of the inner ring 105, and a rotational force of the outer ring 108 can be transmitted to the inner ring 105 by a cam clutch 109 interposed between the inner ring 105 and the outer ring 108. Has become. Then, a chain wheel 110 is fixed to the outer ring 108. On the other hand, a rotating shaft 112 of a turning motor (not shown) provided in the turning motor case 111 enters the clutch case 103, and a chain wheel 113 is fixed to the rotating shaft 112.
The three comrades are drivingly connected by a chain 114.

[0004] Further, since the chain wheels 110 and 113, the chain 114 and the like are accommodated in the clutch case 103, lubricating oil is supplied from a supply path (not shown). To prevent leakage, an oil seal 115 is provided in the clutch case 103 at the entry of the rotating shaft 112 of the turning motor. The oil seal 115 includes an annular seal body 116 having a U-shaped cross section and a spring 117, is housed in a housing 118 of the clutch case 103, and has a rotating shaft 11
2 is pressed against the outer peripheral surface.

[0005] Accordingly, when the blower motor is driven, the inner ring 105 located in the clutch case 103 together with the rotating shaft 104.
Are driven to rotate, and oil is circulated by the screw pump 106. At this time, since the cam clutch 109 is a one-way clutch, no rotational force is transmitted from the inner wheel 105 to the outer wheel.
When the drive of the blower motor is stopped, the rotating shaft 104 may be bent downward due to heat, own weight, and the like. Therefore, the rotating shaft 104 is rotated at a low speed by a turning device. That is, when the turning motor is driven, the rotating shaft 112
At the same time, the chain wheel 113 rotates, and the rotational force is transmitted to the chain wheel 110 via the chain 114, and the outer ring 108 rotates. Then, the rotational force of the outer ring 108 is transmitted to the inner ring 105 by the cam clutch 109, and the rotating shaft 104 integrated with the inner ring 105 rotates at low rotation.

[0006]

As described above, the high-temperature gas fan is provided with a turning device for preventing deformation of the rotating shaft 104, and the rotating shaft 112 of the turning motor is attached to the clutch case 103. By providing the oil seal 115 at the portion where the oil enters, external leakage of oil is prevented. In the oil seal 115, a gap S is formed between the housing 118 and the rotating shaft 112 so that only the seal body 116 can be pressed against the outer peripheral surface of the rotating shaft 112 for sealing. However, the base end of the oil seal 115 is attached to the distal end of the clutch case 103 attached to the bearing case 101 via the back case 102. for that reason,
Due to the degree of fastening of the bolts B of the back case 102 and the clutch case 103, the axial center of the oil seal 115 and the rotating shaft 112 is shifted, and the gap S changes in the circumferential direction.
There is a problem in that the 115 does not uniformly contact the outer peripheral surface of the rotating shaft 112, and it is impossible to reliably prevent oil leakage.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a rotary body sealing structure in which external leakage of oil is reliably prevented to improve reliability.

[0008]

According to a first aspect of the present invention, there is provided a seal structure for a rotating body, comprising: a base having a ring shape; a cylindrical portion having a base end attached to the base; A casing formed of a ring-shaped partition lid attached to the tip of the section, and disposed such that the shaft end of the rotating body enters the casing through the opening of the partition lid. An oil seal for preventing oil from leaking to the outside of the casing by being pressed against an outer peripheral surface of the rotating body.

In a second aspect of the present invention, a bearing metal for supporting an outer peripheral surface of the rotating body is mounted on the opening of the partition cover so as to be located outside the oil seal. It is characterized by that.

According to a third aspect of the present invention, there is provided an oil receiving plate for preventing the flow of oil to a pressure contact portion between the outer peripheral surface of the rotating body and the oil seal inside the partition lid. It is characterized by having provided.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a high-temperature gas fan to which a rotary body seal structure according to an embodiment of the present invention is applied, and FIG. 2 is a cross-sectional view illustrating the seal structure of the present embodiment.

In the high-temperature gas fan according to the present embodiment, as shown in FIG.
A base 13 of a cylindrical case 15 constituting a clutch case (casing) is fixed to the base 13 by mounting bolts 14, and a disk-shaped partition lid is provided at a distal end of the base 13. 16 is fixed by mounting bolts 17. The rotating shaft 18 of the blower motor (not shown) provided in the bearing case 11
Through the guide cylinder 19 into the cylindrical case (clutch case) 15 through which the inner ring 20 is fixed at the tip and a screw pump 21 is attached.

A bearing 22 is provided on the outer periphery of the inner ring 20.
The outer ring 23 is rotatably supported by the outer ring 23, and a cam clutch 24 is interposed between the inner ring 20 and the outer ring 23.
The cam clutch 24 is a one-way clutch, and can transmit only the rotational force of the outer wheel 23 to the inner wheel 20.
A pump flange 25 is attached to the outer ring 23 so as to face the screw pump 21. An annular sprocket 26 is fitted and fixed to the outer peripheral portion of the outer ring 23.

On the other hand, a rotating shaft (rotating body) 27 of a turning motor (not shown) provided in the turning motor case 42 enters the cylindrical case 15 through the opening 28 of the partition lid 16, and the tip of the rotating shaft 27 An annular sprocket 29 is fitted and fixed to the portion. This sprocket 29 has substantially the same outer diameter as the sprocket 26, and each sprocket 26, 29 has a chain 30
And are drivingly connected.

Further, since the sprockets 26 and 29, the chain 30 and the like are accommodated in a clutch case composed of the base 13, the cylindrical case 15, and the partition lid 16, lubricating oil is supplied from a supply passage (not shown). It is being supplied. An oil seal 31 and a bearing metal 32 are provided at a portion of the partition lid 16 that penetrates the rotating shaft 27 of the turning motor so that the supplied oil does not leak outside the clutch case.

That is, the outer peripheral portion of the rotating shaft 27 is fitted with the spacer 33 whose surface is hardened by induction hardening to increase the hardness and improve the wear resistance. On the other hand, the partition lid 16
An oil seal 31 is attached to the opening 28 of
The oil seal 31 includes an annular seal main body 34 having a U-shaped cross section and a ring-shaped spring 35. The seal main body 34 has a reinforcing member 36 built therein and a dust seal 37 formed integrally therewith. ing. Also,
An annular groove 38 is formed on the outer surface of the partition lid 16 along the opening 28.
The bearing metal 32 is locked in the annular groove 38 and is fixed by a fixing screw 39.

Accordingly, the oil seal 31 is pressed against the outer peripheral surface of the spacer 33 of the rotating shaft 27 by the spring 35, and the inner peripheral surface of the bearing metal 32 is located almost without any clearance on the outer peripheral surface of the spacer 33. Of the oil from the outside is prevented. Further, the dust seal 37 presses the contact portion between the bearing metal 32 and the spacer 33 to close the gap, thereby preventing the oil from leaking outside and preventing the intrusion of dust from the outside.

An oil receiving plate 40 is fixed to the inside of the partition lid 16 at the outer periphery of the oil seal 31, while the oil receiving plate 40 is fixed to the sprocket 29.
Are integrally formed.
Therefore, the oil adhering to the sprocket 29 and the like flows down from the flange portion 41 to the oil receiving plate 40 and further falls downward, whereby the flow of the oil to the oil seal 31 is suppressed, and the oil outside It can contribute to prevention of leakage.

When the blower motor is driven by the high-temperature gas fan configured as described above, the inner ring 20 located in the cylindrical case 15 is driven to rotate together with the rotating shaft 18, and oil is circulated by the screw pump 21. At this time, since the cam clutch 24 is a one-way clutch, no rotational force is transmitted from the inner race 20 to the outer race 23. When the drive of the blower motor is stopped, the rotating shaft 18 may be bent downward due to heat, own weight, and the like. Therefore, the rotating shaft 18 is rotated at a low speed by a turning device.

That is, when the turning motor is driven, the sprocket 29 rotates together with the rotating shaft 27, and the rotational force is transmitted to the sprocket 26 via the chain 30,
The outer ring 23 rotates. Then, the rotational force of the outer ring 23 is transmitted to the inner ring 20 by the cam clutch 24, and this inner ring 2
The rotation shaft 18 integrated with the shaft 0 rotates at a low rotation.

When the rotary shaft 27 is driven to rotate, lubricating oil is supplied to the sprockets 26 and 29 in the cylindrical case 15.
The oil is supplied to important points such as the oil and chain 30 and flows downward, but on the oil seal 31 side, the oil falls from the flange portion 41 via the oil receiving plate 40, and the oil flows to the oil seal 31. Is suppressed, which can contribute to prevention of external leakage. Since the oil seal 31 is attached to the partition lid 16, the partition lid 16 is fastened to the tip of the cylindrical case 15 regardless of the fastening condition of the mounting bolt 15 for fixing the cylindrical case 15. Accordingly, the axis of the rotary shaft 27 (spacer 33) can be properly adjusted, and the oil seal 31 can be uniformly pressed against the outer peripheral surface of the spacer 33 to reliably prevent oil leakage.

Further, by providing the bearing metal 32 outside the oil seal 31, the gap between the bearing metal 32 and the spacer 33 can be made very small, and the dust seal 37 can be pressed into this gap. The gap is eliminated, so that leakage of oil to the outside can be reliably prevented, and intrusion of dust from the outside can be prevented.

In the above-described embodiment, the rotating body sealing structure of the present invention is applied to the bearing of the rotating shaft 28 of the high-temperature gas fan, but the application site is not limited to this.

[0025]

As described above in detail in the embodiment, according to the seal structure of the rotating body of the first aspect,
A casing is composed of a base having a ring shape, a tubular portion having a base end attached to the base, and a partition lid attached to a distal end of the tubular portion having a ring shape. The oil seal is provided so as to penetrate into the casing through the opening, and the opening is fitted with an oil seal that presses against the outer peripheral surface of the rotating body to prevent oil from leaking to the outside of the casing. Positioning can be set according to the mounting position of the partition lid. By properly adjusting the axes of the two and uniformly pressing the oil seal against the outer peripheral surface of the rotating body, it is possible to reliably prevent oil leakage and improve reliability. Improvement can be achieved.

According to the second aspect of the present invention, the bearing metal for supporting the outer peripheral surface of the rotating body is mounted on the opening of the partition cover so as to be located outside the oil seal. By eliminating the gap between the outer peripheral surface of the rotating body and the bearing metal, the leakage of the oil can be reliably prevented and the reliability can be improved.

According to the third aspect of the present invention, an oil receiving plate is provided inside the partition lid to prevent oil from flowing to the pressure contact portion between the outer peripheral surface of the rotating body and the oil seal. As a result, the lubricating oil in the casing falls through the oil receiving plate, which suppresses the flow of the oil to the oil seal and contributes to prevention of external leakage, thereby improving the durability of the oil seal. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a high-temperature gas fan to which a rotary body sealing structure according to an embodiment of the present invention is applied.

FIG. 2 is a cross-sectional view illustrating a seal structure of the embodiment.

FIG. 3 is a cross-sectional view of a high-temperature gas fan showing a conventional rotating body sealing structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Base 15 Cylindrical case (casing) 16 Partition lid 18 Rotating shaft 20 Inner ring 21 Screw pump 23 Outer ring 24 Cam clutch 25 Pump flange 26, 29 Sprocket 27 Rotating shaft (rotating body) 28 Opening 30 Chain 31 Oil seal 32 Bearing metal 40 Oil receiving plate 42 Turning motor case

Claims (3)

[Claims] 1. A casing comprising a ring-shaped base, a cylindrical part having a base end attached to the base, and a ring-shaped partition lid attached to a distal end of the cylindrical part, and a shaft of a rotating body. An oil seal disposed such that an end thereof enters into the casing through an opening of the partition lid, and presses against the opening to an outer peripheral surface of the rotating body to prevent oil from leaking out of the casing; The seal structure of the rotating body, characterized by being mounted with. 2. The seal structure for a rotating body according to claim 1, wherein a bearing metal for supporting an outer peripheral surface of the rotating body is mounted on an opening of the partition cover so as to be located outside the oil seal. A rotating body sealing structure, characterized in that: 3. The seal structure for a rotating body according to claim 1, wherein an oil receiving plate for preventing oil from flowing to a press-contact portion between an outer peripheral surface of the rotating body and the oil seal is provided inside the partition lid. A seal structure for a rotating body, which is provided.