JPH0684065U - Segment seal - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a segment seal that does not deteriorate in sealing property even when distortion or the like occurs. [Structure] An O-ring 10 is interposed between the contact surfaces of a segment ring 4 and a seal flange 3, and the O-ring 10 and a seal end surface 7 ′ seal between the segment ring 4 and the seal flange 3.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a segment seal.

[0002]

[Prior art]

 In the segment seal, the seal ring fitted on the rotary shaft forms a sliding seal surface by sliding contact with the rotary shaft, and the end face of the seal ring makes non-sliding contact with the seal flange to form the seal end face. It is a device that seals by doing. FIG. 4 shows an example thereof. In this example, the left and right double seals have the same structure. Two segment rings 4 are fitted on the rotary shaft 2 and the segment rings 4 are pressed against the seal flange 3 by the spring 9. Has become. Further, the segment ring 4 is engaged with the seal box 1 by a pin or the like (not shown) to prevent rotation, so that the segment ring 4 does not rotate. The inner peripheral surface of the segment ring 4 is in sliding contact with the rotating rotary shaft 2 to form a sliding seal surface 8. The end face of the segment ring 4 is pressed by the seal flange 3 by the spring 9 to form the seal end face 7. A seal end face 7 is also formed between the segment ring 4 and the segment ring 4. The segment seal is sealed by the seal end face 7 and the sliding seal face 8.

[0003]

[Problems to be solved by the device]

 The sliding seal surface 8 fits on the outer peripheral surface of the rotating shaft 2 as it is used by sliding with the rotating shaft 2, and the leakage from the sliding seal surface 8 gradually decreases. Since it does not slide with 3, it does not fit in with the seal flange 3 and leakage does not decrease with use. In addition, the sliding end face 7 is distorted due to the sliding heat generated on the sliding end face 8, and conversely the leakage from the end face 7 is gradually increased. The present invention aims to solve the above-mentioned problems of the prior art.

[0004]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises a seal ring fitted to a rotary shaft and a seal flange, and forms a sliding seal surface by sliding contact with the rotary shaft. A segment seal in which a seal end face is formed by sliding contact, wherein a seal material having elasticity is interposed between the seal ring and the seal flange.

[0005]

[Action]

 The elasticity of the seal material compensates for the distortion of the end faces of the segment ring and improves the sealing performance between the end faces of the segment ring and the seal flange.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view, and this embodiment has a double seal structure in which the same structure is formed on the left and right inside a seal box 1. Seal flanges 3 are provided on the left and right sides of the seal box 1, and a gas introduction port 6 is provided at the center of the seal box 1 so that the purge gas is introduced into the inside of the seal box 1. .

Inside the seal box 1, two segment rings 4 and 4 are provided on the left and right respectively. The segment rings 4 and 4 are made of carbon or a fluorine resin containing a filler. The segment rings 4 and 4 are fitted on the rotary shaft 2 and, at the same time, pressed against the seal flange 3 by a spring 9. Further, it is locked to the seal box 1 by a non-rotating pin (not shown) so as not to rotate. The segment rings 4 and 4 form a sliding seal surface 8 between the rotary shaft 2 and a seal end surface 7 between the segment ring 4 and the segment ring 4, which does not come into sliding contact. . Reference numeral 5 is a spring that binds the segment rings 4.

A groove 30 is formed on the surface of the seal flange 3 that comes into contact with the segment ring 4, and an O-ring 10 that is a seal material made of an elastic material such as synthetic rubber is interposed in the groove 30. The segment ring 4 directly contacts the seal flange 3 to form a seal end surface 7 ′, and also contacts the O-ring 10 to perform sealing.

In the above configuration, even if the segment ring 4 and the seal end face 7 ′ are distorted by the sliding heat of the slide seal face 8 or the like, the strain is compensated by the O-ring 10 and the seal end face 7 ′ is compensated. The sealability of the 'does not deteriorate.

FIG. 2 shows an embodiment in the case of a single structure and using one segment ring 4. Even with such a simple structure, the O-ring 10 can maintain good sealing performance.

FIG. 3 shows an example in which a lip seal 11 is used as a sealing material having elasticity. In the case of this embodiment, the groove on the outer circumference of the segment ring 4 is deepened so that the spring 5 does not project to the outer circumference side, and the lip seal 11 is fitted on the outer circumference of the segment rings 4, 4. Then, the lip 12 of the lip seal 11 is brought into contact with the seal flange 3 to perform sealing with the seal end face 7 '.

[0012]

[Effect of device]

 As described above, the present invention is provided with a seal ring fitted to a rotary shaft and a seal flange, forms a sliding seal surface by sliding contact with the rotary shaft, and does not slide with the seal flange. In the segment seal that contacts to form the seal end surface, the seal material having elasticity is interposed between the seal ring and the seal flange, so that the sealability between the segment ring end surface and the seal flange is improved and the segment Even if heat distortion occurs in the tring, the sealing property can be maintained.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention.

FIG. 2 is a half sectional view showing another embodiment of the present invention.

FIG. 3 is a half sectional view showing still another embodiment of the present invention.

FIG. 4 is a half sectional view showing an example of a conventional segment seal.

[Explanation of symbols]

1: seal box, 2: rotary shaft, 3: seal flange, 4: segment ring, 5: spring, 6: gas inlet, 7.7 ': seal end face, 8: sliding seal face, 9: spring, 10 : O-ring, 11: Lip seal, 1
2: Lip, 30: Groove.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yukio Ishii 3-14-15 Yaguchi, Ota-ku, Tokyo Coal-Ken Seiko Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A seal ring fitted to a rotary shaft, and a seal flange, wherein a sliding seal surface is formed by sliding contact with the rotary shaft and a non-sliding contact with the seal flange is performed. In the segment seal forming the end face, a seal material having elasticity is interposed between the seal ring and the seal flange. 2. The seal material is an O-ring.
The segment seal described in. 3. The segment seal according to claim 1, wherein the seal material is a lip seal.