机械密封用O形橡胶圈(摘自JB/T 7757.2-1995)
O形圈的尺寸和公差
注:* 表示常用尺寸。
13.8
|
±0.17
|
15.8
|
±0.17
|
16
|
±0.17
|
17.8
|
±0.17
|
18
|
±0.17
|
19.8
|
±0.22
|
20
|
±0.22
|
21.8
|
±0.22
|
22
|
±0.22
|
23.7
|
±0.22
|
24.7
|
±0.22
|
25.7
|
±0.22
|
26.3
|
±0.22
|
27.7
|
±0.22
|
28.3
|
±0.22
|
29.7
|
±0.22
|
30.3
|
±0.30
|
31.7
|
±0.30
|
32.3
|
±0.30
|
32.7
|
±0.30
|
33.3
|
±0.30
|
34.7
|
±0.30
|
36.3
|
±0.30
|
37.7
|
±0.30
|
38.3
|
±0.30
|
39.7
|
±0.30
|
41.3
|
±0.30
|
42.7
|
±0.30
|
43.3
|
±0.30
|
44.7
|
±0.30
|
47.7
|
±0.30
|
48.4
|
±0.30
|
49.7
|
±0.30
|
50.4
|
±0.30
|
52.4
|
±0.45
|
53.4
|
±0.45
|
54.4
|
±0.45
|
55.4
|
±0.45
|
57.6
|
±0.45
|
58.4
|
±0.45
|
59.6
|
±0.45
|
61.4
|
±0.45
|
62.6
|
±0.45
|
64.4
|
±0.45
|
64.6
|
±0.45
|
66.4
|
±0.45
|
67.6
|
±0.45
|
69.4
|
±0.45
|
69.6
|
±0.45
|
71.4
|
±0.45
|
72.6
|
±0.45
|
74.4
|
±0.45
|
74.6
|
±0.45
|
76.4
|
±0.45
|
79.6
|
±0.45
|
80.1
|
±0.65
|
82.1
|
±0.65
|
84.6
|
±0.65
|
85.1
|
±0.65
|
87.1
|
±0.65
|
89.6
|
±0.65
|
94.1
|
±0.65
|
94.6
|
±0.65
|
99.1
|
±0.65
|
99.6
|
±0.65
|
104.1
|
±0.65
|
104.6
|
±0.65
|
109.1
|
±0.65
|
109.6
|
±0.65
|
114.1
|
±0.65
|
114.6
|
±0.65
|
119.6
|
±0.90
|
124.1
|
±0.90
|
124.6
|
±0.90
|
134.1
|
±0.90
|
1.80±0.08
|
2.65±0.09
|
3.10±0.10
|
3.55±0.10
|
4.10±0.10
|
4.50±0.10
|
4.70±0.10
|
5.30±0.13
|
5.70±0.13
|
6.40±0.15
|
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*
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常用O形圈的橡胶材料及代号
种类
|
代号
|
丁腈橡胶(NBR)
|
P
|
乙丙橡胶(EPR)
|
E
|
氟橡胶(FPM)
|
V
|
硅橡胶(MVQ)
|
S
|
各种橡胶材料的主要特点及使用温度
种类
|
主要特点
|
工作温度/℃
|
丁腈橡胶
|
耐油
|
-30~100
|
乙丙橡胶
|
耐放射性、耐碱
|
-50~150
|
氟橡胶
|
耐油、耐热、耐腐蚀
|
-20~200
|
硅橡胶
|
耐寒、耐热
|
-60~230
|
各种橡胶材料的物理性能
注:O形圈外观质量应符合GB 3452.2的规定。
项目
|
丁腈橡胶
|
乙丙橡胶
|
氟橡胶
|
硅橡胶
|
邵氏硬度/度
|
70±5
|
70±5
|
70±5
|
60±5
|
拉伸强度/MPa
|
≥11
|
≥10
|
≥10
|
≥5
|
扯断深长率(%)
|
≥220
|
≥250
|
≥200
|
≥200
|
压缩永久变形(%)|空气100℃×24h
|
≤35
|
≤35
|
—
|
—
|
压缩永久变形(%)|空气200℃×22h
|
—
|
—
|
≤50
|
≤60
|
热空气老化(100℃×24h):硬度变化/度
|
≤+10
|
—
|
—
|
—
|
热空气老化(100℃×24h):拉伸强度变化(%)
|
≤-15
|
—
|
—
|
—
|
热空气老化(100℃×24h):扯断深长率变化(%)
|
≤-35
|
—
|
—
|
—
|
热空气老化(150℃×24h):扯断深长率变化(%)
|
—
|
≤-20
|
—
|
—
|
热空气老化(200℃×24h):硬度变化/度
|
—
|
—
|
≤(0~+10)
|
—
|
热空气老化(200℃×24h):拉伸强度变化(%)
|
—
|
—
|
≤-20
|
—
|
热空气老化(200℃×24h):扯断深长率变化(%)
|
—
|
—
|
≤-30
|
≤-20
|
耐液体:1#标准油(100℃×24h):硬度变化/(°)
|
-3~+7
|
—
|
—
|
—
|
耐液体:1#标准油(100℃×24h):体积变化(%)
|
-8~+6
|
—
|
—
|
—
|
耐液体:1#标准油(150℃×24h):体积变化(%)
|
—
|
—
|
-3~5
|
—
|
脆性温度/℃
|
≤-40
|
≤-55
|
≤-25
|
≤-65
|