化工泵总效率的估算
图8-1是根据美国528台化工泵的实验数据绘出的离心泵的总效率和比转速ns。的关系曲线，并以流量为参变量，考虑了泵尺寸大小对泵效率的影响。该效率值可以作为泵设计师评价其设计质量的尺度。但是超过图示效率值是有可能的，这是因为该曲线没有把少数效率很高的泵考虑在内。
表8-3～表8-8是我国制定的标准效率。表中的效率是ns=120～210的效率，当ns<120，ns>210时，泵效率降低，实际泵效率应从表中查得效率中减去效率修正值△η。如果Q和ns。不正好是表内数值时可按插值法确定之。
表8-3单级离心清水泵效率
|
Q／(m3／h) |
5 |
10 |
15 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
|
η％ |
58.0 |
64.0 |
67.2 |
69.4 |
70.9 |
72.0 |
73.8 |
74.9 |
75.8 |
76.5 |
77.0 |
|
Q／(m3／h) |
90 |
100 |
150 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
|
η/％ |
77.6 |
78.0 |
79.8 |
80.8 |
82.0 |
83.0 |
83.7 |
84.2 |
84.7 |
85.0 |
85.3 |
|
Q／(m3／h) |
1000 |
1500 |
2000 |
3 000 |
4 000 |
5000 |
6000 |
7000 |
8000 |
9000 |
10000 |
|
η／％ |
85.7 |
86.6 |
87.2 |
88.0 |
88.6 |
89.0 |
89.2 |
89.5 |
89.7 |
89.9 |
90.0 |
图8-1效率与比转速和流量的关系
表8-4多级离心清水泵效率
|
Q／(m3／h) |
5 |
10 |
15 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|
η／％ |
55.4 |
59.4 |
61.8 |
63.5 |
64.8 |
65.9 |
67.5 |
68.9 |
69.9 |
70.9 |
71.5 |
72.3 |
72.9 |
|
Q(m3／h) |
150 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1500 |
2000 |
3000 |
|
η／％ |
73.5 |
76.9 |
79.2 |
80.6 |
81.5 |
82.2 |
82.8 |
83.1 |
83.5 |
83.9 |
84.8 |
85.1 |
85.5 |
表8-5离心油泵和离心耐腐蚀泵效率
|
Q(m3／h) |
|
10 |
15 |
20 |
25 |
30 |
40 |
50 |
60 |
70 |
80 |
90 |
100 |
|
η／％ |
50.0 |
56.1 |
59.5 |
61.9 |
63.8 |
65.0 |
67.1 |
68.8 |
70.0 |
71.0 |
71.8 |
72.5 |
73.0 |
|
Q／(m3／h) |
150 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
1000 |
1500 |
2000 |
3000 |
|
η／％ |
75.0 |
76.4 |
78.2 |
79.4 |
80.2 |
80.9 |
81.4 |
81.9 |
82.2 |
82.5 |
83.6 |
85.0 |
89.2 |
表8-6单级多级离心清水泵、油泵和耐腐蚀泵效率修正值
ns=20～120效率修正值
|
ns |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
85 |
90 |
95 |
100 |
110 |
120 |
|
Δη／％ |
32 |
25.5 |
24.6 |
17.3 |
14.7 |
12.5 |
10.5 |
9.0 |
7.5 |
6.0 |
5.0 |
4.0 |
3.2 |
2.5 |
2.0 |
1.5 |
1.0 |
0.5 |
0 |
续表
ns=210～300效率修正值
|
ns |
210 |
220 |
230 |
240 |
250 |
260 |
270 |
280 |
290 |
300 |
|
△η／％ |
0 |
0.3 |
0.7 |
1.0 |
1.3 |
1.7 |
1.9 |
2.2 |
2.7 |
3.0 |
表8-7长轴离心深井泵效率(n=110～210)
|
Q/(m3/h) |
5 |
10 |
18 |
30 |
50 |
80 |
130 |
160 |
210 |
340 |
550 |
900 |
1 000 |
1 500 |
|
η/％ |
51.5 |
60.0 |
65.0 |
68.0 |
71.5 |
73.5 |
75.0 |
75.5 |
76.5 |
78.0 |
79.0 |
80.0 |
80.5 |
81.0 |
长轴离心深井泵效率修正值(ns=210～300)
|
ns |
210 |
220 |
230 |
240 |
250 |
260 |
270 |
280 |
290 |
300 |
|
△η/％ |
0.1 |
0.2 |
0.5 |
0.7 |
1.0 |
1.4 |
1.7 |
2.1 |
2.5 |
3.0 |
表8-8小型潜水泵效率(下泵)(ns=120～210)
|
Q／(m3／h) |
1.5 |
3 |
6 |
10 |
15 |
25 |
40 |
65 |
100 |
160 |
|
△η／％ |
42.5 |
53.0 |
61.0 |
66.0 |
69.0 |
72.5 |
75.0 |
77.0 |
78.5 |
80.0 |
小型潜水泵效率(上泵)(ns=120～210)
|
Q／(m3／h) |
6 |
10 |
15 |
25 |
40 |
65 |
100 |
160 |
250 |
|
△η/％ |
59.0 |
63.0 |
66.0 |
69.0 |
71.0 |
73.0 |
74.5 |
75.5 |
76.5 |
小型潜水泵效率修正值
|
ns |
20 |
25 |
30 |
35 |
40 |
45 |
50 |
55 |
60 |
65 |
70 |
75 |
80 |
|
△η／％ |
25 |
22.5 |
20 |
17 |
14.3 |
12 |
10 |
8.5 |
7.2 |
6.0 |
5.0 |
4.0 |
3.2 |
|
ns |
90 |
100 |
110 |
220 |
230 |
240 |
250 |
260 |
270 |
280 |
290 |
300 |
320 |
|
△η／％ |
2.0 |
1.0 |
0.6 |
0.3 |
0.65 |
1.0 |
1.3 |
1.6 |
2.0 |
2.3 |
2.6 |
3.0 |
4.0 |
