AF泡沫泵的軸承擋油環(huán)設計
擋油環(huán)設計如圖7-25所示。擋油環(huán)替代迷宮環(huán)、擋油圈和止油擋環(huán)等。這里介紹的是滑動軸承用的擋油環(huán)。
1)材料: ZCuAl10Fe3、ZCuSn5Pb5Zn5等防火花材料。有時也用鑄鐵，但一般用于低檔泵。
2)擋油環(huán)與軸承體配合為大外徑，應大于或等于軸瓦外徑，通常是等于軸瓦外徑，以便于加工裝軸瓦配合的孔。它與軸承體的公差配合同軸瓦與軸承體的配合，即H7/js6或H7/j6。軸瓦與軸承體的配合也可以采用H7/h6(非強制潤滑用)。但為了防止擋油環(huán)下部漏油，裝配時要涂密封膠，其與軸配合為軸直徑+0.2~0. 3mm (H8/e6, e6--與軸襯配合的軸公差)。
3)擋油環(huán)與軸承體常用軸向定位為榫槽定位(見圖7-25a、 b、d、e)，用普通圓柱銷或彈性圓柱銷防轉(zhuǎn)。
4)擋油環(huán)與軸的密封一般用溝槽形式，其內(nèi)徑最下部有回油槽或回油孔。由于鉆孔較小，一般有2或3個回油孔。
5)榫槽寬度不論是公止口還是母止口配合都為H8/18。

6)擋油環(huán)般是分半的，也可以不是分半的。
7)安裝時，其下部與軸承體要涂密封膠，特別是油面離擋油環(huán)下部太近或其外徑間隙配合時更要如此，主要是防漏油AF泡沫泵。

Design of bearing oil retaining ring for AF foam pump

The oil retaining ring design is shown in Fig. 7-25. Oil retaining rings replace labyrinth rings, oil retaining rings and oil retaining rings. The oil retaining ring for sliding bearing is introduced here.

1) Materials: ZCuAl10Fe3, ZCuSn5Pb5Zn5 and other fire-proof materials. Cast iron is sometimes used, but is generally used for low-grade pumps.

2) The oil retaining ring and the bearing body are fitted with a large outer diameter, which should be greater than or equal to the outer diameter of the bearing bush, usually equal to the outer diameter of the bearing bush, so as to facilitate the processing of the holes matching the bearing bush. It matches the tolerance of bearing body with coaxial Bush and bearing body, namely H7/js6 or H7/j6. H7/h6 (non-compulsory lubrication) can also be used for the matching of bearing bush and bearing body. However, in order to prevent oil leakage at the lower part of the oil retaining ring, sealant should be applied when assembling. The diameter of the shaft with sealant is + 0.2-0.3 mm (H8/e6, E6 - the tolerance of the shaft with the bushing).

3) The commonly used axial positioning of oil retaining ring and bearing body is mortise groove positioning (see Fig. 7-25a, b, d, e), which is rotated by common cylindrical pin or elastic cylindrical pin.

4) The seal of the oil retaining ring and shaft is usually grooved, and the bottom of the inner diameter is the oil return groove or the oil return hole. Owing to the small boreholes, there are usually 2 or 3 oil return holes.

5) The width of mortise groove is H8/18 whether it is fit for stop or mother stop.

6) Oil retaining rings are generally divided, or not.

7) when installing, the lower part and the bearing body should be coated with sealant, especially when the oil surface is too close to the bottom of the oil retaining ring or when the outer diameter clearance fits. The main thing is to prevent leakage of oil AF foam pump.