保定市机械密封件厂

高压机械密封的要求

Requirements for high pressure mechanical seals

1.增大密封零件截面

1. enlarging the section of sealing parts

对转动零件的截面要加大，静环也相应有较大的截面，不要在静环外径上有台阶或开槽.但要注意，随着密封面宽度b的增加，热变形和磨损也随之增加，同样要增加压盖的厚度以防变形和能承受压力.使用重载荷弹簧，使用较大直径的销子以适应较大的启动扭矩。

The cross section of the rotating parts should be increased, and the static ring has a larger section. Do not have steps or slotting on the outer diameter of the static ring. However, as the width of the seal is increased, the thermal deformation and wear will increase with the increase of the width b of the seal. The diameter of the pin is adapted to the larger starting torque.

2.提高密封零件的加工精度

2. improve the machining accuracy of sealed parts

(1)压盖底部装静环的幢孔面要保证高的平直度，因为在高压下，任何表面上的高出点会传给静环而引起泄漏;

(1) to ensure the high flatness of the hole surface with the static ring on the bottom of the gland, because at high pressure, the high point on any surface will pass to the static ring and cause leakage.

(2)提高密封面内外径和宽度的加工精度，因为在高压时，，密封内外径和宽度的精度对比压的变化有明显的影响.密封端面研磨、.抛光后的粗糙度为Ra0.05~0.025(▽12~▽13)，平直度必须限制在1个光带以内.此外，摩擦端面的垂直度和轴的精度也要相应提高。

(2) improve the machining accuracy of the inside and outside diameter and width of the seal, because in high pressure, the accuracy of the inner and outer diameter and width of the seal has an obvious effect on the change of the pressure. The surface of the seal is lapping, the roughness after polishing is Ra0.05~0.025 (12~), and the flatness must be limited to 1 light belts. The precision of the shaft should also be improved accordingly.

注意在高压下因不同介质所造成的冲刷腐蚀和磨损，图10-12 (a),  (b)表示不同摩擦副材料在不同的转速下介质为烃和水及水溶液时压力与密封尺寸的关系。

Attention is paid to the erosion and abrasion caused by different media at high pressure. Figure 10-12 (a), B indicates the relationship between pressure and seal size of different friction materials at different rotational speeds when the medium is hydrocarbon and water and water.

5、采用流体动压式机械密封

5. Using fluid dynamic mechanical seal

流体动压式(也称流体动力式，热流体动压式)机械密封是考虑在高压和摩擦热的情况下，密封缝隙中的润滑膜稳定性而研制成的新型密封面结构，图10-13(a), (b)是热流体动几式机械密封槽的布置图，这种结构类似形式很多(见图4-8)，它的热流体动力效应是在密封上形成，在密封环旋转的时候，槽能使液体强烈地冷却距它较远的密封表面。进行这种冷却时，在密封环的初始表面上形成与槽数相等的流体动力楔和高压区.由于切向流和压力降，在每一个槽后形成慧星状润滑楔(图10-14).因此，随着密面上载荷与滑动速度的增加，摩擦系数反而减小(图10-15).

Fluid dynamic pressure (also known as fluid power, hot fluid dynamic pressure) mechanical seal is a new type of sealing surface, which considers the stability of the lubricating film in the sealing gap under high pressure and friction heat. Figure 10-13 (a), (b) is the layout of a few types of mechanical seal grooves in the heat flow body. This structure is similar in many similar forms (see Figure 4-8). Its thermo hydrodynamic effect is formed on the seal. When the sealing ring rotates, the tank can make the liquid cool the sealing surface far away from it. For this kind of cooling, a fluid dynamic wedge and a high pressure area are formed on the initial surface of the seal ring. The comet shaped lubricating wedge (Figure 10-14) is formed after each slot due to the tangential flow and pressure drop (Figure 10-14). As a result, the friction coefficient decreases with the increase of the load and sliding velocity on the dense surface (Figure 10-15).

二、布格曼公司HSHF型高压机械密封介绍

Two, Bugman HSHF high pressure mechanical seal introduction.

芳烃装置加料泵液力透平GAT-101A，功率968kW，转速6748r/ min，输送介质为烃类，使用温度43~39度，进口压力15.33MPa，出口压力1.9Mpa，机械密封是布格曼公司HSHF型高压密封，其定型产品为单端面、流体动压式带泵效螺旋的结构.原工作参数P = 5(14) MPa, t = 300'C , V < 50 m / s,因单端面密封结构不能满足使用要求，所以采用双端面结构，由一个动环对两个静环，结构比较紧凑，它是筒形结构，安装比较方便之(图10-16)。

Aromatics feed pump hydraulic turbine GAT-101A, power 968kW, speed 6748r/ min, transport medium is hydrocarbon, use temperature 43~39 degree, import pressure 15.33MPa, export pressure 1.9Mpa, mechanical seal is a HSHF type high pressure seal of barger company, its finalized product is a single end, flow body dynamic pressure belt pump efficiency spiral structure. Parameters P = 5 (14) MPa, t = 300'C, V < 50 m / s, because the single end seal structure can not meet the requirements of use, so using a double end structure, a dynamic ring to two static rings, the structure is compact, it is a cylindrical structure, installation is more convenient (Figure 10-16).

用于液力透平进口端密封是HSHF D3/95规格，泵效套(6A)是右螺旋，泵效外壳(16A)是左螺旋;用于出口端密封是HSHF D4/95规格，泵效套(6B)是左螺旋，泵效外壳(16B)是右螺旋.因此，这两套密封与旋转方向有关，进出口端不能装错，泵效套也不能互换。

For the hydraulic turbine inlet seal is HSHF D3/95 specification, the pump effect sleeve (6A) is the right spiral, the pump effect shell (16A) is the left helix; for the outlet seal is HSHF D4/95 specification, the pump effect sleeve (6B) is the left spiral, the pump effect shell (16B) is the right spiral. Therefore, the two seals are related to the rotation direction, the inlet and outlet end can not be misplaced, pump effect sleeve It can't be interchangeable.