Hydraulic machinery tells you several misunderstandings in the use of centrifugal heat transfer oil

　　Hydraulic machinery tells you several misunderstandings in the use of centrifugal heat transfer oil pump mechanical seals

　　1. Centrifugal heat transfer oil pump (Deep well pump) mechanical seal spring (Spring) (huáng) the greater the compression, the better the sealing effect. In fact, too much spring compression can cause rapid wear of the friction pair (a basic type of component failure) and instantaneous burnout; excessive compression makes the spring lose the ability to adjust the end face of the moving ring, resulting in seal failure.

　　2. The tighter the seal diagram of the mechanical seal of the centrifugal heat transfer oil pump, the better. In fact, if the moving ring seal is too tight, it is harmful and useless. One is to aggravate the wear between the sealing ring and the shaft sleeve, and to leak prematurely; the second is to increase the resistance of the axial adjustment and movement of the moving ring, which cannot be adjusted in time when the working conditions change frequently (frequency); the third is the spring. (Huáng) Excessive fatigue is easy to damage; the fourth is to deform the moving ring sealing ring, which affects the sealing effect.

　　3. The tighter the static ring seal of the thermal oil pump (Deep well pump), the better. The static ring seal is basically in a static state, and the sealing effect will be better if it is relatively tight, but too tight is also harmful. The first is that the static ring seal is excessively deformed and affects the sealing effect; the second is that the static ring is mostly made of graphite (chemical formula C), which is generally brittle, and excessive force can easily cause rupture; third, it is difficult to install and disassemble (difficult ), the static ring is easily damaged.

　　4. Deep well pump impeller (referring to the wheel disc equipped with moving blades) lock nut is as tight as possible. In mechanical seal leakage, the leakage between the sleeve and the shaft (inter-shaft leakage) is relatively common. It is generally believed that the leakage between the shafts means that the impeller lock nut is not locked. In fact, there are many factors that cause leakage between the shafts, such as the failure of the shaft pads, offset, impurities in the shafts, and the matching between the shaft and the sleeve. Large shape and position deviation, vandalism of the contact surface, gaps between various parts on the shaft, and excessively long shaft head threads will cause leakage between the shafts. Over-locking of the lock nut will only cause premature failure of the inter-axis pad. On the contrary, properly lock the lock nut so that the inter-axis pad always maintains a certain compression elasticity. During operation, the lock nut will be automatically locked in time, so that the shafts are always in good condition. The sealed state.

　　5. The new deep well pump is better than the old one. The hydraulic wrench transmits power to the working head through the high-pressure oil pipe and the hydraulic pump, which drives the working head to tighten or loosen the nut. The hydraulic pump can be driven by electricity or compressed air. The working head of the hydraulic wrench is mainly composed of three parts, the frame (also called the shell), the oil cylinder and the transmission parts. The output force of the oil cylinder, the piston rod of the oil cylinder and the transmission part form a motion pair. The distance from the center of the oil cylinder to the center of the transmission component is the hydraulic wrench amplification arm. The oil cylinder output multiplied by the arm is the theoretical output torque of the hydraulic wrench. The actual output torque is smaller than the theoretical output torque. Relatively speaking, the effect of using the new mechanical seal is better than the old one, but the quality or material quality of the new mechanical seal (xuanze) is improper, and the large size error will affect the sealing effect; in terms of polymerization and permeability (Osmosis) In the medium, if the static ring is not excessively worn (a basic type of component failure), it is better not to replace it. Because the static ring stays in a static state for a long time in the static ring seat, the polymer and the impurity deposition (sedimentation) are integrated, which has a better sealing effect.

　　6. It is better to dismantle the deep well pump than not to dismantle it. Once the mechanical seal leaks, it is eager to dismantle and repair. In fact, sometimes the seal is not damaged, and the leakage can be eliminated by adjusting the working conditions or properly adjusting the seal. This not only avoids waste but also verifies (Experimental) one's own fault judgment ability, accumulates maintenance experience (experience) to improve the quality of maintenance.

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