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Aerzener seals are devices that prevent fluid leakage, consisting of at least one pair of end faces perpendicular to the axis of rotation. These faces remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with the assistance of auxiliary seals. Mechanical seals where the elastic loading mechanism and auxiliary seal are metal bellows are referred to as metal bellows seals. In light-duty seals, rubber bellows are sometimes used as auxiliary seals; however, since the elastic force of rubber bellows is limited, springs are generally required to supplement the loading force. Mechanical seals are commonly abbreviated as "mech seals".

Aerzener seals introduction

A mechanical seal is a shaft sealing device for rotating machinery, such as centrifugal pumps, centrifuges, reaction vessels, and compressors. Since the drive shaft passes through the interior and exterior of the equipment, there is a circumferential gap between the shaft and the equipment. The medium inside the equipment leaks outward through this gap. If the pressure inside the equipment is lower than atmospheric pressure, air leaks into the equipment. Therefore, a shaft sealing device is required to prevent leakage. There are many types of shaft seals. Due to advantages such as low leakage and long service life, mechanical seals are the primary shaft sealing method for these equipment worldwide. Mechanical seals are also called face seals. National standards define them as: "a device that prevents fluid leakage, constituted by at least one pair of end faces perpendicular to the axis of rotation, which remain in contact and slide relative to each other under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism, along with the assistance of auxiliary seals."

Aerzener seals structural composition

1) Main components: rotating ring, stationary ring, cooling device, and compression spring (depending on the specific equipment). 2) Auxiliary sealing elements: sealing rings (including O-shape, X-shape, U-type, wedge shape, rectangular flexible graphite, PTFE-covered rubber O rings, etc.). 3) Elastic compensation mechanism: springs, thrust rings, spring seats, keys, or various screws. 4) Classification: divided into single-face and double-face; balanced and unbalanced; arbitrary rotation direction and fixed rotation direction.

Aerzener seals installation precautions

1) During installation, pay close attention to avoiding installation deviations. Tighten the gland after aligning the coupling. Bolts should be tightened evenly to prevent tilting of the gland face. Check all points with a feeler gauge; the error must not exceed 0.05 mm. Check the mating clearance (i.e., concentricity) between the gland and the outer diameter of the shaft or shaft sleeve. It must be uniform around the circumference. Check all points with a feeler gauge; the permissible error must not exceed 0.01 mm. 2) The spring compression amount must be performed according to regulations. Excessive or insufficient compression is not allowed. The required error is 2.00 mm. Excessive compression increases the specific face pressure, accelerating face wear. Insufficient compression results in inadequate specific pressure, failing to achieve sealing. 3) After installing the rotating ring, it should automatically spring back when pressed against the spring. 4) Installation position requirements: To ensure stable operation, long service life, and low leakage performance of the mechanical seal, correct installation on the machine is crucial. When installing the mechanical seal on the machine, compare it carefully with the general assembly drawing before installation to confirm that all parts are ready. At this time, check for abnormalities such as scratches or damage on the sealing friction pair faces and sealing rings. Also, check for scratches on the surfaces of the shaft or shaft sleeve contacting the packing and sealing rings (O rings), as well as on components such as flanges. If any abnormalities are found, they must be replaced or repaired before use. During actual installation, do not bring more parts to the site than needed. If there are leftover parts after installation, it indicates missing installations. If parts are insufficient, it means parts were assembled in unnecessary places, thereby serving as a self-check during installation.

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