Pусский
Let’s take a look at the case of a certain plant’s mechanical accident of the double-supported centrifugal pump: the mechanical seal at the non-drive end leaked and repaired, the half-string adjusting pad was 2.6mm, since the accessories were messy & all about, the adjusting pad fell into the sewer,During the installation, the adjustment pad was missing, and no obvious problems were found in the cranking. After the pump was opened, the non-drive end pump cover and the rear end face of the impeller were locked, resulting in overhaul and some parts were updated.
Let's talk about the method of measuring the compression amount of the mechanical seal of the double-supported centrifugal pump.
Step 1: Measure the distance from the contact surface of the bearing housing of the mechanical Seal and the end surface of the bearing sheath of the mechanical seal.
a.Use a depth gauge to measure from the contact plane of the bearing housing of the mechanical seal and the gland to the contact plane of the bearing housing and the end surface of the bearing sheath of the mechnaical seal (for example; the distance is 109.4mm minus the thickness of the vernier caliper 4mm = 105.4mm).
b.Use a vernier caliper to measure from the contact plane of the bearing and the gland of the mechanical seal to the contact plane of the bearing box and the suspension of the mechanical seal (for example: the distance is 115mm minus the thickness of the depth gauge 5mm=110mm).
The value a 105.4mm minus the value b 110mm = the distance between the contact surface of the bearing box and the suspension of the mechanical seal to the contact surface of the bearing box and the end faces of the bearing sheath of the mechanical seal is 4.6mm.
a.Use a depth gauge to measure from the contact plane of the bearing housing of the mechanical seal and the gland to the contact plane of the bearing housing and the end surface of the bearing sheath of the mechnaical seal (for example; the distance is 109.4mm minus the thickness of the vernier caliper 4mm = 105.4mm).
b.Use a vernier caliper to measure from the contact plane of the bearing and the gland of the mechanical seal to the contact plane of the bearing box and the suspension of the mechanical seal (for example: the distance is 115mm minus the thickness of the depth gauge 5mm=110mm).
The value a 105.4mm minus the value b 110mm = the distance between the contact surface of the bearing box and the suspension of the mechanical seal to the contact surface of the bearing box and the end faces of the bearing sheath of the mechanical seal is 4.6mm.
Step 2: install the shaft sleeve and the rotary face of the mechanical seal on the shaft, (the purpose of installing the shaft sleeve first is to prevent the shaft position from being changed by the thrust of the shaft sleeve after adjusting the shaft position, which is doing useless work, and after which repeated adjustments should be made again. )
（To be continued）
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