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Fully sealed and combined seal
(1) The backup seal is in which the main seal is working and the sub-sealing is in the standby state. There are non-contact temporary seals and contact wear seals in the spare seal. When the former is in the main seal operation, the spare seal is temporarily placed, which is a non-contact seal. Once the main seal is damaged, the backup seal serves as a backup safety function while the alarm is issued. The latter is always in contact, and the backup seal is replaced when the main seal is damaged.
(2) Cascade sealing Two sets of seals work in series, the inner seal works, and the outer seal plays a safety role. John Crane has dry tandem seals (D-Tengem~als) and wet tandem seals. The former uses a gas end face seal to proudly seal the latter. The latter uses a common liquid end face seal as a secondary seal.
(3) The seal that suppresses the seal on the side of the atmosphere is called suppressing the seal. It plays a role in safety and environmental protection: controlling the atmospheric side to escape to the atmosphere when the main seal fails, controlling the environment around the main seal; protecting the bearing Affected by backing or sealing leakage irrigation · Increase the safety of the device and the human body.
Combined seal
The mechanical seal can be combined with other seals to form a superior combination seal that is superior to the former.
(1) mechanical seal - spiral seal, using a spiral seal as a front seal. Reverse transfer pressure, reduce mechanical seal load, often used for high viscosity oil pump seals.
(2) Mechanical seal - labyrinth spiral seal, using labyrinth spiral seal as pump stacking wheel and throttling device, and inverting to form a closed loop flushing circuit to improve the sealing environment and prolong the sealing life, such as heat pump sealing.
(3) Mechanical seal—The float ring seal has two forms: the float ring acts as an atmospheric side seal and acts as a blocking liquid seal I or a floating ring as a back cold water seal (suppressing the seal).
(4) Mechanical seal—soft packing seals the moving ring tank soft packing ring to form a combined seal. There are also other combinations of various mechanical seals. (Source: Hebei Innovation Sealing Material Co., Ltd.)
Gasket combination gasket toothed gasket metal wound gasket stainless steel gasket octagonal gasket metal wound gasket ladle pad stainless steel metal winding mat
Non-tapping screws are machine Screw, the pieceworker to be fastened must be tapped with taps in the screw hole in advance to match the screw threads.
The difference between tooth screws and other screws depends on whether they can be used together with nuts. Tooth screws can be used with nuts. And relative to the screws of other teeth, there are self-tapping screws. The nut of this kind of screw has no bow teeth. As for the standard teeth and fine teeth are only different pitch, it is the nut of the machine screw
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