The oil mist lubrication system generally includes an oil mist host, an oil mist delivery main pipe, a drop pipe at the lubricated equipment, an oil mist distributor, an oil mist nozzle, an oil mist supply pipe, and an oil mist emission collection main unit. components, oil mist discharge pipes, residual oil collection tanks, ferrule joints, etc. Under special circumstances, there are also purge type oil mist discharge assemblies and purge type oil level observation assemblies.
(1) Oil mist generation and control part
The atomization of oil mist adopts a vortex mist process, which is highly efficient and anti-blocking; the control of oil mist is A microprocessor unit; this section also includes storage tanks, conveying equipment and heating equipment.
(2) The connection between the oil mist transportation and distribution part from the main controller to each oil injection point is the oil mist transportation pipe to the distributor, and then to the oil injection point through the nozzle. The pipe fittings are composed of main pipes and branch pipes made of clean materials. The upper branch pipe of the oil mist distributor is connected to the oil injection point of a pump to distribute the atomized oil to the lubrication point. Each distributor can supply six lubrication points.
(3) The oil mist throttle can measure and adjust the amount of atomized oil delivered to the lubrication point, and can also convert dry atomized oil into wet atomized oil. In addition to the "atomized" type, you can also choose the injection type, compression type or directional type, each requiring a throttle at each lubrication point.
(4) Atomized oil collection container This device is used to collect condensed oil discharged from the bearing box. It is usually also part of the oil collector of another oil recovery system and can be used to arrange the reuse of recovered oil.
The working principle of oil mist lubrication:
Oil mist generation: After the compressed air enters the valve body 1 through the air inlet, it enters the inner cavity of the nozzle along the air inlet hole of the nozzle 3, and It is sprayed from the venturi 4 into the atomization chamber 5. At this time, a negative pressure is generated in the vacuum chamber 2, and the lubricating oil enters the vacuum chamber 2 through the oil filter 8 and the fuel injection pipe 7, and then drips into the venturi 4 , the oil droplets are sprayed into uneven oil particles by the airflow, and then enter the upper part of the oil reservoir 9 from the mist discharge hole of the spray cover 6. The large oil particles fall back to the oil in the lower part of the oil reservoir 9 under the action of gravity. , only particles smaller than 3 μm remain in the gas to form oil mist, which is transported to the lubrication point through the pipeline with the compressed air.
In order to deliver lubricating oil to friction points, the lubricating oil must first be atomized very finely in a lubricating oil atomizing device. The surface tension of atomized lubricant particles is greater than the attraction force of lubricant particles. As a result, the finely atomized lubricating oil is brought into a state close to a gaseous state. The atomized lubricating oil can be delivered to various friction points by the atomizing device through the distributor in this state. However, since the oil mist cannot produce the oil film required for lubrication after entering the lubrication point, corresponding condensation nozzles must be installed at the lubrication points according to different working conditions, so that the oil mist forms drop-shaped oil particles after passing through the condensation nozzle.
It is impossible for an oil mist lubrication device to completely restore the atomized lubricating oil into drop-shaped oil particles. In the early oil mist lubrication devices, only 60 to 75% of the oil droplets reached the lubrication point, and the remaining lubrication The oil enters the atmosphere in the form of mist. After subsequent improvements, the utilization rate of lubricating oil can reach 90%, but a small amount of lubricating oil still enters the atmosphere in the form of mist, polluting the environment. In addition, the oil mist can only be transported at a small speed because the oil mist can only remain stable under laminar flow conditions. If it is a turbulent flow state, the lubricating oil particles will gather together due to mutual collision and combine into larger lubricating oil droplets, so that they return to the liquid state. In this liquid state, the lubricating oil will flow back into the container. Since the pressure of the oil mist is very low, in order to overcome the resistance when the oil mist flows, a pipeline with a relatively large cross-sectional area must be used.
It is also well known that the lubricating medium is delivered to the lubrication point in a turbulent air flow. However, with this method problems arise in the distribution of the drop-like lubricating medium brought in by the air flow to the individual lubrication points. At the bifurcation point, gravity takes effect, causing a larger portion of the lubricant droplets to settle to the lowermost base of the dispenser. In this way, the distribution of lubricant is position-dependent. Someone once did such an experiment and put a dispenser with moving parts into use. But these experiments yielded no practical results. Later, someone else proposed the idea of ??creating a special air vortex in the distributor. But since the viscosity of the lubricating medium fluctuates within a considerable range, this suggestion ultimately went nowhere.
Considering that lubricating oils cannot be hydrodynamically calculated due to their different viscosities, and that the ratio of air volume to lubricating oil volume also varies according to need, the installation position plays a very important role. As a result, in the case of lubrication using an oil-air mixture brought in by a turbulent air flow, a specific amount of lubricating oil is usually allocated to each friction point according to the size of the air flow.
In the oil mist lubrication pipeline, the oil has become mist and merged with the compressed air. The transport speed of oil and gas in the pipeline is the same. Therefore, the air discharged from the lubricated part contains oil. Tiny particles can pollute the environment and seriously endanger human health.