Research on Water Lubrication Seal of Single Screw Air Compressor

As mentioned in the article, the link between oil and gas in the power transmission chain is the key to determining the purity of compressed air. Because this ring is in the power transmission chain, the sealing form in this link is the most A brain-breaking dynamic seal.

Of course, in different types of oil-free compressed air mechanisms, the focus of the dynamic seal is not the same. In analyzing the key points of the dynamic sealing prevention and control of the water-lubricated single-screw air compressor, we noticed that the water is compressed in the air compression chamber, and the bearing is lubricated with grease. At the same time, the water inlet is at a negative pressure in the air chamber and the exhaust end is at a high pressure, and the bearing chamber is at a normal pressure. Therefore, the oil mist which may be liquefied or vaporized in the bearing cavity may cause contamination of the lubricating water and the compressed air; however, there is also the possibility that the lubricating water in the compressed air chamber may invade the bearing and the grease, so the main function of the dynamic seal It is to prevent them from causing harm to each other.

3. Deep groove ball bearing for star wheel 4. Double row radial thrust ball bearing for worm 5. Worm 6. Bearing distribution of single-screw air compressor with deep groove ball bearing for worm 3.2 Design study of water-lubricated dynamic seal 3.2.1 The spatial position design of water-lubricated dynamic seals Due to the lubrication method, especially the change of lubricant, the design work of water-lubricated dynamic seals faces many difficulties. The most direct problem is the use of space in the compressed air chamber. The water-lubricated single-screw air compressor has evolved on the basis of the injection lubrication model, and the single-screw mainframe structure cannot be changed. Therefore, compared with the original structure, only the single spindle power transmission is extended at the end of the end face. The water-lubricated model is to be sealed in the axial direction of the space at 6 positions and the oil seal is applied at the 6 bearing positions. The space tolerance is indeed limited. It can be seen that the position design of the spindle end face sealing device has penetrated into the physical interior of the worm, and the use of space has been extremely sufficient.

3.2.2 Structural design of water-lubricated dynamic seal The main shaft end seal of the oil-injected single-screw air compressor is only a simple anti-leakage, and even if there is a small amount of leakage, the leakage is already under normal pressure, and the negative pressure through the suction port The effect is easy to return the spill to the original working environment, so a face seal with the simplest construction of the repair type can be used.

The requirements for water-lubricated single-screw air-pressure motorized sealing functions are much stricter, as the leakage here will pose a threat to the operation of the bearings. In particular, the high-pressure end of the main shaft has a certain pressure on the leakage, and the possibility of damage is more serious. This requires careful design of the structural design of the water-lubricated dynamic seal. Therefore, the structural form of the water-lubricated dynamic seal has undergone a major change with respect to the fuel injection type, and has been carefully designed and laid out.

The main content of the dynamic sealing device for the utilization of the worm body structure is as follows: 3 The main purpose of the water-lubricated axial end face seal is to prevent the lubrication water from leaking to the bearing position. Therefore, the end face seal design should select the lubrication water leakage direction. The opposite direction to the rotating centrifugal force; the compensation mechanism in the Q water-lubricated axial end face sealing device adopts a multi-spring structure with uniform spring pressure distribution to ensure reliable sealing under higher speed conditions; Q is to avoid the multi-spring end face sealing mechanism In the water-lubricated end face seal device, the structure in which the spring is placed inside the static ring is selected; 3.2.3 Water-lubricated dynamic seal cooling design Normally, the friction device of the sealing device It is lubricated and cooled by a sealed medium, so end face seals rarely have a separate cooling system. However, the dynamic seal of a water-lubricated single-screw air compressor, as already mentioned, is not an isolated point seal, but a multi-point system in different locations in space. These sealing locations are very spatially dispersed, so they have a very large difference in the probability of obtaining a lubricant and the amount of lubricant obtained. In particular, the friction pair is not able to continuously obtain medium lubrication and cooling in time, and will fail in a very short time. To this end, a cooling network must be designed for the dynamic sealing system of a water-lubricated single-screw air compressor to ensure continuous lubrication and cooling of the fluid at each point of the dynamic seal.

The structure of the lubrication cooling system designed for the water-lubricated single-screw air compressor is only the square of the lubrication and cooling medium obtained by the friction pair at a certain point.

4 Leakage Conductor The dynamic seal mentioned in this paper refers to the end face seal mode adopted by the three axial end directions of the lubricating oil in the air chamber and the oil seal mode adopted by the three shaft end positions on the bearing.

The three shafts and six shaft ends 12 are dynamically sealed, including six end seals and six oil seals, each of which forms a face-to-face space between the seal and the oil seal. Here, we will focus on the problems that occur in these face-to-face spaces and the solutions we should take.

The problems that occur in these face-to-face spaces are caused by leaks in the seal. No matter how good the seal design device, absolutely no leakage can not be done, the only thing that can be done is to take the most effective methods and measures to reduce or eliminate leakage (turn down page 118) motor power 75 2.9 method The prospect of Lanzhou-driven air compressor unit is wide. 3 In the planned economy period of China, it is extremely difficult for the compressor factory to support the special motor. In foreign countries, the compressor factory under the same company can easily be equipped with a special motor for the motor factory. Now, the socialist market economy has opened up the difficulties of supporting.

Q foreign flange motor driven air compressor, the maximum power has reached 400kW. This shows that the air compressor with wide gas volume and pressure range has the technical and economic feasibility of equipped with flange motor.

Q domestic individual reciprocating piston compressor manufacturers have been the first to actively cooperate with the motor factory, and successively introduced medium and high pressure oil-free air compressors driven by flange motors and oil-free air compressors for power.

0 For the motor factory, it is conditional that the cost of the flange motor is equivalent to the standard motor of the same power and the same speed, or lower.

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